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gstreamer/libs/gst/base/gstbasesink.c
Wim Taymans 588e11ad39 libs/gst/: Documentation updates. 
Original commit message from CVS:
* libs/gst/base/gstadapter.c:
* libs/gst/base/gstadapter.h:
* libs/gst/base/gstbasesink.c: (gst_base_sink_class_init),
(gst_base_sink_get_position):
* libs/gst/base/gstbasesink.h:
* libs/gst/base/gstbasesrc.c: (gst_base_src_class_init),
(gst_base_src_default_query), (gst_base_src_default_do_seek),
(gst_base_src_do_seek), (gst_base_src_perform_seek),
(gst_base_src_send_event), (gst_base_src_update_length),
(gst_base_src_get_range), (gst_base_src_loop),
(gst_base_src_start):
* libs/gst/base/gstbasesrc.h:
* libs/gst/base/gstbasetransform.h:
* libs/gst/base/gstcollectpads.h:
* libs/gst/base/gstpushsrc.c:
* libs/gst/base/gstpushsrc.h:
* libs/gst/dataprotocol/dataprotocol.c:
* libs/gst/dataprotocol/dataprotocol.h:
* libs/gst/net/gstnetclientclock.h:
* libs/gst/net/gstnettimeprovider.h:
Documentation updates.
2005-12-18 16:04:41 +00:00

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/* GStreamer
* Copyright (C) 2005 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 sync property to FALSE.
*
* After synchronisation the virtual method #GstBaseSink::render will be called.
* Subclasses should minimally implement this method.
*
* Upon receiving the EOS event in th 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,
* 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 however, 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 2005-12-18 (0.10.0)
*/
#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 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 inline GstFlowReturn gst_base_sink_handle_buffer (GstBaseSink * basesink,
GstBuffer * buf);
static inline gboolean gst_base_sink_handle_event (GstBaseSink * basesink,
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 (basesink), basesink->sinkpad);
basesink->pad_mode = GST_ACTIVATE_NONE;
GST_PAD_TASK (basesink->sinkpad) = NULL;
basesink->preroll_queue = g_queue_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);
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:
sink->sync = g_value_get_boolean (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);
GST_OBJECT_LOCK (sink);
switch (prop_id) {
case PROP_PREROLL_QUEUE_LEN:
g_value_set_uint (value, sink->preroll_queue_max_len);
break;
case PROP_SYNC:
g_value_set_boolean (value, sink->sync);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (sink);
}
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 */
static GstFlowReturn
gst_base_sink_preroll_queue_empty (GstBaseSink * basesink, GstPad * pad)
{
GstMiniObject *obj;
GQueue *q = basesink->preroll_queue;
GstFlowReturn ret;
ret = GST_FLOW_OK;
if (q) {
GST_DEBUG_OBJECT (basesink, "emptying queue");
while ((obj = g_queue_pop_head (q))) {
gboolean is_buffer;
is_buffer = GST_IS_BUFFER (obj);
if (G_LIKELY (is_buffer)) {
basesink->preroll_queued--;
basesink->buffers_queued--;
} else {
switch (GST_EVENT_TYPE (obj)) {
case GST_EVENT_EOS:
basesink->preroll_queued--;
break;
default:
break;
}
basesink->events_queued--;
}
/* we release the preroll lock while pushing so that we
* can still flush it while blocking on the clock or
* inside the element. */
GST_PAD_PREROLL_UNLOCK (pad);
if (G_LIKELY (is_buffer)) {
GST_DEBUG_OBJECT (basesink, "popped buffer %p", obj);
ret = gst_base_sink_handle_buffer (basesink, GST_BUFFER_CAST (obj));
} else {
GST_DEBUG_OBJECT (basesink, "popped event %p", obj);
gst_base_sink_handle_event (basesink, GST_EVENT_CAST (obj));
ret = GST_FLOW_OK;
}
GST_PAD_PREROLL_LOCK (pad);
}
GST_DEBUG_OBJECT (basesink, "queue empty");
}
return ret;
}
