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/* aKode: Musepack(MPC) Decoder
Copyright (C) 2004 Allan Sandfeld Jensen <[email protected]>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
//#ifdef AKODE_COMPILE_MPC
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#include "file.h"
#include "audioframe.h"
#include "mpc_dec.h"
#include "mpc_decoder.h"
namespace aKode {
class MPC_reader_impl : public MPC_reader
{
public:
MPC_reader_impl(aKode::File *file, bool p_seekable) : m_file(file), m_seekable(p_seekable)
{
m_file->openRO();
m_file->fadvise();
}
virtual ~MPC_reader_impl() {
m_file->close();
}
size_t read ( void *ptr, size_t size ) {return m_file->read((char*)ptr,size);}
bool seek ( int offset, int origin ) {return m_file->seek(offset,origin);}
long tell () {return m_file->position();}
long get_size () {return m_file->length();}
bool canseek() {return m_file->seekable();}
private:
aKode::File * m_file;
bool m_seekable;
};
bool MPCDecoderPlugin::canDecode(File* src) {
MPC_reader_impl reader(src, true);
StreamInfo si;
int r = si.ReadStreamInfo(&reader);
return r==0;
}
extern "C" { MPCDecoderPlugin mpc_decoder; }
struct MPCDecoder::private_data
{
private_data(File *src) : reader(src,true), decoder(&reader),
initialized(false), buffer(0), position(0),
eof(false), error(false)
{};
MPC_reader_impl reader;
StreamInfo si;
MPC_decoder decoder;
bool initialized;
MPC_SAMPLE_FORMAT *buffer;
long position;
bool eof;
bool error;
AudioConfiguration config;
};
MPCDecoder::MPCDecoder(File *src) {
m_data = new private_data(src);
}
MPCDecoder::~MPCDecoder() {
if (m_data->initialized)
delete[] m_data->buffer;
delete m_data;
}
void MPCDecoder::initialize() {
if (m_data->initialized) return;
m_data->si.ReadStreamInfo(&m_data->reader);
m_data->error = !m_data->decoder.Initialize(&m_data->si);
m_data->buffer = new MPC_SAMPLE_FORMAT[MPC_decoder::DecodeBufferLength];
m_data->initialized = true;
m_data->config.channels = m_data->si.simple.Channels;
m_data->config.sample_rate = m_data->si.simple.SampleFreq;
m_data->config.sample_width = -32;
if (m_data->config.channels <=2)
m_data->config.channel_config = MonoStereo;
else
m_data->config.channel_config = MultiChannel;
}
/*
template<int bits>
static inline int32_t scale(float sample)
{
static const int32_t max = (1<<(bits-1))-1;
// scale
sample *= max;
// round
sample += 0.5;
// clip
if (sample > max)
sample = max;
else
if (sample < -max)
sample = -max;
return (int32_t)sample;
}*/
bool MPCDecoder::readFrame(AudioFrame* frame) {
if (!m_data->initialized) initialize();
int status = m_data->decoder.Decode(m_data->buffer);
if (status == -1) {
m_data->error=true;
return false;
}
if (status == 0) {
m_data->eof=true;
return false;
}
int channels = m_data->config.channels;
long length = status;
frame->reserveSpace(&m_data->config, length);
m_data->position+=length;
// Demux into frame
/*
int16_t** data = (int16_t**)frame->data;
for(int i=0; i<length; i++)
for(int j=0; j<channels; j++) {
data[j][i] = scale<16>(m_data->buffer[i*channels+j]);
}*/
float** data = (float**)frame->data;
for(int i=0; i<length; i++)
for(int j=0; j<channels; j++)
data[j][i] = m_data->buffer[i*channels+j];
frame->pos = position();
return true;
}
long MPCDecoder::length() {
if (!m_data->initialized) return -1;
return (long)(m_data->si.GetLength()*1000.0);
}
long MPCDecoder::position() {
if (!m_data->initialized) return -1;
float mpcpos = ((float)m_data->position)/(float)m_data->si.simple.SampleFreq;
return (long)(mpcpos*1000.0);
}
bool MPCDecoder::eof() {
return m_data->eof;
}
bool MPCDecoder::error() {
return m_data->error;
}
bool MPCDecoder::seekable() {
return m_data->reader.canseek();
}
bool MPCDecoder::seek(long pos) {
if (!m_data->initialized) return false;
long samplepos = (long)((pos*(float)m_data->si.simple.SampleFreq)/1000.0);
if (m_data->decoder.SeekSample(samplepos)) {
m_data->position = samplepos;
return true;
}
else
return false;
}
const AudioConfiguration* MPCDecoder::audioConfiguration() {
return &m_data->config;
}
} // namespace
//#endif
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