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gstreamer/libs/gst/base/gstbasesink.c
Wim Taymans 124b8e38af basesink: call state change in all cases 
When we asynchronously go from READY to PLAYING, also call the
state change function so that subclasses can update their state for PLAYING.
Because the PREROLL lock is not recursive, we can't make this without
races and we must assume for now that the subclass can handle concurrent calls
to PAUSED->PLAYING and PLAYING->PAUSED. We can make this assumption because not
many elements actually do something in those state changes and the ones that
did would be broken even more without this change.

https://bugzilla.gnome.org/show_bug.cgi?id=702282
2013-06-17 10:36:34 +02:00

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/* GStreamer
* Copyright (C) 2005-2007 Wim Taymans <wim.taymans@gmail.com>
*
* gstbasesink.c: Base class for sink elements
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstbasesink
* @short_description: Base class for sink elements
* @see_also: #GstBaseTransform, #GstBaseSrc
*
* #GstBaseSink is the base class for sink elements in GStreamer, such as
* xvimagesink or filesink. It is a layer on top of #GstElement that provides a
* simplified interface to plugin writers. #GstBaseSink handles many details
* for you, for example: preroll, clock synchronization, state changes,
* activation in push or pull mode, and queries.
*
* In most cases, when writing sink elements, there is no need to implement
* class methods from #GstElement or to set functions on pads, because the
* #GstBaseSink infrastructure should be sufficient.
*
* #GstBaseSink provides support for exactly one sink pad, which should be
* named "sink". A sink implementation (subclass of #GstBaseSink) should
* install a pad template in its class_init function, like so:
* |[
* static void
* my_element_class_init (GstMyElementClass *klass)
* {
* GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
*
* // sinktemplate should be a #GstStaticPadTemplate with direction
* // #GST_PAD_SINK and name "sink"
* gst_element_class_add_pad_template (gstelement_class,
* gst_static_pad_template_get (&amp;sinktemplate));
*
* gst_element_class_set_static_metadata (gstelement_class,
* "Sink name",
* "Sink",
* "My Sink element",
* "The author &lt;my.sink@my.email&gt;");
* }
* ]|
*
* #GstBaseSink will handle the prerolling correctly. This means that it will
* return #GST_STATE_CHANGE_ASYNC from a state change to PAUSED until the first
* buffer arrives in this element. The base class will call the
* #GstBaseSinkClass.preroll() vmethod with this preroll buffer and will then
* commit the state change to the next asynchronously pending state.
*
* When the element is set to PLAYING, #GstBaseSink will synchronise on the
* clock using the times returned from #GstBaseSinkClass.get_times(). If this
* function returns #GST_CLOCK_TIME_NONE for the start time, no synchronisation
* will be done. Synchronisation can be disabled entirely by setting the object
* #GstBaseSink:sync property to %FALSE.
*
* After synchronisation the virtual method #GstBaseSinkClass.render() will be
* called. Subclasses should minimally implement this method.
*
* Subclasses that synchronise on the clock in the #GstBaseSinkClass.render()
* method are supported as well. These classes typically receive a buffer in
* the render method and can then potentially block on the clock while
* rendering. A typical example is an audiosink.
* These subclasses can use gst_base_sink_wait_preroll() to perform the
* blocking wait.
*
* Upon receiving the EOS event in the PLAYING state, #GstBaseSink will wait
* for the clock to reach the time indicated by the stop time of the last
* #GstBaseSinkClass.get_times() call before posting an EOS message. When the
* element receives EOS in PAUSED, preroll completes, the event is queued and an
* EOS message is posted when going to PLAYING.
*
* #GstBaseSink will internally use the #GST_EVENT_SEGMENT events to schedule
* synchronisation and clipping of buffers. Buffers that fall completely outside
* of the current segment are dropped. Buffers that fall partially in the
* segment are rendered (and prerolled). Subclasses should do any subbuffer
* clipping themselves when needed.
*
* #GstBaseSink will by default report the current playback position in
* #GST_FORMAT_TIME based on the current clock time and segment information.
* If no clock has been set on the element, the query will be forwarded
* upstream.
*
* The #GstBaseSinkClass.set_caps() function will be called when the subclass
* should configure itself to process a specific media type.
*
* The #GstBaseSinkClass.start() and #GstBaseSinkClass.stop() virtual methods
* will be called when resources should be allocated. Any
* #GstBaseSinkClass.preroll(), #GstBaseSinkClass.render() and
* #GstBaseSinkClass.set_caps() function will be called between the
* #GstBaseSinkClass.start() and #GstBaseSinkClass.stop() calls.
*
* The #GstBaseSinkClass.event() virtual method will be called when an event is
* received by #GstBaseSink. Normally this method should only be overriden by
* very specific elements (such as file sinks) which need to handle the
* newsegment event specially.
*
* The #GstBaseSinkClass.unlock() method is called when the elements should
* unblock any blocking operations they perform in the
* #GstBaseSinkClass.render() method. This is mostly useful when the
* #GstBaseSinkClass.render() method performs a blocking write on a file
* descriptor, for example.
*
* The #GstBaseSink:max-lateness property affects how the sink deals with
* buffers that arrive too late in the sink. A buffer arrives too late in the
* sink when the presentation time (as a combination of the last segment, buffer
* timestamp and element base_time) plus the duration is before the current
* time of the clock.
* If the frame is later than max-lateness, the sink will drop the buffer
* without calling the render method.
* This feature is disabled if sync is disabled, the
* #GstBaseSinkClass.get_times() method does not return a valid start time or
* max-lateness is set to -1 (the default).
* Subclasses can use gst_base_sink_set_max_lateness() to configure the
* max-lateness value.
*
* The #GstBaseSink:qos property will enable the quality-of-service features of
* the basesink which gather statistics about the real-time performance of the
* clock synchronisation. For each buffer received in the sink, statistics are
* gathered and a QOS event is sent upstream with these numbers. This
* information can then be used by upstream elements to reduce their processing
* rate, for example.
*
* The #GstBaseSink:async property can be used to instruct the sink to never
* perform an ASYNC state change. This feature is mostly usable when dealing
* with non-synchronized streams or sparse streams.
*
* Last reviewed on 2007-08-29 (0.10.15)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst_private.h>
#include "gstbasesink.h"
#include <gst/gst-i18n-lib.h>
GST_DEBUG_CATEGORY_STATIC (gst_base_sink_debug);
#define GST_CAT_DEFAULT gst_base_sink_debug
#define GST_BASE_SINK_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_SINK, GstBaseSinkPrivate))
#define GST_FLOW_STEP GST_FLOW_CUSTOM_ERROR
typedef struct
{
gboolean valid; /* if this info is valid */
guint32 seqnum; /* the seqnum of the STEP event */
GstFormat format; /* the format of the amount */
guint64 amount; /* the total amount of data to skip */
guint64 position; /* the position in the stepped data */
guint64 duration; /* the duration in time of the skipped data */
guint64 start; /* running_time of the start */
gdouble rate; /* rate of skipping */
gdouble start_rate; /* rate before skipping */
guint64 start_start; /* start position skipping */
guint64 start_stop; /* stop position skipping */
gboolean flush; /* if this was a flushing step */
gboolean intermediate; /* if this is an intermediate step */
gboolean need_preroll; /* if we need preroll after this step */
} GstStepInfo;
struct _GstBaseSinkPrivate
{
gint qos_enabled; /* ATOMIC */
gboolean async_enabled;
GstClockTimeDiff ts_offset;
GstClockTime render_delay;
/* start, stop of current buffer, stream time, used to report position */
GstClockTime current_sstart;
GstClockTime current_sstop;
/* start, stop and jitter of current buffer, running time */
GstClockTime current_rstart;
GstClockTime current_rstop;
GstClockTimeDiff current_jitter;
/* the running time of the previous buffer */
GstClockTime prev_rstart;
/* EOS sync time in running time */
GstClockTime eos_rtime;
/* last buffer that arrived in time, running time */
GstClockTime last_render_time;
/* when the last buffer left the sink, running time */
GstClockTime last_left;
/* running averages go here these are done on running time */
GstClockTime avg_pt;
GstClockTime avg_duration;
gdouble avg_rate;
GstClockTime avg_in_diff;
/* these are done on system time. avg_jitter and avg_render are
* compared to eachother to see if the rendering time takes a
* huge amount of the processing, If so we are flooded with
* buffers. */
GstClockTime last_left_systime;
GstClockTime avg_jitter;
GstClockTime start, stop;
GstClockTime avg_render;
/* number of rendered and dropped frames */
guint64 rendered;
guint64 dropped;
/* latency stuff */
GstClockTime latency;
/* if we already commited the state */
gboolean commited;
/* state change to playing ongoing */
gboolean to_playing;
/* when we received EOS */
gboolean received_eos;
/* when we are prerolled and able to report latency */
gboolean have_latency;
/* the last buffer we prerolled or rendered. Useful for making snapshots */
gint enable_last_sample; /* atomic */
GstBuffer *last_buffer;
GstCaps *last_caps;
/* negotiated caps */
GstCaps *caps;
/* blocksize for pulling */
guint blocksize;
gboolean discont;
/* seqnum of the stream */
guint32 seqnum;
gboolean call_preroll;
gboolean step_unlock;
/* we have a pending and a current step operation */
GstStepInfo current_step;
GstStepInfo pending_step;
/* Cached GstClockID */
GstClockID cached_clock_id;
/* for throttling and QoS */
GstClockTime earliest_in_time;
GstClockTime throttle_time;
/* for rate control */
guint64 max_bitrate;
GstClockTime rc_time;
GstClockTime rc_next;
gsize rc_accumulated;
};
#define DO_RUNNING_AVG(avg,val,size) (((val) + ((size)-1) * (avg)) / (size))
/* generic running average, this has a neutral window size */
#define UPDATE_RUNNING_AVG(avg,val) DO_RUNNING_AVG(avg,val,8)
/* the windows for these running averages are experimentally obtained.
* possitive values get averaged more while negative values use a small
* window so we can react faster to badness. */
#define UPDATE_RUNNING_AVG_P(avg,val) DO_RUNNING_AVG(avg,val,16)
#define UPDATE_RUNNING_AVG_N(avg,val) DO_RUNNING_AVG(avg,val,4)
/* BaseSink properties */
#define DEFAULT_CAN_ACTIVATE_PULL FALSE /* fixme: enable me */
#define DEFAULT_CAN_ACTIVATE_PUSH TRUE
#define DEFAULT_SYNC TRUE
#define DEFAULT_MAX_LATENESS -1
#define DEFAULT_QOS FALSE
#define DEFAULT_ASYNC TRUE
#define DEFAULT_TS_OFFSET 0
#define DEFAULT_BLOCKSIZE 4096
#define DEFAULT_RENDER_DELAY 0
#define DEFAULT_ENABLE_LAST_SAMPLE TRUE
#define DEFAULT_THROTTLE_TIME 0
#define DEFAULT_MAX_BITRATE 0
enum
{
PROP_0,
PROP_SYNC,
PROP_MAX_LATENESS,
PROP_QOS,
PROP_ASYNC,
PROP_TS_OFFSET,
PROP_ENABLE_LAST_SAMPLE,
PROP_LAST_SAMPLE,
PROP_BLOCKSIZE,
PROP_RENDER_DELAY,
PROP_THROTTLE_TIME,
PROP_MAX_BITRATE,
PROP_LAST
};
static GstElementClass *parent_class = NULL;
static void gst_base_sink_class_init (GstBaseSinkClass * klass);
static void gst_base_sink_init (GstBaseSink * trans, gpointer g_class);
static void gst_base_sink_finalize (GObject * object);
GType
gst_base_sink_get_type (void)
{
static volatile gsize base_sink_type = 0;
if (g_once_init_enter (&base_sink_type)) {
GType _type;
static const GTypeInfo base_sink_info = {
sizeof (GstBaseSinkClass),
NULL,
NULL,
(GClassInitFunc) gst_base_sink_class_init,
NULL,
NULL,
sizeof (GstBaseSink),
0,
(GInstanceInitFunc) gst_base_sink_init,
};
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseSink", &base_sink_info, G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&base_sink_type, _type);
}
return base_sink_type;
}
static void gst_base_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_sink_send_event (GstElement * element,
GstEvent * event);
static gboolean default_element_query (GstElement * element, GstQuery * query);
static GstCaps *gst_base_sink_default_get_caps (GstBaseSink * sink,
GstCaps * caps);
static gboolean gst_base_sink_default_set_caps (GstBaseSink * sink,
GstCaps * caps);
static void gst_base_sink_default_get_times (GstBaseSink * basesink,
GstBuffer * buffer, GstClockTime * start, GstClockTime * end);
static gboolean gst_base_sink_set_flushing (GstBaseSink * basesink,
GstPad * pad, gboolean flushing);
static gboolean gst_base_sink_default_activate_pull (GstBaseSink * basesink,
gboolean active);
static gboolean gst_base_sink_default_do_seek (GstBaseSink * sink,
GstSegment * segment);
static gboolean gst_base_sink_default_prepare_seek_segment (GstBaseSink * sink,
GstEvent * event, GstSegment * segment);
static GstStateChangeReturn gst_base_sink_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_base_sink_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstFlowReturn gst_base_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstFlowReturn gst_base_sink_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * list);
static void gst_base_sink_loop (GstPad * pad);
static gboolean gst_base_sink_pad_activate (GstPad * pad, GstObject * parent);
static gboolean gst_base_sink_pad_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static gboolean gst_base_sink_default_event (GstBaseSink * basesink,
GstEvent * event);
static GstFlowReturn gst_base_sink_default_wait_event (GstBaseSink * basesink,
GstEvent * event);
static gboolean gst_base_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_base_sink_default_query (GstBaseSink * sink,
GstQuery * query);
static gboolean gst_base_sink_negotiate_pull (GstBaseSink * basesink);
static GstCaps *gst_base_sink_default_fixate (GstBaseSink * bsink,
GstCaps * caps);
static GstCaps *gst_base_sink_fixate (GstBaseSink * bsink, GstCaps * caps);
/* check if an object was too late */
static gboolean gst_base_sink_is_too_late (GstBaseSink * basesink,
GstMiniObject * obj, GstClockTime rstart, GstClockTime rstop,
GstClockReturn status, GstClockTimeDiff jitter, gboolean render);
static void
gst_base_sink_class_init (GstBaseSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_base_sink_debug, "basesink", 0,
"basesink element");
g_type_class_add_private (klass, sizeof (GstBaseSinkPrivate));
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_base_sink_finalize;
gobject_class->set_property = gst_base_sink_set_property;
gobject_class->get_property = gst_base_sink_get_property;
g_object_class_install_property (gobject_class, PROP_SYNC,
g_param_spec_boolean ("sync", "Sync", "Sync on the clock", DEFAULT_SYNC,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_LATENESS,
g_param_spec_int64 ("max-lateness", "Max Lateness",
"Maximum number of nanoseconds that a buffer can be late before it "
"is dropped (-1 unlimited)", -1, G_MAXINT64, DEFAULT_MAX_LATENESS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_QOS,
g_param_spec_boolean ("qos", "Qos",
"Generate Quality-of-Service events upstream", DEFAULT_QOS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:async:
*
* If set to #TRUE, the basesink will perform asynchronous state changes.
* When set to #FALSE, the sink will not signal the parent when it prerolls.
* Use this option when dealing with sparse streams or when synchronisation is
* not required.
*/
g_object_class_install_property (gobject_class, PROP_ASYNC,
g_param_spec_boolean ("async", "Async",
"Go asynchronously to PAUSED", DEFAULT_ASYNC,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:ts-offset:
*
* Controls the final synchronisation, a negative value will render the buffer
* earlier while a positive value delays playback. This property can be
* used to fix synchronisation in bad files.
*/
g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
g_param_spec_int64 ("ts-offset", "TS Offset",
"Timestamp offset in nanoseconds", G_MININT64, G_MAXINT64,
DEFAULT_TS_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:enable-last-sample:
*
* Enable the last-sample property. If FALSE, basesink doesn't keep a
* reference to the last buffer arrived and the last-sample property is always
* set to NULL. This can be useful if you need buffers to be released as soon
* as possible, eg. if you're using a buffer pool.
*/
g_object_class_install_property (gobject_class, PROP_ENABLE_LAST_SAMPLE,
g_param_spec_boolean ("enable-last-sample", "Enable Last Buffer",
"Enable the last-sample property", DEFAULT_ENABLE_LAST_SAMPLE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:last-sample:
*
* The last buffer that arrived in the sink and was used for preroll or for
* rendering. This property can be used to generate thumbnails. This property
* can be NULL when the sink has not yet received a bufer.
*/
g_object_class_install_property (gobject_class, PROP_LAST_SAMPLE,
g_param_spec_boxed ("last-sample", "Last Sample",
"The last sample received in the sink", GST_TYPE_SAMPLE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:blocksize:
*
* The amount of bytes to pull when operating in pull mode.
*/
/* FIXME 0.11: blocksize property should be int, otherwise min>max.. */
g_object_class_install_property (gobject_class, PROP_BLOCKSIZE,
g_param_spec_uint ("blocksize", "Block size",
"Size in bytes to pull per buffer (0 = default)", 0, G_MAXUINT,
DEFAULT_BLOCKSIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:render-delay:
*
* The additional delay between synchronisation and actual rendering of the
* media. This property will add additional latency to the device in order to
* make other sinks compensate for the delay.
*/
g_object_class_install_property (gobject_class, PROP_RENDER_DELAY,
g_param_spec_uint64 ("render-delay", "Render Delay",
"Additional render delay of the sink in nanoseconds", 0, G_MAXUINT64,
DEFAULT_RENDER_DELAY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:throttle-time:
*
* The time to insert between buffers. This property can be used to control
* the maximum amount of buffers per second to render. Setting this property
* to a value bigger than 0 will make the sink create THROTTLE QoS events.
*/
g_object_class_install_property (gobject_class, PROP_THROTTLE_TIME,
g_param_spec_uint64 ("throttle-time", "Throttle time",
"The time to keep between rendered buffers (0 = disabled)", 0,
G_MAXUINT64, DEFAULT_THROTTLE_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstBaseSink:max-bitrate:
*
* Control the maximum amount of bits that will be rendered per second.
* Setting this property to a value bigger than 0 will make the sink delay
* rendering of the buffers when it would exceed to max-bitrate.