/* with PREROLL_LOCK */
static void
gst_base_sink_preroll_queue_flush (GstBaseSink * basesink, GstPad * pad)
{
GstMiniObject *obj;
GQueue *q = basesink->preroll_queue;
GST_DEBUG_OBJECT (basesink, "flushing queue %p", basesink);
if (q) {
while ((obj = g_queue_pop_head (q))) {
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 PREROLL_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:
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:
basesink->need_preroll = TRUE;
post_paused = TRUE;
post_pending = GST_STATE_VOID_PENDING;
break;
case GST_STATE_READY:
goto stopping;
default:
break;
}
if (pending != GST_STATE_VOID_PENDING) {
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;
stopping:
{
/* app is going to READY */
GST_OBJECT_UNLOCK (basesink);
return FALSE;
}
}
/* with STREAM_LOCK */
static GstFlowReturn
gst_base_sink_handle_object (GstBaseSink * basesink, GstPad * pad,
GstMiniObject * obj)
{
gint length;
gboolean have_event;
GstFlowReturn ret;
GST_PAD_PREROLL_LOCK (pad);
/* push object on the queue */
GST_DEBUG_OBJECT (basesink, "push %p on preroll_queue", obj);
g_queue_push_tail (basesink->preroll_queue, obj);
have_event = GST_IS_EVENT (obj);
if (have_event) {
GstEvent *event = GST_EVENT (obj);
switch (GST_EVENT_TYPE (obj)) {
case GST_EVENT_EOS:
basesink->preroll_queued++;
basesink->eos = TRUE;
basesink->eos_queued = TRUE;
break;
case GST_EVENT_NEWSEGMENT:
{
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);
basesink->have_newsegment = TRUE;
gst_segment_set_newsegment (&basesink->segment, update, rate, format,
start, stop, time);
GST_DEBUG_OBJECT (basesink,
"received NEWSEGMENT %" GST_TIME_FORMAT " -- %"
GST_TIME_FORMAT ", time %" GST_TIME_FORMAT ", accum %"
GST_TIME_FORMAT,
GST_TIME_ARGS (basesink->segment.start),
GST_TIME_ARGS (basesink->segment.stop),
GST_TIME_ARGS (basesink->segment.time),
GST_TIME_ARGS (basesink->segment.accum));
break;
}
default:
break;
}
basesink->events_queued++;
} else {
GstBuffer *buf = GST_BUFFER (obj);
if (!basesink->have_newsegment) {
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->segment.start = -1;
basesink->segment.stop = -1;
}
/* check if the buffer needs to be dropped */
if (TRUE) {
GstClockTime start = -1, end = -1;
/* 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->segment.format == GST_FORMAT_TIME)) {
if (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
(gint64) start, (gint64) end, NULL, NULL))
goto dropping;
}
}
basesink->preroll_queued++;
basesink->buffers_queued++;
}
GST_DEBUG_OBJECT (basesink,
"now %d preroll, %d buffers, %d events on queue",
basesink->preroll_queued,
basesink->buffers_queued, basesink->events_queued);
/* check if we are prerolling */
if (!basesink->need_preroll)
goto no_preroll;
/* there is a buffer queued */
if (basesink->buffers_queued == 1) {
GST_DEBUG_OBJECT (basesink, "do preroll %p", obj);
/* if it's a buffer, we need to call the preroll method */
if (GST_IS_BUFFER (obj)) {
GstBaseSinkClass *bclass;
GstBuffer *buf = GST_BUFFER (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;
}
}
length = basesink->preroll_queued;
GST_DEBUG_OBJECT (basesink, "prerolled length %d", length);
if (length == 1) {
basesink->have_preroll = TRUE;
/* commit state */
if (!gst_base_sink_commit_state (basesink))
goto stopping;
GST_OBJECT_LOCK (pad);
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
goto flushing;
GST_OBJECT_UNLOCK (pad);
/* it is possible that commiting the state made us go to PLAYING
* now in which case we don't need to block anymore. */
if (!basesink->need_preroll)
goto no_preroll;
length = basesink->preroll_queued;
/* FIXME: a pad probe could have made us lose the buffer, according
