gstreamer/subprojects/gst-plugins-good/gst/rtp/gstrtpvp8pay.c

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/*
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* gstrtpvp8pay.c - Source for GstRtpVP8Pay
* Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2011 Collabora Ltd.
* Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gst/base/gstbitreader.h>
#include <gst/rtp/gstrtppayloads.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include "gstrtpelements.h"
#include "dboolhuff.h"
#include "gstrtpvp8pay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp8_pay_debug);
#define GST_CAT_DEFAULT gst_rtp_vp8_pay_debug
#define DEFAULT_PICTURE_ID_MODE VP8_PAY_NO_PICTURE_ID
#define DEFAULT_PICTURE_ID_OFFSET (-1)
enum
{
PROP_0,
PROP_PICTURE_ID_MODE,
PROP_PICTURE_ID_OFFSET
};
#define GST_TYPE_RTP_VP8_PAY_PICTURE_ID_MODE (gst_rtp_vp8_pay_picture_id_mode_get_type())
static GType
gst_rtp_vp8_pay_picture_id_mode_get_type (void)
{
static GType mode_type = 0;
static const GEnumValue modes[] = {
{VP8_PAY_NO_PICTURE_ID, "No Picture ID", "none"},
{VP8_PAY_PICTURE_ID_7BITS, "7-bit Picture ID", "7-bit"},
{VP8_PAY_PICTURE_ID_15BITS, "15-bit Picture ID", "15-bit"},
{0, NULL, NULL},
};
if (!mode_type) {
mode_type = g_enum_register_static ("GstVP8RTPPayMode", modes);
}
return mode_type;
}
static void gst_rtp_vp8_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_rtp_vp8_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload,
GstBuffer * buffer);
static gboolean gst_rtp_vp8_pay_sink_event (GstRTPBasePayload * payload,
GstEvent * event);
static gboolean gst_rtp_vp8_pay_set_caps (GstRTPBasePayload * payload,
GstCaps * caps);
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G_DEFINE_TYPE (GstRtpVP8Pay, gst_rtp_vp8_pay, GST_TYPE_RTP_BASE_PAYLOAD);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpvp8pay, "rtpvp8pay",
GST_RANK_MARGINAL, GST_TYPE_RTP_VP8_PAY, rtp_element_init (plugin));
static GstStaticPadTemplate gst_rtp_vp8_pay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ","
"clock-rate = (int) 90000, encoding-name = (string) { \"VP8\", \"VP8-DRAFT-IETF-01\" }"));
static GstStaticPadTemplate gst_rtp_vp8_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp8"));
static gint
picture_id_field_len (PictureIDMode mode)
{
if (VP8_PAY_NO_PICTURE_ID == mode)
return 0;
if (VP8_PAY_PICTURE_ID_7BITS == mode)
return 7;
return 15;
}
static void
gst_rtp_vp8_pay_picture_id_reset (GstRtpVP8Pay * obj)
{
gint nbits;
if (obj->picture_id_offset == -1)
obj->picture_id = g_random_int ();
else
obj->picture_id = obj->picture_id_offset;
nbits = picture_id_field_len (obj->picture_id_mode);
obj->picture_id &= (1 << nbits) - 1;
}
static void
gst_rtp_vp8_pay_picture_id_increment (GstRtpVP8Pay * obj)
{
gint nbits;
if (obj->picture_id_mode == VP8_PAY_NO_PICTURE_ID)
return;
nbits = picture_id_field_len (obj->picture_id_mode);
obj->picture_id++;
obj->picture_id &= (1 << nbits) - 1;
}
static void
gst_rtp_vp8_pay_reset (GstRtpVP8Pay * obj)
{
gst_rtp_vp8_pay_picture_id_reset (obj);
/* tl0picidx MAY start at a random value, but there's no point. Initialize
* so that first packet will use 0 for convenience */
obj->tl0picidx = -1;
obj->temporal_scalability_fields_present = FALSE;
}
static void
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gst_rtp_vp8_pay_init (GstRtpVP8Pay * obj)
{
obj->picture_id_mode = DEFAULT_PICTURE_ID_MODE;
obj->picture_id_offset = DEFAULT_PICTURE_ID_OFFSET;
gst_rtp_vp8_pay_reset (obj);
}
static void
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gst_rtp_vp8_pay_class_init (GstRtpVP8PayClass * gst_rtp_vp8_pay_class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (gst_rtp_vp8_pay_class);
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GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp8_pay_class);
GstRTPBasePayloadClass *pay_class =
GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp8_pay_class);
gobject_class->set_property = gst_rtp_vp8_pay_set_property;
