gstreamer/gst/encoding/gststreamsplitter.c

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/* GStreamer Stream Splitter
* Copyright (C) 2010 Edward Hervey <edward.hervey@collabora.co.uk>
* (C) 2009 Nokia Corporation
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/video/video.h>
#include "gststreamsplitter.h"
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u", GST_PAD_SRC, GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_stream_splitter_debug);
#define GST_CAT_DEFAULT gst_stream_splitter_debug
G_DEFINE_TYPE (GstStreamSplitter, gst_stream_splitter, GST_TYPE_ELEMENT);
#define STREAMS_LOCK(obj) (g_mutex_lock(&obj->lock))
#define STREAMS_UNLOCK(obj) (g_mutex_unlock(&obj->lock))
static void gst_stream_splitter_dispose (GObject * object);
static void gst_stream_splitter_finalize (GObject * object);
static gboolean gst_stream_splitter_sink_setcaps (GstPad * pad, GstCaps * caps);
static GstPad *gst_stream_splitter_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
static void gst_stream_splitter_release_pad (GstElement * element,
GstPad * pad);
static void
gst_stream_splitter_class_init (GstStreamSplitterClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
gobject_klass->dispose = gst_stream_splitter_dispose;
gobject_klass->finalize = gst_stream_splitter_finalize;
GST_DEBUG_CATEGORY_INIT (gst_stream_splitter_debug, "streamsplitter", 0,
"Stream Splitter");
gst_element_class_add_static_pad_template (gstelement_klass, &src_template);
gst_element_class_add_static_pad_template (gstelement_klass, &sink_template);
gstelement_klass->request_new_pad =
GST_DEBUG_FUNCPTR (gst_stream_splitter_request_new_pad);
gstelement_klass->release_pad =
GST_DEBUG_FUNCPTR (gst_stream_splitter_release_pad);
gst_element_class_set_static_metadata (gstelement_klass,
"streamsplitter", "Generic",
"Splits streams based on their media type",
"Edward Hervey <edward.hervey@collabora.co.uk>");
}
static void
gst_stream_splitter_dispose (GObject * object)
{
GstStreamSplitter *stream_splitter = (GstStreamSplitter *) object;
g_list_foreach (stream_splitter->pending_events, (GFunc) gst_event_unref,
NULL);
g_list_free (stream_splitter->pending_events);
stream_splitter->pending_events = NULL;
G_OBJECT_CLASS (gst_stream_splitter_parent_class)->dispose (object);
}
static void
gst_stream_splitter_finalize (GObject * object)
{
GstStreamSplitter *stream_splitter = (GstStreamSplitter *) object;
g_mutex_clear (&stream_splitter->lock);
G_OBJECT_CLASS (gst_stream_splitter_parent_class)->finalize (object);
}
static void
gst_stream_splitter_push_pending_events (GstStreamSplitter * splitter,
GstPad * srcpad)
{
GList *tmp;
GST_DEBUG_OBJECT (srcpad, "Pushing out pending events");
for (tmp = splitter->pending_events; tmp; tmp = tmp->next) {
GstEvent *event = (GstEvent *) tmp->data;
gst_pad_push_event (srcpad, event);
}
g_list_free (splitter->pending_events);
splitter->pending_events = NULL;
}
static GstFlowReturn
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gst_stream_splitter_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
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GstStreamSplitter *stream_splitter = (GstStreamSplitter *) parent;
GstFlowReturn res;
GstPad *srcpad = NULL;
STREAMS_LOCK (stream_splitter);
if (stream_splitter->current)
srcpad = gst_object_ref (stream_splitter->current);
STREAMS_UNLOCK (stream_splitter);
if (G_UNLIKELY (srcpad == NULL))
goto nopad;
if (G_UNLIKELY (stream_splitter->pending_events))
gst_stream_splitter_push_pending_events (stream_splitter, srcpad);
