gstreamer/libs/gst/base/gstbasesink.c
Wim Taymans be66bb03b4 gst/base/gstbasesink.c: Handle EOS in preroll.
Original commit message from CVS:
* gst/base/gstbasesink.c: (gst_basesink_preroll_queue_push),
(gst_basesink_activate):
Handle EOS in preroll.
2005-05-30 15:36:09 +00:00

909 lines
24 KiB
C

/* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstbasesink.h"
#include <gst/gstmarshal.h>
GST_DEBUG_CATEGORY_STATIC (gst_basesink_debug);
#define GST_CAT_DEFAULT gst_basesink_debug
/* #define DEBUGGING */
#ifdef DEBUGGING
#define DEBUG(str,args...) g_print (str,##args)
#else
#define DEBUG(str,args...)
#endif
/* BaseSink signals and properties */
enum
{
/* FILL ME */
SIGNAL_HANDOFF,
LAST_SIGNAL
};
/* FIXME, need to figure out a better way to handle the pull mode */
#define DEFAULT_SIZE 1024
#define DEFAULT_HAS_LOOP FALSE
#define DEFAULT_HAS_CHAIN TRUE
enum
{
PROP_0,
PROP_HAS_LOOP,
PROP_HAS_CHAIN,
PROP_PREROLL_QUEUE_LEN
};
static GstElementClass *parent_class = NULL;
static void gst_basesink_base_init (gpointer g_class);
static void gst_basesink_class_init (GstBaseSinkClass * klass);
static void gst_basesink_init (GstBaseSink * trans, gpointer g_class);
static void gst_basesink_finalize (GObject * object);
GType
gst_basesink_get_type (void)
{
static GType basesink_type = 0;
if (!basesink_type) {
static const GTypeInfo basesink_info = {
sizeof (GstBaseSinkClass),
(GBaseInitFunc) gst_basesink_base_init,
NULL,
(GClassInitFunc) gst_basesink_class_init,
NULL,
NULL,
sizeof (GstBaseSink),
0,
(GInstanceInitFunc) gst_basesink_init,
};
basesink_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseSink", &basesink_info, G_TYPE_FLAG_ABSTRACT);
}
return basesink_type;
}
static void gst_basesink_set_clock (GstElement * element, GstClock * clock);
static void gst_basesink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_basesink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstCaps *gst_base_sink_get_caps (GstBaseSink * sink);
static gboolean gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps);
static GstBuffer *gst_base_sink_buffer_alloc (GstBaseSink * sink,
guint64 offset, guint size, GstCaps * caps);
static void gst_basesink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end);
static GstElementStateReturn gst_basesink_change_state (GstElement * element);
static GstFlowReturn gst_basesink_chain_unlocked (GstPad * pad,
GstBuffer * buffer);
static void gst_basesink_loop (GstPad * pad);
static GstFlowReturn gst_basesink_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_basesink_activate (GstPad * pad, GstActivateMode mode);
static gboolean gst_basesink_event (GstPad * pad, GstEvent * event);
static inline GstFlowReturn gst_basesink_handle_buffer (GstBaseSink * basesink,
GstBuffer * buf);
static void
gst_basesink_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (gst_basesink_debug, "basesink", 0,
"basesink element");
}
static void
gst_basesink_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_basesink_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_basesink_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_basesink_get_property);
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HAS_LOOP,
g_param_spec_boolean ("has-loop", "has-loop",
"Enable loop-based operation", DEFAULT_HAS_LOOP,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HAS_CHAIN,
g_param_spec_boolean ("has-chain", "has-chain",
"Enable chain-based operation", DEFAULT_HAS_CHAIN,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
/* 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));
gstelement_class->set_clock = GST_DEBUG_FUNCPTR (gst_basesink_set_clock);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_basesink_change_state);
