1 files changed, 172 insertions, 0 deletions

diff --git a/apps/codecs/libgme/ay_emu.h b/apps/codecs/libgme/ay_emu.h
new file mode 100644
index 0000000000..91252166e4
--- /dev/null
+++ b/apps/codecs/libgme/ay_emu.h
@@ -0,0 +1,172 @@
+// Sinclair Spectrum AY music file emulator
+
+// Game_Music_Emu 0.6-pre
+#ifndef AY_EMU_H
+#define AY_EMU_H
+
+#include "blargg_source.h"
+
+#include "multi_buffer.h"
+#include "z80_cpu.h"
+#include "ay_apu.h"
+#include "m3u_playlist.h"
+
+typedef short sample_t;
+
+// 64K memory to load code and data into before starting track. Caller
+// must parse the AY file.
+enum { mem_size = 0x10000 };
+enum { ram_addr = 0x4000 }; // where official RAM starts
+enum { buf_size = 2048 };
+
+// AY file header
+enum { header_size = 0x14 };
+struct header_t
+{
+        byte tag        [8];
+        byte vers;
+        byte player;
+        byte unused     [2];
+        byte author     [2];
+        byte comment    [2];
+        byte max_track;
+        byte first_track;
+        byte track_info [2];
+};
+
+struct file_t {
+        struct header_t const* header;
+        byte const* tracks;
+        byte const* end;    // end of file data
+};
+
+struct mem_t {
+        uint8_t padding1 [0x100];
+        uint8_t ram      [mem_size + 0x100];
+};
+
+struct Ay_Emu {
+        struct file_t file;
+
+        struct Blip_Buffer* beeper_output;
+        int          beeper_delta;
+        int          last_beeper;
+        int          beeper_mask;
+        
+        addr_t play_addr;
+        cpu_time_t play_period;
+        cpu_time_t next_play;
+        
+        int  cpc_latch;
+        bool spectrum_mode;
+        bool cpc_mode;
+        
+        // general
+        int max_initial_silence;
+        int voice_count;
+        int mute_mask_;
+        double tempo;
+        double gain;
+        
+        long sample_rate;
+        
+        // track-specific
+        int current_track;
+        int track_count;
+        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
+        volatile bool track_ended;
+        bool emu_track_ended_; // emulator has reached end of track
+        
+        // fading
+        blargg_long fade_start;
+        int fade_step;
+        
+        // silence detection
+        bool ignore_silence;
+        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
+
+        long clock_rate_;
+        unsigned buf_changed_count;
+        
+        // M3u Playlist
+        struct M3u_Playlist m3u;
+        
+        // large items
+        struct Ay_Apu apu;
+        sample_t buf [buf_size];
+        struct Stereo_Buffer stereo_buf; // NULL if using custom buffer
+        struct Z80_Cpu cpu;
+        struct mem_t mem;
+};
+
+// Basic functionality (see Gme_File.h for file loading/track info functions)
+void Ay_init( struct Ay_Emu* this );
+
+blargg_err_t Ay_load_mem( struct Ay_Emu* this, byte const in [], int size );
+
+// Set output sample rate. Must be called only once before loading file.
+blargg_err_t Ay_set_sample_rate( struct Ay_Emu* this, long sample_rate );
+
+// Start a track, where 0 is the first track. Also clears warning string.
+blargg_err_t Ay_start_track( struct Ay_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 Ay_play( struct Ay_Emu* this, long count, sample_t* buf );
+
+
+// Track status/control
+
+// Number of milliseconds (1000 msec = 1 second) played since beginning of track
+long Track_tell( struct Ay_Emu* this );
+
+// Seek to new time in track. Seeking backwards or far forward can take a while.
+blargg_err_t Track_seek( struct Ay_Emu* this, long msec );
+        
+// Skip n samples
+blargg_err_t Track_skip( struct Ay_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 Ay_Emu* this, long start_msec, long length_msec );
+
+// Get track length in milliseconds
+long Track_get_length( struct Ay_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 Ay_Emu* this, double t );
+        
+// Mute/unmute voice i, where voice 0 is first voice
+void Sound_mute_voice( struct Ay_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 Ay_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 Ay_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)
+void cpu_out( struct Ay_Emu* this, cpu_time_t, addr_t, int data );
+void cpu_out_( struct Ay_Emu* this, cpu_time_t, addr_t, int data );
+bool run_cpu( struct Ay_Emu* this, cpu_time_t end );
+
+static inline void disable_beeper( struct Ay_Emu *this )
+{
+        this->beeper_mask = 0;
+        this->last_beeper = 0;
+}
+        
+#endif