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[vg.git] / src / vg / vg_audio.h

// Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved

#define MA_NO_GENERATION
#define MA_NO_DECODING
#define MA_NO_ENCODING
#define MINIAUDIO_IMPLEMENTATION
#include "dr_soft/miniaudio.h"

#define STB_VORBIS_MAX_CHANNELS 2
#include "stb/stb_vorbis.h"

#define SFX_MAX_SYSTEMS         32
//#define SFX_FLAG_ONESHOT      0x1
#define SFX_FLAG_STEREO         0x2
#define SFX_FLAG_REPEAT         0x4
#define SFX_FLAG_PERSISTENT 0x8
#define FADEOUT_LENGTH          4410
#define FADEOUT_DIVISOR         (1.f/(float)FADEOUT_LENGTH)

typedef struct sfx_vol_control sfx_vol_control;
typedef struct sfx_system sfx_system;

struct sfx_vol_control
{
        float val;
        const char *name;
};

struct sfx_system
{
        sfx_system *persisitent_source;
        int in_queue;

        // Source buffer start
        float *source, *replacement;
        
        u32 clip_start, clip_end, buffer_length;
        
        // Modifiers
        sfx_vol_control *vol_src;
        float   vol, cvol;
        
        // Info
        u32 ch, end, cur;
        u32 flags;
        
        // Effects
        u32 fadeout, fadeout_current;
        
        // Diagnostic
        const char *name;
};

// Set of up to 8 sound effects packed into one
typedef struct sfx_set sfx_set;
struct sfx_set
{
        float *main;
        char *sources;
        
        u32 segments[32];       //from->to,from->to ...
        u32 numsegments;
        u32 ch;
        u32 flags;
};

ma_device g_aud_device;
ma_device_config g_aud_dconfig;

// Thread 1 - audio engine ( spawned from miniaudio.h )
// ======================================================
sfx_system      sfx_sys[SFX_MAX_SYSTEMS];
int                     sfx_sys_len = 0;

// Thread 0 - Critical transfer section
// ======================================================
MUTEX_TYPE      sfx_mux_t01; // Resources share: 0 & 1

sfx_system      *sfx_q[SFX_MAX_SYSTEMS]; // Stuff changed
int                      sfx_q_len = 0;                  // How much

// x / 2
// ======================================================

// g_vol_master is never directly acessed by users
float g_master_volume = 1.f;

// Decompress entire vorbis stream into buffer
static float *sfx_vorbis_stream( const unsigned char *data, int len, int channels, u32 *samples )
{
        int err;
        stb_vorbis *pv = stb_vorbis_open_memory( data, len, &err, NULL );
        
        if( !pv )
        {
                vg_error( "stb_vorbis_open_memory() failed with error code: %i\n", err );
                return NULL;
        }
                
        u32 length_samples = stb_vorbis_stream_length_in_samples( pv );
        float *buffer = (float *)malloc( length_samples * channels * sizeof( float ));
        
        if( !buffer )
        {
                stb_vorbis_close( pv );
                vg_error( "out of memory while allocating sound resource\n" );
                return NULL;
        }
        
        int read_samples = stb_vorbis_get_samples_float_interleaved( pv, channels, buffer, length_samples * channels );
        if( read_samples != length_samples )
        {
                vg_warn( "| warning: sample count mismatch. Expected %u got %i\n", length_samples, read_samples );
                length_samples = read_samples;
        }
        
        stb_vorbis_close( pv );
        *samples = length_samples;
        return buffer;
}

static float *sfx_vorbis( const char *strFileName, int channels, u32 *samples )
{
        i64 len;
        void *filedata = vg_asset_read_s( strFileName, &len );
        
        if( filedata )
        {
                float *wav = sfx_vorbis_stream( filedata, len, channels, samples );
                free( filedata );
                return wav;
        }
        else
        {
                vg_error( "OGG load failed\n" );
                return NULL;
        }
}

typedef struct sfx_bgload sfx_bgload_t;
struct sfx_bgload
{
        char    *path;
        u32     channels;
        
        float *buffer;
        u32      samples;
        
        void    *user;
        
        void(*OnComplete)(sfx_bgload_t *inf);
};

// Thread worker for background load job
void *sfx_vorbis_a_t( void *_inf )
{
        sfx_bgload_t *info = _inf;
        