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_basesink_get_times);
}
static GstCaps *
gst_basesink_pad_getcaps (GstPad * pad)
{
GstBaseSinkClass *bclass;
GstBaseSink *bsink;
GstCaps *caps = NULL;
bsink = GST_BASESINK (GST_PAD_PARENT (pad));
bclass = GST_BASESINK_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));
}
}
return caps;
}
static gboolean
gst_basesink_pad_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseSinkClass *bclass;
GstBaseSink *bsink;
gboolean res = FALSE;
bsink = GST_BASESINK (GST_PAD_PARENT (pad));
bclass = GST_BASESINK_GET_CLASS (bsink);
if (bclass->set_caps)
res = bclass->set_caps (bsink, caps);
return res;
}
static GstBuffer *
gst_basesink_pad_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps)
{
GstBaseSinkClass *bclass;
GstBaseSink *bsink;
GstBuffer *buffer = NULL;
bsink = GST_BASESINK (GST_PAD_PARENT (pad));
bclass = GST_BASESINK_GET_CLASS (bsink);
if (bclass->buffer_alloc)
buffer = bclass->buffer_alloc (bsink, offset, size, caps);
return buffer;
}
static void
gst_basesink_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_basesink_pad_getcaps));
gst_pad_set_setcaps_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_basesink_pad_setcaps));
gst_pad_set_bufferalloc_function (basesink->sinkpad,
GST_DEBUG_FUNCPTR (gst_basesink_pad_buffer_alloc));
gst_element_add_pad (GST_ELEMENT (basesink), basesink->sinkpad);
basesink->pad_mode = GST_ACTIVATE_NONE;
GST_RPAD_TASK (basesink->sinkpad) = NULL;
basesink->preroll_queue = g_queue_new ();
GST_FLAG_SET (basesink, GST_ELEMENT_IS_SINK);
}
static void
gst_basesink_finalize (GObject * object)
{
GstBaseSink *basesink;
basesink = GST_BASESINK (object);
g_queue_free (basesink->preroll_queue);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_basesink_set_pad_functions (GstBaseSink * this, GstPad * pad)
{
gst_pad_set_activate_function (pad,
GST_DEBUG_FUNCPTR (gst_basesink_activate));
gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_basesink_event));
if (this->has_chain)
gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_basesink_chain));
else
gst_pad_set_chain_function (pad, NULL);
if (this->has_loop)
gst_pad_set_loop_function (pad, GST_DEBUG_FUNCPTR (gst_basesink_loop));
else
gst_pad_set_loop_function (pad, NULL);
}
static void
gst_basesink_set_all_pad_functions (GstBaseSink * this)
{
GList *l;
for (l = GST_ELEMENT_PADS (this); l; l = l->next)
gst_basesink_set_pad_functions (this, (GstPad *) l->data);
}
static void
gst_basesink_set_clock (GstElement * element, GstClock * clock)
{
GstBaseSink *sink;
sink = GST_BASESINK (element);
sink->clock = clock;
}
static void
gst_basesink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseSink *sink;
sink = GST_BASESINK (object);
GST_LOCK (sink);
switch (prop_id) {
case PROP_HAS_LOOP:
sink->has_loop = g_value_get_boolean (value);
gst_basesink_set_all_pad_functions (sink);
break;
case PROP_HAS_CHAIN:
sink->has_chain = g_value_get_boolean (value);
gst_basesink_set_all_pad_functions (sink);
break;
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_UNLOCK (sink);
}
static void
gst_basesink_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBaseSink *sink;
sink = GST_BASESINK (object);
GST_LOCK (sink);
switch (prop_id) {
case PROP_HAS_LOOP:
g_value_set_boolean (value, sink->has_loop);
break;
case PROP_HAS_CHAIN:
g_value_set_boolean (value, sink->has_chain);
break;
case PROP_PREROLL_QUEUE_LEN:
g_value_set_uint (value, sink->preroll_queue_max_len);
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 GstBuffer *
gst_base_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
GstCaps * caps)
{
return NULL;
}
/* with PREROLL_LOCK */
static void
gst_basesink_preroll_queue_push (GstBaseSink * basesink, GstPad * pad,
