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https://github.com/scummvm/scummvm.git
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95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef PCM_COMMON_H
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#define PCM_COMMON_H
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#include "common/scummsys.h"
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// The SegaCD and the FM-Towns have (almost) the same PCM sound chip. And while each platform has low-level driver
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// stuff going on top of that it still makes sense to identify and abstract some commmon code.
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class PCMChannel_Base {
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public:
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PCMChannel_Base();
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virtual ~PCMChannel_Base();
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virtual void clear();
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void updateOutput();
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int32 currentSampleLeft();
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int32 currentSampleRight();
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virtual bool isPlaying() const = 0;
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bool isActive() const;
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void activate();
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void deactivate();
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protected:
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void setData(const int8 *data, uint32 dataEnd, uint32 dataStart = 0);
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void setVolume(uint8 vol);
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void setPanPos(uint8 setPanPos);
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void setupLoop(uint32 loopStart, uint32 loopLen);
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void setRate(uint16 rate);
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private:
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virtual void stopInternal() = 0;
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uint8 _panLeft;
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uint8 _panRight;
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uint8 _vol;
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bool _activeOutput;
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uint32 _loopStart;
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uint32 _loopLen;
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uint32 _dataEnd;
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uint32 _pos;
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uint16 _step;
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const int8 *_data;
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};
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class PCMDevice_Base {
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public:
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PCMDevice_Base(int samplingRate, int deviceVolume, int numChannels);
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~PCMDevice_Base();
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void assignChannel(uint8 id, PCMChannel_Base *const chan);
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void setMusicVolume(uint16 vol);
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void setSfxVolume(uint16 vol);
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void setSfxChanMask(int mask);
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void readBuffer(int32 *buffer, uint32 bufferSize);
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private:
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const uint32 _intRate;
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const uint32 _extRate;
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const int _deviceVolume;
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uint32 _timer;
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uint16 _musicVolume;
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uint16 _sfxVolume;
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int _pcmSfxChanMask;
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PCMChannel_Base **_channels;
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const int _numChannels;
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};
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#endif
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