libavformat/aiff.c

   1 /*
   2  * AIFF/AIFF-C muxer and 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/intfloat_readwrite.h"
  23 #include "avformat.h"
  24 #include "raw.h"
  25 #include "riff.h"
  26
  27 static const AVCodecTag codec_aiff_tags[] = {
  28     { CODEC_ID_PCM_S16BE,    MKTAG('N','O','N','E') },
  29     { CODEC_ID_PCM_S8,       MKTAG('N','O','N','E') },
  30     { CODEC_ID_PCM_S24BE,    MKTAG('N','O','N','E') },
  31     { CODEC_ID_PCM_S32BE,    MKTAG('N','O','N','E') },
  32     { CODEC_ID_PCM_F32BE,    MKTAG('f','l','3','2') },
  33     { CODEC_ID_PCM_F64BE,    MKTAG('f','l','6','4') },
  34     { CODEC_ID_PCM_ALAW,     MKTAG('a','l','a','w') },
  35     { CODEC_ID_PCM_MULAW,    MKTAG('u','l','a','w') },
  36     { CODEC_ID_MACE3,        MKTAG('M','A','C','3') },
  37     { CODEC_ID_MACE6,        MKTAG('M','A','C','6') },
  38     { CODEC_ID_GSM,          MKTAG('G','S','M',' ') },
  39     { CODEC_ID_ADPCM_G726,   MKTAG('G','7','2','6') },
  40     { CODEC_ID_PCM_S16LE,    MKTAG('s','o','w','t') },
  41     { CODEC_ID_ADPCM_IMA_QT, MKTAG('i','m','a','4') },
  42     { CODEC_ID_QDM2,         MKTAG('Q','D','M','2') },
  43     { 0, 0 },
  44 };
  45
  46 #define AIFF                    0
  47 #define AIFF_C_VERSION1         0xA2805140
  48
  49 typedef struct {
  50     int64_t data_end;
  51 } AIFFInputContext;
  52
  53 static enum CodecID aiff_codec_get_id(int bps)
  54 {
  55     if (bps <= 8)
  56         return CODEC_ID_PCM_S8;
  57     if (bps <= 16)
  58         return CODEC_ID_PCM_S16BE;
  59     if (bps <= 24)
  60         return CODEC_ID_PCM_S24BE;
  61     if (bps <= 32)
  62         return CODEC_ID_PCM_S32BE;
  63
  64     /* bigger than 32 isn't allowed  */
  65     return CODEC_ID_NONE;
  66 }
  67
  68 /* returns the size of the found tag */
  69 static int get_tag(ByteIOContext *pb, uint32_t * tag)
  70 {
  71     int size;
  72
  73     if (url_feof(pb))
  74         return AVERROR(EIO);
  75
  76     *tag = get_le32(pb);
  77     size = get_be32(pb);
  78
  79     if (size < 0)
  80         size = 0x7fffffff;
  81
  82     return size;
  83 }
  84
  85 /* Metadata string read */
  86 static void get_meta(AVFormatContext *s, const char *key, int size)
  87 {
  88     uint8_t str[1024];
  89     int res = get_buffer(s->pb, str, FFMIN(sizeof(str)-1, size));
  90     if (res < 0)
  91         return;
  92
  93     str[res] = 0;
  94     if (size & 1)
  95         size++;
  96     size -= res;
  97     if (size)
  98         url_fskip(s->pb, size);
  99
 100     av_metadata_set(&s->metadata, key, str);
 101 }
 102
 103 /* Returns the number of sound data frames or negative on error */
 104 static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
 105                              int size, unsigned version)
 106 {
 107     AVExtFloat ext;
 108     double sample_rate;
 109     unsigned int num_frames;
 110
 111     if (size & 1)
 112         size++;
 113     codec->codec_type = CODEC_TYPE_AUDIO;
 114     codec->channels = get_be16(pb);
 115     num_frames = get_be32(pb);
 116     codec->bits_per_coded_sample = get_be16(pb);
 117
 118     get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
 119     sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
 120     codec->sample_rate = sample_rate;
 121     size -= 18;
 122
 123     /* Got an AIFF-C? */
 124     if (version == AIFF_C_VERSION1) {
 125         codec->codec_tag = get_le32(pb);
 126         codec->codec_id  = ff_codec_get_id(codec_aiff_tags, codec->codec_tag);
 127
 128         switch (codec->codec_id) {
 129         case CODEC_ID_PCM_S16BE:
 130             codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 131             codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 132             break;
 133         case CODEC_ID_ADPCM_IMA_QT:
 134             codec->block_align = 34*codec->channels;
