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gstreamer/libs/gst/base/gstbasesink.c
Wim Taymans 7612a38449 gst/: API change fix. 
Original commit message from CVS:
* gst/base/gstbasesink.c: (gst_base_sink_commit_state),
(gst_base_sink_handle_object), (gst_base_sink_query), (do_playing):
* gst/base/gstbasesrc.c: (gst_base_src_query):
* gst/elements/gstfilesink.c: (gst_file_sink_query):
* gst/elements/gsttypefindelement.c:
(gst_type_find_handle_src_query), (find_element_get_length),
(gst_type_find_element_activate):
API change fix.

* gst/gstquery.c: (gst_query_new_position),
(gst_query_set_position), (gst_query_parse_position),
(gst_query_new_duration), (gst_query_set_duration),
(gst_query_parse_duration), (gst_query_set_segment),
(gst_query_parse_segment):
* gst/gstquery.h:
Bundling query position/duration is not a good idea since duration
does not change much and we don't want to recalculate it for every
position query, so they are separated again..
Base value in segment query is not needed.

* gst/gstqueue.c: (gst_queue_handle_src_query):
* gst/gstutils.c: (gst_element_query_position),
(gst_element_query_duration), (gst_pad_query_position),
(gst_pad_query_duration):
* gst/gstutils.h:
Updates for query API change.
Added some docs here and there.
2005-10-19 15:50:10 +00:00

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/* GStreamer
* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
*
* gstbasesink.c:
*
* 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
*
* This class is for elements that do output operations.
*
* <itemizedlist>
* <listitem><para>one sinkpad</para></listitem>
* <listitem><para>handles state changes</para></listitem>
* <listitem><para>pull/push mode</para></listitem>
* <listitem><para>handles seeking/query</para></listitem>
* <listitem><para>handles preroll</para></listitem>
* <listitem><para>EOS handling</para></listitem>
* </itemizedlist>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstbasesink.h"
#include <gst/gstmarshal.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 GstStateChangeReturn do_playing (GstBaseSink * sink);
static void gst_base_sink_set_clock (GstElement * element, GstClock * clock);
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 */
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->set_clock = GST_DEBUG_FUNCPTR (gst_base_sink_set_clock);
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_clock (GstElement * element, GstClock * clock)
{
GstBaseSink *sink;
sink = GST_BASE_SINK (element);
sink->clock = clock;
}
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_PREROLL_LOCK (sink->sinkpad);
sink->preroll_queue_max_len = g_value_get_uint (value);
GST_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_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_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 (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_PREROLL_UNLOCK (pad);
if (is_buffer) {
GST_DEBUG_OBJECT (basesink, "popped buffer %p", obj);
ret = gst_base_sink_handle_buffer (basesink, GST_BUFFER (obj));
} else {
GST_DEBUG_OBJECT (basesink, "popped event %p", obj);
gst_base_sink_handle_event (basesink, GST_EVENT (obj));
ret = GST_FLOW_OK;
}
GST_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_PREROLL_SIGNAL (pad);
}
static gboolean
gst_base_sink_commit_state (GstBaseSink * basesink)
{
/* commit state and proceed to next pending state */
{
GstState current, next, pending;
GstMessage *message;
gboolean post_paused = FALSE;
gboolean post_playing = FALSE;
GST_LOCK (basesink);
current = GST_STATE (basesink);
next = GST_STATE_NEXT (basesink);
pending = GST_STATE_PENDING (basesink);
switch (pending) {
case GST_STATE_PLAYING:
do_playing (basesink);
post_playing = TRUE;
break;
case GST_STATE_PAUSED:
basesink->need_preroll = TRUE;
post_paused = TRUE;
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;
pending = GST_STATE_VOID_PENDING;
}
GST_UNLOCK (basesink);
if (post_paused) {
message = gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
current, next, GST_STATE_VOID_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_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;
GST_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 segment_start;
gint64 segment_stop;
gint64 segment_time;
GstClockTime duration;
/* 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_newsegment (event, &update, &rate, &format,
&segment_start, &segment_stop, &segment_time);
basesink->have_newsegment = TRUE;
/* any other format with 0 also gives time 0, the other values are
* invalid as time though. */
if (format != GST_FORMAT_TIME && segment_start == 0) {
GST_DEBUG_OBJECT (basesink,
"non-time newsegment with start 0, coaxing into FORMAT_TIME");
format = GST_FORMAT_TIME;
segment_stop = -1;
segment_time = -1;
}
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (basesink,
"received non time %d NEW_SEGMENT %" G_GINT64_FORMAT
" -- %" G_GINT64_FORMAT ", time %" G_GINT64_FORMAT,
format, segment_start, segment_stop, segment_time);
/* this means this sink will not be able to clip or drop samples
* and timestamps have to start from 0. */
basesink->segment_start = -1;
basesink->segment_stop = -1;
basesink->segment_time = -1;
goto done_newsegment;
}
/* check if we really have a new segment or the previous one is
* closed */
if (!update) {
/* the new segment has to be aligned with the old segment.