* to one of the python tests */
if (length == 0) {
GST_ERROR_OBJECT (basesink,
"preroll_queued dropped from 1 to 0 while committing state change");
}
g_assert (length <= 1);
}
/* see if we need to block now. We cannot block on events, only
* on buffers, the reason is that events can be sent from the
* application thread and we don't want to block there. */
if (length > basesink->preroll_queue_max_len && !have_event) {
/* block until the state changes, or we get a flush, or something */
GST_DEBUG_OBJECT (basesink, "waiting to finish preroll");
GST_PAD_PREROLL_WAIT (pad);
GST_DEBUG_OBJECT (basesink, "done preroll");
GST_OBJECT_LOCK (pad);
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
goto flushing;
GST_OBJECT_UNLOCK (pad);
}
GST_PAD_PREROLL_UNLOCK (pad);
return GST_FLOW_OK;
no_preroll:
{
GST_DEBUG_OBJECT (basesink, "no preroll needed");
/* maybe it was another sink that blocked in preroll, need to check for
buffers to drain */
basesink->have_preroll = FALSE;
ret = gst_base_sink_preroll_queue_empty (basesink, pad);
GST_PAD_PREROLL_UNLOCK (pad);
return ret;
}
dropping:
{
GstBuffer *buf;
GST_DEBUG_OBJECT (basesink, "dropping buffer");
buf = GST_BUFFER (g_queue_pop_tail (basesink->preroll_queue));
gst_buffer_unref (buf);
GST_PAD_PREROLL_UNLOCK (pad);
return GST_FLOW_OK;
}
flushing:
{
GST_OBJECT_UNLOCK (pad);
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PAD_PREROLL_UNLOCK (pad);
GST_DEBUG_OBJECT (basesink, "pad is flushing");
return GST_FLOW_WRONG_STATE;
}
stopping:
{
GST_PAD_PREROLL_UNLOCK (pad);
GST_DEBUG_OBJECT (basesink, "stopping");
return GST_FLOW_WRONG_STATE;
}
preroll_failed:
{
GST_DEBUG_OBJECT (basesink, "preroll failed");
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PAD_PREROLL_UNLOCK (pad);
GST_DEBUG_OBJECT (basesink, "abort state");
gst_element_abort_state (GST_ELEMENT (basesink));
return ret;
}
}
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 also finishes the preroll */
ret =
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
break;
}
case GST_EVENT_NEWSEGMENT:
{
GstFlowReturn ret;
ret =
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
break;
}
case GST_EVENT_FLUSH_START:
/* make sure we are not blocked on the clock also clear any pending
* eos state. */
if (bclass->event)
bclass->event (basesink, event);
GST_OBJECT_LOCK (basesink);
basesink->flushing = TRUE;
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_OBJECT_UNLOCK (basesink);
GST_PAD_PREROLL_LOCK (pad);
/* we need preroll after the flush */
GST_DEBUG_OBJECT (basesink, "flushing, need preroll after flush");
basesink->need_preroll = TRUE;
/* unlock from a possible state change/preroll */
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PAD_PREROLL_UNLOCK (pad);
/* and we need to commit our state again on the next
* prerolled buffer */
GST_PAD_STREAM_LOCK (pad);
gst_element_lost_state (GST_ELEMENT (basesink));
GST_PAD_STREAM_UNLOCK (pad);
GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
gst_event_unref (event);
break;
case GST_EVENT_FLUSH_STOP:
if (bclass->event)
bclass->event (basesink, event);
/* now we are completely unblocked and the _chain method
* will return */
GST_OBJECT_LOCK (basesink);
basesink->flushing = FALSE;
GST_OBJECT_UNLOCK (basesink);
/* we need new segment info after the flush. */
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
gst_event_unref (event);
break;
default:
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;
}
}
/* with STREAM_LOCK and LOCK*/
static GstClockReturn
gst_base_sink_wait (GstBaseSink * basesink, GstClockTime time)
{
GstClockReturn ret;
GstClockID id;
/* no need to attempt a clock wait if we are flushing */
if (basesink->flushing) {
