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engines/ultima/nuvie/sound/decoder/pc_speaker.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/>.
+ *
+ */
+
+#ifndef NUVIE_SOUND_MIXER_DECODER_PC_SPEAKER_H
+#define NUVIE_SOUND_MIXER_DECODER_PC_SPEAKER_H
+
+#include "ultima/nuvie/files/nuvie_io_file.h"
+
+namespace Ultima {
+namespace Nuvie {
+
+#define SPKR_OUTPUT_RATE 22050 //11025 //FIXME may need to fiddle with this.
+
+class PCSpeaker {
+private:
+	uint32 rate;
+	uint16 frequency;
+	float half_period;
+	float cur_vol;
+	float want_vol;
+	float time_left;
+
+	uint32 osc_length;
+	uint32 osc_samples;
+
+private:
+
+	NuvieIOFileWrite dataFile;
+	uint32 wav_length;
+
+public:
+	PCSpeaker(uint32 mixer_rate);
+	~PCSpeaker() { }
+	void SetOn();
+	void SetOff();
+	void SetFrequency(uint16 freq, float offset = 0.0f);
+
+	void PCSPEAKER_CallBack(sint16 *stream, const uint32 len);
+};
+
+} // End of namespace Nuvie
+} // End of namespace Ultima
+
+#endif