1 files changed, 51 insertions, 0 deletions
diff --git a/gearboy/platforms/audio-shared/Sound_Queue.h b/gearboy/platforms/audio-shared/Sound_Queue.h
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+++ b/gearboy/platforms/audio-shared/Sound_Queue.h
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+
+// Simple sound queue for synchronous sound handling in SDL
+
+// Copyright (C) 2005 Shay Green. MIT license.
+
+#ifndef SOUND_QUEUE_H
+#define SOUND_QUEUE_H
+
+#include <SDL.h>
+
+// Simple SDL sound wrapper that has a synchronous interface
+class Sound_Queue {
+public:
+	Sound_Queue();
+	~Sound_Queue();
+
+	// Initialize with specified sample rate and channel count.
+	// Returns NULL on success, otherwise error string.
+	const char* start( long sample_rate, int chan_count = 1 );
+
+	// Number of samples in buffer waiting to be played
+	int sample_count() const;
+
+	// Write samples to buffer and block until enough space is available
+	typedef short sample_t;
+	void write( const sample_t*, int count, bool sync = true );
+
+	// Pointer to samples currently playing (for showing waveform display)
+	sample_t const* currently_playing() const { return currently_playing_; }
+
+	// Stop audio output
+	void stop();
+
+private:
+	enum { buf_size = 2048 };
+	enum { buf_count = 3 };
+	sample_t* volatile bufs;
+	SDL_sem* volatile free_sem;
+	sample_t* volatile currently_playing_;
+	int volatile read_buf;
+	int write_buf;
+	int write_pos;
+	bool sound_open;
+	bool sync_output;
+
+	sample_t* buf( int index );
+	void fill_buffer( Uint8*, int );
+	static void fill_buffer_( void*, Uint8*, int );
+};
+
+#endif