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gstreamer/libs/gst/base/gstbasesink.c
Wim Taymans c1b135b4a3 Docs fixes. 
Original commit message from CVS:
* gst/gstbuffer.c:
* gst/gstquery.c: (gst_query_list_add_format),
(gst_query_set_formatsv), (gst_query_parse_formats_length),
(gst_query_parse_formats_nth):
* libs/gst/base/gstbasesink.c: (gst_base_sink_get_sync_times):
Docs fixes.
2006-02-14 13:07:10 +00:00

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/* GStreamer
* Copyright (C) 2005,2006 Wim Taymans <wim@fluendo.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstbasesink
* @short_description: Base class for sink elements
* @see_also: #GstBaseTransform, #GstBaseSource
*
* #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 is sufficient.
*
* There is only support in GstBaseSink for one sink pad, which should be named
* "sink". A sink implementation (subclass of GstBaseSink) should install a pad
* template in its base_init function, like so:
* <programlisting>
* static void
* my_element_base_init (gpointer g_class)
* {
* GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
*
* // 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));
* // see #GstElementDetails
* gst_element_class_set_details (gstelement_class, &amp;details);
* }
* </programlisting>
*
* #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 GstBaseSink::preroll
* vmethod with this preroll buffer and will then commit the state change to
* PAUSED.
*
* When the element is set to PLAYING, #GstBaseSink will synchronize on the clock
* using the times returned from ::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 "sync" property
* to FALSE.
*
* After synchronisation the virtual method #GstBaseSink::render will be called.
* Subclasses should minimally implement this method.
*
* Since 0.10.3 subclasses that synchronize on the clock in the ::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 would be an audiosink.
*
* 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 ::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_NEW_SEGMENT events to schedule
* synchronisation and clipping of buffers. Buffers that fall completely outside
* of the 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 the element is EOS, PAUSED or no clock has been set on the element, the
* query will be forwarded upstream.
*
* The ::set_caps function will be called when the subclass should configure itself
* to precess a specific media type.
*
* The ::start and ::stop virtual methods will be called when resources should be
* allocated. Any ::preroll, ::render and ::set_caps function will be called
* between the ::start and ::stop calls.
*
* The ::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 that need to handle the newsegment event specially.
*
* #GstBaseSink provides an overridable ::buffer_alloc function that can be used
* by specific sinks that want to do reverse negotiation or want to provided
* hardware accelerated buffers for downstream elements.
*
* The ::unlock method is called when the elements should unblock any blocking
* operations they perform in the ::render method. This is mostly usefull when
* the ::render method performs a blocking write on a file descripter.
*
* Last reviewed on 2006-01-30 (0.10.3)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstbasesink.h"
#include <gst/gstmarshal.h>
#include <gst/gst-i18n-lib.h>
GST_DEBUG_CATEGORY_STATIC (gst_base_sink_debug);
#define GST_CAT_DEFAULT gst_base_sink_debug
/* BaseSink signals and properties */
enum
{
/* FILL ME */
SIGNAL_HANDOFF,
LAST_SIGNAL
};
#define DEFAULT_SIZE 1024
#define DEFAULT_CAN_ACTIVATE_PULL FALSE /* fixme: enable me */
#define DEFAULT_CAN_ACTIVATE_PUSH TRUE
#define DEFAULT_SYNC TRUE
enum
{
PROP_0,
PROP_PREROLL_QUEUE_LEN,
PROP_SYNC
};
static GstElementClass *parent_class = NULL;
static void gst_base_sink_base_init (gpointer g_class);
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 GType base_sink_type = 0;
if (!base_sink_type) {
static const GTypeInfo base_sink_info = {
sizeof (GstBaseSinkClass),
(GBaseInitFunc) gst_base_sink_base_init,
NULL,
(GClassInitFunc) gst_base_sink_class_init,
NULL,
NULL,
sizeof (GstBaseSink),
0,
(GInstanceInitFunc) gst_base_sink_init,
};
base_sink_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseSink", &base_sink_info, G_TYPE_FLAG_ABSTRACT);
}
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 gst_base_sink_query (GstElement * element, GstQuery * query);
static GstCaps *gst_base_sink_get_caps (GstBaseSink * sink);
static gboolean gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps);
static GstFlowReturn gst_base_sink_buffer_alloc (GstBaseSink * sink,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
static void gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end);
static gboolean gst_base_sink_set_flushing (GstBaseSink * basesink,
GstPad * pad, gboolean flushing);
static GstStateChangeReturn gst_base_sink_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_base_sink_chain (GstPad * pad, GstBuffer * buffer);
static void gst_base_sink_loop (GstPad * pad);
static gboolean gst_base_sink_activate (GstPad * pad);
static gboolean gst_base_sink_activate_push (GstPad * pad, gboolean active);
static gboolean gst_base_sink_activate_pull (GstPad * pad, gboolean active);
static gboolean gst_base_sink_event (GstPad * pad, GstEvent * event);
static void
gst_base_sink_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (gst_base_sink_debug, "basesink", 0,
"basesink element");
}
static void
gst_base_sink_class_init (GstBaseSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_sink_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_sink_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_sink_get_property);
