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audiosys.h
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audiosys.h
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/*
------------------------------------------------------------------------------
Licensing information can be found at the end of the file.
------------------------------------------------------------------------------
audiosys.h - v0.1 - Sound and music playback (mixing only) for C/C .
Do this:
#define AUDIOSYS_IMPLEMENTATION
before you include this file in *one* C/C file to create the implementation.
*/
#ifndef audiosys_h
#define audiosys_h
#ifndef AUDIOSYS_S16
#define AUDIOSYS_S16 signed short
#endif
#ifndef AUDIOSYS_U64
#define AUDIOSYS_U64 unsigned long long
#endif
#define AUDIOSYS_DEFAULT_VOICE_COUNT 16
typedef struct audiosys_audio_source_t {
void* instance;
void (*release)( void* instance );
int (*read_samples)( void* instance, float* sample_pairs, int sample_pairs_count );
void (*restart)( void* instance );
void (*set_position)( void* instance, int position_in_sample_pairs );
int (*get_position)( void* instance );
} audiosys_audio_source_t;
typedef struct audiosys_t audiosys_t;
audiosys_t* audiosys_create( int active_voice_count, void* memctx );
void audiosys_destroy( audiosys_t* audiosys );
void audiosys_render( audiosys_t* audiosys, AUDIOSYS_S16* output_sample_pairs, int sample_pairs_count );
void audiosys_master_volume_set( audiosys_t* audiosys, float volume );
float audiosys_master_volume( audiosys_t* audiosys );
void audiosys_gain_set( audiosys_t* audiosys, float gain );
float audiosys_gain( audiosys_t* audiosys );
void audiosys_pause( audiosys_t* audiosys );
void audiosys_resume( audiosys_t* audiosys );
void audiosys_stop_all( audiosys_t* audiosys );
typedef enum audiosys_paused_t {
AUDIOSYS_NOT_PAUSED,
AUDIOSYS_PAUSED,
} audiosys_paused_t;
audiosys_paused_t audiosys_paused( audiosys_t* audiosys );
typedef enum audiosys_loop_t {
AUDIOSYS_LOOP_OFF,
AUDIOSYS_LOOP_ON,
} audiosys_loop_t;
void audiosys_music_play( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_in_time );
void audiosys_music_stop( audiosys_t* audiosys, float fade_out_time );
void audiosys_music_pause( audiosys_t* audiosys );
void audiosys_music_resume( audiosys_t* audiosys );
void audiosys_music_switch( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_out_time, float fade_in_time );
void audiosys_music_cross_fade( audiosys_t* audiosys, audiosys_audio_source_t source, float cross_fade_time );
void audiosys_music_position_set( audiosys_t* audiosys, float position );
float audiosys_music_position( audiosys_t* audiosys );
audiosys_audio_source_t audiosys_music_source( audiosys_t* audiosys );
void audiosys_music_loop_set( audiosys_t* audiosys, audiosys_loop_t loop );
audiosys_loop_t audiosys_music_loop( audiosys_t* audiosys );
void audiosys_music_volume_set( audiosys_t* audiosys, float volume );
float audiosys_music_volume( audiosys_t* audiosys );
void audiosys_music_pan_set( audiosys_t* audiosys, float pan );
float audiosys_music_pan( audiosys_t* audiosys );
void audiosys_ambience_play( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_in_time );
void audiosys_ambience_stop( audiosys_t* audiosys, float fade_out_time );
void audiosys_ambience_pause( audiosys_t* audiosys );
void audiosys_ambience_resume( audiosys_t* audiosys );
void audiosys_ambience_switch( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_out_time, float fade_in_time );
void audiosys_ambience_cross_fade( audiosys_t* audiosys, audiosys_audio_source_t source, float cross_fade_time );
void audiosys_ambience_position_set( audiosys_t* audiosys, float position );
float audiosys_ambience_position( audiosys_t* audiosys );
audiosys_audio_source_t audiosys_ambience_source( audiosys_t* audiosys );
void audiosys_ambience_loop_set( audiosys_t* audiosys, audiosys_loop_t loop );
audiosys_loop_t audiosys_ambience_loop( audiosys_t* audiosys );
void audiosys_ambience_volume_set( audiosys_t* audiosys, float volume );
float audiosys_ambience_volume( audiosys_t* audiosys );
void audiosys_ambience_pan_set( audiosys_t* audiosys, float pan );
float audiosys_ambience_pan( audiosys_t* audiosys );
