libavformat/aiffdec.c

   1 /*
   2  * AIFF/AIFF-C demuxer
   3  * Copyright (c) 2006  Patrick Guimond
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/mathematics.h"
  23 #include "libavutil/dict.h"
  24 #include "avformat.h"
  25 #include "internal.h"
  26 #include "pcm.h"
  27 #include "aiff.h"
  28
  29 #define AIFF                    0
  30 #define AIFF_C_VERSION1         0xA2805140
  31
  32 typedef struct {
  33     int64_t data_end;
  34     int block_duration;
  35 } AIFFInputContext;
  36
  37 static enum AVCodecID aiff_codec_get_id(int bps)
  38 {
  39     if (bps <= 8)
  40         return AV_CODEC_ID_PCM_S8;
  41     if (bps <= 16)
  42         return AV_CODEC_ID_PCM_S16BE;
  43     if (bps <= 24)
  44         return AV_CODEC_ID_PCM_S24BE;
  45     if (bps <= 32)
  46         return AV_CODEC_ID_PCM_S32BE;
  47
  48     /* bigger than 32 isn't allowed  */
  49     return AV_CODEC_ID_NONE;
  50 }
  51
  52 /* returns the size of the found tag */
  53 static int get_tag(AVIOContext *pb, uint32_t * tag)
  54 {
  55     int size;
  56
  57     if (pb->eof_reached)
  58         return AVERROR(EIO);
  59
  60     *tag = avio_rl32(pb);
  61     size = avio_rb32(pb);
  62
  63     if (size < 0)
  64         size = 0x7fffffff;
  65
  66     return size;
  67 }
  68
  69 /* Metadata string read */
  70 static void get_meta(AVFormatContext *s, const char *key, int size)
  71 {
  72     uint8_t *str = av_malloc(size+1);
  73     int res;
  74
  75     if (!str) {
  76         avio_skip(s->pb, size);
  77         return;
  78     }
  79
  80     res = avio_read(s->pb, str, size);
  81     if (res < 0)
  82         return;
  83
  84     str[res] = 0;
  85     av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
  86 }
  87
  88 /* Returns the number of sound data frames or negative on error */
  89 static unsigned int get_aiff_header(AVFormatContext *s, int size,
  90                                     unsigned version)
  91 {
  92     AVIOContext *pb        = s->pb;
  93     AVCodecContext *codec  = s->streams[0]->codec;
  94     AIFFInputContext *aiff = s->priv_data;
  95     int exp;
  96     uint64_t val;
  97     double sample_rate;
  98     unsigned int num_frames;
  99
 100     if (size & 1)
 101         size++;
 102     codec->codec_type = AVMEDIA_TYPE_AUDIO;
 103     codec->channels = avio_rb16(pb);
 104     num_frames = avio_rb32(pb);
 105     codec->bits_per_coded_sample = avio_rb16(pb);
 106
 107     exp = avio_rb16(pb);
 108     val = avio_rb64(pb);
 109     sample_rate = ldexp(val, exp - 16383 - 63);
 110     codec->sample_rate = sample_rate;
 111     size -= 18;
 112
 113     /* get codec id for AIFF-C */
 114     if (version == AIFF_C_VERSION1) {
 115         codec->codec_tag = avio_rl32(pb);
 116         codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
 117         size -= 4;
 118     }
 119
 120     if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
 121         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 122         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 123         aiff->block_duration = 1;
 124     } else {
 125         switch (codec->codec_id) {
 126         case AV_CODEC_ID_PCM_F32BE:
 127         case AV_CODEC_ID_PCM_F64BE:
 128         case AV_CODEC_ID_PCM_S16LE:
 129         case AV_CODEC_ID_PCM_ALAW:
 130         case AV_CODEC_ID_PCM_MULAW:
 131             aiff->block_duration = 1;
 132             break;
 133         case AV_CODEC_ID_ADPCM_IMA_QT:
 134             codec->block_align = 34*codec->channels;
 135             break;
 136         case AV_CODEC_ID_MACE3:
 137             codec->block_align = 2*codec->channels;
 138             break;
 139         case AV_CODEC_ID_MACE6:
 140             codec->block_align = 1*codec->channels;
 141             break;
 142         case AV_CODEC_ID_GSM:
 143             codec->block_align = 33;
 144             break;
 145         case AV_CODEC_ID_QCELP:
 146             codec->block_align = 35;
 147             break;
 148         default:
 149             break;
 150         }
 151         if (codec->block_align > 0)
 152             aiff->block_duration = av_get_audio_frame_duration(codec,
 153                                                                codec->block_align);
 154     }
 155
 156     /* Block align needs to be computed in all cases, as the definition
 157      * is specific to applications -> here we use the WAVE format definition */
 158     if (!codec->block_align)
 159         codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
 160
 161     if (aiff->block_duration) {
 162         codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
 163                           aiff->block_duration;
 164     }
 165
 166     /* Chunk is over */
 167     if (size)
 168         avio_skip(pb, size);
 169
 170     return num_frames;
 171 }
 172
 173 static int aiff_probe(AVProbeData *p)
 174 {
 175     /* check file header */
 176     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
 177         p->buf[2] == 'R' && p->buf[3] == 'M' &&
 178         p->buf[8] == 'A' && p->buf[9] == 'I' &&
 179         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
 180         return AVPROBE_SCORE_MAX;
 181     else
 182         return 0;
 183 }
 184
 185 /* aiff input */
 186 static int aiff_read_header(AVFormatContext *s)
 187 {
 188     int size, filesize;