/* FIXME, this next value should be configured using an event from the
* upstream element, ie, the BUFFER_SIZE event. */
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_PREROLL_QUEUE_LEN,
g_param_spec_uint ("preroll-queue-len", "preroll-queue-len",
"Number of buffers to queue during preroll", 0, G_MAXUINT, 0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SYNC,
g_param_spec_boolean ("sync", "Sync", "Sync on the clock", DEFAULT_SYNC,
G_PARAM_READWRITE));
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 (gst_base_sink_query);
klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_sink_get_caps);
klass->set_caps = GST_DEBUG_FUNCPTR (gst_base_sink_set_caps);
klass->buffer_alloc = GST_DEBUG_FUNCPTR (gst_base_sink_buffer_alloc);
klass->get_times = GST_DEBUG_FUNCPTR (gst_base_sink_get_times);
}
static GstCaps *
gst_base_sink_pad_getcaps (GstPad * pad)
{
GstBaseSinkClass *bclass;
GstBaseSink *bsink;
GstCaps *caps = NULL;
bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
bclass = GST_BASE_SINK_GET_CLASS (bsink);
if (bclass->get_caps)
caps = bclass->get_caps (bsink);
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_caps_ref (gst_pad_template_get_caps (pad_template));
}
}
gst_object_unref (bsink);
return caps;
}
static gboolean
gst_base_sink_pad_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseSinkClass *bclass;
GstBaseSink *bsink;
gboolean res = FALSE;
bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
bclass = GST_BASE_SINK_GET_CLASS (bsink);
if (bclass->set_caps)
res = bclass->set_caps (bsink, caps);
gst_object_unref (bsink);
return res;
}
static GstFlowReturn
gst_base_sink_pad_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstBaseSinkClass *bclass;
GstBaseSink *bsink;
GstFlowReturn result = GST_FLOW_OK;
bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
bclass = GST_BASE_SINK_GET_CLASS (bsink);
if (bclass->buffer_alloc)
result = bclass->buffer_alloc (bsink, offset, size, caps, buf);
else
*buf = NULL; /* fallback in gstpad.c will allocate generic buffer */
gst_object_unref (bsink);
return result;
}
static void
gst_base_sink_init (GstBaseSink * basesink, gpointer g_class)
{
GstPadTemplate *pad_template;
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_getcaps_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_pad_getcaps));
gst_pad_set_setcaps_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_pad_setcaps));
gst_pad_set_bufferalloc_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_pad_buffer_alloc));
gst_pad_set_activate_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_activate));
gst_pad_set_activatepush_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_activate_push));
gst_pad_set_activatepull_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_activate_pull));
gst_pad_set_event_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_event));
gst_pad_set_chain_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_sink_chain));
gst_element_add_pad (GST_ELEMENT_CAST (basesink), basesink->sinkpad);
basesink->pad_mode = GST_ACTIVATE_NONE;
basesink->preroll_queue = g_queue_new ();
basesink->abidata.ABI.clip_segment = gst_segment_new ();
basesink->can_activate_push = DEFAULT_CAN_ACTIVATE_PUSH;
basesink->can_activate_pull = DEFAULT_CAN_ACTIVATE_PULL;
basesink->sync = DEFAULT_SYNC;
GST_OBJECT_FLAG_SET (basesink, GST_ELEMENT_IS_SINK);
}
static void
gst_base_sink_finalize (GObject * object)
{
GstBaseSink *basesink;
basesink = GST_BASE_SINK (object);
g_queue_free (basesink->preroll_queue);
gst_segment_free (basesink->abidata.ABI.clip_segment);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
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_PREROLL_QUEUE_LEN:
/* preroll lock necessary to serialize with finish_preroll */
GST_PAD_PREROLL_LOCK (sink->sinkpad);
sink->preroll_queue_max_len = g_value_get_uint (value);
GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
break;
case PROP_SYNC:
GST_OBJECT_LOCK (sink);
sink->sync = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (sink);
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_PREROLL_QUEUE_LEN:
GST_PAD_PREROLL_LOCK (sink->sinkpad);
g_value_set_uint (value, sink->preroll_queue_max_len);
GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
break;
case PROP_SYNC:
GST_OBJECT_LOCK (sink);
g_value_set_boolean (value, sink->sync);
GST_OBJECT_UNLOCK (sink);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
gst_base_sink_get_caps (GstBaseSink * sink)
{
return NULL;
}
static gboolean
gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps)
{
return TRUE;
}
static GstFlowReturn
gst_base_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
*buf = NULL;
return GST_FLOW_OK;
}
/* with PREROLL_LOCK, STREAM_LOCK */
static void
gst_base_sink_preroll_queue_flush (GstBaseSink * basesink, GstPad * pad)
{
GstMiniObject *obj;
GST_DEBUG_OBJECT (basesink, "flushing queue %p", basesink);
while ((obj = g_queue_pop_head (basesink->preroll_queue))) {
GST_DEBUG_OBJECT (basesink, "popped %p", obj);
gst_mini_object_unref (obj);
}
/* we can't have EOS anymore now */
basesink->eos = FALSE;
basesink->eos_queued = FALSE;
basesink->preroll_queued = 0;
basesink->buffers_queued = 0;
basesink->events_queued = 0;
basesink->have_preroll = FALSE;
/* and signal any waiters now */
GST_PAD_PREROLL_SIGNAL (pad);
}
/* with STREAM_LOCK, configures given segment with the event information. */
static void
gst_base_sink_configure_segment (GstBaseSink * basesink, GstPad * pad,
GstEvent * event, GstSegment * segment)
{
gboolean update;
gdouble rate;
GstFormat format;
gint64 start;
gint64 stop;