 135             codec->frame_size = 64;
 136             break;
 137         case CODEC_ID_MACE3:
 138             codec->block_align = 2*codec->channels;
 139             codec->frame_size = 6;
 140             break;
 141         case CODEC_ID_MACE6:
 142             codec->block_align = 1*codec->channels;
 143             codec->frame_size = 6;
 144             break;
 145         case CODEC_ID_GSM:
 146             codec->block_align = 33;
 147             codec->frame_size = 160;
 148             break;
 149         default:
 150             break;
 151         }
 152         size -= 4;
 153     } else {
 154         /* Need the codec type */
 155         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 156         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 157     }
 158
 159     /* Block align needs to be computed in all cases, as the definition
 160      * is specific to applications -> here we use the WAVE format definition */
 161     if (!codec->block_align)
 162         codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
 163
 164     codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
 165                        codec->sample_rate) * (codec->block_align << 3);
 166
 167     /* Chunk is over */
 168     if (size)
 169         url_fseek(pb, size, SEEK_CUR);
 170
 171     return num_frames;
 172 }
 173
 174 #if CONFIG_AIFF_MUXER
 175 typedef struct {
 176     int64_t form;
 177     int64_t frames;
 178     int64_t ssnd;
 179 } AIFFOutputContext;
 180
 181 static int aiff_write_header(AVFormatContext *s)
 182 {
 183     AIFFOutputContext *aiff = s->priv_data;
 184     ByteIOContext *pb = s->pb;
 185     AVCodecContext *enc = s->streams[0]->codec;
 186     AVExtFloat sample_rate;
 187     int aifc = 0;
 188
 189     /* First verify if format is ok */
 190     if (!enc->codec_tag)
 191         return -1;
 192     if (enc->codec_tag != MKTAG('N','O','N','E'))
 193         aifc = 1;
 194
 195     /* FORM AIFF header */
 196     put_tag(pb, "FORM");
 197     aiff->form = url_ftell(pb);
 198     put_be32(pb, 0);                    /* file length */
 199     put_tag(pb, aifc ? "AIFC" : "AIFF");
 200
 201     if (aifc) { // compressed audio
 202         enc->bits_per_coded_sample = 16;
 203         if (!enc->block_align) {
 204             av_log(s, AV_LOG_ERROR, "block align not set\n");
 205             return -1;
 206         }
 207         /* Version chunk */
 208         put_tag(pb, "FVER");
 209         put_be32(pb, 4);
 210         put_be32(pb, 0xA2805140);
 211     }
 212
 213     /* Common chunk */
 214     put_tag(pb, "COMM");
 215     put_be32(pb, aifc ? 24 : 18); /* size */
 216     put_be16(pb, enc->channels);  /* Number of channels */
 217
 218     aiff->frames = url_ftell(pb);
 219     put_be32(pb, 0);              /* Number of frames */
 220
 221     if (!enc->bits_per_coded_sample)
 222         enc->bits_per_coded_sample = av_get_bits_per_sample(enc->codec_id);
 223     if (!enc->bits_per_coded_sample) {
 224         av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
 225         return -1;
 226     }
 227     if (!enc->block_align)
 228         enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3;
 229
 230     put_be16(pb, enc->bits_per_coded_sample); /* Sample size */
 231
 232     sample_rate = av_dbl2ext((double)enc->sample_rate);
 233     put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
 234
 235     if (aifc) {
 236         put_le32(pb, enc->codec_tag);
 237         put_be16(pb, 0);
 238     }
 239
 240     /* Sound data chunk */
 241     put_tag(pb, "SSND");
 242     aiff->ssnd = url_ftell(pb);         /* Sound chunk size */
 243     put_be32(pb, 0);                    /* Sound samples data size */
 244     put_be32(pb, 0);                    /* Data offset */
 245     put_be32(pb, 0);                    /* Block-size (block align) */
 246
