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gstreamer/gst/isomp4/gstrtpxqtdepay.c

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/* GStreamer
* Copyright (C) <2006> Wim Taymans <wim@fluendo.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* based on http://developer.apple.com/quicktime/icefloe/dispatch026.html
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/rtp/gstrtpbuffer.h>
#include <string.h>
#include "gstrtpxqtdepay.h"
#define MAKE_TLV(a,b) (((a)<<8)|(b))
#define TLV_sd MAKE_TLV ('s','d')
#define TLV_qt MAKE_TLV ('q','t')
#define TLV_ti MAKE_TLV ('t','i')
#define TLV_ly MAKE_TLV ('l','y')
#define TLV_vo MAKE_TLV ('v','o')
#define TLV_mx MAKE_TLV ('m','x')
#define TLV_tr MAKE_TLV ('t','r')
#define TLV_tw MAKE_TLV ('t','w')
#define TLV_th MAKE_TLV ('t','h')
#define TLV_la MAKE_TLV ('l','a')
#define TLV_rt MAKE_TLV ('r','t')
#define TLV_gm MAKE_TLV ('g','m')
#define TLV_oc MAKE_TLV ('o','c')
#define TLV_cr MAKE_TLV ('c','r')
#define TLV_du MAKE_TLV ('d','u')
#define TLV_po MAKE_TLV ('p','o')
#define QT_UINT32(a) (GST_READ_UINT32_BE(a))
#define QT_UINT24(a) (GST_READ_UINT32_BE(a) >> 8)
#define QT_UINT16(a) (GST_READ_UINT16_BE(a))
#define QT_UINT8(a) (GST_READ_UINT8(a))
#define QT_FP32(a) ((GST_READ_UINT32_BE(a))/65536.0)
#define QT_FP16(a) ((GST_READ_UINT16_BE(a))/256.0)
#define QT_FOURCC(a) (GST_READ_UINT32_LE(a))
#define QT_UINT64(a) ((((guint64)QT_UINT32(a))<<32)|QT_UINT32(((guint8 *)a)+4))
#define FOURCC_avc1 GST_MAKE_FOURCC('a','v','c','1')
#define FOURCC_avcC GST_MAKE_FOURCC('a','v','c','C')
GST_DEBUG_CATEGORY_STATIC (rtpxqtdepay_debug);
#define GST_CAT_DEFAULT (rtpxqtdepay_debug)
/* RtpXQTDepay signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
};
static GstStaticPadTemplate gst_rtp_xqt_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_rtp_xqt_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
"media = (string) { \"audio\", \"video\" }, clock-rate = (int) [1, MAX], "
"encoding-name = (string) { \"X-QT\", \"X-QUICKTIME\" }")
);
GST_BOILERPLATE (GstRtpXQTDepay, gst_rtp_xqt_depay, GstBaseRTPDepayload,
GST_TYPE_BASE_RTP_DEPAYLOAD);
static void gst_rtp_xqt_depay_finalize (GObject * object);
static gboolean gst_rtp_xqt_depay_setcaps (GstBaseRTPDepayload * depayload,
GstCaps * caps);
static GstBuffer *gst_rtp_xqt_depay_process (GstBaseRTPDepayload * depayload,
GstBuffer * buf);
static GstStateChangeReturn gst_rtp_xqt_depay_change_state (GstElement *
element, GstStateChange transition);
static void
gst_rtp_xqt_depay_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_static_pad_template (element_class,
&gst_rtp_xqt_depay_src_template);
gst_element_class_add_static_pad_template (element_class,
&gst_rtp_xqt_depay_sink_template);
gst_element_class_set_details_simple (element_class, "RTP packet depayloader",
"Codec/Depayloader/Network",
"Extracts Quicktime audio/video from RTP packets",
"Wim Taymans <wim@fluendo.com>");
}
static void
gst_rtp_xqt_depay_class_init (GstRtpXQTDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_rtp_xqt_depay_finalize;
gstelement_class->change_state = gst_rtp_xqt_depay_change_state;
gstbasertpdepayload_class->set_caps = gst_rtp_xqt_depay_setcaps;
gstbasertpdepayload_class->process = gst_rtp_xqt_depay_process;
GST_DEBUG_CATEGORY_INIT (rtpxqtdepay_debug, "rtpxqtdepay", 0,
"QT Media RTP Depayloader");
}
static void
gst_rtp_xqt_depay_init (GstRtpXQTDepay * rtpxqtdepay,
GstRtpXQTDepayClass * klass)
{
rtpxqtdepay->adapter = gst_adapter_new ();
}
static void
gst_rtp_xqt_depay_finalize (GObject * object)
{
GstRtpXQTDepay *rtpxqtdepay;
rtpxqtdepay = GST_RTP_XQT_DEPAY (object);
g_object_unref (rtpxqtdepay->adapter);
