mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-11-18 02:01:39 +00:00
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
|
// Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro VGM music file emulator
|
||
|
|
|
||
|
|
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
|
||
|
|
#ifndef VGM_EMU_H
|
||
|
|
#define VGM_EMU_H
|
||
|
|
|
||
|
|
#include "Vgm_Emu_Impl.h"
|
||
|
|
|
||
|
|
// Emulates VGM music using SN76489/SN76496 PSG, YM2612, and YM2413 FM sound chips.
|
||
|
|
// Supports custom sound buffer and frequency equalization when VGM uses just the PSG.
|
||
|
|
// FM sound chips can be run at their proper rates, or slightly higher to reduce
|
||
|
|
// aliasing on high notes. Currently YM2413 support requires that you supply a
|
||
|
|
// YM2413 sound chip emulator. I can provide one I've modified to work with the library.
|
||
|
|
class Vgm_Emu : public Vgm_Emu_Impl {
|
||
|
|
public:
|
||
|
|
// True if custom buffer and custom equalization are supported
|
||
|
|
// TODO: move into Music_Emu and rename to something like supports_custom_buffer()
|
||
|
|
bool is_classic_emu() const { return !uses_fm; }
|
||
|
|
|
||
|
|
blargg_err_t set_multi_channel ( bool is_enabled ) override;
|
||
|
|
|
||
|
|
// Disable running FM chips at higher than normal rate. Will result in slightly
|
||
|
|
// more aliasing of high notes.
|
||
|
|
void disable_oversampling( bool disable = true ) { disable_oversampling_ = disable; }
|
||
|
|
|
||
|
|
// VGM header format
|
||
|
|
enum { header_size = 0x40 };
|
||
|
|
struct header_t
|
||
|
|
{
|
||
|
|
char tag [4];
|
||
|
|
byte data_size [4];
|
||
|
|
byte version [4];
|
||
|
|
byte psg_rate [4];
|
||
|
|
byte ym2413_rate [4];
|
||
|
|
byte gd3_offset [4];
|
||
|
|
byte track_duration [4];
|
||
|
|
byte loop_offset [4];
|
||
|
|
byte loop_duration [4];
|
||
|
|
byte frame_rate [4];
|
||
|
|
byte noise_feedback [2];
|
||
|
|
byte noise_width;
|
||
|
|
byte unused1;
|
||
|
|
byte ym2612_rate [4];
|
||
|
|
byte ym2151_rate [4];
|
||
|
|
byte data_offset [4];
|
||
|
|
byte unused2 [8];
|
||
|
|
};
|
||
|
|
|
||
|
|
// Header for currently loaded file
|
||
|
|
header_t const& header() const { return *(header_t const*) data; }
|
||
|
|
|
||
|
|
static gme_type_t static_type() { return gme_vgm_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 ); }
|
||
|
|
byte const* gd3_data( int* size_out = 0 ) const; // use track_info()
|
||
|
|
|
||
|
|
public:
|
||
|
|
Vgm_Emu();
|
||
|
|
~Vgm_Emu();
|
||
|
|
protected:
|
||
|
|
blargg_err_t track_info_( track_info_t*, int track ) const;
|
||
|
|
blargg_err_t load_mem_( byte const*, long );
|
||
|
|
blargg_err_t set_sample_rate_( long sample_rate );
|
||
|
|
blargg_err_t start_track_( int );
|
||
|
|
blargg_err_t play_( long count, sample_t* );
|
||
|
|
blargg_err_t run_clocks( blip_time_t&, int );
|
||
|
|
void set_tempo_( double );
|
||
|
|
void mute_voices_( int mask );
|
||
|
|
void set_voice( int, Blip_Buffer*, Blip_Buffer*, Blip_Buffer* );
|
||
|
|
void update_eq( blip_eq_t const& );
|
||
|
|
private:
|
||
|
|
// removed; use disable_oversampling() and set_tempo() instead
|
||
|
|
Vgm_Emu( bool oversample, double tempo = 1.0 );
|
||
|
|
double fm_rate;
|
||
|
|
long psg_rate;
|
||
|
|
long vgm_rate;
|
||
|
|
bool disable_oversampling_;
|
||
|
|
bool uses_fm;
|
||
|
|
blargg_err_t setup_fm();
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|