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rtpdec_svq3.c
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1 /*
2  * Sorenson-3 (SVQ3/SV3V) payload for RTP
3  * Copyright (c) 2010 Ronald S. Bultje
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * @brief RTP support for the SV3V (SVQ3) payload
25  * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
26  * @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
27  */
28 
29 #include <string.h>
30 #include "libavutil/intreadwrite.h"
31 #include "avio_internal.h"
32 #include "internal.h"
33 #include "rtp.h"
34 #include "rtpdec.h"
35 #include "rtpdec_formats.h"
36 
37 struct PayloadContext {
39  int64_t timestamp;
40 };
41 
42 /** return 0 on packet, <0 on partial packet or error... */
44  AVStream *st, AVPacket *pkt,
45  uint32_t *timestamp,
46  const uint8_t *buf, int len, uint16_t seq,
47  int flags)
48 {
49  int config_packet, start_packet, end_packet;
50 
51  if (len < 2)
52  return AVERROR_INVALIDDATA;
53 
54  config_packet = buf[0] & 0x40;
55  start_packet = buf[0] & 0x20;
56  end_packet = buf[0] & 0x10;
57  buf += 2; // ignore buf[1]
58  len -= 2;
59 
60  if (config_packet) {
61 
63  st->codecpar->extradata_size = 0;
64 
65  if (len < 2 || ff_alloc_extradata(st->codecpar, len + 8))
66  return AVERROR_INVALIDDATA;
67 
68  memcpy(st->codecpar->extradata, "SEQH", 4);
69  AV_WB32(st->codecpar->extradata + 4, len);
70  memcpy(st->codecpar->extradata + 8, buf, len);
71 
72  /* We set codec_id to AV_CODEC_ID_NONE initially to
73  * delay decoder initialization since extradata is
74  * carried within the RTP stream, not SDP. Here,
75  * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
76  * to the decoder that it is OK to initialize. */
78 
79  return AVERROR(EAGAIN);
80  }
81 
82  if (start_packet) {
83  int res;
84 
86  if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
87  return res;
88  sv->timestamp = *timestamp;
89  }
90 
91  if (!sv->pktbuf)
92  return AVERROR_INVALIDDATA;
93 
94  avio_write(sv->pktbuf, buf, len);
95 
96  if (end_packet) {
97  int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
98  if (ret < 0)
99  return ret;
100 
101  *timestamp = sv->timestamp;
102  return 0;
103  }
104 
105  return AVERROR(EAGAIN);
106 }
107 
109 {
111 }
112 
114  .enc_name = "X-SV3V-ES",
115  .codec_type = AVMEDIA_TYPE_VIDEO,
116  .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
117  .priv_data_size = sizeof(PayloadContext),
118  .close = svq3_close_context,
120 };
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:147
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int svq3_parse_packet(AVFormatContext *s, PayloadContext *sv, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags)
return 0 on packet, <0 on partial packet or error...
Definition: rtpdec_svq3.c:43
RTP/JPEG specific private data.
Definition: rdt.c:83
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3969
int index
stream index in AVFormatContext
Definition: avformat.h:882
static AVPacket pkt
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
Definition: aviobuf.c:1266
Format I/O context.
Definition: avformat.h:1330
uint8_t
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:204
uint32_t timestamp
current frame timestamp
Definition: rtpdec_ac3.c:31
#define AVERROR(e)
Definition: error.h:43
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3987
AVIOContext * pktbuf
Definition: rtpdec_asf.c:182
int64_t timestamp
Definition: rtpdec_svq3.c:39
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3165
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
Definition: aviobuf.c:1306
Stream structure.
Definition: avformat.h:881
static void svq3_close_context(PayloadContext *sv)
Definition: rtpdec_svq3.c:108
void * buf
Definition: avisynth_c.h:690
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
const char * enc_name
Definition: rtpdec.h:116
static int flags
Definition: cpu.c:47
RTPDynamicProtocolHandler ff_svq3_dynamic_handler
Definition: rtpdec_svq3.c:113
int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx)
Close the dynamic buffer and make a packet from it.
Definition: rtpdec.c:899
static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
Parse a packet, add all split parts to parse_queue.
Definition: utils.c:1368
int len
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3983
#define av_freep(p)
AVCodecParameters * codecpar
Definition: avformat.h:1233
This structure stores compressed data.
Definition: avcodec.h:1577