gint64 time;
/* 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_parse_new_segment (event, &update, &rate, &format,
&start, &stop, &time);
GST_OBJECT_LOCK (basesink);
if (segment->format != format)
gst_segment_init (segment, format);
gst_segment_set_newsegment (segment, update, rate, format, start, stop, time);
GST_DEBUG_OBJECT (basesink,
"configured NEWSEGMENT %" GST_TIME_FORMAT " -- %"
GST_TIME_FORMAT ", time %" GST_TIME_FORMAT ", accum %"
GST_TIME_FORMAT,
GST_TIME_ARGS (segment->start),
GST_TIME_ARGS (segment->stop),
GST_TIME_ARGS (segment->time), GST_TIME_ARGS (segment->accum));
GST_OBJECT_UNLOCK (basesink);
}
/* 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;
GstMessage *message;
gboolean post_paused = FALSE;
gboolean post_playing = 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_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_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;
}
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) {
message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
current, next, post_pending);
gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
}
if (post_playing) {
message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
next, pending, GST_STATE_VOID_PENDING);
gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
}
/* and mark dirty */
if (post_paused || post_playing) {
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_state_dirty (GST_OBJECT_CAST (basesink)));
}
GST_STATE_BROADCAST (basesink);
return TRUE;
nothing_pending:
{
GST_DEBUG_OBJECT (basesink, "nothing to commit");
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;
}
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Returns TRUE if the object needs synchronisation and takes therefore
* part in prerolling.
*
* start and stop cannot be NULL.
*/
static gboolean
gst_base_sink_get_sync_times (GstBaseSink * basesink, GstMiniObject * obj,
GstClockTime * start, GstClockTime * stop)
{
GstClockTime sstart, sstop;
gint64 cstart, cstop;
GstBaseSinkClass *bclass;
GstBuffer *buffer;
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:
*start = basesink->end_time;
*stop = -1;
return TRUE;
/* other events do not need syncing */
/* FIXME, maybe NEWSEGMENT might need synchronisation
* since the POSITION query depends on accumulated times and
* we cannot accumulate the current segment before the previous
* one completed.
*/
default:
return FALSE;
}
}
/* else do buffer sync code */
buffer = GST_BUFFER_CAST (obj);
bclass = GST_BASE_SINK_GET_CLASS (basesink);
sstart = sstop = -1;
if (bclass->get_times)
bclass->get_times (basesink, buffer, &sstart, &sstop);
GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
", stop: %" GST_TIME_FORMAT, GST_TIME_ARGS (sstart),
GST_TIME_ARGS (sstop));
if (G_LIKELY (basesink->segment.format == GST_FORMAT_TIME)) {
/* clip */
if (G_UNLIKELY (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
(gint64) sstart, (gint64) sstop, &cstart, &cstop)))
goto out_of_segment;
if (G_UNLIKELY (sstart != cstart || sstop != cstop)) {
GST_DEBUG_OBJECT (basesink, "clipped to: start %" GST_TIME_FORMAT
", stop: %" GST_TIME_FORMAT, GST_TIME_ARGS (cstart),
GST_TIME_ARGS (cstop));
}
/* save last valid times seen. */
if (GST_CLOCK_TIME_IS_VALID (cstop))
gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
(gint64) cstop);
else
gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
(gint64) cstart);
} else {
if (basesink->segment.accum == 0) {
/* no clipping for formats different from GST_FORMAT_TIME */
cstart = sstart;
cstop = sstop;
} else {
cstart = -1;
cstop = -1;
}
}
*start =
gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME, cstart);
*stop =
gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME, cstop);
/* buffers always need syncing and preroll */
return TRUE;
/* special cases */
out_of_segment:
{
/* should not happen, we return FALSE so that we don't try to
* sync on it. */
GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
(NULL), ("unexpected buffer out of segment found."));
GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
return FALSE;
}
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Waits for the clock to reach @time. If @time is not valid, no
* synchronisation is done.
* If synchronisation is disabled in the element or there is no
* clock, no synchronisation is done.
* Else 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.
*/
static GstClockReturn
gst_base_sink_wait_clock (GstBaseSink * basesink, GstClockTime time)
{
GstClockID id;
GstClockReturn ret;
GstClock *clock;
GstClockTime base_time;
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time)))
goto invalid_time;
GST_OBJECT_LOCK (basesink);
if (G_UNLIKELY (!basesink->sync))
goto no_sync;
if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (basesink)) == NULL))
goto no_clock;
base_time = GST_ELEMENT_CAST (basesink)->base_time;
id = gst_clock_new_single_shot_id (clock, base_time + time);
GST_OBJECT_UNLOCK (basesink);
basesink->clock_id = id;
/* release the preroll lock while waiting */
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
ret = gst_clock_id_wait (id, NULL);
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
gst_clock_id_unref (id);
basesink->clock_id = NULL;
return ret;
invalid_time:
{
GST_DEBUG_OBJECT (basesink, "time not valid, no sync needed");
return GST_CLOCK_OK;
}
no_sync:
{
GST_DEBUG_OBJECT (basesink, "sync disabled");
GST_OBJECT_UNLOCK (basesink);
return GST_CLOCK_OK;
}
no_clock:
{
GST_DEBUG_OBJECT (basesink, "no clock, can't sync");
GST_OBJECT_UNLOCK (basesink);
return GST_CLOCK_OK;
}
}
/* 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
* immediatly try to repreroll.