rtpxqtdepay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rtp_quicktime_parse_sd (GstRtpXQTDepay * rtpxqtdepay, guint8 * data,
guint data_len)
{
gint len;
guint32 fourcc;
if (data_len < 8)
goto too_short;
len = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
if (len > data_len)
goto too_short;
fourcc = QT_FOURCC (data + 4);
GST_DEBUG_OBJECT (rtpxqtdepay, "parsing %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fourcc));
switch (fourcc) {
case FOURCC_avc1:
{
guint32 chlen;
if (len < 0x56)
goto too_short;
len -= 0x56;
data += 0x56;
/* find avcC */
while (len >= 8) {
chlen = QT_UINT32 (data);
fourcc = QT_FOURCC (data + 4);
if (fourcc == FOURCC_avcC) {
GstBuffer *buf;
gint size;
GstCaps *caps;
GST_DEBUG_OBJECT (rtpxqtdepay, "found avcC codec_data in sd, %u",
chlen);
/* parse, if found */
if (chlen < len)
size = chlen - 8;
else
size = len - 8;
buf = gst_buffer_new_and_alloc (size);
memcpy (GST_BUFFER_DATA (buf), data + 8, size);
caps = gst_caps_new_simple ("video/x-h264",
"codec_data", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_unref (buf);
gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD (rtpxqtdepay)->srcpad, caps);
gst_caps_unref (caps);
break;
}
len -= chlen;
data += chlen;
}
break;
}
default:
break;
}
return TRUE;
/* ERRORS */
too_short:
{
return FALSE;
}
}
static gboolean
gst_rtp_xqt_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
gint clock_rate = 90000; /* default */
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "clock-rate", &clock_rate);
depayload->clock_rate = clock_rate;
return TRUE;
}
static GstBuffer *
gst_rtp_xqt_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
{
GstRtpXQTDepay *rtpxqtdepay;
GstBuffer *outbuf;
gboolean m;
rtpxqtdepay = GST_RTP_XQT_DEPAY (depayload);
if (!gst_rtp_buffer_validate (buf))
goto bad_packet;
if (GST_BUFFER_IS_DISCONT (buf)) {
/* discont, clear adapter and try to find a new packet start */
gst_adapter_clear (rtpxqtdepay->adapter);
rtpxqtdepay->need_resync = TRUE;
GST_DEBUG_OBJECT (rtpxqtdepay, "we need resync");
}
m = gst_rtp_buffer_get_marker (buf);
GST_LOG_OBJECT (rtpxqtdepay, "marker: %d", m);
{
gint payload_len;
guint avail;
guint8 *payload;
guint8 ver, pck;
gboolean s, q, l, d;
payload_len = gst_rtp_buffer_get_payload_len (buf);
payload = gst_rtp_buffer_get_payload (buf);
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | VER |PCK|S|Q|L| RES |D| QuickTime Payload ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (payload_len <= 4)
goto wrong_length;
ver = (payload[0] & 0xf0) >> 4;
if (ver > 1)
goto wrong_version;
pck = (payload[0] & 0x0c) >> 2;
if (pck == 0)
goto pck_reserved;
s = (payload[0] & 0x02) != 0; /* contains sync sample */
q = (payload[0] & 0x01) != 0; /* has payload description */
l = (payload[1] & 0x80) != 0; /* has packet specific information description */
d = (payload[2] & 0x80) != 0; /* don't cache info for payload id */
/* id used for caching info */
rtpxqtdepay->current_id = ((payload[2] & 0x7f) << 8) | payload[3];
GST_LOG_OBJECT (rtpxqtdepay,
"VER: %d, PCK: %d, S: %d, Q: %d, L: %d, D: %d, ID: %d", ver, pck, s, q,
l, d, rtpxqtdepay->current_id);
if (rtpxqtdepay->need_resync) {
/* we need to find the boundary of a new packet after a DISCONT */
if (pck != 3 || q) {
/* non-fragmented packet or payload description present, packet starts
* here. */
rtpxqtdepay->need_resync = FALSE;
} else {
/* fragmented packet without description */
if (m) {
/* marker bit set, next packet is start of new one */
rtpxqtdepay->need_resync = FALSE;
}
goto need_resync;
}
}
payload += 4;
payload_len -= 4;
if (q) {
gboolean k, f, a, z;
guint pdlen, pdpadded;
gint padding;
