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/*
* RTP iLBC Depacketizer, RFC 3952
* Copyright (c) 2012 Martin Storsjo
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "rtpdec_formats.h"
#include "libavutil/avstring.h"
static int ilbc_parse_fmtp(AVStream *stream, PayloadContext *data,
char *attr, char *value)
{
if (!strcmp(attr, "mode")) {
int mode = atoi(value);
switch (mode) {
case 20:
stream->codec->block_align = 38;
break;
case 30:
stream->codec->block_align = 50;
break;
default:
av_log(NULL, AV_LOG_ERROR, "Unsupported iLBC mode %d\n", mode);
return AVERROR(EINVAL);
}
}
return 0;
}
static int ilbc_parse_sdp_line(AVFormatContext *s, int st_index,
PayloadContext *data, const char *line)
{
const char *p;
AVStream *st;
if (st_index < 0)
return 0;
st = s->streams[st_index];
if (av_strstart(line, "fmtp:", &p)) {
int ret = ff_parse_fmtp(st, data, p, ilbc_parse_fmtp);
if (ret < 0)
return ret;
if (!st->codec->block_align) {
av_log(s, AV_LOG_ERROR, "No iLBC mode set\n");
return AVERROR(EINVAL);
}
}
return 0;
}
RTPDynamicProtocolHandler ff_ilbc_dynamic_handler = {
.enc_name = "iLBC",
.codec_type = AVMEDIA_TYPE_AUDIO,
.codec_id = AV_CODEC_ID_ILBC,
.parse_sdp_a_line = ilbc_parse_sdp_line,
};
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