* We first update the accumulated time of the previous
* segment. the accumulated time is used when syncing to the
* clock. A flush event sets the accumulated time back to 0
*/
if (GST_CLOCK_TIME_IS_VALID (basesink->segment_stop)) {
duration = basesink->segment_stop - basesink->segment_start;
} else if (GST_CLOCK_TIME_IS_VALID (basesink->current_end)) {
/* else use last seen timestamp as segment stop */
duration = basesink->current_end - basesink->segment_start;
} else {
duration = 0;
}
} else {
duration = segment_start - basesink->segment_start;
}
/* use previous rate to calculate duration */
basesink->segment_accum += gst_gdouble_to_guint64 (
(gst_guint64_to_gdouble (duration) / ABS (basesink->segment_rate)));
/* then update the current segment */
basesink->segment_rate = rate;
basesink->segment_start = segment_start;
basesink->segment_stop = segment_stop;
basesink->segment_time = segment_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));
done_newsegment:
break;
}
default:
break;
}
basesink->events_queued++;
} else {
GstBuffer *buf = GST_BUFFER (obj);
if (!basesink->have_newsegment) {
GST_ELEMENT_WARNING (basesink, STREAM, STOPPED,
("Received buffer without a new-segment. Cannot sync to clock."),
("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));
/* need to drop if the timestamp is not between segment_start and
* segment_stop. we check if the complete sample is outside of the
* range since the sink might be able to clip the sample. */
if (GST_CLOCK_TIME_IS_VALID (end) &&
GST_CLOCK_TIME_IS_VALID (basesink->segment_start)) {
if (end <= basesink->segment_start) {
GST_DEBUG_OBJECT (basesink,
"buffer end %" GST_TIME_FORMAT " <= segment start %"
GST_TIME_FORMAT ", dropping buffer", GST_TIME_ARGS (end),
GST_TIME_ARGS (basesink->segment_start));
goto dropping;
}
}
if (GST_CLOCK_TIME_IS_VALID (start) &&
GST_CLOCK_TIME_IS_VALID (basesink->segment_stop)) {
if (basesink->segment_stop <= start) {
GST_DEBUG_OBJECT (basesink,
"buffer start %" GST_TIME_FORMAT " >= segment stop %"
GST_TIME_FORMAT ", dropping buffer", GST_TIME_ARGS (start),
GST_TIME_ARGS (basesink->segment_stop));
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;
GstFlowReturn pres;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (bclass->preroll)
if ((pres =
bclass->preroll (basesink, GST_BUFFER (obj))) != 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_LOCK (pad);
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
goto flushing;
GST_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_PREROLL_WAIT (pad);
GST_DEBUG_OBJECT (basesink, "done preroll");
GST_LOCK (pad);
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
goto flushing;
GST_UNLOCK (pad);
}
GST_PREROLL_UNLOCK (pad);
return GST_FLOW_OK;
no_preroll:
{
GstFlowReturn ret;
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_PREROLL_UNLOCK (pad);
return ret;
}
dropping:
{
GstBuffer *buf;
buf = GST_BUFFER (g_queue_pop_tail (basesink->preroll_queue));
gst_buffer_unref (buf);
GST_PREROLL_UNLOCK (pad);
return GST_FLOW_OK;
}
flushing:
{
GST_UNLOCK (pad);
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PREROLL_UNLOCK (pad);
GST_DEBUG_OBJECT (basesink, "pad is flushing");
return GST_FLOW_WRONG_STATE;
}
stopping:
{
GST_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_DEBUG_OBJECT (basesink, "abort state");
gst_element_abort_state (GST_ELEMENT (basesink));
return GST_FLOW_ERROR;
}
}
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;
GST_STREAM_LOCK (pad);
/* EOS also finishes the preroll */
ret =
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
GST_STREAM_UNLOCK (pad);
break;
}
case GST_EVENT_NEWSEGMENT:
{
GstFlowReturn ret;
GST_STREAM_LOCK (pad);
ret =
gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (event));
GST_STREAM_UNLOCK (pad);
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_LOCK (basesink);
basesink->flushing = TRUE;
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_UNLOCK (basesink);
GST_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_PREROLL_UNLOCK (pad);
/* and we need to commit our state again on the next
* prerolled buffer */
GST_STREAM_LOCK (pad);
gst_element_lost_state (GST_ELEMENT (basesink));
GST_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_STREAM_LOCK (pad);
GST_LOCK (basesink);
basesink->flushing = FALSE;
GST_UNLOCK (basesink);
/* we need new segment info after the flush. */
basesink->segment_start = -1;
basesink->segment_stop = -1;
basesink->current_start = -1;
basesink->current_end = -1;
GST_DEBUG_OBJECT (basesink, "reset accum %" GST_TIME_FORMAT,
GST_TIME_ARGS (basesink->segment_accum));
basesink->segment_accum = 0;
GST_STREAM_UNLOCK (pad);
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 (basesink->clock, time);
basesink->clock_id = id;
/* release the object lock while waiting */
GST_UNLOCK (basesink);
ret = gst_clock_id_wait (id, NULL);
GST_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;
GstClockTimeDiff stream_start, stream_end;
GstBaseSinkClass *bclass;
gboolean start_valid, end_valid;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
start = end = -1;
if (bclass->get_times)
