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// 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"
#include "track_filter.h"
// 64K memory to load code and data into before starting track. Caller
// must parse the AY file.
#define mem_size (0x10000)
enum { ram_addr = 0x4000 }; // where official RAM starts
// 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 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;
// large items
struct setup_t tfilter;
struct Track_Filter track_filter;
struct Ay_Apu apu;
struct Multi_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 [], long size );
// Set output sample rate. Must be called only once before loading file.
blargg_err_t Ay_set_sample_rate( struct Ay_Emu* this, int 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, int count, sample_t* buf );
// Track status/control
// Number of milliseconds (1000 msec = 1 second) played since beginning of track
int 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, int msec );
// Skip n samples
blargg_err_t Track_skip( struct Ay_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 Ay_Emu* this, int start_msec, int length_msec );
// True if a track has reached its end
static inline bool Track_ended( struct Ay_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 Ay_Emu* this, bool disable )
{
this->track_filter.silence_ignored_ = disable;
}
// Get track length in milliseconds
int 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, int 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, 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_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
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