apps/metadata/tta.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Yoshihisa Uchida
  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 #include "logf.h"
  32
  33 #define TTA1_SIGN    0x31415454
  34
  35 #define TTA_HEADER_ID              0
  36 #define TTA_HEADER_AUDIO_FORMAT    (TTA_HEADER_ID              + sizeof(unsigned int))
  37 #define TTA_HEADER_NUM_CHANNELS    (TTA_HEADER_AUDIO_FORMAT    + sizeof(unsigned short))
  38 #define TTA_HEADER_BITS_PER_SAMPLE (TTA_HEADER_NUM_CHANNELS    + sizeof(unsigned short))
  39 #define TTA_HEADER_SAMPLE_RATE     (TTA_HEADER_BITS_PER_SAMPLE + sizeof(unsigned short))
  40 #define TTA_HEADER_DATA_LENGTH     (TTA_HEADER_SAMPLE_RATE     + sizeof(unsigned int))
  41 #define TTA_HEADER_CRC32           (TTA_HEADER_DATA_LENGTH     + sizeof(unsigned int))
  42 #define TTA_HEADER_SIZE            (TTA_HEADER_CRC32           + sizeof(unsigned int))
  43
  44 #define TTA_HEADER_GETTER_ID(x)              get_long_le(x)
  45 #define TTA_HEADER_GETTER_AUDIO_FORMAT(x)    get_short_le(x)
  46 #define TTA_HEADER_GETTER_NUM_CHANNELS(x)    get_short_le(x)
  47 #define TTA_HEADER_GETTER_BITS_PER_SAMPLE(x) get_short_le(x)
  48 #define TTA_HEADER_GETTER_SAMPLE_RATE(x)     get_long_le(x)
  49 #define TTA_HEADER_GETTER_DATA_LENGTH(x)     get_long_le(x)
  50 #define TTA_HEADER_GETTER_CRC32(x)           get_long_le(x)
  51
  52 #define GET_HEADER(x, tag) TTA_HEADER_GETTER_ ## tag((x) + TTA_HEADER_ ## tag)
  53
  54 static void read_id3_tags(int fd, struct mp3entry* id3)
  55 {
  56     id3->title    = NULL;
  57     id3->filesize = filesize(fd);
  58     id3->id3v2len = getid3v2len(fd);
  59     id3->tracknum = 0;
  60     id3->discnum  = 0;
  61     id3->vbr      = false;   /* All TTA files are CBR */
  62
  63     /* first get id3v2 tags. if no id3v2 tags ware found, get id3v1 tags */
  64     if (id3->id3v2len)
  65     {
  66         setid3v2title(fd, id3);
  67         id3->first_frame_offset = id3->id3v2len;
  68         return;
  69     }
  70     setid3v1title(fd, id3);
  71 }
  72
  73 bool get_tta_metadata(int fd, struct mp3entry* id3)
  74 {
  75     unsigned char ttahdr[TTA_HEADER_SIZE];
  76     unsigned int datasize;
  77     unsigned int origsize;
  78     int bps;
  79
  80     lseek(fd, 0, SEEK_SET);
  81
  82     /* read id3 tags */
  83     read_id3_tags(fd, id3);
  84     lseek(fd, id3->id3v2len, SEEK_SET);
  85
  86     /* read TTA header */
  87     if (read(fd, ttahdr, TTA_HEADER_SIZE) < 0)
  88         return false;
  89
  90     /* check for TTA3 signature */
  91     if ((GET_HEADER(ttahdr, ID)) != TTA1_SIGN)
  92         return false;
  93
  94     /* skip check CRC */
  95
  96     id3->channels  = (GET_HEADER(ttahdr, NUM_CHANNELS));
  97     id3->frequency = (GET_HEADER(ttahdr, SAMPLE_RATE));
  98     id3->length    = ((GET_HEADER(ttahdr, DATA_LENGTH)) / id3->frequency) * 1000LL;
  99     bps            = (GET_HEADER(ttahdr, BITS_PER_SAMPLE));
 100
 101     datasize = id3->filesize - id3->first_frame_offset;
 102     origsize = (GET_HEADER(ttahdr, DATA_LENGTH)) * ((bps + 7) / 8) * id3->channels;
 103
 104     id3->bitrate = (int) ((uint64_t) datasize * id3->frequency * id3->channels * bps
 105                                                / (origsize * 1000LL));
 106
 107     /* output header info (for debug) */
 108     DEBUGF("TTA header info ----\n");
 109     DEBUGF("id:        %x\n",  (unsigned int)(GET_HEADER(ttahdr, ID)));
 110     DEBUGF("channels:  %d\n",  id3->channels);
 111     DEBUGF("frequency: %ld\n", id3->frequency);
 112     DEBUGF("length:    %ld\n", id3->length);
 113     DEBUGF("bitrate:   %d\n",  id3->bitrate);
 114     DEBUGF("bits per sample: %d\n", bps);
 115     DEBUGF("compressed size: %d\n", datasize);
 116     DEBUGF("original size:   %d\n", origsize);
 117     DEBUGF("id3----\n");
 118     DEBUGF("artist:  %s\n",  id3->artist);
 119     DEBUGF("title:   %s\n",  id3->title);
 120     DEBUGF("genre:   %s\n",  id3->genre_string);
 121
 122     return true;
 123 }