*
* Some objects do not need synchronisation (most events) and so this function
* immediatly returns GST_FLOW_OK.
*
* does not take ownership of obj.
*/
static GstFlowReturn
gst_base_sink_do_sync (GstBaseSink * basesink, GstPad * pad,
GstMiniObject * obj)
{
GstClockTime start, stop;
gboolean syncable;
GstClockReturn status = GST_CLOCK_OK;
/* get timing information for this object */
start = stop = -1;
syncable = gst_base_sink_get_sync_times (basesink, obj, &start, &stop);
/* a syncable object needs to participate in preroll and
* clocking. All buffers and EOS are syncable. */
if (G_UNLIKELY (!syncable))
goto not_syncable;
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.
*/
while (G_UNLIKELY (basesink->need_preroll)) {
GST_DEBUG_OBJECT (basesink, "prerolling object %p", obj);
if (G_LIKELY (basesink->playing_async)) {
basesink->playing_async = FALSE;
/* commit state */
if (G_UNLIKELY (!gst_base_sink_commit_state (basesink)))
goto stopping;
}
/* need to recheck here because the commit state could have
* made us not need the preroll anymore */
if (G_LIKELY (basesink->need_preroll)) {
/* block until the state changes, or we get a flush, or something */
GST_DEBUG_OBJECT (basesink, "waiting to finish preroll");
basesink->have_preroll = TRUE;
GST_PAD_PREROLL_WAIT (pad);
basesink->have_preroll = FALSE;
GST_DEBUG_OBJECT (basesink, "done preroll");
if (G_UNLIKELY (basesink->flushing))
goto flushing;
}
}
/* preroll done, we can sync since we ar in PLAYING now. */
GST_DEBUG_OBJECT (basesink, "waiting for clock");
basesink->end_time = stop;
status = gst_base_sink_wait_clock (basesink, start);
GST_DEBUG_OBJECT (basesink, "clock returned %d", status);
/* waiting could be 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");
goto again;
}
/* FIXME, update clock stats here and do some QoS */
return GST_FLOW_OK;
/* ERRORS */
not_syncable:
{
GST_DEBUG_OBJECT (basesink, "non syncable object %p", obj);
return GST_FLOW_OK;
}
flushing:
{
GST_DEBUG_OBJECT (basesink, "we are flushing");
return GST_FLOW_WRONG_STATE;
}
stopping:
{
GST_DEBUG_OBJECT (basesink, "stopping while commiting state");
return GST_FLOW_WRONG_STATE;
}
}
/* with STREAM_LOCK, PREROLL_LOCK,
*
* Synchronize the object on the clock and then render it.
*
* takes ownership of obj.
*/
static GstFlowReturn
gst_base_sink_render_object (GstBaseSink * basesink, GstPad * pad,
GstMiniObject * obj)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBaseSinkClass *bclass;
/* synchronize this object */
ret = gst_base_sink_do_sync (basesink, pad, obj);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto sync_failed;
/* and now render */
if (G_LIKELY (GST_IS_BUFFER (obj))) {
bclass = GST_BASE_SINK_GET_CLASS (basesink);
GST_DEBUG_OBJECT (basesink, "rendering buffer %p", obj);
if (G_LIKELY (bclass->render))
ret = bclass->render (basesink, GST_BUFFER_CAST (obj));
} else {
GstEvent *event = GST_EVENT_CAST (obj);
gboolean ok = TRUE;
GstEventType type;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
type = GST_EVENT_TYPE (event);
GST_DEBUG_OBJECT (basesink, "rendering event %p, type %s", obj,
gst_event_type_get_name (type));
if (bclass->event)
ok = bclass->event (basesink, event);
if (G_LIKELY (ok)) {
switch (type) {
case GST_EVENT_EOS:
/* 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");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_eos (GST_OBJECT_CAST (basesink)));
break;
case GST_EVENT_NEWSEGMENT:
/* configure the segment */
gst_base_sink_configure_segment (basesink, pad, event,
&basesink->segment);
default:
break;
}
}
}
GST_DEBUG_OBJECT (basesink, "object unref after render %p", obj);
gst_mini_object_unref (obj);
return ret;
/* ERRORS */
sync_failed:
{
GST_DEBUG_OBJECT (basesink, "do_sync returned %s, unref object %p",
gst_flow_get_name (ret), obj);
gst_mini_object_unref (obj);
return ret;
}
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Perform preroll on the given object. For buffers this means
* calling the preroll subclass method.
* If that succeeds, the state will be commited.
*
* function does not take ownership of obj.