/* Forward to currently activated stream */
res = gst_pad_push (srcpad, buf);
gst_object_unref (srcpad);
return res;
nopad:
GST_WARNING_OBJECT (stream_splitter, "No output pad was configured");
return GST_FLOW_ERROR;
}
static GList *
_flush_events (GstPad * pad, GList * events)
{
GList *tmp;
for (tmp = events; tmp; tmp = tmp->next) {
if (GST_EVENT_TYPE (tmp->data) != GST_EVENT_EOS &&
GST_EVENT_TYPE (tmp->data) != GST_EVENT_SEGMENT &&
GST_EVENT_IS_STICKY (tmp->data) && pad != NULL) {
gst_pad_store_sticky_event (pad, GST_EVENT_CAST (tmp->data));
}
gst_event_unref (tmp->data);
}
g_list_free (events);
return NULL;
}
static gboolean
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gst_stream_splitter_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
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GstStreamSplitter *stream_splitter = (GstStreamSplitter *) parent;
gboolean res = TRUE;
gboolean toall = FALSE;
gboolean store = FALSE;
/* FLUSH_START/STOP : forward to all
* INBAND events : store to send in chain function to selected chain
* OUT_OF_BAND events : send to all
*/
GST_DEBUG_OBJECT (stream_splitter, "Got event %s",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_STREAM_START:
toall = TRUE;
break;
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
res = gst_stream_splitter_sink_setcaps (pad, caps);
store = TRUE;
break;
}
case GST_EVENT_FLUSH_STOP:
toall = TRUE;
STREAMS_LOCK (stream_splitter);
stream_splitter->pending_events = _flush_events (stream_splitter->current,
stream_splitter->pending_events);
STREAMS_UNLOCK (stream_splitter);
break;
case GST_EVENT_FLUSH_START:
toall = TRUE;
break;
case GST_EVENT_EOS:
if (G_UNLIKELY (stream_splitter->pending_events)) {
GstPad *srcpad = NULL;
STREAMS_LOCK (stream_splitter);
if (stream_splitter->current)
srcpad = gst_object_ref (stream_splitter->current);
STREAMS_UNLOCK (stream_splitter);
if (srcpad) {
gst_stream_splitter_push_pending_events (stream_splitter, srcpad);
gst_object_unref (srcpad);
}
}
toall = TRUE;
break;
default:
if (GST_EVENT_TYPE (event) & GST_EVENT_TYPE_SERIALIZED)
store = TRUE;
}
if (store) {
stream_splitter->pending_events =
g_list_append (stream_splitter->pending_events, event);
} else if (toall) {
GList *tmp;
guint32 cookie;
/* Send to all pads */
STREAMS_LOCK (stream_splitter);
resync:
if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
STREAMS_UNLOCK (stream_splitter);
/* No source pads */
gst_event_unref (event);
res = FALSE;
goto beach;
}
tmp = stream_splitter->srcpads;
cookie = stream_splitter->cookie;
while (tmp) {
GstPad *srcpad = (GstPad *) tmp->data;
STREAMS_UNLOCK (stream_splitter);
gst_event_ref (event);
res = gst_pad_push_event (srcpad, event);
STREAMS_LOCK (stream_splitter);
if (G_UNLIKELY (cookie != stream_splitter->cookie))
goto resync;
tmp = tmp->next;
}
STREAMS_UNLOCK (stream_splitter);
gst_event_unref (event);
} else {
GstPad *pad;
/* Only send to current pad */
STREAMS_LOCK (stream_splitter);
pad = stream_splitter->current;
STREAMS_UNLOCK (stream_splitter);
if (pad)
res = gst_pad_push_event (pad, event);
else {
gst_event_unref (event);
res = FALSE;
}
}
beach:
return res;
}
static GstCaps *
gst_stream_splitter_sink_getcaps (GstPad * pad, GstCaps * filter)
{
GstStreamSplitter *stream_splitter =
(GstStreamSplitter *) GST_PAD_PARENT (pad);
guint32 cookie;
GList *tmp;
GstCaps *res = NULL;
/* Return the combination of all downstream caps */
STREAMS_LOCK (stream_splitter);
resync:
if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
res = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
goto beach;
}
res = NULL;
cookie = stream_splitter->cookie;
tmp = stream_splitter->srcpads;
while (tmp) {
GstPad *srcpad = (GstPad *) tmp->data;
/* Ensure srcpad doesn't get destroyed while we query peer */
gst_object_ref (srcpad);
STREAMS_UNLOCK (stream_splitter);
if (res) {
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GstCaps *peercaps = gst_pad_peer_query_caps (srcpad, filter);
if (peercaps)
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res = gst_caps_merge (res, peercaps);
} else {
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res = gst_pad_peer_query_caps (srcpad, filter);
}
STREAMS_LOCK (stream_splitter);
gst_object_unref (srcpad);
if (G_UNLIKELY (cookie != stream_splitter->cookie)) {
if (res)
gst_caps_unref (res);
goto resync;
}
tmp = tmp->next;
}
beach:
STREAMS_UNLOCK (stream_splitter);
return res;
}
static gboolean
gst_stream_splitter_sink_acceptcaps (GstPad * pad, GstCaps * caps)
{
GstStreamSplitter *stream_splitter =
(GstStreamSplitter *) GST_PAD_PARENT (pad);
guint32 cookie;
GList *tmp;
gboolean res = FALSE;
/* check if one of the downstream elements accepts the caps */
STREAMS_LOCK (stream_splitter);
resync:
res = FALSE;
if (G_UNLIKELY (stream_splitter->srcpads == NULL))
goto beach;
cookie = stream_splitter->cookie;
tmp = stream_splitter->srcpads;
while (tmp) {
GstPad *srcpad = (GstPad *) tmp->data;
/* Ensure srcpad doesn't get destroyed while we query peer */
gst_object_ref (srcpad);
STREAMS_UNLOCK (stream_splitter);
res = gst_pad_peer_query_accept_caps (srcpad, caps);
STREAMS_LOCK (stream_splitter);
gst_object_unref (srcpad);
if (G_UNLIKELY (cookie != stream_splitter->cookie))
goto resync;
if (res)
break;
tmp = tmp->next;
}
beach:
STREAMS_UNLOCK (stream_splitter);
return res;
}
static gboolean
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gst_stream_splitter_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_stream_splitter_sink_getcaps (pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
case GST_QUERY_ACCEPT_CAPS:
{
GstCaps *caps;
gboolean result;
gst_query_parse_accept_caps (query, &caps);
result = gst_stream_splitter_sink_acceptcaps (pad, caps);
gst_query_set_accept_caps_result (query, result);
res = TRUE;
break;
}
default:
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res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static gboolean
gst_stream_splitter_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstPad *prev = NULL;
GstStreamSplitter *stream_splitter =
(GstStreamSplitter *) GST_PAD_PARENT (pad);
guint32 cookie;
GList *tmp;
gboolean res;
GST_DEBUG_OBJECT (stream_splitter, "caps %" GST_PTR_FORMAT, caps);
/* Try on all pads, choose the one that succeeds as the current stream */
STREAMS_LOCK (stream_splitter);
resync:
if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
res = FALSE;
goto beach;
}
res = FALSE;
prev =
stream_splitter->
current ? gst_object_ref (stream_splitter->current) : NULL;
tmp = stream_splitter->srcpads;
cookie = stream_splitter->cookie;
while (tmp) {
GstPad *srcpad = (GstPad *) tmp->data;
GstCaps *peercaps;
// GST_ERROR_OBJECT (srcpad, "Checking");
STREAMS_UNLOCK (stream_splitter);
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peercaps = gst_pad_peer_query_caps (srcpad, NULL);
if (peercaps) {
res = gst_caps_can_intersect (caps, peercaps);
gst_caps_unref (peercaps);
}
STREAMS_LOCK (stream_splitter);
if (G_UNLIKELY (cookie != stream_splitter->cookie))
goto resync;
if (res) {