        // Load the ogg clip
        info->buffer = sfx_vorbis( info->path, info->channels, &info->samples );
        info->OnComplete( info );
        
        return NULL;
}

// Asynchronous resource load
int sfx_vorbis_a( const char *path, int channels, void(*OnComplete)(sfx_bgload_t *inf), void *user )
{
        vg_info( "background job started for: %s\n", path );
        
        sfx_bgload_t *params = malloc( sizeof( sfx_bgload_t ) );
        params->path = malloc( strlen( path ) + 1 );
        strcpy( params->path, path );
        params->OnComplete = OnComplete;
        params->user = user;
        params->channels = channels;

        return vg_thread_run( sfx_vorbis_a_t, params );
}

// Asynchronous load-to-system callback
struct sfx_vorbis_a_to_inf
{
        sfx_system  *sys;
        u32                     flags;
};

#define SFX_A_FLAG_AUTOSTART 0x1
#define SFX_A_FLAG_AUTOFREE  0x2

/*
static int sfx_save( sfx_system *sys );

// Asynchronous load-to-system callback
void sfx_vorbis_a_to_c( sfx_bgload_t *loadinf )
{
        struct sfx_vorbis_a_to_inf *inf = loadinf->user;
        
        // Mark buffer for deallocation if autofree is set
        if( inf->flags & SFX_A_FLAG_AUTOFREE )
                inf->sys->replacement = loadinf->buffer;
        else
                inf->sys->source = loadinf->buffer;
        
        inf->sys->end = loadinf->samples;
        
        if( inf->flags & SFX_A_FLAG_AUTOSTART )
                sfx_save( inf->sys );
        
        free( loadinf->path );
        free( loadinf );
        free( inf );
}

// Asynchronous vorbis load into audio system
void sfx_vorbis_a_to( sfx_system *sys, const char *strFileName, int channels, u32 flags )
{
        struct sfx_vorbis_a_to_inf *inf = malloc( sizeof( struct sfx_vorbis_a_to_inf ) );
        inf->flags = flags;
        inf->sys = sys;
        
        sys->ch = channels;
        
        if( !sfx_vorbis_a( strFileName, channels, sfx_vorbis_a_to_c, inf ) )
                free( inf );
}*/

// 0
// ======================================================

static int sfx_begin_edit( sfx_system *sys )
{
        MUTEX_LOCK( sfx_mux_t01 );
        
        if( sfx_q_len >= SFX_MAX_SYSTEMS && !sys->in_queue )
        {
                MUTEX_UNLOCK( sfx_mux_t01 );
                vg_warn( "Warning: No free space in sound queue\n" );           
                return 0;
        }
        
        return 1;
}

static void sfx_end_edit( sfx_system *sys )
{
        MUTEX_UNLOCK( sfx_mux_t01 );
}

// Mark change to be uploaded to queue system
static int sfx_push( sfx_system *sys )
{
        if( !sys->in_queue )
        {
                // Mark change in queue
                sfx_q[ sfx_q_len ++ ] = sys;
                sys->in_queue = 1;
        }
        
        MUTEX_UNLOCK( sfx_mux_t01 );
        
        return 1;
}

// Edit a volume float, has to be function wrapped because of mutex
static void sfx_vol_fset( sfx_vol_control *src, float to )
{
        MUTEX_LOCK( sfx_mux_t01 );

        src->val = to;

        MUTEX_UNLOCK( sfx_mux_t01 );
}

// thread-safe get volume value
static float sfx_vol_fget( sfx_vol_control *src )
{
        float val;
        
        MUTEX_LOCK( sfx_mux_t01 );
        
        val = src->val;
        
        MUTEX_UNLOCK( sfx_mux_t01 );
        
        return val;
}

// thread-safe set master volume
static void sfx_set_master( float to )
{
        MUTEX_LOCK( sfx_mux_t01 );
        
        g_master_volume = to;
        
        MUTEX_UNLOCK( sfx_mux_t01 );
}

// thread-safe get master volume
static float sfx_get_master(void)
{
        float val;

        MUTEX_LOCK( sfx_mux_t01 );
        
        val = g_master_volume;
        
        MUTEX_UNLOCK( sfx_mux_t01 );
        
        return val;
}

void audio_mixer_callback( ma_device *pDevice, void *pOutBuf, const void *pInput, ma_uint32 frameCount );

