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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Thom Johansen
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "codec.h"
#include "playback.h"
#include "lib/codeclib.h"
#include <codecs/libmusepack/musepack.h>
mpc_decoder decoder;
/* 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)));
}
bool 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;
}
bool canseek_impl(void *data)
{
(void)data;
/* doesn't much matter, libmusepack ignores this anyway */
return true;
}
inline int shift_signed(MPC_SAMPLE_FORMAT val, int shift)
{
if (shift > 0)
val <<= shift;
else if (shift < 0)
val >>= -shift;
return (int)val;
}
#define OUTPUT_BUFFER_SIZE 65536 /* Must be an integer multiple of 4. */
unsigned char OutputBuffer[OUTPUT_BUFFER_SIZE];
/* temporary, we probably have better use for iram than this */
MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH] IDATA_ATTR;
unsigned char *OutputPtr;
const unsigned char *OutputBufferEnd;
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api *api)
{
struct codec_api *ci = api;
unsigned short Sample;
unsigned long samplesdone;
unsigned long frequency;
unsigned status = 1;
unsigned int i;
mpc_reader reader;
/* Generic codec inititialisation */
TEST_CODEC_API(api);
#ifndef SIMULATOR
ci->memcpy(iramstart, iramcopy, iramend - iramstart);
#endif
ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*2));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*16));
next_track:
if (codec_init(api))
return CODEC_ERROR;
/* 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;
/* read file's streaminfo data */
mpc_streaminfo info;
mpc_streaminfo_init(&info);
if (mpc_streaminfo_read(&info, &reader) != ERROR_CODE_OK)
return CODEC_ERROR;
frequency = info.sample_freq;
/* instantiate a decoder with our file reader */
mpc_decoder_setup(&decoder, &reader);
if (!mpc_decoder_initialize(&decoder, &info))
return CODEC_ERROR;
/* Initialise the output buffer. */
OutputPtr = OutputBuffer;
OutputBufferEnd = OutputBuffer + OUTPUT_BUFFER_SIZE;
/* This is the decoding loop. */
samplesdone = 0;
while (status != 0) {
if (ci->stop_codec || ci->reload_codec)
break;
status = mpc_decoder_decode(&decoder, sample_buffer, 0, 0);
if (status == (unsigned)(-1)) {
/* decode error */
return CODEC_ERROR;
} else { /* status > 0 */
/* Convert musepack's numbers to an array of 16-bit BE signed integers */
for (i = 0; i < status*info.channels; i += info.channels) {
/* Left channel */
Sample = shift_signed(sample_buffer[i], 16 - MPC_FIXED_POINT_SCALE_SHIFT);
*(OutputPtr++) = Sample >> 8;
*(OutputPtr++) = Sample & 0xff;
/* Right channel. If the decoded stream is monophonic then
* the right output channel is the same as the left one.
*/
if (info.channels == 2) {
Sample = shift_signed(sample_buffer[i + 1], 16 - MPC_FIXED_POINT_SCALE_SHIFT);
}
*(OutputPtr++) = Sample >> 8;
*(OutputPtr++) = Sample & 0xff;
samplesdone++;
/* Flush the buffer if it is full. */
if (OutputPtr == OutputBufferEnd) {
ci->yield();
while (!ci->pcmbuf_insert(OutputBuffer, OUTPUT_BUFFER_SIZE))
ci->yield();
ci->set_elapsed(samplesdone/(frequency/1000));
OutputPtr = OutputBuffer;
}
}
}
}
/* Flush the remaining data in the output buffer */
if (OutputPtr > OutputBuffer) {
ci->yield();
while (!ci->pcmbuf_insert(OutputBuffer, OutputPtr - OutputBuffer))
ci->yield();
}
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
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