1 files changed, 229 insertions, 0 deletions

diff --git a/apps/codecs/libgme/hes_emu.h b/apps/codecs/libgme/hes_emu.h
new file mode 100644
index 0000000000..18dbe0d506
--- /dev/null
+++ b/apps/codecs/libgme/hes_emu.h
@@ -0,0 +1,229 @@
+// TurboGrafx-16/PC Engine HES music file emulator
+
+// Game_Music_Emu 0.5.2
+#ifndef HES_EMU_H
+#define HES_EMU_H
+
+#include "blargg_source.h"
+
+#include "multi_buffer.h"
+#include "rom_data.h"
+#include "hes_apu.h"
+#include "hes_apu_adpcm.h"
+#include "hes_cpu.h"
+#include "m3u_playlist.h"
+
+typedef short sample_t;
+
+enum { buf_size = 2048 };
+
+// HES file header
+enum { header_size = 0x20 };
+struct header_t
+{
+        byte tag [4];
+        byte vers;
+        byte first_track;
+        byte init_addr [2];
+        byte banks [8];
+        byte data_tag [4];
+        byte size [4];
+        byte addr [4];
+        byte unused [4];
+};
+
+
+struct timer_t {
+        hes_time_t last_time;
+        blargg_long count;
+        blargg_long load;
+        int raw_load;
+        byte enabled;
+        byte fired;
+};
+        
+struct vdp_t {
+        hes_time_t next_vbl;
+        byte latch;
+        byte control;
+};
+        
+struct irq_t {
+        hes_time_t timer;
+        hes_time_t vdp;
+        byte disables;
+};
+
+
+struct Hes_Emu {
+        hes_time_t play_period;
+        hes_time_t last_frame_hook;
+        int timer_base;
+        
+        struct timer_t timer;
+        struct vdp_t vdp;
+        struct irq_t irq;
+        
+        // Sound
+        long clock_rate_;
+        long sample_rate_;
+        unsigned buf_changed_count;
+        int voice_count_;
+        double tempo_;
+        double gain_;
+        
+        // track-specific
+        byte track_count;
+        volatile bool track_ended;
+        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
+        
+        // fading
+        blargg_long fade_start;
+        int fade_step;
+        
+        // silence detection
+        // Disable automatic end-of-track detection and skipping of silence at beginning
+        bool ignore_silence;
+        
+        int max_initial_silence;
+        int mute_mask_;
+        int silence_lookahead; // speed to run emulator when looking ahead for 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
+        
+        // Larger files at the end
+        // Header for currently loaded file
+        struct header_t header;
+        
+        // M3u Playlist
+        struct M3u_Playlist m3u;
+        
+        // Hes Cpu
+        byte* write_pages [page_count + 1]; // 0 if unmapped or I/O space       
+        struct Hes_Cpu cpu;
+        
+        struct Hes_Apu apu;
+        struct Hes_Apu_Adpcm adpcm;
+
+        struct Stereo_Buffer stereo_buf;
+        sample_t buf [buf_size];
+        
+        // rom & ram
+        struct Rom_Data rom;
+        byte sgx [3 * page_size + cpu_padding];
+};
+
+
+// Basic functionality
+// Initializes Hes_Emu structure
+void Hes_init( struct Hes_Emu* this );
+
+// Stops (clear) Hes_Emu structure
+void Hes_stop( struct Hes_Emu* this );
+
+// Loads a file from memory
+blargg_err_t Hes_load( struct Hes_Emu* this, void* data, long size );
+
+// Set output sample rate. Must be called only once before loading file.
+blargg_err_t Hes_set_sample_rate( struct Hes_Emu* this, long sample_rate );
+
+// Start a track, where 0 is the first track. Also clears warning string.
+blargg_err_t Hes_start_track( struct Hes_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 Hes_play( struct Hes_Emu* this, long count, sample_t* buf ) ICODE_ATTR;
+
+// Track status/control
+// Number of milliseconds (1000 msec = 1 second) played since ning of track
+long Track_tell( struct Hes_Emu* this );
+
+// Seek to new time in track. Seeking backwards or far forward can take a while.
+blargg_err_t Track_seek( struct Hes_Emu* this, long msec );
+
+// Skip n samples
+blargg_err_t Track_skip( struct Hes_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 Hes_Emu* this, long start_msec, long length_msec );
+
+// Get track length in milliseconds
+static inline long Track_get_length( struct Hes_Emu* this, int n )
+{
+        long 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 Hes_Emu* this, double );
+
+// Mute/unmute voice i, where voice 0 is first voice
+void Sound_mute_voice( struct Hes_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 Hes_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 Hes_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)
+
+int Cpu_read( struct Hes_Emu* this, hes_addr_t ) ICODE_ATTR;
+void Cpu_write( struct Hes_Emu* this, hes_addr_t, int ) ICODE_ATTR;
+void Cpu_write_vdp( struct Hes_Emu* this, int addr, int data ) ICODE_ATTR;
+int Cpu_done( struct Hes_Emu* this ) ICODE_ATTR;
+
+int Emu_cpu_read( struct Hes_Emu* this, hes_addr_t ) ICODE_ATTR;
+void Emu_cpu_write( struct Hes_Emu* this, hes_addr_t, int data ) ICODE_ATTR;
+
+static inline byte const* Emu_cpu_set_mmr( struct Hes_Emu* this, int page, int bank )
+{
+        this->write_pages [page] = 0;
+        if ( bank < 0x80 )
+                return Rom_at_addr( &this->rom, bank * (blargg_long) page_size );
+        
+        byte* data = 0;
+        switch ( bank )
+        {
+                case 0xF8:
+                        data = this->cpu.ram;
+                        break;
+                
+                case 0xF9:
+                case 0xFA:
+                case 0xFB:
+                        data = &this->sgx [(bank - 0xF9) * page_size];
+                        break;
+                
+                default:
+                        if ( bank != 0xFF ) {
+                                dprintf( "Unmapped bank $%02X\n", bank );
+                        }
+                        return this->rom.unmapped;
+        }
+        
+        this->write_pages [page] = data;
+        return data;
+}
+
+#endif