text: /***************************************************************************
   *             __________               __   ___.
   *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   *                     \/            \/     \/    \/            \/
   * $Id$
   *
   * Copyright (C) 2010 Yoshihisa Uchida
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ****************************************************************************/
  
  #include "codeclib.h"
  #include "codecs/libtta/ttalib.h"
  
  CODEC_HEADER
  
  /*
   * TTA (True Audio) codec:
   *
   * References
   * [1] TRUE AUDIO CODEC SOFTWARE http://true-audio.com/
   */
  
  static int32_t samples[PCM_BUFFER_LENGTH * 2] IBSS_ATTR;
  
  /* this is the codec entry point */
  enum codec_status codec_main(enum codec_entry_call_reason reason)
  {
      if (reason == CODEC_LOAD) {
          /* Generic codec initialisation */
          ci->configure(DSP_SET_SAMPLE_DEPTH, TTA_OUTPUT_DEPTH - 1);
      }
  
      return CODEC_OK;
  }
  
  /* this is called for each file to process */
  enum codec_status codec_run(void)
  {
      tta_info info;
      unsigned int decodedsamples;
      int endofstream;
      int new_pos = 0;
      int sample_count;
      intptr_t param;
    
      if (codec_init())
      {
          DEBUGF("codec_init() error\n");
          return CODEC_ERROR;
      }
  
      ci->seek_buffer(0);
  
      if (set_tta_info(&info) < 0 || player_init(&info) < 0)
          return CODEC_ERROR;
  
      codec_set_replaygain(ci->id3);
  
      ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
      if (info.NCH == 2) {
          ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
      } else if (info.NCH == 1) {
          ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
      } else {
          DEBUGF("CODEC_ERROR: more than 2 channels\n");
          player_stop();
          return CODEC_ERROR;
      }
  
      /* The main decoder loop */
      decodedsamples = 0;
      endofstream = 0;
  
      if (ci->id3->offset || ci->id3->elapsed)
      {
          /* Need to save offset for later use (cleared indirectly by
             advance_buffer) */
          unsigned int pos = ci->id3->offset;
          enum tta_seek_type type = TTA_SEEK_POS;
  
          if (!pos) {
              pos = ci->id3->elapsed / SEEK_STEP;
              type = TTA_SEEK_TIME;
          }
  
          new_pos = set_position(pos, type);
  
          if (new_pos >= 0)
              decodedsamples = new_pos;
      }
  
      ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
  
      while (!endofstream)
      {
          enum codec_command_action action = ci->get_command(&param);
  
          if (action == CODEC_ACTION_HALT)
              break;
  
          if (action == CODEC_ACTION_SEEK_TIME)
          {
              new_pos = set_position(param / SEEK_STEP, TTA_SEEK_TIME);
              if (new_pos >= 0)
              {
                  decodedsamples = new_pos;
              }
  
              ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
              ci->seek_complete();
          }
  
          sample_count = get_samples(samples);
          if (sample_count < 0)
              break;
   
          ci->pcmbuf_insert(samples, NULL, sample_count);
          decodedsamples += sample_count;
          if (decodedsamples >= info.DATALENGTH)
              endofstream = 1;
          ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
      }
  
      player_stop();
      return CODEC_OK;
  }
  