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(enum codec_entry_call_reason reason)
  38 {
  39     /* Nothing to do */
  40     return CODEC_OK;
  41     (void)reason;
  42 }
  43
  44 /* this is called for each file to process */
  45 enum codec_status codec_run(void)
  46 {
  47     static size_t buff_size;
  48     int datasize, res, frame_counter, total_frames, seek_frame_offset;
  49     uint8_t *bit_buffer;
  50     int elapsed = 0;
  51     size_t resume_offset;
  52     intptr_t param;
  53     enum codec_command_action action = CODEC_ACTION_NULL;
  54
  55     if (codec_init()) {
  56         DEBUGF("codec init failed\n");
  57         return CODEC_ERROR;
  58     }
  59
  60     resume_offset = ci->id3->offset;
  61
  62     codec_set_replaygain(ci->id3);
  63     ci->memset(&q,0,sizeof(ATRAC3Context));
  64
  65     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  66     ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
  67     ci->configure(DSP_SET_STEREO_MODE, ci->id3->channels == 1 ?
  68         STEREO_MONO : STEREO_NONINTERLEAVED);
  69
  70     ci->seek_buffer(0);
  71
  72     res = atrac3_decode_init(&q, ci->id3);
  73     if(res < 0) {
  74         DEBUGF("failed to initialize OMA atrac decoder\n");
  75         return CODEC_ERROR;
  76     }
  77
  78     total_frames = (ci->id3->filesize - ci->id3->first_frame_offset) / FRAMESIZE;
  79     frame_counter = 0;
  80
  81     /* check for a mid-track resume and force a seek time accordingly */
  82     if(resume_offset > ci->id3->first_frame_offset) {
  83         resume_offset -= ci->id3->first_frame_offset;
  84         /* calculate resume_offset in frames */
  85         resume_offset = (int)resume_offset / FRAMESIZE;
  86         param = (int)resume_offset * ((FRAMESIZE * 8)/BITRATE);
  87         action = CODEC_ACTION_SEEK_TIME;
  88     }
  89     else {
  90         ci->set_elapsed(0);
  91         ci->seek_buffer(ci->id3->first_frame_offset);
  92     }
  93
  94     /* The main decoder loop */
  95     while(frame_counter < total_frames)
  96     {
  97         if (action == CODEC_ACTION_NULL)
  98             action = ci->get_command(&param);
  99
 100         if (action == CODEC_ACTION_HALT)
 101             break;
 102
 103         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
 104
 105         if (action == CODEC_ACTION_SEEK_TIME) {
 106             /* Do not allow seeking beyond the file's length */
 107             if ((unsigned) param > ci->id3->length) {
 108                 ci->set_elapsed(ci->id3->length);
 109                 ci->seek_complete();
 110                 break;
 111             }
 112
 113             /* Seek to the start of the track */
 114             if (param == 0) {
 115                 elapsed = 0;
 116                 ci->set_elapsed(0);
 117                 ci->seek_buffer(ci->id3->first_frame_offset);
 118                 ci->seek_complete();
 119                 action = CODEC_ACTION_NULL;
 120                 continue;
 121             }
 122
 123             seek_frame_offset = (param * BITRATE) / (8 * FRAMESIZE);
 124             frame_counter = seek_frame_offset;
 125             ci->seek_buffer(ci->id3->first_frame_offset + seek_frame_offset* FRAMESIZE);
 126             bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
 127             elapsed = param;
 128             ci->set_elapsed(elapsed);
 129             ci->seek_complete();
 130         }
 131
 132         action = CODEC_ACTION_NULL;
 133
 134         res = atrac3_decode_frame(FRAMESIZE, &q, &datasize, bit_buffer, FRAMESIZE);
 135
 136         if(res != (int)FRAMESIZE) {
 137             DEBUGF("codec error\n");
 138             return CODEC_ERROR;
 139         }
 140
 141         if(datasize)
 142             ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024,
 143                               q.samples_per_frame / ci->id3->channels);
 144
 145         elapsed += (FRAMESIZE * 8) / BITRATE;
 146         ci->set_elapsed(elapsed);
 147
 148         ci->advance_buffer(FRAMESIZE);
 149         frame_counter++;
 150     }
 151
 152     return CODEC_OK;
 153 }