gstreamer/gst/encoding/gstsmartencoder.c

843 lines
26 KiB
C

/* GStreamer Smart Video Encoder element
* Copyright (C) <2010> Edward Hervey <bilboed@gmail.com>
* Copyright (C) <2020> Thibault Saunier <tsaunier@igalia.com>
*
* 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 <string.h>
#include "gstsmartencoder.h"
GST_DEBUG_CATEGORY_STATIC (smart_encoder_debug);
#define GST_CAT_DEFAULT smart_encoder_debug
/* FIXME : Update this with new caps */
/* WARNING : We can only allow formats with closed-GOP */
#define ALLOWED_CAPS "video/x-h263;video/x-intel-h263;"\
"video/x-vp8;"\
"video/x-vp9;"\
"video/x-h264;"\
"video/mpeg,mpegversion=(int)1,systemstream=(boolean)false;"\
"video/mpeg,mpegversion=(int)2,systemstream=(boolean)false;"
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ALLOWED_CAPS)
);
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ALLOWED_CAPS)
);
G_DEFINE_TYPE (GstSmartEncoder, gst_smart_encoder, GST_TYPE_BIN);
static void
smart_encoder_reset (GstSmartEncoder * self)
{
gst_segment_init (&self->internal_segment, GST_FORMAT_UNDEFINED);
gst_segment_init (&self->input_segment, GST_FORMAT_UNDEFINED);
gst_segment_init (&self->output_segment, GST_FORMAT_UNDEFINED);
if (self->decoder) {
/* Clean up/remove internal encoding elements */
gst_element_set_state (self->encoder, GST_STATE_NULL);
gst_element_set_state (self->decoder, GST_STATE_NULL);
gst_clear_object (&self->internal_srcpad);
gst_element_remove_pad (GST_ELEMENT (self), self->internal_sinkpad);
gst_bin_remove (GST_BIN (self), gst_object_ref (self->encoder));
gst_bin_remove (GST_BIN (self), self->decoder);
self->decoder = NULL;
self->internal_sinkpad = NULL;
}
gst_clear_event (&self->segment_event);
}
static void
translate_timestamp_from_internal_to_src (GstSmartEncoder * self,
GstClockTime * ts)
{
GstClockTime running_time;
if (gst_segment_to_running_time_full (&self->internal_segment,
GST_FORMAT_TIME, *ts, &running_time) > 0)
*ts = running_time + self->output_segment.start;
else /* Negative timestamp */
*ts = self->output_segment.start - running_time;
}
static GstFlowReturn
gst_smart_encoder_finish_buffer (GstSmartEncoder * self, GstBuffer * buf)
{
translate_timestamp_from_internal_to_src (self, &GST_BUFFER_PTS (buf));
translate_timestamp_from_internal_to_src (self, &GST_BUFFER_DTS (buf));
GST_BUFFER_DTS (buf) = GST_BUFFER_DTS (buf);
if (self->last_dts > GST_BUFFER_DTS (buf)) {
/* Hack to always produces dts increasing DTS-s that are close to what the
* encoder produced. */
GST_BUFFER_DTS (buf) = self->last_dts + 1;
}
self->last_dts = GST_BUFFER_DTS (buf);
return gst_pad_push (self->srcpad, buf);
}
/*****************************************
* Internal encoder/decoder pipeline *
******************************************/
static gboolean
internal_event_func (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstSmartEncoder *self = GST_SMART_ENCODER (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
g_mutex_lock (&self->internal_flow_lock);
if (self->internal_flow == GST_FLOW_CUSTOM_SUCCESS)
self->internal_flow = GST_FLOW_OK;
g_cond_signal (&self->internal_flow_cond);
g_mutex_unlock (&self->internal_flow_lock);
break;
case GST_EVENT_SEGMENT:
gst_event_copy_segment (event, &self->internal_segment);
break;
