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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 "rtp.h"
32 #include "rtpdec.h"
33 #include "rtpdec_formats.h"
34 
35 struct PayloadContext {
37  int64_t timestamp;
38 };
39 
40 /** return 0 on packet, <0 on partial packet or error... */
42  AVStream *st, AVPacket *pkt,
43  uint32_t *timestamp,
44  const uint8_t *buf, int len, uint16_t seq,
45  int flags)
46 {
47  int config_packet, start_packet, end_packet;
48 
49  if (len < 2)
50  return AVERROR_INVALIDDATA;
51 
52  config_packet = buf[0] & 0x40;
53  start_packet = buf[0] & 0x20;
54  end_packet = buf[0] & 0x10;
55  buf += 2; // ignore buf[1]
56  len -= 2;
57 
58  if (config_packet) {
59 
60  av_freep(&st->codec->extradata);
61  st->codec->extradata_size = 0;
62 
63  if (len < 2 || !(st->codec->extradata =
65  return AVERROR_INVALIDDATA;
66 
67  st->codec->extradata_size = len + 8;
68  memcpy(st->codec->extradata, "SEQH", 4);
69  AV_WB32(st->codec->extradata + 4, len);
70  memcpy(st->codec->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 
85  if (sv->pktbuf) {
86  uint8_t *tmp;
87  avio_close_dyn_buf(sv->pktbuf, &tmp);
88  av_free(tmp);
89  }
90  if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
91  return res;
92  sv->timestamp = *timestamp;
93  }
94 
95  if (!sv->pktbuf)
96  return AVERROR_INVALIDDATA;
97 
98  avio_write(sv->pktbuf, buf, len);
99 
100  if (end_packet) {
101  int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
102  if (ret < 0)
103  return ret;
104 
105  *timestamp = sv->timestamp;
106  return 0;
107  }
108 
109  return AVERROR(EAGAIN);
110 }
111 
113 {
114  return av_mallocz(sizeof(PayloadContext));
115 }
116 
118 {
119  if (sv->pktbuf) {
120  uint8_t *buf;
121  avio_close_dyn_buf(sv->pktbuf, &buf);
122  av_free(buf);
123  }
124  av_free(sv);
125 }
126 
128  .enc_name = "X-SV3V-ES",
129  .codec_type = AVMEDIA_TYPE_VIDEO,
130  .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
131  .alloc = svq3_extradata_new,
132  .free = svq3_extradata_free,
133  .parse_packet = svq3_parse_packet,
134 };