Commit 5faa9c11 authored by Stian Selnes's avatar Stian Selnes Committed by Sebastian Dröge

rtpvp9pay: rtpvp9depay: Initial implementation of draft 01

Quick and dirty implementation of an RTP payloader and depayloader
for VP9. In particalur it assumes no spatial or temporal layering,
non-flexible mode, and some other bits and pieces.

https://bugzilla.gnome.org/show_bug.cgi?id=754773
parent dc70bfd3
......@@ -83,6 +83,8 @@ libgstrtp_la_SOURCES = \
gstrtpvorbispay.c \
gstrtpvp8depay.c \
gstrtpvp8pay.c \
gstrtpvp9depay.c \
gstrtpvp9pay.c \
gstrtpvrawdepay.c \
gstrtpvrawpay.c \
gstrtpstreampay.c \
......@@ -188,6 +190,8 @@ noinst_HEADERS = \
gstrtpvorbispay.h \
gstrtpvp8depay.h \
gstrtpvp8pay.h \
gstrtpvp9depay.h \
gstrtpvp9pay.h \
gstrtpvrawdepay.h \
gstrtpvrawpay.h \
gstrtpstreampay.h \
......
......@@ -101,6 +101,8 @@
#include "gstrtpvorbispay.h"
#include "gstrtpvp8depay.h"
#include "gstrtpvp8pay.h"
#include "gstrtpvp9depay.h"
#include "gstrtpvp9pay.h"
#include "gstrtpvrawdepay.h"
#include "gstrtpvrawpay.h"
#include "gstrtpstreampay.h"
......@@ -345,6 +347,12 @@ plugin_init (GstPlugin * plugin)
if (!gst_rtp_vp8_pay_plugin_init (plugin))
return FALSE;
if (!gst_rtp_vp9_depay_plugin_init (plugin))
return FALSE;
if (!gst_rtp_vp9_pay_plugin_init (plugin))
return FALSE;
if (!gst_rtp_vraw_depay_plugin_init (plugin))
return FALSE;
......
/* gstrtpvp9depay.c - Source for GstRtpVP9Depay
* Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2011 Collabora Ltd.
* Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
* Copyright (C) 2015 Stian Selnes <stian@pexip.com>
*
* 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 "gstrtpvp9depay.h"
#include "gstrtputils.h"
#include <gst/video/video.h>
#include <stdio.h>
GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp9_depay_debug);
#define GST_CAT_DEFAULT gst_rtp_vp9_depay_debug
static void gst_rtp_vp9_depay_dispose (GObject * object);
static GstBuffer *gst_rtp_vp9_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
static GstStateChangeReturn gst_rtp_vp9_depay_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_rtp_vp9_depay_handle_event (GstRTPBaseDepayload * depay,
GstEvent * event);
G_DEFINE_TYPE (GstRtpVP9Depay, gst_rtp_vp9_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
static GstStaticPadTemplate gst_rtp_vp9_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp9"));
static GstStaticPadTemplate gst_rtp_vp9_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"clock-rate = (int) 90000,"
"media = (string) \"video\","
"encoding-name = (string) { \"VP9\", \"VP9-DRAFT-IETF-01\" }"));
static void
gst_rtp_vp9_depay_init (GstRtpVP9Depay * self)
{
self->adapter = gst_adapter_new ();
self->started = FALSE;
}
static void
gst_rtp_vp9_depay_class_init (GstRtpVP9DepayClass * gst_rtp_vp9_depay_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (gst_rtp_vp9_depay_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp9_depay_class);