GstBuffer * buffer)
{
/* if we don't have a buffer we just start blocking */
if (buffer == NULL)
goto block;
/* first buffer */
if (basesink->preroll_queue->length == 0) {
GstBaseSinkClass *bclass = GST_BASESINK_GET_CLASS (basesink);
GST_DEBUG ("preroll buffer with TS: %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
if (bclass->preroll)
bclass->preroll (basesink, buffer);
}
if (basesink->preroll_queue->length < basesink->preroll_queue_max_len) {
DEBUG ("push %p %p\n", basesink, buffer);
g_queue_push_tail (basesink->preroll_queue, buffer);
return;
}
block:
/* block until the state changes, or we get a flush, or something */
DEBUG ("block %p %p\n", basesink, buffer);
GST_DEBUG ("element %s waiting to finish preroll",
GST_ELEMENT_NAME (basesink));
basesink->need_preroll = FALSE;
basesink->have_preroll = TRUE;
GST_PREROLL_WAIT (pad);
GST_DEBUG ("done preroll");
basesink->have_preroll = FALSE;
}
/* with PREROLL_LOCK */
static GstFlowReturn
gst_basesink_preroll_queue_empty (GstBaseSink * basesink, GstPad * pad)
{
GstBuffer *buf;
GQueue *q = basesink->preroll_queue;
GstFlowReturn ret;
ret = GST_FLOW_OK;
if (q) {
DEBUG ("empty queue\n");
while ((buf = g_queue_pop_head (q))) {
DEBUG ("pop %p\n", buf);
ret = gst_basesink_handle_buffer (basesink, buf);
}
DEBUG ("queue len %p %d\n", basesink, q->length);
}
return ret;
}
/* with PREROLL_LOCK */
static void
gst_basesink_preroll_queue_flush (GstBaseSink * basesink)
{
GstBuffer *buf;
GQueue *q = basesink->preroll_queue;
DEBUG ("flush %p\n", basesink);
if (q) {
while ((buf = g_queue_pop_head (q))) {
DEBUG ("pop %p\n", buf);
gst_buffer_unref (buf);
}
}
}
typedef enum
{
PREROLL_QUEUEING,
PREROLL_PLAYING,
PREROLL_FLUSHING,
PREROLL_ERROR
} PrerollReturn;
/* with STREAM_LOCK */
PrerollReturn
gst_basesink_finish_preroll (GstBaseSink * basesink, GstPad * pad,
GstBuffer * buffer)
{
gboolean flushing;
DEBUG ("finish preroll %p <\n", basesink);
/* lock order is important */
GST_STATE_LOCK (basesink);
GST_PREROLL_LOCK (pad);
DEBUG ("finish preroll %p >\n", basesink);
if (!basesink->need_preroll)
goto no_preroll;
gst_element_commit_state (GST_ELEMENT (basesink));
GST_STATE_UNLOCK (basesink);
gst_basesink_preroll_queue_push (basesink, pad, buffer);
GST_LOCK (pad);
flushing = GST_RPAD_IS_FLUSHING (pad);
GST_UNLOCK (pad);
if (flushing)
goto flushing;
if (basesink->need_preroll)
goto still_queueing;
GST_DEBUG ("done preroll");
gst_basesink_preroll_queue_empty (basesink, pad);
GST_PREROLL_UNLOCK (pad);
return PREROLL_PLAYING;
no_preroll:
{
/* maybe it was another sink that blocked in preroll, need to check for
buffers to drain */
if (basesink->preroll_queue->length)
gst_basesink_preroll_queue_empty (basesink, pad);
GST_PREROLL_UNLOCK (pad);
GST_STATE_UNLOCK (basesink);
return PREROLL_PLAYING;
}
flushing:
{
GST_DEBUG ("pad is flushing");
GST_PREROLL_UNLOCK (pad);
return PREROLL_FLUSHING;
}
still_queueing:
{
GST_PREROLL_UNLOCK (pad);
return PREROLL_QUEUEING;
}
}
static gboolean
gst_basesink_event (GstPad * pad, GstEvent * event)
{
GstBaseSink *basesink;
gboolean result = TRUE;
GstBaseSinkClass *bclass;
basesink = GST_BASESINK (GST_OBJECT_PARENT (pad));
bclass = GST_BASESINK_GET_CLASS (basesink);
DEBUG ("event %p\n", basesink);
if (bclass->event)
bclass->event (basesink, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
{
gboolean need_eos;
GST_STREAM_LOCK (pad);
/* EOS also finishes the preroll */
gst_basesink_finish_preroll (basesink, pad, NULL);
GST_LOCK (basesink);
need_eos = basesink->eos = TRUE;
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)) {
basesink->clock_id = gst_clock_new_single_shot_id (basesink->clock,
basesink->end_time + GST_ELEMENT (basesink)->base_time);
GST_UNLOCK (basesink);
