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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/**
* Internal interfaces to the ADPCM decoders.
*
* These can be used to make custom ADPCM decoder subclasses,
* or to at least share some common data tables between various
* ADPCM decoder implementations.
*/
#ifndef AUDIO_ADPCM_INTERN_H
#define AUDIO_ADPCM_INTERN_H
#include "audio/audiostream.h"
#include "common/endian.h"
#include "common/ptr.h"
#include "common/stream.h"
#include "common/textconsole.h"
namespace Audio {
class ADPCMStream : public SeekableAudioStream {
protected:
Common::DisposablePtr<Common::SeekableReadStream> _stream;
int32 _startpos;
const int32 _endpos;
const int _channels;
const uint32 _blockAlign;
uint32 _blockPos[2];
const int _rate;
struct ADPCMStatus {
// OKI/IMA
struct {
int32 last;
int32 stepIndex;
} ima_ch[2];
} _status;
virtual void reset();
public:
ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign);
virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos); }
virtual bool isStereo() const { return _channels == 2; }
virtual int getRate() const { return _rate; }
virtual bool rewind();
virtual bool seek(const Timestamp &where) { return false; }
virtual Timestamp getLength() const { return Timestamp(); }
/**
* This table is used by some ADPCM variants (IMA and OKI) to adjust the
* step for use on the next sample.
* The first 8 entries are identical to the second 8 entries. Hence, we
* could half the table in size. But since the lookup index is always a
* 4-bit nibble, it is more efficient to just keep it as it is.
*/
static const int16 _stepAdjustTable[16];
};
class Oki_ADPCMStream : public ADPCMStream {
public:
Oki_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) { _decodedSampleCount = 0; }
virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos) && (_decodedSampleCount == 0); }
virtual int readBuffer(int16 *buffer, const int numSamples);
protected:
int16 decodeOKI(byte);
private:
uint8 _decodedSampleCount;
int16 _decodedSamples[2];
};
class Ima_ADPCMStream : public ADPCMStream {
protected:
int16 decodeIMA(byte code, int channel = 0); // Default to using the left channel/using one channel
public:
Ima_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}
/**
* This table is used by decodeIMA.
*/
static const int16 _imaTable[89];
};
class DVI_ADPCMStream : public Ima_ADPCMStream {
public:
DVI_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: Ima_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) { _decodedSampleCount = 0; }
virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos) && (_decodedSampleCount == 0); }
virtual int readBuffer(int16 *buffer, const int numSamples);
private:
uint8 _decodedSampleCount;
int16 _decodedSamples[2];
};
class Apple_ADPCMStream : public Ima_ADPCMStream {
protected:
// Apple QuickTime IMA ADPCM
int32 _streamPos[2];
int16 _buffer[2][2];
uint8 _chunkPos[2];
void reset() {
Ima_ADPCMStream::reset();
_chunkPos[0] = 0;
_chunkPos[1] = 0;
_streamPos[0] = 0;
_streamPos[1] = _blockAlign;
}
public:
Apple_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: Ima_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
_chunkPos[0] = 0;
_chunkPos[1] = 0;
_streamPos[0] = 0;
_streamPos[1] = _blockAlign;
}
virtual int readBuffer(int16 *buffer, const int numSamples);
};
class MSIma_ADPCMStream : public Ima_ADPCMStream {
public:
MSIma_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: Ima_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
if (blockAlign == 0)
error("MSIma_ADPCMStream(): blockAlign isn't specified");
if (blockAlign % (_channels * 4))
error("MSIma_ADPCMStream(): invalid blockAlign");
_samplesLeft[0] = 0;
_samplesLeft[1] = 0;
}
virtual int readBuffer(int16 *buffer, const int numSamples);
void reset() {
Ima_ADPCMStream::reset();
_samplesLeft[0] = 0;
_samplesLeft[1] = 0;
}
private:
int16 _buffer[2][8];
int _samplesLeft[2];
};
class MS_ADPCMStream : public ADPCMStream {
protected:
struct ADPCMChannelStatus {
byte predictor;
int16 delta;
int16 coeff1;
int16 coeff2;
int16 sample1;
int16 sample2;
};
struct {
// MS ADPCM
ADPCMChannelStatus ch[2];
} _status;
void reset() {
ADPCMStream::reset();
memset(&_status, 0, sizeof(_status));
}
public:
MS_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
if (blockAlign == 0)
error("MS_ADPCMStream(): blockAlign isn't specified for MS ADPCM");
memset(&_status, 0, sizeof(_status));
_decodedSampleCount = 0;
_decodedSampleIndex = 0;
}
virtual bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos) && (_decodedSampleCount == 0); }
virtual int readBuffer(int16 *buffer, const int numSamples);
protected:
int16 decodeMS(ADPCMChannelStatus *c, byte);
private:
uint8 _decodedSampleCount;
uint8 _decodedSampleIndex;
int16 _decodedSamples[4];
};
// Duck DK3 IMA ADPCM Decoder
// Based on FFmpeg's decoder and http://wiki.multimedia.cx/index.php?title=Duck_DK3_IMA_ADPCM
class DK3_ADPCMStream : public Ima_ADPCMStream {
public:
DK3_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
: Ima_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
// DK3 only works as a stereo stream
assert(channels == 2);
}
virtual int readBuffer(int16 *buffer, const int numSamples);
private:
byte _nibble, _lastByte;
bool _topNibble;
};
} // End of namespace Audio
#endif
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