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
caps = gst_caps_copy (caps);
if (self->last_caps) {
GstBuffer *codec_data = NULL, *stream_header;
GstCaps *new_caps;
GstStructure *last_struct = gst_caps_get_structure (self->last_caps, 0);
if (gst_structure_get (last_struct, "codec_data", GST_TYPE_BUFFER,
&codec_data, NULL) && codec_data) {
gst_structure_set (gst_caps_get_structure (caps, 0), "codec_data",
GST_TYPE_BUFFER, codec_data, NULL);
}
if (gst_structure_get (last_struct, "stream_header", GST_TYPE_BUFFER,
&stream_header, NULL) && stream_header) {
gst_structure_set (gst_caps_get_structure (caps, 0), "stream_header",
GST_TYPE_BUFFER, stream_header, NULL);
}
new_caps = gst_caps_intersect (self->last_caps, caps);
if (!new_caps || gst_caps_is_empty (new_caps)) {
GST_ERROR_OBJECT (parent, "New caps from reencoder %" GST_PTR_FORMAT
" are not compatible with previous caps: %" GST_PTR_FORMAT, caps,
self->last_caps);
g_mutex_lock (&self->internal_flow_lock);
self->internal_flow = GST_FLOW_NOT_NEGOTIATED;
g_cond_signal (&self->internal_flow_cond);
g_mutex_unlock (&self->internal_flow_lock);
return FALSE;
}
gst_caps_unref (caps);
caps = new_caps;
}
event = gst_event_new_caps (caps);
self->last_caps = caps;
return gst_pad_push_event (self->srcpad, event);
}
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static GstFlowReturn
internal_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
return gst_smart_encoder_finish_buffer (GST_SMART_ENCODER (parent), buf);
}
static void
decodebin_src_pad_added_cb (GstElement * decodebin, GstPad * srcpad,
GstSmartEncoder * self)
{
GstPadLinkReturn ret = gst_pad_link (srcpad, self->encoder->sinkpads->data);
if (ret != GST_PAD_LINK_OK) {
GST_ERROR_OBJECT (self, "Could not link decoder with encoder! %s",
gst_pad_link_get_name (ret));
g_mutex_lock (&self->internal_flow_lock);
self->internal_flow = GST_FLOW_NOT_LINKED;
g_mutex_unlock (&self->internal_flow_lock);
}
}
static gboolean
setup_recoder_pipeline (GstSmartEncoder * self)
{
GstPad *tmppad;
GstElement *capsfilter;
GstPadLinkReturn lret;
/* Fast path */
if (G_UNLIKELY (self->decoder))
return TRUE;
g_assert (self->encoder);
GST_DEBUG ("Creating internal decoder and encoder");
/* Create decoder/encoder */
self->decoder = gst_element_factory_make ("decodebin", NULL);
if (G_UNLIKELY (self->decoder == NULL))
goto no_decoder;
g_signal_connect (self->decoder, "pad-added",
G_CALLBACK (decodebin_src_pad_added_cb), self);
gst_element_set_locked_state (self->decoder, TRUE);
gst_bin_add (GST_BIN (self), self->decoder);
gst_bin_add (GST_BIN (self), gst_object_ref (self->encoder));
GST_DEBUG_OBJECT (self, "Creating internal pads");
/* Create internal pads */
/* Source pad which we'll use to feed data to decoders */
self->internal_srcpad = gst_pad_new ("internal_src", GST_PAD_SRC);
self->internal_sinkpad = gst_pad_new ("internal_sink", GST_PAD_SINK);
gst_pad_set_iterate_internal_links_function (self->internal_sinkpad, NULL);
if (!gst_element_add_pad (GST_ELEMENT (self), self->internal_sinkpad)) {
GST_ERROR_OBJECT (self, "Could not add internal sinkpad %" GST_PTR_FORMAT,
self->internal_sinkpad);
return FALSE;
}
gst_pad_set_chain_function (self->internal_sinkpad,
GST_DEBUG_FUNCPTR (internal_chain));
gst_pad_set_event_function (self->internal_sinkpad,
