mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-27 06:12:19 +00:00
244 lines
8.5 KiB
C++
244 lines
8.5 KiB
C++
// Common interface to game music file emulators
|
|
|
|
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
|
|
#ifndef MUSIC_EMU_H
|
|
#define MUSIC_EMU_H
|
|
|
|
#include "Gme_File.h"
|
|
class Multi_Buffer;
|
|
|
|
struct Music_Emu : public Gme_File {
|
|
public:
|
|
// Basic functionality (see Gme_File.h for file loading/track info functions)
|
|
|
|
// Set output sample rate. Must be called only once before loading file.
|
|
blargg_err_t set_sample_rate( long sample_rate );
|
|
|
|
// specifies if all 8 voices get rendered to their own stereo channel
|
|
// default implementation of Music_Emu always returns not supported error (i.e. no multichannel support by default)
|
|
// derived emus must override this if they support multichannel rendering
|
|
virtual blargg_err_t set_multi_channel( bool is_enabled );
|
|
|
|
// Start a track, where 0 is the first track. Also clears warning string.
|
|
blargg_err_t start_track( int );
|
|
|
|
// Generate 'count' samples info 'buf'. Output is in stereo. Any emulation
|
|
// errors set warning string, and major errors also end track.
|
|
typedef short sample_t;
|
|
blargg_err_t play( long count, sample_t* buf );
|
|
|
|
// Informational
|
|
|
|
// Sample rate sound is generated at
|
|
long sample_rate() const;
|
|
|
|
// Index of current track or -1 if one hasn't been started
|
|
int current_track() const;
|
|
|
|
// Number of voices used by currently loaded file
|
|
int voice_count() const;
|
|
|
|
// Names of voices
|
|
const char** voice_names() const;
|
|
|
|
bool multi_channel() const;
|
|
|
|
// Track status/control
|
|
|
|
// Number of milliseconds (1000 msec = 1 second) played since beginning of track
|
|
long tell() const;
|
|
|
|
// Number of samples generated since beginning of track
|
|
long tell_samples() const;
|
|
|
|
// Seek to new time in track. Seeking backwards or far forward can take a while.
|
|
blargg_err_t seek( long msec );
|
|
|
|
// Equivalent to restarting track then skipping n samples
|
|
blargg_err_t seek_samples( long n );
|
|
|
|
// Skip n samples
|
|
blargg_err_t skip( long n );
|
|
|
|
// True if a track has reached its end
|
|
bool track_ended() const;
|
|
|
|
// 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 set_fade( long start_msec, long length_msec = 8000 );
|
|
|
|
// Disable automatic end-of-track detection and skipping of silence at beginning
|
|
void ignore_silence( bool disable = true );
|
|
|
|
// Info for current track
|
|
using Gme_File::track_info;
|
|
blargg_err_t track_info( track_info_t* out ) const;
|
|
|
|
// 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 set_tempo( double );
|
|
|
|
// Mute/unmute voice i, where voice 0 is first voice
|
|
void mute_voice( int index, bool mute = true );
|
|
|
|
// 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 mute_voices( int mask );
|
|
|
|
// Change overall output amplitude, where 1.0 results in minimal clamping.
|
|
// Must be called before set_sample_rate().
|
|
void set_gain( double );
|
|
|
|
// Request use of custom multichannel buffer. Only supported by "classic" emulators;
|
|
// on others this has no effect. Should be called only once *before* set_sample_rate().
|
|
virtual void set_buffer( Multi_Buffer* ) { }
|
|
|
|
// Enables/disables accurate emulation options, if any are supported. Might change
|
|
// equalizer settings.
|
|
void enable_accuracy( bool enable = true );
|
|
|
|
// Sound equalization (treble/bass)
|
|
|
|
// Frequency equalizer parameters (see gme.txt)
|
|
// See gme.h for definition of struct gme_equalizer_t.