*
* Since: 1.1.1
*/
g_object_class_install_property (gobject_class, PROP_MAX_BITRATE,
g_param_spec_uint64 ("max-bitrate", "Max Bitrate",
"The maximum bits per second to render (0 = disabled)", 0,
G_MAXUINT64, DEFAULT_MAX_BITRATE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_sink_change_state);
gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_sink_send_event);
gstelement_class->query = GST_DEBUG_FUNCPTR (default_element_query);
klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_sink_default_get_caps);
klass->set_caps = GST_DEBUG_FUNCPTR (gst_base_sink_default_set_caps);
klass->fixate = GST_DEBUG_FUNCPTR (gst_base_sink_default_fixate);
klass->activate_pull =
GST_DEBUG_FUNCPTR (gst_base_sink_default_activate_pull);
klass->get_times = GST_DEBUG_FUNCPTR (gst_base_sink_default_get_times);
klass->query = GST_DEBUG_FUNCPTR (gst_base_sink_default_query);
klass->event = GST_DEBUG_FUNCPTR (gst_base_sink_default_event);
klass->wait_event = GST_DEBUG_FUNCPTR (gst_base_sink_default_wait_event);
/* Registering debug symbols for function pointers */
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_fixate);
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_activate);
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_activate_mode);
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_event);
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_chain);
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_chain_list);
GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_sink_query);
}
static GstCaps *
gst_base_sink_query_caps (GstBaseSink * bsink, GstPad * pad, GstCaps * filter)
{
GstBaseSinkClass *bclass;
GstCaps *caps = NULL;
gboolean fixed;
bclass = GST_BASE_SINK_GET_CLASS (bsink);
fixed = GST_PAD_IS_FIXED_CAPS (pad);
if (fixed || bsink->pad_mode == GST_PAD_MODE_PULL) {
/* if we are operating in pull mode or fixed caps, we only accept the
* currently negotiated caps */
caps = gst_pad_get_current_caps (pad);
}
if (caps == NULL) {
if (bclass->get_caps)
caps = bclass->get_caps (bsink, filter);
if (caps == NULL) {
GstPadTemplate *pad_template;
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass),
"sink");
if (pad_template != NULL) {
caps = gst_pad_template_get_caps (pad_template);
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
}
}
}
return caps;
}
static GstCaps *
gst_base_sink_default_fixate (GstBaseSink * bsink, GstCaps * caps)
{
GST_DEBUG_OBJECT (bsink, "using default caps fixate function");
return gst_caps_fixate (caps);
}
static GstCaps *
gst_base_sink_fixate (GstBaseSink * bsink, GstCaps * caps)
{
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (bsink);
if (bclass->fixate)
caps = bclass->fixate (bsink, caps);
return caps;
}
static void
gst_base_sink_init (GstBaseSink * basesink, gpointer g_class)
{
GstPadTemplate *pad_template;
GstBaseSinkPrivate *priv;
basesink->priv = priv = GST_BASE_SINK_GET_PRIVATE (basesink);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
g_return_if_fail (pad_template != NULL);
basesink->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_activate_function (basesink->sinkpad, gst_base_sink_pad_activate);
gst_pad_set_activatemode_function (basesink->sinkpad,
gst_base_sink_pad_activate_mode);
gst_pad_set_query_function (basesink->sinkpad, gst_base_sink_sink_query);
gst_pad_set_event_function (basesink->sinkpad, gst_base_sink_event);
gst_pad_set_chain_function (basesink->sinkpad, gst_base_sink_chain);
gst_pad_set_chain_list_function (basesink->sinkpad, gst_base_sink_chain_list);
gst_element_add_pad (GST_ELEMENT_CAST (basesink), basesink->sinkpad);
basesink->pad_mode = GST_PAD_MODE_NONE;
g_mutex_init (&basesink->preroll_lock);
g_cond_init (&basesink->preroll_cond);
priv->have_latency = FALSE;
basesink->can_activate_push = DEFAULT_CAN_ACTIVATE_PUSH;
basesink->can_activate_pull = DEFAULT_CAN_ACTIVATE_PULL;
basesink->sync = DEFAULT_SYNC;
basesink->max_lateness = DEFAULT_MAX_LATENESS;
g_atomic_int_set (&priv->qos_enabled, DEFAULT_QOS);
priv->async_enabled = DEFAULT_ASYNC;
priv->ts_offset = DEFAULT_TS_OFFSET;
priv->render_delay = DEFAULT_RENDER_DELAY;
priv->blocksize = DEFAULT_BLOCKSIZE;
priv->cached_clock_id = NULL;
g_atomic_int_set (&priv->enable_last_sample, DEFAULT_ENABLE_LAST_SAMPLE);
priv->throttle_time = DEFAULT_THROTTLE_TIME;
priv->max_bitrate = DEFAULT_MAX_BITRATE;
GST_OBJECT_FLAG_SET (basesink, GST_ELEMENT_FLAG_SINK);
}
static void
gst_base_sink_finalize (GObject * object)
{
GstBaseSink *basesink;
basesink = GST_BASE_SINK (object);
g_mutex_clear (&basesink->preroll_lock);
g_cond_clear (&basesink->preroll_cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gst_base_sink_set_sync:
* @sink: the sink
* @sync: the new sync value.
*
* Configures @sink to synchronize on the clock or not. When
* @sync is FALSE, incoming samples will be played as fast as
* possible. If @sync is TRUE, the timestamps of the incomming
* buffers will be used to schedule the exact render time of its
* contents.
*/
void
gst_base_sink_set_sync (GstBaseSink * sink, gboolean sync)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
sink->sync = sync;
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_get_sync:
* @sink: the sink
*
* Checks if @sink is currently configured to synchronize against the
* clock.
*
* Returns: TRUE if the sink is configured to synchronize against the clock.
*/
gboolean
gst_base_sink_get_sync (GstBaseSink * sink)
{
gboolean res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
GST_OBJECT_LOCK (sink);
res = sink->sync;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_set_max_lateness:
* @sink: the sink
* @max_lateness: the new max lateness value.
*
* Sets the new max lateness value to @max_lateness. This value is
* used to decide if a buffer should be dropped or not based on the
* buffer timestamp and the current clock time. A value of -1 means
* an unlimited time.
*/
void
gst_base_sink_set_max_lateness (GstBaseSink * sink, gint64 max_lateness)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
sink->max_lateness = max_lateness;
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_get_max_lateness:
* @sink: the sink
*
* Gets the max lateness value. See gst_base_sink_set_max_lateness for
* more details.
*
* Returns: The maximum time in nanoseconds that a buffer can be late
* before it is dropped and not rendered. A value of -1 means an
* unlimited time.
*/
gint64
gst_base_sink_get_max_lateness (GstBaseSink * sink)
{
gint64 res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), -1);
GST_OBJECT_LOCK (sink);
res = sink->max_lateness;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_set_qos_enabled:
* @sink: the sink
* @enabled: the new qos value.
*
* Configures @sink to send Quality-of-Service events upstream.
*/
void
gst_base_sink_set_qos_enabled (GstBaseSink * sink, gboolean enabled)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
g_atomic_int_set (&sink->priv->qos_enabled, enabled);
}
/**
* gst_base_sink_is_qos_enabled:
* @sink: the sink
*
* Checks if @sink is currently configured to send Quality-of-Service events
* upstream.
*
* Returns: TRUE if the sink is configured to perform Quality-of-Service.
*/
gboolean
gst_base_sink_is_qos_enabled (GstBaseSink * sink)
{
gboolean res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
res = g_atomic_int_get (&sink->priv->qos_enabled);
return res;
}
/**
* gst_base_sink_set_async_enabled:
* @sink: the sink
* @enabled: the new async value.
*
* Configures @sink to perform all state changes asynchronusly. When async is
* disabled, the sink will immediately go to PAUSED instead of waiting for a
* preroll buffer. This feature is useful if the sink does not synchronize
* against the clock or when it is dealing with sparse streams.
*/
void
gst_base_sink_set_async_enabled (GstBaseSink * sink, gboolean enabled)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_BASE_SINK_PREROLL_LOCK (sink);
g_atomic_int_set (&sink->priv->async_enabled, enabled);
GST_LOG_OBJECT (sink, "set async enabled to %d", enabled);
GST_BASE_SINK_PREROLL_UNLOCK (sink);
}
/**
* gst_base_sink_is_async_enabled:
* @sink: the sink
*
* Checks if @sink is currently configured to perform asynchronous state
* changes to PAUSED.
*
* Returns: TRUE if the sink is configured to perform asynchronous state
* changes.
*/
gboolean
gst_base_sink_is_async_enabled (GstBaseSink * sink)
{
gboolean res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
res = g_atomic_int_get (&sink->priv->async_enabled);
return res;
}
/**
* gst_base_sink_set_ts_offset:
* @sink: the sink
* @offset: the new offset
*
* Adjust the synchronisation of @sink with @offset. A negative value will
* render buffers earlier than their timestamp. A positive value will delay
* rendering. This function can be used to fix playback of badly timestamped
* buffers.
*/
void
gst_base_sink_set_ts_offset (GstBaseSink * sink, GstClockTimeDiff offset)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
sink->priv->ts_offset = offset;
GST_LOG_OBJECT (sink, "set time offset to %" G_GINT64_FORMAT, offset);
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_get_ts_offset:
* @sink: the sink
*
* Get the synchronisation offset of @sink.
*
* Returns: The synchronisation offset.
*/
GstClockTimeDiff
gst_base_sink_get_ts_offset (GstBaseSink * sink)
{
GstClockTimeDiff res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
GST_OBJECT_LOCK (sink);
res = sink->priv->ts_offset;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_get_last_sample:
* @sink: the sink
*
* Get the last sample that arrived in the sink and was used for preroll or for
* rendering. This property can be used to generate thumbnails.
*
* The #GstCaps on the sample can be used to determine the type of the buffer.
*
* Free-function: gst_sample_unref
*
* Returns: (transfer full): a #GstSample. gst_sample_unref() after usage.
* This function returns NULL when no buffer has arrived in the sink yet
* or when the sink is not in PAUSED or PLAYING.
*/
GstSample *
gst_base_sink_get_last_sample (GstBaseSink * sink)
{
GstSample *res = NULL;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), NULL);
GST_OBJECT_LOCK (sink);
if (sink->priv->last_buffer) {
res = gst_sample_new (sink->priv->last_buffer,
sink->priv->last_caps, &sink->segment, NULL);
}
GST_OBJECT_UNLOCK (sink);
return res;
}
/* with OBJECT_LOCK */
static void
gst_base_sink_set_last_buffer_unlocked (GstBaseSink * sink, GstBuffer * buffer)
{
GstBuffer *old;
old = sink->priv->last_buffer;
if (G_LIKELY (old != buffer)) {
GST_DEBUG_OBJECT (sink, "setting last buffer to %p", buffer);
if (G_LIKELY (buffer))
gst_buffer_ref (buffer);
sink->priv->last_buffer = buffer;
if (buffer)
/* copy over the caps */
gst_caps_replace (&sink->priv->last_caps, sink->priv->caps);
else
gst_caps_replace (&sink->priv->last_caps, NULL);
} else {
old = NULL;
}
/* avoid unreffing with the lock because cleanup code might want to take the
* lock too */
if (G_LIKELY (old)) {
GST_OBJECT_UNLOCK (sink);
gst_buffer_unref (old);
GST_OBJECT_LOCK (sink);
}
}
static void
gst_base_sink_set_last_buffer (GstBaseSink * sink, GstBuffer * buffer)
{
if (!g_atomic_int_get (&sink->priv->enable_last_sample))
return;
GST_OBJECT_LOCK (sink);
gst_base_sink_set_last_buffer_unlocked (sink, buffer);
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_set_last_sample_enabled:
* @sink: the sink
* @enabled: the new enable-last-sample value.
*
* Configures @sink to store the last received sample in the last-sample
* property.
*/
void
gst_base_sink_set_last_sample_enabled (GstBaseSink * sink, gboolean enabled)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
/* Only take lock if we change the value */
if (g_atomic_int_compare_and_exchange (&sink->priv->enable_last_sample,
!enabled, enabled) && !enabled) {
GST_OBJECT_LOCK (sink);
gst_base_sink_set_last_buffer_unlocked (sink, NULL);
GST_OBJECT_UNLOCK (sink);
}
}
/**
* gst_base_sink_is_last_sample_enabled:
* @sink: the sink
*
* Checks if @sink is currently configured to store the last received sample in
* the last-sample property.
*
* Returns: TRUE if the sink is configured to store the last received sample.
*/
gboolean
gst_base_sink_is_last_sample_enabled (GstBaseSink * sink)
{
g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
return g_atomic_int_get (&sink->priv->enable_last_sample);
}
/**
* gst_base_sink_get_latency:
* @sink: the sink
*
* Get the currently configured latency.
*
* Returns: The configured latency.
*/
GstClockTime
gst_base_sink_get_latency (GstBaseSink * sink)
{
GstClockTime res;
GST_OBJECT_LOCK (sink);
res = sink->priv->latency;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_query_latency:
* @sink: the sink
* @live: (out) (allow-none): if the sink is live
* @upstream_live: (out) (allow-none): if an upstream element is live
* @min_latency: (out) (allow-none): the min latency of the upstream elements
* @max_latency: (out) (allow-none): the max latency of the upstream elements
*
* Query the sink for the latency parameters. The latency will be queried from
* the upstream elements. @live will be TRUE if @sink is configured to
* synchronize against the clock. @upstream_live will be TRUE if an upstream
* element is live.
*
* If both @live and @upstream_live are TRUE, the sink will want to compensate
* for the latency introduced by the upstream elements by setting the
* @min_latency to a strictly possitive value.
*
* This function is mostly used by subclasses.
*
* Returns: TRUE if the query succeeded.
*/
gboolean
gst_base_sink_query_latency (GstBaseSink * sink, gboolean * live,
gboolean * upstream_live, GstClockTime * min_latency,
GstClockTime * max_latency)
{
gboolean l, us_live, res, have_latency;
GstClockTime min, max, render_delay;
GstQuery *query;
GstClockTime us_min, us_max;
/* we are live when we sync to the clock */
GST_OBJECT_LOCK (sink);
l = sink->sync;
have_latency = sink->priv->have_latency;
render_delay = sink->priv->render_delay;
GST_OBJECT_UNLOCK (sink);
/* assume no latency */
min = 0;
max = -1;
us_live = FALSE;
if (have_latency) {
GST_DEBUG_OBJECT (sink, "we are ready for LATENCY query");
/* we are ready for a latency query this is when we preroll or when we are
* not async. */
query = gst_query_new_latency ();
/* ask the peer for the latency */
if ((res = gst_pad_peer_query (sink->sinkpad, query))) {
/* get upstream min and max latency */
gst_query_parse_latency (query, &us_live, &us_min, &us_max);
if (us_live) {
/* upstream live, use its latency, subclasses should use these
* values to create the complete latency. */
min = us_min;
max = us_max;
}
if (l) {
/* we need to add the render delay if we are live */
if (min != -1)
min += render_delay;
if (max != -1)
max += render_delay;
}
}
gst_query_unref (query);
} else {
GST_DEBUG_OBJECT (sink, "we are not yet ready for LATENCY query");
res = FALSE;
}
/* not live, we tried to do the query, if it failed we return TRUE anyway */
if (!res) {
if (!l) {
res = TRUE;
GST_DEBUG_OBJECT (sink, "latency query failed but we are not live");
} else {
GST_DEBUG_OBJECT (sink, "latency query failed and we are live");
}
}
if (res) {
GST_DEBUG_OBJECT (sink, "latency query: live: %d, have_latency %d,"
" upstream: %d, min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT, l,
have_latency, us_live, GST_TIME_ARGS (min), GST_TIME_ARGS (max));
if (live)
*live = l;
if (upstream_live)
*upstream_live = us_live;
if (min_latency)
*min_latency = min;
if (max_latency)
*max_latency = max;
}
return res;
}
/**
* gst_base_sink_set_render_delay:
* @sink: a #GstBaseSink
* @delay: the new delay
*
* Set the render delay in @sink to @delay. The render delay is the time
* between actual rendering of a buffer and its synchronisation time. Some
* devices might delay media rendering which can be compensated for with this
* function.
*
* After calling this function, this sink will report additional latency and
* other sinks will adjust their latency to delay the rendering of their media.
*
* This function is usually called by subclasses.
*/
void
gst_base_sink_set_render_delay (GstBaseSink * sink, GstClockTime delay)
{
GstClockTime old_render_delay;
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
old_render_delay = sink->priv->render_delay;
sink->priv->render_delay = delay;
GST_LOG_OBJECT (sink, "set render delay to %" GST_TIME_FORMAT,
GST_TIME_ARGS (delay));
GST_OBJECT_UNLOCK (sink);
if (delay != old_render_delay) {
GST_DEBUG_OBJECT (sink, "posting latency changed");
gst_element_post_message (GST_ELEMENT_CAST (sink),
gst_message_new_latency (GST_OBJECT_CAST (sink)));
}
}
/**
* gst_base_sink_get_render_delay:
* @sink: a #GstBaseSink
*
* Get the render delay of @sink. see gst_base_sink_set_render_delay() for more
* information about the render delay.
*
* Returns: the render delay of @sink.
*/
GstClockTime
gst_base_sink_get_render_delay (GstBaseSink * sink)
{
GstClockTimeDiff res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
GST_OBJECT_LOCK (sink);
res = sink->priv->render_delay;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_set_blocksize:
* @sink: a #GstBaseSink
* @blocksize: the blocksize in bytes
*
* Set the number of bytes that the sink will pull when it is operating in pull
* mode.
*/
/* FIXME 0.11: blocksize property should be int, otherwise min>max.. */
void
gst_base_sink_set_blocksize (GstBaseSink * sink, guint blocksize)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
sink->priv->blocksize = blocksize;
GST_LOG_OBJECT (sink, "set blocksize to %u", blocksize);
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_get_blocksize:
* @sink: a #GstBaseSink
*
* Get the number of bytes that the sink will pull when it is operating in pull
* mode.
*
* Returns: the number of bytes @sink will pull in pull mode.
*/
/* FIXME 0.11: blocksize property should be int, otherwise min>max.. */
guint
gst_base_sink_get_blocksize (GstBaseSink * sink)
{
guint res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
GST_OBJECT_LOCK (sink);
res = sink->priv->blocksize;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_set_throttle_time:
* @sink: a #GstBaseSink
* @throttle: the throttle time in nanoseconds
*
* Set the time that will be inserted between rendered buffers. This
* can be used to control the maximum buffers per second that the sink
* will render.
*/
void
gst_base_sink_set_throttle_time (GstBaseSink * sink, guint64 throttle)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
sink->priv->throttle_time = throttle;
GST_LOG_OBJECT (sink, "set throttle_time to %" G_GUINT64_FORMAT, throttle);
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_get_throttle_time:
* @sink: a #GstBaseSink
*
* Get the time that will be inserted between frames to control the
* maximum buffers per second.
