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/* ScummVM - Scumm Interpreter
* Copyright (C) 2005-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#ifndef SOUND_ADPCM_H
#define SOUND_ADPCM_H
#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/stream.h"
#include "sound/audiostream.h"
class AudioStream;
enum typesADPCM {
kADPCMOki,
kADPCMIma
};
// TODO: Switch from a SeekableReadStream to a plain ReadStream. This requires
// some internal refactoring but is definitely possible and will increase the
// flexibility of this code.
class ADPCMInputStream : public AudioStream {
private:
Common::SeekableReadStream *_stream;
uint32 _endpos;
int _channels;
typesADPCM _type;
uint32 _blockAlign;
struct adpcmStatus {
int32 last;
int32 stepIndex;
} _status;
int16 stepAdjust(byte);
int16 decodeOKI(byte);
int16 decodeMSIMA(byte);
public:
ADPCMInputStream(Common::SeekableReadStream *stream, uint32 size, typesADPCM type, int channels = 2, uint32 blockAlign = 0);
~ADPCMInputStream() {};
int readBuffer(int16 *buffer, const int numSamples);
int readBufferOKI(int16 *buffer, const int numSamples);
int readBufferMSIMA1(int16 *buffer, const int numSamples);
int readBufferMSIMA2(int16 *buffer, const int numSamples);
bool endOfData() const { return (_stream->eos() || _stream->pos() >= _endpos); }
bool isStereo() const { return false; }
int getRate() const { return 22050; }
};
#endif
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