/* media_type only used for printing */
guint32 G_GNUC_UNUSED media_type;
guint32 timescale;
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |K|F|A|Z| RES | QuickTime Payload Desc Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . QuickTime Payload Desc Data ... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (payload_len <= 4)
goto wrong_length;
k = (payload[0] & 0x80) != 0; /* keyframe */
f = (payload[0] & 0x40) != 0; /* sparse */
a = (payload[0] & 0x20) != 0; /* start of payload */
z = (payload[0] & 0x10) != 0; /* end of payload */
pdlen = (payload[2] << 8) | payload[3];
if (pdlen < 12)
goto wrong_length;
/* calc padding */
pdpadded = pdlen + 3;
pdpadded -= pdpadded % 4;
if (payload_len < pdpadded)
goto wrong_length;
padding = pdpadded - pdlen;
GST_LOG_OBJECT (rtpxqtdepay,
"K: %d, F: %d, A: %d, Z: %d, len: %d, padding %d", k, f, a, z, pdlen,
padding);
payload += 4;
payload_len -= 4;
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | QuickTime Media Type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Timescale |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . QuickTime TLVs ... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
media_type =
(payload[0] << 24) | (payload[1] << 16) | (payload[2] << 8) |
payload[3];
timescale =
(payload[4] << 24) | (payload[5] << 16) | (payload[6] << 8) |
payload[7];
GST_LOG_OBJECT (rtpxqtdepay, "media_type: %c%c%c%c, timescale %u",
payload[0], payload[1], payload[2], payload[3], timescale);
payload += 8;
payload_len -= 8;
pdlen -= 12;
/* parse TLV (type-length-value triplets */
while (pdlen > 3) {
guint16 tlv_len, tlv_type;
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | QuickTime TLV Length | QuickTime TLV Type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . QuickTime TLV Value ... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
tlv_len = (payload[0] << 8) | payload[1];
tlv_type = (payload[2] << 8) | payload[3];
pdlen -= 4;
if (tlv_len > pdlen)
goto wrong_length;
GST_LOG_OBJECT (rtpxqtdepay, "TLV '%c%c', len %d", payload[2],
payload[3], tlv_len);
payload += 4;
payload_len -= 4;
switch (tlv_type) {
case TLV_sd:
/* Session description */
if (!gst_rtp_quicktime_parse_sd (rtpxqtdepay, payload, tlv_len))
goto unknown_format;
rtpxqtdepay->have_sd = TRUE;
break;
case TLV_qt:
case TLV_ti:
case TLV_ly:
case TLV_vo:
case TLV_mx:
case TLV_tr:
case TLV_tw:
case TLV_th:
case TLV_la:
case TLV_rt:
case TLV_gm:
case TLV_oc:
case TLV_cr:
case TLV_du:
case TLV_po:
default:
break;
}
pdlen -= tlv_len;
payload += tlv_len;
payload_len -= tlv_len;
}
payload += padding;
payload_len -= padding;
}
if (l) {
guint ssilen, ssipadded;
gint padding;
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | RES | Sample-Specific Info Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . QuickTime TLVs ...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if (payload_len <= 4)
goto wrong_length;
ssilen = (payload[2] << 8) | payload[3];
if (ssilen < 4)
goto wrong_length;
/* calc padding */
ssipadded = ssilen + 3;
ssipadded -= ssipadded % 4;
if (payload_len < ssipadded)
goto wrong_length;
padding = ssipadded - ssilen;
GST_LOG_OBJECT (rtpxqtdepay, "len: %d, padding %d", ssilen, padding);
payload += 4;
payload_len -= 4;
ssilen -= 4;
/* parse TLV (type-length-value triplets */
while (ssilen > 3) {
guint16 tlv_len, tlv_type;
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | QuickTime TLV Length | QuickTime TLV Type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . QuickTime TLV Value ... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
tlv_len = (payload[0] << 8) | payload[1];
tlv_type = (payload[2] << 8) | payload[3];
