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gstreamer/gst/rtp/gstrtptheoradepay.c
Sebastian Dröge b1089fb520 rtp: Copy metadata in the (de)payloader, but only the relevant ones 
The payloader didn't copy anything so far, the depayloader copied every
possible meta. Let's make it consistent and just copy all metas without
tags or with only the video tag.

https://bugzilla.gnome.org/show_bug.cgi?id=751774
2015-08-11 12:47:23 +02:00

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/* GStreamer
* Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.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 <gst/tag/tag.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include <string.h>
#include "gstrtptheoradepay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (rtptheoradepay_debug);
#define GST_CAT_DEFAULT (rtptheoradepay_debug)
static GstStaticPadTemplate gst_rtp_theora_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"THEORA\""
/* All required parameters
*
* "sampling = (string) { "YCbCr-4:2:0", "YCbCr-4:2:2", "YCbCr-4:4:4" } "
* "width = (string) [1, 1048561] (multiples of 16) "
* "height = (string) [1, 1048561] (multiples of 16) "
* "delivery-method = (string) { inline, in_band, out_band/<specific_name> } "
* "configuration = (string) ANY"
*/
/* All optional parameters
*
* "configuration-uri ="
*/
)
);
static GstStaticPadTemplate gst_rtp_theora_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-theora")
);
#define gst_rtp_theora_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpTheoraDepay, gst_rtp_theora_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
static gboolean gst_rtp_theora_depay_setcaps (GstRTPBaseDepayload * depayload,
GstCaps * caps);
static GstBuffer *gst_rtp_theora_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
static gboolean gst_rtp_theora_depay_packet_lost (GstRTPBaseDepayload *
depayload, GstEvent * event);
static void gst_rtp_theora_depay_finalize (GObject * object);
static void
gst_rtp_theora_depay_class_init (GstRtpTheoraDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gobject_class->finalize = gst_rtp_theora_depay_finalize;
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_theora_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_theora_depay_setcaps;
gstrtpbasedepayload_class->packet_lost = gst_rtp_theora_depay_packet_lost;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_theora_depay_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_theora_depay_src_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP Theora depayloader", "Codec/Depayloader/Network/RTP",
"Extracts Theora video from RTP packets (draft-01 of RFC XXXX)",
"Wim Taymans <wim.taymans@gmail.com>");
GST_DEBUG_CATEGORY_INIT (rtptheoradepay_debug, "rtptheoradepay", 0,
"Theora RTP Depayloader");
}
static void
gst_rtp_theora_depay_init (GstRtpTheoraDepay * rtptheoradepay)
{
rtptheoradepay->adapter = gst_adapter_new ();
}
static void
gst_rtp_theora_depay_finalize (GObject * object)
{
GstRtpTheoraDepay *rtptheoradepay = GST_RTP_THEORA_DEPAY (object);
g_object_unref (rtptheoradepay->adapter);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rtp_theora_depay_parse_configuration (GstRtpTheoraDepay * rtptheoradepay,
GstBuffer * confbuf)
{
GstBuffer *buf;
guint32 num_headers;
GstMapInfo map;
guint8 *data;
gsize size;
gint i, j;
gst_buffer_map (confbuf, &map, GST_MAP_READ);
data = map.data;
size = map.size;
GST_DEBUG_OBJECT (rtptheoradepay, "config size %" G_GSIZE_FORMAT, size);
/* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Number of packed headers |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Packed header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Packed header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | .... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (size < 4)
goto too_small;
num_headers = GST_READ_UINT32_BE (data);
size -= 4;
data += 4;
GST_DEBUG_OBJECT (rtptheoradepay, "have %u headers", num_headers);
/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Ident | length ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. | n. of headers | length1 | length2 ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. | Identification Header ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .................................................................
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. | Comment Header ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .................................................................
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. Comment Header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Setup Header ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .................................................................