|
|
typedef gme_equalizer_t equalizer_t;
|
|
|
|
// Current frequency equalizater parameters
|
|
equalizer_t const& equalizer() const;
|
|
|
|
// Set frequency equalizer parameters
|
|
void set_equalizer( equalizer_t const& );
|
|
|
|
// Construct equalizer of given treble/bass settings
|
|
static const equalizer_t make_equalizer( double treble, double bass )
|
|
{
|
|
const Music_Emu::equalizer_t e = { treble, bass,
|
|
0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
|
|
return e;
|
|
}
|
|
|
|
// Equalizer settings for TV speaker
|
|
static equalizer_t const tv_eq;
|
|
|
|
public:
|
|
Music_Emu();
|
|
~Music_Emu();
|
|
protected:
|
|
void set_max_initial_silence( int n ) { max_initial_silence = n; }
|
|
void set_silence_lookahead( int n ) { silence_lookahead = n; }
|
|
void set_voice_count( int n ) { voice_count_ = n; }
|
|
void set_voice_names( const char* const* names );
|
|
void set_track_ended() { emu_track_ended_ = true; }
|
|
double gain() const { return gain_; }
|
|
double tempo() const { return tempo_; }
|
|
void remute_voices();
|
|
blargg_err_t set_multi_channel_( bool is_enabled );
|
|
|
|
virtual blargg_err_t set_sample_rate_( long sample_rate ) = 0;
|
|
virtual void set_equalizer_( equalizer_t const& ) { }
|
|
virtual void enable_accuracy_( bool /* enable */ ) { }
|
|
virtual void mute_voices_( int mask ) = 0;
|
|
virtual void set_tempo_( double ) = 0;
|
|
virtual blargg_err_t start_track_( int ) = 0; // tempo is set before this
|
|
virtual blargg_err_t play_( long count, sample_t* out ) = 0;
|
|
virtual blargg_err_t skip_( long count );
|
|
protected:
|
|
virtual void unload();
|
|
virtual void pre_load();
|
|
virtual void post_load_();
|
|
private:
|
|
// general
|
|
equalizer_t equalizer_;
|
|
int max_initial_silence;
|
|
const char** voice_names_;
|
|
int voice_count_;
|
|
int mute_mask_;
|
|
double tempo_;
|
|
double gain_;
|
|
bool multi_channel_;
|
|
|
|
// returns the number of output channels, i.e. usually 2 for stereo, unlesss multi_channel_ == true
|
|
int out_channels() const { return this->multi_channel() ? 2*8 : 2; }
|
|
|
|
long sample_rate_;
|
|
blargg_long msec_to_samples( blargg_long msec ) const;
|
|
|
|
// track-specific
|
|
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
|
|
volatile bool track_ended_;
|
|
void clear_track_vars();
|
|
void end_track_if_error( blargg_err_t );
|
|
|
|
// fading
|
|
blargg_long fade_start;
|
|
int fade_step;
|
|
void handle_fade( long count, sample_t* out );
|
|
|
|
// silence detection
|
|
int silence_lookahead; // speed to run emulator when looking ahead for silence
|
|
bool ignore_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
|
|
enum { buf_size = 2048 };
|
|
blargg_vector<sample_t> buf;
|
|
void fill_buf();
|
|
void emu_play( long count, sample_t* out );
|
|
|
|
Multi_Buffer* effects_buffer;
|
|
friend Music_Emu* gme_internal_new_emu_( gme_type_t, int, bool );
|
|
friend void gme_set_stereo_depth( Music_Emu*, double );
|
|
};
|
|
|
|
// base class for info-only derivations
|
|
struct Gme_Info_ : Music_Emu
|
|
{
|
|
virtual blargg_err_t set_sample_rate_( long sample_rate );
|
|
virtual void set_equalizer_( equalizer_t const& );
|
|
virtual void enable_accuracy_( bool );
|
|
virtual void mute_voices_( int mask );
|
|
virtual void set_tempo_( double );
|
|
virtual blargg_err_t start_track_( int );
|
|
virtual blargg_err_t play_( long count, sample_t* out );
|
|
virtual void pre_load();
|
|
virtual void post_load_();
|
|
};
|
|
|
|
inline blargg_err_t Music_Emu::track_info( track_info_t* out ) const
|
|
{
|
|
return track_info( out, current_track_ );
|
|
}
|
|
|
|
inline long Music_Emu::sample_rate() const { return sample_rate_; }
|
|
inline const char** Music_Emu::voice_names() const { return voice_names_; }
|
|
inline int Music_Emu::voice_count() const { return voice_count_; }
|
|
inline int Music_Emu::current_track() const { return current_track_; }
|
|
inline bool Music_Emu::track_ended() const { return track_ended_; }
|
|
inline const Music_Emu::equalizer_t& Music_Emu::equalizer() const { return equalizer_; }
|
|
|
|
inline void Music_Emu::enable_accuracy( bool b ) { enable_accuracy_( b ); }
|
|
inline void Music_Emu::set_tempo_( double t ) { tempo_ = t; }
|
|
inline void Music_Emu::remute_voices() { mute_voices( mute_mask_ ); }
|
|
inline void Music_Emu::ignore_silence( bool b ) { ignore_silence_ = b; }
|
|
inline blargg_err_t Music_Emu::start_track_( int ) { return 0; }
|
|
|
|
inline void Music_Emu::set_voice_names( const char* const* names )
|
|
{
|
|
// Intentional removal of const, so users don't have to remember obscure const in middle
|
|
voice_names_ = const_cast<const char**> (names);
|
|
}
|
|
|
|
inline void Music_Emu::mute_voices_( int ) { }
|
|
|
|
inline void Music_Emu::set_gain( double g )
|
|
{
|
|
assert( !sample_rate() ); // you must set gain before setting sample rate
|
|
gain_ = g;
|
|
}
|
|
|
|
#endif
|