gobject_class->get_property = gst_rtp_vp8_pay_get_property;
g_object_class_install_property (gobject_class, PROP_PICTURE_ID_MODE,
g_param_spec_enum ("picture-id-mode", "Picture ID Mode",
"The picture ID mode for payloading",
GST_TYPE_RTP_VP8_PAY_PICTURE_ID_MODE, DEFAULT_PICTURE_ID_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* rtpvp8pay:picture-id-offset:
*
* Offset to add to the initial picture-id (-1 = random)
*
* Since: 1.20
*/
g_object_class_install_property (gobject_class, PROP_PICTURE_ID_OFFSET,
g_param_spec_int ("picture-id-offset", "Picture ID offset",
"Offset to add to the initial picture-id (-1 = random)",
-1, 0x7FFF, DEFAULT_PICTURE_ID_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class,
&gst_rtp_vp8_pay_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_rtp_vp8_pay_src_template);
gst_element_class_set_static_metadata (element_class, "RTP VP8 payloader",
"Codec/Payloader/Network/RTP",
"Puts VP8 video in RTP packets", "Sjoerd Simons <sjoerd@luon.net>");
pay_class->handle_buffer = gst_rtp_vp8_pay_handle_buffer;
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pay_class->sink_event = gst_rtp_vp8_pay_sink_event;
pay_class->set_caps = gst_rtp_vp8_pay_set_caps;
GST_DEBUG_CATEGORY_INIT (gst_rtp_vp8_pay_debug, "rtpvp8pay", 0,
"VP8 Video RTP Payloader");
gst_type_mark_as_plugin_api (GST_TYPE_RTP_VP8_PAY_PICTURE_ID_MODE, 0);
}
static void
gst_rtp_vp8_pay_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRtpVP8Pay *rtpvp8pay = GST_RTP_VP8_PAY (object);
switch (prop_id) {
case PROP_PICTURE_ID_MODE:
rtpvp8pay->picture_id_mode = g_value_get_enum (value);
gst_rtp_vp8_pay_picture_id_reset (rtpvp8pay);
break;
case PROP_PICTURE_ID_OFFSET:
rtpvp8pay->picture_id_offset = g_value_get_int (value);
gst_rtp_vp8_pay_picture_id_reset (rtpvp8pay);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_vp8_pay_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstRtpVP8Pay *rtpvp8pay = GST_RTP_VP8_PAY (object);
switch (prop_id) {
case PROP_PICTURE_ID_MODE:
g_value_set_enum (value, rtpvp8pay->picture_id_mode);
break;
case PROP_PICTURE_ID_OFFSET:
g_value_set_int (value, rtpvp8pay->picture_id_offset);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_rtp_vp8_pay_parse_frame (GstRtpVP8Pay * self, GstBuffer * buffer,
gsize buffer_size)
{
GstMapInfo map = GST_MAP_INFO_INIT;
GstBitReader reader;
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guint8 *data;
gsize size;
int i;
gboolean keyframe;
guint32 partition0_size;
guint8 version;
guint8 tmp8 = 0;
guint8 partitions;
guint offset;
BOOL_DECODER bc;
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guint8 *pdata;
if (G_UNLIKELY (buffer_size < 3))
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goto error;
if (!gst_buffer_map (buffer, &map, GST_MAP_READ) || !map.data)
goto error;
data = map.data;
size = map.size;
gst_bit_reader_init (&reader, data, size);
self->is_keyframe = keyframe = ((data[0] & 0x1) == 0);
version = (data[0] >> 1) & 0x7;
if (G_UNLIKELY (version > 3)) {
GST_ERROR_OBJECT (self, "Unknown VP8 version %u", version);
goto error;
}
/* keyframe, version and show_frame use 5 bits */
partition0_size = data[2] << 11 | data[1] << 3 | (data[0] >> 5);
/* Include the uncompressed data blob in the first partition */
offset = keyframe ? 10 : 3;
partition0_size += offset;
if (!gst_bit_reader_skip (&reader, 24))
goto error;
if (keyframe) {
/* check start tag: 0x9d 0x01 0x2a */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp8, 8) || tmp8 != 0x9d)
goto error;
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp8, 8) || tmp8 != 0x01)
goto error;
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp8, 8) || tmp8 != 0x2a)
goto error;
/* Skip horizontal size code (16 bits) vertical size code (16 bits) */
if (!gst_bit_reader_skip (&reader, 32))
goto error;
}
offset = keyframe ? 10 : 3;
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vp8dx_start_decode (&bc, data + offset, size - offset);
