mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-11-19 02:53:20 +00:00
82 lines
2 KiB
C++
82 lines
2 KiB
C++
// Sega Genesis/Mega Drive GYM music file emulator
|
|
// Includes with PCM timing recovery to improve sample quality.
|
|
|
|
// Game_Music_Emu 0.6.0
|
|
#ifndef GYM_EMU_H
|
|
#define GYM_EMU_H
|
|
|
|
#include "Dual_Resampler.h"
|
|
#include "Ym2612_Emu.h"
|
|
#include "Music_Emu.h"
|
|
#include "Sms_Apu.h"
|
|
|
|
class Gym_Emu : public Music_Emu, private Dual_Resampler {
|
|
public:
|
|
// GYM file header
|
|
enum { header_size = 428 };
|
|
struct header_t
|
|
{
|
|
char tag [4];
|
|
char song [32];
|
|
char game [32];
|
|
char copyright [32];
|
|
char emulator [32];
|
|
char dumper [32];
|
|
char comment [256];
|
|
byte loop_start [4]; // in 1/60 seconds, 0 if not looped
|
|
byte packed [4];
|
|
};
|
|
|
|
// Header for currently loaded file
|
|
header_t const& header() const { return header_; }
|
|
|
|
static gme_type_t static_type() { return gme_gym_type; }
|
|
|
|
public:
|
|
// deprecated
|
|
using Music_Emu::load;
|
|
blargg_err_t load( header_t const& h, Data_Reader& in ) // use Remaining_Reader
|
|
{ return load_remaining_( &h, sizeof h, in ); }
|
|
enum { gym_rate = 60 };
|
|
long track_length() const; // use track_info()
|
|
|
|
public:
|
|
Gym_Emu();
|
|
~Gym_Emu();
|
|
protected:
|
|
blargg_err_t load_mem_( byte const*, long );
|
|
blargg_err_t track_info_( track_info_t*, int track ) const;
|
|
blargg_err_t set_sample_rate_( long sample_rate );
|
|
blargg_err_t start_track_( int );
|
|
blargg_err_t play_( long count, sample_t* );
|
|
void mute_voices_( int );
|
|
void set_tempo_( double );
|
|
int play_frame( blip_time_t blip_time, int sample_count, sample_t* buf );
|
|
private:
|
|
// sequence data begin, loop begin, current position, end
|
|
const byte* data;
|
|
const byte* loop_begin;
|
|
const byte* pos;
|
|
const byte* data_end;
|
|
blargg_long loop_remain; // frames remaining until loop beginning has been located
|
|
header_t header_;
|
|
double fm_sample_rate;
|
|
blargg_long clocks_per_frame;
|
|
void parse_frame();
|
|
|
|
// dac (pcm)
|
|
int dac_amp;
|
|
int prev_dac_count;
|
|
bool dac_enabled;
|
|
bool dac_muted;
|
|
void run_dac( int );
|
|
|
|
// sound
|
|
Blip_Buffer blip_buf;
|
|
Ym2612_Emu fm;
|
|
Blip_Synth<blip_med_quality,1> dac_synth;
|
|
Sms_Apu apu;
|
|
byte dac_buf [1024];
|
|
};
|
|
|
|
#endif
|