1 files changed, 262 insertions, 0 deletions

diff --git a/apps/codecs/libgme/nsf_emu.h b/apps/codecs/libgme/nsf_emu.h
new file mode 100644
index 0000000000..421425e339
--- /dev/null
+++ b/apps/codecs/libgme/nsf_emu.h
@@ -0,0 +1,262 @@
+// Nintendo NES/Famicom NSF music file emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef NSF_EMU_H
+#define NSF_EMU_H
+
+#include "rom_data.h"
+#include "multi_buffer.h"
+#include "nes_apu.h"
+#include "nes_cpu.h"
+#include "nsfe_info.h"
+#include "m3u_playlist.h"
+
+#ifndef NSF_EMU_APU_ONLY
+        #include "nes_namco_apu.h"
+        #include "nes_vrc6_apu.h"
+        #include "nes_fme7_apu.h"
+        #include "nes_fds_apu.h"
+        #include "nes_mmc5_apu.h"
+        #include "nes_vrc7_apu.h"
+#endif
+
+typedef short sample_t;
+
+// Sound chip flags
+enum {
+        vrc6_flag  = 1 << 0,
+        vrc7_flag  = 1 << 1,
+        fds_flag   = 1 << 2,
+        mmc5_flag  = 1 << 3,
+        namco_flag = 1 << 4,
+        fme7_flag  = 1 << 5
+};
+
+enum { fds_banks    = 2 };
+enum { bank_count   = fds_banks + 8 };
+
+enum { rom_begin = 0x8000 };
+enum { bank_select_addr = 0x5FF8 };
+enum { mem_size  = 0x10000 };   
+        
+// cpu sits here when waiting for next call to play routine
+enum { idle_addr = 0x5FF6 };
+enum { banks_addr = idle_addr };
+enum { badop_addr = bank_select_addr };
+
+enum { low_ram_size = 0x800 };
+enum { sram_size    = 0x2000 };
+enum { fdsram_size  = 0x6000 };
+enum { fdsram_offset = 0x2000 + page_size + 8 };
+enum { sram_addr = 0x6000 };
+enum { unmapped_size= page_size + 8 };
+
+enum { buf_size = 2048 };
+
+// NSF file header
+enum { header_size = 0x80 };
+struct header_t
+{
+        char tag [5];
+        byte vers;
+        byte track_count;
+        byte first_track;
+        byte load_addr [2];
+        byte init_addr [2];
+        byte play_addr [2];
+        char game [32];
+        char author [32];
+        char copyright [32];
+        byte ntsc_speed [2];
+        byte banks [8];
+        byte pal_speed [2];
+        byte speed_flags;
+        byte chip_flags;
+        byte unused [4];
+};
+
+struct Nsf_Emu {
+        // Play routine timing
+        nes_time_t next_play;
+        nes_time_t play_period;
+        int play_extra;
+        int play_delay;
+        struct registers_t saved_state; // of interrupted init routine
+        
+        int track_count;
+
+        // general
+        int max_initial_silence;
+        int voice_count;
+        int mute_mask_;
+        double tempo;
+        double gain;
+        
+        long sample_rate;
+        
+        // track-specific
+        int current_track;
+        blargg_long out_time;  // number of samples played since start of track
+        blargg_long emu_time;  // number of samples emulator has generated since start of track
+        bool emu_track_ended_; // emulator has reached end of track
+        volatile bool track_ended;
+        
+        // fading
+        blargg_long fade_start;
+        int fade_step;
+        
+        // silence detection
+        int silence_lookahead; // speed to run emulator when looking ahead for silence
+        bool ignore_silence;
+        long silence_time;     // number of samples where most recent silence began
+        long silence_count;    // number of samples of silence to play before using buf
+        long buf_remain;       // number of samples left in silence buffer
+
+        double clock_rate_;
+        long clock_rate__;
+        unsigned buf_changed_count;
+
+        // M3u Playlist
+        struct M3u_Playlist m3u;
+
+        // Larger items at the end
+        #ifndef NSF_EMU_APU_ONLY
+                byte mmc5_mul [2];
+                
+                struct Nes_Fds_Apu   fds;
+                struct Nes_Mmc5_Apu  mmc5;
+                struct Nes_Namco_Apu namco;
+                struct Nes_Vrc6_Apu  vrc6;
+                struct Nes_Fme7_Apu  fme7;
+                struct Nes_Vrc7_Apu  vrc7;
+        #endif
+        
+        struct Nes_Cpu cpu;
+        struct Nes_Apu apu;
+        
+        // Header for currently loaded file
+        struct header_t header;
+        
+        struct Stereo_Buffer stereo_buf;
+        struct Rom_Data rom;
+        
+        // Extended nsf info
+        struct Nsfe_Info info;
+        
+        sample_t buf [buf_size];
+        byte high_ram[fdsram_size + fdsram_offset];
+        byte low_ram [low_ram_size];
+};
+
+// Basic functionality (see Gme_File.h for file loading/track info functions)
+
+void Nsf_init( struct Nsf_Emu* this );
+blargg_err_t Nsf_load( struct Nsf_Emu* this, void* data, long size );
+blargg_err_t Nsf_post_load( struct Nsf_Emu* this );
+
+// Set output sample rate. Must be called only once before loading file.
+blargg_err_t Nsf_set_sample_rate( struct Nsf_Emu* this, long sample_rate );
+        
+// Start a track, where 0 is the first track. Also clears warning string.
+blargg_err_t Nsf_start_track( struct Nsf_Emu* this , int );
+        
+// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation
+// errors set warning string, and major errors also end track.