if (keyframe) {
/* color space (1 bit) and clamping type (1 bit) */
vp8dx_decode_bool (&bc, 0x80);
vp8dx_decode_bool (&bc, 0x80);
}
/* segmentation_enabled */
if (vp8dx_decode_bool (&bc, 0x80)) {
guint8 update_mb_segmentation_map = vp8dx_decode_bool (&bc, 0x80);
guint8 update_segment_feature_data = vp8dx_decode_bool (&bc, 0x80);
if (update_segment_feature_data) {
/* skip segment feature mode */
vp8dx_decode_bool (&bc, 0x80);
/* quantizer update */
for (i = 0; i < 4; i++) {
/* skip flagged quantizer value (7 bits) and sign (1 bit) */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 8);
}
/* loop filter update */
for (i = 0; i < 4; i++) {
/* skip flagged lf update value (6 bits) and sign (1 bit) */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 7);
}
}
if (update_mb_segmentation_map) {
/* segment prob update */
for (i = 0; i < 3; i++) {
/* skip flagged segment prob */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 8);
}
}
}
/* skip filter type (1 bit), loop filter level (6 bits) and
* sharpness level (3 bits) */
vp8_decode_value (&bc, 1);
vp8_decode_value (&bc, 6);
vp8_decode_value (&bc, 3);
/* loop_filter_adj_enabled */
if (vp8dx_decode_bool (&bc, 0x80)) {
/* delta update */
if (vp8dx_decode_bool (&bc, 0x80)) {
for (i = 0; i < 8; i++) {
/* 8 updates, 1 bit indicate whether there is one and if follow by a
* 7 bit update */
if (vp8dx_decode_bool (&bc, 0x80))
vp8_decode_value (&bc, 7);
}
}
}
if (vp8dx_bool_error (&bc))
goto error;
tmp8 = vp8_decode_value (&bc, 2);
partitions = 1 << tmp8;
/* Check if things are still sensible */
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if (partition0_size + (partitions - 1) * 3 >= size)
goto error;
/* partition data is right after the mode partition */
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pdata = data + partition0_size;
/* Set up mapping */
self->n_partitions = partitions + 1;
self->partition_offset[0] = 0;
self->partition_size[0] = partition0_size + (partitions - 1) * 3;
self->partition_offset[1] = self->partition_size[0];
for (i = 1; i < partitions; i++) {
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guint psize = (pdata[2] << 16 | pdata[1] << 8 | pdata[0]);
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pdata += 3;
self->partition_size[i] = psize;
self->partition_offset[i + 1] = self->partition_offset[i] + psize;
}
/* Check that our partition offsets and sizes don't go outsize the buffer
* size. */
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if (self->partition_offset[i] >= size)
goto error;
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self->partition_size[i] = size - self->partition_offset[i];
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self->partition_offset[i + 1] = size;
gst_buffer_unmap (buffer, &map);
if (keyframe)
GST_DEBUG_OBJECT (self, "Parsed keyframe");
return TRUE;
error:
GST_DEBUG ("Failed to parse frame");
if (map.memory != NULL) {
gst_buffer_unmap (buffer, &map);
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}
return FALSE;
}
static guint
gst_rtp_vp8_offset_to_partition (GstRtpVP8Pay * self, guint offset)
{
int i;
for (i = 1; i < self->n_partitions; i++) {
if (offset < self->partition_offset[i])
return i - 1;
}
return i - 1;
}
static gsize
gst_rtp_vp8_calc_header_len (GstRtpVP8Pay * self)
{
gsize len;
switch (self->picture_id_mode) {
case VP8_PAY_PICTURE_ID_7BITS:
len = 1;
break;
case VP8_PAY_PICTURE_ID_15BITS:
len = 2;
break;
case VP8_PAY_NO_PICTURE_ID:
default:
len = 0;
break;
}
if (self->temporal_scalability_fields_present) {
/* Add on space for TL0PICIDX and TID/Y/KEYIDX */
len += 2;
}
if (len > 0) {
/* All fields above are extension, so allocate space for the ECB field */
len++;
}
return len + 1; /* computed + fixed size header */
}
/* When growing the vp8 header keep max payload len calculation in sync */
static GstBuffer *
gst_rtp_vp8_create_header_buffer (GstRtpVP8Pay * self, guint8 partid,
