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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 "plugin.h"
#include "playback.h"
#include "lib/codeclib.h"
#include <codecs/libmusepack/musepack.h>
static struct plugin_api* rb;
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;
/* We don't support seeking yet. */
(void)ci;
(void)offset;
return 0;
}
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;
return false;
}
static 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];
MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH];
unsigned char *OutputPtr=OutputBuffer;
const unsigned char *OutputBufferEnd=OutputBuffer+OUTPUT_BUFFER_SIZE;
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
/* this is the plugin entry point */
enum plugin_status plugin_start(struct plugin_api* api, void* parm)
{
struct codec_api* ci = (struct codec_api*)parm;
unsigned short Sample;
unsigned long samplesdone;
unsigned long frequency;
unsigned status = 1;
unsigned int i;
mpc_reader reader;
/* Generic plugin inititialisation */
TEST_PLUGIN_API(api);
rb = api;
#ifndef SIMULATOR
rb->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, ci)) {
return PLUGIN_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 PLUGIN_ERROR;
}
frequency=info.sample_freq;
/* instantiate a decoder with our file reader */
mpc_decoder_setup(&decoder, &reader);
if (!mpc_decoder_initialize(&decoder, &info)) {
return PLUGIN_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 PLUGIN_ERROR;
}
else //status>0
{
// file_info.current_sample += status;
// file_info.frames_decoded++;
/* 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)
{
rb->yield();
while (!ci->audiobuffer_insert(OutputBuffer, OUTPUT_BUFFER_SIZE)) {
rb->yield();
}
ci->set_elapsed(samplesdone/(frequency/1000));
OutputPtr=OutputBuffer;
}
}
}
}
/* Flush the remaining data in the output buffer */
if (OutputPtr > OutputBuffer) {
rb->yield();
while (!ci->audiobuffer_insert(OutputBuffer, OutputPtr-OutputBuffer)) {
rb->yield();
}
}
if (ci->request_next_track())
goto next_track;
return PLUGIN_OK;
}
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