GstRTPBaseDepayloadClass *depay_class =
(GstRTPBaseDepayloadClass *) (gst_rtp_vp9_depay_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp9_depay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp9_depay_src_template));
gst_element_class_set_static_metadata (element_class, "RTP VP9 depayloader",
"Codec/Depayloader/Network/RTP",
"Extracts VP9 video from RTP packets)",
"Stian Selnes <stian@pexip.com>");
object_class->dispose = gst_rtp_vp9_depay_dispose;
element_class->change_state = gst_rtp_vp9_depay_change_state;
depay_class->process_rtp_packet = gst_rtp_vp9_depay_process;
depay_class->handle_event = gst_rtp_vp9_depay_handle_event;
GST_DEBUG_CATEGORY_INIT (gst_rtp_vp9_depay_debug, "rtpvp9depay", 0,
"VP9 Video RTP Depayloader");
}
static void
gst_rtp_vp9_depay_dispose (GObject * object)
{
GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (object);
if (self->adapter != NULL)
g_object_unref (self->adapter);
self->adapter = NULL;
/* release any references held by the object here */
if (G_OBJECT_CLASS (gst_rtp_vp9_depay_parent_class)->dispose)
G_OBJECT_CLASS (gst_rtp_vp9_depay_parent_class)->dispose (object);
}
static GstBuffer *
gst_rtp_vp9_depay_process (GstRTPBaseDepayload * depay, GstRTPBuffer * rtp)
{
GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (depay);
GstBuffer *payload;
guint8 *data;
guint hdrsize = 1;
guint size;
gint spatial_layer = 0;
gboolean i_bit, p_bit, l_bit, f_bit, b_bit, e_bit, v_bit;
if (G_UNLIKELY (GST_BUFFER_IS_DISCONT (rtp->buffer))) {
GST_LOG_OBJECT (self, "Discontinuity, flushing adapter");
gst_adapter_clear (self->adapter);
self->started = FALSE;
}
size = gst_rtp_buffer_get_payload_len (rtp);
/* Mandatory with at least one header and one vp9 byte */
if (G_UNLIKELY (size < hdrsize + 1))
goto too_small;
data = gst_rtp_buffer_get_payload (rtp);
i_bit = (data[0] & 0x80) != 0;
p_bit = (data[0] & 0x40) != 0;
l_bit = (data[0] & 0x20) != 0;
f_bit = (data[0] & 0x10) != 0;
b_bit = (data[0] & 0x08) != 0;
e_bit = (data[0] & 0x04) != 0;
v_bit = (data[0] & 0x02) != 0;
if (G_UNLIKELY (!self->started)) {
/* Check if this is the start of a VP9 layer frame, otherwise bail */
if (!b_bit)
goto done;
self->started = TRUE;
}
GST_TRACE_OBJECT (self, "IPLFBEV : %d%d%d%d%d%d%d", i_bit, p_bit, l_bit,
f_bit, b_bit, e_bit, v_bit);
/* Check I optional header Picture ID */
if (i_bit) {
hdrsize++;
if (G_UNLIKELY (size < hdrsize + 1))
goto too_small;
/* Check M for 15 bits PictureID */
if ((data[1] & 0x80) != 0) {
hdrsize++;
if (G_UNLIKELY (size < hdrsize + 1))
goto too_small;
}
}
/* flexible-mode not implemented */
g_assert (!f_bit);
/* Check L optional header layer indices */
if (l_bit) {
hdrsize++;
/* Check TL0PICIDX temporal layer zero index (non-flexible mode) */
if (!f_bit)
hdrsize++;
}
/* Check V optional Scalability Structure */
if (v_bit) {
guint n_s, y_bit, g_bit;
guint8 *ss = &data[hdrsize];
guint sssize = 1;
if (G_UNLIKELY (size < hdrsize + sssize + 1))
goto too_small;
