apps/codecs/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
  22 #include "codeclib.h"
  23 #include "codecs/libtta/ttalib.h"
  24
  25 CODEC_HEADER
  26
  27 /*
  28  * TTA (True Audio) codec:
  29  *
  30  * References
  31  * [1] TRUE AUDIO CODEC SOFTWARE http://true-audio.com/
  32  */
  33
  34 static int32_t samples[PCM_BUFFER_LENGTH * 2] IBSS_ATTR;
  35
  36 /* this is the codec entry point */
  37 enum codec_status codec_main(void)
  38 {
  39     tta_info info;
  40     int status = CODEC_OK;
  41     unsigned int decodedsamples = 0;
  42     int endofstream;
  43     int new_pos = 0;
  44     int sample_count;
  45
  46     /* Generic codec initialisation */
  47     ci->configure(DSP_SET_SAMPLE_DEPTH, TTA_OUTPUT_DEPTH - 1);
  48
  49     if (codec_init())
  50     {
  51         DEBUGF("codec_init() error\n");
  52         status = CODEC_ERROR;
  53         goto exit;
  54     }
  55
  56 next_track:
  57     while (!*ci->taginfo_ready && !ci->stop_codec)
  58         ci->sleep(1);
  59
  60     if (set_tta_info(&info) < 0)
  61     {
  62         status = CODEC_ERROR;
  63         goto exit;
  64     }
  65     if (player_init(&info) < 0)
  66     {
  67         status = CODEC_ERROR;
  68         goto exit;
  69     }
  70
  71     codec_set_replaygain(ci->id3);
  72
  73     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  74     if (info.NCH == 2) {
  75         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  76     } else if (info.NCH == 1) {
  77         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
  78     } else {
  79         DEBUGF("CODEC_ERROR: more than 2 channels\n");
  80         status = CODEC_ERROR;
  81         goto done;
  82     }
  83
  84     /* The main decoder loop */
  85     endofstream = 0;
  86
  87     if (ci->id3->offset > 0)
  88     {
  89         /* Need to save offset for later use (cleared indirectly by advance_buffer) */
  90         new_pos = set_position(ci->id3->offset, TTA_SEEK_POS);
  91         if (new_pos >= 0)
  92             decodedsamples = new_pos;
  93         ci->seek_complete();
  94     }
  95
  96     while (!endofstream)
  97     {
  98         ci->yield();
  99         if (ci->stop_codec || ci->new_track)
 100             break;
 101
 102         if (ci->seek_time)
 103         {
 104             new_pos = set_position(ci->seek_time / SEEK_STEP, TTA_SEEK_TIME);
 105             if (new_pos >= 0)
 106             {
 107                 decodedsamples = new_pos;
 108                 ci->seek_complete();
 109             }
 110         }
 111
 112         sample_count = get_samples(samples);
 113         if (sample_count < 0)
 114         {
 115             status = CODEC_ERROR;
 116             break;
 117         }
 118         ci->pcmbuf_insert(samples, NULL, sample_count);
 119         decodedsamples += sample_count;
 120         if (decodedsamples >= info.DATALENGTH)
 121             endofstream = 1;
 122         ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
 123     }
 124     status = CODEC_OK;
 125 done:
 126     player_stop();
 127     if (ci->request_next_track())
 128         goto next_track;
 129
 130 exit:
 131     return status;
 132 }