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. Setup Header |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
for (i = 0; i < num_headers; i++) {
guint32 ident;
guint16 length;
guint8 n_headers, b;
GstRtpTheoraConfig *conf;
guint *h_sizes;
guint extra = 1;
if (size < 6)
goto too_small;
ident = (data[0] << 16) | (data[1] << 8) | data[2];
length = (data[3] << 8) | data[4];
n_headers = data[5];
size -= 6;
data += 6;
GST_DEBUG_OBJECT (rtptheoradepay,
"header %d, ident 0x%08x, length %u, left %" G_GSIZE_FORMAT, i, ident,
length, size);
/* FIXME check if we already got this ident */
/* length might also include count of following size fields */
if (size < length && size + 1 != length)
goto too_small;
/* read header sizes we read 2 sizes, the third size (for which we allocate
* space) must be derived from the total packed header length. */
h_sizes = g_newa (guint, n_headers + 1);
for (j = 0; j < n_headers; j++) {
guint h_size;
h_size = 0;
do {
if (size < 1)
goto too_small;
b = *data++;
size--;
extra++;
h_size = (h_size << 7) | (b & 0x7f);
} while (b & 0x80);
GST_DEBUG_OBJECT (rtptheoradepay, "headers %d: size: %u", j, h_size);
h_sizes[j] = h_size;
length -= h_size;
}
/* last header length is the remaining space */
GST_DEBUG_OBJECT (rtptheoradepay, "last header size: %u", length);
h_sizes[j] = length;
GST_DEBUG_OBJECT (rtptheoradepay, "preparing headers");
conf = g_new0 (GstRtpTheoraConfig, 1);
conf->ident = ident;
for (j = 0; j <= n_headers; j++) {
guint h_size;
h_size = h_sizes[j];
if (size < h_size) {
if (j != n_headers || size + extra != h_size) {
goto too_small;
} else {
/* otherwise means that overall length field contained total length,
* including extra fields */
h_size -= extra;
}
}
GST_DEBUG_OBJECT (rtptheoradepay, "reading header %d, size %u", j,
h_size);
buf =
gst_buffer_copy_region (confbuf, GST_BUFFER_COPY_ALL, data - map.data,
h_size);
conf->headers = g_list_append (conf->headers, buf);
data += h_size;
size -= h_size;
}
rtptheoradepay->configs = g_list_append (rtptheoradepay->configs, conf);
}
gst_buffer_unmap (confbuf, &map);
return TRUE;
/* ERRORS */
too_small:
{
GST_DEBUG_OBJECT (rtptheoradepay, "configuration too small");
gst_buffer_unmap (confbuf, &map);
return FALSE;
}
}
static gboolean
gst_rtp_theora_depay_parse_inband_configuration (GstRtpTheoraDepay *
rtptheoradepay, guint ident, guint8 * configuration, guint size,
guint length)
{
GstBuffer *confbuf;
GstMapInfo map;
if (G_UNLIKELY (size < 4))
return FALSE;
/* transform inline to out-of-band and parse that one */
confbuf = gst_buffer_new_and_alloc (size + 9);
gst_buffer_map (confbuf, &map, GST_MAP_WRITE);
/* 1 header */
GST_WRITE_UINT32_BE (map.data, 1);
/* write Ident */
GST_WRITE_UINT24_BE (map.data + 4, ident);
/* write sort-of-length */
GST_WRITE_UINT16_BE (map.data + 7, length);
/* copy remainder */
memcpy (map.data + 9, configuration, size);
gst_buffer_unmap (confbuf, &map);
return gst_rtp_theora_depay_parse_configuration (rtptheoradepay, confbuf);
}
static gboolean
gst_rtp_theora_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
GstRtpTheoraDepay *rtptheoradepay;
GstCaps *srccaps;
const gchar *configuration;
gboolean res;
rtptheoradepay = GST_RTP_THEORA_DEPAY (depayload);
rtptheoradepay->needs_keyframe = FALSE;
structure = gst_caps_get_structure (caps, 0);
/* read and parse configuration string */
configuration = gst_structure_get_string (structure, "configuration");
if (configuration) {
GstBuffer *confbuf;
guint8 *data;
gsize size;
/* deserialize base64 to buffer */
data = g_base64_decode (configuration, &size);
confbuf = gst_buffer_new ();
gst_buffer_append_memory (confbuf,
gst_memory_new_wrapped (0, data, size, 0, size, data, g_free));
if (!gst_rtp_theora_depay_parse_configuration (rtptheoradepay, confbuf))
goto invalid_configuration;
}
/* set caps on pad and on header */
srccaps = gst_caps_new_empty_simple ("video/x-theora");
res = gst_pad_set_caps (depayload->srcpad, srccaps);
gst_caps_unref (srccaps);
/* Clock rate is always 90000 according to draft-barbato-avt-rtp-theora-01 */