n_s = (ss[0] & 0xe0) >> 5;
y_bit = (ss[0] & 0x10) != 0;
g_bit = (ss[0] & 0x08) != 0;
GST_TRACE_OBJECT (self, "SS header: N_S=%u, Y=%u, G=%u", n_s, y_bit, g_bit);
sssize += y_bit ? (n_s + 1) * 4 : 0;
if (G_UNLIKELY (size < hdrsize + sssize + 1))
goto too_small;
if (y_bit) {
guint i;
for (i = 0; i <= n_s; i++) {
/* For now, simply use the last layer specified for width and height */
self->ss_width = ss[1 + i * 4] * 256 + ss[2 + i * 4];
self->ss_height = ss[3 + i * 4] * 256 + ss[4 + i * 4];
GST_TRACE_OBJECT (self, "N_S[%d]: WIDTH=%u, HEIGHT=%u", i,
self->ss_width, self->ss_height);
}
}
if (g_bit) {
guint i, j;
guint n_g = ss[sssize];
sssize++;
if (G_UNLIKELY (size < hdrsize + sssize + 1))
goto too_small;
for (i = 0; i < n_g; i++) {
guint t = (ss[sssize] & 0xe0) >> 5;
guint u = (ss[sssize] & 0x10) >> 4;
guint r = (ss[sssize] & 0x0c) >> 2;
GST_TRACE_OBJECT (self, "N_G[%u]: 0x%02x -> T=%u, U=%u, R=%u", i,
ss[sssize], t, u, r);
for (j = 0; j < r; j++)
GST_TRACE_OBJECT (self, " R[%u]: P_DIFF=%u", j, ss[sssize + 1 + j]);
sssize += 1 + r;
if (G_UNLIKELY (size < hdrsize + sssize + 1))
goto too_small;
}
}
hdrsize += sssize;
}
GST_DEBUG_OBJECT (depay, "hdrsize %u, size %u", hdrsize, size);
if (G_UNLIKELY (hdrsize >= size))
goto too_small;
payload = gst_rtp_buffer_get_payload_subbuffer (rtp, hdrsize, -1);
{
GstMapInfo map;
gst_buffer_map (payload, &map, GST_MAP_READ);
GST_MEMDUMP_OBJECT (self, "vp9 payload", map.data, 16);
gst_buffer_unmap (payload, &map);
}
gst_adapter_push (self->adapter, payload);
/* Marker indicates that it was the last rtp packet for this frame */
if (gst_rtp_buffer_get_marker (rtp)) {
GstBuffer *out;
gboolean key_frame_first_layer = !p_bit && spatial_layer == 0;
if (gst_adapter_available (self->adapter) < 10)
goto too_small;
out = gst_adapter_take_buffer (self->adapter,
gst_adapter_available (self->adapter));
self->started = FALSE;
/* mark keyframes */
out = gst_buffer_make_writable (out);
/* Filter away all metas that are not sensible to copy */
gst_rtp_drop_meta (GST_ELEMENT_CAST (self), out,
g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
if (!key_frame_first_layer) {
GST_BUFFER_FLAG_SET (out, GST_BUFFER_FLAG_DELTA_UNIT);
if (!self->caps_sent) {
gst_buffer_unref (out);
out = NULL;
GST_INFO_OBJECT (self, "Dropping inter-frame before intra-frame");
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depay),
gst_video_event_new_upstream_force_key_unit (GST_CLOCK_TIME_NONE,
TRUE, 0));
}
} else {
GST_BUFFER_FLAG_UNSET (out, GST_BUFFER_FLAG_DELTA_UNIT);
if (self->last_width != self->ss_width ||
self->last_height != self->ss_height) {
GstCaps *srccaps;
/* Width and height are optional in the RTP header. Consider to parse
* the frame header in addition if missing from RTP header */
if (self->ss_width != 0 && self->ss_height != 0) {
srccaps = gst_caps_new_simple ("video/x-vp9",
"framerate", GST_TYPE_FRACTION, 0, 1,
"width", G_TYPE_INT, self->ss_width,
"height", G_TYPE_INT, self->ss_height, NULL);