GST_DEBUG_FUNCPTR (internal_event_func));
gst_pad_set_active (self->internal_sinkpad, TRUE);
gst_pad_set_active (self->internal_srcpad, TRUE);
GST_DEBUG_OBJECT (self, "Linking pads to elements");
/* Link everything */
capsfilter = gst_element_factory_make ("capsfilter", NULL);
if (!gst_bin_add (GST_BIN (self), capsfilter)) {
GST_ERROR_OBJECT (self, "Could not add capsfilter!");
return FALSE;
}
gst_element_sync_state_with_parent (capsfilter);
if (!gst_element_link (self->encoder, capsfilter))
goto encoder_capsfilter_link_fail;
tmppad = gst_element_get_static_pad (capsfilter, "src");
if ((lret =
gst_pad_link_full (tmppad, self->internal_sinkpad,
GST_PAD_LINK_CHECK_NOTHING)) < GST_PAD_LINK_OK)
goto sinkpad_link_fail;
gst_object_unref (tmppad);
tmppad = gst_element_get_static_pad (self->decoder, "sink");
if (GST_PAD_LINK_FAILED (gst_pad_link_full (self->internal_srcpad,
tmppad, GST_PAD_LINK_CHECK_NOTHING)))
goto srcpad_link_fail;
gst_object_unref (tmppad);
GST_DEBUG ("Done creating internal elements/pads");
return TRUE;
no_decoder:
{
GST_WARNING ("Couldn't find a decodebin?!");
return FALSE;
}
srcpad_link_fail:
{
gst_object_unref (tmppad);
GST_WARNING ("Couldn't link internal srcpad to decoder");
return FALSE;
}
sinkpad_link_fail:
{
gst_object_unref (tmppad);
GST_WARNING ("Couldn't link encoder to internal sinkpad: %s",
gst_pad_link_get_name (lret));
return FALSE;
}
encoder_capsfilter_link_fail:
{
GST_WARNING ("Couldn't link encoder to capsfilter");
return FALSE;
}
}
static GstFlowReturn
gst_smart_encoder_reencode_gop (GstSmartEncoder * self)
{
GstFlowReturn res = GST_FLOW_OK;
GstCaps *caps = NULL;
GST_DEBUG_OBJECT (self, "Reencoding GOP!");
if (self->decoder == NULL) {
if (!setup_recoder_pipeline (self)) {
GST_ERROR_OBJECT (self, "Could not setup reencoder pipeline");
return GST_FLOW_ERROR;
}
}
/* Activate elements */
/* Set elements to PAUSED */
gst_element_set_state (self->encoder, GST_STATE_PLAYING);
gst_element_set_state (self->decoder, GST_STATE_PLAYING);
GST_INFO ("Pushing Flush start/stop to clean decoder/encoder");
gst_pad_push_event (self->internal_srcpad, gst_event_new_flush_start ());
gst_pad_push_event (self->internal_srcpad, gst_event_new_flush_stop (TRUE));
/* push segment_event */
GST_INFO ("Pushing segment_event %" GST_PTR_FORMAT, self->segment_event);
gst_pad_push_event (self->internal_srcpad,
gst_event_ref (self->stream_start_event));
caps = gst_pad_get_current_caps (self->sinkpad);
gst_pad_push_event (self->internal_srcpad, gst_event_new_caps (caps));
gst_caps_unref (caps);
gst_pad_push_event (self->internal_srcpad,
gst_event_ref (self->segment_event));
/* Push buffers through our pads */
GST_DEBUG ("Pushing %d pending buffers", g_list_length (self->pending_gop));
g_mutex_lock (&self->internal_flow_lock);
self->internal_flow = GST_FLOW_CUSTOM_SUCCESS;
g_mutex_unlock (&self->internal_flow_lock);
while (self->pending_gop) {
GstBuffer *buf = (GstBuffer *) self->pending_gop->data;
self->pending_gop =
g_list_remove_link (self->pending_gop, self->pending_gop);
res = gst_pad_push (self->internal_srcpad, buf);
if (res == GST_FLOW_EOS) {
GST_INFO_OBJECT (self, "Got eos... waiting for the event"
" waiting for encoding to be done");
break;
}
if (res != GST_FLOW_OK) {
GST_WARNING ("Error pushing pending buffers : %s",
