74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
|
|
* RTP iLBC Depacketizer, RFC 3952
|
|
* Copyright (c) 2012 Martin Storsjo
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; 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,
|
|
};
|