*
* Returns: the number of nanoseconds @sink will put between frames.
*/
guint64
gst_base_sink_get_throttle_time (GstBaseSink * sink)
{
guint64 res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
GST_OBJECT_LOCK (sink);
res = sink->priv->throttle_time;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_set_max_bitrate:
* @sink: a #GstBaseSink
* @max_bitrate: the max_bitrate in bits per second
*
* Set the maximum amount of bits per second that the sink will render.
*
* Since: 1.1.1
*/
void
gst_base_sink_set_max_bitrate (GstBaseSink * sink, guint64 max_bitrate)
{
g_return_if_fail (GST_IS_BASE_SINK (sink));
GST_OBJECT_LOCK (sink);
sink->priv->max_bitrate = max_bitrate;
GST_LOG_OBJECT (sink, "set max_bitrate to %" G_GUINT64_FORMAT, max_bitrate);
GST_OBJECT_UNLOCK (sink);
}
/**
* gst_base_sink_get_max_bitrate:
* @sink: a #GstBaseSink
*
* Get the maximum amount of bits per second that the sink will render.
*
* Returns: the maximum number of bits per second @sink will render.
*
* Since: 1.1.1
*/
guint64
gst_base_sink_get_max_bitrate (GstBaseSink * sink)
{
guint64 res;
g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
GST_OBJECT_LOCK (sink);
res = sink->priv->max_bitrate;
GST_OBJECT_UNLOCK (sink);
return res;
}
static void
gst_base_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseSink *sink = GST_BASE_SINK (object);
switch (prop_id) {
case PROP_SYNC:
gst_base_sink_set_sync (sink, g_value_get_boolean (value));
break;
case PROP_MAX_LATENESS:
gst_base_sink_set_max_lateness (sink, g_value_get_int64 (value));
break;
case PROP_QOS:
gst_base_sink_set_qos_enabled (sink, g_value_get_boolean (value));
break;
case PROP_ASYNC:
gst_base_sink_set_async_enabled (sink, g_value_get_boolean (value));
break;
case PROP_TS_OFFSET:
gst_base_sink_set_ts_offset (sink, g_value_get_int64 (value));
break;
case PROP_BLOCKSIZE:
gst_base_sink_set_blocksize (sink, g_value_get_uint (value));
break;
case PROP_RENDER_DELAY:
gst_base_sink_set_render_delay (sink, g_value_get_uint64 (value));
break;
case PROP_ENABLE_LAST_SAMPLE:
gst_base_sink_set_last_sample_enabled (sink, g_value_get_boolean (value));
break;
case PROP_THROTTLE_TIME:
gst_base_sink_set_throttle_time (sink, g_value_get_uint64 (value));
break;
case PROP_MAX_BITRATE:
gst_base_sink_set_max_bitrate (sink, g_value_get_uint64 (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_sink_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBaseSink *sink = GST_BASE_SINK (object);
switch (prop_id) {
case PROP_SYNC:
g_value_set_boolean (value, gst_base_sink_get_sync (sink));
break;
case PROP_MAX_LATENESS:
g_value_set_int64 (value, gst_base_sink_get_max_lateness (sink));
break;
case PROP_QOS:
g_value_set_boolean (value, gst_base_sink_is_qos_enabled (sink));
break;
case PROP_ASYNC:
g_value_set_boolean (value, gst_base_sink_is_async_enabled (sink));
break;
case PROP_TS_OFFSET:
g_value_set_int64 (value, gst_base_sink_get_ts_offset (sink));
break;
case PROP_LAST_SAMPLE:
gst_value_take_buffer (value, gst_base_sink_get_last_sample (sink));
break;
case PROP_ENABLE_LAST_SAMPLE:
g_value_set_boolean (value, gst_base_sink_is_last_sample_enabled (sink));
break;
case PROP_BLOCKSIZE:
g_value_set_uint (value, gst_base_sink_get_blocksize (sink));
break;
case PROP_RENDER_DELAY:
g_value_set_uint64 (value, gst_base_sink_get_render_delay (sink));
break;
case PROP_THROTTLE_TIME:
g_value_set_uint64 (value, gst_base_sink_get_throttle_time (sink));
break;
case PROP_MAX_BITRATE:
g_value_set_uint64 (value, gst_base_sink_get_max_bitrate (sink));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
gst_base_sink_default_get_caps (GstBaseSink * sink, GstCaps * filter)
{
return NULL;
}
static gboolean
gst_base_sink_default_set_caps (GstBaseSink * sink, GstCaps * caps)
{
return TRUE;
}
/* with PREROLL_LOCK, STREAM_LOCK */
static gboolean
gst_base_sink_commit_state (GstBaseSink * basesink)
{
/* commit state and proceed to next pending state */
GstState current, next, pending, post_pending;
gboolean post_paused = FALSE;
gboolean post_async_done = FALSE;
gboolean post_playing = FALSE;
/* we are certainly not playing async anymore now */
basesink->playing_async = FALSE;
GST_OBJECT_LOCK (basesink);
current = GST_STATE (basesink);
next = GST_STATE_NEXT (basesink);
pending = GST_STATE_PENDING (basesink);
post_pending = pending;
switch (pending) {
case GST_STATE_PLAYING:
{
GST_DEBUG_OBJECT (basesink, "commiting state to PLAYING");
basesink->need_preroll = FALSE;
post_async_done = TRUE;
basesink->priv->commited = TRUE;
post_playing = TRUE;
/* post PAUSED too when we were READY */
if (current == GST_STATE_READY) {
post_paused = TRUE;
}
break;
}
case GST_STATE_PAUSED:
GST_DEBUG_OBJECT (basesink, "commiting state to PAUSED");
post_paused = TRUE;
post_async_done = TRUE;
basesink->priv->commited = TRUE;
post_pending = GST_STATE_VOID_PENDING;
break;
case GST_STATE_READY:
case GST_STATE_NULL:
goto stopping;
case GST_STATE_VOID_PENDING:
goto nothing_pending;
default:
break;
}
/* we can report latency queries now */
basesink->priv->have_latency = TRUE;
GST_STATE (basesink) = pending;
GST_STATE_NEXT (basesink) = GST_STATE_VOID_PENDING;
GST_STATE_PENDING (basesink) = GST_STATE_VOID_PENDING;
GST_STATE_RETURN (basesink) = GST_STATE_CHANGE_SUCCESS;
GST_OBJECT_UNLOCK (basesink);
if (post_paused) {
GST_DEBUG_OBJECT (basesink, "posting PAUSED state change message");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
current, next, post_pending));
}
if (post_async_done) {
GST_DEBUG_OBJECT (basesink, "posting async-done message");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_async_done (GST_OBJECT_CAST (basesink),
GST_CLOCK_TIME_NONE));
}
if (post_playing) {
if (post_paused) {
GstElementClass *klass;
klass = GST_ELEMENT_GET_CLASS (basesink);
basesink->have_preroll = TRUE;
/* after releasing this lock, the state change function
* can execute concurrently with this thread. There is nothing we do to
* prevent this for now. subclasses should be prepared to handle it. */
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
if (klass->change_state)
klass->change_state (GST_ELEMENT_CAST (basesink),
GST_STATE_CHANGE_PAUSED_TO_PLAYING);
GST_BASE_SINK_PREROLL_LOCK (basesink);
/* state change function could have been executed and we could be
* flushing now */
if (G_UNLIKELY (basesink->flushing))
goto stopping;
}
GST_DEBUG_OBJECT (basesink, "posting PLAYING state change message");
/* FIXME, we released the PREROLL lock above, it's possible that this
* message is not correct anymore when the element went back to PAUSED */
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
next, pending, GST_STATE_VOID_PENDING));
}
GST_STATE_BROADCAST (basesink);
return TRUE;
nothing_pending:
{
/* Depending on the state, set our vars. We get in this situation when the
* state change function got a change to update the state vars before the
* streaming thread did. This is fine but we need to make sure that we
* update the need_preroll var since it was TRUE when we got here and might
* become FALSE if we got to PLAYING. */
GST_DEBUG_OBJECT (basesink, "nothing to commit, now in %s",
gst_element_state_get_name (current));
switch (current) {
case GST_STATE_PLAYING:
basesink->need_preroll = FALSE;
break;
case GST_STATE_PAUSED:
basesink->need_preroll = TRUE;
break;
default:
basesink->need_preroll = FALSE;
basesink->flushing = TRUE;
break;
}
/* we can report latency queries now */
basesink->priv->have_latency = TRUE;
GST_OBJECT_UNLOCK (basesink);
return TRUE;
}
stopping:
{
/* app is going to READY */
GST_DEBUG_OBJECT (basesink, "stopping");
basesink->need_preroll = FALSE;
basesink->flushing = TRUE;
GST_OBJECT_UNLOCK (basesink);
return FALSE;
}
}
static void
start_stepping (GstBaseSink * sink, GstSegment * segment,
GstStepInfo * pending, GstStepInfo * current)
{
gint64 end;
GstMessage *message;
GST_DEBUG_OBJECT (sink, "update pending step");
GST_OBJECT_LOCK (sink);
memcpy (current, pending, sizeof (GstStepInfo));
pending->valid = FALSE;
GST_OBJECT_UNLOCK (sink);
/* post message first */
message =
gst_message_new_step_start (GST_OBJECT (sink), TRUE, current->format,
current->amount, current->rate, current->flush, current->intermediate);
gst_message_set_seqnum (message, current->seqnum);
gst_element_post_message (GST_ELEMENT (sink), message);
/* get the running time of where we paused and remember it */
current->start = gst_element_get_start_time (GST_ELEMENT_CAST (sink));
gst_segment_set_running_time (segment, GST_FORMAT_TIME, current->start);
/* set the new rate for the remainder of the segment */
current->start_rate = segment->rate;
segment->rate *= current->rate;
/* save values */
if (segment->rate > 0.0)
current->start_stop = segment->stop;
else
current->start_start = segment->start;
if (current->format == GST_FORMAT_TIME) {
/* calculate the running-time when the step operation should stop */
if (current->amount != -1)
end = current->start + current->amount;
else
end = -1;
if (!current->flush) {
gint64 position;
/* update the segment clipping regions for non-flushing seeks */
if (segment->rate > 0.0) {
if (end != -1)
position = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
else
position = segment->stop;
segment->stop = position;
segment->position = position;
} else {
if (end != -1)
position = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
else
position = segment->start;
segment->time = position;
segment->start = position;
segment->position = position;
}
}
}
GST_DEBUG_OBJECT (sink, "segment now %" GST_SEGMENT_FORMAT, segment);
GST_DEBUG_OBJECT (sink, "step started at running_time %" GST_TIME_FORMAT,
GST_TIME_ARGS (current->start));
GST_DEBUG_OBJECT (sink, "step amount: %" G_GUINT64_FORMAT ", format: %s, "
"rate: %f", current->amount, gst_format_get_name (current->format),
current->rate);
}
static void
stop_stepping (GstBaseSink * sink, GstSegment * segment,
GstStepInfo * current, gint64 rstart, gint64 rstop, gboolean eos)
{
gint64 stop, position;
GstMessage *message;
GST_DEBUG_OBJECT (sink, "step complete");
if (segment->rate > 0.0)
stop = rstart;
else
stop = rstop;
GST_DEBUG_OBJECT (sink,
"step stop at running_time %" GST_TIME_FORMAT, GST_TIME_ARGS (stop));
if (stop == -1)
current->duration = current->position;
else
current->duration = stop - current->start;
GST_DEBUG_OBJECT (sink, "step elapsed running_time %" GST_TIME_FORMAT,
GST_TIME_ARGS (current->duration));
position = current->start + current->duration;
/* now move the segment to the new running time */
gst_segment_set_running_time (segment, GST_FORMAT_TIME, position);
if (current->flush) {
/* and remove the time we flushed, start time did not change */
segment->base = current->start;
} else {
/* start time is now the stepped position */
gst_element_set_start_time (GST_ELEMENT_CAST (sink), position);
}
/* restore the previous rate */
segment->rate = current->start_rate;
if (segment->rate > 0.0)
segment->stop = current->start_stop;
else
segment->start = current->start_start;
/* post the step done when we know the stepped duration in TIME */
message =
gst_message_new_step_done (GST_OBJECT_CAST (sink), current->format,
current->amount, current->rate, current->flush, current->intermediate,
current->duration, eos);
gst_message_set_seqnum (message, current->seqnum);
gst_element_post_message (GST_ELEMENT_CAST (sink), message);
if (!current->intermediate)
sink->need_preroll = current->need_preroll;
/* and the current step info finished and becomes invalid */
current->valid = FALSE;
}
static gboolean
handle_stepping (GstBaseSink * sink, GstSegment * segment,
GstStepInfo * current, guint64 * cstart, guint64 * cstop, guint64 * rstart,
guint64 * rstop)
{
gboolean step_end = FALSE;
/* stepping never stops */
if (current->amount == -1)
return FALSE;
/* see if we need to skip this buffer because of stepping */
switch (current->format) {
case GST_FORMAT_TIME:
{
guint64 end;
guint64 first, last;
gdouble abs_rate;
if (segment->rate > 0.0) {
if (segment->stop == *cstop)
*rstop = *rstart + current->amount;
first = *rstart;
last = *rstop;
} else {
if (segment->start == *cstart)
*rstart = *rstop + current->amount;
first = *rstop;
last = *rstart;
}
end = current->start + current->amount;
current->position = first - current->start;
abs_rate = ABS (segment->rate);
if (G_UNLIKELY (abs_rate != 1.0))
current->position /= abs_rate;
GST_DEBUG_OBJECT (sink,
"buffer: %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
GST_TIME_ARGS (first), GST_TIME_ARGS (last));
GST_DEBUG_OBJECT (sink,
"got time step %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT "/%"
GST_TIME_FORMAT, GST_TIME_ARGS (current->position),
GST_TIME_ARGS (last - current->start),
GST_TIME_ARGS (current->amount));
if ((current->flush && current->position >= current->amount)
|| last >= end) {
GST_DEBUG_OBJECT (sink, "step ended, we need clipping");
step_end = TRUE;
if (segment->rate > 0.0) {
*rstart = end;
*cstart = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
} else {
*rstop = end;
*cstop = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
}
}
GST_DEBUG_OBJECT (sink,
"cstart %" GST_TIME_FORMAT ", rstart %" GST_TIME_FORMAT,
GST_TIME_ARGS (*cstart), GST_TIME_ARGS (*rstart));
GST_DEBUG_OBJECT (sink,
"cstop %" GST_TIME_FORMAT ", rstop %" GST_TIME_FORMAT,
GST_TIME_ARGS (*cstop), GST_TIME_ARGS (*rstop));
break;
}
case GST_FORMAT_BUFFERS:
GST_DEBUG_OBJECT (sink,
"got default step %" G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT,
current->position, current->amount);
if (current->position < current->amount) {
current->position++;
} else {
step_end = TRUE;
}
break;
case GST_FORMAT_DEFAULT:
default:
GST_DEBUG_OBJECT (sink,
"got unknown step %" G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT,
current->position, current->amount);
break;
}
return step_end;
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Returns TRUE if the object needs synchronisation and takes therefore
* part in prerolling.
*
* rsstart/rsstop contain the start/stop in stream time.
* rrstart/rrstop contain the start/stop in running time.
