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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * iLBC storage file format |
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| 3 | * Copyright (c) 2012 Martin Storsjo |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "avformat.h" |
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| 23 | #include "internal.h" |
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| 24 | |||
| 25 | static const char mode20_header[] = "#!iLBC20\n"; |
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| 26 | static const char mode30_header[] = "#!iLBC30\n"; |
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| 27 | |||
| 28 | static int ilbc_write_header(AVFormatContext *s) |
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| 29 | { |
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| 30 | AVIOContext *pb = s->pb; |
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| 31 | AVCodecContext *enc; |
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| 32 | |||
| 33 | if (s->nb_streams != 1) { |
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| 34 | av_log(s, AV_LOG_ERROR, "Unsupported number of streams\n"); |
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| 35 | return AVERROR(EINVAL); |
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| 36 | } |
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| 37 | enc = s->streams[0]->codec; |
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| 38 | |||
| 39 | if (enc->codec_id != AV_CODEC_ID_ILBC) { |
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| 40 | av_log(s, AV_LOG_ERROR, "Unsupported codec\n"); |
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| 41 | return AVERROR(EINVAL); |
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| 42 | } |
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| 43 | |||
| 44 | if (enc->block_align == 50) { |
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| 45 | avio_write(pb, mode30_header, sizeof(mode30_header) - 1); |
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| 46 | } else if (enc->block_align == 38) { |
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| 47 | avio_write(pb, mode20_header, sizeof(mode20_header) - 1); |
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| 48 | } else { |
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| 49 | av_log(s, AV_LOG_ERROR, "Unsupported mode\n"); |
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| 50 | return AVERROR(EINVAL); |
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| 51 | } |
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| 52 | avio_flush(pb); |
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| 53 | return 0; |
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| 54 | } |
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| 55 | |||
| 56 | static int ilbc_write_packet(AVFormatContext *s, AVPacket *pkt) |
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| 57 | { |
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| 58 | avio_write(s->pb, pkt->data, pkt->size); |
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| 59 | return 0; |
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| 60 | } |
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| 61 | |||
| 62 | static int ilbc_probe(AVProbeData *p) |
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| 63 | { |
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| 64 | // Only check for "#!iLBC" which matches both formats |
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| 65 | if (!memcmp(p->buf, mode20_header, 6)) |
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| 66 | return AVPROBE_SCORE_MAX; |
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| 67 | else |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |||
| 71 | static int ilbc_read_header(AVFormatContext *s) |
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| 72 | { |
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| 73 | AVIOContext *pb = s->pb; |
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| 74 | AVStream *st; |
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| 75 | uint8_t header[9]; |
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| 76 | |||
| 77 | avio_read(pb, header, 9); |
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| 78 | |||
| 79 | st = avformat_new_stream(s, NULL); |
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| 80 | if (!st) |
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| 81 | return AVERROR(ENOMEM); |
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| 82 | st->codec->codec_id = AV_CODEC_ID_ILBC; |
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| 83 | st->codec->sample_rate = 8000; |
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| 84 | st->codec->channels = 1; |
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| 85 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 86 | st->start_time = 0; |
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| 87 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 88 | if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) { |
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| 89 | st->codec->block_align = 38; |
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| 90 | st->codec->bit_rate = 15200; |
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| 91 | } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) { |
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| 92 | st->codec->block_align = 50; |
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| 93 | st->codec->bit_rate = 13333; |
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| 94 | } else { |
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| 95 | av_log(s, AV_LOG_ERROR, "Unrecognized iLBC file header\n"); |
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| 96 | return AVERROR_INVALIDDATA; |
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| 97 | } |
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| 98 | |||
| 99 | return 0; |
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| 100 | } |
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| 101 | |||
| 102 | static int ilbc_read_packet(AVFormatContext *s, |
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| 103 | AVPacket *pkt) |
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| 104 | { |
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| 105 | AVCodecContext *enc = s->streams[0]->codec; |
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| 106 | int ret; |
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| 107 | |||
| 108 | if ((ret = av_new_packet(pkt, enc->block_align)) < 0) |
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| 109 | return ret; |
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| 110 | |||
| 111 | pkt->stream_index = 0; |
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| 112 | pkt->pos = avio_tell(s->pb); |
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| 113 | pkt->duration = enc->block_align == 38 ? 160 : 240; |
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| 114 | if ((ret = avio_read(s->pb, pkt->data, enc->block_align)) != enc->block_align) { |
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| 115 | av_free_packet(pkt); |
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| 116 | return ret < 0 ? ret : AVERROR(EIO); |
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| 117 | } |
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| 118 | |||
| 119 | return 0; |
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| 120 | } |
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| 121 | |||
| 122 | AVInputFormat ff_ilbc_demuxer = { |
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| 123 | .name = "ilbc", |
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| 124 | .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"), |
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| 125 | .read_probe = ilbc_probe, |
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| 126 | .read_header = ilbc_read_header, |
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| 127 | .read_packet = ilbc_read_packet, |
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| 128 | .flags = AVFMT_GENERIC_INDEX, |
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| 129 | }; |
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| 130 | |||
| 131 | AVOutputFormat ff_ilbc_muxer = { |
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| 132 | .name = "ilbc", |
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| 133 | .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"), |
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| 134 | .mime_type = "audio/iLBC", |
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| 135 | .extensions = "lbc", |
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| 136 | .audio_codec = AV_CODEC_ID_ILBC, |
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| 137 | .write_header = ilbc_write_header, |
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| 138 | .write_packet = ilbc_write_packet, |
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| 139 | .flags = AVFMT_NOTIMESTAMPS, |
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| 140 | }; |