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author | Neeraj Kumar | 2010-08-06 20:13:41 +0000 |
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committer | Neeraj Kumar | 2010-08-06 20:13:41 +0000 |
commit | 7e126ed299cb789340cb2f8d409338dbdd6c8235 (patch) | |
tree | 91f6e4be633fd579922ddf270443011582b8f9ec /engines/agi/sound_pcjr.h | |
parent | 6c0855f3d3efc52478ba9ce019fbd4c9287f4691 (diff) | |
parent | 4ae7427eed781613e2cda096d0f61c77883bca05 (diff) | |
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TESTBED: Merged changes from trunk to my branch
svn-id: r51798
Diffstat (limited to 'engines/agi/sound_pcjr.h')
-rw-r--r-- | engines/agi/sound_pcjr.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/engines/agi/sound_pcjr.h b/engines/agi/sound_pcjr.h new file mode 100644 index 0000000000..fe0e762f4e --- /dev/null +++ b/engines/agi/sound_pcjr.h @@ -0,0 +1,127 @@ +/* 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. + * + * $URL$ + * $Id$ + * + */ + +#ifndef AGI_SOUND_PCJR_H +#define AGI_SOUND_PCJR_H + +#include "sound/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 */ +}; + +struct Tone { + int freqCount; + int atten; + GenType type; +}; + +class SoundGenPCJr : public SoundGen, public Audio::AudioStream { +public: + SoundGenPCJr(AgiEngine *vm, Audio::Mixer *pMixer); + ~SoundGenPCJr(); + + 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: + int getNextNote(int ch, Tone *tone); + int volumeCalc(SndGenChan *chan); + + 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: + SndGenChan _channel[CHAN_MAX]; + ToneChan _tchannel[CHAN_MAX]; + int16 *_chanData; + int _chanAllocated; + + int _dissolveMethod; +}; + +} // End of namespace Agi + +#endif /* AGI_SOUND_PCJR_H */ |