*/
static gboolean
gst_base_sink_get_sync_times (GstBaseSink * basesink, GstMiniObject * obj,
GstClockTime * rsstart, GstClockTime * rsstop,
GstClockTime * rrstart, GstClockTime * rrstop, GstClockTime * rrnext,
gboolean * do_sync, gboolean * stepped, GstStepInfo * step,
gboolean * step_end)
{
GstBaseSinkClass *bclass;
GstClockTime start, stop; /* raw start/stop timestamps */
guint64 cstart, cstop; /* clipped raw timestamps */
guint64 rstart, rstop, rnext; /* clipped timestamps converted to running time */
GstClockTime sstart, sstop; /* clipped timestamps converted to stream time */
GstFormat format;
GstBaseSinkPrivate *priv;
GstSegment *segment;
gboolean eos;
priv = basesink->priv;
segment = &basesink->segment;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
again:
/* start with nothing */
start = stop = GST_CLOCK_TIME_NONE;
eos = FALSE;
if (G_UNLIKELY (GST_IS_EVENT (obj))) {
GstEvent *event = GST_EVENT_CAST (obj);
switch (GST_EVENT_TYPE (event)) {
/* EOS event needs syncing */
case GST_EVENT_EOS:
{
if (segment->rate >= 0.0) {
sstart = sstop = priv->current_sstop;
if (!GST_CLOCK_TIME_IS_VALID (sstart)) {
/* we have not seen a buffer yet, use the segment values */
sstart = sstop = gst_segment_to_stream_time (segment,
segment->format, segment->stop);
}
} else {
sstart = sstop = priv->current_sstart;
if (!GST_CLOCK_TIME_IS_VALID (sstart)) {
/* we have not seen a buffer yet, use the segment values */
sstart = sstop = gst_segment_to_stream_time (segment,
segment->format, segment->start);
}
}
rstart = rstop = rnext = priv->eos_rtime;
*do_sync = rstart != -1;
GST_DEBUG_OBJECT (basesink, "sync times for EOS %" GST_TIME_FORMAT,
GST_TIME_ARGS (rstart));
/* if we are stepping, we end now */
*step_end = step->valid;
eos = TRUE;
goto eos_done;
}
case GST_EVENT_GAP:
{
GstClockTime timestamp, duration;
gst_event_parse_gap (event, &timestamp, &duration);
GST_DEBUG_OBJECT (basesink, "Got Gap time %" GST_TIME_FORMAT
" duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
start = timestamp;
if (GST_CLOCK_TIME_IS_VALID (duration))
stop = start + duration;
}
*do_sync = TRUE;
break;
}
default:
/* other events do not need syncing */
return FALSE;
}
} else {
/* else do buffer sync code */
GstBuffer *buffer = GST_BUFFER_CAST (obj);
/* just get the times to see if we need syncing, if the start returns -1 we
* don't sync. */
if (bclass->get_times)
bclass->get_times (basesink, buffer, &start, &stop);
if (!GST_CLOCK_TIME_IS_VALID (start)) {
/* we don't need to sync but we still want to get the timestamps for
* tracking the position */
gst_base_sink_default_get_times (basesink, buffer, &start, &stop);
*do_sync = FALSE;
} else {
*do_sync = TRUE;
}
}
GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
", stop: %" GST_TIME_FORMAT ", do_sync %d", GST_TIME_ARGS (start),
GST_TIME_ARGS (stop), *do_sync);
/* collect segment and format for code clarity */
format = segment->format;
/* clip */
if (G_UNLIKELY (!gst_segment_clip (segment, format,
start, stop, &cstart, &cstop))) {
if (step->valid) {
GST_DEBUG_OBJECT (basesink, "step out of segment");
/* when we are stepping, pretend we're at the end of the segment */
if (segment->rate > 0.0) {
cstart = segment->stop;
cstop = segment->stop;
} else {
cstart = segment->start;
cstop = segment->start;
}
goto do_times;
}
goto out_of_segment;
}
if (G_UNLIKELY (start != cstart || stop != cstop)) {
GST_DEBUG_OBJECT (basesink, "clipped to: start %" GST_TIME_FORMAT
", stop: %" GST_TIME_FORMAT, GST_TIME_ARGS (cstart),
GST_TIME_ARGS (cstop));
}
/* set last stop position */
if (G_LIKELY (stop != GST_CLOCK_TIME_NONE && cstop != GST_CLOCK_TIME_NONE))
segment->position = cstop;
else
segment->position = cstart;
do_times:
rstart = gst_segment_to_running_time (segment, format, cstart);
rstop = gst_segment_to_running_time (segment, format, cstop);
if (GST_CLOCK_TIME_IS_VALID (stop))
rnext = rstop;
else
rnext = rstart;
if (G_UNLIKELY (step->valid)) {
if (!(*step_end = handle_stepping (basesink, segment, step, &cstart, &cstop,
&rstart, &rstop))) {
/* step is still busy, we discard data when we are flushing */
*stepped = step->flush;
GST_DEBUG_OBJECT (basesink, "stepping busy");
}
}
/* this can produce wrong values if we accumulated non-TIME segments. If this happens,
* upstream is behaving very badly */
sstart = gst_segment_to_stream_time (segment, format, cstart);
sstop = gst_segment_to_stream_time (segment, format, cstop);
eos_done:
/* eos_done label only called when doing EOS, we also stop stepping then */
if (*step_end && step->flush) {
GST_DEBUG_OBJECT (basesink, "flushing step ended");
stop_stepping (basesink, segment, step, rstart, rstop, eos);
*step_end = FALSE;
/* re-determine running start times for adjusted segment
* (which has a flushed amount of running/accumulated time removed) */
if (!GST_IS_EVENT (obj)) {
GST_DEBUG_OBJECT (basesink, "refresh sync times");
goto again;
}
}
/* save times */
*rsstart = sstart;
*rsstop = sstop;
*rrstart = rstart;
*rrstop = rstop;
*rrnext = rnext;
/* buffers and EOS always need syncing and preroll */
return TRUE;
/* special cases */
out_of_segment:
{
/* we usually clip in the chain function already but stepping could cause
* the segment to be updated later. we return FALSE so that we don't try
* to sync on it. */
GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
return FALSE;
}
}
/* with STREAM_LOCK, PREROLL_LOCK, LOCK
* adjust a timestamp with the latency and timestamp offset. This function does
* not adjust for the render delay. */
static GstClockTime
gst_base_sink_adjust_time (GstBaseSink * basesink, GstClockTime time)
{
GstClockTimeDiff ts_offset;
/* don't do anything funny with invalid timestamps */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time)))
return time;
time += basesink->priv->latency;
/* apply offset, be carefull for underflows */
ts_offset = basesink->priv->ts_offset;
if (ts_offset < 0) {
ts_offset = -ts_offset;
if (ts_offset < time)
time -= ts_offset;
else
time = 0;
} else
time += ts_offset;
/* subtract the render delay again, which was included in the latency */
if (time > basesink->priv->render_delay)
time -= basesink->priv->render_delay;
else
time = 0;
return time;
}
/**
* gst_base_sink_wait_clock:
* @sink: the sink
* @time: the running_time to be reached
* @jitter: (out) (allow-none): the jitter to be filled with time diff, or NULL
*
* This function will block until @time is reached. It is usually called by
* subclasses that use their own internal synchronisation.
*
* If @time is not valid, no sycnhronisation is done and #GST_CLOCK_BADTIME is
* returned. Likewise, if synchronisation is disabled in the element or there
* is no clock, no synchronisation is done and #GST_CLOCK_BADTIME is returned.
*
* This function should only be called with the PREROLL_LOCK held, like when
* receiving an EOS event in the #GstBaseSinkClass.event() vmethod or when
* receiving a buffer in
* the #GstBaseSinkClass.render() vmethod.
*
* The @time argument should be the running_time of when this method should
* return and is not adjusted with any latency or offset configured in the
* sink.
*
* Returns: #GstClockReturn
*/
GstClockReturn
gst_base_sink_wait_clock (GstBaseSink * sink, GstClockTime time,
GstClockTimeDiff * jitter)
{
GstClockReturn ret;
GstClock *clock;
GstClockTime base_time;
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time)))
goto invalid_time;
GST_OBJECT_LOCK (sink);
if (G_UNLIKELY (!sink->sync))
goto no_sync;
if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (sink)) == NULL))
goto no_clock;
base_time = GST_ELEMENT_CAST (sink)->base_time;
GST_LOG_OBJECT (sink,
"time %" GST_TIME_FORMAT ", base_time %" GST_TIME_FORMAT,
GST_TIME_ARGS (time), GST_TIME_ARGS (base_time));
/* add base_time to running_time to get the time against the clock */
time += base_time;
/* Re-use existing clockid if available */
/* FIXME: Casting to GstClockEntry only works because the types
* are the same */
if (G_LIKELY (sink->priv->cached_clock_id != NULL
&& GST_CLOCK_ENTRY_CLOCK ((GstClockEntry *) sink->priv->
cached_clock_id) == clock)) {
if (!gst_clock_single_shot_id_reinit (clock, sink->priv->cached_clock_id,
time)) {
gst_clock_id_unref (sink->priv->cached_clock_id);
sink->priv->cached_clock_id = gst_clock_new_single_shot_id (clock, time);
}
} else {
if (sink->priv->cached_clock_id != NULL)
gst_clock_id_unref (sink->priv->cached_clock_id);
sink->priv->cached_clock_id = gst_clock_new_single_shot_id (clock, time);
}
GST_OBJECT_UNLOCK (sink);
/* A blocking wait is performed on the clock. We save the ClockID
* so we can unlock the entry at any time. While we are blocking, we
* release the PREROLL_LOCK so that other threads can interrupt the
* entry. */
sink->clock_id = sink->priv->cached_clock_id;
/* release the preroll lock while waiting */
GST_BASE_SINK_PREROLL_UNLOCK (sink);
ret = gst_clock_id_wait (sink->priv->cached_clock_id, jitter);
GST_BASE_SINK_PREROLL_LOCK (sink);
sink->clock_id = NULL;
return ret;
/* no syncing needed */
invalid_time:
{
GST_DEBUG_OBJECT (sink, "time not valid, no sync needed");
return GST_CLOCK_BADTIME;
}
no_sync:
{
GST_DEBUG_OBJECT (sink, "sync disabled");
GST_OBJECT_UNLOCK (sink);
return GST_CLOCK_BADTIME;
}
no_clock:
{
GST_DEBUG_OBJECT (sink, "no clock, can't sync");
GST_OBJECT_UNLOCK (sink);
return GST_CLOCK_BADTIME;
}
}
/**
* gst_base_sink_wait_preroll:
* @sink: the sink
*
* If the #GstBaseSinkClass.render() method performs its own synchronisation
* against the clock it must unblock when going from PLAYING to the PAUSED state
* and call this method before continuing to render the remaining data.
*
* This function will block until a state change to PLAYING happens (in which
* case this function returns #GST_FLOW_OK) or the processing must be stopped due
* to a state change to READY or a FLUSH event (in which case this function
* returns #GST_FLOW_FLUSHING).
*
* This function should only be called with the PREROLL_LOCK held, like in the
* render function.
*
* Returns: #GST_FLOW_OK if the preroll completed and processing can
* continue. Any other return value should be returned from the render vmethod.
*/
GstFlowReturn
gst_base_sink_wait_preroll (GstBaseSink * sink)
{
sink->have_preroll = TRUE;
GST_DEBUG_OBJECT (sink, "waiting in preroll for flush or PLAYING");
/* block until the state changes, or we get a flush, or something */
GST_BASE_SINK_PREROLL_WAIT (sink);
sink->have_preroll = FALSE;
if (G_UNLIKELY (sink->flushing))
goto stopping;
if (G_UNLIKELY (sink->priv->step_unlock))
goto step_unlocked;
GST_DEBUG_OBJECT (sink, "continue after preroll");
return GST_FLOW_OK;
/* ERRORS */
stopping:
{
GST_DEBUG_OBJECT (sink, "preroll interrupted because of flush");
return GST_FLOW_FLUSHING;
}
step_unlocked:
{
sink->priv->step_unlock = FALSE;
GST_DEBUG_OBJECT (sink, "preroll interrupted because of step");
return GST_FLOW_STEP;
}
}
/**
* gst_base_sink_do_preroll:
* @sink: the sink
* @obj: (transfer none): the mini object that caused the preroll
*
* If the @sink spawns its own thread for pulling buffers from upstream it
* should call this method after it has pulled a buffer. If the element needed
* to preroll, this function will perform the preroll and will then block
* until the element state is changed.
*
* This function should be called with the PREROLL_LOCK held.
*
* Returns: #GST_FLOW_OK if the preroll completed and processing can
* continue. Any other return value should be returned from the render vmethod.
*/
GstFlowReturn
gst_base_sink_do_preroll (GstBaseSink * sink, GstMiniObject * obj)
{
GstFlowReturn ret;
while (G_UNLIKELY (sink->need_preroll)) {
GST_DEBUG_OBJECT (sink, "prerolling object %p", obj);
/* if it's a buffer, we need to call the preroll method */
if (sink->priv->call_preroll) {
GstBaseSinkClass *bclass;
GstBuffer *buf;
if (GST_IS_BUFFER_LIST (obj)) {
buf = gst_buffer_list_get (GST_BUFFER_LIST_CAST (obj), 0);
g_assert (NULL != buf);
} else if (GST_IS_BUFFER (obj)) {
buf = GST_BUFFER_CAST (obj);
/* For buffer lists do not set last buffer for now */
gst_base_sink_set_last_buffer (sink, buf);
} else
buf = NULL;
if (buf) {
GST_DEBUG_OBJECT (sink, "preroll buffer %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
bclass = GST_BASE_SINK_GET_CLASS (sink);
if (bclass->prepare)
if ((ret = bclass->prepare (sink, buf)) != GST_FLOW_OK)
goto prepare_canceled;
if (bclass->preroll)
if ((ret = bclass->preroll (sink, buf)) != GST_FLOW_OK)
goto preroll_canceled;
sink->priv->call_preroll = FALSE;
}
}
/* commit state */
if (G_LIKELY (sink->playing_async)) {
if (G_UNLIKELY (!gst_base_sink_commit_state (sink)))
goto stopping;
}
/* need to recheck here because the commit state could have
* made us not need the preroll anymore */
if (G_LIKELY (sink->need_preroll)) {
/* block until the state changes, or we get a flush, or something */
ret = gst_base_sink_wait_preroll (sink);
if ((ret != GST_FLOW_OK) && (ret != GST_FLOW_STEP))
goto preroll_failed;
}
}
return GST_FLOW_OK;
/* ERRORS */
prepare_canceled:
{
GST_DEBUG_OBJECT (sink, "prepare failed, abort state");
gst_element_abort_state (GST_ELEMENT_CAST (sink));
return ret;
}
preroll_canceled:
{
GST_DEBUG_OBJECT (sink, "preroll failed, abort state");
gst_element_abort_state (GST_ELEMENT_CAST (sink));
return ret;
}
stopping:
{
GST_DEBUG_OBJECT (sink, "stopping while commiting state");
return GST_FLOW_FLUSHING;
}
preroll_failed:
{
GST_DEBUG_OBJECT (sink, "preroll failed: %s", gst_flow_get_name (ret));
return ret;
}
}
/**
* gst_base_sink_wait:
* @sink: the sink
* @time: the running_time to be reached
* @jitter: (out) (allow-none): the jitter to be filled with time diff, or NULL
*
* This function will wait for preroll to complete and will then block until @time
* is reached. It is usually called by subclasses that use their own internal
* synchronisation but want to let some synchronization (like EOS) be handled
* by the base class.
*
* This function should only be called with the PREROLL_LOCK held (like when
* receiving an EOS event in the ::event vmethod or when handling buffers in
* ::render).
*
* The @time argument should be the running_time of when the timeout should happen
* and will be adjusted with any latency and offset configured in the sink.
*
* Returns: #GstFlowReturn
*/
GstFlowReturn
gst_base_sink_wait (GstBaseSink * sink, GstClockTime time,
GstClockTimeDiff * jitter)
{
GstClockReturn status;
GstFlowReturn ret;
do {
GstClockTime stime;
GST_DEBUG_OBJECT (sink, "checking preroll");
/* first wait for the playing state before we can continue */
while (G_UNLIKELY (sink->need_preroll)) {
ret = gst_base_sink_wait_preroll (sink);
if ((ret != GST_FLOW_OK) && (ret != GST_FLOW_STEP))
goto flushing;
}
/* preroll done, we can sync since we are in PLAYING now. */
GST_DEBUG_OBJECT (sink, "possibly waiting for clock to reach %"
GST_TIME_FORMAT, GST_TIME_ARGS (time));
/* compensate for latency, ts_offset and render delay */
stime = gst_base_sink_adjust_time (sink, time);
/* wait for the clock, this can be interrupted because we got shut down or
* we PAUSED. */
status = gst_base_sink_wait_clock (sink, stime, jitter);
GST_DEBUG_OBJECT (sink, "clock returned %d", status);
/* invalid time, no clock or sync disabled, just continue then */
if (status == GST_CLOCK_BADTIME)
break;
/* waiting could have been interrupted and we can be flushing now */
if (G_UNLIKELY (sink->flushing))
goto flushing;
/* retry if we got unscheduled, which means we did not reach the timeout
* yet. if some other error occures, we continue. */
} while (status == GST_CLOCK_UNSCHEDULED);
GST_DEBUG_OBJECT (sink, "end of stream");
return GST_FLOW_OK;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (sink, "we are flushing");
return GST_FLOW_FLUSHING;
}
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Make sure we are in PLAYING and synchronize an object to the clock.
*
* If we need preroll, we are not in PLAYING. We try to commit the state
* if needed and then block if we still are not PLAYING.
*
* We start waiting on the clock in PLAYING. If we got interrupted, we
* immediately try to re-preroll.
*
* Some objects do not need synchronisation (most events) and so this function
* immediately returns GST_FLOW_OK.
*
* for objects that arrive later than max-lateness to be synchronized to the
* clock have the @late boolean set to TRUE.
*
* This function keeps a running average of the jitter (the diff between the
* clock time and the requested sync time). The jitter is negative for
* objects that arrive in time and positive for late buffers.
*
* does not take ownership of obj.