depayload->clock_rate = 90000;
return res;
/* ERRORS */
invalid_configuration:
{
GST_ERROR_OBJECT (rtptheoradepay, "invalid configuration specified");
return FALSE;
}
}
static gboolean
gst_rtp_theora_depay_switch_codebook (GstRtpTheoraDepay * rtptheoradepay,
guint32 ident)
{
GList *walk;
gboolean res = FALSE;
for (walk = rtptheoradepay->configs; walk; walk = g_list_next (walk)) {
GstRtpTheoraConfig *conf = (GstRtpTheoraConfig *) walk->data;
if (conf->ident == ident) {
GList *headers;
/* FIXME, remove pads, create new pad.. */
/* push out all the headers */
for (headers = conf->headers; headers; headers = g_list_next (headers)) {
GstBuffer *header = GST_BUFFER_CAST (headers->data);
gst_buffer_ref (header);
gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtptheoradepay),
header);
}
/* remember the current config */
rtptheoradepay->config = conf;
res = TRUE;
}
}
if (!res) {
/* we don't know about the headers, figure out an alternative method for
* getting the codebooks. FIXME, fail for now. */
}
return res;
}
static GstBuffer *
gst_rtp_theora_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp)
{
GstRtpTheoraDepay *rtptheoradepay;
GstBuffer *outbuf;
GstFlowReturn ret;
gint payload_len;
GstMapInfo map;
GstBuffer *payload_buffer = NULL;
guint8 *payload;
guint32 header, ident;
guint8 F, TDT, packets;
guint length;
rtptheoradepay = GST_RTP_THEORA_DEPAY (depayload);
payload = gst_rtp_buffer_get_payload (rtp);
payload_len = gst_rtp_buffer_get_payload_len (rtp);
GST_DEBUG_OBJECT (depayload, "got RTP packet of size %d", payload_len);
/* we need at least 4 bytes for the packet header */
if (G_UNLIKELY (payload_len < 4))
goto packet_short;
payload = gst_rtp_buffer_get_payload (rtp);
header = GST_READ_UINT32_BE (payload);
/*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Ident | F |TDT|# pkts.|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* F: Fragment type (0=none, 1=start, 2=cont, 3=end)
* TDT: Theora data type (0=theora, 1=config, 2=comment, 3=reserved)
* pkts: number of packets.
*/
TDT = (header & 0x30) >> 4;
if (G_UNLIKELY (TDT == 3))
goto ignore_reserved;
ident = (header >> 8) & 0xffffff;
F = (header & 0xc0) >> 6;
packets = (header & 0xf);
GST_DEBUG_OBJECT (depayload, "ident: 0x%08x, F: %d, TDT: %d, packets: %d",
ident, F, TDT, packets);
if (TDT == 0) {
gboolean do_switch = FALSE;
/* we have a raw payload, find the codebook for the ident */
if (!rtptheoradepay->config) {
/* we don't have an active codebook, find the codebook and
* activate it */
do_switch = TRUE;
} else if (rtptheoradepay->config->ident != ident) {
/* codebook changed */
do_switch = TRUE;
}
if (do_switch) {
if (!gst_rtp_theora_depay_switch_codebook (rtptheoradepay, ident))
goto switch_failed;
}
}
/* fragmented packets, assemble */
if (F != 0) {
GstBuffer *vdata;
guint headerskip;
if (F == 1) {
/* if we start a packet, clear adapter and start assembling. */
gst_adapter_clear (rtptheoradepay->adapter);
GST_DEBUG_OBJECT (depayload, "start assemble");
rtptheoradepay->assembling = TRUE;
}
if (!rtptheoradepay->assembling)
goto no_output;
/* first assembled packet, reuse 2 bytes to store the length */
headerskip = (F == 1 ? 4 : 6);
/* skip header and length. */
vdata = gst_rtp_buffer_get_payload_subbuffer (rtp, headerskip, -1);
GST_DEBUG_OBJECT (depayload, "assemble theora packet");
gst_adapter_push (rtptheoradepay->adapter, vdata);
/* packet is not complete, we are done */
if (F != 3)
goto no_output;
/* construct assembled buffer */
payload_buffer =
gst_adapter_take_buffer (rtptheoradepay->adapter, payload_len);
} else {
payload_buffer = gst_rtp_buffer_get_payload_subbuffer (rtp, 4, -1);
}
GST_DEBUG_OBJECT (depayload, "assemble done, payload_len %d", payload_len);
gst_buffer_map (payload_buffer, &map, GST_MAP_READ);
payload = map.data;
payload_len = map.size;
/* we not assembling anymore now */
rtptheoradepay->assembling = FALSE;
gst_adapter_clear (rtptheoradepay->adapter);
/* payload now points to a length with that many theora data bytes.
