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https://github.com/libretro/scummvm.git
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90 lines
2.5 KiB
C++
90 lines
2.5 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef SCUMM_PLAYERS_PLAYER_V2_H
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#define SCUMM_PLAYERS_PLAYER_V2_H
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#include "scumm/players/player_v2base.h"
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#include "audio/audiostream.h"
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#include "audio/mixer.h"
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namespace Scumm {
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/**
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* Scumm V2 PC-Speaker MIDI driver.
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* This simulates the pc speaker sound, which is driven by the 8253 (square
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* wave generator) and a low-band filter.
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*/
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class Player_V2 : public Audio::AudioStream, public Player_V2Base {
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public:
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Player_V2(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr);
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~Player_V2() override;
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// MusicEngine API
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void setMusicVolume(int vol) override;
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void startSound(int sound) override;
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void stopSound(int sound) override;
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void stopAllSounds() override;
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// virtual int getMusicTimer();
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int getSoundStatus(int sound) const override;
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// AudioStream API
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int readBuffer(int16 *buffer, const int numSamples) override;
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bool isStereo() const override { return true; }
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bool endOfData() const override { return false; }
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int getRate() const override { return _sampleRate; }
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protected:
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enum {
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FIXP_SHIFT = 16
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};
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unsigned int _update_step;
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unsigned int _decay;
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int _level;
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unsigned int _RNG;
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unsigned int _volumetable[16];
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int _timer_count[4];
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int _timer_output;
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Audio::Mixer *_mixer;
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Audio::SoundHandle _soundHandle;
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const uint32 _sampleRate;
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Common::Mutex _mutex;
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uint32 _next_tick;
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uint32 _tick_len;
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protected:
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virtual void generateSpkSamples(int16 *data, uint len);
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virtual void generatePCjrSamples(int16 *data, uint len);
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void lowPassFilter(int16 *data, uint len);
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void squareGenerator(int channel, int freq, int vol,
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int noiseFeedback, int16 *sample, uint len);
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};
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} // End of namespace Scumm
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#endif
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