*/
static GstFlowReturn
gst_base_sink_do_sync (GstBaseSink * basesink,
GstMiniObject * obj, gboolean * late, gboolean * step_end)
{
GstClockTimeDiff jitter = 0;
gboolean syncable;
GstClockReturn status = GST_CLOCK_OK;
GstClockTime rstart, rstop, rnext, sstart, sstop, stime;
gboolean do_sync;
GstBaseSinkPrivate *priv;
GstFlowReturn ret;
GstStepInfo *current, *pending;
gboolean stepped;
priv = basesink->priv;
do_step:
sstart = sstop = rstart = rstop = rnext = GST_CLOCK_TIME_NONE;
do_sync = TRUE;
stepped = FALSE;
priv->current_rstart = GST_CLOCK_TIME_NONE;
/* get stepping info */
current = &priv->current_step;
pending = &priv->pending_step;
/* get timing information for this object against the render segment */
syncable = gst_base_sink_get_sync_times (basesink, obj,
&sstart, &sstop, &rstart, &rstop, &rnext, &do_sync, &stepped, current,
step_end);
if (G_UNLIKELY (stepped))
goto step_skipped;
/* a syncable object needs to participate in preroll and
* clocking. All buffers and EOS are syncable. */
if (G_UNLIKELY (!syncable))
goto not_syncable;
/* store timing info for current object */
priv->current_rstart = rstart;
priv->current_rstop = (GST_CLOCK_TIME_IS_VALID (rstop) ? rstop : rstart);
/* save sync time for eos when the previous object needed sync */
priv->eos_rtime = (do_sync ? rnext : GST_CLOCK_TIME_NONE);
/* calculate inter frame spacing */
if (G_UNLIKELY (priv->prev_rstart != -1 && priv->prev_rstart < rstart)) {
GstClockTime in_diff;
in_diff = rstart - priv->prev_rstart;
if (priv->avg_in_diff == -1)
priv->avg_in_diff = in_diff;
else
priv->avg_in_diff = UPDATE_RUNNING_AVG (priv->avg_in_diff, in_diff);
GST_LOG_OBJECT (basesink, "avg frame diff %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->avg_in_diff));
}
priv->prev_rstart = rstart;
if (G_UNLIKELY (priv->earliest_in_time != -1
&& rstart < priv->earliest_in_time))
goto qos_dropped;
again:
/* first do preroll, this makes sure we commit our state
* to PAUSED and can continue to PLAYING. We cannot perform
* any clock sync in PAUSED because there is no clock. */
ret = gst_base_sink_do_preroll (basesink, obj);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto preroll_failed;
/* update the segment with a pending step if the current one is invalid and we
* have a new pending one. We only accept new step updates after a preroll */
if (G_UNLIKELY (pending->valid && !current->valid)) {
start_stepping (basesink, &basesink->segment, pending, current);
goto do_step;
}
/* After rendering we store the position of the last buffer so that we can use
* it to report the position. We need to take the lock here. */
GST_OBJECT_LOCK (basesink);
priv->current_sstart = sstart;
priv->current_sstop = (GST_CLOCK_TIME_IS_VALID (sstop) ? sstop : sstart);
GST_OBJECT_UNLOCK (basesink);
if (!do_sync)
goto done;
/* adjust for latency */
stime = gst_base_sink_adjust_time (basesink, rstart);
/* adjust for rate control */
if (priv->rc_next == -1 || (stime != -1 && stime >= priv->rc_next)) {
GST_DEBUG_OBJECT (basesink, "reset rc_time to time %" GST_TIME_FORMAT,
GST_TIME_ARGS (stime));
priv->rc_time = stime;
priv->rc_accumulated = 0;
} else {
GST_DEBUG_OBJECT (basesink, "rate control next %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->rc_next));
stime = priv->rc_next;
}
/* preroll done, we can sync since we are in PLAYING now. */
GST_DEBUG_OBJECT (basesink, "possibly waiting for clock to reach %"
GST_TIME_FORMAT ", adjusted %" GST_TIME_FORMAT,
GST_TIME_ARGS (rstart), GST_TIME_ARGS (stime));
/* This function will return immediately if start == -1, no clock
* or sync is disabled with GST_CLOCK_BADTIME. */
status = gst_base_sink_wait_clock (basesink, stime, &jitter);
GST_DEBUG_OBJECT (basesink, "clock returned %d, jitter %c%" GST_TIME_FORMAT,
status, (jitter < 0 ? '-' : ' '), GST_TIME_ARGS (ABS (jitter)));
/* invalid time, no clock or sync disabled, just render */
if (status == GST_CLOCK_BADTIME)
goto done;
/* waiting could have been interrupted and we can be flushing now */
if (G_UNLIKELY (basesink->flushing))
goto flushing;
/* check for unlocked by a state change, we are not flushing so
* we can try to preroll on the current buffer. */
if (G_UNLIKELY (status == GST_CLOCK_UNSCHEDULED)) {
GST_DEBUG_OBJECT (basesink, "unscheduled, waiting some more");
priv->call_preroll = TRUE;
goto again;
}
/* successful syncing done, record observation */
priv->current_jitter = jitter;
/* check if the object should be dropped */
*late = gst_base_sink_is_too_late (basesink, obj, rstart, rstop,
status, jitter, TRUE);
done:
return GST_FLOW_OK;
/* ERRORS */
step_skipped:
{
GST_DEBUG_OBJECT (basesink, "skipped stepped object %p", obj);
*late = TRUE;
return GST_FLOW_OK;
}
not_syncable:
{
GST_DEBUG_OBJECT (basesink, "non syncable object %p", obj);
return GST_FLOW_OK;
}
qos_dropped:
{
GST_DEBUG_OBJECT (basesink, "dropped because of QoS %p", obj);
*late = TRUE;
return GST_FLOW_OK;
}
flushing:
{
GST_DEBUG_OBJECT (basesink, "we are flushing");
return GST_FLOW_FLUSHING;
}
preroll_failed:
{
GST_DEBUG_OBJECT (basesink, "preroll failed");
*step_end = FALSE;
return ret;
}
}
static gboolean
gst_base_sink_send_qos (GstBaseSink * basesink, GstQOSType type,
gdouble proportion, GstClockTime time, GstClockTimeDiff diff)
{
GstEvent *event;
gboolean res;
/* generate Quality-of-Service event */
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
"qos: type %d, proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
GST_TIME_FORMAT, type, proportion, diff, GST_TIME_ARGS (time));
event = gst_event_new_qos (type, proportion, diff, time);
/* send upstream */
res = gst_pad_push_event (basesink->sinkpad, event);
return res;
}
static void
gst_base_sink_perform_qos (GstBaseSink * sink, gboolean dropped)
{
GstBaseSinkPrivate *priv;
GstClockTime start, stop;
GstClockTimeDiff jitter;
GstClockTime pt, entered, left;
GstClockTime duration;
gdouble rate;
priv = sink->priv;
start = priv->current_rstart;
if (priv->current_step.valid)
return;
/* if Quality-of-Service disabled, do nothing */
if (!g_atomic_int_get (&priv->qos_enabled) ||
!GST_CLOCK_TIME_IS_VALID (start))
return;
stop = priv->current_rstop;
jitter = priv->current_jitter;
if (jitter < 0) {
/* this is the time the buffer entered the sink */
if (start < -jitter)
entered = 0;
else
entered = start + jitter;
left = start;
} else {
/* this is the time the buffer entered the sink */
entered = start + jitter;
/* this is the time the buffer left the sink */
left = start + jitter;
}
/* calculate duration of the buffer */
if (GST_CLOCK_TIME_IS_VALID (stop) && stop != start)
duration = stop - start;
else
duration = priv->avg_in_diff;
/* if we have the time when the last buffer left us, calculate
* processing time */
if (GST_CLOCK_TIME_IS_VALID (priv->last_left)) {
if (entered > priv->last_left) {
pt = entered - priv->last_left;
} else {
pt = 0;
}
} else {
pt = priv->avg_pt;
}
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, sink, "start: %" GST_TIME_FORMAT
", stop %" GST_TIME_FORMAT ", entered %" GST_TIME_FORMAT ", left %"
GST_TIME_FORMAT ", pt: %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
",jitter %" G_GINT64_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (stop),
GST_TIME_ARGS (entered), GST_TIME_ARGS (left), GST_TIME_ARGS (pt),
GST_TIME_ARGS (duration), jitter);
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, sink, "avg_duration: %" GST_TIME_FORMAT
", avg_pt: %" GST_TIME_FORMAT ", avg_rate: %g",
GST_TIME_ARGS (priv->avg_duration), GST_TIME_ARGS (priv->avg_pt),
priv->avg_rate);
/* collect running averages. for first observations, we copy the
* values */
if (!GST_CLOCK_TIME_IS_VALID (priv->avg_duration))
priv->avg_duration = duration;
else
priv->avg_duration = UPDATE_RUNNING_AVG (priv->avg_duration, duration);
if (!GST_CLOCK_TIME_IS_VALID (priv->avg_pt))
priv->avg_pt = pt;
else
priv->avg_pt = UPDATE_RUNNING_AVG (priv->avg_pt, pt);
if (priv->avg_duration != 0)
rate =
gst_guint64_to_gdouble (priv->avg_pt) /
gst_guint64_to_gdouble (priv->avg_duration);
else
rate = 1.0;
if (GST_CLOCK_TIME_IS_VALID (priv->last_left)) {
if (dropped || priv->avg_rate < 0.0) {
priv->avg_rate = rate;
} else {
if (rate > 1.0)
priv->avg_rate = UPDATE_RUNNING_AVG_N (priv->avg_rate, rate);
else
priv->avg_rate = UPDATE_RUNNING_AVG_P (priv->avg_rate, rate);
}
}
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, sink,
"updated: avg_duration: %" GST_TIME_FORMAT ", avg_pt: %" GST_TIME_FORMAT
", avg_rate: %g", GST_TIME_ARGS (priv->avg_duration),
GST_TIME_ARGS (priv->avg_pt), priv->avg_rate);
if (priv->avg_rate >= 0.0) {
GstQOSType type;
GstClockTimeDiff diff;
/* if we have a valid rate, start sending QoS messages */
if (priv->current_jitter < 0) {
/* make sure we never go below 0 when adding the jitter to the
* timestamp. */
if (priv->current_rstart < -priv->current_jitter)
priv->current_jitter = -priv->current_rstart;
}
if (priv->throttle_time > 0) {
diff = priv->throttle_time;
type = GST_QOS_TYPE_THROTTLE;
} else {
diff = priv->current_jitter;
if (diff <= 0)
type = GST_QOS_TYPE_OVERFLOW;
else
type = GST_QOS_TYPE_UNDERFLOW;
}
gst_base_sink_send_qos (sink, type, priv->avg_rate, priv->current_rstart,
diff);
}
/* record when this buffer will leave us */
priv->last_left = left;
}
/* reset all qos measuring */
static void
gst_base_sink_reset_qos (GstBaseSink * sink)
{
GstBaseSinkPrivate *priv;
priv = sink->priv;
priv->last_render_time = GST_CLOCK_TIME_NONE;
priv->prev_rstart = GST_CLOCK_TIME_NONE;
priv->earliest_in_time = GST_CLOCK_TIME_NONE;
priv->last_left = GST_CLOCK_TIME_NONE;
priv->avg_duration = GST_CLOCK_TIME_NONE;
priv->avg_pt = GST_CLOCK_TIME_NONE;
priv->avg_rate = -1.0;
priv->avg_render = GST_CLOCK_TIME_NONE;
priv->avg_in_diff = GST_CLOCK_TIME_NONE;
priv->rendered = 0;
priv->dropped = 0;
}
/* Checks if the object was scheduled too late.
*
* rstart/rstop contain the running_time start and stop values
* of the object.
*
* status and jitter contain the return values from the clock wait.
*
* returns TRUE if the buffer was too late.
*/
static gboolean
gst_base_sink_is_too_late (GstBaseSink * basesink, GstMiniObject * obj,
GstClockTime rstart, GstClockTime rstop,
GstClockReturn status, GstClockTimeDiff jitter, gboolean render)
{
gboolean late;
guint64 max_lateness;
GstBaseSinkPrivate *priv;
priv = basesink->priv;
late = FALSE;
/* only for objects that were too late */
if (G_LIKELY (status != GST_CLOCK_EARLY))
goto in_time;
max_lateness = basesink->max_lateness;
/* check if frame dropping is enabled */
if (max_lateness == -1)
goto no_drop;
/* only check for buffers */
if (G_UNLIKELY (!GST_IS_BUFFER (obj)))
goto not_buffer;
/* can't do check if we don't have a timestamp */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (rstart)))
goto no_timestamp;
/* we can add a valid stop time */
if (GST_CLOCK_TIME_IS_VALID (rstop))
max_lateness += rstop;
else {
max_lateness += rstart;
/* no stop time, use avg frame diff */
if (priv->avg_in_diff != -1)
max_lateness += priv->avg_in_diff;
}
/* if the jitter bigger than duration and lateness we are too late */
if ((late = rstart + jitter > max_lateness)) {
GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, basesink,
"buffer is too late %" GST_TIME_FORMAT
" > %" GST_TIME_FORMAT, GST_TIME_ARGS (rstart + jitter),
GST_TIME_ARGS (max_lateness));
/* !!emergency!!, if we did not receive anything valid for more than a
* second, render it anyway so the user sees something */
if (GST_CLOCK_TIME_IS_VALID (priv->last_render_time) &&
rstart - priv->last_render_time > GST_SECOND) {
late = FALSE;
GST_ELEMENT_WARNING (basesink, CORE, CLOCK,
(_("A lot of buffers are being dropped.")),
("There may be a timestamping problem, or this computer is too slow."));
GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, basesink,
"**emergency** last buffer at %" GST_TIME_FORMAT " > GST_SECOND",
GST_TIME_ARGS (priv->last_render_time));
}
}
done:
if (render && (!late || !GST_CLOCK_TIME_IS_VALID (priv->last_render_time))) {
priv->last_render_time = rstart;
/* the next allowed input timestamp */
if (priv->throttle_time > 0)
priv->earliest_in_time = rstart + priv->throttle_time;
}
return late;
/* all is fine */
in_time:
{
GST_DEBUG_OBJECT (basesink, "object was scheduled in time");
goto done;
}
no_drop:
{
GST_DEBUG_OBJECT (basesink, "frame dropping disabled");
goto done;
}
not_buffer:
{
GST_DEBUG_OBJECT (basesink, "object is not a buffer");
return FALSE;
}
no_timestamp:
{
GST_DEBUG_OBJECT (basesink, "buffer has no timestamp");
return FALSE;
}
}
/* called before and after calling the render vmethod. It keeps track of how
* much time was spent in the render method and is used to check if we are
* flooded */
static void
gst_base_sink_do_render_stats (GstBaseSink * basesink, gboolean start)
{
GstBaseSinkPrivate *priv;
priv = basesink->priv;
if (start) {
priv->start = gst_util_get_timestamp ();
} else {
GstClockTime elapsed;
priv->stop = gst_util_get_timestamp ();
elapsed = GST_CLOCK_DIFF (priv->start, priv->stop);
if (!GST_CLOCK_TIME_IS_VALID (priv->avg_render))
priv->avg_render = elapsed;
else
priv->avg_render = UPDATE_RUNNING_AVG (priv->avg_render, elapsed);
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
"avg_render: %" GST_TIME_FORMAT, GST_TIME_ARGS (priv->avg_render));
}
}
static void
gst_base_sink_flush_start (GstBaseSink * basesink, GstPad * pad)
{
/* make sure we are not blocked on the clock also clear any pending
* eos state. */
gst_base_sink_set_flushing (basesink, pad, TRUE);
/* we grab the stream lock but that is not needed since setting the
* sink to flushing would make sure no state commit is being done
* anymore */
GST_PAD_STREAM_LOCK (pad);
gst_base_sink_reset_qos (basesink);
/* and we need to commit our state again on the next
* prerolled buffer */
basesink->playing_async = TRUE;
if (basesink->priv->async_enabled) {
gst_element_lost_state (GST_ELEMENT_CAST (basesink));
} else {
/* start time reset in above case as well;
* arranges for a.o. proper position reporting when flushing in PAUSED */
gst_element_set_start_time (GST_ELEMENT_CAST (basesink), 0);
basesink->priv->have_latency = TRUE;
}
gst_base_sink_set_last_buffer (basesink, NULL);
GST_PAD_STREAM_UNLOCK (pad);
}
static void
gst_base_sink_flush_stop (GstBaseSink * basesink, GstPad * pad,
gboolean reset_time)
{
/* unset flushing so we can accept new data, this also flushes out any EOS
* event. */
gst_base_sink_set_flushing (basesink, pad, FALSE);
/* for position reporting */
GST_OBJECT_LOCK (basesink);
basesink->priv->current_sstart = GST_CLOCK_TIME_NONE;
basesink->priv->current_sstop = GST_CLOCK_TIME_NONE;
basesink->priv->eos_rtime = GST_CLOCK_TIME_NONE;
basesink->priv->call_preroll = TRUE;
basesink->priv->current_step.valid = FALSE;
basesink->priv->pending_step.valid = FALSE;
if (basesink->pad_mode == GST_PAD_MODE_PUSH) {
/* we need new segment info after the flush. */
basesink->have_newsegment = FALSE;
if (reset_time) {
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
GST_ELEMENT_START_TIME (basesink) = 0;
}
}
GST_OBJECT_UNLOCK (basesink);
if (reset_time) {
GST_DEBUG_OBJECT (basesink, "posting reset-time message");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_reset_time (GST_OBJECT_CAST (basesink), 0));
}
}
static GstFlowReturn
gst_base_sink_default_wait_event (GstBaseSink * basesink, GstEvent * event)
{
GstFlowReturn ret;
gboolean late, step_end = FALSE;
ret = gst_base_sink_do_sync (basesink, GST_MINI_OBJECT_CAST (event),
&late, &step_end);
return ret;
}
static GstFlowReturn
gst_base_sink_wait_event (GstBaseSink * basesink, GstEvent * event)
{
GstFlowReturn ret;
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (G_LIKELY (bclass->wait_event))
ret = bclass->wait_event (basesink, event);
else
ret = GST_FLOW_NOT_SUPPORTED;
return ret;
}
static gboolean
gst_base_sink_default_event (GstBaseSink * basesink, GstEvent * event)
{
gboolean result = TRUE;
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
{
GST_DEBUG_OBJECT (basesink, "flush-start %p", event);
gst_base_sink_flush_start (basesink, basesink->sinkpad);
break;
}
case GST_EVENT_FLUSH_STOP:
{
gboolean reset_time;
gst_event_parse_flush_stop (event, &reset_time);
GST_DEBUG_OBJECT (basesink, "flush-stop %p, reset_time: %d", event,
reset_time);
gst_base_sink_flush_stop (basesink, basesink->sinkpad, reset_time);
break;
}
case GST_EVENT_EOS:
{
GstMessage *message;
guint32 seqnum;
/* we set the received EOS flag here so that we can use it when testing if
* we are prerolled and to refuse more buffers. */
basesink->priv->received_eos = TRUE;
/* wait for EOS */
if (G_UNLIKELY (gst_base_sink_wait_event (basesink,
event) != GST_FLOW_OK)) {
result = FALSE;
goto done;
}
/* the EOS event is completely handled so we mark
* ourselves as being in the EOS state. eos is also
* protected by the object lock so we can read it when
* answering the POSITION query. */
GST_OBJECT_LOCK (basesink);
basesink->eos = TRUE;
GST_OBJECT_UNLOCK (basesink);
/* ok, now we can post the message */
GST_DEBUG_OBJECT (basesink, "Now posting EOS");
seqnum = basesink->priv->seqnum = gst_event_get_seqnum (event);
GST_DEBUG_OBJECT (basesink, "Got seqnum #%" G_GUINT32_FORMAT, seqnum);
message = gst_message_new_eos (GST_OBJECT_CAST (basesink));
gst_message_set_seqnum (message, seqnum);
gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
break;
}
case GST_EVENT_STREAM_START:
{
GstMessage *message;
guint32 seqnum;
seqnum = gst_event_get_seqnum (event);
GST_DEBUG_OBJECT (basesink, "Now posting STREAM_START (seqnum:%d)",
seqnum);
message = gst_message_new_stream_start (GST_OBJECT_CAST (basesink));
gst_message_set_seqnum (message, seqnum);
gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
break;
}
case GST_EVENT_CAPS:
{
GstCaps *caps;
GST_DEBUG_OBJECT (basesink, "caps %p", event);
gst_event_parse_caps (event, &caps);
if (bclass->set_caps)
result = bclass->set_caps (basesink, caps);
if (result) {
GST_OBJECT_LOCK (basesink);
gst_caps_replace (&basesink->priv->caps, caps);
GST_OBJECT_UNLOCK (basesink);
}
break;
}
case GST_EVENT_SEGMENT:
/* configure the segment */
/* The segment is protected with both the STREAM_LOCK and the OBJECT_LOCK.
