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