AUDIOSYS_U64 audiosys_sound_play( audiosys_t* audiosys, audiosys_audio_source_t source, float priority, float fade_in_time );
void audiosys_sound_stop( audiosys_t* audiosys, AUDIOSYS_U64 handle, float fade_out_time );
void audiosys_sound_pause( audiosys_t* audiosys, AUDIOSYS_U64 handle );
void audiosys_sound_resume( audiosys_t* audiosys, AUDIOSYS_U64 handle );
void audiosys_sound_position_set( audiosys_t* audiosys, AUDIOSYS_U64 handle, float position );
float audiosys_sound_position( audiosys_t* audiosys, AUDIOSYS_U64 handle );
audiosys_audio_source_t audiosys_sound_source( audiosys_t* audiosys, AUDIOSYS_U64 handle );
void audiosys_sound_loop_set( audiosys_t* audiosys, AUDIOSYS_U64 handle, audiosys_loop_t loop );
audiosys_loop_t audiosys_sound_loop( audiosys_t* audiosys, AUDIOSYS_U64 handle );
void audiosys_sound_volume_set( audiosys_t* audiosys, AUDIOSYS_U64 handle, float volume );
float audiosys_sound_volume( audiosys_t* audiosys, AUDIOSYS_U64 handle );
void audiosys_sound_pan_set( audiosys_t* audiosys, AUDIOSYS_U64 handle, float pan );
float audiosys_sound_pan( audiosys_t* audiosys, AUDIOSYS_U64 handle );
typedef enum audiosys_sound_valid_t {
AUDIOSYS_SOUND_INVALID,
AUDIOSYS_SOUND_VALID,
} audiosys_sound_valid_t;
audiosys_sound_valid_t audiosys_sound_valid(audiosys_t* audiosys, AUDIOSYS_U64 handle );
#endif /* audiosys_h */
/*
----------------------
IMPLEMENTATION
----------------------
*/
#ifdef AUDIOSYS_IMPLEMENTATION
#undef AUDIOSYS_IMPLEMENTATION
#ifndef AUDIOSYS_MALLOC
#define _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#define AUDIOSYS_MALLOC( ctx, size ) ( malloc( size ) )
#define AUDIOSYS_FREE( ctx, ptr ) ( free( ptr ) )
#endif
#ifndef AUDIOSYS_ASSERT
#undef _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_NONSTDC_NO_DEPRECATE
#undef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#include <assert.h>
#define AUDIOSYS_ASSERT( expression, message ) assert( ( expression ) && ( message ) )
#endif
#ifndef AUDIOSYS_MEMCPY
#define _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_SECURE_NO_WARNINGS
#include <string.h>
#define AUDIOSYS_MEMCPY( dst, src, cnt ) ( memcpy( (dst), (src), (cnt) ) )
#endif
#ifndef AUDIOSYS_MEMSET
#define _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_SECURE_NO_WARNINGS
#include <string.h>
#define AUDIOSYS_MEMSET( dst, val, cnt ) ( memset( (dst), (val), (cnt) ) )
#endif
#ifndef AUDIOSYS_MEMMOVE
#define _CRT_NONSTDC_NO_DEPRECATE
#define _CRT_SECURE_NO_WARNINGS
#include <string.h>
#define AUDIOSYS_MEMMOVE( dst, src, cnt ) ( memmove((dst), (src), (cnt) ) )
#endif
typedef struct audiosys_internal_handles_data_t {
int index;
int counter;
} audiosys_internal_handles_data_t;
typedef struct audiosys_internal_handles_t {
void* memctx;
struct audiosys_internal_handles_data_t* data;
int capacity;
int count;
int freelist_head;
int freelist_tail;
} audiosys_internal_handles_t;
static void audiosys_internal_handles_init( audiosys_internal_handles_t* handles, int initial_capacity, void* memctx ) {
handles->memctx = memctx;
handles->count = 0;
handles->capacity = initial_capacity <= 0 ? 1 : initial_capacity;
handles->freelist_head = -1;
handles->freelist_tail = -1;
handles->data = (struct audiosys_internal_handles_data_t*) AUDIOSYS_MALLOC( memctx, handles->capacity * sizeof( *handles->data ) );
AUDIOSYS_ASSERT( handles->data, "Allocation failed" );
}
static void audiosys_internal_handles_term( audiosys_internal_handles_t* handles ) {
//AUDIOSYS_FREE( handles->memctx, handles->data );
}
static int audiosys_internal_handles_alloc( audiosys_internal_handles_t* handles, int index ) {
int handle;
if( handles->count < handles->capacity ) {
handle = handles->count;
handles->data[ handles->count ].counter = 0;
handles->count;
} else if( handles->freelist_head >= 0 ) {
handle = handles->freelist_head;
if( handles->freelist_tail == handles->freelist_head ) handles->freelist_tail = handles->data[ handles->freelist_head ].index;
handles->freelist_head = handles->data[ handles->freelist_head ].index;
} else {
handles->capacity *= 2;
struct audiosys_internal_handles_data_t* new_data = (struct audiosys_internal_handles_data_t*) AUDIOSYS_MALLOC( handles->memctx, handles->capacity * sizeof( *handles->data ) );
AUDIOSYS_ASSERT( new_data, "Allocation failed" );
