1 files changed, 223 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/kss_emu.h b/lib/rbcodec/codecs/libgme/kss_emu.h
new file mode 100644
index 0000000000..382e4b807b
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/kss_emu.h
@@ -0,0 +1,223 @@
+// MSX computer KSS music file emulator
+
+// Game_Music_Emu 0.5.5
+#ifndef KSS_EMU_H
+#define KSS_EMU_H
+
+#include "gme.h"
+#include "blargg_common.h"
+
+#include "rom_data.h"
+#include "multi_buffer.h"
+
+#include "kss_scc_apu.h"
+#include "z80_cpu.h"
+#include "sms_apu.h"
+#include "ay_apu.h"
+#include "opl_apu.h"
+#include "m3u_playlist.h"
+#include "track_filter.h"
+
+typedef int kss_time_t;
+typedef int kss_addr_t;
+typedef struct Z80_Cpu Kss_Cpu;
+
+// Sound chip flags
+enum {
+        sms_psg_flag   = 1 << 0,
+        sms_fm_flag    = 1 << 1,
+        msx_psg_flag   = 1 << 2,
+        msx_scc_flag   = 1 << 3,
+        msx_music_flag = 1 << 4,
+        msx_audio_flag = 1 << 5
+};
+
+enum { idle_addr = 0xFFFF };
+enum { scc_enabled_true = 0xC000 };
+enum { mem_size = 0x10000 };
+
+// KSS file header
+enum { header_size = 0x20 };
+enum { header_base_size = 0x10 };
+enum { header_ext_size = header_size - header_base_size };
+
+struct header_t
+{
+        byte tag [4];
+        byte load_addr [2];
+        byte load_size [2];
+        byte init_addr [2];
+        byte play_addr [2];
+        byte first_bank;
+        byte bank_mode;
+        byte extra_header;
+        byte device_flags;
+        
+        // KSSX extended data, if extra_header==0x10
+        byte data_size [4];
+        byte unused [4];
+        byte first_track [2];
+        byte last_track [2]; // if no extended data, we set this to 0xFF
+        byte psg_vol;
+        byte scc_vol;
+        byte msx_music_vol;
+        byte msx_audio_vol;
+};
+
+struct sms_t {
+        struct Sms_Apu psg;
+        struct Opl_Apu fm;
+};
+
+struct msx_t {
+        struct Ay_Apu  psg;
+        struct Scc_Apu scc;
+        struct Opl_Apu music;
+        struct Opl_Apu audio;
+};
+
+struct Kss_Emu {
+        struct header_t header;
+        
+        int chip_flags;
+        bool scc_accessed;
+        bool gain_updated;
+        
+        unsigned scc_enabled; // 0 or 0xC000
+        int bank_count;
+        
+        blip_time_t play_period;
+        blip_time_t next_play;
+        int ay_latch;
+        
+        // general
+        int voice_count;
+        int const* voice_types;
+        int mute_mask_;
+        int tempo;
+        int gain;
+        
+        int sample_rate;
+        
+        // track-specific
+        int track_count;
+        int current_track;
+        
+        int clock_rate_;
+        unsigned buf_changed_count;
+        
+        // M3u Playlist
+        struct M3u_Playlist m3u;
+        
+        struct setup_t tfilter;
+        struct Track_Filter track_filter;
+        
+        struct sms_t sms;
+        struct msx_t msx;
+
+        Kss_Cpu cpu;
+        struct Multi_Buffer stereo_buf; // NULL if using custom buffer
+        struct Rom_Data rom;
+        
+        byte unmapped_read  [0x100];
+        byte unmapped_write [page_size];
+        byte ram [mem_size + cpu_padding];
+};
+
+// Basic functionality (see Gme_File.h for file loading/track info functions)
+
+void Kss_init( struct Kss_Emu* this );
+blargg_err_t Kss_load_mem( struct Kss_Emu* this, const void* data, long size );
+blargg_err_t end_frame( struct Kss_Emu* this, kss_time_t );
+
+// Set output sample rate. Must be called only once before loading file.
+blargg_err_t Kss_set_sample_rate( struct Kss_Emu* this, int sample_rate );
+
+// Start a track, where 0 is the first track. Also clears warning string.
+blargg_err_t Kss_start_track( struct Kss_Emu* this, int track );
+
+// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation
+// errors set warning string, and major errors also end track.
+blargg_err_t Kss_play( struct Kss_Emu* this, int count, sample_t* buf );
+
+// Track status/control
+
+// Number of milliseconds (1000 msec = 1 second) played since beginning of track
+int Track_tell( struct Kss_Emu* this );
+
+// Seek to new time in track. Seeking backwards or far forward can take a while.
+blargg_err_t Track_seek( struct Kss_Emu* this, int msec );
+
+// Skip n samples
+blargg_err_t Track_skip( struct Kss_Emu* this, int 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 Kss_Emu* this, int start_msec, int length_msec );
+
+// True if a track has reached its end
+static inline bool Track_ended( struct Kss_Emu* this )
+{
+        return track_ended( &this->track_filter );
+}
+
+// Disables automatic end-of-track detection and skipping of silence at beginning
+static inline void Track_ignore_silence( struct Kss_Emu* this, bool disable )
+{
+        this->track_filter.silence_ignored_ = disable;
+}
+
+// Get track length in milliseconds
+static inline int Track_get_length( struct Kss_Emu* this, int n )
+{
+        int length = 0;
+        
+        if ( (this->m3u.size > 0) && (n < this->m3u.size) ) {
+                struct entry_t* entry = &this->m3u.entries [n];
+                length = entry->length;
+        } 
+        
+        if ( length <= 0 )
+                length = 120 * 1000;  /* 2 minutes */ 
+
+        return length;
+}
+
+// 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 Kss_Emu* this, int t );
+
+// Mute/unmute voice i, where voice 0 is first voice
+void Sound_mute_voice( struct Kss_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 Kss_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 Kss_Emu* this, int g )
+{
+        assert( !this->sample_rate ); // you must set gain before setting sample rate
+        this->gain = g;
+}
+
+// Emulation (You shouldn't touch these
+void cpu_write( struct Kss_Emu* this, kss_addr_t, int );
+int  cpu_in( struct Kss_Emu* this, kss_time_t, kss_addr_t );
+void cpu_out( struct Kss_Emu* this, kss_time_t, kss_addr_t, int );
+
+void cpu_write_( struct Kss_Emu* this, kss_addr_t addr, int data );
+bool run_cpu( struct Kss_Emu* this, kss_time_t end );
+void jsr( struct Kss_Emu* this, byte const addr [] );
+
+static inline int sms_psg_enabled( struct Kss_Emu* this )   { return this->chip_flags & sms_psg_flag;  }
+static inline int sms_fm_enabled( struct Kss_Emu* this )    { return this->chip_flags & sms_fm_flag;   }
+static inline int msx_psg_enabled( struct Kss_Emu* this )   { return this->chip_flags & msx_psg_flag;  }
+static inline int msx_scc_enabled( struct Kss_Emu* this )   { return this->chip_flags & msx_scc_flag;  }
+static inline int msx_music_enabled( struct Kss_Emu* this ) { return this->chip_flags & msx_music_flag;}
+static inline int msx_audio_enabled( struct Kss_Emu* this ) { return this->chip_flags & msx_audio_flag;}
+
+#endif