 189     int64_t offset = 0;
 190     uint32_t tag;
 191     unsigned version = AIFF_C_VERSION1;
 192     AVIOContext *pb = s->pb;
 193     AVStream * st;
 194     AIFFInputContext *aiff = s->priv_data;
 195
 196     /* check FORM header */
 197     filesize = get_tag(pb, &tag);
 198     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
 199         return AVERROR_INVALIDDATA;
 200
 201     /* AIFF data type */
 202     tag = avio_rl32(pb);
 203     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
 204         version = AIFF;
 205     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
 206         return AVERROR_INVALIDDATA;
 207
 208     filesize -= 4;
 209
 210     st = avformat_new_stream(s, NULL);
 211     if (!st)
 212         return AVERROR(ENOMEM);
 213
 214     while (filesize > 0) {
 215         /* parse different chunks */
 216         size = get_tag(pb, &tag);
 217         if (size < 0)
 218             return size;
 219
 220         filesize -= size + 8;
 221
 222         switch (tag) {
 223         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
 224             /* Then for the complete header info */
 225             st->nb_frames = get_aiff_header(s, size, version);
 226             if (st->nb_frames < 0)
 227                 return st->nb_frames;
 228             if (offset > 0) // COMM is after SSND
 229                 goto got_sound;
 230             break;
 231         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
 232             version = avio_rb32(pb);
 233             break;
 234         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
 235             get_meta(s, "title"    , size);
 236             break;
 237         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
 238             get_meta(s, "author"   , size);
 239             break;
 240         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
 241             get_meta(s, "copyright", size);
 242             break;
 243         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
 244             get_meta(s, "comment"  , size);
 245             break;
 246         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
 247             aiff->data_end = avio_tell(pb) + size;
 248             offset = avio_rb32(pb);      /* Offset of sound data */
 249             avio_rb32(pb);               /* BlockSize... don't care */
 250             offset += avio_tell(pb);    /* Compute absolute data offset */
 251             if (st->codec->block_align)    /* Assume COMM already parsed */
 252                 goto got_sound;
 253             if (!pb->seekable) {
 254                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
 255                 return -1;
 256             }
 257             avio_skip(pb, size - 8);
 258             break;
 259         case MKTAG('w', 'a', 'v', 'e'):
 260             if ((uint64_t)size > (1<<30))
 261                 return -1;
 262             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
 263             if (!st->codec->extradata)
 264                 return AVERROR(ENOMEM);
 265             st->codec->extradata_size = size;
 266             avio_read(pb, st->codec->extradata, size);
 267             break;
 268         default: /* Jump */
 269             if (size & 1)   /* Always even aligned */
 270                 size++;
 271             avio_skip(pb, size);
 272         }
 273     }
 274
 275 got_sound:
 276     if (!st->codec->block_align) {
 277         av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
 278         return -1;
 279     }
 280
 281     /* Now positioned, get the sound data start and end */
 282     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
 283     st->start_time = 0;
 284     st->duration = st->nb_frames * aiff->block_duration;
 285
 286     /* Position the stream at the first block */
 287     avio_seek(pb, offset, SEEK_SET);
 288
 289     return 0;
 290 }
 291
 292 #define MAX_SIZE 4096
 293
 294 static int aiff_read_packet(AVFormatContext *s,
 295                             AVPacket *pkt)
 296 {
 297     AVStream *st = s->streams[0];
 298     AIFFInputContext *aiff = s->priv_data;
 299     int64_t max_size;
 300     int res, size;
 301
 302     /* calculate size of remaining data */
 303     max_size = aiff->data_end - avio_tell(s->pb);
 304     if (max_size <= 0)
 305         return AVERROR_EOF;
 306
 307     /* Now for that packet */
 308     if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
 309         size = st->codec->block_align;
 310     else
 311         size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
 312     size = FFMIN(max_size, size);
 313     res = av_get_packet(s->pb, pkt, size);
 314     if (res < 0)
 315         return res;
 316
 317     /* Only one stream in an AIFF file */
 318     pkt->stream_index = 0;
 319     pkt->duration     = (res / st->codec->block_align) * aiff->block_duration;
 320     return 0;
 321 }
 322
 323 AVInputFormat ff_aiff_demuxer = {
 324     .name           = "aiff",
 325     .long_name      = NULL_IF_CONFIG_SMALL("Audio IFF"),
 326     .priv_data_size = sizeof(AIFFInputContext),
 327     .read_probe     = aiff_probe,
 328     .read_header    = aiff_read_header,
 329     .read_packet    = aiff_read_packet,
 330     .read_seek      = ff_pcm_read_seek,
 331     .codec_tag      = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
 332 };