PSP: switched from SDL's audio to my own thread. Removed needless blocking while playing and made it generally more efficient. To deactivate, simply comment out USE_PSP_AUDIO

svn-id: r49149

1 files changed, 71 insertions, 0 deletions

diff --git a/backends/platform/psp/audio.h b/backends/platform/psp/audio.h
new file mode 100644
index 0000000000..97e2391319
--- /dev/null
+++ b/backends/platform/psp/audio.h
@@ -0,0 +1,71 @@
+/* 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/backends/platform/psp/osys_psp.cpp $
+ * $Id: osys_psp.cpp 46126 2009-11-24 14:18:46Z fingolfin $
+ *
+ */
+
+#ifndef PSP_AUDIO_H
+#define PSP_AUDIO_H
+
+class PspAudio {
+public:
+	enum {
+		NUM_BUFFERS = 2,
+		FREQUENCY = 44100	/* only frequency we allow */
+	};
+	typedef void (* callbackFunc)(void *userData, byte *samples, int len);
+	PspAudio() : _pspChannel(0), 
+			_numOfChannels(0), _numOfSamples(0), _callback(0), 
+			_bufferToPlay(0), _bufferToFill(0), _emptyBuffers(NUM_BUFFERS), 
+			_init(false), _paused(true), _stoppedPlayingOnceFlag(true) {
+		for (int i=0; i<NUM_BUFFERS; i++)
+			_buffers[i] = 0;
+	}
+	~PspAudio() { close(); }
+	bool playBuffer();
+	void nextBuffer(int &bufferIdx);
+	static int thread(SceSize, void *);
+	void audioThread();
+	bool open(uint32 freq, uint32 numOfChannels, uint32 numOfSamples, callbackFunc callback, void *userData);
+	bool createThread();
+	void close();
+	uint32 getFrequency() { return FREQUENCY; }
+	void pause() { _paused = true; }
+	void unpause() { _paused = false; }
+	
+private:
+	int _pspChannel;				// chosen hardware output channel
+	uint32 _numOfChannels;			// 1 for mono; 2 for stereo
+	uint32 _numOfSamples;
+	callbackFunc _callback;			// the callback to call between outputting audio
+	void *_userData;				// userData to send with callback
+	byte *_buffers[NUM_BUFFERS];
+	int _bufferToPlay;				// the next buffer to output
+	int _bufferToFill;
+	int _bufferSize;
+	int _emptyBuffers;
+	bool _init;						// flag for initialization
+	bool _paused;
+	bool _stoppedPlayingOnceFlag;		// used to make sure we know when the playing stopped
+};
+
+#endif /* PSP_AUDIO_H */