GST_DEBUG_OBJECT (srcpad, "Setting caps on this pad was successful");
stream_splitter->current = srcpad;
if (prev && prev != srcpad) {
/* When switching branches, we need to ensure that the branch it was
* pushing to before is drainned and the encoder pushes all its internal
* data, we do it by first letting downstream streamcombiner that we are
* working on it, and then send an EOS to ensure all the data is
* processed and cleanup the encoder with a flush start/flush stop
* dance. Those events are discarded in the stream combiner */
/* FIXME We should theoretically be able to use a DRAIN query here
* instead but the encoders do not react properly to them */
gst_pad_push_event (prev,
gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
gst_structure_new_empty ("start-draining-encoder")));
gst_pad_push_event (prev, gst_event_new_eos ());
gst_pad_push_event (prev, gst_event_new_flush_start ());
gst_pad_push_event (prev, gst_event_new_flush_stop (FALSE));
}
goto beach;
}
tmp = tmp->next;
}
beach:
gst_clear_object (&prev);
STREAMS_UNLOCK (stream_splitter);
return res;
}
static gboolean
gst_stream_splitter_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstStreamSplitter *stream_splitter = (GstStreamSplitter *) parent;
if (gst_video_event_is_force_key_unit (event)) {
guint32 seqnum = gst_event_get_seqnum (event);
STREAMS_LOCK (stream_splitter);
if (seqnum == stream_splitter->keyunit_seqnum) {
STREAMS_UNLOCK (stream_splitter);
GST_TRACE_OBJECT (pad,
"Drop duplicated force-key-unit event %" G_GUINT32_FORMAT, seqnum);
gst_event_unref (event);
return TRUE;
}
stream_splitter->keyunit_seqnum = seqnum;
STREAMS_UNLOCK (stream_splitter);
}
return gst_pad_event_default (pad, parent, event);
}
static void
gst_stream_splitter_init (GstStreamSplitter * stream_splitter)
{
stream_splitter->sinkpad =
gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (stream_splitter->sinkpad,
gst_stream_splitter_chain);
gst_pad_set_event_function (stream_splitter->sinkpad,
gst_stream_splitter_sink_event);
gst_pad_set_query_function (stream_splitter->sinkpad,
gst_stream_splitter_sink_query);
gst_element_add_pad (GST_ELEMENT (stream_splitter), stream_splitter->sinkpad);
g_mutex_init (&stream_splitter->lock);
}
static GstPad *
gst_stream_splitter_request_new_pad (GstElement * element,
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GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
{
GstStreamSplitter *stream_splitter = (GstStreamSplitter *) element;
GstPad *srcpad;
srcpad = gst_pad_new_from_static_template (&src_template, name);
STREAMS_LOCK (stream_splitter);
stream_splitter->srcpads = g_list_append (stream_splitter->srcpads, srcpad);
gst_pad_set_active (srcpad, TRUE);
gst_element_add_pad (element, srcpad);
stream_splitter->cookie++;
gst_pad_set_event_function (srcpad, gst_stream_splitter_src_event);
STREAMS_UNLOCK (stream_splitter);
return srcpad;
}
static void
gst_stream_splitter_release_pad (GstElement * element, GstPad * pad)
{
GstStreamSplitter *stream_splitter = (GstStreamSplitter *) element;
GList *tmp;
STREAMS_LOCK (stream_splitter);
tmp = g_list_find (stream_splitter->srcpads, pad);
if (tmp) {
GstPad *pad = (GstPad *) tmp->data;
stream_splitter->srcpads =
g_list_delete_link (stream_splitter->srcpads, tmp);
stream_splitter->cookie++;
if (pad == stream_splitter->current) {
/* Deactivate current flow */
GST_DEBUG_OBJECT (element, "Removed pad was the current one");
stream_splitter->current = NULL;
}
gst_element_remove_pad (element, pad);
}
STREAMS_UNLOCK (stream_splitter);
return;
}