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