 247     av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
 248
 249     /* Data is starting here */
 250     put_flush_packet(pb);
 251
 252     return 0;
 253 }
 254
 255 static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
 256 {
 257     ByteIOContext *pb = s->pb;
 258     put_buffer(pb, pkt->data, pkt->size);
 259     return 0;
 260 }
 261
 262 static int aiff_write_trailer(AVFormatContext *s)
 263 {
 264     ByteIOContext *pb = s->pb;
 265     AIFFOutputContext *aiff = s->priv_data;
 266     AVCodecContext *enc = s->streams[0]->codec;
 267
 268     /* Chunks sizes must be even */
 269     int64_t file_size, end_size;
 270     end_size = file_size = url_ftell(pb);
 271     if (file_size & 1) {
 272         put_byte(pb, 0);
 273         end_size++;
 274     }
 275
 276     if (!url_is_streamed(s->pb)) {
 277         /* File length */
 278         url_fseek(pb, aiff->form, SEEK_SET);
 279         put_be32(pb, file_size - aiff->form - 4);
 280
 281         /* Number of sample frames */
 282         url_fseek(pb, aiff->frames, SEEK_SET);
 283         put_be32(pb, (file_size-aiff->ssnd-12)/enc->block_align);
 284
 285         /* Sound Data chunk size */
 286         url_fseek(pb, aiff->ssnd, SEEK_SET);
 287         put_be32(pb, file_size - aiff->ssnd - 4);
 288
 289         /* return to the end */
 290         url_fseek(pb, end_size, SEEK_SET);
 291
 292         put_flush_packet(pb);
 293     }
 294
 295     return 0;
 296 }
 297 #endif /* CONFIG_AIFF_MUXER */
 298
 299 static int aiff_probe(AVProbeData *p)
 300 {
 301     /* check file header */
 302     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
 303         p->buf[2] == 'R' && p->buf[3] == 'M' &&
 304         p->buf[8] == 'A' && p->buf[9] == 'I' &&
 305         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
 306         return AVPROBE_SCORE_MAX;
 307     else
 308         return 0;
 309 }
 310
 311 /* aiff input */
 312 static int aiff_read_header(AVFormatContext *s,
 313                             AVFormatParameters *ap)
 314 {
 315     int size, filesize;
 316     int64_t offset = 0;
 317     uint32_t tag;
 318     unsigned version = AIFF_C_VERSION1;
 319     ByteIOContext *pb = s->pb;
 320     AVStream * st;
 321     AIFFInputContext *aiff = s->priv_data;
 322
 323     /* check FORM header */
 324     filesize = get_tag(pb, &tag);
 325     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
 326         return AVERROR_INVALIDDATA;
 327
 328     /* AIFF data type */
 329     tag = get_le32(pb);
 330     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
 331         version = AIFF;
 332     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
 333         return AVERROR_INVALIDDATA;
 334
 335     filesize -= 4;
 336
 337     st = av_new_stream(s, 0);
 338     if (!st)
 339         return AVERROR(ENOMEM);
 340
 341     while (filesize > 0) {
 342         /* parse different chunks */
 343         size = get_tag(pb, &tag);
 344         if (size < 0)
 345             return size;
 346
 347         filesize -= size + 8;
 348
 349         switch (tag) {
 350         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
 351             /* Then for the complete header info */
 352             st->nb_frames = get_aiff_header(pb, st->codec, size, version);
 353             if (st->nb_frames < 0)
 354                 return st->nb_frames;
 355             if (offset > 0) // COMM is after SSND
 356                 goto got_sound;
 357             break;
 358         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
 359             version = get_be32(pb);
 360             break;
 361         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
 362             get_meta(s, "title"    , size);
 363             break;
 364         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
 365             get_meta(s, "author"   , size);