AUDIOSYS_MEMCPY( new_data, handles->data, handles->count * sizeof( *handles->data ) );
AUDIOSYS_FREE( handles->memctx, handles->data );
handles->data = new_data;
handle = handles->count;
handles->data[ handles->count ].counter = 0;
handles->count;
}
handles->data[ handle ].index = index;
return handle;
}
static void audiosys_internal_handles_release( audiosys_internal_handles_t* handles, int handle ) {
if( handles->freelist_tail < 0 ) {
AUDIOSYS_ASSERT( handles->freelist_head < 0, "Freelist invalid" );
handles->freelist_head = handle;
handles->freelist_tail = handle;
} else {
handles->data[ handles->freelist_tail ].index = handle;
handles->freelist_tail = handle;
}
handles->data[ handle ].counter; // invalidate handle via counter
handles->data[ handle ].index = -1;
}
static int audiosys_internal_handles_index( audiosys_internal_handles_t* handles, int handle ) {
if( handle >= 0 && handle < handles->count ) {
return handles->data[ handle ].index;
} else {
return -1;
}
}
static void audiosys_internal_handles_update( audiosys_internal_handles_t* handles, int handle, int index ) {
handles->data[ handle ].index = index;
}
static uint64_t audiosys_internal_to_u64( int handle, int counter ) {
uint64_t i = (uint64_t) ( handle 1 );
uint64_t c = (uint64_t) counter;
return ( c << 32ull ) | ( i );
}
static int audiosys_internal_u64_to_counter( uint64_t u ) {
return (int) ( u >> 32ull ) ;
}
static int audiosys_internal_u64_to_handle( uint64_t u ) {
return ( (int) ( u & 0xffffffffull ) ) - 1;
}
static uint64_t audiosys_internal_handles_to_u64( audiosys_internal_handles_t* handles, int handle ) {
return audiosys_internal_to_u64( handle, handles->data[ handle ].counter );
}
static int audiosys_internal_handles_from_u64( audiosys_internal_handles_t* handles, uint64_t u ) {
int handle = audiosys_internal_u64_to_handle( u );
if( handle >= 0 && handle < handles->count && handles->data[ handle ].counter == audiosys_internal_u64_to_counter( u ) ) {
return handle;
} else {
return -1;
}
}
typedef enum audiosys_internal_voice_state_t {
AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED,
AUDIOSYS_INTERNAL_VOICE_STATE_PLAYING,
AUDIOSYS_INTERNAL_VOICE_STATE_FADING_IN,
AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT,
AUDIOSYS_INTERNAL_VOICE_STATE_CROSSFADING,
AUDIOSYS_INTERNAL_VOICE_STATE_QUEUED,
} audiosys_internal_voice_state_t;
typedef struct audiosys_internal_voice_t {
AUDIOSYS_U64 handle;
audiosys_internal_voice_state_t state;
audiosys_audio_source_t source;
int initialized;
int paused;
int loop;
float priority;
float volume;
float pan;
float fade_in_time;
float fade_out_time;
float fade_progress;
float current_fade_volume;
float current_fade_delta;
} audiosys_internal_voice_t;
struct audiosys_t {
void* memctx;
int use_soft_clip;
int active_voice_count;
float master_volume;
float gain;
int paused;
audiosys_internal_voice_t music;
audiosys_internal_voice_t music_crossfade;
float music_crossfade_time;
audiosys_internal_voice_t ambience;
audiosys_internal_voice_t ambience_crossfade;
float ambience_crossfade_time;
int sounds_capacity;
int sounds_count;
AUDIOSYS_U64* sounds_by_priority;
audiosys_internal_voice_t* sounds;
audiosys_internal_handles_t sounds_handles;
int mixing_buffer_size;
float* mixing_buffer;
float* sample_buffer;
};
static void audiosys_internal_release_source( audiosys_audio_source_t* source ) {
if( source->release ) {
source->release( source->instance );
}
source->instance = NULL;
source->release = NULL;
source->read_samples = NULL;
source->restart = NULL;
source->set_position = NULL;
source->get_position = NULL;
}
audiosys_t* audiosys_create( int active_voice_count, void* memctx ) {
audiosys_t* audiosys = (audiosys_t*) AUDIOSYS_MALLOC( memctx, sizeof( audiosys_t ) );
AUDIOSYS_MEMSET( audiosys, 0, sizeof( audiosys_t ) );
audiosys->memctx = memctx;
audiosys->use_soft_clip = true;
audiosys->active_voice_count= active_voice_count;
audiosys->master_volume = 1.0f;
audiosys->gain = 1.0f;
audiosys->paused = 0;
audiosys->music.volume = 1.0f;
audiosys->music.loop = true;
audiosys->music_crossfade.volume = 1.0f;
audiosys->music_crossfade.loop = true;
audiosys->ambience.volume = 1.0f;
audiosys->ambience.loop = true;