*/
static GstFlowReturn
gst_base_sink_preroll_object (GstBaseSink * basesink, GstPad * pad,
GstMiniObject * obj)
{
GstFlowReturn ret;
GST_DEBUG_OBJECT (basesink, "do preroll %p", obj);
/* if it's a buffer, we need to call the preroll method */
if (G_LIKELY (GST_IS_BUFFER (obj))) {
GstBaseSinkClass *bclass;
GstBuffer *buf = GST_BUFFER_CAST (obj);
GST_DEBUG_OBJECT (basesink, "preroll buffer %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (bclass->preroll)
if ((ret = bclass->preroll (basesink, buf)) != GST_FLOW_OK)
goto preroll_failed;
}
/* commit state */
if (G_LIKELY (basesink->playing_async)) {
basesink->playing_async = FALSE;
if (G_UNLIKELY (!gst_base_sink_commit_state (basesink)))
goto stopping;
}
return GST_FLOW_OK;
/* ERRORS */
preroll_failed:
{
GST_DEBUG_OBJECT (basesink, "preroll failed, abort state");
gst_element_abort_state (GST_ELEMENT_CAST (basesink));
return ret;
}
stopping:
{
GST_DEBUG_OBJECT (basesink, "stopping while commiting state");
return GST_FLOW_WRONG_STATE;
}
}
/* with STREAM_LOCK, PREROLL_LOCK
*
* Queue an object for rendering.
* The first prerollable object queued will complete the preroll. If the
* preroll queue if filled, we render all the objects in the queue.
*
* This function takes ownership of the object.
*/
static GstFlowReturn
gst_base_sink_queue_object_unlocked (GstBaseSink * basesink, GstPad * pad,
GstMiniObject * obj, gboolean prerollable)
{
GstFlowReturn ret = GST_FLOW_OK;
gint length;
GQueue *q;
if (G_UNLIKELY (basesink->need_preroll)) {
if (G_LIKELY (prerollable))
basesink->preroll_queued++;
length = basesink->preroll_queued;
GST_DEBUG_OBJECT (basesink, "now %d prerolled items", length);
/* first prerollable item needs to finish the preroll */
if (length == 1) {
ret = gst_base_sink_preroll_object (basesink, pad, obj);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto preroll_failed;
}
/* need to recheck if we need preroll, commmit state during preroll
* could have made us not need more preroll. */
if (G_UNLIKELY (basesink->need_preroll)) {
/* see if we can render now. */
if (G_UNLIKELY (length <= basesink->preroll_queue_max_len))
goto more_preroll;
}
}
/* we can start rendering (or blocking) the queued object
* if any. */
q = basesink->preroll_queue;
while (G_UNLIKELY (!g_queue_is_empty (q))) {
GstMiniObject *o;
o = g_queue_pop_head (q);
GST_DEBUG_OBJECT (basesink, "rendering queued object %p", o);
/* FIXME, do something with the return value? */
ret = gst_base_sink_render_object (basesink, pad, o);
}
/* now render the object */
ret = gst_base_sink_render_object (basesink, pad, obj);
basesink->preroll_queued = 0;
return ret;
/* special cases */
preroll_failed:
{
GST_DEBUG_OBJECT (basesink, "preroll failed, reason %s",
gst_flow_get_name (ret));
gst_mini_object_unref (obj);
return ret;
}
more_preroll:
{
/* add object to the queue and return */
GST_DEBUG_OBJECT (basesink, "need more preroll data %d <= %d",
length, basesink->preroll_queue_max_len);
g_queue_push_tail (basesink->preroll_queue, obj);
return GST_FLOW_OK;
}
}
/* with STREAM_LOCK
*
* This function grabs the PREROLL_LOCK and adds the object to
* the queue.
*
* This function takes ownership of obj.
*/
static GstFlowReturn
gst_base_sink_queue_object (GstBaseSink * basesink, GstPad * pad,
GstMiniObject * obj, gboolean prerollable)
{
GstFlowReturn ret;
GST_PAD_PREROLL_LOCK (pad);
if (G_UNLIKELY (basesink->flushing))
goto flushing;
ret = gst_base_sink_queue_object_unlocked (basesink, pad, obj, prerollable);
GST_PAD_PREROLL_UNLOCK (pad);
return ret;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (basesink, "sink is flushing");
GST_PAD_PREROLL_UNLOCK (pad);
gst_mini_object_unref (obj);
return GST_FLOW_WRONG_STATE;
}
}
static gboolean
gst_base_sink_event (GstPad * pad, GstEvent * event)
{
GstBaseSink *basesink;
gboolean result = TRUE;
GstBaseSinkClass *bclass;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
bclass = GST_BASE_SINK_GET_CLASS (basesink);
GST_DEBUG_OBJECT (basesink, "event %p", event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
{
GstFlowReturn ret;
/* EOS is a prerollable object */
ret =
gst_base_sink_queue_object (basesink, pad,
GST_MINI_OBJECT_CAST (event), TRUE);
if (G_UNLIKELY (ret != GST_FLOW_OK))
result = FALSE;
break;
}
case GST_EVENT_NEWSEGMENT:
{
GstFlowReturn ret;
basesink->have_newsegment = TRUE;
/* the new segment is a non prerollable item and does not block anything,
* we need to configure the current clipping segment and insert the event
* in the queue to serialize it with the buffers for rendering. */
gst_base_sink_configure_segment (basesink, pad, event,
basesink->abidata.ABI.clip_segment);
ret =
gst_base_sink_queue_object (basesink, pad,
GST_MINI_OBJECT_CAST (event), FALSE);
if (G_UNLIKELY (ret != GST_FLOW_OK))
result = FALSE;
break;
}
case GST_EVENT_FLUSH_START:
if (bclass->event)
bclass->event (basesink, event);