 366             break;
 367         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
 368             get_meta(s, "copyright", size);
 369             break;
 370         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
 371             get_meta(s, "comment"  , size);
 372             break;
 373         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
 374             aiff->data_end = url_ftell(pb) + size;
 375             offset = get_be32(pb);      /* Offset of sound data */
 376             get_be32(pb);               /* BlockSize... don't care */
 377             offset += url_ftell(pb);    /* Compute absolute data offset */
 378             if (st->codec->block_align)    /* Assume COMM already parsed */
 379                 goto got_sound;
 380             if (url_is_streamed(pb)) {
 381                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
 382                 return -1;
 383             }
 384             url_fskip(pb, size - 8);
 385             break;
 386         case MKTAG('w', 'a', 'v', 'e'):
 387             if ((uint64_t)size > (1<<30))
 388                 return -1;
 389             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
 390             if (!st->codec->extradata)
 391                 return AVERROR(ENOMEM);
 392             st->codec->extradata_size = size;
 393             get_buffer(pb, st->codec->extradata, size);
 394             break;
 395         default: /* Jump */
 396             if (size & 1)   /* Always even aligned */
 397                 size++;
 398             url_fskip (pb, size);
 399         }
 400     }
 401
 402     if (!st->codec->block_align) {
 403         av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
 404         return -1;
 405     }
 406
 407 got_sound:
 408     /* Now positioned, get the sound data start and end */
 409     if (st->nb_frames)
 410         s->file_size = st->nb_frames * st->codec->block_align;
 411
 412     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 413     st->start_time = 0;
 414     st->duration = st->codec->frame_size ?
 415         st->nb_frames * st->codec->frame_size : st->nb_frames;
 416
 417     /* Position the stream at the first block */
 418     url_fseek(pb, offset, SEEK_SET);
 419
 420     return 0;
 421 }
 422
 423 #define MAX_SIZE 4096
 424
 425 static int aiff_read_packet(AVFormatContext *s,
 426                             AVPacket *pkt)
 427 {
 428     AVStream *st = s->streams[0];
 429     AIFFInputContext *aiff = s->priv_data;
 430     int64_t max_size;
 431     int res;
 432
 433     /* calculate size of remaining data */
 434     max_size = aiff->data_end - url_ftell(s->pb);
 435     if (max_size <= 0)
 436         return AVERROR_EOF;
 437
 438     /* Now for that packet */
 439     max_size = FFMIN(max_size, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
 440     res = av_get_packet(s->pb, pkt, max_size);
 441     if (res < 0)
 442         return res;
 443
 444     /* Only one stream in an AIFF file */
 445     pkt->stream_index = 0;
 446     return 0;
 447 }
 448
 449 #if CONFIG_AIFF_DEMUXER
 450 AVInputFormat aiff_demuxer = {
 451     "aiff",
 452     NULL_IF_CONFIG_SMALL("Audio IFF"),
 453     sizeof(AIFFInputContext),
 454     aiff_probe,
 455     aiff_read_header,
 456     aiff_read_packet,
 457     NULL,
 458     pcm_read_seek,
 459     .codec_tag= (const AVCodecTag* const []){codec_aiff_tags, 0},
 460 };
 461 #endif
 462
 463 #if CONFIG_AIFF_MUXER
 464 AVOutputFormat aiff_muxer = {
 465     "aiff",
 466     NULL_IF_CONFIG_SMALL("Audio IFF"),
 467     "audio/aiff",
 468     "aif,aiff,afc,aifc",
 469     sizeof(AIFFOutputContext),
 470     CODEC_ID_PCM_S16BE,
 471     CODEC_ID_NONE,
 472     aiff_write_header,
 473     aiff_write_packet,
 474     aiff_write_trailer,
 475     .codec_tag= (const AVCodecTag* const []){codec_aiff_tags, 0},
 476 };
 477 #endif