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https://github.com/libretro/scummvm.git
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73 lines
2.1 KiB
C++
73 lines
2.1 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 SCUMM_PLAYER_V2_H
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#define SCUMM_PLAYER_V2_H
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#include "scumm/player_v2base.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 Player_V2Base {
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public:
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Player_V2(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr);
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virtual ~Player_V2();
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// MusicEngine API
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virtual void setMusicVolume(int vol);
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virtual void startSound(int sound);
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virtual void stopSound(int sound);
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virtual void stopAllSounds();
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// virtual int getMusicTimer();
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virtual int getSoundStatus(int sound) const;
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// AudioStream API
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virtual int readBuffer(int16 *buffer, const int numSamples);
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protected:
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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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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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