gst_flow_get_name (res));
goto done;
}
}
GST_DEBUG_OBJECT (self, "-> Drain encoder.");
gst_pad_push_event (self->internal_srcpad, gst_event_new_eos ());
g_mutex_lock (&self->internal_flow_lock);
while (self->internal_flow == GST_FLOW_CUSTOM_SUCCESS) {
g_cond_wait (&self->internal_flow_cond, &self->internal_flow_lock);
}
g_mutex_unlock (&self->internal_flow_lock);
res = self->internal_flow;
GST_DEBUG_OBJECT (self, "Done reencoding GOP.");
gst_element_set_state (self->encoder, GST_STATE_NULL);
gst_element_set_state (self->decoder, GST_STATE_NULL);
GST_OBJECT_FLAG_UNSET (self->internal_sinkpad, GST_PAD_FLAG_EOS);
GST_OBJECT_FLAG_UNSET (self->internal_srcpad, GST_PAD_FLAG_EOS);
done:
g_list_free_full (self->pending_gop, (GDestroyNotify) gst_buffer_unref);
self->pending_gop = NULL;
return res;
}
static GstFlowReturn
gst_smart_encoder_push_pending_gop (GstSmartEncoder * self)
{
guint64 cstart, cstop;
GList *tmp;
GstFlowReturn res = GST_FLOW_OK;
GST_DEBUG ("Pushing pending GOP (%" GST_TIME_FORMAT " -- %" GST_TIME_FORMAT
")", GST_TIME_ARGS (self->gop_start), GST_TIME_ARGS (self->gop_stop));
if (self->output_segment.format == GST_FORMAT_UNDEFINED) {
gst_segment_init (&self->output_segment, GST_FORMAT_TIME);
/* Ensure that we can represent negative DTS in our 'single' segment */
self->output_segment.start = 60 * 60 * GST_SECOND * 1000;
if (!gst_pad_push_event (self->srcpad,
gst_event_new_segment (&self->output_segment))) {
GST_ERROR_OBJECT (self, "Could not push segment!");
GST_ELEMENT_FLOW_ERROR (self, GST_FLOW_ERROR);
return GST_FLOW_ERROR;
}
}
if (!self->pending_gop) {
/* This might happen on EOS */
GST_INFO_OBJECT (self, "Empty gop!");
goto done;
}
if (!gst_segment_clip (&self->input_segment, GST_FORMAT_TIME, self->gop_start,
self->gop_stop, &cstart, &cstop)) {
/* The whole GOP is outside the segment, there's most likely
* a bug somewhere. */
GST_DEBUG_OBJECT (self,
"GOP is entirely outside of the segment, upstream gave us too much data: (%"
GST_TIME_FORMAT " -- %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (self->gop_start), GST_TIME_ARGS (self->gop_stop));
for (tmp = self->pending_gop; tmp; tmp = tmp->next)
gst_buffer_unref ((GstBuffer *) tmp->data);
goto done;
}
if ((cstart != self->gop_start)
|| (cstop != self->gop_stop)) {
GST_INFO_OBJECT (self,
"GOP needs to be re-encoded from %" GST_TIME_FORMAT " to %"
GST_TIME_FORMAT " - %" GST_SEGMENT_FORMAT, GST_TIME_ARGS (cstart),
GST_TIME_ARGS (cstop), &self->input_segment);
res = gst_smart_encoder_reencode_gop (self);
} else {
/* The whole GOP is within the segment, push all pending buffers downstream */
GST_INFO_OBJECT (self,
"GOP doesn't need to be modified, pushing downstream: %" GST_TIME_FORMAT
" to %" GST_TIME_FORMAT, GST_TIME_ARGS (cstart), GST_TIME_ARGS (cstop));
self->internal_segment = self->input_segment;
for (tmp = self->pending_gop; tmp; tmp = tmp->next) {
GstBuffer *buf = (GstBuffer *) tmp->data;
res = gst_smart_encoder_finish_buffer (self, buf);
if (G_UNLIKELY (res != GST_FLOW_OK))
break;
}
}
done:
g_list_free (self->pending_gop);
self->pending_gop = NULL;
self->gop_start = GST_CLOCK_TIME_NONE;
self->gop_stop = 0;
return res;
}
static GstFlowReturn
gst_smart_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstSmartEncoder *self;
