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