apps/codecs/atrac3_oma.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2009 Mohamed Tarek
  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 <string.h>
  23
  24 #include "logf.h"
  25 #include "codeclib.h"
  26 #include "inttypes.h"
  27 #include "libatrac/atrac3.h"
  28
  29 CODEC_HEADER
  30
  31 #define FRAMESIZE ci->id3->bytesperframe
  32 #define BITRATE   ci->id3->bitrate
  33
  34 static ATRAC3Context q IBSS_ATTR;
  35
  36 /* this is the codec entry point */
  37 enum codec_status codec_main(void)
  38 {
  39     static size_t buff_size;
  40     int datasize, res, frame_counter, total_frames, seek_frame_offset;
  41     uint8_t *bit_buffer;
  42     int elapsed = 0;
  43     size_t resume_offset = ci->id3->offset;
  44
  45 next_track:
  46     if (codec_init()) {
  47         DEBUGF("codec init failed\n");
  48         return CODEC_ERROR;
  49     }
  50     while (!*ci->taginfo_ready && !ci->stop_codec)
  51         ci->sleep(1);
  52
  53     codec_set_replaygain(ci->id3);
  54     ci->memset(&q,0,sizeof(ATRAC3Context));
  55
  56     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  57     ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
  58     ci->configure(DSP_SET_STEREO_MODE, ci->id3->channels == 1 ?
  59         STEREO_MONO : STEREO_NONINTERLEAVED);
  60
  61     res =atrac3_decode_init(&q, ci->id3);
  62     if(res < 0) {
  63         DEBUGF("failed to initialize OMA atrac decoder\n");
  64         return CODEC_ERROR;
  65     }
  66
  67     /* check for a mid-track resume and force a seek time accordingly */
  68     if(resume_offset > ci->id3->first_frame_offset) {
  69         resume_offset -= ci->id3->first_frame_offset;
  70         /* calculate resume_offset in frames */
  71         resume_offset = (int)resume_offset / FRAMESIZE;
  72         ci->seek_time =  (int)resume_offset * ((FRAMESIZE * 8)/BITRATE);
  73     }
  74     total_frames = (ci->id3->filesize - ci->id3->first_frame_offset) / FRAMESIZE;
  75     frame_counter = 0;
  76
  77     ci->set_elapsed(0);
  78     ci->seek_buffer(0);
  79     ci->advance_buffer(ci->id3->first_frame_offset);
  80
  81     /* The main decoder loop */
  82 seek_start :
  83     while(frame_counter < total_frames)
  84     {
  85         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
  86
  87         ci->yield();
  88         if (ci->stop_codec || ci->new_track)
  89             goto done;
  90
  91             if (ci->seek_time) {
  92                 ci->set_elapsed(ci->seek_time);
  93
  94                 /* Do not allow seeking beyond the file's length */
  95                 if ((unsigned) ci->seek_time > ci->id3->length) {
  96                     ci->seek_complete();
  97                     goto done;
  98                 }
  99
 100                 /* Seek to the start of the track */
 101                 if (ci->seek_time == 1) {
 102                     ci->set_elapsed(0);
 103                     ci->seek_complete();
 104                     ci->seek_buffer(ci->id3->first_frame_offset);
 105                     elapsed = 0;
 106                     goto seek_start;
 107                 }
 108                 seek_frame_offset = (ci->seek_time * BITRATE) / (8 * FRAMESIZE);
 109                 frame_counter = seek_frame_offset;
 110                 ci->seek_buffer(ci->id3->first_frame_offset + seek_frame_offset* FRAMESIZE);
 111                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
 112                 elapsed = ci->seek_time;
 113
 114                 ci->set_elapsed(elapsed);
 115                 ci->seek_complete();
 116             }
 117
 118             res = atrac3_decode_frame(FRAMESIZE, &q, &datasize, bit_buffer, FRAMESIZE);
 119
 120             if(res != (int)FRAMESIZE) {
 121                 DEBUGF("codec error\n");
 122                 return CODEC_ERROR;
 123             }
 124
 125             if(datasize)
 126                 ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024, q.samples_per_frame / ci->id3->channels);
 127
 128             elapsed += (FRAMESIZE * 8) / BITRATE;
 129             ci->set_elapsed(elapsed);
 130
 131             ci->advance_buffer(FRAMESIZE);
 132             frame_counter++;
 133     }
 134
 135     done:
 136     if (ci->request_next_track())
 137         goto next_track;
 138
 139     return CODEC_OK;
 140 }