| 1 | /* |
| 2 | * AU muxer and demuxer |
| 3 | * Copyright (c) 2001 Fabrice Bellard |
| 4 | * |
| 5 | * first version by Francois Revol <revol@free.fr> |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * Reference documents: |
| 26 | * http://www.opengroup.org/public/pubs/external/auformat.html |
| 27 | * http://www.goice.co.jp/member/mo/formats/au.html |
| 28 | */ |
| 29 | |
| 30 | #include "avformat.h" |
| 31 | #include "internal.h" |
| 32 | #include "avio_internal.h" |
| 33 | #include "pcm.h" |
| 34 | #include "libavutil/avassert.h" |
| 35 | |
| 36 | /* if we don't know the size in advance */ |
| 37 | #define AU_UNKNOWN_SIZE ((uint32_t)(~0)) |
| 38 | /* the specification requires an annotation field of at least eight bytes */ |
| 39 | #define AU_HEADER_SIZE (24+8) |
| 40 | |
| 41 | static const AVCodecTag codec_au_tags[] = { |
| 42 | { AV_CODEC_ID_PCM_MULAW, 1 }, |
| 43 | { AV_CODEC_ID_PCM_S8, 2 }, |
| 44 | { AV_CODEC_ID_PCM_S16BE, 3 }, |
| 45 | { AV_CODEC_ID_PCM_S24BE, 4 }, |
| 46 | { AV_CODEC_ID_PCM_S32BE, 5 }, |
| 47 | { AV_CODEC_ID_PCM_F32BE, 6 }, |
| 48 | { AV_CODEC_ID_PCM_F64BE, 7 }, |
| 49 | { AV_CODEC_ID_ADPCM_G726LE, 23 }, |
| 50 | { AV_CODEC_ID_ADPCM_G722,24 }, |
| 51 | { AV_CODEC_ID_ADPCM_G726LE, 25 }, |
| 52 | { AV_CODEC_ID_ADPCM_G726LE, 26 }, |
| 53 | { AV_CODEC_ID_PCM_ALAW, 27 }, |
| 54 | { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') }, |
| 55 | { AV_CODEC_ID_NONE, 0 }, |
| 56 | }; |
| 57 | |
| 58 | #if CONFIG_AU_DEMUXER |
| 59 | |
| 60 | static int au_probe(AVProbeData *p) |
| 61 | { |
| 62 | if (p->buf[0] == '.' && p->buf[1] == 's' && |
| 63 | p->buf[2] == 'n' && p->buf[3] == 'd') |
| 64 | return AVPROBE_SCORE_MAX; |
| 65 | else |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | #define BLOCK_SIZE 1024 |
| 70 | |
| 71 | static int au_read_header(AVFormatContext *s) |
| 72 | { |
| 73 | int size, data_size = 0; |
| 74 | unsigned int tag; |
| 75 | AVIOContext *pb = s->pb; |
| 76 | unsigned int id, channels, rate; |
| 77 | int bps; |
| 78 | enum AVCodecID codec; |
| 79 | AVStream *st; |
| 80 | |
| 81 | tag = avio_rl32(pb); |
| 82 | if (tag != MKTAG('.', 's', 'n', 'd')) |
| 83 | return AVERROR_INVALIDDATA; |
| 84 | size = avio_rb32(pb); /* header size */ |
| 85 | data_size = avio_rb32(pb); /* data size in bytes */ |
| 86 | |
| 87 | if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) { |
| 88 | av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size); |
| 89 | return AVERROR_INVALIDDATA; |
| 90 | } |
| 91 | |
| 92 | id = avio_rb32(pb); |
| 93 | rate = avio_rb32(pb); |
| 94 | channels = avio_rb32(pb); |
| 95 | |
| 96 | if (size > 24) { |
| 97 | /* skip unused data */ |
| 98 | avio_skip(pb, size - 24); |
| 99 | } |
| 100 | |
| 101 | codec = ff_codec_get_id(codec_au_tags, id); |
| 102 | |
| 103 | if (codec == AV_CODEC_ID_NONE) { |
| 104 | avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id); |
| 105 | return AVERROR_PATCHWELCOME; |
| 106 | } |
| 107 | |
| 108 | bps = av_get_bits_per_sample(codec); |
| 109 | if (codec == AV_CODEC_ID_ADPCM_G726LE) { |
| 110 | if (id == MKBETAG('7','2','6','2')) { |
| 111 | bps = 2; |
| 112 | } else { |
| 113 | const uint8_t bpcss[] = {4, 0, 3, 5}; |
| 114 | av_assert0(id >= 23 && id < 23 + 4); |
| 115 | bps = bpcss[id - 23]; |
| 116 | } |
| 117 | } else if (!bps) { |
| 118 | avpriv_request_sample(s, "Unknown bits per sample"); |
| 119 | return AVERROR_PATCHWELCOME; |
| 120 | } |
| 121 | |
| 122 | if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) { |
| 123 | av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels); |