return GST_CLOCK_UNSCHEDULED;
}
/* clock_id should be NULL outside of this function */
g_assert (basesink->clock_id == NULL);
g_assert (GST_CLOCK_TIME_IS_VALID (time));
id = gst_clock_new_single_shot_id (GST_ELEMENT_CLOCK (basesink), time);
basesink->clock_id = id;
/* release the object lock while waiting */
GST_OBJECT_UNLOCK (basesink);
ret = gst_clock_id_wait (id, NULL);
GST_OBJECT_LOCK (basesink);
gst_clock_id_unref (id);
basesink->clock_id = NULL;
return ret;
}
/* perform synchronisation on a buffer
*
* 1) check if we have a clock, if not, do nothing
* 2) calculate the start and end time of the buffer
* 3) create a single shot notification to wait on
* the clock, save the entry so we can unlock it
* 4) wait on the clock, this blocks
* 5) unref the clockid again
*/
static GstClockReturn
gst_base_sink_do_sync (GstBaseSink * basesink, GstBuffer * buffer)
{
GstClockReturn result = GST_CLOCK_OK;
GstClockTime start, end;
gint64 cstart, cend;
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
start = end = -1;
if (bclass->get_times)
bclass->get_times (basesink, buffer, &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 we don't have a timestamp, we don't sync */
if (!GST_CLOCK_TIME_IS_VALID (start)) {
GST_DEBUG_OBJECT (basesink, "start not valid");
goto done;
}
if (basesink->segment.format == GST_FORMAT_TIME) {
/* save last times seen. */
if (GST_CLOCK_TIME_IS_VALID (end))
gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
(gint64) end);
else
gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_TIME,
(gint64) start);
/* clip */
if (!gst_segment_clip (&basesink->segment, GST_FORMAT_TIME,
(gint64) start, (gint64) end, &cstart, &cend))
goto out_of_segment;
} else {
/* no clipping for formats different from GST_FORMAT_TIME */
cstart = start;
cend = end;
}
if (!basesink->sync) {
GST_DEBUG_OBJECT (basesink, "no need to sync");
goto done;
}
/* now do clocking */
if (GST_ELEMENT_CLOCK (basesink)
&& ((basesink->segment.format == GST_FORMAT_TIME)
|| (basesink->segment.accum == 0))) {
GstClockTime base_time;
GstClockTimeDiff stream_start, stream_end;
stream_start =
gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME,
cstart);
stream_end =
gst_segment_to_running_time (&basesink->segment, GST_FORMAT_TIME, cend);
GST_OBJECT_LOCK (basesink);
base_time = GST_ELEMENT_CAST (basesink)->base_time;
GST_LOG_OBJECT (basesink,
"waiting for clock, base time %" GST_TIME_FORMAT
" stream_start %" GST_TIME_FORMAT,
GST_TIME_ARGS (base_time), GST_TIME_ARGS (stream_start));
/* also save end_time of this buffer so that we can wait
* to signal EOS */
if (GST_CLOCK_TIME_IS_VALID (stream_end))
basesink->end_time = stream_end + base_time;
else
basesink->end_time = GST_CLOCK_TIME_NONE;
result = gst_base_sink_wait (basesink, stream_start + base_time);
GST_OBJECT_UNLOCK (basesink);
GST_LOG_OBJECT (basesink, "clock entry done: %d", result);
} else {
GST_DEBUG_OBJECT (basesink, "no clock, not syncing");
}
done:
return result;
out_of_segment:
{
GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
return GST_CLOCK_UNSCHEDULED;
}
}
/* handle an event
*
* 2) render the event
* 3) unref the event
*/
static inline gboolean
gst_base_sink_handle_event (GstBaseSink * basesink, GstEvent * event)
{
GstBaseSinkClass *bclass;
gboolean ret;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_OBJECT_LOCK (basesink);
if (GST_ELEMENT_CLOCK (basesink)) {
/* wait for last buffer to finish if we have a valid end time */
if (GST_CLOCK_TIME_IS_VALID (basesink->end_time)) {
gst_base_sink_wait (basesink, basesink->end_time);
basesink->end_time = GST_CLOCK_TIME_NONE;
}
}
GST_OBJECT_UNLOCK (basesink);
break;
default:
break;
}
