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 "libasap/asap.h"
  24
  25 CODEC_HEADER
  26
  27 #define CHUNK_SIZE (1024*2)
  28
  29 static byte samples[CHUNK_SIZE] IBSS_ATTR;   /* 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     int bytesPerSample =2;
  40
  41     /* Generic codec initialisation */
  42     ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512);
  43
  44 next_track:
  45     if (codec_init()) {
  46         DEBUGF("codec init failed\n");
  47         return CODEC_ERROR;
  48     }
  49
  50     while (!*ci->taginfo_ready && !ci->stop_codec)
  51         ci->sleep(1);
  52
  53     codec_set_replaygain(ci->id3);
  54
  55     int bytes_done =0;
  56     size_t filesize;
  57     ci->seek_buffer(0);
  58     module = ci->request_buffer(&filesize, ci->filesize);
  59     if (!module || (size_t)filesize < (size_t)ci->filesize)
  60     {
  61         DEBUGF("loading error\n");
  62         return CODEC_ERROR;
  63     }
  64
  65     /*Init ASAP */
  66     if (!ASAP_Load(&asap, ci->id3->path, module, filesize))
  67     {
  68         DEBUGF("%s: format not supported",ci->id3->path);
  69         return CODEC_ERROR;
  70     }
  71
  72       /* Make use of 44.1khz */
  73     ci->configure(DSP_SET_FREQUENCY, 44100);
  74     /* Sample depth is 16 bit little endian */
  75     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
  76     /* Stereo or Mono output ? */
  77     if(asap.module_info.channels ==1)
  78     {
  79         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
  80         bytesPerSample = 2;
  81     }
  82     else
  83     {
  84         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  85         bytesPerSample = 4;
  86     }
  87     /* reset eleapsed */
  88     ci->set_elapsed(0);
  89
  90     song = asap.module_info.default_song;
  91     duration = asap.module_info.durations[song];
  92     if (duration < 0)
  93         duration = 180 * 1000;
  94
  95     ASAP_PlaySong(&asap, song, duration);
  96     ASAP_MutePokeyChannels(&asap, 0);
  97
  98     /* The main decoder loop */
  99     while (1) {
 100         ci->yield();
 101         if (ci->stop_codec || ci->new_track)
 102             break;
 103
 104         if (ci->seek_time) {
 105             /* New time is ready in ci->seek_time */
 106
 107             /* seek to pos */
 108             ASAP_Seek(&asap,ci->seek_time);
 109             /* update elapsed */
 110             ci->set_elapsed(ci->seek_time);
 111             /* update bytes_done */
 112             bytes_done = ci->seek_time*44.1*2;
 113             /* seek ready */
 114             ci->seek_complete();
 115         }
 116
 117         /* Generate a buffer full of Audio */
 118         #ifdef ROCKBOX_LITTLE_ENDIAN
 119         n_bytes = ASAP_Generate(&asap, samples, sizeof(samples), ASAP_FORMAT_S16_LE);
 120         #else
 121         n_bytes = ASAP_Generate(&asap, samples, sizeof(samples), ASAP_FORMAT_S16_BE);
 122         #endif
 123
 124         ci->pcmbuf_insert(samples, NULL, n_bytes /bytesPerSample);
 125
 126         bytes_done += n_bytes;
 127         ci->set_elapsed((bytes_done / 2) / 44.1);
 128
 129         if(n_bytes != sizeof(samples))
 130             break;
 131     }
 132
 133     if (ci->request_next_track())
 134         goto next_track;
 135
 136     return CODEC_OK;
 137 }