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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 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.
*
*/
#ifndef AGI_SOUND_SARIEN_H
#define AGI_SOUND_SARIEN_H
#include "audio/audiostream.h"
namespace Agi {
#define BUFFER_SIZE 410
#define WAVEFORM_SIZE 64
#define ENV_ATTACK 10000 /**< envelope attack rate */
#define ENV_DECAY 1000 /**< envelope decay rate */
#define ENV_SUSTAIN 100 /**< envelope sustain level */
#define ENV_RELEASE 7500 /**< envelope release rate */
#define NUM_CHANNELS 7 /**< number of sound channels */
enum AgiSoundFlags {
AGI_SOUND_LOOP = 0x0001,
AGI_SOUND_ENVELOPE = 0x0002
};
enum AgiSoundEnv {
AGI_SOUND_ENV_ATTACK = 3,
AGI_SOUND_ENV_DECAY = 2,
AGI_SOUND_ENV_SUSTAIN = 1,
AGI_SOUND_ENV_RELEASE = 0
};
/**
* AGI engine sound channel structure.
*/
struct ChannelInfo {
AgiSoundEmuType type;
const uint8 *ptr; // Pointer to the AgiNote data
const int16 *ins;
int32 size;
uint32 phase;
uint32 flags; // ORs values from AgiSoundFlags
AgiSoundEnv adsr;
int32 timer;
uint32 end;
uint32 freq;
uint32 vol;
uint32 env;
};
class SoundGenSarien : public SoundGen, public Audio::AudioStream {
public:
SoundGenSarien(AgiBase *vm, Audio::Mixer *pMixer);
~SoundGenSarien();
void play(int resnum);
void stop(void);
// AudioStream API
int readBuffer(int16 *buffer, const int numSamples);
bool isStereo() const {
return false;
}
bool endOfData() const {
return false;
}
int getRate() const {
// FIXME: Ideally, we should use _sampleRate.
return 22050;
}
private:
ChannelInfo _chn[NUM_CHANNELS];
uint8 _env;
int16 *_sndBuffer;
const int16 *_waveform;
bool _useChorus;
bool _playing;
int _playingSound;
private:
void playSound();
uint32 mixSound();
void fillAudio(int16 *stream, uint len);
void stopNote(int i);
void playNote(int i, int freq, int vol);
};
} // End of namespace Agi
#endif /* AGI_SOUND_SARIEN_H */
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