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128 lines
2.6 KiB
C++
128 lines
2.6 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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* $URL$
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* $Id$
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*
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*/
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#ifndef AGI_SOUND_PCJR_H
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#define AGI_SOUND_PCJR_H
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#include "sound/audiostream.h"
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namespace Agi {
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#define CHAN_MAX 4
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#define SAMPLE_RATE 22050
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enum GenType {
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kGenSilence,
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kGenTone,
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kGenPeriod,
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kGenWhite
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};
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struct SndGenChan {
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const byte *data;
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uint16 duration;
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uint16 avail; // turned on (1) but when the channel's data runs out, it's set to (0)
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uint16 dissolveCount;
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byte attenuation;
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byte attenuationCopy;
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GenType genType;
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// for the sample mixer
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int freqCount;
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};
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struct ToneChan {
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int avail;
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int noteCount; // length of tone.. duration
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int freqCount;
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int freqCountPrev;
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int atten; // volume
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GenType genType;
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int genTypePrev;
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int count;
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int scale;
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int sign;
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unsigned int noiseState; /* noise generator */
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int feedback; /* noise feedback mask */
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};
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struct Tone {
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int freqCount;
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int atten;
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GenType type;
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};
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class SoundGenPCJr : public SoundGen, public Audio::AudioStream {
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public:
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SoundGenPCJr(AgiEngine *vm, Audio::Mixer *pMixer);
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~SoundGenPCJr();
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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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int getNextNote(int ch, Tone *tone);
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int volumeCalc(SndGenChan *chan);
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int chanGen(int chan, int16 *stream, int len);
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int fillNoise(ToneChan *t, int16 *buf, int len);
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int fillSquare(ToneChan *t, int16 *buf, int len);
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private:
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SndGenChan _channel[CHAN_MAX];
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ToneChan _tchannel[CHAN_MAX];
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int16 *_chanData;
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int _chanAllocated;
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int _dissolveMethod;
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};
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} // End of namespace Agi
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#endif /* AGI_SOUND_PCJR_H */
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