/* 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);
/* and we need to commit our state again on the next
* prerolled buffer */
basesink->playing_async = TRUE;
gst_element_lost_state (GST_ELEMENT_CAST (basesink));
GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
GST_PAD_STREAM_UNLOCK (pad);
gst_event_unref (event);
break;
case GST_EVENT_FLUSH_STOP:
if (bclass->event)
bclass->event (basesink, event);
/* unset flushing so we can accept new data */
gst_base_sink_set_flushing (basesink, pad, FALSE);
/* we need new segment info after the flush. */
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
gst_segment_init (basesink->abidata.ABI.clip_segment,
GST_FORMAT_UNDEFINED);
basesink->have_newsegment = FALSE;
GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
gst_event_unref (event);
break;
default:
/* other events are sent to queue or subclass depending on if they
* are serialized. */
if (GST_EVENT_IS_SERIALIZED (event)) {
gst_base_sink_queue_object (basesink, pad,
GST_MINI_OBJECT_CAST (event), FALSE);
} else {
if (bclass->event)
bclass->event (basesink, event);
gst_event_unref (event);
}
break;
}
gst_object_unref (basesink);
return result;
}
/* default implementation to calculate the start and end
* timestamps on a buffer, subclasses can override
*/
static void
gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end)
{
GstClockTime timestamp, duration;
timestamp = GST_BUFFER_TIMESTAMP (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_is_prerolled (GstBaseSink * basesink)
{
gboolean res;
res = basesink->have_preroll || basesink->eos;
GST_DEBUG_OBJECT (basesink, "have_preroll: %d, EOS: %d => prerolled: %d",
basesink->have_preroll, basesink->eos, res);
return res;
}
/* 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 queue the buffer for preroll and rendering.
*
* This function takes ownership of the buffer.
*/
static GstFlowReturn
gst_base_sink_chain_unlocked (GstBaseSink * basesink, GstPad * pad,
GstBuffer * buf)
{
GstFlowReturn result;
GstClockTime start = -1, end = -1;
if (G_UNLIKELY (basesink->flushing))
goto flushing;
if (G_UNLIKELY (!basesink->have_newsegment)) {
gboolean sync;
GST_OBJECT_LOCK (basesink);
sync = basesink->sync;
GST_OBJECT_UNLOCK (basesink);
if (sync) {
GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
(_("Internal data flow problem.")),
("Received buffer without a new-segment. Cannot sync to clock."));
}
basesink->have_newsegment = TRUE;
/* this means this sink will not be able to sync to the clock */
basesink->abidata.ABI.clip_segment->start = -1;
basesink->abidata.ABI.clip_segment->stop = -1;
basesink->segment.start = -1;
basesink->segment.stop = -1;
}
/* check if the buffer needs to be dropped */
/* we don't use the subclassed method as it may not return
* valid values for our purpose here */
gst_base_sink_get_times (basesink, 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));
if (GST_CLOCK_TIME_IS_VALID (start) &&
(basesink->abidata.ABI.clip_segment->format == GST_FORMAT_TIME)) {
if (G_UNLIKELY (!gst_segment_clip (basesink->abidata.ABI.clip_segment,
GST_FORMAT_TIME, (gint64) start, (gint64) end, NULL, NULL)))
goto out_of_segment;
}
/* now we can process the buffer in the queue, this function takes ownership
* of the buffer */
result =
gst_base_sink_queue_object_unlocked (basesink, pad,
GST_MINI_OBJECT_CAST (buf), TRUE);
return result;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (basesink, "sink is flushing");
gst_buffer_unref (buf);
return GST_FLOW_WRONG_STATE;
}
out_of_segment:
{
GST_DEBUG_OBJECT (basesink, "dropping buffer, out of clipping segment");
gst_buffer_unref (buf);
return GST_FLOW_OK;
}
}
/* with STREAM_LOCK
*/
static GstFlowReturn
gst_base_sink_chain (GstPad * pad, GstBuffer * buf)
{
GstBaseSink *basesink;
GstFlowReturn result;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH))
goto wrong_mode;
GST_PAD_PREROLL_LOCK (pad);
result = gst_base_sink_chain_unlocked (basesink, pad, buf);
GST_PAD_PREROLL_UNLOCK (pad);
done:
gst_object_unref (basesink);
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_buffer_unref (buf);
/* we don't post an error message this will signal to the peer
* pushing that EOS is reached. */
result = GST_FLOW_UNEXPECTED;
goto done;
}
}
/* with STREAM_LOCK
*/
static void
gst_base_sink_loop (GstPad * pad)
{
GstBaseSink *basesink;
GstBuffer *buf = NULL;
GstFlowReturn result;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
g_assert (basesink->pad_mode == GST_ACTIVATE_PULL);
result = gst_pad_pull_range (pad, basesink->offset, DEFAULT_SIZE, &buf);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto paused;
if (G_UNLIKELY (buf == NULL))
goto no_buffer;
GST_PAD_PREROLL_LOCK (pad);
result = gst_base_sink_chain_unlocked (basesink, pad, buf);
GST_PAD_PREROLL_UNLOCK (pad);
if (G_UNLIKELY (result != GST_FLOW_OK))
goto paused;
gst_object_unref (basesink);
return;
/* ERRORS */
paused:
{
