1 files changed, 195 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/sgc_emu.h b/lib/rbcodec/codecs/libgme/sgc_emu.h
new file mode 100644
index 0000000000..83cde1e6ae
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/sgc_emu.h
@@ -0,0 +1,195 @@
+// Sega/Game Gear/Coleco SGC music file emulator
+
+// Game_Music_Emu 0.6-pre
+#ifndef SGC_EMU_H
+#define SGC_EMU_H
+
+#include "blargg_common.h"
+#include "multi_buffer.h"
+
+#include "rom_data.h"
+#include "z80_cpu.h"
+#include "sms_fm_apu.h"
+#include "sms_apu.h"
+#include "m3u_playlist.h"
+#include "track_filter.h"
+
+typedef struct Z80_Cpu Sgc_Cpu;
+
+// SGC file header
+enum { header_size = 0xA0 };
+struct header_t
+{
+        char tag       [4]; // "SGC\x1A"
+        byte vers;          // 0x01
+        byte rate;          // 0=NTSC 1=PAL
+        byte reserved1 [2];
+        byte load_addr [2];
+        byte init_addr [2];
+        byte play_addr [2];
+        byte stack_ptr [2];
+        byte reserved2 [2];
+        byte rst_addrs [7*2];
+        byte mapping   [4]; // Used by Sega only
+        byte first_song;    // Song to start playing first
+        byte song_count;
+        byte first_effect;
+        byte last_effect;
+        byte system;        // 0=Master System 1=Game Gear 2=Colecovision
+        byte reserved3 [23];
+        char game      [32]; // strings can be 32 chars, NOT terminated
+        char author    [32];
+        char copyright [32];
+};
+
+// True if header has valid file signature
+static inline bool valid_tag( struct header_t* h )
+{
+        return 0 == memcmp( h->tag, "SGC\x1A", 4 );     
+}
+
+static inline int effect_count( struct header_t* h ) { return h->last_effect ? h->last_effect - h->first_effect + 1 : 0; }
+
+struct Sgc_Emu {
+        bool fm_accessed;
+
+        cpu_time_t play_period;
+        cpu_time_t next_play;
+        void const* bank2;      // ROM selected for bank 2, in case RAM is currently hiding it
+        addr_t vectors_addr;    // RST vectors start here
+        addr_t idle_addr;       // return address for init/play routines
+        void* coleco_bios;
+        
+        // general
+        int voice_count;
+        int const* voice_types;
+        int mute_mask_;
+        int tempo;
+        int gain;
+        
+        int sample_rate;
+        
+        // track-specific
+        int current_track;
+        int track_count;
+
+        int clock_rate_;
+        unsigned buf_changed_count;
+        
+        // M3u Playlist
+        struct M3u_Playlist m3u;
+        struct header_t header;
+        
+        struct setup_t tfilter;
+        struct Track_Filter track_filter;
+        
+        struct Multi_Buffer stereo_buf;
+        
+        struct Sms_Apu apu;
+        struct Sms_Fm_Apu fm_apu;
+        
+        Sgc_Cpu cpu;
+        
+        // large items
+        struct Rom_Data rom;
+        byte vectors [page_size + page_padding];
+        byte unmapped_write [0x4000];
+        byte ram [0x2000 + page_padding];
+        byte ram2 [0x4000 + page_padding];
+};
+
+// Basic functionality (see Gme_File.h for file loading/track info functions)
+
+void Sgc_init( struct Sgc_Emu* this );
+
+blargg_err_t Sgc_load_mem( struct Sgc_Emu* this, const void* data, long size );
+
+static inline int clock_rate( struct Sgc_Emu* this ) { return this->header.rate ? 3546893 : 3579545; }
+
+// 0x2000 bytes
+static inline void set_coleco_bios( struct Sgc_Emu* this, void* p ) { this->coleco_bios = p; }
+
+// Set output sample rate. Must be called only once before loading file.
+blargg_err_t Sgc_set_sample_rate( struct Sgc_Emu* this, int sample_rate );
+
+// Start a track, where 0 is the first track. Also clears warning string.
+blargg_err_t Sgc_start_track( struct Sgc_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 Sgc_play( struct Sgc_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 Sgc_Emu* this );
+
+// Seek to new time in track. Seeking backwards or far forward can take a while.
+blargg_err_t Track_seek( struct Sgc_Emu* this, int msec );
+
+// Skip n samples
+blargg_err_t Track_skip( struct Sgc_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 Sgc_Emu* this, int start_msec, int length_msec );
+
+// True if a track has reached its end
+static inline bool Track_ended( struct Sgc_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 Sgc_Emu* this, bool disable )
+{
+        this->track_filter.silence_ignored_ = disable;
+}
+
+// Get track length in milliseconds
+static inline int Track_get_length( struct Sgc_Emu* this, int n )
+{
+        int length = 120 * 1000;  /* 2 minutes */ 
+        if ( (this->m3u.size > 0) && (n < this->m3u.size) ) {
+                struct entry_t* entry = &this->m3u.entries [n];
+                length = entry->length;
+        } 
+
+        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 Sgc_Emu* this, int t );
+
+// Mute/unmute voice i, where voice 0 is first voice
+void Sound_mute_voice( struct Sgc_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 Sgc_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 Sgc_Emu* this, int g )
+{
+        assert( !this->sample_rate ); // you must set gain before setting sample rate
+        this->gain = g;
+}
+
+// True if Master System or Game Gear
+static inline bool sega_mapping( struct Sgc_Emu* this )
+{
+        return this->header.system <= 1;
+}
+
+// Emulation (You shouldn't touch these)
+
+bool run_cpu( struct Sgc_Emu* this, cpu_time_t end_time );
+void cpu_out( struct Sgc_Emu* this, cpu_time_t time, addr_t addr, int data );
+void cpu_write( struct Sgc_Emu* this, addr_t addr, int data );
+void jsr( struct Sgc_Emu* this, byte addr [2] );
+
+#endif