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106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
// Nintendo NES/Famicom NSF music file emulator
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef NSF_EMU_H
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#define NSF_EMU_H
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#include "Classic_Emu.h"
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#include "Nes_Apu.h"
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#include "Nes_Cpu.h"
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class Nsf_Emu : private Nes_Cpu, public Classic_Emu {
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typedef Nes_Cpu cpu;
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public:
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// Equalizer profiles for US NES and Japanese Famicom
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static equalizer_t const nes_eq;
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static equalizer_t const famicom_eq;
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// NSF file header
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enum { header_size = 0x80 };
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struct header_t
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{
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char tag [5];
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byte vers;
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byte track_count;
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byte first_track;
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byte load_addr [2];
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byte init_addr [2];
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byte play_addr [2];
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char game [32];
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char author [32];
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char copyright [32];
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byte ntsc_speed [2];
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byte banks [8];
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byte pal_speed [2];
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byte speed_flags;
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byte chip_flags;
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byte unused [4];
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};
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// Header for currently loaded file
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header_t const& header() const { return header_; }
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static gme_type_t static_type() { return gme_nsf_type; }
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public:
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// deprecated
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using Music_Emu::load;
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blargg_err_t load( header_t const& h, Data_Reader& in ) // use Remaining_Reader
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{ return load_remaining_( &h, sizeof h, in ); }
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public:
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Nsf_Emu();
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~Nsf_Emu();
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Nes_Apu* apu_() { return &apu; }
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protected:
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blargg_err_t track_info_( track_info_t*, int track ) const;
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blargg_err_t load_( Data_Reader& );
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blargg_err_t start_track_( int );
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blargg_err_t run_clocks( blip_time_t&, int );
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void set_tempo_( double );
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void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
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void update_eq( blip_eq_t const& );
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void unload();
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protected:
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enum { bank_count = 8 };
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byte initial_banks [bank_count];
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nes_addr_t init_addr;
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nes_addr_t play_addr;
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double clock_rate_;
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bool pal_only;
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// timing
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Nes_Cpu::registers_t saved_state;
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nes_time_t next_play;
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nes_time_t play_period;
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int play_extra;
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int play_ready;
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enum { rom_begin = 0x8000 };
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enum { bank_select_addr = 0x5FF8 };
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enum { bank_size = 0x1000 };
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Rom_Data<bank_size> rom;
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public: private: friend class Nes_Cpu;
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void cpu_jsr( nes_addr_t );
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int cpu_read( nes_addr_t );
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void cpu_write( nes_addr_t, int );
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void cpu_write_misc( nes_addr_t, int );
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enum { badop_addr = bank_select_addr };
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private:
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class Nes_Namco_Apu* namco;
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class Nes_Vrc6_Apu* vrc6;
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class Nes_Fme7_Apu* fme7;
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Nes_Apu apu;
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static int pcm_read( void*, nes_addr_t );
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blargg_err_t init_sound();
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header_t header_;
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enum { sram_addr = 0x6000 };
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byte sram [0x2000];
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byte unmapped_code [Nes_Cpu::page_size + 8];
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};
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#endif
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