GST_LOG_OBJECT (basesink, "pausing task, reason %s",
gst_flow_get_name (result));
gst_pad_pause_task (pad);
/* fatal errors and NOT_LINKED cause EOS */
if (GST_FLOW_IS_FATAL (result) || result == GST_FLOW_NOT_LINKED) {
gst_base_sink_event (pad, gst_event_new_eos ());
/* EOS does not cause an ERROR message */
if (result != GST_FLOW_UNEXPECTED) {
GST_ELEMENT_ERROR (basesink, STREAM, FAILED,
(_("Internal data stream error.")),
("stream stopped, reason %s", gst_flow_get_name (result)));
}
}
gst_object_unref (basesink);
return;
}
no_buffer:
{
GST_LOG_OBJECT (basesink, "no buffer, pausing");
result = GST_FLOW_ERROR;
goto paused;
}
}
static gboolean
gst_base_sink_set_flushing (GstBaseSink * basesink, GstPad * pad,
gboolean flushing)
{
GST_PAD_PREROLL_LOCK (pad);
basesink->flushing = flushing;
if (flushing) {
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
/* step 1, unblock clock sync (if any) or any other blocking thing */
basesink->need_preroll = TRUE;
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
/* unlock any subclasses */
if (bclass->unlock)
bclass->unlock (basesink);
/* flush out the data thread if it's locked in finish_preroll */
GST_DEBUG_OBJECT (basesink,
"flushing out data thread, need preroll to TRUE");
gst_base_sink_preroll_queue_flush (basesink, pad);
}
GST_PAD_PREROLL_UNLOCK (pad);
return TRUE;
}
static gboolean
gst_base_sink_deactivate (GstBaseSink * basesink, GstPad * pad)
{
gboolean result;
gst_base_sink_set_flushing (basesink, pad, TRUE);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
return result;
}
static gboolean
gst_base_sink_activate (GstPad * pad)
{
gboolean result = FALSE;
GstBaseSink *basesink;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (basesink, "Trying pull mode first");
gst_base_sink_set_flushing (basesink, pad, FALSE);
if (basesink->can_activate_pull && gst_pad_check_pull_range (pad)
&& gst_pad_activate_pull (pad, TRUE)) {
GST_DEBUG_OBJECT (basesink, "Success activating pull mode");
result = TRUE;
} else {
GST_DEBUG_OBJECT (basesink, "Falling back to push mode");
if (gst_pad_activate_push (pad, TRUE)) {
GST_DEBUG_OBJECT (basesink, "Success activating push mode");
result = TRUE;
}
}
if (!result) {
GST_WARNING_OBJECT (basesink, "Could not activate pad in either mode");
gst_base_sink_set_flushing (basesink, pad, TRUE);
}
gst_object_unref (basesink);
return result;
}
static gboolean
gst_base_sink_activate_push (GstPad * pad, gboolean active)
{
gboolean result;
GstBaseSink *basesink;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
if (active) {
if (!basesink->can_activate_push) {
result = FALSE;
basesink->pad_mode = GST_ACTIVATE_NONE;
} else {
result = TRUE;
basesink->pad_mode = GST_ACTIVATE_PUSH;
}
} else {
if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH)) {
g_warning ("Internal GStreamer activation error!!!");
result = FALSE;
} else {
result = gst_base_sink_deactivate (basesink, pad);
basesink->pad_mode = GST_ACTIVATE_NONE;
}
}
gst_object_unref (basesink);
return result;
}
/* this won't get called until we implement an activate function */
static gboolean
gst_base_sink_activate_pull (GstPad * pad, gboolean active)
{
gboolean result = FALSE;
GstBaseSink *basesink;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
if (active) {
if (!basesink->can_activate_pull) {
result = FALSE;
basesink->pad_mode = GST_ACTIVATE_NONE;
} else {
GstPad *peer = gst_pad_get_peer (pad);
if (G_UNLIKELY (peer == NULL)) {
g_warning ("Trying to activate pad in pull mode, but no peer");
result = FALSE;
basesink->pad_mode = GST_ACTIVATE_NONE;
} else {
if (gst_pad_activate_pull (peer, TRUE)) {
/* 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_UNDEFINED);
gst_segment_init (basesink->abidata.ABI.clip_segment,
GST_FORMAT_UNDEFINED);
basesink->have_newsegment = TRUE;
/* set the pad mode before starting the task so that it's in the
correct state for the new thread... */
basesink->pad_mode = GST_ACTIVATE_PULL;
result =
gst_pad_start_task (pad, (GstTaskFunction) gst_base_sink_loop,
pad);
/* but if starting the thread fails, set it back */
if (!result)
basesink->pad_mode = GST_ACTIVATE_NONE;
} else {
GST_DEBUG_OBJECT (pad, "Failed to activate peer in pull mode");
result = FALSE;
basesink->pad_mode = GST_ACTIVATE_NONE;
}
gst_object_unref (peer);
}
}
} else {
if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PULL)) {
g_warning ("Internal GStreamer activation error!!!");
result = FALSE;
} else {
result = gst_base_sink_deactivate (basesink, pad);
basesink->pad_mode = GST_ACTIVATE_NONE;
}
}
gst_object_unref (basesink);
return result;
}
/* 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 result;
GST_OBJECT_LOCK (element);
pad = basesink->sinkpad;
gst_object_ref (pad);
GST_OBJECT_UNLOCK (element);
result = gst_pad_push_event (pad, event);
gst_object_unref (pad);
return result;
}
static gboolean
gst_base_sink_peer_query (GstBaseSink * sink, GstQuery * query)
