2 * Sorenson-3 (SVQ3/SV3V) payload for RTP
3 * Copyright (c) 2010 Ronald S. Bultje
5 * This file is part of FFmpeg.
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.
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.
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
24 * @brief RTP support for the SV3V (SVQ3) payload
25 * (http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization)
26 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
30 #include "libavutil/intreadwrite.h"
33 #include "rtpdec_svq3.h"
35 struct PayloadContext {
36 ByteIOContext *pktbuf;
41 /** return 0 on packet, <0 on partial packet or error... */
42 static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
43 AVStream *st, AVPacket *pkt,
45 const uint8_t *buf, int len, int flags)
47 int config_packet, start_packet, end_packet;
50 return AVERROR_INVALIDDATA;
52 config_packet = buf[0] & 0x40;
53 start_packet = buf[0] & 0x20;
54 end_packet = buf[0] & 0x10;
55 buf += 2; // ignore buf[1]
60 av_freep(&st->codec->extradata);
61 st->codec->extradata_size = 0;
63 if (len < 2 || !(st->codec->extradata =
64 av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
65 return AVERROR_INVALIDDATA;
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);
72 /* We set codec_id to 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 CODEC_ID_SVQ3, we are signalling
76 * to the decoder that it is OK to initialize. */
77 st->codec->codec_id = CODEC_ID_SVQ3;
79 return AVERROR(EAGAIN);
87 url_close_dyn_buf(sv->pktbuf, &tmp);
90 if ((res = url_open_dyn_buf(&sv->pktbuf)) < 0)
92 sv->timestamp = *timestamp;
93 sv->is_keyframe = flags & RTP_FLAG_KEY;
97 return AVERROR_INVALIDDATA;
99 put_buffer(sv->pktbuf, buf, len);
103 pkt->stream_index = st->index;
104 *timestamp = sv->timestamp;
105 pkt->flags = sv->is_keyframe ? AV_PKT_FLAG_KEY : 0;
106 pkt->size = url_close_dyn_buf(sv->pktbuf, &pkt->data);
107 pkt->destruct = av_destruct_packet;
112 return AVERROR(EAGAIN);
115 static PayloadContext *svq3_extradata_new(void)
117 return av_mallocz(sizeof(PayloadContext));
120 static void svq3_extradata_free(PayloadContext *sv)
124 url_close_dyn_buf(sv->pktbuf, &buf);
130 RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
133 CODEC_ID_NONE, // see if (config_packet) above
134 NULL, // parse sdp line