| 1 | /* |
| 2 | * RTP iLBC Depacketizer, RFC 3952 |
| 3 | * Copyright (c) 2012 Martin Storsjo |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | #include "avformat.h" |
| 23 | #include "rtpdec_formats.h" |
| 24 | #include "libavutil/avstring.h" |
| 25 | |
| 26 | static int ilbc_parse_fmtp(AVFormatContext *s, |
| 27 | AVStream *stream, PayloadContext *data, |
| 28 | char *attr, char *value) |
| 29 | { |
| 30 | if (!strcmp(attr, "mode")) { |
| 31 | int mode = atoi(value); |
| 32 | switch (mode) { |
| 33 | case 20: |
| 34 | stream->codec->block_align = 38; |
| 35 | break; |
| 36 | case 30: |
| 37 | stream->codec->block_align = 50; |
| 38 | break; |
| 39 | default: |
| 40 | av_log(s, AV_LOG_ERROR, "Unsupported iLBC mode %d\n", mode); |
| 41 | return AVERROR(EINVAL); |
| 42 | } |
| 43 | } |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | static int ilbc_parse_sdp_line(AVFormatContext *s, int st_index, |
| 48 | PayloadContext *data, const char *line) |
| 49 | { |
| 50 | const char *p; |
| 51 | AVStream *st; |
| 52 | |
| 53 | if (st_index < 0) |
| 54 | return 0; |
| 55 | st = s->streams[st_index]; |
| 56 | |
| 57 | if (av_strstart(line, "fmtp:", &p)) { |
| 58 | int ret = ff_parse_fmtp(s, st, data, p, ilbc_parse_fmtp); |
| 59 | if (ret < 0) |
| 60 | return ret; |
| 61 | if (!st->codec->block_align) { |
| 62 | av_log(s, AV_LOG_ERROR, "No iLBC mode set\n"); |
| 63 | return AVERROR(EINVAL); |
| 64 | } |
| 65 | } |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | RTPDynamicProtocolHandler ff_ilbc_dynamic_handler = { |
| 70 | .enc_name = "iLBC", |
| 71 | .codec_type = AVMEDIA_TYPE_AUDIO, |
| 72 | .codec_id = AV_CODEC_ID_ILBC, |
| 73 | .parse_sdp_a_line = ilbc_parse_sdp_line, |
| 74 | }; |