audiosys->ambience_crossfade.volume = 1.0f;
audiosys->ambience_crossfade.loop = true;
audiosys->sounds_capacity = 64;
audiosys->sounds_count = 0;
audiosys->sounds_by_priority = (AUDIOSYS_U64*) AUDIOSYS_MALLOC( memctx, sizeof( AUDIOSYS_U64 ) * audiosys->sounds_capacity );
AUDIOSYS_MEMSET( audiosys->sounds_by_priority, 0, sizeof( AUDIOSYS_U64 ) * audiosys->sounds_capacity );
audiosys->sounds = (audiosys_internal_voice_t*) AUDIOSYS_MALLOC( memctx, sizeof( audiosys_internal_voice_t ) * audiosys->sounds_capacity );
audiosys_internal_handles_init( &audiosys->sounds_handles, audiosys->sounds_capacity, memctx );
return audiosys;
}
void audiosys_destroy( audiosys_t* audiosys ) {
audiosys_internal_release_source( &audiosys->music.source );
audiosys_internal_release_source( &audiosys->music_crossfade.source );
audiosys_internal_release_source( &audiosys->ambience.source );
audiosys_internal_release_source( &audiosys->ambience_crossfade.source );
for( int i = 0; i < audiosys->sounds_count; i ) {
audiosys_internal_release_source( &audiosys->sounds[ i ].source );
}
audiosys_internal_handles_term( &audiosys->sounds_handles );
AUDIOSYS_FREE( audiosys->memctx, audiosys->sounds_by_priority );
AUDIOSYS_FREE( audiosys->memctx, audiosys->sounds );
if( audiosys->mixing_buffer ) {
AUDIOSYS_FREE( audiosys->memctx, audiosys->mixing_buffer );
}
if( audiosys->sample_buffer ) {
AUDIOSYS_FREE( audiosys->memctx, audiosys->sample_buffer );
}
AUDIOSYS_FREE( audiosys->memctx, audiosys );
}
static audiosys_internal_voice_t* audiosys_internal_get_sound( audiosys_t* audiosys, AUDIOSYS_U64 handle ) {
int index = audiosys_internal_handles_index( &audiosys->sounds_handles, audiosys_internal_handles_from_u64( &audiosys->sounds_handles, handle ) );
if( index < 0 ) {
return 0;
}
return &audiosys->sounds[ index ];
}
static AUDIOSYS_U64 audiosys_internal_add_sound( audiosys_t* audiosys, audiosys_internal_voice_t** sound, float priority ) {
if( audiosys->sounds_count >= audiosys->sounds_capacity ) {
int new_capacity = audiosys->sounds_capacity * 2;
AUDIOSYS_U64* new_sounds_by_priority = (AUDIOSYS_U64*) AUDIOSYS_MALLOC( memctx, sizeof( AUDIOSYS_U64 ) * new_capacity );
audiosys_internal_voice_t* new_sounds = (audiosys_internal_voice_t*) AUDIOSYS_MALLOC( memctx, sizeof( audiosys_internal_voice_t ) * new_capacity );
AUDIOSYS_MEMCPY( new_sounds_by_priority, audiosys->sounds_by_priority, sizeof( AUDIOSYS_U64 ) * audiosys->sounds_count );
AUDIOSYS_MEMCPY( new_sounds, audiosys->sounds, sizeof( audiosys_internal_voice_t ) * audiosys->sounds_count );
AUDIOSYS_FREE( audiosys->memctx, audiosys->sounds_by_priority );
AUDIOSYS_FREE( audiosys->memctx, audiosys->sounds );
audiosys->sounds_capacity = new_capacity;
audiosys->sounds_by_priority = new_sounds_by_priority;
audiosys->sounds = new_sounds;
}
int index = audiosys->sounds_count;
if( audiosys->sounds_count > 0 ) {
int min_index = 0;
int max_index = audiosys->sounds_count - 1;
while( min_index <= max_index ) {
int center = ( max_index - min_index ) / 2 min_index;
audiosys_internal_voice_t* snd = audiosys_internal_get_sound( audiosys, audiosys->sounds_by_priority[ center ] );
float center_prio = snd->priority;
if( center_prio <= priority ) {
max_index = center - 1;
} else {
min_index = center 1;
}
}
index = min_index;
}
audiosys->sounds_count;
*sound = &audiosys->sounds[ audiosys->sounds_count - 1 ];
AUDIOSYS_U64 handle = audiosys_internal_handles_to_u64( &audiosys->sounds_handles, audiosys_internal_handles_alloc( &audiosys->sounds_handles, audiosys->sounds_count - 1 ) );
for( int i = audiosys->sounds_count - 1; i > index ; --i ) {
audiosys->sounds_by_priority[ i ] = audiosys->sounds_by_priority[ i - 1 ];
}
audiosys->sounds_by_priority[ index ] = handle;
return handle;
}
static void audiosys_internal_remove_sound( audiosys_t* audiosys, AUDIOSYS_U64 handle ) {
int index = audiosys_internal_handles_index( &audiosys->sounds_handles, audiosys_internal_handles_from_u64( &audiosys->sounds_handles, handle ) );
if( index < 0 ) {
return;
}
audiosys_internal_handles_release( &audiosys->sounds_handles, audiosys_internal_handles_from_u64( &audiosys->sounds_handles, handle ) );
audiosys_internal_voice_t* sound_to_remove = &audiosys->sounds[ index ];
