2 * Sorenson-3 (SVQ3/SV3V) payload for RTP
3 * Copyright (c) 2010 Ronald S. Bultje
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
26 * @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
30 #include "libavutil/intreadwrite.h"
31 #include "avio_internal.h"
34 #include "rtpdec_formats.h"
36 struct PayloadContext {
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, uint16_t seq,
48 int config_packet, start_packet, end_packet;
51 return AVERROR_INVALIDDATA;
53 config_packet = buf[0] & 0x40;
54 start_packet = buf[0] & 0x20;
55 end_packet = buf[0] & 0x10;
56 buf += 2; // ignore buf[1]
61 av_freep(&st->codec->extradata);
62 st->codec->extradata_size = 0;
64 if (len < 2 || !(st->codec->extradata =
65 av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
66 return AVERROR_INVALIDDATA;
68 st->codec->extradata_size = len + 8;
69 memcpy(st->codec->extradata, "SEQH", 4);
70 AV_WB32(st->codec->extradata + 4, len);
71 memcpy(st->codec->extradata + 8, buf, len);
73 /* We set codec_id to AV_CODEC_ID_NONE initially to
74 * delay decoder initialization since extradata is
75 * carried within the RTP stream, not SDP. Here,
76 * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
77 * to the decoder that it is OK to initialize. */
78 st->codec->codec_id = AV_CODEC_ID_SVQ3;
80 return AVERROR(EAGAIN);
86 ffio_free_dyn_buf(&sv->pktbuf);
87 if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
89 sv->timestamp = *timestamp;
93 return AVERROR_INVALIDDATA;
95 avio_write(sv->pktbuf, buf, len);
98 int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
102 *timestamp = sv->timestamp;
106 return AVERROR(EAGAIN);
109 static void svq3_extradata_free(PayloadContext *sv)
111 ffio_free_dyn_buf(&sv->pktbuf);
114 RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
115 .enc_name = "X-SV3V-ES",
116 .codec_type = AVMEDIA_TYPE_VIDEO,
117 .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above
118 .priv_data_size = sizeof(PayloadContext),
119 .free = svq3_extradata_free,
120 .parse_packet = svq3_parse_packet,