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engines/titanic/sound/audio_buffer.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 TITANIC_AUDIO_BUFFER_H
+#define TITANIC_AUDIO_BUFFER_H
+
+#include "titanic/support/fixed_queue.h"
+#include "common/mutex.h"
+
+namespace Titanic {
+
+#define AUDIO_SAMPLING_RATE 22050
+
+class CAudioBuffer {
+private:
+	Common::Mutex _mutex;
+	FixedQueue<int16, AUDIO_SAMPLING_RATE * 4> _data;
+private:
+	/**
+	 * Enters a critical section
+	 */
+	void enterCriticalSection();
+
+	/**
+	 * Leave a critical section
+	 */
+	void leaveCriticalSection();
+private:
+	bool _finished;
+public:
+	CAudioBuffer(int maxSize);
+
+	/**
+	 * Resets the audio buffer
+	 */
+	void reset();
+
+	/**
+	 * Returns true if the buffer is empty
+	 */
+	bool empty() const { return _data.empty(); }
+
+	/**
+	 * Returns the number of 16-bit entries in the buffer
+	 */
+	int size() const { return _data.size(); }
+
+	/**
+	 * Returns the number of entries free in the buffer
+	 */
+	int freeSize() const { return _data.freeSize(); }
+
+	/**
+	 * Returns true if the buffer is full
+	 */
+	bool full() const { return _data.full(); }
+
+	/**
+	 * Returns true if the audio buffering is finished
+	 */
+	bool isFinished() const { return _finished && empty(); }
+
+	/**
+	 * Adds a value to the buffer
+	 */
+	void push(int16 value);
+
+	/**
+	 * Adds a value to the buffer
+	 */
+	void push(const int16 *values, int count);
+
+	/**
+	 * Removes a value from the buffer
+	 */
+	int16 pop();
+
+	/**
+	 * Reads out a specified number of samples
+	 */
+	int read(int16 *values, int count);
+
+	/**
+	 * Marks the buffer as finishing, and that no more new data will arrive
+	 */
+	void finalize() { _finished = true; }
+};
+
+} // End of namespace Titanic
+
+#endif /* TITANIC_AUDIO_BUFFER_H */