audiosys_internal_release_source( &sound_to_remove->source );
for( int j = 0; j < audiosys->sounds_count; j ) {
if( audiosys->sounds_by_priority[ j ] == handle ) {
for( int i = j; i < audiosys->sounds_count - 1; i ) {
audiosys->sounds_by_priority[ i ] = audiosys->sounds_by_priority[ i 1 ];
}
break;
}
}
audiosys_internal_voice_t* last_sound = &audiosys->sounds[ audiosys->sounds_count - 1 ];
audiosys_internal_handles_update( &audiosys->sounds_handles, audiosys_internal_handles_from_u64( &audiosys->sounds_handles, last_sound->handle ), index );
--audiosys->sounds_count;
*sound_to_remove = *last_sound;
}
void audiosys_internal_update_fading( audiosys_internal_voice_t* voice, float delta_time ) {
if( !voice ) {
return;
}
float fade_volume = 1.0f;
float fade_delta = 0.0f;
if( voice->state == AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT && voice->fade_out_time > 0.0f ) {
voice->fade_progress -= delta_time / voice->fade_out_time;
if( voice->fade_progress <= 0.0f ) {
voice->fade_progress = 0.0f;
voice->state = AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED;
fade_volume = 0.0f;
audiosys_internal_release_source( &voice->source );
} else {
float volume_dec_per_second = 1.0f / voice->fade_out_time;
float volume_dec_per_sample = volume_dec_per_second / 44100.0f;
fade_volume = voice->fade_progress;
fade_volume = fade_volume < 0.0f ? 0.0f : fade_volume > 1.0f ? 1.0f : fade_volume;
fade_delta = -volume_dec_per_sample;
}
} else if( voice->state == AUDIOSYS_INTERNAL_VOICE_STATE_FADING_IN && voice->fade_in_time > 0.0f ) {
voice->fade_progress = delta_time / voice->fade_in_time;
if( voice->fade_progress >= 1.0f ) {
voice->fade_progress = 1.0f;
voice->state = AUDIOSYS_INTERNAL_VOICE_STATE_PLAYING;
fade_volume = 1.0f;
} else {
float volume_inc_per_second = 1.0f / voice->fade_in_time;
float volume_inc_per_sample = volume_inc_per_second / 44100.0f;
fade_volume = voice->fade_progress;
fade_volume = fade_volume < 0.0f ? 0.0f : fade_volume > 1.0f ? 1.0f : fade_volume;
fade_delta = volume_inc_per_sample;
}
}
voice->current_fade_volume = fade_volume;
voice->current_fade_delta = fade_delta;
}
void audiosys_internal_update_from_source( audiosys_t* audiosys, audiosys_internal_voice_t* voice, float* output_sample_pairs, int sample_pairs_count ) {
int samples_to_write = sample_pairs_count;
if( !voice->initialized ) {
audiosys_internal_update_fading( voice, 0.0f );
voice->initialized = 1;
} else {
audiosys_internal_update_fading( voice, sample_pairs_count / 44100.0f );
}
if( !voice->source.read_samples || voice->state == AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED ) {
AUDIOSYS_MEMSET( output_sample_pairs, 0, sample_pairs_count * sizeof( float ) * 2 );
return;
}
float* out = output_sample_pairs;
int count_written = voice->source.read_samples( voice->source.instance, out, samples_to_write );
out = count_written * 2;
while( count_written < samples_to_write ) {
if( voice->loop && voice->source.restart ) {
voice->source.restart( voice->source.instance );
int written = voice->source.read_samples( voice->source.instance, out, samples_to_write - count_written );
out = written * 2;
count_written = written;
} else {
audiosys_internal_release_source( &voice->source );
for( int i = 0; i < ( samples_to_write - count_written ) * 2; i ) {
out[ i ] = 0.0f;
}
return;
}
}
}
void audiosys_internal_mix_voice( audiosys_t* audiosys, audiosys_internal_voice_t* voice, float* sample_pairs, int sample_pairs_count ) {
if( !voice ) {
return;
}
audiosys_internal_update_from_source( audiosys, voice, sample_pairs, sample_pairs_count );
float fade_volume = voice->current_fade_volume;
float fade_delta = voice->current_fade_delta;
if( voice->pan < 0.0f && fade_delta != 0.0f ) {
float a = -voice->pan;
float ia = 1.0f - a;
for( int i = 0; i < sample_pairs_count; i ) {
float l = sample_pairs[ i * 2 0 ];
float r = sample_pairs[ i * 2 1 ];
float left = l a * r;
float right = r * ia;
left *= voice->volume * fade_volume * audiosys->master_volume;
right *= voice->volume * fade_volume * audiosys->master_volume;
audiosys->mixing_buffer[ i * 2 0 ] = left;
audiosys->mixing_buffer[ i * 2 1 ] = right;
fade_volume = fade_delta;
fade_volume = fade_volume < 0.0f ? 0.0f : fade_volume > 1.0f ? 1.0f : fade_volume;