* We protect with the OBJECT_LOCK so that we can use the values to
* safely answer a POSITION query. */
GST_OBJECT_LOCK (basesink);
/* the newsegment event is needed to bring the buffer timestamps to the
* stream time and to drop samples outside of the playback segment. */
gst_event_copy_segment (event, &basesink->segment);
GST_DEBUG_OBJECT (basesink, "configured segment %" GST_SEGMENT_FORMAT,
&basesink->segment);
basesink->have_newsegment = TRUE;
GST_OBJECT_UNLOCK (basesink);
break;
case GST_EVENT_GAP:
{
if (G_UNLIKELY (gst_base_sink_wait_event (basesink,
event) != GST_FLOW_OK))
result = FALSE;
break;
}
case GST_EVENT_TAG:
{
GstTagList *taglist;
gst_event_parse_tag (event, &taglist);
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_tag (GST_OBJECT_CAST (basesink),
gst_tag_list_copy (taglist)));
break;
}
case GST_EVENT_TOC:
{
GstToc *toc;
gboolean updated;
gst_event_parse_toc (event, &toc, &updated);
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_toc (GST_OBJECT_CAST (basesink), toc, updated));
gst_toc_unref (toc);
break;
}
case GST_EVENT_SINK_MESSAGE:
{
GstMessage *msg = NULL;
gst_event_parse_sink_message (event, &msg);
if (msg)
gst_element_post_message (GST_ELEMENT_CAST (basesink), msg);
break;
}
default:
break;
}
done:
gst_event_unref (event);
return result;
}
static gboolean
gst_base_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstBaseSink *basesink;
gboolean result = TRUE;
GstBaseSinkClass *bclass;
basesink = GST_BASE_SINK_CAST (parent);
bclass = GST_BASE_SINK_GET_CLASS (basesink);
GST_DEBUG_OBJECT (basesink, "received event %p %" GST_PTR_FORMAT, event,
event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
/* special case for this serialized event because we don't want to grab
* the PREROLL lock or check if we were flushing */
if (bclass->event)
result = bclass->event (basesink, event);
break;
default:
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_BASE_SINK_PREROLL_LOCK (basesink);
if (G_UNLIKELY (basesink->flushing))
goto flushing;
if (G_UNLIKELY (basesink->priv->received_eos))
goto after_eos;
if (bclass->event)
result = bclass->event (basesink, event);
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
} else {
if (bclass->event)
result = bclass->event (basesink, event);
}
break;
}
done:
return result;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (basesink, "we are flushing");
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
gst_event_unref (event);
result = FALSE;
goto done;
}
after_eos:
{
GST_DEBUG_OBJECT (basesink, "Event received after EOS, dropping");
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
gst_event_unref (event);
result = FALSE;
goto done;
}
}
/* default implementation to calculate the start and end
* timestamps on a buffer, subclasses can override
*/
static void
gst_base_sink_default_get_times (GstBaseSink * basesink, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end)
{
GstClockTime timestamp, duration;
/* first sync on DTS, else use PTS */
timestamp = GST_BUFFER_DTS (buffer);
if (!GST_CLOCK_TIME_IS_VALID (timestamp))
timestamp = GST_BUFFER_PTS (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* get duration to calculate end time */
duration = GST_BUFFER_DURATION (buffer);
if (GST_CLOCK_TIME_IS_VALID (duration)) {
*end = timestamp + duration;
}
*start = timestamp;
}
}
/* must be called with PREROLL_LOCK */
static gboolean
gst_base_sink_needs_preroll (GstBaseSink * basesink)
{
gboolean is_prerolled, res;
/* we have 2 cases where the PREROLL_LOCK is released:
* 1) we are blocking in the PREROLL_LOCK and thus are prerolled.
* 2) we are syncing on the clock
*/
is_prerolled = basesink->have_preroll || basesink->priv->received_eos;
res = !is_prerolled;
GST_DEBUG_OBJECT (basesink, "have_preroll: %d, EOS: %d => needs preroll: %d",
basesink->have_preroll, basesink->priv->received_eos, res);
return res;
}
static gboolean
count_list_bytes (GstBuffer ** buffer, guint idx, GstBaseSinkPrivate * priv)
{
priv->rc_accumulated += gst_buffer_get_size (*buffer);
return TRUE;
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Takes a buffer and compare the timestamps with the last segment.
* If the buffer falls outside of the segment boundaries, drop it.
* Else send the buffer for preroll and rendering.
*
* This function takes ownership of the buffer.
*/
static GstFlowReturn
gst_base_sink_chain_unlocked (GstBaseSink * basesink, GstPad * pad,
gpointer obj, gboolean is_list)
{
GstBaseSinkClass *bclass;
GstBaseSinkPrivate *priv = basesink->priv;
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime start = GST_CLOCK_TIME_NONE, end = GST_CLOCK_TIME_NONE;
GstSegment *segment;
GstBuffer *sync_buf;
gint do_qos;
gboolean late, step_end;
if (G_UNLIKELY (basesink->flushing))
goto flushing;
if (G_UNLIKELY (priv->received_eos))
goto was_eos;
if (is_list) {
sync_buf = gst_buffer_list_get (GST_BUFFER_LIST_CAST (obj), 0);
g_assert (NULL != sync_buf);
} else {
sync_buf = GST_BUFFER_CAST (obj);
}
/* for code clarity */
segment = &basesink->segment;
if (G_UNLIKELY (!basesink->have_newsegment)) {
gboolean sync;
sync = gst_base_sink_get_sync (basesink);
if (sync) {
GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
(_("Internal data flow problem.")),
("Received buffer without a new-segment. Assuming timestamps start from 0."));
}
/* this means this sink will assume timestamps start from 0 */
GST_OBJECT_LOCK (basesink);
segment->start = 0;
segment->stop = -1;
basesink->segment.start = 0;
basesink->segment.stop = -1;
basesink->have_newsegment = TRUE;
GST_OBJECT_UNLOCK (basesink);
}
bclass = GST_BASE_SINK_GET_CLASS (basesink);
/* check if the buffer needs to be dropped, we first ask the subclass for the
* start and end */
if (bclass->get_times)
bclass->get_times (basesink, sync_buf, &start, &end);
if (!GST_CLOCK_TIME_IS_VALID (start)) {
/* if the subclass does not want sync, we use our own values so that we at
* least clip the buffer to the segment */
gst_base_sink_default_get_times (basesink, sync_buf, &start, &end);
}
GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (end));
/* a dropped buffer does not participate in anything */
if (GST_CLOCK_TIME_IS_VALID (start) && (segment->format == GST_FORMAT_TIME)) {
if (G_UNLIKELY (!gst_segment_clip (segment,
GST_FORMAT_TIME, start, end, NULL, NULL)))
goto out_of_segment;
}
if (bclass->prepare || bclass->prepare_list) {
gboolean late = FALSE;
gboolean do_sync = TRUE, stepped = FALSE, step_end = FALSE, syncable = TRUE;
GstClockTime sstart, sstop, rstart, rstop, rnext;
GstStepInfo *current;
current = &priv->current_step;
syncable =
gst_base_sink_get_sync_times (basesink, obj, &sstart, &sstop, &rstart,
&rstop, &rnext, &do_sync, &stepped, current, &step_end);
if (!stepped && syncable && do_sync)
late =
gst_base_sink_is_too_late (basesink, obj, rstart, rstop,
GST_CLOCK_EARLY, 0, FALSE);
if (late)
goto dropped;
if (!is_list) {
if (bclass->prepare) {
ret = bclass->prepare (basesink, GST_BUFFER_CAST (obj));
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto prepare_failed;
}
} else {
if (bclass->prepare_list) {
ret = bclass->prepare_list (basesink, GST_BUFFER_LIST_CAST (obj));
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto prepare_failed;
}
}
}
again:
late = FALSE;
step_end = FALSE;
/* synchronize this object, non syncable objects return OK
* immediately. */
ret = gst_base_sink_do_sync (basesink, GST_MINI_OBJECT_CAST (sync_buf),
&late, &step_end);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto sync_failed;
/* drop late buffers unconditionally, let's hope it's unlikely */
if (G_UNLIKELY (late))
goto dropped;
if (priv->max_bitrate) {
if (is_list) {
gst_buffer_list_foreach (GST_BUFFER_LIST_CAST (obj),
(GstBufferListFunc) count_list_bytes, priv);
} else {
priv->rc_accumulated += gst_buffer_get_size (GST_BUFFER_CAST (obj));
}
priv->rc_next = priv->rc_time + gst_util_uint64_scale (priv->rc_accumulated,
8 * GST_SECOND, priv->max_bitrate);
}
/* read once, to get same value before and after */
do_qos = g_atomic_int_get (&priv->qos_enabled);
GST_DEBUG_OBJECT (basesink, "rendering object %p", obj);
/* record rendering time for QoS and stats */
if (do_qos)
gst_base_sink_do_render_stats (basesink, TRUE);
if (!is_list) {
/* For buffer lists do not set last buffer for now. */
gst_base_sink_set_last_buffer (basesink, GST_BUFFER_CAST (obj));
if (bclass->render)
ret = bclass->render (basesink, GST_BUFFER_CAST (obj));
} else {
if (bclass->render_list)
ret = bclass->render_list (basesink, GST_BUFFER_LIST_CAST (obj));
}
if (do_qos)
gst_base_sink_do_render_stats (basesink, FALSE);
if (ret == GST_FLOW_STEP)
goto again;
if (G_UNLIKELY (basesink->flushing))
goto flushing;
priv->rendered++;
done:
if (step_end) {
/* the step ended, check if we need to activate a new step */
GST_DEBUG_OBJECT (basesink, "step ended");
stop_stepping (basesink, &basesink->segment, &priv->current_step,
priv->current_rstart, priv->current_rstop, basesink->eos);
goto again;
}
gst_base_sink_perform_qos (basesink, late);
GST_DEBUG_OBJECT (basesink, "object unref after render %p", obj);
gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
return ret;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (basesink, "sink is flushing");
gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
return GST_FLOW_FLUSHING;
}
was_eos:
{
GST_DEBUG_OBJECT (basesink, "we are EOS, dropping object, return EOS");
gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
return GST_FLOW_EOS;
}
out_of_segment:
{
GST_DEBUG_OBJECT (basesink, "dropping buffer, out of clipping segment");
gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
return GST_FLOW_OK;
}
prepare_failed:
{
GST_DEBUG_OBJECT (basesink, "prepare buffer failed %s",
gst_flow_get_name (ret));
gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
return ret;
}
sync_failed:
{
GST_DEBUG_OBJECT (basesink, "do_sync returned %s", gst_flow_get_name (ret));
goto done;
}
dropped:
{
priv->dropped++;
GST_DEBUG_OBJECT (basesink, "buffer late, dropping");
if (g_atomic_int_get (&priv->qos_enabled)) {
GstMessage *qos_msg;
GstClockTime timestamp, duration;
timestamp = GST_BUFFER_TIMESTAMP (GST_BUFFER_CAST (sync_buf));
duration = GST_BUFFER_DURATION (GST_BUFFER_CAST (sync_buf));
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
"qos: dropped buffer rt %" GST_TIME_FORMAT ", st %" GST_TIME_FORMAT
", ts %" GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->current_rstart),
GST_TIME_ARGS (priv->current_sstart), GST_TIME_ARGS (timestamp),
GST_TIME_ARGS (duration));
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
"qos: rendered %" G_GUINT64_FORMAT ", dropped %" G_GUINT64_FORMAT,
priv->rendered, priv->dropped);
qos_msg =
gst_message_new_qos (GST_OBJECT_CAST (basesink), basesink->sync,
priv->current_rstart, priv->current_sstart, timestamp, duration);
gst_message_set_qos_values (qos_msg, priv->current_jitter, priv->avg_rate,
1000000);
gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS, priv->rendered,
priv->dropped);
gst_element_post_message (GST_ELEMENT_CAST (basesink), qos_msg);
}
goto done;
}
}
/* with STREAM_LOCK
*/
static GstFlowReturn
gst_base_sink_chain_main (GstBaseSink * basesink, GstPad * pad, gpointer obj,
gboolean is_list)
{
GstFlowReturn result;
if (G_UNLIKELY (basesink->pad_mode != GST_PAD_MODE_PUSH))
goto wrong_mode;
GST_BASE_SINK_PREROLL_LOCK (basesink);
result = gst_base_sink_chain_unlocked (basesink, pad, obj, is_list);
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
done:
return result;
/* ERRORS */
wrong_mode:
{
GST_OBJECT_LOCK (pad);
GST_WARNING_OBJECT (basesink,
"Push on pad %s:%s, but it was not activated in push mode",
GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_UNLOCK (pad);
gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
/* we don't post an error message this will signal to the peer
* pushing that EOS is reached. */
result = GST_FLOW_EOS;
goto done;
}
}
static GstFlowReturn
gst_base_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstBaseSink *basesink;
basesink = GST_BASE_SINK (parent);
return gst_base_sink_chain_main (basesink, pad, buf, FALSE);
}
static GstFlowReturn
gst_base_sink_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * list)
{
GstBaseSink *basesink;
GstBaseSinkClass *bclass;
GstFlowReturn result;
basesink = GST_BASE_SINK (parent);
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (G_LIKELY (bclass->render_list)) {
result = gst_base_sink_chain_main (basesink, pad, list, TRUE);
} else {
guint i, len;
GstBuffer *buffer;
GST_INFO_OBJECT (pad, "chaining each buffer in list");
len = gst_buffer_list_length (list);
result = GST_FLOW_OK;
for (i = 0; i < len; i++) {
buffer = gst_buffer_list_get (list, i);
result = gst_base_sink_chain_main (basesink, pad,
gst_buffer_ref (buffer), FALSE);
if (result != GST_FLOW_OK)
break;
}
gst_buffer_list_unref (list);
}
return result;
}
static gboolean
gst_base_sink_default_do_seek (GstBaseSink * sink, GstSegment * segment)
{
gboolean res = TRUE;
/* update our offset if the start/stop position was updated */
if (segment->format == GST_FORMAT_BYTES) {
segment->time = segment->start;
} else if (segment->start == 0) {
/* seek to start, we can implement a default for this. */
segment->time = 0;
} else {
res = FALSE;
GST_INFO_OBJECT (sink, "Can't do a default seek");
}
return res;
}
#define SEEK_TYPE_IS_RELATIVE(t) (((t) != GST_SEEK_TYPE_NONE) && ((t) != GST_SEEK_TYPE_SET))
static gboolean
gst_base_sink_default_prepare_seek_segment (GstBaseSink * sink,
GstEvent * event, GstSegment * segment)
{
/* By default, we try one of 2 things:
* - For absolute seek positions, convert the requested position to our
* configured processing format and place it in the output segment \
* - For relative seek positions, convert our current (input) values to the
* seek format, adjust by the relative seek offset and then convert back to
* the processing format
*/
GstSeekType start_type, stop_type;
gint64 start, stop;
GstSeekFlags flags;
GstFormat seek_format;
gdouble rate;
gboolean update;
gboolean res = TRUE;
gst_event_parse_seek (event, &rate, &seek_format, &flags,
&start_type, &start, &stop_type, &stop);
if (seek_format == segment->format) {
gst_segment_do_seek (segment, rate, seek_format, flags,
start_type, start, stop_type, stop, &update);
return TRUE;
}
if (start_type != GST_SEEK_TYPE_NONE) {
/* FIXME: Handle seek_end by converting the input segment vals */
res =
gst_pad_query_convert (sink->sinkpad, seek_format, start,
segment->format, &start);
start_type = GST_SEEK_TYPE_SET;
}
if (res && stop_type != GST_SEEK_TYPE_NONE) {
/* FIXME: Handle seek_end by converting the input segment vals */
res =
gst_pad_query_convert (sink->sinkpad, seek_format, stop,
segment->format, &stop);
stop_type = GST_SEEK_TYPE_SET;
}
/* And finally, configure our output segment in the desired format */
gst_segment_do_seek (segment, rate, segment->format, flags, start_type, start,
stop_type, stop, &update);
if (!res)
goto no_format;
return res;
no_format:
{
GST_DEBUG_OBJECT (sink, "undefined format given, seek aborted.");
return FALSE;
}
}
/* perform a seek, only executed in pull mode */
static gboolean
gst_base_sink_perform_seek (GstBaseSink * sink, GstPad * pad, GstEvent * event)
{
gboolean flush;
gdouble rate;
GstFormat seek_format, dest_format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gboolean seekseg_configured = FALSE;
gint64 start, stop;
gboolean update, res = TRUE;
GstSegment seeksegment;
dest_format = sink->segment.format;
if (event) {
GST_DEBUG_OBJECT (sink, "performing seek with event %p", event);
gst_event_parse_seek (event, &rate, &seek_format, &flags,
&start_type, &start, &stop_type, &stop);
flush = flags & GST_SEEK_FLAG_FLUSH;
} else {
GST_DEBUG_OBJECT (sink, "performing seek without event");
flush = FALSE;
}
if (flush) {
GST_DEBUG_OBJECT (sink, "flushing upstream");
gst_pad_push_event (pad, gst_event_new_flush_start ());
gst_base_sink_flush_start (sink, pad);
} else {
GST_DEBUG_OBJECT (sink, "pausing pulling thread");
}
GST_PAD_STREAM_LOCK (pad);
/* If we configured the seeksegment above, don't overwrite it now. Otherwise
* copy the current segment info into the temp segment that we can actually
* attempt the seek with. We only update the real segment if the seek succeeds. */
if (!seekseg_configured) {
memcpy (&seeksegment, &sink->segment, sizeof (GstSegment));
/* now configure the final seek segment */
if (event) {
if (sink->segment.format != seek_format) {
/* OK, here's where we give the subclass a chance to convert the relative
* seek into an absolute one in the processing format. We set up any
* absolute seek above, before taking the stream lock. */
if (!gst_base_sink_default_prepare_seek_segment (sink, event,
&seeksegment)) {
GST_DEBUG_OBJECT (sink,
"Preparing the seek failed after flushing. " "Aborting seek");
res = FALSE;
}
} else {
/* The seek format matches our processing format, no need to ask the
* the subclass to configure the segment. */
gst_segment_do_seek (&seeksegment, rate, seek_format, flags,
start_type, start, stop_type, stop, &update);
}
}
/* Else, no seek event passed, so we're just (re)starting the
current segment. */
}
if (res) {
GST_DEBUG_OBJECT (sink, "segment configured from %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
seeksegment.start, seeksegment.stop, seeksegment.position);
/* do the seek, segment.position contains the new position. */
res = gst_base_sink_default_do_seek (sink, &seeksegment);
}
if (flush) {
GST_DEBUG_OBJECT (sink, "stop flushing upstream");
gst_pad_push_event (pad, gst_event_new_flush_stop (TRUE));
gst_base_sink_flush_stop (sink, pad, TRUE);
} else if (res && sink->running) {
/* we are running the current segment and doing a non-flushing seek,
* close the segment first based on the position. */
GST_DEBUG_OBJECT (sink, "closing running segment %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT, sink->segment.start, sink->segment.position);
}
/* The subclass must have converted the segment to the processing format
* by now */
if (res && seeksegment.format != dest_format) {
GST_DEBUG_OBJECT (sink, "Subclass failed to prepare a seek segment "
"in the correct format. Aborting seek.");
res = FALSE;
}
GST_INFO_OBJECT (sink, "seeking done %d: %" GST_SEGMENT_FORMAT, res,
&seeksegment);
/* if successful seek, we update our real segment and push
* out the new segment. */
if (res) {
gst_segment_copy_into (&seeksegment, &sink->segment);
if (sink->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT (sink),
gst_message_new_segment_start (GST_OBJECT (sink),
sink->segment.format, sink->segment.position));
}
}
sink->priv->discont = TRUE;
sink->running = TRUE;
GST_PAD_STREAM_UNLOCK (pad);
return res;
}
static void
set_step_info (GstBaseSink * sink, GstStepInfo * current, GstStepInfo * pending,
guint seqnum, GstFormat format, guint64 amount, gdouble rate,
gboolean flush, gboolean intermediate)
{
GST_OBJECT_LOCK (sink);
pending->seqnum = seqnum;
pending->format = format;
pending->amount = amount;
pending->position = 0;
pending->rate = rate;
pending->flush = flush;
pending->intermediate = intermediate;
pending->valid = TRUE;
/* flush invalidates the current stepping segment */
if (flush)
current->valid = FALSE;
GST_OBJECT_UNLOCK (sink);
}
static gboolean
gst_base_sink_perform_step (GstBaseSink * sink, GstPad * pad, GstEvent * event)
{
GstBaseSinkPrivate *priv;
GstBaseSinkClass *bclass;
gboolean flush, intermediate;
gdouble rate;
GstFormat format;
guint64 amount;
guint seqnum;
GstStepInfo *pending, *current;
GstMessage *message;
bclass = GST_BASE_SINK_GET_CLASS (sink);
priv = sink->priv;
GST_DEBUG_OBJECT (sink, "performing step with event %p", event);
gst_event_parse_step (event, &format, &amount, &rate, &flush, &intermediate);
seqnum = gst_event_get_seqnum (event);
pending = &priv->pending_step;
current = &priv->current_step;
/* post message first */
message = gst_message_new_step_start (GST_OBJECT (sink), FALSE, format,
amount, rate, flush, intermediate);
gst_message_set_seqnum (message, seqnum);
gst_element_post_message (GST_ELEMENT (sink), message);
if (flush) {
/* we need to call ::unlock before locking PREROLL_LOCK
* since we lock it before going into ::render */
if (bclass->unlock)
bclass->unlock (sink);
GST_BASE_SINK_PREROLL_LOCK (sink);
/* now that we have the PREROLL lock, clear our unlock request */
if (bclass->unlock_stop)
bclass->unlock_stop (sink);
/* update the stepinfo and make it valid */
set_step_info (sink, current, pending, seqnum, format, amount, rate, flush,
intermediate);
if (sink->priv->async_enabled) {
/* and we need to commit our state again on the next
* prerolled buffer */
sink->playing_async = TRUE;
priv->pending_step.need_preroll = TRUE;
sink->need_preroll = FALSE;
gst_element_lost_state (GST_ELEMENT_CAST (sink));
} else {
sink->priv->have_latency = TRUE;
sink->need_preroll = FALSE;
}
priv->current_sstart = GST_CLOCK_TIME_NONE;
priv->current_sstop = GST_CLOCK_TIME_NONE;
priv->eos_rtime = GST_CLOCK_TIME_NONE;
priv->call_preroll = TRUE;
gst_base_sink_set_last_buffer (sink, NULL);
gst_base_sink_reset_qos (sink);
if (sink->clock_id) {
gst_clock_id_unschedule (sink->clock_id);
}
if (sink->have_preroll) {
GST_DEBUG_OBJECT (sink, "signal waiter");
priv->step_unlock = TRUE;
GST_BASE_SINK_PREROLL_SIGNAL (sink);
}
GST_BASE_SINK_PREROLL_UNLOCK (sink);
} else {
/* update the stepinfo and make it valid */
set_step_info (sink, current, pending, seqnum, format, amount, rate, flush,
intermediate);
}
return TRUE;
}
/* with STREAM_LOCK
*/
static void
gst_base_sink_loop (GstPad * pad)
{
GstObject *parent;
GstBaseSink *basesink;
GstBuffer *buf = NULL;
GstFlowReturn result;
guint blocksize;
guint64 offset;
parent = GST_OBJECT_PARENT (pad);
basesink = GST_BASE_SINK (parent);
g_assert (basesink->pad_mode == GST_PAD_MODE_PULL);
if ((blocksize = basesink->priv->blocksize) == 0)
blocksize = -1;
offset = basesink->segment.position;
GST_DEBUG_OBJECT (basesink, "pulling %" G_GUINT64_FORMAT ", %u",
offset, blocksize);
result = gst_pad_pull_range (pad, offset, blocksize, &buf);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto paused;
if (G_UNLIKELY (buf == NULL))
goto no_buffer;
offset += gst_buffer_get_size (buf);
basesink->segment.position = offset;
GST_BASE_SINK_PREROLL_LOCK (basesink);
result = gst_base_sink_chain_unlocked (basesink, pad, buf, FALSE);
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto paused;
return;
/* ERRORS */
paused:
{
GST_LOG_OBJECT (basesink, "pausing task, reason %s",
gst_flow_get_name (result));
gst_pad_pause_task (pad);
if (result == GST_FLOW_EOS) {
/* perform EOS logic */
if (basesink->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_segment_done (GST_OBJECT_CAST (basesink),
basesink->segment.format, basesink->segment.position));
gst_base_sink_event (pad, parent,
gst_event_new_segment_done (basesink->segment.format,
basesink->segment.position));
} else {
gst_base_sink_event (pad, parent, gst_event_new_eos ());
}
} else if (result == GST_FLOW_NOT_LINKED || result <= GST_FLOW_EOS) {
/* for fatal errors we post an error message, post the error
* first so the app knows about the error first.
