1 files changed, 52 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/nes_vrc7_apu.h b/lib/rbcodec/codecs/libgme/nes_vrc7_apu.h
new file mode 100644
index 0000000000..1f45a435db
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/nes_vrc7_apu.h
@@ -0,0 +1,52 @@
+// Konami VRC7 sound chip emulator
+
+#ifndef NES_VRC7_APU_H
+#define NES_VRC7_APU_H
+
+#include "blargg_common.h"
+#include "blip_buffer.h"
+
+#include "emu2413.h"
+
+enum { vrc7_osc_count = 6 };
+
+struct vrc7_osc_t {
+        struct Blip_Buffer* output;
+        int last_amp;
+};
+
+struct Nes_Vrc7_Apu {
+        OPLL opll;
+        int addr;
+        blip_time_t next_time;
+        struct vrc7_osc_t osc;
+        struct Blip_Synth synth;
+        e_uint32 mask;
+};
+
+// See Nes_Apu.h for reference
+void Vrc7_init( struct Nes_Vrc7_Apu* this );
+void Vrc7_reset( struct Nes_Vrc7_Apu* this );
+void Vrc7_set_rate( struct Nes_Vrc7_Apu* this, int r );
+void Vrc7_end_frame( struct Nes_Vrc7_Apu* this, blip_time_t );
+
+void Vrc7_write_reg( struct Nes_Vrc7_Apu* this, int reg );
+void Vrc7_write_data( struct Nes_Vrc7_Apu* this, blip_time_t, int data );
+
+void output_changed( struct Nes_Vrc7_Apu* this );
+static inline void Vrc7_set_output( struct Nes_Vrc7_Apu* this, int i, struct Blip_Buffer* buf )
+{
+        assert( (unsigned) i < vrc7_osc_count );
+        this->mask |= 1 << i;
+
+        // Will use OPLL_setMask to mute voices
+        if ( buf ) {
+                this->mask ^= 1 << i;
+                this->osc.output = buf;
+        }
+}
+
+// DB2LIN_AMP_BITS == 11, * 2
+static inline void Vrc7_volume( struct Nes_Vrc7_Apu* this, int v ) { Synth_volume( &this->synth, v / 3 / 4096 ); }
+
+#endif