}
} else if( voice->pan > 0.0f && fade_delta != 0.0f ) {
float a = voice->pan;
float ia = 1.0f - a;
for( int i = 0; i < sample_pairs_count; i ) {
float l = sample_pairs[ i * 2 0 ];
float r = sample_pairs[ i * 2 1 ];
float right = l * a r;
float left = l * ia;
left *= voice->volume * fade_volume * audiosys->master_volume;
right *= voice->volume * fade_volume * audiosys->master_volume;
audiosys->mixing_buffer[ i * 2 0 ] = left;
audiosys->mixing_buffer[ i * 2 1 ] = right;
fade_volume = fade_delta;
fade_volume = fade_volume < 0.0f ? 0.0f : fade_volume > 1.0f ? 1.0f : fade_volume;
}
} else if( voice->pan < 0.0f && fade_delta == 0.0f ) {
float a = -voice->pan;
float ia = 1.0f - a;
for( int i = 0; i < sample_pairs_count; i ) {
float l = sample_pairs[ i * 2 0 ];
float r = sample_pairs[ i * 2 1 ];
float left = l a * r;
float right = r * ia;
left *= voice->volume * fade_volume * audiosys->master_volume;
right *= voice->volume * fade_volume * audiosys->master_volume;
audiosys->mixing_buffer[ i * 2 0 ] = left;
audiosys->mixing_buffer[ i * 2 1 ] = right;
}
} else if( voice->pan > 0.0f && fade_delta == 0.0f ) {
float a = voice->pan;
float ia = 1.0f - a;
for( int i = 0; i < sample_pairs_count; i ) {
float l = sample_pairs[ i * 2 0 ];
float r = sample_pairs[ i * 2 1 ];
float right = l * a r;
float left = l * ia;
left *= voice->volume * fade_volume * audiosys->master_volume;
right *= voice->volume * fade_volume * audiosys->master_volume;
audiosys->mixing_buffer[ i * 2 0 ] = left;
audiosys->mixing_buffer[ i * 2 1 ] = right;
}
} else if( voice->pan == 0.0f && fade_delta != 0.0f ) {
for( int i = 0; i < sample_pairs_count; i ) {
float left = sample_pairs[ i * 2 0 ];
float right = sample_pairs[ i * 2 1 ];
left *= voice->volume * fade_volume * audiosys->master_volume;
right *= voice->volume * fade_volume * audiosys->master_volume;
audiosys->mixing_buffer[ i * 2 0 ] = left;
audiosys->mixing_buffer[ i * 2 1 ] = right;
fade_volume = fade_delta;
fade_volume = fade_volume < 0.0f ? 0.0f : fade_volume > 1.0f ? 1.0f : fade_volume;
}
} else if( voice->pan == 0.0f && fade_delta == 0.0f ) {
for( int i = 0; i < sample_pairs_count; i ) {
float left = sample_pairs[ i * 2 0 ];
float right = sample_pairs[ i * 2 1 ];
left *= voice->volume * fade_volume * audiosys->master_volume;
right *= voice->volume * fade_volume * audiosys->master_volume;
audiosys->mixing_buffer[ i * 2 0 ] = left;
audiosys->mixing_buffer[ i * 2 1 ] = right;
}
} else {
AUDIOSYS_ASSERT( false, "Invalid mix parameters" );
}
}
void audiosys_render( audiosys_t* audiosys, AUDIOSYS_S16* output_sample_pairs, int sample_pairs_count ) {
if( audiosys->paused ) {
AUDIOSYS_MEMSET( output_sample_pairs, 0, sample_pairs_count * sizeof( AUDIOSYS_S16 ) * 2 );
return;
}
if( audiosys->mixing_buffer_size < sample_pairs_count ) {
if( audiosys->mixing_buffer ) {
AUDIOSYS_FREE( audiosys->memctx, audiosys->mixing_buffer );
}
if( audiosys->sample_buffer ) {
AUDIOSYS_FREE( audiosys->memctx, audiosys->sample_buffer );
}
audiosys->mixing_buffer_size = sample_pairs_count;
audiosys->mixing_buffer = (float*) AUDIOSYS_MALLOC( audiosys->memctx, sample_pairs_count * sizeof( float ) * 2 );
audiosys->sample_buffer = (float*) AUDIOSYS_MALLOC( audiosys->memctx, sample_pairs_count * sizeof( float ) * 2 );
}
// remove sounds which have finished playing
for( int i = audiosys->sounds_count - 1; i >= 0; --i ) {
audiosys_internal_voice_t* voice = &audiosys->sounds[ i ];
if( voice->source.read_samples == NULL ) audiosys_internal_remove_sound( audiosys, voice->handle );
}
// clear buffer for mixing
for( int i = 0; i < sample_pairs_count * 2; i ) {
audiosys->mixing_buffer[ i ] = 0.0f;
}
// mix all active voices
audiosys_internal_mix_voice( audiosys, &audiosys->music, audiosys->sample_buffer, sample_pairs_count );
audiosys_internal_mix_voice( audiosys, &audiosys->music_crossfade, audiosys->sample_buffer, sample_pairs_count );
audiosys_internal_mix_voice( audiosys, &audiosys->ambience, audiosys->sample_buffer, sample_pairs_count );
audiosys_internal_mix_voice( audiosys, &audiosys->ambience_crossfade, audiosys->sample_buffer, sample_pairs_count );
int sounds_count = audiosys->active_voice_count;
for( int i = 0; i < sounds_count; i ) {