* wrong-state is not a fatal error because it happens due to
* flushing and posting an error message in that case is the
* wrong thing to do, e.g. when basesrc is doing a flushing
* seek. */
GST_ELEMENT_ERROR (basesink, STREAM, FAILED,
(_("Internal data stream error.")),
("stream stopped, reason %s", gst_flow_get_name (result)));
gst_base_sink_event (pad, parent, gst_event_new_eos ());
}
return;
}
no_buffer:
{
GST_LOG_OBJECT (basesink, "no buffer, pausing");
GST_ELEMENT_ERROR (basesink, STREAM, FAILED,
(_("Internal data flow error.")), ("element returned NULL buffer"));
result = GST_FLOW_ERROR;
goto paused;
}
}
static gboolean
gst_base_sink_set_flushing (GstBaseSink * basesink, GstPad * pad,
gboolean flushing)
{
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (flushing) {
/* unlock any subclasses, we need to do this before grabbing the
* PREROLL_LOCK since we hold this lock before going into ::render. */
if (bclass->unlock)
bclass->unlock (basesink);
}
GST_BASE_SINK_PREROLL_LOCK (basesink);
basesink->flushing = flushing;
if (flushing) {
/* step 1, now that we have the PREROLL lock, clear our unlock request */
if (bclass->unlock_stop)
bclass->unlock_stop (basesink);
/* set need_preroll before we unblock the clock. If the clock is unblocked
* before timing out, we can reuse the buffer for preroll. */
basesink->need_preroll = TRUE;
/* step 2, unblock clock sync (if any) or any other blocking thing */
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
/* flush out the data thread if it's locked in finish_preroll, this will
* also flush out the EOS state */
GST_DEBUG_OBJECT (basesink,
"flushing out data thread, need preroll to TRUE");
/* we can't have EOS anymore now */
basesink->eos = FALSE;
basesink->priv->received_eos = FALSE;
basesink->have_preroll = FALSE;
basesink->priv->step_unlock = FALSE;
/* can't report latency anymore until we preroll again */
if (basesink->priv->async_enabled) {
GST_OBJECT_LOCK (basesink);
basesink->priv->have_latency = FALSE;
GST_OBJECT_UNLOCK (basesink);
}
/* and signal any waiters now */
GST_BASE_SINK_PREROLL_SIGNAL (basesink);
}
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
return TRUE;
}
static gboolean
gst_base_sink_default_activate_pull (GstBaseSink * basesink, gboolean active)
{
gboolean result;
if (active) {
/* start task */
result = gst_pad_start_task (basesink->sinkpad,
(GstTaskFunction) gst_base_sink_loop, basesink->sinkpad, NULL);
} else {
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (basesink->sinkpad);
}
return result;
}
static gboolean
gst_base_sink_pad_activate (GstPad * pad, GstObject * parent)
{
gboolean result = FALSE;
GstBaseSink *basesink;
GstQuery *query;
gboolean pull_mode;
basesink = GST_BASE_SINK (parent);
GST_DEBUG_OBJECT (basesink, "Trying pull mode first");
gst_base_sink_set_flushing (basesink, pad, FALSE);
/* we need to have the pull mode enabled */
if (!basesink->can_activate_pull) {
GST_DEBUG_OBJECT (basesink, "pull mode disabled");
goto fallback;
}
/* check if downstreams supports pull mode at all */
query = gst_query_new_scheduling ();
if (!gst_pad_peer_query (pad, query)) {
gst_query_unref (query);
GST_DEBUG_OBJECT (basesink, "peer query faild, no pull mode");
goto fallback;
}
/* parse result of the query */
pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
gst_query_unref (query);
if (!pull_mode) {
GST_DEBUG_OBJECT (basesink, "pull mode not supported");
goto fallback;
}
/* set the pad mode before starting the task so that it's in the
* correct state for the new thread. also the sink set_caps and get_caps
* function checks this */
basesink->pad_mode = GST_PAD_MODE_PULL;
/* we first try to negotiate a format so that when we try to activate
* downstream, it knows about our format */
if (!gst_base_sink_negotiate_pull (basesink)) {
GST_DEBUG_OBJECT (basesink, "failed to negotiate in pull mode");
goto fallback;
}
/* ok activate now */
if (!gst_pad_activate_mode (pad, GST_PAD_MODE_PULL, TRUE)) {
/* clear any pending caps */
GST_OBJECT_LOCK (basesink);
gst_caps_replace (&basesink->priv->caps, NULL);
GST_OBJECT_UNLOCK (basesink);
GST_DEBUG_OBJECT (basesink, "failed to activate in pull mode");
goto fallback;
}
GST_DEBUG_OBJECT (basesink, "Success activating pull mode");
result = TRUE;
goto done;
/* push mode fallback */
fallback:
GST_DEBUG_OBJECT (basesink, "Falling back to push mode");
if ((result = gst_pad_activate_mode (pad, GST_PAD_MODE_PUSH, TRUE))) {
GST_DEBUG_OBJECT (basesink, "Success activating push mode");
}
done:
if (!result) {
GST_WARNING_OBJECT (basesink, "Could not activate pad in either mode");
gst_base_sink_set_flushing (basesink, pad, TRUE);
}
return result;
}
static gboolean
gst_base_sink_pad_activate_push (GstPad * pad, GstObject * parent,
gboolean active)
{
gboolean result;
GstBaseSink *basesink;
basesink = GST_BASE_SINK (parent);
if (active) {
if (!basesink->can_activate_push) {
result = FALSE;
basesink->pad_mode = GST_PAD_MODE_NONE;
} else {
result = TRUE;
basesink->pad_mode = GST_PAD_MODE_PUSH;
}
} else {
if (G_UNLIKELY (basesink->pad_mode != GST_PAD_MODE_PUSH)) {
g_warning ("Internal GStreamer activation error!!!");
result = FALSE;
} else {
gst_base_sink_set_flushing (basesink, pad, TRUE);
result = TRUE;
basesink->pad_mode = GST_PAD_MODE_NONE;
}
}
return result;
}
static gboolean
gst_base_sink_negotiate_pull (GstBaseSink * basesink)
{
GstCaps *caps;
gboolean result;
result = FALSE;
/* this returns the intersection between our caps and the peer caps. If there
* is no peer, it returns NULL and we can't operate in pull mode so we can
* fail the negotiation. */
caps = gst_pad_get_allowed_caps (GST_BASE_SINK_PAD (basesink));
if (caps == NULL || gst_caps_is_empty (caps))
goto no_caps_possible;
GST_DEBUG_OBJECT (basesink, "allowed caps: %" GST_PTR_FORMAT, caps);
if (gst_caps_is_any (caps)) {
GST_DEBUG_OBJECT (basesink, "caps were ANY after fixating, "
"allowing pull()");
/* neither side has template caps in this case, so they are prepared for
pull() without setcaps() */
result = TRUE;
} else {
/* try to fixate */
caps = gst_base_sink_fixate (basesink, caps);
GST_DEBUG_OBJECT (basesink, "fixated to: %" GST_PTR_FORMAT, caps);
if (gst_caps_is_fixed (caps)) {
if (!gst_pad_set_caps (GST_BASE_SINK_PAD (basesink), caps))
goto could_not_set_caps;
result = TRUE;
}
}
gst_caps_unref (caps);
return result;
no_caps_possible:
{
GST_INFO_OBJECT (basesink, "Pipeline could not agree on caps");
GST_DEBUG_OBJECT (basesink, "get_allowed_caps() returned EMPTY");
if (caps)
gst_caps_unref (caps);
return FALSE;
}
could_not_set_caps:
{
GST_INFO_OBJECT (basesink, "Could not set caps: %" GST_PTR_FORMAT, caps);
gst_caps_unref (caps);
return FALSE;
}
}
/* this won't get called until we implement an activate function */
static gboolean
gst_base_sink_pad_activate_pull (GstPad * pad, GstObject * parent,
gboolean active)
{
gboolean result = FALSE;
GstBaseSink *basesink;
GstBaseSinkClass *bclass;
basesink = GST_BASE_SINK (parent);
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (active) {
gint64 duration;
/* we mark we have a newsegment here because pull based
* mode works just fine without having a newsegment before the
* first buffer */
gst_segment_init (&basesink->segment, GST_FORMAT_BYTES);
GST_OBJECT_LOCK (basesink);
basesink->have_newsegment = TRUE;
GST_OBJECT_UNLOCK (basesink);
/* get the peer duration in bytes */
result = gst_pad_peer_query_duration (pad, GST_FORMAT_BYTES, &duration);
if (result) {
GST_DEBUG_OBJECT (basesink,
"setting duration in bytes to %" G_GINT64_FORMAT, duration);
basesink->segment.duration = duration;
} else {
GST_DEBUG_OBJECT (basesink, "unknown duration");
}
if (bclass->activate_pull)
result = bclass->activate_pull (basesink, TRUE);
else
result = FALSE;
if (!result)
goto activate_failed;
} else {
if (G_UNLIKELY (basesink->pad_mode != GST_PAD_MODE_PULL)) {
g_warning ("Internal GStreamer activation error!!!");
result = FALSE;
} else {
result = gst_base_sink_set_flushing (basesink, pad, TRUE);
if (bclass->activate_pull)
result &= bclass->activate_pull (basesink, FALSE);
basesink->pad_mode = GST_PAD_MODE_NONE;
}
}
return result;
/* ERRORS */
activate_failed:
{
/* reset, as starting the thread failed */
basesink->pad_mode = GST_PAD_MODE_NONE;
GST_ERROR_OBJECT (basesink, "subclass failed to activate in pull mode");
return FALSE;
}
}
static gboolean
gst_base_sink_pad_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean res;
switch (mode) {
case GST_PAD_MODE_PULL:
res = gst_base_sink_pad_activate_pull (pad, parent, active);
break;
case GST_PAD_MODE_PUSH:
res = gst_base_sink_pad_activate_push (pad, parent, active);
break;
default:
GST_LOG_OBJECT (pad, "unknown activation mode %d", mode);
res = FALSE;
break;
}
return res;
}
/* send an event to our sinkpad peer. */
static gboolean
gst_base_sink_send_event (GstElement * element, GstEvent * event)
{
GstPad *pad;
GstBaseSink *basesink = GST_BASE_SINK (element);
gboolean forward, result = TRUE;
GstPadMode mode;
GST_OBJECT_LOCK (element);
/* get the pad and the scheduling mode */
pad = gst_object_ref (basesink->sinkpad);
mode = basesink->pad_mode;
GST_OBJECT_UNLOCK (element);
/* only push UPSTREAM events upstream */
forward = GST_EVENT_IS_UPSTREAM (event);
GST_DEBUG_OBJECT (basesink, "handling event %p %" GST_PTR_FORMAT, event,
event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_LATENCY:
{
GstClockTime latency;
gst_event_parse_latency (event, &latency);
/* store the latency. We use this to adjust the running_time before syncing
* it to the clock. */
GST_OBJECT_LOCK (element);
basesink->priv->latency = latency;
if (!basesink->priv->have_latency)
forward = FALSE;
GST_OBJECT_UNLOCK (element);
GST_DEBUG_OBJECT (basesink, "latency set to %" GST_TIME_FORMAT,
GST_TIME_ARGS (latency));
/* We forward this event so that all elements know about the global pipeline
* latency. This is interesting for an element when it wants to figure out
* when a particular piece of data will be rendered. */
break;
}
case GST_EVENT_SEEK:
/* in pull mode we will execute the seek */
if (mode == GST_PAD_MODE_PULL)
result = gst_base_sink_perform_seek (basesink, pad, event);
break;
case GST_EVENT_STEP:
result = gst_base_sink_perform_step (basesink, pad, event);
forward = FALSE;
break;
default:
break;
}
if (forward) {
result = gst_pad_push_event (pad, event);
} else {
/* not forwarded, unref the event */
gst_event_unref (event);
}
gst_object_unref (pad);
GST_DEBUG_OBJECT (basesink, "handled event %p %" GST_PTR_FORMAT ": %d", event,
event, result);
return result;
}
static gboolean
gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
gint64 * cur, gboolean * upstream)
{
GstClock *clock = NULL;
gboolean res = FALSE;
GstFormat oformat;
GstSegment *segment;
GstClockTime now, latency;
GstClockTimeDiff base_time;
gint64 time, base, duration;
gdouble rate;
gint64 last;
gboolean last_seen, with_clock, in_paused;
GST_OBJECT_LOCK (basesink);
/* we can only get the segment when we are not NULL or READY */
if (!basesink->have_newsegment)
goto wrong_state;
in_paused = FALSE;
/* when not in PLAYING or when we're busy with a state change, we
* cannot read from the clock so we report time based on the
* last seen timestamp. */
if (GST_STATE (basesink) != GST_STATE_PLAYING ||
GST_STATE_PENDING (basesink) != GST_STATE_VOID_PENDING) {
in_paused = TRUE;
}
segment = &basesink->segment;
/* get the format in the segment */
oformat = segment->format;
/* report with last seen position when EOS */
last_seen = basesink->eos;
/* assume we will use the clock for getting the current position */
with_clock = TRUE;
if (basesink->sync == FALSE)
with_clock = FALSE;
/* and we need a clock */
if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (basesink)) == NULL))
with_clock = FALSE;
else
gst_object_ref (clock);
/* mainloop might be querying position when going to playing async,
* while (audio) rendering might be quickly advancing stream position,
* so use clock asap rather than last reported position */
if (in_paused && with_clock && g_atomic_int_get (&basesink->priv->to_playing)) {
GST_DEBUG_OBJECT (basesink, "going to PLAYING, so not PAUSED");
in_paused = FALSE;
}
/* collect all data we need holding the lock */
if (GST_CLOCK_TIME_IS_VALID (segment->time))
time = segment->time;
else
time = 0;
if (GST_CLOCK_TIME_IS_VALID (segment->stop))
duration = segment->stop - segment->start;
else
duration = 0;
base = segment->base;
rate = segment->rate * segment->applied_rate;
latency = basesink->priv->latency;
if (in_paused) {
/* in paused, use start_time */
base_time = GST_ELEMENT_START_TIME (basesink);
GST_DEBUG_OBJECT (basesink, "in paused, using start time %" GST_TIME_FORMAT,
GST_TIME_ARGS (base_time));
} else if (with_clock) {
/* else use clock when needed */
base_time = GST_ELEMENT_CAST (basesink)->base_time;
GST_DEBUG_OBJECT (basesink, "using clock and base time %" GST_TIME_FORMAT,
GST_TIME_ARGS (base_time));
} else {
/* else, no sync or clock -> no base time */
GST_DEBUG_OBJECT (basesink, "no sync or no clock");
base_time = -1;
}
/* no base_time, we can't calculate running_time, use last seem timestamp to report
* time */
if (base_time == -1)
last_seen = TRUE;
if (oformat == GST_FORMAT_TIME) {
gint64 start, stop;
start = basesink->priv->current_sstart;
stop = basesink->priv->current_sstop;
if (in_paused || last_seen) {
/* in paused or when we don't use the clock, we use the last position
* as a lower bound */
if (stop == -1 || segment->rate > 0.0)
last = start;
else
last = stop;
GST_DEBUG_OBJECT (basesink, "in PAUSED using last %" GST_TIME_FORMAT,
GST_TIME_ARGS (last));
} else {
/* in playing, use last stop time as upper bound */
if (start == -1 || segment->rate > 0.0)
last = stop;
else
last = start;
GST_DEBUG_OBJECT (basesink, "in PLAYING using last %" GST_TIME_FORMAT,
GST_TIME_ARGS (last));
}
} else {
/* convert position to stream time */
last = gst_segment_to_stream_time (segment, oformat, segment->position);
GST_DEBUG_OBJECT (basesink, "in using last %" G_GINT64_FORMAT, last);
}
/* need to release the object lock before we can get the time,
* a clock might take the LOCK of the provider, which could be
* a basesink subclass. */
GST_OBJECT_UNLOCK (basesink);
if (last_seen) {
/* in EOS or when no valid stream_time, report the value of last seen
* timestamp */
if (last == -1) {
/* no timestamp, we need to ask upstream */
GST_DEBUG_OBJECT (basesink, "no last seen timestamp, asking upstream");
res = FALSE;
*upstream = TRUE;
goto done;
}
GST_DEBUG_OBJECT (basesink, "using last seen timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (last));
*cur = last;
} else {
if (oformat != GST_FORMAT_TIME) {
/* convert base, time and duration to time */
if (!gst_pad_query_convert (basesink->sinkpad, oformat, base,
GST_FORMAT_TIME, &base))
goto convert_failed;
if (!gst_pad_query_convert (basesink->sinkpad, oformat, duration,
GST_FORMAT_TIME, &duration))
goto convert_failed;
if (!gst_pad_query_convert (basesink->sinkpad, oformat, time,
GST_FORMAT_TIME, &time))
goto convert_failed;
if (!gst_pad_query_convert (basesink->sinkpad, oformat, last,
GST_FORMAT_TIME, &last))
goto convert_failed;
/* assume time format from now on */
oformat = GST_FORMAT_TIME;
}
if (!in_paused && with_clock) {
now = gst_clock_get_time (clock);
} else {
now = base_time;
base_time = 0;
}
/* subtract base time and base time from the clock time.
