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118 lines
2.7 KiB
C++
118 lines
2.7 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef AGI_SOUND_SARIEN_H
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#define AGI_SOUND_SARIEN_H
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#include "audio/audiostream.h"
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namespace Agi {
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#define BUFFER_SIZE 410
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#define WAVEFORM_SIZE 64
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#define ENV_ATTACK 10000 /**< envelope attack rate */
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#define ENV_DECAY 1000 /**< envelope decay rate */
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#define ENV_SUSTAIN 100 /**< envelope sustain level */
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#define ENV_RELEASE 7500 /**< envelope release rate */
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#define NUM_CHANNELS 7 /**< number of sound channels */
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enum AgiSoundFlags {
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AGI_SOUND_LOOP = 0x0001,
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AGI_SOUND_ENVELOPE = 0x0002
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};
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enum AgiSoundEnv {
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AGI_SOUND_ENV_ATTACK = 3,
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AGI_SOUND_ENV_DECAY = 2,
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AGI_SOUND_ENV_SUSTAIN = 1,
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AGI_SOUND_ENV_RELEASE = 0
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};
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/**
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* AGI engine sound channel structure.
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*/
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struct ChannelInfo {
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AgiSoundEmuType type;
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const uint8 *ptr; // Pointer to the AgiNote data
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const int16 *ins;
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int32 size;
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uint32 phase;
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uint32 flags; // ORs values from AgiSoundFlags
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AgiSoundEnv adsr;
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int32 timer;
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uint32 end;
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uint32 freq;
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uint32 vol;
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uint32 env;
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};
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class SoundGenSarien : public SoundGen, public Audio::AudioStream {
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public:
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SoundGenSarien(AgiBase *vm, Audio::Mixer *pMixer);
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~SoundGenSarien();
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void play(int resnum);
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void stop(void);
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// AudioStream API
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int readBuffer(int16 *buffer, const int numSamples);
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bool isStereo() const {
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return false;
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}
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bool endOfData() const {
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return false;
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}
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int getRate() const {
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// FIXME: Ideally, we should use _sampleRate.
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return 22050;
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}
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private:
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ChannelInfo _chn[NUM_CHANNELS];
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uint8 _env;
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int16 *_sndBuffer;
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const int16 *_waveform;
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bool _useChorus;
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bool _playing;
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int _playingSound;
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private:
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void playSound();
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uint32 mixSound();
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void fillAudio(int16 *stream, uint len);
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void stopNote(int i);
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void playNote(int i, int freq, int vol);
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};
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} // End of namespace Agi
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#endif /* AGI_SOUND_SARIEN_H */
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