audiosys_internal_mix_voice( audiosys, audiosys_internal_get_sound( audiosys, audiosys->sounds_by_priority[ i ] ), audiosys->sample_buffer, sample_pairs_count );
}
if( audiosys->use_soft_clip ) {
for( int i = 0; i < sample_pairs_count * 2; i ) {
float s = audiosys->mixing_buffer[ i ];
s *= audiosys->gain * 0.5f;
s = s < -1.0f ? -2.0f / 3.0f : s > 1.0f ? 2.0f / 3.0f : s - ( s * s * s ) / 3; // soft clip
s *= 32000.0f;
output_sample_pairs[ i ] = (AUDIOSYS_S16)( s );
}
} else {
for( int i = 0; i < sample_pairs_count * 2; i ) {
float s = audiosys->mixing_buffer[ i ];
s *= audiosys->gain * 0.5f;
s = s < -1.0f ? -1.0f : s > 1.0f ? 1.0f : s;
s *= 32000.0f;
output_sample_pairs[ i ] = (AUDIOSYS_S16)( s );
}
}
}
void audiosys_master_volume_set( audiosys_t* audiosys, float volume ) {
audiosys->master_volume = volume < 0.0f ? 0.0f : volume > 1.0f ? 1.0f : volume;
}
float audiosys_master_volume( audiosys_t* audiosys ) {
return audiosys->master_volume;
}
void audiosys_gain_set( audiosys_t* audiosys, float gain ) {
audiosys->gain = gain;
}
float audiosys_gain( audiosys_t* audiosys ) {
return audiosys->gain;
}
void audiosys_pause( audiosys_t* audiosys ) {
audiosys->paused = 1;
}
void audiosys_resume( audiosys_t* audiosys ) {
audiosys->paused = 0;
}
void audiosys_stop_all( audiosys_t* audiosys ) {
audiosys_music_stop( audiosys, 0.0f );
audiosys_ambience_stop( audiosys, 0.0f );
for( int i = 0; i < audiosys->sounds_count; i ) {
audiosys_internal_voice_t* sound = &audiosys->sounds[ i ];
sound->state = AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED;
audiosys_internal_remove_sound( audiosys, sound->handle );
audiosys_internal_release_source( &sound->source );
}
}
audiosys_paused_t audiosys_paused( audiosys_t* audiosys ) {
return audiosys->paused ? AUDIOSYS_PAUSED : AUDIOSYS_NOT_PAUSED;
}
static void audiosys_internal_init_voice( audiosys_internal_voice_t* voice, audiosys_audio_source_t source, int is_sound ) {
voice->handle = 0;
voice->initialized = 0;
voice->paused = 0;
voice->state = AUDIOSYS_INTERNAL_VOICE_STATE_PLAYING;
voice->source = source;
if( is_sound ) {
voice->loop = 0;
voice->volume = 1.0f;
voice->pan = 0.0f;
}
voice->fade_in_time = 0.0f;
voice->fade_out_time = 0.0f;
voice->priority = 0.0f;
voice->fade_progress = 1.0f;
voice->current_fade_volume = 1.0f;
voice->current_fade_delta = 0.0f;
}
void audiosys_music_play( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_in_time ) {
audiosys_internal_release_source( &audiosys->music.source );
audiosys_internal_init_voice( &audiosys->music, source, 0 );
audiosys->music.fade_in_time = fade_in_time;
if( fade_in_time > 0.0f ) {
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_IN;
audiosys->music.fade_progress = 0.0f;
}
}
void audiosys_music_stop( audiosys_t* audiosys, float fade_out_time ) {
if( fade_out_time > 0.0f ) {
audiosys->music.fade_out_time = fade_out_time;
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT;
audiosys->music.fade_progress = 1.0f;
} else {
audiosys_internal_release_source( &audiosys->music.source );
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED;
}
}
void audiosys_music_pause( audiosys_t* audiosys ) {
if( audiosys->music.paused == 1 ) {
return;
}
audiosys->music.paused = 1;
}
void audiosys_music_resume( audiosys_t* audiosys ) {
if( audiosys->music.paused == 0 ) {
return;
}
audiosys->music.paused = 0;
}
void audiosys_music_switch( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_out_time, float fade_in_time ) {
if( fade_out_time > 0.0f ) {
audiosys->music.fade_out_time = fade_out_time;
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT;
audiosys->music.fade_progress = 1.0f;
} else {
audiosys_internal_release_source( &audiosys->music.source );
audiosys_music_play( audiosys, source, fade_in_time );
return;
}
audiosys_internal_voice_t temp = audiosys->music;
audiosys->music = audiosys->music_crossfade;
audiosys->music_crossfade = temp;
audiosys_internal_init_voice( &audiosys->music, source, 0 );
audiosys->music.fade_in_time = fade_in_time;
if( fade_in_time > 0.0f ) {
audiosys->music.fade_progress = 0.0f;
}
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_QUEUED;
}
void audiosys_music_cross_fade( audiosys_t* audiosys, audiosys_audio_source_t source, float cross_fade_time ) {
