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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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef PCM_COMMON_H
#define PCM_COMMON_H
#include "common/scummsys.h"
// The SegaCD and the FM-Towns have (almost) the same PCM sound chip. And while each platform has low-level driver
// stuff going on top of that it still makes sense to identify and abstract some commmon code.
class PCMChannel_Base {
public:
PCMChannel_Base();
virtual ~PCMChannel_Base();
virtual void clear();
void updateOutput();
int32 currentSampleLeft();
int32 currentSampleRight();
virtual bool isPlaying() const = 0;
bool isActive() const;
void activate();
void deactivate();
protected:
void setData(const int8 *data, uint32 dataEnd, uint32 dataStart = 0);
void setVolume(uint8 vol);
void setPanPos(uint8 setPanPos);
void setupLoop(uint32 loopStart, uint32 loopLen);
void setRate(uint16 rate);
private:
virtual void stopInternal() = 0;
uint8 _panLeft;
uint8 _panRight;
uint8 _vol;
bool _activeOutput;
uint32 _loopStart;
uint32 _loopLen;
uint32 _dataEnd;
uint32 _pos;
uint16 _step;
const int8 *_data;
};
class PCMDevice_Base {
public:
PCMDevice_Base(int samplingRate, int deviceVolume, int numChannels);
~PCMDevice_Base();
void assignChannel(uint8 id, PCMChannel_Base *const chan);
void setMusicVolume(uint16 vol);
void setSfxVolume(uint16 vol);
void setSfxChanMask(int mask);
void readBuffer(int32 *buffer, uint32 bufferSize);
private:
const uint32 _intRate;
const uint32 _extRate;
const int _deviceVolume;
uint32 _timer;
uint16 _musicVolume;
uint16 _sfxVolume;
int _pcmSfxChanMask;
PCMChannel_Base **_channels;
const int _numChannels;
};
#endif
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