1 files changed, 55 insertions, 0 deletions

diff --git a/apps/codecs/libgme/hes_apu.h b/apps/codecs/libgme/hes_apu.h
new file mode 100644
index 0000000000..8a49a5afc7
--- /dev/null
+++ b/apps/codecs/libgme/hes_apu.h
@@ -0,0 +1,55 @@
+// Turbo Grafx 16 (PC Engine) PSG sound chip emulator
+
+// Game_Music_Emu 0.5.2
+#ifndef HES_APU_H
+#define HES_APU_H
+
+#include "blargg_common.h"
+#include "blip_buffer.h"
+
+enum { amp_range = 0x8000 };
+enum { osc_count = 6 };
+enum { start_addr = 0x0800 };
+enum { end_addr   = 0x0809 };
+
+struct Hes_Osc
+{
+        unsigned char wave [32];
+        short volume [2];
+        int last_amp [2];
+        int delay;
+        int period;
+        unsigned char noise;
+        unsigned char phase;
+        unsigned char balance;
+        unsigned char dac;
+        blip_time_t last_time;
+        
+        struct Blip_Buffer* outputs [2];
+        struct Blip_Buffer* chans [3];
+        unsigned noise_lfsr;
+        unsigned char control;
+};
+
+void Osc_run_until( struct Hes_Osc* this, struct Blip_Synth* synth, blip_time_t ) ICODE_ATTR;
+
+struct Hes_Apu {
+        struct Hes_Osc oscs [osc_count];
+        
+        int latch;
+        int balance;
+        struct Blip_Synth synth;
+};
+
+// Init HES apu sound chip
+void Apu_init( struct Hes_Apu* this );
+
+// Reset HES apu couns chip
+void Apu_reset( struct Hes_Apu* this );
+
+void Apu_osc_output( struct Hes_Apu* this, int index, struct Blip_Buffer* center, struct Blip_Buffer* left, struct Blip_Buffer* right ) ICODE_ATTR;
+void Apu_write_data( struct Hes_Apu* this, blip_time_t, int addr, int data ) ICODE_ATTR;
+void Apu_end_frame( struct Hes_Apu* this, blip_time_t ) ICODE_ATTR;
+
+static inline void Apu_volume( struct Hes_Apu* this, double v ) { Synth_volume( &this->synth, 1.8 / osc_count / amp_range * v ); }
+#endif