/*
 * Copyright 2011-2020 Arx Libertatis Team (see the AUTHORS file)
 *
 * This file is part of Arx Libertatis.
 *
 * Arx Libertatis 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 3 of the License, or
 * (at your option) any later version.
 *
 * Arx Libertatis 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 Arx Libertatis.  If not, see <http://www.gnu.org/licenses/>.
 */
/* Based on:
===========================================================================
ARX FATALIS GPL Source Code
Copyright (C) 1999-2010 Arkane Studios SA, a ZeniMax Media company.

This file is part of the Arx Fatalis GPL Source Code ('Arx Fatalis Source Code'). 

Arx Fatalis Source Code 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 3 of the License, or (at your option) any later version.

Arx Fatalis Source Code 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 Arx Fatalis Source Code.  If not, see 
<http://www.gnu.org/licenses/>.

In addition, the Arx Fatalis Source Code is also subject to certain additional terms. You should have received a copy of these 
additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Arx 
Fatalis Source Code. If not, please request a copy in writing from Arkane Studios at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing Arkane Studios, c/o 
ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
===========================================================================
*/

#ifndef ARX_AUDIO_CODEC_ADPCM_H
#define ARX_AUDIO_CODEC_ADPCM_H

#include <stddef.h>

#include <vector>

#include "audio/AudioTypes.h"
#include "audio/codec/Codec.h"
#include "platform/Platform.h"

class PakFileHandle;
struct ADPCMHeader;

namespace audio {

class CodecADPCM : public Codec {
	
public:
	
	CodecADPCM();
	
	aalError setHeader(void * header);
	void setStream(PakFileHandle * stream);
	aalError setPosition(size_t position);
	
	aalError read(void * buffer, size_t to_read, size_t & read);
	
private:
	
	enum { MaxChannels = 2 };
	
	void getSample(size_t channel, s8 adpcmSample);
	aalError getNextBlock();
	
	PakFileHandle * m_stream;
	ADPCMHeader * m_header;
	u32 padding;
	u32 shift;
	u32 sample_i;
	u8 predictor[MaxChannels];
	s16 delta[MaxChannels];
	s16 samp1[MaxChannels];
	s16 samp2[MaxChannels];
	s16 coef1[MaxChannels];
	s16 coef2[MaxChannels];
	std::vector<s8> nybble_l;
	u32 nybble_i;
	s8 nybble;
	bool odd;
	u8 cache_c, cache_i;
	s16 cache_l[MaxChannels];
	
};

} // namespace audio

#endif // ARX_AUDIO_CODEC_ADPCM_H