gboolean start, gboolean mark, GstBuffer * in, GstCustomMeta * meta)
{
GstBuffer *out;
guint8 *p;
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GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
out =
gst_rtp_base_payload_allocate_output_buffer (GST_RTP_BASE_PAYLOAD_CAST
(self), gst_rtp_vp8_calc_header_len (self), 0, 0);
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gst_rtp_buffer_map (out, GST_MAP_READWRITE, &rtpbuffer);
p = gst_rtp_buffer_get_payload (&rtpbuffer);
/* X=0,R=0,N=0,S=start,PartID=partid */
p[0] = (start << 4) | partid;
if (GST_BUFFER_FLAG_IS_SET (in, GST_BUFFER_FLAG_DROPPABLE)) {
/* Enable N=1 */
p[0] |= 0x20;
}
if (self->picture_id_mode != VP8_PAY_NO_PICTURE_ID ||
self->temporal_scalability_fields_present) {
gint index;
/* Enable X=1 */
p[0] |= 0x80;
/* X: I=0,L=0,T=0,K=0,RSV=0 */
p[1] = 0x00;
if (self->picture_id_mode != VP8_PAY_NO_PICTURE_ID) {
/* Set I bit */
p[1] |= 0x80;
}
if (self->temporal_scalability_fields_present) {
/* Set L and T bits */
p[1] |= 0x60;
}
/* Insert picture ID */
if (self->picture_id_mode == VP8_PAY_PICTURE_ID_7BITS) {
/* I: 7 bit picture_id */
p[2] = self->picture_id & 0x7F;
index = 3;
} else if (self->picture_id_mode == VP8_PAY_PICTURE_ID_15BITS) {
/* I: 15 bit picture_id */
p[2] = 0x80 | ((self->picture_id & 0x7FFF) >> 8);
p[3] = self->picture_id & 0xFF;
index = 4;
} else {
index = 2;
}
/* Insert TL0PICIDX and TID/Y/KEYIDX */
if (self->temporal_scalability_fields_present) {
/* The meta contains tl0picidx from the encoder, but we need to ensure
* that tl0picidx is increasing correctly. The encoder may reset it's
* state and counter, but we cannot. Therefore, we cannot simply copy
* the value into the header.*/
guint temporal_layer = 0;
gboolean layer_sync = FALSE;
gboolean use_temporal_scaling = FALSE;
if (meta) {
GstStructure *s = gst_custom_meta_get_structure (meta);
gst_structure_get_boolean (s, "use-temporal-scaling",
&use_temporal_scaling);
if (use_temporal_scaling)
gst_structure_get (s, "layer-id", G_TYPE_UINT, &temporal_layer,
"layer-sync", G_TYPE_BOOLEAN, &layer_sync, NULL);
}
/* FIXME: Support a prediction structure where higher layers don't
* necessarily refer to the last base layer frame, ie they use an older
* tl0picidx as signalled in the meta */
if (temporal_layer == 0 && start)
self->tl0picidx++;
p[index] = self->tl0picidx & 0xFF;
p[index + 1] = ((temporal_layer << 6) | (layer_sync << 5)) & 0xFF;
}
}
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gst_rtp_buffer_set_marker (&rtpbuffer, mark);
gst_rtp_buffer_unmap (&rtpbuffer);
GST_BUFFER_DURATION (out) = GST_BUFFER_DURATION (in);
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GST_BUFFER_PTS (out) = GST_BUFFER_PTS (in);
return out;
}
static gboolean
foreach_metadata_drop (GstBuffer * buf, GstMeta ** meta, gpointer user_data)
{
GstElement *element = user_data;
const GstMetaInfo *info = (*meta)->info;
if (gst_meta_info_is_custom (info) &&
gst_custom_meta_has_name ((GstCustomMeta *) * meta, "GstVP8Meta")) {
GST_DEBUG_OBJECT (element, "dropping GstVP8Meta");
*meta = NULL;
}
return TRUE;
}
static void
gst_rtp_vp8_drop_vp8_meta (gpointer element, GstBuffer * buf)
{
gst_buffer_foreach_meta (buf, foreach_metadata_drop, element);
}
static guint
gst_rtp_vp8_payload_next (GstRtpVP8Pay * self, GstBufferList * list,
guint offset, GstBuffer * buffer, gsize buffer_size, gsize max_payload_len,
GstCustomMeta * meta)
{
guint partition;
GstBuffer *header;
GstBuffer *sub;
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GstBuffer *out;
gboolean mark;
gboolean start;
gsize remaining;
gsize available;
remaining = buffer_size - offset;
available = max_payload_len;
if (available > remaining)
available = remaining;
if (meta) {
/* If meta is present, then we have no partition offset information,
* so always emit PID 0 and set the start bit for the first packet
* of a frame only (c.f. RFC7741 $4.4)
*/
partition = 0;
start = (offset == 0);
