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/*
*
* $Id: k3bmpcwrapper.cpp 425047 2005-06-13 18:06:10Z trueg $
* Copyright (C) 2005 Sebastian Trueg <trueg@k3b.org>
*
* This file is part of the K3b project.
* Copyright (C) 1998-2005 Sebastian Trueg <trueg@k3b.org>
*
* 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.
* See the file "COPYING" for the exact licensing terms.
*/
#include "k3bmpcwrapper.h"
#include <kdebug.h>
#include <qfile.h>
mpc_int32_t read_impl( void* data, void* ptr, mpc_int32_t size )
{
QFile* input = static_cast<QFile*>( data );
return input->readBlock( (char*)ptr, size );
}
mpc_bool_t seek_impl( void* data, mpc_int32_t offset )
{
QFile* input = static_cast<QFile*>( data );
return input->at( offset );
}
mpc_int32_t tell_impl( void* data )
{
QFile* input = static_cast<QFile*>( data );
return input->at();
}
mpc_int32_t get_size_impl( void* data )
{
QFile* input = static_cast<QFile*>( data );
return input->size();
}
mpc_bool_t canseek_impl( void* )
{
return true;
}
#ifdef MPC_FIXED_POINT
static int shift_signed( MPC_SAMPLE_FORMAT val, int shift )
{
if(shift > 0)
val <<= shift;
else if(shift < 0)
val >>= -shift;
return (int) val;
}
#endif
K3bMpcWrapper::K3bMpcWrapper()
{
m_input = new QFile();
m_reader = new mpc_reader;
m_reader->read = read_impl;
m_reader->seek = seek_impl;
m_reader->tell = tell_impl;
m_reader->get_size = get_size_impl;
m_reader->canseek = canseek_impl;
m_reader->data = m_input;
m_decoder = new mpc_decoder;
m_info = new mpc_streaminfo;
}
K3bMpcWrapper::~K3bMpcWrapper()
{
close();
delete m_reader;
delete m_decoder;
delete m_info;
delete m_input;
}
bool K3bMpcWrapper::open( const QString& filename )
{
close();
m_input->setName( filename );
if( m_input->open( IO_ReadOnly ) ) {
mpc_streaminfo_init( m_info );
if( mpc_streaminfo_read( m_info, m_reader ) != ERROR_CODE_OK ) {
kdDebug() << "(K3bMpcWrapper) Not a valid musepack file: \"" << filename << "\"" << endl;
return false;
}
else {
mpc_decoder_setup( m_decoder, m_reader );
if( !mpc_decoder_initialize( m_decoder, m_info ) ) {
kdDebug() << "(K3bMpcWrapper) failed to initialize the Musepack decoder." << endl;
close();
return false;
}
else {
kdDebug() << "(K3bMpcWrapper) valid musepack file. "
<< channels() << " Channels and Samplerate: " << samplerate() << endl;
return true;
}
}
}
else
return false;
}
void K3bMpcWrapper::close()
{
m_input->close();
}
int K3bMpcWrapper::decode( char* data, int max )
{
// FIXME: make this a member variable
MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH];
unsigned int samples = mpc_decoder_decode( m_decoder, sample_buffer, 0, 0 );
if( samples*channels()*2 > (unsigned int)max ) {
kdDebug() << "(K3bMpcWrapper) buffer not big enough." << endl;
return -1;
}
static const unsigned int bps = 16;
static const int clip_min = -1 << (bps - 1);
static const int clip_max = (1 << (bps - 1)) - 1;
static const int float_scale = 1 << (bps - 1);
for( unsigned int n = 0; n < samples*channels(); ++n ) {
int val = 0;
#ifdef MPC_FIXED_POINT
val = shift_signed( sample_buffer[n],
bps - MPC_FIXED_POINT_SCALE_SHIFT);
#else
val = (int)(sample_buffer[n] * float_scale);
#endif
if( val < clip_min )
val = clip_min;
else if( val > clip_max )
val = clip_max;
data[2*n] = (val>>8) & 0xff;
data[2*n+1] = val & 0xff;
}
return samples*channels()*2;
}
bool K3bMpcWrapper::seek( const K3b::Msf& msf )
{
return mpc_decoder_seek_seconds( m_decoder, (double)msf.totalFrames()/75.0 );
}
K3b::Msf K3bMpcWrapper::length() const
{
return K3b::Msf::fromSeconds( mpc_streaminfo_get_length( m_info ) );
}
int K3bMpcWrapper::samplerate() const
{
return m_info->sample_freq;
}
unsigned int K3bMpcWrapper::channels() const
{
return m_info->channels;
}
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