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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 Mohamed Tarek
*
* 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 <string.h>
#include "logf.h"
#include "codeclib.h"
#include "inttypes.h"
#include "libatrac/atrac3.h"
CODEC_HEADER
#define FRAMESIZE ci->id3->bytesperframe
#define BITRATE ci->id3->bitrate
ATRAC3Context q IBSS_ATTR;
/* this is the codec entry point */
enum codec_status codec_main(void)
{
static size_t buff_size;
int datasize, res, frame_counter, total_frames, seek_frame_offset;
uint8_t *bit_buffer;
int elapsed = 0;
size_t resume_offset = ci->id3->offset;
next_track:
if (codec_init()) {
DEBUGF("codec init failed\n");
return CODEC_ERROR;
}
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
codec_set_replaygain(ci->id3);
ci->memset(&q,0,sizeof(ATRAC3Context));
ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
ci->configure(DSP_SET_STEREO_MODE, ci->id3->channels == 1 ?
STEREO_MONO : STEREO_NONINTERLEAVED);
res =atrac3_decode_init(&q, ci->id3);
if(res < 0) {
DEBUGF("failed to initialize atrac decoder\n");
return CODEC_ERROR;
}
/* check for a mid-track resume and force a seek time accordingly */
if(resume_offset > ci->id3->first_frame_offset) {
resume_offset -= ci->id3->first_frame_offset;
/* calculate resume_offset in frames */
resume_offset = (int)resume_offset / FRAMESIZE;
ci->seek_time = (int)resume_offset * ((FRAMESIZE * 8)/BITRATE);
}
total_frames = (ci->id3->filesize - ci->id3->first_frame_offset) / FRAMESIZE;
frame_counter = 0;
ci->set_elapsed(0);
ci->advance_buffer(ci->id3->first_frame_offset);
/* The main decoder loop */
seek_start :
while(frame_counter < total_frames)
{
bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
ci->yield();
if (ci->stop_codec || ci->new_track)
goto done;
if (ci->seek_time) {
ci->set_elapsed(ci->seek_time);
/* Do not allow seeking beyond the file's length */
if ((unsigned) ci->seek_time > ci->id3->length) {
ci->seek_complete();
goto done;
}
/* Seek to the start of the track */
if (ci->seek_time == 1) {
ci->set_elapsed(0);
ci->seek_complete();
ci->seek_buffer(ci->id3->first_frame_offset);
elapsed = 0;
goto seek_start;
}
seek_frame_offset = (ci->seek_time * BITRATE) / (8 * FRAMESIZE);
frame_counter = seek_frame_offset;
ci->seek_buffer(ci->id3->first_frame_offset + seek_frame_offset* FRAMESIZE);
bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
elapsed = ci->seek_time;
ci->set_elapsed(elapsed);
ci->seek_complete();
}
res = atrac3_decode_frame(FRAMESIZE, &q, &datasize, bit_buffer, FRAMESIZE);
if(res != (int)FRAMESIZE) {
DEBUGF("codec error\n");
return CODEC_ERROR;
}
if(datasize)
ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024, q.samples_per_frame / ci->id3->channels);
elapsed += (FRAMESIZE * 8) / BITRATE;
ci->set_elapsed(elapsed);
ci->advance_buffer(FRAMESIZE);
frame_counter++;
}
done:
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
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