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;
  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 next_track:
  50     if (codec_init())
  51     {
  52         DEBUGF("codec_init() error\n");
  53         status = CODEC_ERROR;
  54         goto exit;
  55     }
  56
  57     while (!*ci->taginfo_ready && !ci->stop_codec)
  58         ci->sleep(1);
  59
  60     if (set_tta_info(&info) < 0 || player_init(&info) < 0)
  61     {
  62         status = CODEC_ERROR;
  63         goto exit;
  64     }
  65
  66     codec_set_replaygain(ci->id3);
  67
  68     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  69     if (info.NCH == 2) {
  70         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  71     } else if (info.NCH == 1) {
  72         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
  73     } else {
  74         DEBUGF("CODEC_ERROR: more than 2 channels\n");
  75         status = CODEC_ERROR;
  76         goto done;
  77     }
  78
  79     /* The main decoder loop */
  80     decodedsamples = 0;
  81     endofstream = 0;
  82
  83     if (ci->id3->offset > 0)
  84     {
  85         /* Need to save offset for later use (cleared indirectly by advance_buffer) */
  86         new_pos = set_position(ci->id3->offset, TTA_SEEK_POS);
  87         if (new_pos >= 0)
  88             decodedsamples = new_pos;
  89         ci->seek_complete();
  90     }
  91
  92     while (!endofstream)
  93     {
  94         ci->yield();
  95         if (ci->stop_codec || ci->new_track)
  96             break;
  97
  98         if (ci->seek_time)
  99         {
 100             new_pos = set_position(ci->seek_time / SEEK_STEP, TTA_SEEK_TIME);
 101             if (new_pos >= 0)
 102             {
 103                 decodedsamples = new_pos;
 104                 ci->seek_complete();
 105             }
 106         }
 107
 108         sample_count = get_samples(samples);
 109         if (sample_count < 0)
 110         {
 111             status = CODEC_ERROR;
 112             break;
 113         }
 114         ci->pcmbuf_insert(samples, NULL, sample_count);
 115         decodedsamples += sample_count;
 116         if (decodedsamples >= info.DATALENGTH)
 117             endofstream = 1;
 118         ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
 119     }
 120     status = CODEC_OK;
 121 done:
 122     player_stop();
 123     if (ci->request_next_track())
 124         goto next_track;
 125
 126 exit:
 127     return status;
 128 }