} else {
partition = gst_rtp_vp8_offset_to_partition (self, offset);
g_assert (partition < self->n_partitions);
start = (offset == self->partition_offset[partition]);
}
mark = (remaining == available);
/* whole set of partitions, payload them and done */
header = gst_rtp_vp8_create_header_buffer (self, partition,
start, mark, buffer, meta);
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sub = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offset, available);
gst_rtp_copy_video_meta (self, header, buffer);
gst_rtp_vp8_drop_vp8_meta (self, header);
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out = gst_buffer_append (header, sub);
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gst_buffer_list_insert (list, -1, out);
return available;
}
static GstFlowReturn
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gst_rtp_vp8_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer)
{
GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
GstFlowReturn ret;
GstBufferList *list;
GstCustomMeta *meta;
gsize size, max_paylen;
guint offset, mtu, vp8_hdr_len;
size = gst_buffer_get_size (buffer);
meta = gst_buffer_get_custom_meta (buffer, "GstVP8Meta");
if (G_UNLIKELY (!gst_rtp_vp8_pay_parse_frame (self, buffer, size))) {
GST_ELEMENT_ERROR (self, STREAM, ENCODE, (NULL),
("Failed to parse VP8 frame"));
return GST_FLOW_ERROR;
}
if (meta) {
GstStructure *s = gst_custom_meta_get_structure (meta);
gboolean use_temporal_scaling;
/* For interop it's most likely better to keep the temporal scalability
* fields present if the stream previously had them present. Alternating
* whether these fields are present or not may confuse the receiver. */
gst_structure_get_boolean (s, "use-temporal-scaling",
&use_temporal_scaling);
if (use_temporal_scaling)
self->temporal_scalability_fields_present = TRUE;
}
mtu = GST_RTP_BASE_PAYLOAD_MTU (payload);
vp8_hdr_len = gst_rtp_vp8_calc_header_len (self);
max_paylen = gst_rtp_buffer_calc_payload_len (mtu - vp8_hdr_len, 0,
gst_rtp_base_payload_get_source_count (payload, buffer));
list = gst_buffer_list_new_sized ((size / max_paylen) + 1);
offset = 0;
while (offset < size) {
offset +=
gst_rtp_vp8_payload_next (self, list, offset, buffer, size,
max_paylen, meta);
}
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ret = gst_rtp_base_payload_push_list (payload, list);
gst_rtp_vp8_pay_picture_id_increment (self);
gst_buffer_unref (buffer);
return ret;
}
static gboolean
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gst_rtp_vp8_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
{
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GstRtpVP8Pay *self = GST_RTP_VP8_PAY (payload);
if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_START) {
gst_rtp_vp8_pay_reset (self);
}
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return GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp8_pay_parent_class)->sink_event
(payload, event);
}
static gboolean
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gst_rtp_vp8_pay_set_caps (GstRTPBasePayload * payload, GstCaps * caps)
{
GstCaps *src_caps;
const char *encoding_name = "VP8";
src_caps = gst_pad_get_allowed_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload));
if (src_caps) {
GstStructure *s;
const GValue *value;
s = gst_caps_get_structure (src_caps, 0);
if (gst_structure_has_field (s, "encoding-name")) {
GValue default_value = G_VALUE_INIT;
g_value_init (&default_value, G_TYPE_STRING);
g_value_set_static_string (&default_value, encoding_name);
value = gst_structure_get_value (s, "encoding-name");
if (!gst_value_can_intersect (&default_value, value))
encoding_name = "VP8-DRAFT-IETF-01";
}
gst_caps_unref (src_caps);
}
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gst_rtp_base_payload_set_options (payload, "video", TRUE,
encoding_name, 90000);
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return gst_rtp_base_payload_set_outcaps (payload, NULL);
}