* Iterate over the packets and send them out.
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | length | theora data ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. theora data |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | length | next theora packet data ..
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* .. theora data |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*
*/
while (payload_len >= 2) {
payload += 2;
payload_len -= 2;
GST_DEBUG_OBJECT (depayload, "read length %u, avail: %d", length,
payload_len);
/* skip packet if something odd happens */
if (G_UNLIKELY (length > payload_len))
goto length_short;
/* handle in-band configuration */
if (G_UNLIKELY (TDT == 1)) {
GST_DEBUG_OBJECT (rtptheoradepay, "in-band configuration");
if (!gst_rtp_theora_depay_parse_inband_configuration (rtptheoradepay,
ident, payload, payload_len, length))
goto invalid_configuration;
goto no_output;
}
/* create buffer for packet */
outbuf =
gst_buffer_copy_region (payload_buffer, GST_BUFFER_COPY_ALL,
payload - map.data, length);
if (payload_len > 0 && (payload[0] & 0xC0) == 0x0) {
rtptheoradepay->needs_keyframe = FALSE;
} else {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
payload += length;
payload_len -= length;
/* make sure to read next length */
length = 0;
ret = gst_rtp_base_depayload_push (depayload, outbuf);
if (ret != GST_FLOW_OK)
break;
}
if (rtptheoradepay->needs_keyframe)
goto request_keyframe;
out:
no_output:
if (payload_buffer) {
gst_buffer_unmap (payload_buffer, &map);
gst_buffer_unref (payload_buffer);
}
return NULL;
/* ERORRS */
switch_failed:
{
GST_ELEMENT_WARNING (rtptheoradepay, STREAM, DECODE,
(NULL), ("Could not switch codebooks"));
goto request_config;
}
packet_short:
{
GST_ELEMENT_WARNING (rtptheoradepay, STREAM, DECODE,
(NULL), ("Packet was too short (%d < 4)", payload_len));
goto request_keyframe;
}
ignore_reserved:
{
GST_WARNING_OBJECT (rtptheoradepay, "reserved TDT ignored");
goto out;
}
length_short:
{
GST_ELEMENT_WARNING (rtptheoradepay, STREAM, DECODE,
(NULL), ("Packet contains invalid data"));
goto request_keyframe;
}
invalid_configuration:
{
/* fatal, as we otherwise risk carrying on without output */
GST_ELEMENT_ERROR (rtptheoradepay, STREAM, DECODE,
(NULL), ("Packet contains invalid configuration"));
goto request_config;
}
request_config:
{
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
gst_structure_new ("GstForceKeyUnit",
"all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
goto out;
}
request_keyframe:
{
rtptheoradepay->needs_keyframe = TRUE;
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
gst_structure_new_empty ("GstForceKeyUnit")));
goto out;
}
}
gboolean
gst_rtp_theora_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtptheoradepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_THEORA_DEPAY);
}
static gboolean
gst_rtp_theora_depay_packet_lost (GstRTPBaseDepayload * depayload,
GstEvent * event)
{
GstRtpTheoraDepay *rtptheoradepay = GST_RTP_THEORA_DEPAY (depayload);
guint seqnum = 0;
gst_structure_get_uint (gst_event_get_structure (event), "seqnum", &seqnum);
GST_LOG_OBJECT (depayload, "Requested keyframe because frame with seqnum %u"
" is missing", seqnum);
rtptheoradepay->needs_keyframe = TRUE;
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
gst_structure_new_empty ("GstForceKeyUnit")));
return TRUE;
}
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