From 55cba1db948c3d6650a0d4162ffcd09ca73fe3a1 Mon Sep 17 00:00:00 2001
From: waker <wakeroid@gmail.com>
Date: Mon, 6 Jul 2009 22:43:23 +0200
Subject: added GME support ; added subtune support

---
 gme/Vgm_Emu.h | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 gme/Vgm_Emu.h

(limited to 'gme/Vgm_Emu.h')

diff --git a/gme/Vgm_Emu.h b/gme/Vgm_Emu.h
new file mode 100644
index 00000000..bcb784d5
--- /dev/null
+++ b/gme/Vgm_Emu.h
@@ -0,0 +1,84 @@
+// Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro VGM music file emulator
+
+// Game_Music_Emu 0.5.2
+#ifndef VGM_EMU_H
+#define VGM_EMU_H
+
+#include "Vgm_Emu_Impl.h"
+
+// Emulates VGM music using SN76489/SN76496 PSG, YM2612, and YM2413 FM sound chips.
+// Supports custom sound buffer and frequency equalization when VGM uses just the PSG.
+// FM sound chips can be run at their proper rates, or slightly higher to reduce
+// aliasing on high notes. Currently YM2413 support requires that you supply a
+// YM2413 sound chip emulator. I can provide one I've modified to work with the library.
+class Vgm_Emu : public Vgm_Emu_Impl {
+public:
+	// True if custom buffer and custom equalization are supported
+	// TODO: move into Music_Emu and rename to something like supports_custom_buffer()
+	bool is_classic_emu() const { return !uses_fm; }
+	
+	// Disable running FM chips at higher than normal rate. Will result in slightly
+	// more aliasing of high notes.
+	void disable_oversampling( bool disable = true ) { disable_oversampling_ = disable; }
+	
+	// VGM header format
+	enum { header_size = 0x40 };
+	struct header_t
+	{
+		char tag [4];
+		byte data_size [4];
+		byte version [4];
+		byte psg_rate [4];
+		byte ym2413_rate [4];
+		byte gd3_offset [4];
+		byte track_duration [4];
+		byte loop_offset [4];
+		byte loop_duration [4];
+		byte frame_rate [4];
+		byte noise_feedback [2];
+		byte noise_width;
+		byte unused1;
+		byte ym2612_rate [4];
+		byte ym2151_rate [4];
+		byte data_offset [4];
+		byte unused2 [8];
+	};
+	
+	// Header for currently loaded file
+	header_t const& header() const { return *(header_t const*) data; }
+	
+	static gme_type_t static_type() { return gme_vgm_type; }
+	
+public:
+	// deprecated
+	Music_Emu::load;
+	blargg_err_t load( header_t const& h, Data_Reader& in ) // use Remaining_Reader
+			{ return load_remaining_( &h, sizeof h, in ); }
+	byte const* gd3_data( int* size_out = 0 ) const; // use track_info()
+
+public:
+	Vgm_Emu();
+	~Vgm_Emu();
+protected:
+	blargg_err_t track_info_( track_info_t*, int track ) const;
+	blargg_err_t load_mem_( byte const*, long );
+	blargg_err_t set_sample_rate_( long sample_rate );
+	blargg_err_t start_track_( int );
+	blargg_err_t play_( long count, sample_t* );
+	blargg_err_t run_clocks( blip_time_t&, int );
+	void set_tempo_( double );
+	void mute_voices_( int mask );
+	void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
+	void update_eq( blip_eq_t const& );
+private:
+	// removed; use disable_oversampling() and set_tempo() instead
+	Vgm_Emu( bool oversample, double tempo = 1.0 );
+	double fm_rate;
+	long psg_rate;
+	long vgm_rate;
+	bool disable_oversampling_;
+	bool uses_fm;
+	blargg_err_t setup_fm();
+};
+
+#endif
-- 
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