Initial commit

engines/scumm/players/player_v2.h

@@ -0,0 +1,89 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef SCUMM_PLAYERS_PLAYER_V2_H
+#define SCUMM_PLAYERS_PLAYER_V2_H
+
+#include "scumm/players/player_v2base.h"
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+
+namespace Scumm {
+
+/**
+ * Scumm V2 PC-Speaker MIDI driver.
+ * This simulates the pc speaker sound, which is driven  by the 8253 (square
+ * wave generator) and a low-band filter.
+ */
+class Player_V2 : public Audio::AudioStream, public Player_V2Base {
+public:
+	Player_V2(ScummEngine *scumm, Audio::Mixer *mixer, bool pcjr);
+	~Player_V2() override;
+
+	// MusicEngine API
+	void setMusicVolume(int vol) override;
+	void startSound(int sound) override;
+	void stopSound(int sound) override;
+	void stopAllSounds() override;
+//	virtual int  getMusicTimer();
+	int  getSoundStatus(int sound) const override;
+
+	// AudioStream API
+	int readBuffer(int16 *buffer, const int numSamples) override;
+	bool isStereo() const override { return true; }
+	bool endOfData() const override { return false; }
+	int getRate() const override { return _sampleRate; }
+
+protected:
+	enum {
+		FIXP_SHIFT = 16
+	};
+
+	unsigned int _update_step;
+	unsigned int _decay;
+	int _level;
+	unsigned int _RNG;
+	unsigned int _volumetable[16];
+
+	int _timer_count[4];
+	int _timer_output;
+
+	Audio::Mixer *_mixer;
+	Audio::SoundHandle _soundHandle;
+	const uint32 _sampleRate;
+
+	Common::Mutex _mutex;
+
+	uint32 _next_tick;
+	uint32 _tick_len;
+
+protected:
+	virtual void generateSpkSamples(int16 *data, uint len);
+	virtual void generatePCjrSamples(int16 *data, uint len);
+
+	void lowPassFilter(int16 *data, uint len);
+	void squareGenerator(int channel, int freq, int vol,
+						int noiseFeedback, int16 *sample, uint len);
+};
+
+} // End of namespace Scumm
+
+#endif