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (bclass->event)
ret = bclass->event (basesink, event);
else
ret = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
/* if we are still EOS, we can post the EOS message */
if (basesink->eos) {
/* 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)));
basesink->eos_queued = FALSE;
}
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
break;
default:
break;
}
GST_DEBUG_OBJECT (basesink, "event unref %p %p", basesink, event);
gst_event_unref (event);
return ret;
}
/* handle a buffer
*
* 1) first sync on the buffer
* 2) render the buffer
* 3) unref the buffer
*/
static inline GstFlowReturn
gst_base_sink_handle_buffer (GstBaseSink * basesink, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstClockReturn status;
status = gst_base_sink_do_sync (basesink, buf);
switch (status) {
case GST_CLOCK_EARLY:
GST_DEBUG_OBJECT (basesink, "buffer too late!, rendering anyway");
/* fallthrough for now */
case GST_CLOCK_OK:
{
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (bclass->render)
ret = bclass->render (basesink, buf);
break;
}
default:
GST_DEBUG_OBJECT (basesink, "clock returned %d, not rendering", status);
break;
}
GST_DEBUG_OBJECT (basesink, "buffer unref after render %p", basesink, buf);
gst_buffer_unref (buf);
return ret;
}
static GstFlowReturn
gst_base_sink_chain (GstPad * pad, GstBuffer * buf)
{
GstBaseSink *basesink;
GstFlowReturn result;
basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
if (!(basesink->pad_mode == GST_ACTIVATE_PUSH)) {
GST_OBJECT_LOCK (pad);
g_warning ("Push on pad %s:%s, but it was not activated in push mode",
GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_UNLOCK (pad);
result = GST_FLOW_UNEXPECTED;
goto done;
}
result =
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT_CAST (buf));
done:
gst_object_unref (basesink);
return result;
}
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 (result != GST_FLOW_OK)
goto paused;
result = gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (buf));
if (result != GST_FLOW_OK)
goto paused;
gst_object_unref (basesink);
/* default */
return;
paused:
{
gst_base_sink_event (pad, gst_event_new_eos ());
gst_object_unref (basesink);
gst_pad_pause_task (pad);
return;
}
}
static gboolean
gst_base_sink_deactivate (GstBaseSink * basesink, GstPad * pad)
{
gboolean result = FALSE;
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
/* step 1, unblock clock sync (if any) or any other blocking thing */
GST_PAD_PREROLL_LOCK (pad);
GST_OBJECT_LOCK (basesink);
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_OBJECT_UNLOCK (basesink);
/* 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 FALSE");
basesink->need_preroll = FALSE;
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PAD_PREROLL_SIGNAL (pad);
GST_PAD_PREROLL_UNLOCK (pad);
/* 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");
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_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)) {
basesink->have_newsegment = TRUE;
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
/* 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 {
basesink->have_newsegment = FALSE;
result = gst_base_sink_deactivate (basesink, pad);
basesink->pad_mode = GST_ACTIVATE_NONE;
}
}
gst_object_unref (basesink);
return result;
}
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:
{
/* we can answer time format */
GST_OBJECT_LOCK (basesink);
if ((clock = GST_ELEMENT_CLOCK (basesink))) {
GstClockTime now, base;
gint64 time;
gst_object_ref (clock);
GST_OBJECT_UNLOCK (basesink);
now = gst_clock_get_time (clock);
GST_OBJECT_LOCK (basesink);
if (GST_CLOCK_TIME_IS_VALID (basesink->segment.time))