GstFlowReturn res = GST_FLOW_OK;
gboolean discont, keyframe;
GstClockTime end_time;
self = GST_SMART_ENCODER (parent->parent);
discont = GST_BUFFER_IS_DISCONT (buf);
keyframe = !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
end_time = GST_BUFFER_PTS (buf);
if (GST_CLOCK_TIME_IS_VALID (end_time))
end_time += (GST_BUFFER_DURATION_IS_VALID (buf) ? buf->duration : 0);
GST_DEBUG_OBJECT (pad,
"New buffer %s %s %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
discont ? "discont" : "", keyframe ? "keyframe" : "",
GST_TIME_ARGS (GST_BUFFER_PTS (buf)), GST_TIME_ARGS (end_time));
if (keyframe) {
/* If there's a pending GOP, flush it out */
if (self->pending_gop) {
/* Mark stop of previous gop */
if (GST_BUFFER_PTS_IS_VALID (buf)) {
if (self->gop_stop > buf->pts)
GST_WARNING_OBJECT (self, "Next gop start < current gop" " end");
self->gop_stop = buf->pts;
}
/* flush pending */
res = gst_smart_encoder_push_pending_gop (self);
if (G_UNLIKELY (res != GST_FLOW_OK))
goto beach;
}
/* Mark gop_start for new gop */
self->gop_start = GST_BUFFER_TIMESTAMP (buf);
}
/* Store buffer */
self->pending_gop = g_list_append (self->pending_gop, buf);
/* Update GOP stop position */
if (GST_CLOCK_TIME_IS_VALID (end_time))
self->gop_stop = MAX (self->gop_stop, end_time);
GST_DEBUG_OBJECT (self, "Buffer stored , Current GOP : %"
GST_TIME_FORMAT " -- %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->gop_start), GST_TIME_ARGS (self->gop_stop));
beach:
return res;
}
static gboolean
smart_encoder_sink_event (GstPad * pad, GstObject * ghostpad, GstEvent * event)
{
gboolean res = TRUE;
GstSmartEncoder *self = GST_SMART_ENCODER (ghostpad->parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
smart_encoder_reset (self);
break;
case GST_EVENT_CAPS:
if (self->last_caps) {
gst_clear_event (&event);
} else {
gst_event_parse_caps (event, &self->last_caps);
self->last_caps = gst_caps_copy (self->last_caps);
}
break;
case GST_EVENT_STREAM_START:
gst_event_replace (&self->stream_start_event, gst_event_ref (event));
break;
case GST_EVENT_SEGMENT:
{
GST_INFO_OBJECT (self, "Pushing pending GOP on new segment");
gst_smart_encoder_push_pending_gop (self);
gst_event_copy_segment (event, &self->input_segment);
GST_DEBUG_OBJECT (self, "input_segment: %" GST_SEGMENT_FORMAT,
&self->input_segment);
if (self->input_segment.format != GST_FORMAT_TIME) {
GST_ERROR_OBJECT (self, "Can't handle streams %s format",
gst_format_get_name (self->input_segment.format));
gst_event_unref (event);
return FALSE;
}
self->segment_event = event;
event = NULL;
GST_INFO_OBJECT (self, "Eating segment");
break;
}
case GST_EVENT_EOS:
if (self->input_segment.format == GST_FORMAT_TIME)
gst_smart_encoder_push_pending_gop (self);
break;
default:
break;
}
if (event)
res = gst_pad_push_event (self->srcpad, event);
return res;
}
static GstCaps *
smart_encoder_sink_getcaps (GstSmartEncoder * self, GstPad * pad,
GstCaps * filter)
{
GstCaps *peer, *tmpl, *res;
tmpl = gst_static_pad_template_get_caps (&src_template);
/* Try getting it from downstream */
peer = gst_pad_peer_query_caps (self->srcpad, tmpl);
if (peer == NULL) {
res = tmpl;
} else {
res = peer;
gst_caps_unref (tmpl);
}
if (filter) {
GstCaps *filtered_res = gst_caps_intersect (res, filter);
gst_caps_unref (res);