| 124 | return AVERROR_INVALIDDATA; |
| 125 | } |
| 126 | |
| 127 | if (rate == 0 || rate > INT_MAX) { |
| 128 | av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate); |
| 129 | return AVERROR_INVALIDDATA; |
| 130 | } |
| 131 | |
| 132 | st = avformat_new_stream(s, NULL); |
| 133 | if (!st) |
| 134 | return AVERROR(ENOMEM); |
| 135 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 136 | st->codec->codec_tag = id; |
| 137 | st->codec->codec_id = codec; |
| 138 | st->codec->channels = channels; |
| 139 | st->codec->sample_rate = rate; |
| 140 | st->codec->bits_per_coded_sample = bps; |
| 141 | st->codec->bit_rate = channels * rate * bps; |
| 142 | st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1); |
| 143 | if (data_size != AU_UNKNOWN_SIZE) |
| 144 | st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps); |
| 145 | |
| 146 | st->start_time = 0; |
| 147 | avpriv_set_pts_info(st, 64, 1, rate); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | AVInputFormat ff_au_demuxer = { |
| 153 | .name = "au", |
| 154 | .long_name = NULL_IF_CONFIG_SMALL("Sun AU"), |
| 155 | .read_probe = au_probe, |
| 156 | .read_header = au_read_header, |
| 157 | .read_packet = ff_pcm_read_packet, |
| 158 | .read_seek = ff_pcm_read_seek, |
| 159 | .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 }, |
| 160 | }; |
| 161 | |
| 162 | #endif /* CONFIG_AU_DEMUXER */ |
| 163 | |
| 164 | #if CONFIG_AU_MUXER |
| 165 | |
| 166 | #include "rawenc.h" |
| 167 | |
| 168 | static int au_write_header(AVFormatContext *s) |
| 169 | { |
| 170 | AVIOContext *pb = s->pb; |
| 171 | AVCodecContext *enc = s->streams[0]->codec; |
| 172 | |
| 173 | if (s->nb_streams != 1) { |
| 174 | av_log(s, AV_LOG_ERROR, "only one stream is supported\n"); |
| 175 | return AVERROR(EINVAL); |
| 176 | } |
| 177 | |
| 178 | enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id); |
| 179 | if (!enc->codec_tag) { |
| 180 | av_log(s, AV_LOG_ERROR, "unsupported codec\n"); |
| 181 | return AVERROR(EINVAL); |
| 182 | } |
| 183 | |
| 184 | ffio_wfourcc(pb, ".snd"); /* magic number */ |
| 185 | avio_wb32(pb, AU_HEADER_SIZE); /* header size */ |
| 186 | avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */ |
| 187 | avio_wb32(pb, enc->codec_tag); /* codec ID */ |
| 188 | avio_wb32(pb, enc->sample_rate); |
| 189 | avio_wb32(pb, enc->channels); |
| 190 | avio_wb64(pb, 0); /* annotation field */ |
| 191 | avio_flush(pb); |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int au_write_trailer(AVFormatContext *s) |
| 197 | { |
| 198 | AVIOContext *pb = s->pb; |
| 199 | int64_t file_size = avio_tell(pb); |
| 200 | |
| 201 | if (s->pb->seekable && file_size < INT32_MAX) { |
| 202 | /* update file size */ |
| 203 | avio_seek(pb, 8, SEEK_SET); |
| 204 | avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE)); |
| 205 | avio_seek(pb, file_size, SEEK_SET); |
| 206 | avio_flush(pb); |
| 207 | } |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | AVOutputFormat ff_au_muxer = { |
| 213 | .name = "au", |
| 214 | .long_name = NULL_IF_CONFIG_SMALL("Sun AU"), |
| 215 | .mime_type = "audio/basic", |
| 216 | .extensions = "au", |
| 217 | .audio_codec = AV_CODEC_ID_PCM_S16BE, |
| 218 | .video_codec = AV_CODEC_ID_NONE, |
| 219 | .write_header = au_write_header, |
| 220 | .write_packet = ff_raw_write_packet, |
| 221 | .write_trailer = au_write_trailer, |
| 222 | .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 }, |
| 223 | .flags = AVFMT_NOTIMESTAMPS, |
| 224 | }; |
| 225 | |
| 226 | #endif /* CONFIG_AU_MUXER */ |