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engines/gob/sound/soundmixer.h

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+/* 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/>.
+ *
+ *
+ * This file is dual-licensed.
+ * In addition to the GPLv3 license mentioned above, this code is also
+ * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
+ * full text of the license.
+ *
+ */
+
+#ifndef GOB_SOUND_SOUNDMIXER_H
+#define GOB_SOUND_SOUNDMIXER_H
+
+#include "common/mutex.h"
+#include "common/frac.h"
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+
+namespace Gob {
+
+class SoundDesc;
+
+class SoundMixer : public Audio::AudioStream {
+public:
+	SoundMixer(Audio::Mixer &mixer, Audio::Mixer::SoundType type);
+	~SoundMixer() override;
+
+	virtual void play(SoundDesc &sndDesc, int16 repCount,
+			int16 frequency, int16 fadeLength = 0);
+	virtual void stop(int16 fadeLength);
+
+	bool isPlaying() const;
+	char getPlayingSound() const;
+
+	void setRepeating(int32 repCount);
+
+	int readBuffer(int16 *buffer, const int numSamples) override;
+	bool isStereo() const override { return false; }
+	bool endOfData() const override { return _end; }
+	bool endOfStream() const override { return false; }
+	int getRate() const override { return _rate; }
+
+protected:
+	Audio::Mixer *_mixer;
+
+	Audio::SoundHandle _handle;
+	Common::Mutex _mutex;
+
+	bool _16bit;
+
+	bool _end;
+	byte *_data;
+	uint32 _length;
+	uint32 _rate;
+	int32 _freq;
+	int32 _repCount;
+
+	uint32 _offset;
+	frac_t _offsetFrac;
+	frac_t _offsetInc;
+
+	int16 _cur;
+	int16 _last;
+
+	bool _fade;
+	int32 _fadeVol;
+	int32 _fadeVolStep;
+	uint8 _fadeLength;
+	uint32 _fadeSamples;
+	uint32 _curFadeSamples;
+
+	char _playingSound;
+
+	virtual void setSample(SoundDesc &sndDesc, int16 repCount,
+			int16 frequency, int16 fadeLength);
+	virtual void checkEndSample();
+	virtual void endFade();
+
+private:
+	inline int16 getData(int offset);
+};
+
+} // End of namespace Gob
+
+#endif // GOB_SOUND_SOUNDMIXER_H