1 files changed, 61 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/ym2413_emu.h b/lib/rbcodec/codecs/libgme/ym2413_emu.h
new file mode 100644
index 0000000000..8f52b04fbd
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/ym2413_emu.h
@@ -0,0 +1,61 @@
+// YM2413 FM sound chip emulator interface
+
+// Game_Music_Emu 0.6-pre
+#ifndef YM2413_EMU_H
+#define YM2413_EMU_H
+
+#include "blargg_common.h"
+#include "emu2413.h"
+
+enum { out_chan_count = 2 }; // stereo
+enum { channel_count = 14 };
+enum { disabled_time = -1 };
+
+struct Ym2413_Emu  {
+        OPLL opll;
+                
+        // Impl
+        int last_time;
+        short* out;
+};
+
+void Ym2413_init( struct Ym2413_Emu* this );
+
+static inline bool Ym2413_supported( void ) { return true; }
+        
+// Sets output sample rate and chip clock rates, in Hz. Returns non-zero
+// if error.
+int Ym2413_set_rate( struct Ym2413_Emu* this, int sample_rate, int clock_rate );
+        
+// Resets to power-up state
+void Ym2413_reset( struct Ym2413_Emu* this );
+        
+// Mutes voice n if bit n (1 << n) of mask is set
+void Ym2413_mute_voices( struct Ym2413_Emu* this, int mask );
+        
+// Writes data to addr
+void Ym2413_write( struct Ym2413_Emu* this, int addr, int data );
+        
+// Runs and writes pair_count*2 samples to output
+void Ym2413_run( struct Ym2413_Emu* this, int pair_count, short* out );
+
+static inline void Ym2413_enable( struct Ym2413_Emu* this, bool b ) { this->last_time = b ? 0 : disabled_time; }
+static inline bool Ym2413_enabled( struct Ym2413_Emu* this ) { return this->last_time != disabled_time; }
+static inline void Ym2413_begin_frame( struct Ym2413_Emu* this, short* buf ) { this->out = buf; this->last_time = 0; }
+        
+static inline int Ym2413_run_until( struct Ym2413_Emu* this, int time )
+{
+        int count = time - this->last_time;
+        if ( count > 0 )
+        {
+                if ( this->last_time < 0 )
+                        return false;
+                this->last_time = time;
+                short* p = this->out;
+                this->out += count * out_chan_count;
+                Ym2413_run( this, count, p );
+        }
+        return true;
+}
+
+#endif