} else {
srccaps = gst_caps_new_simple ("video/x-vp9",
"framerate", GST_TYPE_FRACTION, 0, 1, NULL);
}
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depay), srccaps);
gst_caps_unref (srccaps);
self->caps_sent = TRUE;
self->last_width = self->ss_width;
self->last_height = self->ss_height;
self->ss_width = 0;
self->ss_height = 0;
}
}
return out;
}
done:
return NULL;
too_small:
GST_LOG_OBJECT (self, "Invalid rtp packet (too small), ignoring");
gst_adapter_clear (self->adapter);
self->started = FALSE;
goto done;
}
static GstStateChangeReturn
gst_rtp_vp9_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
self->last_width = -1;
self->last_height = -1;
self->caps_sent = FALSE;
break;
default:
break;
}
return
GST_ELEMENT_CLASS (gst_rtp_vp9_depay_parent_class)->change_state (element,
transition);
}
static gboolean
gst_rtp_vp9_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
{
GstRtpVP9Depay *self = GST_RTP_VP9_DEPAY (depay);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
self->last_width = -1;
self->last_height = -1;
break;
default:
break;
}
return
GST_RTP_BASE_DEPAYLOAD_CLASS
(gst_rtp_vp9_depay_parent_class)->handle_event (depay, event);
}
gboolean
gst_rtp_vp9_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpvp9depay",
GST_RANK_MARGINAL, GST_TYPE_RTP_VP9_DEPAY);
}
/*
* gstrtpvp9depay.h - Header for GstRtpVP9Depay
* Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2015 Stian Selnes <stian@pexip.com>
*
* 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
*/
#ifndef __GST_RTP_VP9_DEPAY_H__
#define __GST_RTP_VP9_DEPAY_H__
#include <gst/base/gstadapter.h>
#include <gst/rtp/gstrtpbasedepayload.h>
G_BEGIN_DECLS
#define GST_TYPE_RTP_VP9_DEPAY \
(gst_rtp_vp9_depay_get_type())
#define GST_RTP_VP9_DEPAY(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_RTP_VP9_DEPAY, GstRtpVP9Depay))
#define GST_RTP_VP9_DEPAY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_RTP_VP9_DEPAY, \
GstRtpVP9DepayClass))
#define GST_IS_RTP_VP9_DEPAY(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_RTP_VP9_DEPAY))
#define GST_IS_RTP_VP9_DEPAY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_RTP_VP9_DEPAY))
#define GST_RTP_VP9_DEPAY_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_RTP_VP9_DEPAY, \
GstRtpVP9DepayClass))
typedef struct _GstRtpVP9Depay GstRtpVP9Depay;
typedef struct _GstRtpVP9DepayClass GstRtpVP9DepayClass;
struct _GstRtpVP9DepayClass
{
GstRTPBaseDepayloadClass parent_class;
};
struct _GstRtpVP9Depay
{
GstRTPBaseDepayload parent;
GstAdapter *adapter;
gboolean started;
gint ss_width;
gint ss_height;
gint last_width;
gint last_height;
gboolean caps_sent;
};
GType gst_rtp_vp9_depay_get_type (void);
gboolean gst_rtp_vp9_depay_plugin_init (GstPlugin * plugin);
G_END_DECLS
#endif /* #ifndef __GST_RTP_VP9_DEPAY_H__ */
/*
* gstrtpvp9pay.c - Source for GstRtpVP9Pay
* Copyright (C) 2011 Sjoerd Simons <sjoerd@luon.net>
* Copyright (C) 2011 Collabora Ltd.
* Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
* Copyright (C) 2015 Stian Selnes <stian@pexip.com>
*
* 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 "dboolhuff.h"
#include "gstrtpvp9pay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_vp9_pay_debug);
#define GST_CAT_DEFAULT gst_rtp_vp9_pay_debug
#define DEFAULT_PICTURE_ID_MODE VP9_PAY_NO_PICTURE_ID
enum
{
PROP_0,
PROP_PICTURE_ID_MODE
};
#define GST_TYPE_RTP_VP9_PAY_PICTURE_ID_MODE (gst_rtp_vp9_pay_picture_id_mode_get_type())
static GType
gst_rtp_vp9_pay_picture_id_mode_get_type (void)
{
static GType mode_type = 0;
static const GEnumValue modes[] = {
{VP9_PAY_NO_PICTURE_ID, "No Picture ID", "none"},
{VP9_PAY_PICTURE_ID_7BITS, "7-bit Picture ID", "7-bit"},
{VP9_PAY_PICTURE_ID_15BITS, "15-bit Picture ID", "15-bit"},
{0, NULL, NULL},
};
if (!mode_type) {
mode_type = g_enum_register_static ("GstVP9RTPPayMode", modes);
}
return mode_type;
}
static void gst_rtp_vp9_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_rtp_vp9_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_rtp_vp9_pay_handle_buffer (GstRTPBasePayload * payload,
GstBuffer * buffer);
static gboolean gst_rtp_vp9_pay_sink_event (GstRTPBasePayload * payload,
GstEvent * event);
static gboolean gst_rtp_vp9_pay_set_caps (GstRTPBasePayload * payload,
GstCaps * caps);
G_DEFINE_TYPE (GstRtpVP9Pay, gst_rtp_vp9_pay, GST_TYPE_RTP_BASE_PAYLOAD);
static GstStaticPadTemplate gst_rtp_vp9_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) { \"VP9\", \"VP9-DRAFT-IETF-01\" }"));
static GstStaticPadTemplate gst_rtp_vp9_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-vp9"));
static void
gst_rtp_vp9_pay_init (GstRtpVP9Pay * obj)
{
obj->picture_id_mode = DEFAULT_PICTURE_ID_MODE;
if (obj->picture_id_mode == VP9_PAY_PICTURE_ID_7BITS)
obj->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
else if (obj->picture_id_mode == VP9_PAY_PICTURE_ID_15BITS)
obj->picture_id = g_random_int_range (0, G_MAXUINT16) & 0x7FFF;
}
static void
gst_rtp_vp9_pay_class_init (GstRtpVP9PayClass * gst_rtp_vp9_pay_class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (gst_rtp_vp9_pay_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (gst_rtp_vp9_pay_class);
GstRTPBasePayloadClass *pay_class =
GST_RTP_BASE_PAYLOAD_CLASS (gst_rtp_vp9_pay_class);
gobject_class->set_property = gst_rtp_vp9_pay_set_property;
gobject_class->get_property = gst_rtp_vp9_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_VP9_PAY_PICTURE_ID_MODE, DEFAULT_PICTURE_ID_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp9_pay_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_vp9_pay_src_template));
gst_element_class_set_static_metadata (element_class, "RTP VP9 payloader",
"Codec/Payloader/Network/RTP",
"Puts VP9 video in RTP packets)", "Stian Selnes <stian@pexip.com>");
pay_class->handle_buffer = gst_rtp_vp9_pay_handle_buffer;
pay_class->sink_event = gst_rtp_vp9_pay_sink_event;
pay_class->set_caps = gst_rtp_vp9_pay_set_caps;
GST_DEBUG_CATEGORY_INIT (gst_rtp_vp9_pay_debug, "rtpvp9pay", 0,
"VP9 Video RTP Payloader");
}
static void
gst_rtp_vp9_pay_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRtpVP9Pay *rtpvp9pay = GST_RTP_VP9_PAY (object);
switch (prop_id) {
case PROP_PICTURE_ID_MODE:
rtpvp9pay->picture_id_mode = g_value_get_enum (value);
if (rtpvp9pay->picture_id_mode == VP9_PAY_PICTURE_ID_7BITS)
rtpvp9pay->picture_id = g_random_int_range (0, G_MAXUINT8) & 0x7F;
else if (rtpvp9pay->picture_id_mode == VP9_PAY_PICTURE_ID_15BITS)