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;
  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     status = CODEC_OK;
  51
  52     if (codec_init())
  53     {
  54         DEBUGF("codec_init() error\n");
  55         status = CODEC_ERROR;
  56         goto exit;
  57     }
  58
  59     if (codec_wait_taginfo() != 0)
  60         goto done;
  61
  62     if (set_tta_info(&info) < 0 || player_init(&info) < 0)
  63     {
  64         status = CODEC_ERROR;
  65         goto exit;
  66     }
  67
  68     codec_set_replaygain(ci->id3);
  69
  70     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  71     if (info.NCH == 2) {
  72         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  73     } else if (info.NCH == 1) {
  74         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
  75     } else {
  76         DEBUGF("CODEC_ERROR: more than 2 channels\n");
  77         status = CODEC_ERROR;
  78         goto done;
  79     }
  80
  81     /* The main decoder loop */
  82     decodedsamples = 0;
  83     endofstream = 0;
  84
  85     if (ci->id3->offset > 0)
  86     {
  87         /* Need to save offset for later use (cleared indirectly by advance_buffer) */
  88         new_pos = set_position(ci->id3->offset, TTA_SEEK_POS);
  89         if (new_pos >= 0)
  90             decodedsamples = new_pos;
  91         ci->seek_complete();
  92     }
  93
  94     while (!endofstream)
  95     {
  96         ci->yield();
  97         if (ci->stop_codec || ci->new_track)
  98             break;
  99
 100         if (ci->seek_time)
 101         {
 102             new_pos = set_position(ci->seek_time / SEEK_STEP, TTA_SEEK_TIME);
 103             if (new_pos >= 0)
 104             {
 105                 decodedsamples = new_pos;
 106                 ci->seek_complete();
 107             }
 108         }
 109
 110         sample_count = get_samples(samples);
 111         if (sample_count < 0)
 112         {
 113             status = CODEC_ERROR;
 114             break;
 115         }
 116         ci->pcmbuf_insert(samples, NULL, sample_count);
 117         decodedsamples += sample_count;
 118         if (decodedsamples >= info.DATALENGTH)
 119             endofstream = 1;
 120         ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
 121     }
 122
 123 done:
 124     player_stop();
 125     if (ci->request_next_track())
 126         goto next_track;
 127
 128 exit:
 129     return status;
 130 }