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 numbytes = 0;
  42     int read_bytes;
  43     int i;
  44     bool is_aifc = false;
  45
  46     if ((lseek(fd, 0, SEEK_SET) < 0) ||
  47         ((read_bytes = read(fd, buf, sizeof(id3->path))) < 54) ||
  48         (memcmp(buf, "FORM", 4) != 0) || (memcmp(buf + 8, "AIF", 3) != 0) ||
  49         (!(is_aifc = (buf[11] == 'C')) && buf[11] != 'F'))
  50     {
  51         return false;
  52     }
  53
  54     i = 12;
  55     while ((numbytes == 0) && (read_bytes >= 8))
  56     {
  57         buf        += i;
  58         read_bytes -= i;
  59
  60         /* chunkSize */
  61         i = get_long_be(&buf[4]);
  62
  63         if (memcmp(buf, "COMM", 4) == 0)
  64         {
  65             /* numChannels */
  66             numChannels = ((buf[8]<<8)|buf[9]);
  67             /* numSampleFrames */
  68             numSampleFrames = get_long_be(&buf[10]);
  69             /* sampleRate */
  70             id3->frequency = get_long_be(&buf[18]);
  71             id3->frequency >>= (16+14-buf[17]);
  72             /* save format infos */
  73             id3->bitrate = (((buf[14]<<8)|buf[15]) * numChannels * id3->frequency) / 1000;
  74             if (!is_aifc || memcmp(&buf[26], AIFC_FORMAT_QT_IMA_ADPCM, 4) != 0)
  75                 id3->length = ((int64_t) numSampleFrames * 1000) / id3->frequency;
  76             else
  77             {
  78                 /* QuickTime IMA ADPCM is 1block = 64 data for each channel */
  79                 id3->length = ((int64_t) numSampleFrames * 64000LL) / id3->frequency;
  80             }
  81
  82             id3->vbr = false;   /* AIFF files are CBR */
  83             id3->filesize = filesize(fd);
  84         }
  85         else if (memcmp(buf, "SSND", 4) == 0)
  86         {
  87             numbytes = i - 8;
  88         }
  89
  90         /* odd chunk sizes must be padded */
  91         i += 8 + (i & 0x01);
  92     }
  93
  94     return ((numbytes != 0) && (numChannels != 0));
  95 }