1 files changed, 89 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/hes_apu_adpcm.h b/lib/rbcodec/codecs/libgme/hes_apu_adpcm.h
new file mode 100644
index 0000000000..afe160bb9c
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/hes_apu_adpcm.h
@@ -0,0 +1,89 @@
+// Turbo Grafx 16 (PC Engine) ADPCM sound chip emulator
+
+// Game_Music_Emu 0.6-pre
+#ifndef HES_APU_ADPCM_H
+#define HES_APU_ADPCM_H
+
+#include "blargg_source.h"
+#include "blargg_common.h"
+#include "blip_buffer.h"
+
+enum { adpcm_amp_range = 2048 };
+enum { adpcm_osc_count = 1 }; // 0 <= chan < osc_count
+
+// Registers are at io_addr to io_addr+io_size-1
+enum { adpcm_io_addr = 0x1800 };
+enum { adpcm_io_size = 0x400 };
+
+struct State
+{
+        byte           pcmbuf [0x10000];
+        byte           port [0x10];
+        int            ad_sample;
+        int            ad_ref_index;
+        bool           ad_low_nibble;
+        int            freq;
+        unsigned short addr;
+        unsigned short writeptr;
+        unsigned short readptr;
+        unsigned short playptr;
+        byte           playflag;
+        byte           repeatflag;
+        int            length;
+        int            playlength;
+        int            playedsamplecount;
+        int            volume;
+        int            fadetimer;
+        int            fadecount;
+};
+
+struct Hes_Apu_Adpcm {
+        struct State state;
+        struct Blip_Synth synth;
+
+        struct Blip_Buffer* output;
+        blip_time_t  last_time;
+        int          next_timer;
+        int          last_amp;
+};
+
+// Init HES adpcm sound chip
+void Adpcm_init( struct Hes_Apu_Adpcm* this );
+
+// Rest HES adpcm sound chip
+void Adpcm_reset( struct Hes_Apu_Adpcm* this );
+
+// Sets buffer(s) to generate sound into, or 0 to mute. If only center is not 0,
+// output is mono.
+static inline void Adpcm_set_output( struct Hes_Apu_Adpcm* this, int chan, struct Blip_Buffer* center, struct Blip_Buffer* left, struct Blip_Buffer* right )
+{
+        // Must be silent (all NULL), mono (left and right NULL), or stereo (none NULL)
+        require( !center || (center && !left && !right) || (center && left && right) );
+        require( (unsigned) chan < adpcm_osc_count ); // fails if you pass invalid osc index
+
+#if defined(ROCKBOX)
+    (void) chan;
+#endif
+
+        if ( !center || !left || !right )
+        {
+                left  = center;
+                right = center;
+        }
+        
+        this->output = center;
+}
+
+// Emulates to time t, then writes data to addr
+void Adpcm_write_data( struct Hes_Apu_Adpcm* this, blip_time_t t, int addr, int data );
+        
+// Emulates to time t, then reads from addr
+int Adpcm_read_data( struct Hes_Apu_Adpcm* this, blip_time_t t, int addr );
+
+// Emulates to time t, then subtracts t from the current time.
+// OK if previous write call had time slightly after t.
+void Adpcm_end_frame( struct Hes_Apu_Adpcm* this,blip_time_t t );
+
+// Sets overall volume, where 1.0 is normal
+static inline void Adpcm_volume( struct Hes_Apu_Adpcm* this, int v )    { Synth_volume( &this->synth, (v*3)/5 / adpcm_osc_count / adpcm_amp_range ); }
+#endif