1/* 2 * AIFF/AIFF-C demuxer 3 * Copyright (c) 2006 Patrick Guimond 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 "libavutil/intreadwrite.h" 23#include "libavutil/mathematics.h" 24#include "libavutil/dict.h" 25#include "avformat.h" 26#include "internal.h" 27#include "pcm.h" 28#include "aiff.h" 29#include "isom.h" 30#include "id3v2.h" 31#include "mov_chan.h" 32 33#define AIFF 0 34#define AIFF_C_VERSION1 0xA2805140 35 36typedef struct { 37 int64_t data_end; 38 int block_duration; 39} AIFFInputContext; 40 41static enum AVCodecID aiff_codec_get_id(int bps) 42{ 43 if (bps <= 8) 44 return AV_CODEC_ID_PCM_S8; 45 if (bps <= 16) 46 return AV_CODEC_ID_PCM_S16BE; 47 if (bps <= 24) 48 return AV_CODEC_ID_PCM_S24BE; 49 if (bps <= 32) 50 return AV_CODEC_ID_PCM_S32BE; 51 52 /* bigger than 32 isn't allowed */ 53 return AV_CODEC_ID_NONE; 54} 55 56/* returns the size of the found tag */ 57static int get_tag(AVIOContext *pb, uint32_t * tag) 58{ 59 int size; 60 61 if (url_feof(pb)) 62 return AVERROR(EIO); 63 64 *tag = avio_rl32(pb); 65 size = avio_rb32(pb); 66 67 if (size < 0) 68 size = 0x7fffffff; 69 70 return size; 71} 72 73/* Metadata string read */ 74static void get_meta(AVFormatContext *s, const char *key, int size) 75{ 76 uint8_t *str = av_malloc(size+1); 77 78 if (str) { 79 int res = avio_read(s->pb, str, size); 80 if (res < 0){ 81 av_free(str); 82 return; 83 } 84 size += (size&1)-res; 85 str[res] = 0; 86 av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL); 87 }else 88 size+= size&1; 89 90 avio_skip(s->pb, size); 91} 92 93/* Returns the number of sound data frames or negative on error */ 94static unsigned int get_aiff_header(AVFormatContext *s, int size, 95 unsigned version) 96{ 97 AVIOContext *pb = s->pb; 98 AVCodecContext *codec = s->streams[0]->codec; 99 AIFFInputContext *aiff = s->priv_data; 100 int exp; 101 uint64_t val; 102 double sample_rate; 103 unsigned int num_frames; 104 105 if (size & 1) 106 size++; 107 codec->codec_type = AVMEDIA_TYPE_AUDIO; 108 codec->channels = avio_rb16(pb); 109 num_frames = avio_rb32(pb); 110 codec->bits_per_coded_sample = avio_rb16(pb); 111 112 exp = avio_rb16(pb); 113 val = avio_rb64(pb); 114 sample_rate = ldexp(val, exp - 16383 - 63); 115 codec->sample_rate = sample_rate; 116 size -= 18; 117 118 /* get codec id for AIFF-C */ 119 if (version == AIFF_C_VERSION1) { 120 codec->codec_tag = avio_rl32(pb); 121 codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag); 122 size -= 4; 123 } 124 125 if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) { 126 codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample); 127 codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id); 128 aiff->block_duration = 1; 129 } else { 130 switch (codec->codec_id) { 131 case AV_CODEC_ID_PCM_F32BE: 132 case AV_CODEC_ID_PCM_F64BE: 133 case AV_CODEC_ID_PCM_S16LE: 134 case AV_CODEC_ID_PCM_ALAW: 135 case AV_CODEC_ID_PCM_MULAW: 136 aiff->block_duration = 1; 137 break; 138 case AV_CODEC_ID_ADPCM_IMA_QT: 139 codec->block_align = 34*codec->channels; 140 break; 141 case AV_CODEC_ID_MACE3: 142 codec->block_align = 2*codec->channels; 143 break; 144 case AV_CODEC_ID_ADPCM_G726LE: 145 codec->bits_per_coded_sample = 5; 146 case AV_CODEC_ID_ADPCM_G722: 147 case AV_CODEC_ID_MACE6: 148 codec->block_align = 1*codec->channels; 149 break; 150 case AV_CODEC_ID_GSM: 151 codec->block_align = 33; 152 break; 153 default: 154 aiff->block_duration = 1; 155 break; 156 } 157 if (codec->block_align > 0) 158 aiff->block_duration = av_get_audio_frame_duration(codec, 159 codec->block_align); 160 } 161 162 /* Block align needs to be computed in all cases, as the definition 163 * is specific to applications -> here we use the WAVE format definition */ 164 if (!codec->block_align) 165 codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3; 166 167 if (aiff->block_duration) { 168 codec->bit_rate = codec->sample_rate * (codec->block_align << 3) / 169 aiff->block_duration; 170 } 171 172 /* Chunk is over */ 173 if (size) 174 avio_skip(pb, size); 175 176 return num_frames; 177} 178 179static int aiff_probe(AVProbeData *p) 180{ 181 /* check file header */ 182 if (p->buf[0] == 'F' && p->buf[1] == 'O' && 183 p->buf[2] == 'R' && p->buf[3] == 'M' && 184 p->buf[8] == 'A' && p->buf[9] == 'I' && 185 p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C')) 186 return AVPROBE_SCORE_MAX; 187 else 188 return 0; 189} 190 191/* aiff input */ 192static int aiff_read_header(AVFormatContext *s) 193{ 194 int ret, size, filesize; 195 int64_t offset = 0, position; 196 uint32_t tag; 197 unsigned version = AIFF_C_VERSION1; 198 AVIOContext *pb = s->pb; 199 AVStream * st; 200 AIFFInputContext *aiff = s->priv_data; 201 ID3v2ExtraMeta *id3v2_extra_meta = NULL; 202 203 /* check FORM header */ 204 filesize = get_tag(pb, &tag); 205 if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M')) 206 return AVERROR_INVALIDDATA; 207 208 /* AIFF data type */ 209 tag = avio_rl32(pb); 210 if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */ 211 version = AIFF; 212 