// Miniaudio.h init
static void vg_audio_init(void)
{
        g_aud_dconfig = ma_device_config_init( ma_device_type_playback );
        g_aud_dconfig.playback.format   = ma_format_f32;
        g_aud_dconfig.playback.channels         = 2;
        g_aud_dconfig.sampleRate                        = 44100;
        g_aud_dconfig.dataCallback              = audio_mixer_callback;
        
        g_aud_dconfig.pUserData = NULL;
        
        vg_info( "Starting audio engine\n" );
        
        if( ma_device_init( NULL, &g_aud_dconfig, &g_aud_device ) != MA_SUCCESS )
        {
                vg_exiterr( "ma_device failed to initialize" );
        } 
        else 
        {       
                if( ma_device_start( &g_aud_device ) != MA_SUCCESS )
                {
                        ma_device_uninit( &g_aud_device );
                        vg_exiterr( "ma_device failed to start" );
                }
        }
}

// Shutdown audio device
static void vg_audio_free(void)
{
        ma_device_uninit( &g_aud_device );
}

// 1
// ======================================================

// Create and return slot for a sound
static sfx_system *sfx_alloc(void)
{
        if( sfx_sys_len >= SFX_MAX_SYSTEMS )
                return NULL;
        
        // A conditional is done against this in localization step,
        // Needs to be initialized.
        sfx_sys[ sfx_sys_len ].source = NULL;
        
        return sfx_sys + (sfx_sys_len++);
}

// Fetch samples into pcf
static void audio_mixer_getsamples( float *pcf, float *source, u32 cur, u32 ch )
{
        if( ch == 2 )
        {
                pcf[0] = source[ cur*2+0 ];
                pcf[1] = source[ cur*2+1 ];
        }
        else
        {
                pcf[0] = source[ cur ];
                pcf[1] = source[ cur ];
        }
}

// miniaudio.h interface
void audio_mixer_callback( ma_device *pDevice, void *pOutBuf, const void *pInput, ma_uint32 frameCount )
{
        // Process incoming sound queue
        MUTEX_LOCK( sfx_mux_t01 );
        
        while( sfx_q_len --> 0 )
        {
                sfx_system *src = sfx_q[sfx_q_len];
                sfx_system *clone;
                
                src->in_queue = 0;
                
                // Copy
                clone = sfx_alloc();
                *clone = *src;
                
                // Links need to exist on persistent sounds
                clone->persisitent_source = src->flags & SFX_FLAG_PERSISTENT? src: NULL;
        }
        
        sfx_q_len = 0;
        
        // Volume modifiers
        for( int i = 0; i < sfx_sys_len; i ++ )
        {
                sfx_system *sys = sfx_sys + i;
                
                // Apply persistent volume if linked
                if( sys->flags & SFX_FLAG_PERSISTENT )
                {
                        sys->vol = sys->persisitent_source->vol * g_master_volume;
                        
                        // Persistent triggers
                        // -------------------
                        
                        // Fadeout effect ( + remove )
                        if( sys->persisitent_source->fadeout )
                        {
                                sys->fadeout_current = sys->persisitent_source->fadeout_current;
                                sys->fadeout = sys->persisitent_source->fadeout;
                                
                                sys->persisitent_source = NULL;
                                sys->flags &= ~SFX_FLAG_PERSISTENT;
                        }
                }
                        
                // Apply volume slider if it has one linked
                if( sys->vol_src ) 
                        sys->cvol = sys->vol * sys->vol_src->val;
                else
                        sys->cvol = sys->vol;
        }
        
        MUTEX_UNLOCK( sfx_mux_t01 );
        
        // Clear buffer
        float *pOut32F = (float *)pOutBuf;
        for( int i = 0; i < frameCount * 2; i ++ ){
                pOut32F[i] = 0.f;
        }

        for( int i = 0; i < sfx_sys_len; i ++ )
        {
                sfx_system *sys = sfx_sys + i;
                
                u32 cursor = sys->cur, buffer_pos = 0;          
                float pcf[2] = { 0.f, 0.0f };
                
                u32 frames_write = frameCount;
                float fadeout_divisor = 1.0f / (float)sys->fadeout;
                
                while( frames_write )
                {
                        u32 samples_this_run = VG_MIN( frames_write, sys->end - cursor );
                
                        if( sys->fadeout )
                        {
                                // Force this system to be removed now
                                if( sys->fadeout_current == 0 )
                                {
                                        sys->flags &= 0x00000000;
                                        sys->cur = sys->end;
                                        break;
                                }
                                
                                samples_this_run = VG_MIN( samples_this_run, sys->fadeout_current );
                        }
                        
                        for( u32 j = 0; j < samples_this_run; j ++ )
                        {
                                audio_mixer_getsamples( pcf, sys->source, cursor, sys->ch );
                                