if (!filtered_res || gst_caps_is_empty (filtered_res)) {
res = NULL;
} else {
res = filtered_res;
}
}
return res;
}
static gboolean
_pad_sink_acceptcaps (GstPad * pad, GstSmartEncoder * self, GstCaps * caps)
{
gboolean ret;
GstCaps *modified_caps;
GstCaps *accepted_caps;
gint i, n;
GstStructure *s;
GST_DEBUG_OBJECT (pad, "%" GST_PTR_FORMAT, caps);
accepted_caps = gst_pad_get_current_caps (GST_PAD (self->srcpad));
if (accepted_caps == NULL)
accepted_caps = gst_pad_get_pad_template_caps (GST_PAD (self->srcpad));
accepted_caps = gst_caps_make_writable (accepted_caps);
GST_LOG_OBJECT (pad, "src caps %" GST_PTR_FORMAT, accepted_caps);
n = gst_caps_get_size (accepted_caps);
for (i = 0; i < n; i++) {
s = gst_caps_get_structure (accepted_caps, i);
gst_structure_remove_fields (s, "codec_data", NULL);
}
modified_caps = gst_caps_copy (caps);
n = gst_caps_get_size (modified_caps);
for (i = 0; i < n; i++) {
s = gst_caps_get_structure (modified_caps, i);
gst_structure_remove_fields (s, "codec_data", NULL);
}
ret = gst_caps_can_intersect (modified_caps, accepted_caps);
GST_DEBUG_OBJECT (pad, "%saccepted caps %" GST_PTR_FORMAT,
(ret ? "" : "Doesn't "), caps);
return ret;
}
static gboolean
smart_encoder_sink_query (GstPad * pad, GstObject * ghostpad, GstQuery * query)
{
gboolean res;
GstSmartEncoder *self = GST_SMART_ENCODER (ghostpad->parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = smart_encoder_sink_getcaps (self, pad, filter);
GST_DEBUG_OBJECT (self, "Got caps: %" GST_PTR_FORMAT, caps);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
case GST_QUERY_ACCEPT_CAPS:
{
GstCaps *caps;
gst_query_parse_accept_caps (query, &caps);
res = _pad_sink_acceptcaps (GST_PAD (pad), self, caps);
gst_query_set_accept_caps_result (query, res);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, ghostpad, query);
break;
}
return res;
}
static gboolean
gst_smart_encoder_add_parser (GstSmartEncoder * self, GstCaps * format)
{
GstPad *chainpad, *internal_chainpad, *sinkpad;
GstElement *capsfilter = gst_element_factory_make ("capsfilter", NULL);
gst_bin_add (GST_BIN (self), capsfilter);
g_object_set (capsfilter, "caps", format, NULL);
if (gst_structure_has_name (gst_caps_get_structure (format, 0),
"video/x-h264")) {
GstElement *parser = gst_element_factory_make ("h264parse", NULL);
if (!parser) {
GST_ERROR_OBJECT (self, "`h264parse` is missing, can't encode smartly");
goto failed;
}
/* Add SPS/PPS before each gop to ensure that they can be decoded
* independently */
g_object_set (parser, "config-interval", -1, NULL);
if (!gst_bin_add (GST_BIN (self), parser)) {
GST_ERROR_OBJECT (self, "Could not add parser.");
goto failed;
}
if (!gst_element_link (parser, capsfilter)) {
GST_ERROR_OBJECT (self, "Could not link capfilter and parser.");
goto failed;
}
sinkpad = gst_element_get_static_pad (parser, "sink");
} else {
sinkpad = gst_element_get_static_pad (capsfilter, "sink");
}
g_assert (sinkpad);
/* The chainpad is the pad that is linked to the srcpad of the chain
* of element that is linked to our public sinkpad, this is the pad where
* we chain the buffers either directly to our srcpad or through the
* reencoding sub chain. */
chainpad =
GST_PAD (gst_ghost_pad_new ("chainpad", capsfilter->srcpads->data));
gst_element_add_pad (GST_ELEMENT (self), chainpad);
