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