libavformat/aiffdec.c

   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/intfloat_readwrite.h"
  23 #include "avformat.h"
  24 #include "raw.h"
  25 #include "aiff.h"
  26
  27 #define AIFF                    0
  28 #define AIFF_C_VERSION1         0xA2805140
  29
  30 typedef struct {
  31     int64_t data_end;
  32 } AIFFInputContext;
  33
  34 static enum CodecID aiff_codec_get_id(int bps)
  35 {
  36     if (bps <= 8)
  37         return CODEC_ID_PCM_S8;
  38     if (bps <= 16)
  39         return CODEC_ID_PCM_S16BE;
  40     if (bps <= 24)
  41         return CODEC_ID_PCM_S24BE;
  42     if (bps <= 32)
  43         return CODEC_ID_PCM_S32BE;
  44
  45     /* bigger than 32 isn't allowed  */
  46     return CODEC_ID_NONE;
  47 }
  48
  49 /* returns the size of the found tag */
  50 static int get_tag(ByteIOContext *pb, uint32_t * tag)
  51 {
  52     int size;
  53
  54     if (url_feof(pb))
  55         return AVERROR(EIO);
  56
  57     *tag = get_le32(pb);
  58     size = get_be32(pb);
  59
  60     if (size < 0)
  61         size = 0x7fffffff;
  62
  63     return size;
  64 }
  65
  66 /* Metadata string read */
  67 static void get_meta(AVFormatContext *s, const char *key, int size)
  68 {
  69     uint8_t str[1024];
  70     int res = get_buffer(s->pb, str, FFMIN(sizeof(str)-1, size));
  71     if (res < 0)
  72         return;
  73
  74     str[res] = 0;
  75     if (size & 1)
  76         size++;
  77     size -= res;
  78     if (size)
  79         url_fskip(s->pb, size);
  80
  81     av_metadata_set(&s->metadata, key, str);
  82 }
  83
  84 /* Returns the number of sound data frames or negative on error */
  85 static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
  86                              int size, unsigned version)
  87 {
  88     AVExtFloat ext;
  89     double sample_rate;
  90     unsigned int num_frames;
  91
  92     if (size & 1)
  93         size++;
  94     codec->codec_type = CODEC_TYPE_AUDIO;
  95     codec->channels = get_be16(pb);
  96     num_frames = get_be32(pb);
  97     codec->bits_per_coded_sample = get_be16(pb);
  98
  99     get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
 100     sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
 101     codec->sample_rate = sample_rate;
 102     size -= 18;
 103
 104     /* Got an AIFF-C? */
 105     if (version == AIFF_C_VERSION1) {
 106         codec->codec_tag = get_le32(pb);
 107         codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
 108
 109         switch (codec->codec_id) {
 110         case CODEC_ID_PCM_S16BE:
 111             codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 112             codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 113             break;
 114         case CODEC_ID_ADPCM_IMA_QT:
 115             codec->block_align = 34*codec->channels;
 116             codec->frame_size = 64;
 117             break;
 118         case CODEC_ID_MACE3:
 119             codec->block_align = 2*codec->channels;
 120             codec->frame_size = 6;
 121             break;
 122         case CODEC_ID_MACE6:
 123             codec->block_align = 1*codec->channels;
 124             codec->frame_size = 6;
 125             break;
 126         case CODEC_ID_GSM:
 127             codec->block_align = 33;
 128             codec->frame_size = 160;
 129             break;
 130         default:
 131             break;
 132         }
 133         size -= 4;
 134     } else {
 135         /* Need the codec type */
 136         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
 137         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
 138     }
 139
 140     /* Block align needs to be computed in all cases, as the definition
 141      * is specific to applications -> here we use the WAVE format definition */
 142     if (!codec->block_align)
 143         codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
 144
 145     codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
 146                        codec->sample_rate) * (codec->block_align << 3);
 147
 148     /* Chunk is over */
 149     if (size)
 150         url_fseek(pb, size, SEEK_CUR);
 151
 152     return num_frames;
 153 }
 154
 155 static int aiff_probe(AVProbeData *p)
 156 {
 157     /* check file header */
 158     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
 159         p->buf[2] == 'R' && p->buf[3] == 'M' &&
 160         p->buf[8] == 'A' && p->buf[9] == 'I' &&
 161         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
 162         return AVPROBE_SCORE_MAX;
 163     else
 164         return 0;
 165 }
 166
 167 /* aiff input */
 168 static int aiff_read_header(AVFormatContext *s,
 169                             AVFormatParameters *ap)
 170 {
 171     int size, filesize;
 172     int64_t offset = 0;
 173     uint32_t tag;
 174     unsigned version = AIFF_C_VERSION1;
 175     ByteIOContext *pb = s->pb;
 176     AVStream * st;
 177     AIFFInputContext *aiff = s->priv_data;