if( cross_fade_time > 0.0f ) {
audiosys->music.fade_out_time = cross_fade_time;
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT;
audiosys->music.fade_progress = 1.0f;
} else {
audiosys_internal_release_source( &audiosys->music.source );
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED;
}
audiosys_internal_voice_t temp = audiosys->music;
audiosys->music = audiosys->music_crossfade;
audiosys->music_crossfade = temp;
audiosys_internal_init_voice( &audiosys->music, source, 0 );
audiosys->music.fade_in_time = cross_fade_time;
if( cross_fade_time > 0.0f ) {
audiosys->music.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_IN;
audiosys->music.fade_progress = 0.0f;
}
}
void audiosys_music_position_set( audiosys_t* audiosys, float position ) {
if( !audiosys->music.source.set_position ) {
return;
}
audiosys->music.source.set_position( audiosys->music.source.instance, (int)( position * 44100.0f ) );
}
float audiosys_music_position( audiosys_t* audiosys ) {
if( !audiosys->music.source.get_position ) {
return 0.0f;
}
return audiosys->music.source.get_position( audiosys->music.source.instance ) / 44100.0f;
}
audiosys_audio_source_t audiosys_music_source( audiosys_t* audiosys ) {
return audiosys->music.source;
}
void audiosys_music_loop_set( audiosys_t* audiosys, audiosys_loop_t loop ) {
audiosys->music.loop = loop == AUDIOSYS_LOOP_ON ? 1 : 0;
}
audiosys_loop_t audiosys_music_loop( audiosys_t* audiosys ) {
return audiosys->music.loop ? AUDIOSYS_LOOP_ON : AUDIOSYS_LOOP_OFF;
}
void audiosys_music_volume_set( audiosys_t* audiosys, float volume ) {
audiosys->music.volume = volume;
}
float audiosys_music_volume( audiosys_t* audiosys ) {
return audiosys->music.volume;
}
void audiosys_music_pan_set( audiosys_t* audiosys, float pan ) {
audiosys->music.pan = pan < -1.0f ? -1.0f : pan > 1.0f ? 1.0f : pan;
}
float audiosys_music_pan( audiosys_t* audiosys ) {
return audiosys->music.pan;
}
void audiosys_ambience_play( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_in_time ) {
audiosys_internal_release_source( &audiosys->ambience.source );
audiosys_internal_init_voice( &audiosys->ambience, source, 0 );
audiosys->ambience.fade_in_time = fade_in_time;
if( fade_in_time > 0.0f ) {
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_IN;
audiosys->ambience.fade_progress = 0.0f;
}
}
void audiosys_ambience_stop( audiosys_t* audiosys, float fade_out_time ) {
if( fade_out_time > 0.0f ) {
audiosys->ambience.fade_out_time = fade_out_time;
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT;
audiosys->ambience.fade_progress = 1.0f;
} else {
audiosys_internal_release_source( &audiosys->ambience.source );
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED;
}
}
void audiosys_ambience_pause( audiosys_t* audiosys ) {
if( audiosys->ambience.paused == 1 ) {
return;
}
audiosys->ambience.paused = 1;
}
void audiosys_ambience_resume( audiosys_t* audiosys ) {
if( audiosys->ambience.paused == 0 ) {
return;
}
audiosys->ambience.paused = 0;
}
void audiosys_ambience_switch( audiosys_t* audiosys, audiosys_audio_source_t source, float fade_out_time, float fade_in_time ) {
if( fade_out_time > 0.0f ) {
audiosys->ambience.fade_out_time = fade_out_time;
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT;
} else {
audiosys_internal_release_source( &audiosys->ambience.source );
audiosys_ambience_play( audiosys, source, fade_in_time );
return;
}
audiosys_internal_voice_t temp = audiosys->ambience;
audiosys->ambience = audiosys->ambience_crossfade;
audiosys->ambience_crossfade = temp;
audiosys_internal_init_voice( &audiosys->ambience, source, 0 );
audiosys->ambience.fade_in_time = fade_in_time;
if( fade_in_time > 0.0f ) {
audiosys->ambience.fade_progress = 0.0f;
}
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_QUEUED;
}
void audiosys_ambience_cross_fade( audiosys_t* audiosys, audiosys_audio_source_t source, float cross_fade_time ) {
if( cross_fade_time > 0.0f ) {
audiosys->ambience.fade_out_time = cross_fade_time;
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_FADING_OUT;
audiosys->ambience.fade_progress = 1.0f;
} else {
audiosys_internal_release_source( &audiosys->ambience.source );
audiosys->ambience.state = AUDIOSYS_INTERNAL_VOICE_STATE_STOPPED;