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gstreamer/libs/gst/base/gstbasesink.c
Andy Wingo c477a458d7 gst/base/gstbasesink.c (gst_base_sink_activate_pull): Fix a race condition whereby the pad's task function is entered... 
Original commit message from CVS:
2005-09-07  Andy Wingo  <wingo@pobox.com>

* gst/base/gstbasesink.c (gst_base_sink_activate_pull): Fix a race
condition whereby the pad's task function is entered before the
pad_mode variable was set.
2005-09-07 10:06:56 +00:00

1398 lines
40 KiB
C
Raw Blame History

/* 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: #GstBaseTransformc, #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
enum
{
PROP_0,
PROP_PREROLL_QUEUE_LEN
};
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_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 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));
gstelement_class->set_clock = GST_DEBUG_FUNCPTR (gst_base_sink_set_clock);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_sink_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_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;
GST_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;
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;
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 ("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 ("popped buffer %p", obj);
ret = gst_base_sink_handle_buffer (basesink, GST_BUFFER (obj));
} else {
GST_DEBUG ("popped event %p", obj);
gst_base_sink_handle_event (basesink, GST_EVENT (obj));
ret = GST_FLOW_OK;
}
GST_PREROLL_LOCK (pad);
}
GST_DEBUG ("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 ("flushing queue %p", basesink);
if (q) {
while ((obj = g_queue_pop_head (q))) {
GST_DEBUG ("popped %p", obj);
gst_mini_object_unref (obj);
}
}
/* we can't have EOS anymore now */
basesink->eos = 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);
}
/* 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;
break;
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gint64 segment_start;
gint64 segment_stop;
/* 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, &basesink->segment_rate, &format,
&segment_start, &segment_stop, &basesink->segment_base);
basesink->have_newsegment = TRUE;
if (format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (basesink,
"received non time %d NEW_SEGMENT %" G_GINT64_FORMAT
" -- %" G_GINT64_FORMAT ", base %" G_GINT64_FORMAT,
format, basesink->segment_start, basesink->segment_stop,
basesink->segment_base);
/* 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_base = -1;
goto done_newsegment;
}
/* check if we really have a new segment or the previous one is
* closed */
if (basesink->segment_start != segment_start) {
/* 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)) {
basesink->segment_accum +=
basesink->segment_stop - basesink->segment_start;
} else if (GST_CLOCK_TIME_IS_VALID (basesink->current_end)) {
/* else use last seen timestamp as segment stop */
basesink->segment_accum +=
basesink->current_end - basesink->segment_start;
} else {
basesink->segment_accum = 0;
}
}
basesink->segment_start = segment_start;
basesink->segment_stop = segment_stop;
GST_DEBUG_OBJECT (basesink,
"received DISCONT %" GST_TIME_FORMAT " -- %"
GST_TIME_FORMAT ", base %" GST_TIME_FORMAT ", accum %"
GST_TIME_FORMAT,
GST_TIME_ARGS (basesink->segment_start),
GST_TIME_ARGS (basesink->segment_stop),
GST_TIME_ARGS (basesink->segment_base),
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 ("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 ("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 ("now %d preroll, %d buffers, %d events on queue",
basesink->preroll_queued,
basesink->buffers_queued, basesink->events_queued);
if (basesink->playing_async)
goto playing_async;
/* check if we are prerolling */
if (!basesink->need_preroll)
goto no_preroll;
/* there is a buffer queued */
if (basesink->buffers_queued == 1) {
GST_DEBUG ("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 ("prerolled length %d", length);
if (length == 1) {
gint t;
basesink->have_preroll = TRUE;
/* we are prerolling */
GST_PREROLL_UNLOCK (pad);
/* have to release STREAM_LOCK as we cannot take the STATE_LOCK
* inside the STREAM_LOCK */
t = GST_STREAM_UNLOCK_FULL (pad);
GST_DEBUG ("released stream lock %d times", t);
if (t <= 0) {
GST_WARNING ("STREAM_LOCK should have been locked !!");
g_warning ("STREAM_LOCK should have been locked !!");
}
/* now we commit our state */
GST_STATE_LOCK (basesink);
GST_DEBUG_OBJECT (basesink, "commit state");
gst_element_commit_state (GST_ELEMENT (basesink));
GST_STATE_UNLOCK (basesink);
/* reacquire stream lock, pad could be flushing now */
/* FIXME in glib, if t==0, the lock is still taken... hmmm */
if (t > 0)
GST_STREAM_LOCK_FULL (pad, t);
/* and wait if needed */
GST_PREROLL_LOCK (pad);
GST_LOCK (pad);
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
goto flushing;
GST_UNLOCK (pad);
/* it is possible that the application set the state to PLAYING
* now in which case we don't need to block anymore. */
if (!basesink->need_preroll)
goto no_preroll;
length = basesink->preroll_queued;
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 ("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;
}
playing_async:
{
GstFlowReturn ret;
gint t;
basesink->have_preroll = FALSE;
basesink->playing_async = FALSE;
/* handle buffer first */
ret = gst_base_sink_preroll_queue_empty (basesink, pad);
