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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 "internal.h"
32 #include "rtp.h"
33 #include "rtpdec.h"
34 #include "rtpdec_formats.h"
35 
36 struct PayloadContext {
38  int64_t timestamp;
39 };
40 
41 /** return 0 on packet, <0 on partial packet or error... */
43  AVStream *st, AVPacket *pkt,
44  uint32_t *timestamp,
45  const uint8_t *buf, int len, uint16_t seq,
46  int flags)
47 {
48  int config_packet, start_packet, end_packet;
49 
50  if (len < 2)
51  return AVERROR_INVALIDDATA;
52 
53  config_packet = buf[0] & 0x40;
54  start_packet = buf[0] & 0x20;
55  end_packet = buf[0] & 0x10;
56  buf += 2; // ignore buf[1]
57  len -= 2;
58 
59  if (config_packet) {
60 
61  av_freep(&st->codec->extradata);
62  st->codec->extradata_size = 0;
63 
64  if (len < 2 || ff_alloc_extradata(st->codec, len + 8))
65  return AVERROR_INVALIDDATA;
66 
67  memcpy(st->codec->extradata, "SEQH", 4);
68  AV_WB32(st->codec->extradata + 4, len);
69  memcpy(st->codec->extradata + 8, buf, len);
70 
71  /* We set codec_id to AV_CODEC_ID_NONE initially to
72  * delay decoder initialization since extradata is
73  * carried within the RTP stream, not SDP. Here,
74  * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
75  * to the decoder that it is OK to initialize. */
77 
78  return AVERROR(EAGAIN);
79  }
80 
81  if (start_packet) {
82  int res;
83 
84  if (sv->pktbuf) {
85  uint8_t *tmp;
86  avio_close_dyn_buf(sv->pktbuf, &tmp);
87  av_free(tmp);
88  }
89  if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
90  return res;
91  sv->timestamp = *timestamp;
92  }
93 
94  if (!sv->pktbuf)
95  return AVERROR_INVALIDDATA;
96 
97  avio_write(sv->pktbuf, buf, len);
98 
99  if (end_packet) {
100  int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
101  if (ret < 0)
102  return ret;
103 
104  *timestamp = sv->timestamp;
105  return 0;
106  }
107 
108  return AVERROR(EAGAIN);
109 }
110 
112 {
113  return av_mallocz(sizeof(PayloadContext));
114 }
115 
117 {
118  if (sv->pktbuf) {
119  uint8_t *buf;
120  avio_close_dyn_buf(sv->pktbuf, &buf);
121  av_free(buf);
122  }
123  av_free(sv);
124 }
125 
127  .enc_name = "X-SV3V-ES",
128  .codec_type = AVMEDIA_TYPE_VIDEO,
129  .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
130  .alloc = svq3_extradata_new,
131  .free = svq3_extradata_free,
132  .parse_packet = svq3_parse_packet,
133 };