internal_chainpad =
GST_PAD (gst_proxy_pad_get_internal (GST_PROXY_PAD (chainpad)));
gst_pad_set_chain_function (internal_chainpad, gst_smart_encoder_chain);
gst_pad_set_event_function (internal_chainpad, smart_encoder_sink_event);
gst_pad_set_query_function (internal_chainpad, smart_encoder_sink_query);
gst_ghost_pad_set_target (GST_GHOST_PAD (self->sinkpad), sinkpad);
gst_object_unref (sinkpad);
return TRUE;
failed:
return FALSE;
}
gboolean
gst_smart_encoder_set_encoder (GstSmartEncoder * self, GstCaps * format,
GstElement * encoder)
{
self->encoder = g_object_ref_sink (encoder);
gst_element_set_locked_state (self->encoder, TRUE);
return gst_smart_encoder_add_parser (self, format);
}
/******************************************
* GstElement vmethod implementations *
******************************************/
static GstStateChangeReturn
gst_smart_encoder_change_state (GstElement * element, GstStateChange transition)
{
GstSmartEncoder *self;
GstStateChangeReturn ret;
g_return_val_if_fail (GST_IS_SMART_ENCODER (element),
GST_STATE_CHANGE_FAILURE);
self = GST_SMART_ENCODER (element);
ret =
GST_ELEMENT_CLASS (gst_smart_encoder_parent_class)->change_state (element,
transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
smart_encoder_reset (self);
break;
default:
break;
}
return ret;
}
/******************************************
* GObject vmethods *
******************************************/
static void
gst_smart_encoder_finalize (GObject * object)
{
GstSmartEncoder *self = (GstSmartEncoder *) object;
g_mutex_clear (&self->internal_flow_lock);
g_cond_clear (&self->internal_flow_cond);
G_OBJECT_CLASS (gst_smart_encoder_parent_class)->finalize (object);
}
static void
gst_smart_encoder_dispose (GObject * object)
{
GstSmartEncoder *self = (GstSmartEncoder *) object;
gst_clear_object (&self->encoder);
G_OBJECT_CLASS (gst_smart_encoder_parent_class)->dispose (object);
}
static void
gst_smart_encoder_class_init (GstSmartEncoderClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
element_class = (GstElementClass *) klass;
gobject_class = G_OBJECT_CLASS (klass);
gst_smart_encoder_parent_class = g_type_class_peek_parent (klass);
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_set_static_metadata (element_class, "Smart Video Encoder",
"Codec/Recoder/Video",
"Re-encodes portions of Video that lay on segment boundaries",
"Edward Hervey <bilboed@gmail.com>");
gobject_class->dispose = (GObjectFinalizeFunc) gst_smart_encoder_dispose;
gobject_class->finalize = (GObjectFinalizeFunc) gst_smart_encoder_finalize;
element_class->change_state = gst_smart_encoder_change_state;
GST_DEBUG_CATEGORY_INIT (smart_encoder_debug, "smartencoder", 0,
"Smart Encoder");
}
static void
gst_smart_encoder_init (GstSmartEncoder * self)
{
GstPadTemplate *template = gst_static_pad_template_get (&sink_template);
self->sinkpad = gst_ghost_pad_new_no_target_from_template ("sink", template);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
gst_object_unref (template);
self->srcpad = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_use_fixed_caps (self->srcpad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
g_mutex_init (&self->internal_flow_lock);
g_cond_init (&self->internal_flow_cond);
smart_encoder_reset (self);
}