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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Thom Johansen
*
* 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 "codeclib.h"
#include <codecs/libmusepack/musepack.h>
CODEC_HEADER
mpc_decoder decoder IBSS_ATTR;
/* Our implementations of the mpc_reader callback functions. */
mpc_int32_t read_impl(void *data, void *ptr, mpc_int32_t size)
{
struct codec_api *ci = (struct codec_api *)data;
return ((mpc_int32_t)(ci->read_filebuf(ptr, size)));
}
mpc_bool_t seek_impl(void *data, mpc_int32_t offset)
{
struct codec_api *ci = (struct codec_api *)data;
/* WARNING: assumes we don't need to skip too far into the past,
this might not be supported by the buffering layer yet */
return ci->seek_buffer(offset);
}
mpc_int32_t tell_impl(void *data)
{
struct codec_api *ci = (struct codec_api *)data;
return ci->curpos;
}
mpc_int32_t get_size_impl(void *data)
{
struct codec_api *ci = (struct codec_api *)data;
return ci->filesize;
}
mpc_bool_t canseek_impl(void *data)
{
(void)data;
/* doesn't much matter, libmusepack ignores this anyway */
return true;
}
MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH]
IBSS_ATTR_MPC_SAMPLE_BUF;
/* this is the codec entry point */
enum codec_status codec_main(void)
{
mpc_int64_t samplesdone;
unsigned long frequency;
unsigned status;
mpc_reader reader;
mpc_streaminfo info;
int retval = CODEC_OK;
/* musepack's sample representation is 18.14
* DSP_SET_SAMPLE_DEPTH = 14 (FRACT) + 16 (NATIVE) - 1 (SIGN) = 29 */
ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
/* Create a decoder instance */
reader.read = read_impl;
reader.seek = seek_impl;
reader.tell = tell_impl;
reader.get_size = get_size_impl;
reader.canseek = canseek_impl;
reader.data = ci;
next_track:
if (codec_init()) {
retval = CODEC_ERROR;
goto exit;
}
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
samplesdone = ci->id3->offset;
/* read file's streaminfo data */
mpc_streaminfo_init(&info);
if (mpc_streaminfo_read(&info, &reader) != ERROR_CODE_OK) {
retval = CODEC_ERROR;
goto done;
}
frequency = info.sample_freq / 1000;
ci->configure(DSP_SWITCH_FREQUENCY, info.sample_freq);
/* set playback engine up for correct number of channels */
/* NOTE: current musepack format only allows for stereo files
but code is here to handle other configurations anyway */
if (info.channels == 2)
ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
else if (info.channels == 1)
ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
else {
retval = CODEC_ERROR;
goto done;
}
codec_set_replaygain(ci->id3);
/* instantiate a decoder with our file reader */
mpc_decoder_setup(&decoder, &reader);
if (!mpc_decoder_initialize(&decoder, &info)) {
retval = CODEC_ERROR;
goto done;
}
/* Resume to saved sample offset. */
if(samplesdone > 0) {
/* hack to improve seek time if filebuf goes empty */
if (mpc_decoder_seek_sample(&decoder, samplesdone)) {
ci->set_elapsed(samplesdone/frequency);
} else {
samplesdone = 0;
}
/* reset chunksize */
}
/* This is the decoding loop. */
do {
#if 1
/* Complete seek handler. */
if (ci->seek_time) {
/* hack to improve seek time if filebuf goes empty */
mpc_int64_t new_offset = (ci->seek_time - 1)*frequency;
if (mpc_decoder_seek_sample(&decoder, new_offset)) {
samplesdone = new_offset;
ci->set_elapsed(ci->seek_time);
}
ci->seek_complete();
/* reset chunksize */
}
#else
/* Seek to start of track handler. */
if (ci->seek_time) {
if (ci->seek_time == 1 && mpc_decoder_seek_sample(&decoder, 0)) {
samplesdone = 0;
ci->set_elapsed(0);
}
ci->seek_complete();
}
#endif
if (ci->stop_codec || ci->new_track)
break;
status = mpc_decoder_decode(&decoder, sample_buffer, NULL, NULL);
ci->yield();
if (status == 0) /* end of file reached */
goto done;
if (status == (unsigned)(-1)) { /* decode error */
retval = CODEC_ERROR;
goto done;
} else {
ci->pcmbuf_insert(sample_buffer,
sample_buffer + MPC_FRAME_LENGTH,
status);
samplesdone += status;
ci->set_elapsed(samplesdone/frequency);
ci->set_offset(samplesdone);
}
} while (status != 0);
retval = CODEC_OK;
done:
if (ci->request_next_track())
goto next_track;
exit:
return retval;
}
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