* Make sure we don't go negative. This is the current time in
* the segment which we need to scale with the combined
* rate and applied rate. */
base_time += base;
base_time += latency;
if (GST_CLOCK_DIFF (base_time, now) < 0)
base_time = now;
/* for negative rates we need to count back from the segment
* duration. */
if (rate < 0.0)
time += duration;
*cur = time + gst_guint64_to_gdouble (now - base_time) * rate;
if (in_paused) {
/* never report less than segment values in paused */
if (last != -1)
*cur = MAX (last, *cur);
} else {
/* never report more than last seen position in playing */
if (last != -1)
*cur = MIN (last, *cur);
}
GST_DEBUG_OBJECT (basesink,
"now %" GST_TIME_FORMAT " - base_time %" GST_TIME_FORMAT " - base %"
GST_TIME_FORMAT " + time %" GST_TIME_FORMAT " last %" GST_TIME_FORMAT,
GST_TIME_ARGS (now), GST_TIME_ARGS (base_time), GST_TIME_ARGS (base),
GST_TIME_ARGS (time), GST_TIME_ARGS (last));
}
if (oformat != format) {
/* convert to final format */
if (!gst_pad_query_convert (basesink->sinkpad, oformat, *cur, format, cur))
goto convert_failed;
}
res = TRUE;
done:
GST_DEBUG_OBJECT (basesink, "res: %d, POSITION: %" GST_TIME_FORMAT,
res, GST_TIME_ARGS (*cur));
if (clock)
gst_object_unref (clock);
return res;
/* special cases */
wrong_state:
{
/* in NULL or READY we always return FALSE and -1 */
GST_DEBUG_OBJECT (basesink, "position in wrong state, return -1");
res = FALSE;
*cur = -1;
GST_OBJECT_UNLOCK (basesink);
goto done;
}
convert_failed:
{
GST_DEBUG_OBJECT (basesink, "convert failed, try upstream");
*upstream = TRUE;
res = FALSE;
goto done;
}
}
static gboolean
gst_base_sink_get_duration (GstBaseSink * basesink, GstFormat format,
gint64 * dur, gboolean * upstream)
{
gboolean res = FALSE;
if (basesink->pad_mode == GST_PAD_MODE_PULL) {
gint64 uduration;
/* get the duration in bytes, in pull mode that's all we are sure to
* know. We have to explicitly get this value from upstream instead of
* using our cached value because it might change. Duration caching
* should be done at a higher level. */
res =
gst_pad_peer_query_duration (basesink->sinkpad, GST_FORMAT_BYTES,
&uduration);
if (res) {
basesink->segment.duration = uduration;
if (format != GST_FORMAT_BYTES) {
/* convert to the requested format */
res =
gst_pad_query_convert (basesink->sinkpad, GST_FORMAT_BYTES,
uduration, format, dur);
} else {
*dur = uduration;
}
}
*upstream = FALSE;
} else {
*upstream = TRUE;
}
return res;
}
static gboolean
default_element_query (GstElement * element, GstQuery * query)
{
gboolean res = FALSE;
GstBaseSink *basesink = GST_BASE_SINK (element);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 cur = 0;
GstFormat format;
gboolean upstream = FALSE;
gst_query_parse_position (query, &format, NULL);
GST_DEBUG_OBJECT (basesink, "position query in format %s",
gst_format_get_name (format));
/* first try to get the position based on the clock */
if ((res =
gst_base_sink_get_position (basesink, format, &cur, &upstream))) {
gst_query_set_position (query, format, cur);
} else if (upstream) {
/* fallback to peer query */
res = gst_pad_peer_query (basesink->sinkpad, query);
}
if (!res) {
/* we can handle a few things if upstream failed */
if (format == GST_FORMAT_PERCENT) {
gint64 dur = 0;
res = gst_base_sink_get_position (basesink, GST_FORMAT_TIME, &cur,
&upstream);
if (!res && upstream) {
res =
gst_pad_peer_query_position (basesink->sinkpad, GST_FORMAT_TIME,
&cur);
}
if (res) {
res = gst_base_sink_get_duration (basesink, GST_FORMAT_TIME, &dur,
&upstream);
if (!res && upstream) {
res =
gst_pad_peer_query_duration (basesink->sinkpad,
GST_FORMAT_TIME, &dur);
}
}
if (res) {
gint64 pos;
pos = gst_util_uint64_scale (100 * GST_FORMAT_PERCENT_SCALE, cur,
dur);
gst_query_set_position (query, GST_FORMAT_PERCENT, pos);
}
}
}
break;
}
case GST_QUERY_DURATION:
{
gint64 dur = 0;
GstFormat format;
gboolean upstream = FALSE;
gst_query_parse_duration (query, &format, NULL);
GST_DEBUG_OBJECT (basesink, "duration query in format %s",
gst_format_get_name (format));
if ((res =
gst_base_sink_get_duration (basesink, format, &dur, &upstream))) {
gst_query_set_duration (query, format, dur);
} else if (upstream) {
/* fallback to peer query */
res = gst_pad_peer_query (basesink->sinkpad, query);
}
if (!res) {
/* we can handle a few things if upstream failed */
if (format == GST_FORMAT_PERCENT) {
gst_query_set_duration (query, GST_FORMAT_PERCENT,
GST_FORMAT_PERCENT_MAX);
res = TRUE;
}
}
break;
}
case GST_QUERY_LATENCY:
{
gboolean live, us_live;
GstClockTime min, max;
if ((res = gst_base_sink_query_latency (basesink, &live, &us_live, &min,
&max))) {
gst_query_set_latency (query, live, min, max);
}
break;
}
case GST_QUERY_JITTER:
break;
case GST_QUERY_RATE:
/* gst_query_set_rate (query, basesink->segment_rate); */
res = TRUE;
break;
case GST_QUERY_SEGMENT:
{
if (basesink->pad_mode == GST_PAD_MODE_PULL) {
gst_query_set_segment (query, basesink->segment.rate,
GST_FORMAT_TIME, basesink->segment.start, basesink->segment.stop);
res = TRUE;
} else {
res = gst_pad_peer_query (basesink->sinkpad, query);
}
break;
}
case GST_QUERY_SEEKING:
case GST_QUERY_CONVERT:
case GST_QUERY_FORMATS:
default:
res = gst_pad_peer_query (basesink->sinkpad, query);
break;
}
GST_DEBUG_OBJECT (basesink, "query %s returns %d",
GST_QUERY_TYPE_NAME (query), res);
return res;
}
static gboolean
gst_base_sink_default_query (GstBaseSink * basesink, GstQuery * query)
{
gboolean res;
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
{
if (bclass->propose_allocation)
res = bclass->propose_allocation (basesink, query);
else
res = FALSE;
break;
}
case GST_QUERY_CAPS:
{
GstCaps *caps, *filter;
gst_query_parse_caps (query, &filter);
caps = gst_base_sink_query_caps (basesink, basesink->sinkpad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
case GST_QUERY_ACCEPT_CAPS:
{
GstCaps *caps, *allowed;
gboolean subset;
/* slightly faster than the default implementation */
gst_query_parse_accept_caps (query, &caps);
allowed = gst_base_sink_query_caps (basesink, basesink->sinkpad, NULL);
subset = gst_caps_is_subset (caps, allowed);
gst_caps_unref (allowed);
gst_query_set_accept_caps_result (query, subset);
res = TRUE;
break;
}
case GST_QUERY_DRAIN:
res = TRUE;
break;
default:
res =
gst_pad_query_default (basesink->sinkpad, GST_OBJECT_CAST (basesink),
query);
break;
}
return res;
}
static gboolean
gst_base_sink_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstBaseSink *basesink;
GstBaseSinkClass *bclass;
gboolean res;
basesink = GST_BASE_SINK_CAST (parent);
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (bclass->query)
res = bclass->query (basesink, query);
else
res = FALSE;
return res;
}
static GstStateChangeReturn
gst_base_sink_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstBaseSink *basesink = GST_BASE_SINK (element);
GstBaseSinkClass *bclass;
GstBaseSinkPrivate *priv;
priv = basesink->priv;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (bclass->start)
if (!bclass->start (basesink))
goto start_failed;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* need to complete preroll before this state change completes, there
* is no data flow in READY so we can safely assume we need to preroll. */
GST_BASE_SINK_PREROLL_LOCK (basesink);
GST_DEBUG_OBJECT (basesink, "READY to PAUSED");
basesink->have_newsegment = FALSE;
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
basesink->offset = 0;
basesink->have_preroll = FALSE;
priv->step_unlock = FALSE;
basesink->need_preroll = TRUE;
basesink->playing_async = TRUE;
priv->current_sstart = GST_CLOCK_TIME_NONE;
priv->current_sstop = GST_CLOCK_TIME_NONE;
priv->eos_rtime = GST_CLOCK_TIME_NONE;
priv->latency = 0;
basesink->eos = FALSE;
priv->received_eos = FALSE;
gst_base_sink_reset_qos (basesink);
priv->rc_next = -1;
priv->commited = FALSE;
priv->call_preroll = TRUE;
priv->current_step.valid = FALSE;
priv->pending_step.valid = FALSE;
if (priv->async_enabled) {
GST_DEBUG_OBJECT (basesink, "doing async state change");
/* when async enabled, post async-start message and return ASYNC from
* the state change function */
ret = GST_STATE_CHANGE_ASYNC;
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_async_start (GST_OBJECT_CAST (basesink)));
} else {
priv->have_latency = TRUE;
}
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_BASE_SINK_PREROLL_LOCK (basesink);
g_atomic_int_set (&basesink->priv->to_playing, TRUE);
if (!gst_base_sink_needs_preroll (basesink)) {
GST_DEBUG_OBJECT (basesink, "PAUSED to PLAYING, don't need preroll");
/* no preroll needed anymore now. */
basesink->playing_async = FALSE;
basesink->need_preroll = FALSE;
if (basesink->eos) {
GstMessage *message;
/* need to post EOS message here */
GST_DEBUG_OBJECT (basesink, "Now posting EOS");
message = gst_message_new_eos (GST_OBJECT_CAST (basesink));
gst_message_set_seqnum (message, basesink->priv->seqnum);
gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
} else {
GST_DEBUG_OBJECT (basesink, "signal preroll");
GST_BASE_SINK_PREROLL_SIGNAL (basesink);
}
} else {
GST_DEBUG_OBJECT (basesink, "PAUSED to PLAYING, we are not prerolled");
basesink->need_preroll = TRUE;
basesink->playing_async = TRUE;
priv->call_preroll = TRUE;
priv->commited = FALSE;
if (priv->async_enabled) {
GST_DEBUG_OBJECT (basesink, "doing async state change");
ret = GST_STATE_CHANGE_ASYNC;
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_async_start (GST_OBJECT_CAST (basesink)));
}
}
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
break;
default:
break;
}
{
GstStateChangeReturn bret;
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE))
goto activate_failed;
}
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
/* completed transition, so need not be marked any longer
* And it should be unmarked, since e.g. losing our position upon flush
* does not really change state to PAUSED ... */
g_atomic_int_set (&basesink->priv->to_playing, FALSE);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
g_atomic_int_set (&basesink->priv->to_playing, FALSE);
GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED");
/* FIXME, make sure we cannot enter _render first */
/* we need to call ::unlock before locking PREROLL_LOCK
* since we lock it before going into ::render */
if (bclass->unlock)
bclass->unlock (basesink);
GST_BASE_SINK_PREROLL_LOCK (basesink);
GST_DEBUG_OBJECT (basesink, "got preroll lock");
/* now that we have the PREROLL lock, clear our unlock request */
if (bclass->unlock_stop)
bclass->unlock_stop (basesink);
/* we need preroll again and we set the flag before unlocking the clockid
* because if the clockid is unlocked before a current buffer expired, we
* can use that buffer to preroll with */
basesink->need_preroll = TRUE;
if (basesink->clock_id) {
GST_DEBUG_OBJECT (basesink, "unschedule clock");
gst_clock_id_unschedule (basesink->clock_id);
}
/* if we don't have a preroll buffer we need to wait for a preroll and
* return ASYNC. */
if (!gst_base_sink_needs_preroll (basesink)) {
GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED, we are prerolled");
basesink->playing_async = FALSE;
} else {
if (GST_STATE_TARGET (GST_ELEMENT (basesink)) <= GST_STATE_READY) {
GST_DEBUG_OBJECT (basesink, "element is <= READY");
ret = GST_STATE_CHANGE_SUCCESS;
} else {
GST_DEBUG_OBJECT (basesink,
"PLAYING to PAUSED, we are not prerolled");
basesink->playing_async = TRUE;
priv->commited = FALSE;
priv->call_preroll = TRUE;
if (priv->async_enabled) {
GST_DEBUG_OBJECT (basesink, "doing async state change");
ret = GST_STATE_CHANGE_ASYNC;
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_async_start (GST_OBJECT_CAST (basesink)));
}
}
}
GST_DEBUG_OBJECT (basesink, "rendered: %" G_GUINT64_FORMAT
", dropped: %" G_GUINT64_FORMAT, priv->rendered, priv->dropped);
gst_base_sink_reset_qos (basesink);
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_BASE_SINK_PREROLL_LOCK (basesink);
/* start by resetting our position state with the object lock so that the
* position query gets the right idea. We do this before we post the
* messages so that the message handlers pick this up. */
GST_OBJECT_LOCK (basesink);
basesink->have_newsegment = FALSE;
priv->current_sstart = GST_CLOCK_TIME_NONE;
priv->current_sstop = GST_CLOCK_TIME_NONE;
priv->have_latency = FALSE;
if (priv->cached_clock_id) {
gst_clock_id_unref (priv->cached_clock_id);
priv->cached_clock_id = NULL;
}
gst_caps_replace (&basesink->priv->caps, NULL);
GST_OBJECT_UNLOCK (basesink);
gst_base_sink_set_last_buffer (basesink, NULL);
priv->call_preroll = FALSE;
if (!priv->commited) {
if (priv->async_enabled) {
GST_DEBUG_OBJECT (basesink, "PAUSED to READY, posting async-done");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
GST_STATE_PLAYING, GST_STATE_PAUSED, GST_STATE_READY));
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_async_done (GST_OBJECT_CAST (basesink),
GST_CLOCK_TIME_NONE));
}
priv->commited = TRUE;
} else {
GST_DEBUG_OBJECT (basesink, "PAUSED to READY, don't need_preroll");
}
GST_BASE_SINK_PREROLL_UNLOCK (basesink);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (bclass->stop) {
if (!bclass->stop (basesink)) {
GST_WARNING_OBJECT (basesink, "failed to stop");
}
}
gst_base_sink_set_last_buffer (basesink, NULL);
priv->call_preroll = FALSE;
break;
default:
break;
}
return ret;
/* ERRORS */
start_failed:
{
GST_DEBUG_OBJECT (basesink, "failed to start");
return GST_STATE_CHANGE_FAILURE;
}
activate_failed:
{
GST_DEBUG_OBJECT (basesink,
"element failed to change states -- activation problem?");
return GST_STATE_CHANGE_FAILURE;
}
}
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