{
GstPad *peer;
gboolean res = FALSE;
if ((peer = gst_pad_get_peer (sink->sinkpad))) {
res = gst_pad_query (peer, query);
gst_object_unref (peer);
}
return res;
}
static gboolean
gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
gint64 * cur)
{
GstClock *clock;
gboolean res = FALSE;
switch (format) {
case GST_FORMAT_TIME:
{
GstClockTime now, base;
gint64 time, accum;
gdouble abs_rate;
/* we can answer time format */
GST_OBJECT_LOCK (basesink);
/* can only give answer if not EOS */
if (G_UNLIKELY (basesink->eos))
goto wrong_state;
/* We get position from clock only in PLAYING */
if (GST_STATE (basesink) != GST_STATE_PLAYING)
goto wrong_state;
/* and we need a clock */
if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (basesink)) == NULL))
goto wrong_state;
/* collect all data we need holding the lock */
if (GST_CLOCK_TIME_IS_VALID (basesink->segment.time))
time = basesink->segment.time;
else
time = 0;
base = GST_ELEMENT_CAST (basesink)->base_time;
accum = basesink->segment.accum;
abs_rate = basesink->segment.abs_rate;
gst_object_ref (clock);
/* need to release the object lock before we can get the time */
GST_OBJECT_UNLOCK (basesink);
now = gst_clock_get_time (clock);
base += accum;
base = MIN (now, base);
*cur = gst_guint64_to_gdouble (now - base) * abs_rate + time;
GST_DEBUG_OBJECT (basesink,
"now %" GST_TIME_FORMAT " - base %" GST_TIME_FORMAT " - accum %"
GST_TIME_FORMAT " + time %" GST_TIME_FORMAT " = %" GST_TIME_FORMAT,
GST_TIME_ARGS (now), GST_TIME_ARGS (base),
GST_TIME_ARGS (accum), GST_TIME_ARGS (time), GST_TIME_ARGS (*cur));
gst_object_unref (clock);
res = TRUE;
}
default:
/* cannot answer other than TIME */
break;
}
return res;
wrong_state:
{
GST_OBJECT_UNLOCK (basesink);
return FALSE;
}
}
static gboolean
gst_base_sink_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;
gst_query_parse_position (query, &format, NULL);
GST_DEBUG_OBJECT (basesink, "current position format %d", format);
/* first try to get the position based on the clock */
if ((res = gst_base_sink_get_position (basesink, format, &cur))) {
gst_query_set_position (query, format, cur);
} else {
/* fallback to peer query */
res = gst_base_sink_peer_query (basesink, query);
}
break;
}
case GST_QUERY_DURATION:
res = gst_base_sink_peer_query (basesink, query);
break;
case GST_QUERY_LATENCY:
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:
{
/* FIXME, bring start/stop to stream time */
gst_query_set_segment (query, basesink->segment.rate,
GST_FORMAT_TIME, basesink->segment.start, basesink->segment.stop);
break;
}
case GST_QUERY_SEEKING:
case GST_QUERY_CONVERT:
case GST_QUERY_FORMATS:
default:
res = gst_base_sink_peer_query (basesink, query);
break;
}
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;
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_DEBUG_OBJECT (basesink, "READY to PAUSED, need preroll");
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
gst_segment_init (basesink->abidata.ABI.clip_segment,
GST_FORMAT_UNDEFINED);
basesink->have_newsegment = FALSE;
basesink->offset = 0;
basesink->have_preroll = FALSE;
basesink->need_preroll = TRUE;
basesink->playing_async = TRUE;
basesink->eos = FALSE;
ret = GST_STATE_CHANGE_ASYNC;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
if (gst_base_sink_is_prerolled (basesink)) {
/* no preroll needed anymore now. */
GST_DEBUG_OBJECT (basesink, "PAUSED to PLAYING, don't need preroll");
basesink->playing_async = FALSE;
basesink->need_preroll = FALSE;
if (basesink->eos) {
/* need to post EOS message here */
GST_DEBUG_OBJECT (basesink, "Now posting EOS");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_eos (GST_OBJECT_CAST (basesink)));
} else {
GST_DEBUG_OBJECT (basesink, "signal preroll");
GST_PAD_PREROLL_SIGNAL (basesink->sinkpad);
}
} else {
GST_DEBUG_OBJECT (basesink, "PAUSED to PLAYING, need preroll");
basesink->need_preroll = TRUE;
basesink->playing_async = TRUE;
ret = GST_STATE_CHANGE_ASYNC;
}
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
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_PLAYING_TO_PAUSED:
GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED");
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
basesink->need_preroll = TRUE;
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
if (bclass->unlock)
bclass->unlock (basesink);
/* if we don't have a preroll buffer we need to wait for a preroll and
* return ASYNC. */
if (gst_base_sink_is_prerolled (basesink)) {
basesink->playing_async = FALSE;
} else {
GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED, need preroll");
basesink->playing_async = TRUE;
ret = GST_STATE_CHANGE_ASYNC;
}
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (bclass->stop)
if (!bclass->stop (basesink)) {
GST_WARNING_OBJECT (basesink, "failed to stop");
}
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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