157 lines
4.8 KiB
C
157 lines
4.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2009 Mohamed Tarek
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <string.h>
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#include "logf.h"
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#include "codeclib.h"
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#include "inttypes.h"
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#include "libatrac/atrac3.h"
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CODEC_HEADER
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#define FRAMESIZE ci->id3->bytesperframe
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#define BITRATE ci->id3->bitrate
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static ATRAC3Context q IBSS_ATTR;
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/* this is the codec entry point */
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enum codec_status codec_main(enum codec_entry_call_reason reason)
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{
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/* Nothing to do */
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return CODEC_OK;
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(void)reason;
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}
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/* this is called for each file to process */
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enum codec_status codec_run(void)
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{
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static size_t buff_size;
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int datasize, res, frame_counter, total_frames, seek_frame_offset;
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uint8_t *bit_buffer;
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int elapsed = 0;
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size_t resume_offset;
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intptr_t param;
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enum codec_command_action action;
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if (codec_init()) {
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DEBUGF("codec init failed\n");
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return CODEC_ERROR;
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}
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action = CODEC_ACTION_NULL;
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param = ci->id3->elapsed;
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resume_offset = ci->id3->offset;
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codec_set_replaygain(ci->id3);
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ci->memset(&q,0,sizeof(ATRAC3Context));
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ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
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ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
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ci->configure(DSP_SET_STEREO_MODE, ci->id3->channels == 1 ?
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STEREO_MONO : STEREO_NONINTERLEAVED);
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ci->seek_buffer(0);
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res = atrac3_decode_init(&q, ci->id3);
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if(res < 0) {
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DEBUGF("failed to initialize OMA atrac decoder\n");
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return CODEC_ERROR;
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}
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total_frames = (ci->id3->filesize - ci->id3->first_frame_offset) / FRAMESIZE;
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frame_counter = 0;
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/* check for a mid-track resume and force a seek time accordingly */
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if (resume_offset) {
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resume_offset -= MIN(resume_offset, ci->id3->first_frame_offset);
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/* calculate resume_offset in frames */
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param = (resume_offset/FRAMESIZE) * ((FRAMESIZE * 8)/BITRATE);
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}
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if ((unsigned long)param) {
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action = CODEC_ACTION_SEEK_TIME;
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}
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else {
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ci->set_elapsed(0);
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ci->seek_buffer(ci->id3->first_frame_offset);
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}
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/* The main decoder loop */
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while(frame_counter < total_frames)
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{
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if (action == CODEC_ACTION_NULL)
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action = ci->get_command(¶m);
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if (action == CODEC_ACTION_HALT)
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break;
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if (action == CODEC_ACTION_SEEK_TIME) {
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/* Do not allow seeking beyond the file's length */
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if ((unsigned long) param > ci->id3->length) {
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ci->set_elapsed(ci->id3->length);
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ci->seek_complete();
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break;
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}
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/* Seek to the start of the track */
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if (param == 0) {
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elapsed = 0;
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ci->set_elapsed(0);
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ci->seek_buffer(ci->id3->first_frame_offset);
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ci->seek_complete();
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action = CODEC_ACTION_NULL;
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continue;
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}
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seek_frame_offset = (param * BITRATE) / (8 * FRAMESIZE);
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frame_counter = seek_frame_offset;
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ci->seek_buffer(ci->id3->first_frame_offset + seek_frame_offset* FRAMESIZE);
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elapsed = param;
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ci->set_elapsed(elapsed);
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ci->seek_complete();
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}
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action = CODEC_ACTION_NULL;
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bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
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res = atrac3_decode_frame(FRAMESIZE, &q, &datasize, bit_buffer, FRAMESIZE);
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if(res != (int)FRAMESIZE) {
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DEBUGF("codec error\n");
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return CODEC_ERROR;
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}
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if(datasize)
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ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024,
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q.samples_per_frame / ci->id3->channels);
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elapsed += (FRAMESIZE * 8) / BITRATE;
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ci->set_elapsed(elapsed);
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ci->advance_buffer(FRAMESIZE);
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frame_counter++;
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}
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return CODEC_OK;
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}
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