bclass->get_times (basesink, buffer, &start, &end);
start_valid = GST_CLOCK_TIME_IS_VALID (start);
end_valid = GST_CLOCK_TIME_IS_VALID (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 (!start_valid)
goto done;
/* save last times seen. */
basesink->current_start = start;
if (end_valid)
basesink->current_end = end;
else
basesink->current_end = start;
if (GST_CLOCK_TIME_IS_VALID (basesink->segment_stop)) {
/* check if not outside of the segment range, start is
* always valid here. */
if (start > basesink->segment_stop)
goto out_of_segment;
}
/* bring timestamp to stream time using last segment offset. */
if (GST_CLOCK_TIME_IS_VALID (basesink->segment_start)) {
/* check if not outside of the segment range */
if (end_valid && end < basesink->segment_start)
goto out_of_segment;
stream_start = (gint64) start - basesink->segment_start;
stream_end = (gint64) end - basesink->segment_start;
} else {
stream_start = (gint64) start;
stream_end = (gint64) end;
}
/* correct for rate */
if (basesink->segment_rate != 0.0) {
stream_start /= ABS (basesink->segment_rate);
if (end_valid)
stream_end /= ABS (basesink->segment_rate);
}
stream_start += basesink->segment_accum;
if (end_valid)
stream_end += basesink->segment_accum;
/* now do clocking */
if (basesink->clock && basesink->sync) {
GstClockTime base_time;
GST_LOCK (basesink);
base_time = GST_ELEMENT (basesink)->base_time;
GST_LOG_OBJECT (basesink,
"waiting for clock, base time %" GST_TIME_FORMAT,
GST_TIME_ARGS (base_time));
/* also save end_time of this buffer so that we can wait
* to signal EOS */
if (end_valid)
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_UNLOCK (basesink);
GST_LOG_OBJECT (basesink, "clock entry done: %d", result);
}
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_LOCK (basesink);
if (basesink->clock) {
/* 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_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_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 (basesink),
gst_message_new_eos (GST_OBJECT (basesink)));
basesink->eos_queued = FALSE;
}
GST_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_LOCK (pad);
g_warning ("Push on pad %s:%s, but it was not activated in push mode",
GST_DEBUG_PAD_NAME (pad));
GST_UNLOCK (pad);
result = GST_FLOW_UNEXPECTED;
goto done;
}
result = gst_base_sink_handle_object (basesink, pad, GST_MINI_OBJECT (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_PREROLL_LOCK (pad);
GST_LOCK (basesink);
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_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_PREROLL_SIGNAL (pad);
GST_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;
basesink->segment_start = basesink->segment_stop = 0;
/* 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_LOCK (element);
pad = basesink->sinkpad;
gst_object_ref (pad);
GST_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_query (GstElement * element, GstQuery * query)
{
gboolean res = FALSE;
GstBaseSink *basesink = GST_BASE_SINK (element);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
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_SEEKING:
res = gst_base_sink_peer_query (basesink, query);
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_CONVERT:
res = gst_base_sink_peer_query (basesink, query);
break;
case GST_QUERY_FORMATS:
res = gst_base_sink_peer_query (basesink, query);
break;
default:
break;
}
return res;
}
/* with PREROLL_LOCK */
static GstStateChangeReturn
do_playing (GstBaseSink * basesink)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
/* 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 (basesink),
gst_message_new_eos (GST_OBJECT (basesink)));
}
} else if (!basesink->have_preroll) {
/* don't need preroll, but do queue a commit_state */
basesink->need_preroll = TRUE;
GST_DEBUG_OBJECT (basesink,
"PAUSED to PLAYING, !eos, !have_preroll, need preroll to FALSE");
ret = GST_STATE_CHANGE_ASYNC;
/* we know it's not waiting, no need to signal */
} else {
/* don't need the preroll anymore */
GST_DEBUG_OBJECT (basesink,
"PAUSED to PLAYING, !eos, have_preroll, need preroll to FALSE");
/* now let it play */
GST_PREROLL_SIGNAL (basesink->sinkpad);
}
return ret;
}
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_PREROLL_LOCK (basesink->sinkpad);
basesink->have_preroll = FALSE;
GST_DEBUG_OBJECT (basesink, "READY to PAUSED, need preroll to FALSE");
basesink->need_preroll = TRUE;
GST_PREROLL_UNLOCK (basesink->sinkpad);
basesink->have_newsegment = FALSE;
basesink->segment_rate = 1.0;
basesink->segment_start = 0;
basesink->segment_stop = 0;
basesink->segment_time = 0;
basesink->segment_accum = 0;
ret = GST_STATE_CHANGE_ASYNC;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_PREROLL_LOCK (basesink->sinkpad);
ret = do_playing (basesink);
GST_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_PREROLL_LOCK (basesink->sinkpad);
GST_LOCK (basesink);
/* unlock clock wait if any */
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_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_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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