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 /* compressionType: AIFC QuickTime IMA ADPCM */
  33 #define AIFC_FORMAT_QT_IMA_ADPCM "ima4"
  34
  35 bool get_aiff_metadata(int fd, struct mp3entry* id3)
  36 {
  37     /* Use the trackname part of the id3 structure as a temporary buffer */
  38     unsigned char* buf = (unsigned char *)id3->path;
  39     unsigned long numChannels = 0;
  40     unsigned long numSampleFrames = 0;
  41     unsigned long sampleSize = 0;
  42     unsigned long sampleRate = 0;
  43     unsigned long numbytes = 0;
  44     int read_bytes;
  45     int i;
  46     bool is_aifc = false;
  47
  48     if ((lseek(fd, 0, SEEK_SET) < 0)
  49         || ((read_bytes = read(fd, buf, sizeof(id3->path))) < 54))
  50     {
  51         return false;
  52     }
  53
  54     if (memcmp(buf, "FORM",4) != 0)
  55         return false;
  56
  57     if (memcmp(&buf[8], "AIFF", 4) != 0)
  58     {
  59         if (memcmp(&buf[8], "AIFC", 4) != 0)
  60             return false;
  61
  62         is_aifc = true;
  63     }
  64
  65     buf += 12;
  66     read_bytes -= 12;
  67
  68     while ((numbytes == 0) && (read_bytes >= 8))
  69     {
  70         /* chunkSize */
  71         i = get_long_be(&buf[4]);
  72
  73         if (memcmp(buf, "COMM", 4) == 0)
  74         {
  75             /* numChannels */
  76             numChannels = ((buf[8]<<8)|buf[9]);
  77             /* numSampleFrames */
  78             numSampleFrames = get_long_be(&buf[10]);
  79             /* sampleSize */
  80             sampleSize = ((buf[14]<<8)|buf[15]);
  81             /* sampleRate */
  82             sampleRate = get_long_be(&buf[18]);
  83             sampleRate = sampleRate >> (16+14-buf[17]);
  84             /* save format infos */
  85             id3->bitrate = (sampleSize * numChannels * sampleRate) / 1000;
  86             id3->frequency = sampleRate;
  87             if (!is_aifc || memcmp(&buf[26], AIFC_FORMAT_QT_IMA_ADPCM, 4) != 0)
  88                 id3->length = ((int64_t) numSampleFrames * 1000) / id3->frequency;
  89             else
  90             {
  91                 /* QuickTime IMA ADPCM is 1block = 64 data for each channel */
  92                 id3->length = (int64_t)(numSampleFrames * 64000LL) / id3->frequency;
  93             }
  94
  95             id3->vbr = false;   /* AIFF files are CBR */
  96             id3->filesize = filesize(fd);
  97         }
  98         else if (memcmp(buf, "SSND", 4) == 0)
  99         {
 100             numbytes = i - 8;
 101         }
 102
 103         if (i & 0x01)
 104         {
 105             i++;  /* odd chunk sizes must be padded */
 106         }
 107         buf += i + 8;
 108         read_bytes -= i + 8;
 109     }
 110
 111     if ((numbytes == 0) || (numChannels == 0))
 112     {
 113         return false;
 114     }
 115     return true;
 116 }