ssilen -= 4;
if (tlv_len > ssilen)
goto wrong_length;
GST_LOG_OBJECT (rtpxqtdepay, "TLV '%c%c', len %d", payload[2],
payload[3], tlv_len);
payload += 4;
payload_len -= 4;
switch (tlv_type) {
case TLV_sd:
case TLV_qt:
case TLV_ti:
case TLV_ly:
case TLV_vo:
case TLV_mx:
case TLV_tr:
case TLV_tw:
case TLV_th:
case TLV_la:
case TLV_rt:
case TLV_gm:
case TLV_oc:
case TLV_cr:
case TLV_du:
case TLV_po:
default:
break;
}
ssilen -= tlv_len;
payload += tlv_len;
payload_len -= tlv_len;
}
payload += padding;
payload_len -= padding;
}
rtpxqtdepay->previous_id = rtpxqtdepay->current_id;
switch (pck) {
case 1:
{
/* multiple samples per packet. */
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
return outbuf;
}
case 2:
{
guint slen;
/* multiple samples per packet.
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |S| Reserved | Sample Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Sample Timestamp |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . Sample Data ... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |S| Reserved | Sample Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Sample Timestamp |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . Sample Data ... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* . ...... .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
while (payload_len > 8) {
s = (payload[0] & 0x80) != 0; /* contains sync sample */
slen = (payload[2] << 8) | payload[3];
/* timestamp =
* (payload[4] << 24) | (payload[5] << 16) | (payload[6] << 8) |
* payload[7];
*/
payload += 8;
payload_len -= 8;
if (slen > payload_len)
slen = payload_len;
outbuf = gst_buffer_new_and_alloc (slen);
memcpy (GST_BUFFER_DATA (outbuf), payload, slen);
if (!s)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
gst_base_rtp_depayload_push (depayload, outbuf);
/* aligned on 32 bit boundary */
slen = GST_ROUND_UP_4 (slen);
payload += slen;
payload_len -= slen;
}
break;
}
case 3:
{
/* one sample per packet, use adapter to combine based on marker bit. */
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
gst_adapter_push (rtpxqtdepay->adapter, outbuf);
if (!m)
goto done;
avail = gst_adapter_available (rtpxqtdepay->adapter);
outbuf = gst_adapter_take_buffer (rtpxqtdepay->adapter, avail);
GST_DEBUG_OBJECT (rtpxqtdepay,
"gst_rtp_xqt_depay_chain: pushing buffer of size %u", avail);
return outbuf;
}
}
}
done:
return NULL;
bad_packet:
{
GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
("Packet did not validate."), (NULL));
return NULL;
}
need_resync:
{
GST_DEBUG_OBJECT (rtpxqtdepay, "waiting for marker");
return NULL;
}
wrong_version:
{
GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
("Unknown payload version."), (NULL));
return NULL;
}
pck_reserved:
{
GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
("PCK reserved 0."), (NULL));
return NULL;
}
wrong_length:
{
GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
("Wrong payload length."), (NULL));
return NULL;
}
unknown_format:
{
GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
("Unknown payload format."), (NULL));
return NULL;
}
}
static GstStateChangeReturn
gst_rtp_xqt_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpXQTDepay *rtpxqtdepay;
GstStateChangeReturn ret;
rtpxqtdepay = GST_RTP_XQT_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (rtpxqtdepay->adapter);
rtpxqtdepay->previous_id = -1;
rtpxqtdepay->current_id = -1;
rtpxqtdepay->need_resync = TRUE;
rtpxqtdepay->have_sd = FALSE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_adapter_clear (rtpxqtdepay->adapter);
default:
break;
}
return ret;
}
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