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 {
38 AVIOContext *pktbuf;
39 int64_t timestamp;
40 };
41
42 /** return 0 on packet, <0 on partial packet or error... */
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)43 static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
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 if (len < 2 || ff_alloc_extradata(st->codecpar, len + 8))
62 return AVERROR_INVALIDDATA;
63
64 memcpy(st->codecpar->extradata, "SEQH", 4);
65 AV_WB32(st->codecpar->extradata + 4, len);
66 memcpy(st->codecpar->extradata + 8, buf, len);
67
68 /* We set codec_id to AV_CODEC_ID_NONE initially to
69 * delay decoder initialization since extradata is
70 * carried within the RTP stream, not SDP. Here,
71 * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
72 * to the decoder that it is OK to initialize. */
73 st->codecpar->codec_id = AV_CODEC_ID_SVQ3;
74
75 return AVERROR(EAGAIN);
76 }
77
78 if (start_packet) {
79 int res;
80
81 ffio_free_dyn_buf(&sv->pktbuf);
82 if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
83 return res;
84 sv->timestamp = *timestamp;
85 }
86
87 if (!sv->pktbuf)
88 return AVERROR_INVALIDDATA;
89
90 avio_write(sv->pktbuf, buf, len);
91
92 if (end_packet) {
93 int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
94 if (ret < 0)
95 return ret;
96
97 *timestamp = sv->timestamp;
98 return 0;
99 }
100
101 return AVERROR(EAGAIN);
102 }
103
svq3_close_context(PayloadContext * sv)104 static void svq3_close_context(PayloadContext *sv)
105 {
106 ffio_free_dyn_buf(&sv->pktbuf);
107 }
108
109 const RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
110 .enc_name = "X-SV3V-ES",
111 .codec_type = AVMEDIA_TYPE_VIDEO,
112 .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
113 .priv_data_size = sizeof(PayloadContext),
114 .close = svq3_close_context,
115 .parse_packet = svq3_parse_packet,
116 };
117