apps/metadata/aiff.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Dave Chapman
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <ctype.h>
  25 #include <inttypes.h>
  26
  27 #include "system.h"
  28 #include "metadata.h"
  29 #include "metadata_common.h"
  30 #include "metadata_parsers.h"
  31
  32 #include "debug.h"
  33
  34 /* compressionType: AIFC QuickTime IMA ADPCM */
  35 #define AIFC_FORMAT_QT_IMA_ADPCM "ima4"
  36
  37 bool get_aiff_metadata(int fd, struct mp3entry* id3)
  38 {
  39     unsigned char buf[512];
  40     unsigned long numChannels = 0;
  41     unsigned long numSampleFrames = 0;
  42     unsigned long numbytes = 0;
  43     int read_bytes;
  44     bool is_aifc = false;
  45
  46     if ((lseek(fd, 0, SEEK_SET) < 0) || (read(fd, &buf[0], 12) < 12) ||
  47         (memcmp(&buf[0], "FORM", 4) != 0) || (memcmp(&buf[8], "AIF", 3) != 0) ||
  48         (!(is_aifc = (buf[11] == 'C')) && buf[11] != 'F'))
  49     {
  50         return false;
  51     }
  52
  53     while((read_bytes = read(fd, &buf[0], 8)) == 8)
  54     {
  55         size_t size = get_long_be(&buf[4]); /* chunkSize */
  56
  57         if (memcmp(&buf[0], "SSND", 4) == 0)
  58         {
  59             numbytes = size - 8;
  60             break;  /* assume COMM was already read */
  61         }
  62
  63         /* odd chunk sizes must be padded */
  64         size += size & 1;
  65
  66         if (size > sizeof(buf))
  67         {
  68             DEBUGF("AIFF \"%4.4s\" chunk too large (%zd > %zd)",
  69                     (char*) &buf[0], size, sizeof(buf));
  70         }
  71
  72         if (memcmp(&buf[0], "COMM", 4) == 0)
  73         {
  74             if (size > sizeof(buf) || read(fd, &buf[0], size) != (ssize_t)size)
  75                 return false;
  76
  77             numChannels = ((buf[0]<<8)|buf[1]);
  78
  79             numSampleFrames = get_long_be(&buf[2]);
  80
  81             /* sampleRate */
  82             id3->frequency = get_long_be(&buf[10]);
  83             id3->frequency >>= (16+14-buf[9]);
  84
  85             /* save format infos */
  86             id3->bitrate = ((buf[6]<<8)|buf[7]) * numChannels * id3->frequency;
  87             id3->bitrate /= 1000;
  88
  89             if (!is_aifc || memcmp(&buf[18], AIFC_FORMAT_QT_IMA_ADPCM, 4) != 0)
  90                 id3->length = ((int64_t) numSampleFrames * 1000) / id3->frequency;
  91             else
  92             {
  93                 /* QuickTime IMA ADPCM is 1block = 64 data for each channel */
  94                 id3->length = ((int64_t) numSampleFrames * 64000LL) / id3->frequency;
  95             }
  96
  97             id3->vbr = false;   /* AIFF files are CBR */
  98             id3->filesize = filesize(fd);
  99         }
 100         else
 101         {
 102             /* skip chunk */
 103             if (lseek(fd, size, SEEK_CUR) < 0)
 104                 return false;
 105         }
 106     }
 107
 108     return numbytes && numChannels;
 109 }