1 files changed, 71 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/nes_namco_apu.h b/lib/rbcodec/codecs/libgme/nes_namco_apu.h
new file mode 100644
index 0000000000..c428c894c3
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/nes_namco_apu.h
@@ -0,0 +1,71 @@
+// Namco 106 sound chip emulator
+
+// Nes_Snd_Emu 0.1.8
+#ifndef NES_NAMCO_APU_H
+#define NES_NAMCO_APU_H
+
+#include "blargg_common.h"
+#include "blip_buffer.h"
+
+struct namco_state_t;
+
+enum { namco_osc_count = 8 };
+enum { namco_addr_reg_addr = 0xF800 };
+enum { namco_data_reg_addr = 0x4800 };
+enum { namco_reg_count = 0x80 };
+
+struct Namco_Osc {
+        int delay;
+        struct Blip_Buffer* output;
+        short last_amp;
+        short wave_pos;
+};
+
+struct Nes_Namco_Apu {
+        struct Namco_Osc oscs [namco_osc_count];
+        
+        blip_time_t last_time;
+        int addr_reg;
+        
+        uint8_t reg [namco_reg_count];
+
+        struct Blip_Synth synth;
+};
+
+// See Nes_Apu.h for reference.
+void Namco_init( struct Nes_Namco_Apu* this );
+void Namco_output( struct Nes_Namco_Apu* this, struct Blip_Buffer* );
+        
+void Namco_reset( struct Nes_Namco_Apu* this );
+void Namco_end_frame( struct Nes_Namco_Apu* this, blip_time_t );
+        
+static inline uint8_t* namco_access( struct Nes_Namco_Apu* this )
+{
+        int addr = this->addr_reg & 0x7F;
+        if ( this->addr_reg & 0x80 )
+                this->addr_reg = (addr + 1) | 0x80;
+        return &this->reg [addr];
+}
+
+static inline void Namco_volume( struct Nes_Namco_Apu* this, int v ) { Synth_volume( &this->synth, v / 10 / namco_osc_count / 15 ); }
+
+// Write-only address register is at 0xF800
+static inline void Namco_write_addr( struct Nes_Namco_Apu* this, int v ) { this->addr_reg = v; }
+
+static inline int Namco_read_data( struct Nes_Namco_Apu* this ) { return *namco_access( this ); }
+
+static inline void Namco_osc_output( struct Nes_Namco_Apu* this, int i, struct Blip_Buffer* buf )
+{
+        assert( (unsigned) i < namco_osc_count );
+        this->oscs [i].output = buf;
+}
+
+// Read/write data register is at 0x4800
+void Namco_run_until( struct Nes_Namco_Apu* this, blip_time_t );
+static inline void Namco_write_data( struct Nes_Namco_Apu* this, blip_time_t time, int data )
+{
+        Namco_run_until( this, time );
+        *namco_access( this ) = data;
+}
+
+#endif