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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 AGI_SOUND_PCJR_H
#define AGI_SOUND_PCJR_H
#include "audio/audiostream.h"
namespace Agi {
#define CHAN_MAX 4
#define SAMPLE_RATE 22050
enum GenType {
kGenSilence,
kGenTone,
kGenPeriod,
kGenWhite
};
struct SndGenChan {
const byte *data;
uint16 duration;
uint16 avail; // turned on (1) but when the channel's data runs out, it's set to (0)
uint16 dissolveCount;
byte attenuation;
byte attenuationCopy;
GenType genType;
// for the sample mixer
int freqCount;
};
struct ToneChan {
int avail;
int noteCount; // length of tone.. duration
int freqCount;
int freqCountPrev;
int atten; // volume
GenType genType;
int genTypePrev;
int count;
int scale;
int sign;
unsigned int noiseState; /* noise generator */
int feedback; /* noise feedback mask */
};
class SoundGenPCJr : public SoundGen, public Audio::AudioStream {
public:
SoundGenPCJr(AgiBase *vm, Audio::Mixer *pMixer);
~SoundGenPCJr() override;
void play(int resnum) override;
void stop() override;
// AudioStream API
int readBuffer(int16 *buffer, const int numSamples) override;
bool isStereo() const override {
return false;
}
bool endOfData() const override {
return false;
}
int getRate() const override {
// FIXME: Ideally, we should use _sampleRate.
return 22050;
}
private:
int getNextNote(int ch);
int getNextNote_v2(int ch);
int getNextNote_v1(int ch);
int volumeCalc(SndGenChan *chan);
void writeData(uint8 val);
int chanGen(int chan, int16 *stream, int len);
int fillNoise(ToneChan *t, int16 *buf, int len);
int fillSquare(ToneChan *t, int16 *buf, int len);
private:
Common::Mutex _mutex;
SndGenChan _channel[CHAN_MAX];
ToneChan _tchannel[CHAN_MAX];
int16 *_chanData;
int _chanAllocated;
int _dissolveMethod;
uint8 *_v1data;
uint32 _v1size;
int _v1duration;
int _reg;
};
} // End of namespace Agi
#endif /* AGI_SOUND_PCJR_H */
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