/* unroll locks, commit state, reacquire stream lock */
GST_PREROLL_UNLOCK (pad);
t = GST_STREAM_UNLOCK_FULL (pad);
GST_DEBUG ("released stream lock %d times", t);
if (t <= 0) {
GST_WARNING ("STREAM_LOCK should have been locked !!");
g_warning ("STREAM_LOCK should have been locked !!");
}
GST_STATE_LOCK (basesink);
GST_DEBUG_OBJECT (basesink, "commit state");
gst_element_commit_state (GST_ELEMENT (basesink));
GST_STATE_UNLOCK (basesink);
if (t > 0)
GST_STREAM_LOCK_FULL (pad, t);
return ret;
}
flushing:
{
GST_UNLOCK (pad);
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PREROLL_UNLOCK (pad);
GST_DEBUG ("pad is flushing");
return GST_FLOW_WRONG_STATE;
}
preroll_failed:
{
gint t;
GST_DEBUG ("preroll failed");
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_PREROLL_UNLOCK (pad);
/* have to release STREAM_LOCK as we cannot take the STATE_LOCK
* inside the STREAM_LOCK */
t = GST_STREAM_UNLOCK_FULL (pad);
GST_DEBUG ("released stream lock %d times", t);
if (t <= 0) {
GST_WARNING ("STREAM_LOCK should have been locked !!");
g_warning ("STREAM_LOCK should have been locked !!");
}
/* now we abort our state */
GST_STATE_LOCK (basesink);
GST_DEBUG_OBJECT (basesink, "abort state");
gst_element_abort_state (GST_ELEMENT (basesink));
GST_STATE_UNLOCK (basesink);
/* reacquire stream lock, pad could be flushing now */
if (t > 0)
GST_STREAM_LOCK_FULL (pad, t);
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 ("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_PREROLL_LOCK (pad);
/* we need preroll after the flush */
basesink->need_preroll = TRUE;
/* unlock from a possible state change/preroll */
gst_base_sink_preroll_queue_flush (basesink, pad);
GST_LOCK (basesink);
if (basesink->clock_id) {
gst_clock_id_unschedule (basesink->clock_id);
}
GST_UNLOCK (basesink);
GST_PREROLL_UNLOCK (pad);
/* and we need to commit our state again on the next
* prerolled buffer */
GST_STATE_LOCK (basesink);
GST_STREAM_LOCK (pad);
gst_element_lost_state (GST_ELEMENT (basesink));
GST_STREAM_UNLOCK (pad);
GST_STATE_UNLOCK (basesink);
GST_DEBUG ("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);
/* 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 ("reset accum %" GST_TIME_FORMAT,
GST_TIME_ARGS (basesink->segment_accum));
basesink->segment_accum = 0;
GST_STREAM_UNLOCK (pad);
GST_DEBUG ("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;
}
}
/* 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 gboolean
gst_base_sink_do_sync (GstBaseSink * basesink, GstBuffer * buffer)
{
gboolean result = TRUE;
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 (start);
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;
}
stream_start += basesink->segment_accum;
if (end_valid)
stream_end += basesink->segment_accum;
/* now do clocking */
if (basesink->clock) {
GstClockReturn ret;
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));
/* save clock id so that we can unlock it if needed */
basesink->clock_id = gst_clock_new_single_shot_id (basesink->clock,
stream_start + 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;
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;
}
GST_UNLOCK (basesink);
GST_LOG_OBJECT (basesink, "clock entry done: %d", ret);
if (ret == GST_CLOCK_UNSCHEDULED)
result = FALSE;
}
done:
return result;
out_of_segment:
{
GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
return FALSE;
}
}
/* 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)) {
basesink->clock_id = gst_clock_new_single_shot_id (basesink->clock,
basesink->end_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;
}
}
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)));
}
GST_PREROLL_UNLOCK (basesink->sinkpad);
break;
default:
break;
}
GST_DEBUG ("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;
gboolean render;
render = gst_base_sink_do_sync (basesink, buf);
if (render) {
GstBaseSinkClass *bclass;
bclass = GST_BASE_SINK_GET_CLASS (basesink);
if (bclass->render)
ret = bclass->render (basesink, buf);
}
GST_DEBUG ("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 */
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 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;
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;
ret = GST_STATE_CHANGE_ASYNC;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
{
GST_PREROLL_LOCK (basesink->sinkpad);
/* 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) {
gst_base_sink_preroll_queue_empty (basesink, basesink->sinkpad);
} else if (!basesink->have_preroll) {
/* don't need preroll, but do queue a commit_state */
basesink->need_preroll = FALSE;
basesink->playing_async = TRUE;
ret = GST_STATE_CHANGE_ASYNC;
/* we know it's not waiting, no need to signal */
} else {
/* don't need the preroll anymore */
basesink->need_preroll = FALSE;
/* now let it play */
GST_PREROLL_SIGNAL (basesink->sinkpad);
}
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_SUCCESS)
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);
basesink->playing_async = FALSE;
/* 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 ("have_preroll: %d, EOS: %d", basesink->have_preroll,
basesink->eos);
if (!basesink->have_preroll && !basesink->eos) {
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 ("failed to start");
return GST_STATE_CHANGE_FAILURE;
}
activate_failed:
{
GST_DEBUG ("element failed to change states -- activation problem?");
return GST_STATE_CHANGE_FAILURE;
}
}
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