apps/codecs/libgme/opl_apu.h

   1 #ifndef OPL_APU_H
   2 #define OPL_APU_H
   3
   4 #include "blargg_common.h"
   5 #include "blargg_source.h"
   6 #include "blip_buffer.h"
   7
   8 #include "emu8950.h"
   9 #include "emu2413.h"
  10
  11 enum opl_type_t { type_opll = 0x10, type_msxmusic = 0x11, type_smsfmunit = 0x12,
  12                         type_vrc7 = 0x13, type_msxaudio = 0x21 };
  13
  14 enum { opl_osc_count = 1 };
  15
  16 struct Opl_Apu {
  17         struct Blip_Buffer* output_;
  18         enum opl_type_t type_;
  19
  20         blip_time_t next_time;
  21         int last_amp;
  22         int addr;
  23
  24         long clock_;
  25         long rate_;
  26         blip_time_t period_;
  27
  28         struct Blip_Synth synth;
  29
  30         // OPL chips
  31         struct Y8950 opl;
  32         OPLL opll;
  33
  34         unsigned char regs[ 0x100 ];
  35         unsigned char opl_memory[ 32768 ];
  36 };
  37
  38 blargg_err_t Opl_init( struct Opl_Apu* this, long clock, long rate, blip_time_t period, enum opl_type_t type );
  39
  40 void Opl_reset( struct Opl_Apu* this );
  41 static inline void Opl_volume( struct Opl_Apu* this, double v ) { Synth_volume( &this->synth, 1.0 / (4096 * 6) * v ); }
  42
  43 static inline void Opl_osc_output( struct Opl_Apu* this, int i, struct Blip_Buffer* buf )
  44 {
  45 #if defined(ROCKBOX)
  46         (void) i;
  47 #endif
  48         assert( (unsigned) i < opl_osc_count );
  49         this->output_ = buf;
  50 }
  51
  52 static inline void Opl_set_output( struct Opl_Apu* this, struct Blip_Buffer* buf ) { Opl_osc_output( this, 0, buf ); }
  53 void Opl_end_frame( struct Opl_Apu* this, blip_time_t ) ICODE_ATTR;
  54
  55 static inline void Opl_write_addr( struct Opl_Apu* this, int data ) { this->addr = data; }
  56 void Opl_write_data( struct Opl_Apu* this, blip_time_t, int data ) ICODE_ATTR;
  57
  58 int Opl_read( struct Opl_Apu* this, blip_time_t, int port ) ICODE_ATTR;
  59
  60 static inline bool Opl_supported( void ) { return true; }
  61
  62 #endif