gst_clock_id_wait (basesink->clock_id, NULL);
GST_LOCK (basesink);
if (basesink->clock_id) {
gst_clock_id_unref (basesink->clock_id);
basesink->clock_id = NULL;
}
basesink->end_time = GST_CLOCK_TIME_NONE;
need_eos = basesink->eos;
}
GST_UNLOCK (basesink);
/* if we are still EOS, we can post the EOS message */
if (need_eos) {
/* ok, now we can post the message */
gst_element_post_message (GST_ELEMENT (basesink),
gst_message_new_eos (GST_OBJECT (basesink)));
}
}
GST_STREAM_UNLOCK (pad);
break;
}
case GST_EVENT_DISCONTINUOUS:
GST_STREAM_LOCK (pad);
if (basesink->clock) {
//gint64 value = GST_EVENT_DISCONT_OFFSET (event, 0).value;
}
GST_STREAM_UNLOCK (pad);
break;
case GST_EVENT_FLUSH:
/* make sure we are not blocked on the clock also clear any pending
* eos state. */
if (!GST_EVENT_FLUSH_DONE (event)) {
GST_LOCK (basesink);
basesink->eos = FALSE;
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_UNLOCK (basesink);
/* unlock from a possible state change/preroll */
GST_PREROLL_LOCK (pad);
basesink->need_preroll = TRUE;
gst_basesink_preroll_queue_flush (basesink);
GST_PREROLL_SIGNAL (pad);
GST_PREROLL_UNLOCK (pad);
}
/* now we are completely unblocked and the _chain method
* will return */
break;
default:
result = gst_pad_event_default (pad, event);
break;
}
return result;
}
/* default implementation to calculate the start and end
* timestamps on a buffer, subclasses cna override
*/
static void
gst_basesink_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)) {
duration = GST_BUFFER_DURATION (buffer);
if (GST_CLOCK_TIME_IS_VALID (duration)) {
*end = timestamp + duration;
}
*start = timestamp;
}
}
/* 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 void
gst_basesink_do_sync (GstBaseSink * basesink, GstBuffer * buffer)
{
if (basesink->clock) {
GstClockReturn ret;
GstClockTime start, end;
GstBaseSinkClass *bclass;
bclass = GST_BASESINK_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 (GST_CLOCK_TIME_IS_VALID (start)) {
/* save clock id so that we can unlock it if needed */
GST_LOCK (basesink);
basesink->clock_id = gst_clock_new_single_shot_id (basesink->clock,
start + GST_ELEMENT (basesink)->base_time);
basesink->end_time = end;
GST_UNLOCK (basesink);
ret = gst_clock_id_wait (basesink->clock_id, NULL);
GST_LOCK (basesink);
if (basesink->clock_id) {
gst_clock_id_unref (basesink->clock_id);
basesink->clock_id = NULL;
}
/* FIXME, don't mess with end_time here */
basesink->end_time = GST_CLOCK_TIME_NONE;
GST_UNLOCK (basesink);
GST_LOG_OBJECT (basesink, "clock entry done: %d", ret);
}
}
}
/* handle a buffer
*
* 1) first sync on the buffer
* 2) render the buffer
* 3) unref the buffer
*/
static inline GstFlowReturn
gst_basesink_handle_buffer (GstBaseSink * basesink, GstBuffer * buf)
{
GstBaseSinkClass *bclass;
GstFlowReturn ret;
gst_basesink_do_sync (basesink, buf);
bclass = GST_BASESINK_GET_CLASS (basesink);
if (bclass->render)
ret = bclass->render (basesink, buf);
else
ret = GST_FLOW_OK;
DEBUG ("unref %p %p\n", basesink, buf);
gst_buffer_unref (buf);
return ret;
}
static GstFlowReturn
gst_basesink_chain_unlocked (GstPad * pad, GstBuffer * buf)
{
GstBaseSink *basesink;
PrerollReturn result;
basesink = GST_BASESINK (GST_OBJECT_PARENT (pad));
DEBUG ("chain_unlocked %p\n", basesink);
result = gst_basesink_finish_preroll (basesink, pad, buf);
DEBUG ("chain_unlocked %p after, result %d\n", basesink, result);
switch (result) {
case PREROLL_QUEUEING:
return GST_FLOW_OK;
case PREROLL_PLAYING:
return gst_basesink_handle_buffer (basesink, buf);
case PREROLL_FLUSHING:
gst_buffer_unref (buf);
return GST_FLOW_UNEXPECTED;
default:
g_assert_not_reached ();
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_basesink_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn result;