time = basesink->segment.time;
else
time = 0;
base = GST_ELEMENT_CAST (basesink)->base_time;
base += basesink->segment.accum;
base = MIN (now, base);
*cur = (now - base) * basesink->segment.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 (basesink->segment.accum), GST_TIME_ARGS (time),
GST_TIME_ARGS (*cur));
gst_object_unref (clock);
res = TRUE;
}
GST_OBJECT_UNLOCK (basesink);
}
default:
break;
}
return res;
}
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;
gboolean eos;
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
eos = basesink->eos;
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
if (eos) {
res = gst_base_sink_peer_query (basesink, query);
} else {
gst_query_parse_position (query, &format, NULL);
GST_DEBUG_OBJECT (basesink, "current position format %d", format);
if ((res = gst_base_sink_get_position (basesink, format, &cur))) {
gst_query_set_position (query, format, cur);
} else {
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. */
basesink->offset = 0;
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
basesink->have_preroll = FALSE;
GST_DEBUG_OBJECT (basesink, "READY to PAUSED, need preroll to FALSE");
basesink->need_preroll = TRUE;
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
basesink->have_newsegment = FALSE;
ret = GST_STATE_CHANGE_ASYNC;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
/* no preroll needed */
basesink->need_preroll = FALSE;
/* if we have EOS, we should empty the queue now as there will
* be no more data received in the chain function.
* FIXME, this could block the state change function too long when
* we are pushing and syncing the buffers, better start a new
* thread to do this. */
if (basesink->eos) {
gboolean do_eos = !basesink->eos_queued;
gst_base_sink_preroll_queue_empty (basesink, basesink->sinkpad);
/* need to post EOS message here if it was not in the preroll queue we
* just emptied. */
if (do_eos) {
GST_DEBUG_OBJECT (basesink, "Now posting EOS");
gst_element_post_message (GST_ELEMENT_CAST (basesink),
gst_message_new_eos (GST_OBJECT_CAST (basesink)));
}
} else if (!basesink->have_preroll) {
/* queue a commit_state */
basesink->need_preroll = TRUE;
GST_DEBUG_OBJECT (basesink,
"PAUSED to PLAYING, !eos, !have_preroll, need preroll to TRUE");
ret = GST_STATE_CHANGE_ASYNC;
/* we know it's not waiting, no need to signal */
} else {
GST_DEBUG_OBJECT (basesink,
"PAUSED to PLAYING, !eos, have_preroll, need preroll to FALSE");
/* now let it play */
GST_PAD_PREROLL_SIGNAL (basesink->sinkpad);
}
GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
break;
default:
break;
}
{
GstStateChangeReturn bret;
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (bret == GST_STATE_CHANGE_FAILURE)
goto activate_failed;
}
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
{
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
GST_PAD_PREROLL_LOCK (basesink->sinkpad);
GST_OBJECT_LOCK (basesink);
/* unlock clock wait if any */
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_OBJECT_UNLOCK (basesink);
/* unlock any subclasses */
if (bclass->unlock)
bclass->unlock (basesink);
/* if we don't have a preroll buffer and we have not received EOS,
* we need to wait for a preroll */
GST_DEBUG_OBJECT (basesink, "have_preroll: %d, EOS: %d",
basesink->have_preroll, basesink->eos);
if (!basesink->have_preroll && !basesink->eos
&& GST_STATE_PENDING (basesink) == GST_STATE_PAUSED) {
GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED, need preroll to TRUE");
basesink->need_preroll = 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 ("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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