+blargg_err_t Nsf_play( struct Nsf_Emu* this, long count, sample_t* buf );
+
+void Nsf_clear_playlist( struct Nsf_Emu* this );
+void Nsf_disable_playlist( struct Nsf_Emu* this, bool b ); // use clear_playlist()
+
+// Track status/control
+
+// Number of milliseconds (1000 msec = 1 second) played since beginning of track
+long Track_tell( struct Nsf_Emu* this );
+
+// Seek to new time in track. Seeking backwards or far forward can take a while.
+blargg_err_t Track_seek( struct Nsf_Emu* this, long msec );
+
+// Skip n samples
+blargg_err_t Track_skip( struct Nsf_Emu* this, long n );
+
+// Set start time and length of track fade out. Once fade ends track_ended() returns
+// true. Fade time can be changed while track is playing.
+void Track_set_fade( struct Nsf_Emu* this, long start_msec, long length_msec );
+
+// Get track length in milliseconds
+long Track_length( struct Nsf_Emu* this, int n );
+
+// Sound customization
+
+// Adjust song tempo, where 1.0 = normal, 0.5 = half speed, 2.0 = double speed.
+// Track length as returned by track_info() assumes a tempo of 1.0.
+void Sound_set_tempo( struct Nsf_Emu* this, double t );
+
+// Mute/unmute voice i, where voice 0 is first voice
+void Sound_mute_voice( struct Nsf_Emu* this, int index, bool mute );
+
+// Set muting state of all voices at once using a bit mask, where -1 mutes them all,
+// 0 unmutes them all, 0x01 mutes just the first voice, etc.
+void Sound_mute_voices( struct Nsf_Emu* this, int mask );
+
+// Change overall output amplitude, where 1.0 results in minimal clamping.
+// Must be called before set_sample_rate().
+static inline void Sound_set_gain( struct Nsf_Emu* this, double g )
+{
+        assert( !this->sample_rate ); // you must set gain before setting sample rate
+        this->gain = g;
+}
+
+// Emulation (You shouldn't touch these)
+
+blargg_err_t run_clocks( struct Nsf_Emu* this, blip_time_t* duration, int );
+
+void map_memory( struct Nsf_Emu* this ) ICODE_ATTR;
+void write_bank( struct Nsf_Emu* this, int index, int data ) ICODE_ATTR;
+int cpu_read( struct Nsf_Emu* this, addr_t ) ICODE_ATTR;
+void cpu_write( struct Nsf_Emu* this, addr_t, int ) ICODE_ATTR;
+void push_byte( struct Nsf_Emu* this, int ) ICODE_ATTR;
+addr_t get_addr( byte const [] ) ICODE_ATTR;
+bool run_cpu_until( struct Nsf_Emu* this, nes_time_t end ) ICODE_ATTR;
+
+// Sets clocks between calls to play routine to p + 1/2 clock
+static inline void set_play_period( struct Nsf_Emu* this, int p ) { this->play_period = p; }
+        
+// Time play routine will next be called
+static inline nes_time_t play_time( struct Nsf_Emu* this ) { return this->next_play; }
+        
+// Emulates to at least time t. Might emulate a few clocks extra.
+void run_until( struct Nsf_Emu* this, nes_time_t t ) ICODE_ATTR;
+        
+// Runs cpu to at least time t and returns false, or returns true
+// if it encounters illegal instruction (halt).
+bool run_cpu_until( struct Nsf_Emu* this, nes_time_t t ) ICODE_ATTR;
+        
+// cpu calls through to these to access memory (except instructions)
+int  read_mem(  struct Nsf_Emu* this, addr_t ) ICODE_ATTR;
+void write_mem( struct Nsf_Emu* this, addr_t, int ) ICODE_ATTR;
+        
+// Address of play routine
+static inline addr_t play_addr( struct Nsf_Emu* this ) { return get_addr( this->header.play_addr ); }
+        
+// Same as run_until, except emulation stops for any event (routine returned,
+// play routine called, illegal instruction).
+void run_once( struct Nsf_Emu* this, nes_time_t ) ICODE_ATTR;
+        
+// Reads byte as cpu would when executing code. Only works for RAM/ROM,
+// NOT I/O like sound chips.
+int  read_code( struct Nsf_Emu* this, addr_t addr ) ICODE_ATTR;
+
+static inline byte* fdsram( struct Nsf_Emu* this )          { return &this->high_ram [fdsram_offset]; }
+static inline byte* sram( struct Nsf_Emu* this )            { return this->high_ram; }
+static inline byte* unmapped_code( struct Nsf_Emu* this )   { return &this->high_ram [sram_size]; }
+
+#ifndef NSF_EMU_APU_ONLY
+static inline int fds_enabled( struct Nsf_Emu* this )   { return this->header.chip_flags & fds_flag;   }
+static inline int vrc6_enabled( struct Nsf_Emu* this )  { return this->header.chip_flags & vrc6_flag;  }
+static inline int vrc7_enabled( struct Nsf_Emu* this )  { return this->header.chip_flags & vrc7_flag;  }
+static inline int mmc5_enabled( struct Nsf_Emu* this )  { return this->header.chip_flags & mmc5_flag;  }
+static inline int namco_enabled( struct Nsf_Emu* this ) { return this->header.chip_flags & namco_flag; }
+static inline int fme7_enabled( struct Nsf_Emu* this )  { return this->header.chip_flags & fme7_flag;  }
+#endif
+        
+#endif