1 files changed, 158 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6.0/gme/Multi_Buffer.h b/plugins/gme/game-music-emu-0.6.0/gme/Multi_Buffer.h
new file mode 100644
index 00000000..82c8b3ab
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6.0/gme/Multi_Buffer.h
@@ -0,0 +1,158 @@
+// Multi-channel sound buffer interface, and basic mono and stereo buffers
+
+// Blip_Buffer 0.4.1
+#ifndef MULTI_BUFFER_H
+#define MULTI_BUFFER_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+// Interface to one or more Blip_Buffers mapped to one or more channels
+// consisting of left, center, and right buffers.
+class Multi_Buffer {
+public:
+	Multi_Buffer( int samples_per_frame );
+	virtual ~Multi_Buffer() { }
+	
+	// Set the number of channels available
+	virtual blargg_err_t set_channel_count( int );
+	
+	// Get indexed channel, from 0 to channel count - 1
+	struct channel_t {
+		Blip_Buffer* center;
+		Blip_Buffer* left;
+		Blip_Buffer* right;
+	};
+	enum { type_index_mask = 0xFF };
+	enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type };
+	virtual channel_t channel( int index, int type ) = 0;
+	
+	// See Blip_Buffer.h
+	virtual blargg_err_t set_sample_rate( long rate, int msec = blip_default_length ) = 0;
+	virtual void clock_rate( long ) = 0;
+	virtual void bass_freq( int ) = 0;
+	virtual void clear() = 0;
+	long sample_rate() const;
+	
+	// Length of buffer, in milliseconds
+	int length() const;
+	
+	// See Blip_Buffer.h
+	virtual void end_frame( blip_time_t ) = 0;
+	
+	// Number of samples per output frame (1 = mono, 2 = stereo)
+	int samples_per_frame() const;
+	
+	// Count of changes to channel configuration. Incremented whenever
+	// a change is made to any of the Blip_Buffers for any channel.
+	unsigned channels_changed_count() { return channels_changed_count_; }
+	
+	// See Blip_Buffer.h
+	virtual long read_samples( blip_sample_t*, long ) = 0;
+	virtual long samples_avail() const = 0;
+	
+public:
+	BLARGG_DISABLE_NOTHROW
+protected:
+	void channels_changed() { channels_changed_count_++; }
+private:
+	// noncopyable
+	Multi_Buffer( const Multi_Buffer& );
+	Multi_Buffer& operator = ( const Multi_Buffer& );
+	
+	unsigned channels_changed_count_;
+	long sample_rate_;
+	int length_;
+	int const samples_per_frame_;
+};
+
+// Uses a single buffer and outputs mono samples.
+class Mono_Buffer : public Multi_Buffer {
+	Blip_Buffer buf;
+	channel_t chan;
+public:
+	// Buffer used for all channels
+	Blip_Buffer* center() { return &buf; }
+	
+public:
+	Mono_Buffer();
+	~Mono_Buffer();
+	blargg_err_t set_sample_rate( long rate, int msec = blip_default_length );
+	void clock_rate( long rate ) { buf.clock_rate( rate ); }
+	void bass_freq( int freq ) { buf.bass_freq( freq ); }
+	void clear() { buf.clear(); }
+	long samples_avail() const { return buf.samples_avail(); }
+	long read_samples( blip_sample_t* p, long s ) { return buf.read_samples( p, s ); }
+	channel_t channel( int, int ) { return chan; }
+	void end_frame( blip_time_t t ) { buf.end_frame( t ); }
+};
+
+// Uses three buffers (one for center) and outputs stereo sample pairs.
+class Stereo_Buffer : public Multi_Buffer {
+public:
+	
+	// Buffers used for all channels
+	Blip_Buffer* center()       { return &bufs [0]; }
+	Blip_Buffer* left()         { return &bufs [1]; }
+	Blip_Buffer* right()        { return &bufs [2]; }
+	
+public:
+	Stereo_Buffer();
+	~Stereo_Buffer();
+	blargg_err_t set_sample_rate( long, int msec = blip_default_length );
+	void clock_rate( long );
+	void bass_freq( int );
+	void clear();
+	channel_t channel( int, int ) { return chan; }
+	void end_frame( blip_time_t );
+	
+	long samples_avail() const { return bufs [0].samples_avail() * 2; }
+	long read_samples( blip_sample_t*, long );
+	
+private:
+	enum { buf_count = 3 };
+	Blip_Buffer bufs [buf_count];
+	channel_t chan;
+	int stereo_added;
+	int was_stereo;
+	
+	void mix_stereo_no_center( blip_sample_t*, blargg_long );
+	void mix_stereo( blip_sample_t*, blargg_long );
+	void mix_mono( blip_sample_t*, blargg_long );
+};
+
+// Silent_Buffer generates no samples, useful where no sound is wanted
+class Silent_Buffer : public Multi_Buffer {
+	channel_t chan;
+public:
+	Silent_Buffer();
+	blargg_err_t set_sample_rate( long rate, int msec = blip_default_length );
+	void clock_rate( long ) { }
+	void bass_freq( int ) { }
+	void clear() { }
+	channel_t channel( int, int ) { return chan; }
+	void end_frame( blip_time_t ) { }
+	long samples_avail() const { return 0; }
+	long read_samples( blip_sample_t*, long ) { return 0; }
+};
+
+
+inline blargg_err_t Multi_Buffer::set_sample_rate( long rate, int msec )
+{
+	sample_rate_ = rate;
+	length_ = msec;
+	return 0;
+}
+
+inline blargg_err_t Silent_Buffer::set_sample_rate( long rate, int msec )
+{
+	return Multi_Buffer::set_sample_rate( rate, msec );
+}
+
+inline int Multi_Buffer::samples_per_frame() const { return samples_per_frame_; }
+
+inline long Multi_Buffer::sample_rate() const { return sample_rate_; }
+
+inline int Multi_Buffer::length() const { return length_; }
+
+#endif