apps/codecs/asap.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 Dominik Wenger
  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 "asap/asap.h"
  24
  25 CODEC_HEADER
  26
  27 #define CHUNK_SIZE (1024*8)
  28
  29 static byte samples[CHUNK_SIZE];   /* The sample buffer */
  30 static ASAP_State asap;         /* asap codec state */
  31
  32 /* this is the codec entry point */
  33 enum codec_status codec_main(void)
  34 {
  35     int n_bytes;
  36     int song;
  37     int duration;
  38     char* module;
  39
  40     /* Generic codec initialisation */
  41     ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512);
  42
  43 next_track:
  44     if (codec_init()) {
  45         DEBUGF("codec init failed\n");
  46         return CODEC_ERROR;
  47     }
  48
  49     while (!*ci->taginfo_ready && !ci->stop_codec)
  50         ci->sleep(1);
  51
  52     codec_set_replaygain(ci->id3);
  53
  54     int bytes_done =0;
  55     int filesize;
  56     ci->seek_buffer(0);
  57     module = ci->request_buffer(&filesize, ci->filesize);
  58     if (!module || (size_t)filesize < (size_t)ci->filesize)
  59     {
  60         DEBUGF("loading error\n");
  61         return CODEC_ERROR;
  62     }
  63
  64     /*Init ASAP */
  65     if (!ASAP_Load(&asap, ci->id3->path, module, filesize))
  66     {
  67         DEBUGF("%s: format not supported",ci->id3->path);
  68         return CODEC_ERROR;
  69     }
  70
  71       /* Make use of 44.1khz */
  72     ci->configure(DSP_SET_FREQUENCY, 44100);
  73     /* Sample depth is 16 bit little endian */
  74     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
  75     /* Stereo or Mono output ? */
  76     if(asap.module_info.channels ==1)
  77         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
  78     else
  79         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  80
  81     /* reset eleapsed */
  82     ci->set_elapsed(0);
  83
  84     song = asap.module_info.default_song;
  85     duration = asap.module_info.durations[song];
  86     if (duration < 0)
  87         duration = 180 * 1000;
  88
  89     ASAP_PlaySong(&asap, song, duration);
  90     ASAP_MutePokeyChannels(&asap, 0);
  91
  92     /* The main decoder loop */
  93     while (1) {
  94         ci->yield();
  95         if (ci->stop_codec || ci->new_track)
  96             break;
  97
  98         if (ci->seek_time) {
  99             /* New time is ready in ci->seek_time */
 100
 101             /* seek to pos */
 102             ASAP_Seek(&asap,ci->seek_time);
 103             /* update elapsed */
 104             ci->set_elapsed(ci->seek_time);
 105             /* update bytes_done */
 106             bytes_done = ci->seek_time*44.1*2;
 107             /* seek ready */
 108             ci->seek_complete();
 109         }
 110
 111         /* Generate a buffer full of Audio */
 112         #ifdef ROCKBOX_LITTLE_ENDIAN
 113         n_bytes = ASAP_Generate(&asap, samples, sizeof(samples), ASAP_FORMAT_S16_LE);
 114         #else
 115         n_bytes = ASAP_Generate(&asap, samples, sizeof(samples), ASAP_FORMAT_S16_BE);
 116         #endif
 117
 118         ci->pcmbuf_insert(samples, NULL, n_bytes /2);
 119
 120         bytes_done += n_bytes;
 121         ci->set_elapsed((bytes_done / 2) / 44.1);
 122
 123         if(n_bytes != sizeof(samples))
 124             break;
 125     }
 126
 127     if (ci->request_next_track())
 128         goto next_track;
 129
 130     return CODEC_OK;
 131 }