 178
 179     /* check FORM header */
 180     filesize = get_tag(pb, &tag);
 181     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
 182         return AVERROR_INVALIDDATA;
 183
 184     /* AIFF data type */
 185     tag = get_le32(pb);
 186     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
 187         version = AIFF;
 188     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
 189         return AVERROR_INVALIDDATA;
 190
 191     filesize -= 4;
 192
 193     st = av_new_stream(s, 0);
 194     if (!st)
 195         return AVERROR(ENOMEM);
 196
 197     while (filesize > 0) {
 198         /* parse different chunks */
 199         size = get_tag(pb, &tag);
 200         if (size < 0)
 201             return size;
 202
 203         filesize -= size + 8;
 204
 205         switch (tag) {
 206         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
 207             /* Then for the complete header info */
 208             st->nb_frames = get_aiff_header(pb, st->codec, size, version);
 209             if (st->nb_frames < 0)
 210                 return st->nb_frames;
 211             if (offset > 0) // COMM is after SSND
 212                 goto got_sound;
 213             break;
 214         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
 215             version = get_be32(pb);
 216             break;
 217         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
 218             get_meta(s, "title"    , size);
 219             break;
 220         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
 221             get_meta(s, "author"   , size);
 222             break;
 223         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
 224             get_meta(s, "copyright", size);
 225             break;
 226         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
 227             get_meta(s, "comment"  , size);
 228             break;
 229         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
 230             aiff->data_end = url_ftell(pb) + size;
 231             offset = get_be32(pb);      /* Offset of sound data */
 232             get_be32(pb);               /* BlockSize... don't care */
 233             offset += url_ftell(pb);    /* Compute absolute data offset */
 234             if (st->codec->block_align)    /* Assume COMM already parsed */
 235                 goto got_sound;
 236             if (url_is_streamed(pb)) {
 237                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
 238                 return -1;
 239             }
 240             url_fskip(pb, size - 8);
 241             break;
 242         case MKTAG('w', 'a', 'v', 'e'):
 243             if ((uint64_t)size > (1<<30))
 244                 return -1;
 245             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
 246             if (!st->codec->extradata)
 247                 return AVERROR(ENOMEM);
 248             st->codec->extradata_size = size;
 249             get_buffer(pb, st->codec->extradata, size);
 250             break;
 251         default: /* Jump */
 252             if (size & 1)   /* Always even aligned */
 253                 size++;
 254             url_fskip (pb, size);
 255         }
 256     }
 257
 258     if (!st->codec->block_align) {
 259         av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
 260         return -1;
 261     }
 262
 263 got_sound:
 264     /* Now positioned, get the sound data start and end */
 265     if (st->nb_frames)
 266         s->file_size = st->nb_frames * st->codec->block_align;
 267
 268     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 269     st->start_time = 0;
 270     st->duration = st->codec->frame_size ?
 271         st->nb_frames * st->codec->frame_size : st->nb_frames;
 272
 273     /* Position the stream at the first block */
 274     url_fseek(pb, offset, SEEK_SET);
 275
 276     return 0;
 277 }
 278
 279 #define MAX_SIZE 4096
 280
 281 static int aiff_read_packet(AVFormatContext *s,
 282                             AVPacket *pkt)
 283 {
 284     AVStream *st = s->streams[0];
 285     AIFFInputContext *aiff = s->priv_data;
 286     int64_t max_size;
 287     int res;
 288
 289     /* calculate size of remaining data */
 290     max_size = aiff->data_end - url_ftell(s->pb);
 291     if (max_size <= 0)
 292         return AVERROR_EOF;
 293
 294     /* Now for that packet */
 295     max_size = FFMIN(max_size, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
 296     res = av_get_packet(s->pb, pkt, max_size);
 297     if (res < 0)
 298         return res;
 299
 300     /* Only one stream in an AIFF file */
 301     pkt->stream_index = 0;
 302     return 0;
 303 }
 304
 305 AVInputFormat aiff_demuxer = {
 306     "aiff",
 307     NULL_IF_CONFIG_SMALL("Audio IFF"),
 308     sizeof(AIFFInputContext),
 309     aiff_probe,
 310     aiff_read_header,
 311     aiff_read_packet,
 312     NULL,
 313     pcm_read_seek,
 314     .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},
 315 };