g_assert (GST_BASESINK (GST_OBJECT_PARENT (pad))->pad_mode ==
GST_ACTIVATE_PUSH);
result = gst_basesink_chain_unlocked (pad, buf);
return result;
}
/* FIXME, not all sinks can operate in pull mode
*/
static void
gst_basesink_loop (GstPad * pad)
{
GstBaseSink *basesink;
GstBuffer *buf = NULL;
GstFlowReturn result;
basesink = GST_BASESINK (GST_OBJECT_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_basesink_chain_unlocked (pad, buf);
if (result != GST_FLOW_OK)
goto paused;
/* default */
return;
paused:
gst_pad_pause_task (pad);
return;
}
static gboolean
gst_basesink_activate (GstPad * pad, GstActivateMode mode)
{
gboolean result = FALSE;
GstBaseSink *basesink;
GstBaseSinkClass *bclass;
basesink = GST_BASESINK (GST_OBJECT_PARENT (pad));
bclass = GST_BASESINK_GET_CLASS (basesink);
switch (mode) {
case GST_ACTIVATE_PUSH:
g_return_val_if_fail (basesink->has_chain, FALSE);
result = TRUE;
break;
case GST_ACTIVATE_PULL:
/* if we have a scheduler we can start the task */
g_return_val_if_fail (basesink->has_loop, FALSE);
gst_pad_peer_set_active (pad, mode);
result =
gst_pad_start_task (pad, (GstTaskFunction) gst_basesink_loop, pad);
break;
case GST_ACTIVATE_NONE:
/* step 1, unblock clock sync (if any) or any other blocking thing */
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);
/* unlock preroll */
GST_PREROLL_LOCK (pad);
GST_PREROLL_SIGNAL (pad);
GST_PREROLL_UNLOCK (pad);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
break;
}
basesink->pad_mode = mode;
return result;
}
static GstElementStateReturn
gst_basesink_change_state (GstElement * element)
{
GstElementStateReturn ret = GST_STATE_SUCCESS;
GstBaseSink *basesink = GST_BASESINK (element);
GstElementState transition = GST_STATE_TRANSITION (element);
DEBUG ("state change > %p %x\n", basesink, transition);
switch (transition) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_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->need_preroll = TRUE;
basesink->have_preroll = FALSE;
GST_PREROLL_UNLOCK (basesink->sinkpad);
ret = GST_STATE_ASYNC;
break;
case GST_STATE_PAUSED_TO_PLAYING:
GST_PREROLL_LOCK (basesink->sinkpad);
if (basesink->have_preroll) {
/* now let it play */
GST_PREROLL_SIGNAL (basesink->sinkpad);
} else {
/* FIXME. We do not have a preroll and we don't need it anymore
* now, this is a case we want to avoid. One way would be to make
* a 'lost state' function that makes get_state return PAUSED with
* ASYNC to indicate that we are prerolling again. */
basesink->need_preroll = FALSE;
}
GST_PREROLL_UNLOCK (basesink->sinkpad);
break;
default:
break;
}
GST_ELEMENT_CLASS (parent_class)->change_state (element);
switch (transition) {
case GST_STATE_PLAYING_TO_PAUSED:
{
gboolean eos;
/* unlock clock wait if any */
GST_LOCK (basesink);
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
eos = basesink->eos;
GST_UNLOCK (basesink);
GST_PREROLL_LOCK (basesink->sinkpad);
/* if we don't have a preroll buffer and we have not received EOS,
* we need to wait for a preroll */
if (!basesink->have_preroll && !eos) {
basesink->need_preroll = TRUE;
ret = GST_STATE_ASYNC;
}
GST_PREROLL_UNLOCK (basesink->sinkpad);
break;
}
case GST_STATE_PAUSED_TO_READY:
/* flush out the data thread if it's locked in finish_preroll */
GST_PREROLL_LOCK (basesink->sinkpad);
gst_basesink_preroll_queue_flush (basesink);
if (basesink->have_preroll)
GST_PREROLL_SIGNAL (basesink->sinkpad);
basesink->need_preroll = FALSE;
basesink->have_preroll = FALSE;
GST_PREROLL_UNLOCK (basesink->sinkpad);
/* clear EOS state */
basesink->eos = FALSE;
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
DEBUG ("state change < %p %x\n", basesink, transition);
return ret;
}