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libavformat
rtpdec_svq3.c
Go to the documentation of this file.
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/*
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* Sorenson-3 (SVQ3/SV3V) payload for RTP
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* Copyright (c) 2010 Ronald S. Bultje
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief RTP support for the SV3V (SVQ3) payload
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* @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
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*/
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#include <string.h>
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#include "
libavutil/intreadwrite.h
"
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#include "
avio_internal.h
"
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#include "
internal.h
"
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#include "
rtp.h
"
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#include "
rtpdec.h
"
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#include "
rtpdec_formats.h
"
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struct
PayloadContext
{
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AVIOContext
*
pktbuf
;
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int64_t
timestamp
;
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};
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/** return 0 on packet, <0 on partial packet or error... */
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static
int
svq3_parse_packet
(
AVFormatContext
*
s
,
PayloadContext
*sv,
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AVStream
*st,
AVPacket
*
pkt
,
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uint32_t *timestamp,
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const
uint8_t
*
buf
,
int
len
, uint16_t seq,
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int
flags
)
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{
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int
config_packet, start_packet, end_packet;
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if
(len < 2)
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return
AVERROR_INVALIDDATA
;
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config_packet = buf[0] & 0x40;
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start_packet = buf[0] & 0x20;
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end_packet = buf[0] & 0x10;
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buf += 2;
// ignore buf[1]
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len -= 2;
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if
(config_packet) {
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av_freep
(&st->
codec
->
extradata
);
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st->
codec
->
extradata_size
= 0;
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if
(len < 2 ||
ff_alloc_extradata
(st->
codec
, len + 8))
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return
AVERROR_INVALIDDATA
;
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memcpy(st->
codec
->
extradata
,
"SEQH"
, 4);
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AV_WB32
(st->
codec
->
extradata
+ 4, len);
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memcpy(st->
codec
->
extradata
+ 8, buf, len);
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/* We set codec_id to AV_CODEC_ID_NONE initially to
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* delay decoder initialization since extradata is
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* carried within the RTP stream, not SDP. Here,
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* by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
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* to the decoder that it is OK to initialize. */
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st->
codec
->
codec_id
=
AV_CODEC_ID_SVQ3
;
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return
AVERROR
(EAGAIN);
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}
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if
(start_packet) {
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int
res;
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ffio_free_dyn_buf
(&sv->
pktbuf
);
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if
((res =
avio_open_dyn_buf
(&sv->
pktbuf
)) < 0)
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return
res;
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sv->
timestamp
= *timestamp;
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}
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if
(!sv->
pktbuf
)
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return
AVERROR_INVALIDDATA
;
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avio_write
(sv->
pktbuf
, buf, len);
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if
(end_packet) {
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int
ret
=
ff_rtp_finalize_packet
(pkt, &sv->
pktbuf
, st->
index
);
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if
(ret < 0)
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return
ret
;
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*timestamp = sv->
timestamp
;
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return
0;
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}
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return
AVERROR
(EAGAIN);
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}
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static
void
svq3_close_context
(
PayloadContext
*sv)
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{
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ffio_free_dyn_buf
(&sv->
pktbuf
);
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}
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RTPDynamicProtocolHandler
ff_svq3_dynamic_handler
= {
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.
enc_name
=
"X-SV3V-ES"
,
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.codec_type =
AVMEDIA_TYPE_VIDEO
,
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.codec_id =
AV_CODEC_ID_NONE
,
// see if (config_packet) above
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.priv_data_size =
sizeof
(
PayloadContext
),
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.close =
svq3_close_context
,
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.
parse_packet
=
svq3_parse_packet
,
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};
Generated on Sun Mar 8 2015 02:35:12 for FFmpeg by
1.8.2