                                float vol = sys->vol;

                                if( sys->fadeout )
                                {
                                        vol *= (float)sys->fadeout_current * fadeout_divisor;
                                        sys->fadeout_current --;
                                }
                                
                                if( buffer_pos >= frameCount )
                                {
                                        break;
                                }

                                pOut32F[ buffer_pos*2+0 ] += pcf[0] * vol;
                                pOut32F[ buffer_pos*2+1 ] += pcf[1] * vol;
                                
                                cursor ++;
                                buffer_pos ++;
                        }
                        
                        frames_write -= samples_this_run;
                        
                        if( sys->flags & SFX_FLAG_REPEAT )
                        {
                                if( frames_write )
                                {
                                        cursor = 0;
                                        continue;
                                }
                        }

                        sys->cur = cursor;
                        break;
                }
        }

        // Redistribute sound systems
        MUTEX_LOCK( sfx_mux_t01 );

        u32 idx = 0, wr = 0;
        while( idx != sfx_sys_len )
        {
                sfx_system *src = sfx_sys + idx;
                
                // Keep only if cursor is before end or repeating
                if( src->cur < src->end || (src->flags & SFX_FLAG_REPEAT) ) 
                {
                        sfx_sys[ wr ++ ] = sfx_sys[ idx ];
                }
                
                idx ++ ;
        }
        sfx_sys_len = wr;
        
        MUTEX_UNLOCK( sfx_mux_t01 );
        
        (void)pInput;
}

// Load strings into sfx_set's memory
// String layout: "sounda.ogg\0soundb.ogg\0soundc.ogg\0\0"
static void sfx_set_strings( sfx_set *dest, char *strSources, u32 flags, int bAsync )
{
        dest->ch = (flags & SFX_FLAG_STEREO)? 2: 1;
        
        dest->main = NULL;
        dest->numsegments = 0;
        char *source = strSources;
        
        u32 total = 0;
        int len;
        while( (len = strlen( source )) )
        {
                u32 samples;
                float *sound = sfx_vorbis( source, dest->ch, &samples );
                
                if( !sound )
                {
                        free( dest->main );
                        dest->numsegments = 0;
                        return;
                }
                
                total += samples;
                
                float *nbuf = realloc( dest->main, total * dest->ch * sizeof(float) );
                
                if( nbuf )
                {
                        dest->main = nbuf;
                        memcpy( dest->main + (total-samples)*dest->ch, sound, samples*dest->ch*sizeof(float) );
                        free( sound );
                        
                        dest->segments[ dest->numsegments*2+0 ] = total-samples;
                        dest->segments[ dest->numsegments*2+1 ] = total;
                }
                else
                {
                        vg_error( "realloc() failed\n" );
                        free( sound );
                        return;
                }
                
                source += len +1;
                dest->numsegments ++;
        }
}

static void sfx_set_init( sfx_set *dest, char *sources )
{
        if( !sources )
                sfx_set_strings( dest, dest->sources, dest->flags, 0 );
        else
                sfx_set_strings( dest, sources, dest->flags, 0 );
}

static void sfx_set_play( sfx_set *source, sfx_system *sys, int id )
{
        if( sfx_begin_edit( sys ) )
        {
                sys->fadeout = 0;
                sys->fadeout_current = 0;
                sys->source = source->main;
                sys->cur        = source->segments[ id*2 + 0 ];
                sys->end        = source->segments[ id*2 + 1 ];
                sys->ch                 = source->ch;
                
                // Diagnostics
                sys->clip_start = sys->cur;
                sys->clip_end = sys->end;
                sys->buffer_length = source->segments[ (source->numsegments-1)*2 + 1 ];
                
                sfx_push( sys );
        }
}

// Pick a random sound from the buffer and play it into system
static void sfx_set_playrnd( sfx_set *source, sfx_system *sys, int min_id, int max_id )
{
        if( !source->numsegments )
                return;

        if( max_id > source->numsegments )
        {
                vg_error( "Max ID out of range for playrnd\n" );
                return; 
        }

        int pick = (rand() % (max_id-min_id)) + min_id;
        
        sfx_set_play( source, sys, pick );
}

static void sfx_system_fadeout( sfx_system *sys, u32 length_samples )
{
        if( sfx_begin_edit( sys ) )
        {
                sys->fadeout_current = length_samples;
                sys->fadeout = length_samples;
                
                sfx_end_edit( sys );
        }
}

// Free set resources
static void sfx_set_free( sfx_set *set )
{
        free( set->main );
}