else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */ 213 return AVERROR_INVALIDDATA; 214 215 filesize -= 4; 216 217 st = avformat_new_stream(s, NULL); 218 if (!st) 219 return AVERROR(ENOMEM); 220 221 while (filesize > 0) { 222 /* parse different chunks */ 223 size = get_tag(pb, &tag); 224 if (size < 0) 225 return size; 226 227 filesize -= size + 8; 228 229 switch (tag) { 230 case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */ 231 /* Then for the complete header info */ 232 st->nb_frames = get_aiff_header(s, size, version); 233 if (st->nb_frames < 0) 234 return st->nb_frames; 235 if (offset > 0) // COMM is after SSND 236 goto got_sound; 237 break; 238 case MKTAG('I', 'D', '3', ' '): 239 position = avio_tell(pb); 240 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size); 241 if (id3v2_extra_meta) 242 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) { 243 ff_id3v2_free_extra_meta(&id3v2_extra_meta); 244 return ret; 245 } 246 ff_id3v2_free_extra_meta(&id3v2_extra_meta); 247 if (position + size > avio_tell(pb)) 248 avio_skip(pb, position + size - avio_tell(pb)); 249 break; 250 case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */ 251 version = avio_rb32(pb); 252 break; 253 case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */ 254 get_meta(s, "title" , size); 255 break; 256 case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */ 257 get_meta(s, "author" , size); 258 break; 259 case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */ 260 get_meta(s, "copyright", size); 261 break; 262 case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */ 263 get_meta(s, "comment" , size); 264 break; 265 case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */ 266 aiff->data_end = avio_tell(pb) + size; 267 offset = avio_rb32(pb); /* Offset of sound data */ 268 avio_rb32(pb); /* BlockSize... don't care */ 269 offset += avio_tell(pb); /* Compute absolute data offset */ 270 if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */ 271 goto got_sound; 272 if (!pb->seekable) { 273 av_log(s, AV_LOG_ERROR, "file is not seekable\n"); 274 return -1; 275 } 276 avio_skip(pb, size - 8); 277 break; 278 case MKTAG('w', 'a', 'v', 'e'): 279 if ((uint64_t)size > (1<<30)) 280 return -1; 281 if (ff_get_extradata(st->codec, pb, size) < 0) 282 return AVERROR(ENOMEM); 283 if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) { 284 st->codec->block_align = AV_RB32(st->codec->extradata+11*4); 285 aiff->block_duration = AV_RB32(st->codec->extradata+9*4); 286 } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) { 287 char rate = 0; 288 if (size >= 25) 289 rate = st->codec->extradata[24]; 290 switch (rate) { 291 case 'H': // RATE_HALF 292 st->codec->block_align = 17; 293 break; 294 case 'F': // RATE_FULL 295 default: 296 st->codec->block_align = 35; 297 } 298 aiff->block_duration = 160; 299 st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) / 300 aiff->block_duration; 301 } 302 break; 303 case MKTAG('C','H','A','N'): 304 if(ff_mov_read_chan(s, pb, st, size) < 0) 305 return AVERROR_INVALIDDATA; 306 break; 307 default: /* Jump */ 308 if (size & 1) /* Always even aligned */ 309 size++; 310 avio_skip(pb, size); 311 } 312 } 313 314got_sound: 315 if (!st->codec->block_align) { 316 av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n"); 317 return -1; 318 } 319 320 /* Now positioned, get the sound data start and end */ 321 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 322 st->start_time = 0; 323 st->duration = st->nb_frames * aiff->block_duration; 324 325 /* Position the stream at the first block */ 326 avio_seek(pb, offset, SEEK_SET); 327 328 return 0; 329} 330 331#define MAX_SIZE 4096 332 333static int aiff_read_packet(AVFormatContext *s, 334 AVPacket *pkt) 335{ 336 AVStream *st = s->streams[0]; 337 AIFFInputContext *aiff = s->priv_data; 338 int64_t max_size; 339 int res, size; 340 341 /* calculate size of remaining data */ 342 max_size = aiff->data_end - avio_tell(s->pb); 343 if (max_size <= 0) 344 return AVERROR_EOF; 345 346 /* Now for that packet */ 347 switch (st->codec->codec_id) { 348 case AV_CODEC_ID_ADPCM_IMA_QT: 349 case AV_CODEC_ID_GSM: 350 case AV_CODEC_ID_QDM2: 351 case AV_CODEC_ID_QCELP: 352 size = st->codec->block_align; 353 break; 354 default: 355 size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align; 356 } 357 size = FFMIN(max_size, size); 358 res = av_get_packet(s->pb, pkt, size); 359 if (res < 0) 360 return res; 361 362 if (size >= st->codec->block_align) 363 pkt->flags &= ~AV_PKT_FLAG_CORRUPT; 364 /* Only one stream in an AIFF file */ 365 pkt->stream_index = 0; 366 pkt->duration = (res / st->codec->block_align) * aiff->block_duration; 367 return 0; 368} 369 370AVInputFormat ff_aiff_demuxer = { 371 .name = "aiff", 372 .long_name = NULL_IF_CONFIG_SMALL("Audio IFF"), 373 .priv_data_size = sizeof(AIFFInputContext), 374 .read_probe = aiff_probe, 375 .read_header = aiff_read_header, 376 .read_packet = aiff_read_packet, 377 .read_seek = ff_pcm_read_seek, 378 .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 }, 379}; 380