-#ifndef VG_AUDIO_SYNTH_BIRD_H
-#define VG_AUDIO_SYNTH_BIRD_H
-
-#include "vg_binstr.h"
-#include "vg_stdint.h"
+#pragma once
#ifndef BIRD_SAMPLE_RATE
#define BIRD_SAMPLE_RATE 44100
#endif
-struct synth_bird_signature{
+struct synth_bird_signature
+{
float length, pause, /* timings in seconds */
x0,x1,x2,x3, /* polynomial coefficients for the fundemental */
v0,v1,v2,v3; /* volume of each oscillator */
float fm; /* LFO modulation depth (+/- hz) */
};
-struct synth_bird{
+struct synth_bird
+{
struct{
int osc_main[4],
osc_lfo;
settings;
};
-#define DEFAULT_VOL 1.0f,0.5f,0.2f,0.125f
-#define DEFAULT_TONES { {1,1}, {6,5}, {8,7}, {13,12} }
-#define DEFAULT_RISE 0.00090702947f
-#define DEFAULT_FALL 0.00226757369f
-
-static struct synth_bird_settings synth_bird__default_settings =
-{
- .tones = DEFAULT_TONES,
- .type = k_bird_lfo_sine_approx,
- .adsr_rise = DEFAULT_RISE,
- .adsr_fall = DEFAULT_FALL
-};
-
-static struct synth_bird_signature synth_bird__warbling_vireo[] =
-{
- /* timing fundemental volumes lfo hz,depth */
- {0.13,0.10, 4000,100,100,0, DEFAULT_VOL, 60,200 },
- {0.10,0.05, 4200,-500,1700,0, DEFAULT_VOL, 60,96 },
- {0.10,0.00, 2400,-1200,1000,1700, DEFAULT_VOL, 60,96 },
- {0.06,0.04, 3100,200,-10,-1100, DEFAULT_VOL, 60,90 },
- {0.13,0.07, 4600,-2000,0,1300, DEFAULT_VOL, 60,10 },
- {0.05,0.00, 2700,-300,700,800, DEFAULT_VOL, 60,10 },
- {0.09,0.07, 3600,-300,0,0, DEFAULT_VOL, 60,20 },
- {0.05,0.07, 4800,1240,300,0, DEFAULT_VOL, 60,20 },
- {0.08,0.02, 2700,-800,150,1000, DEFAULT_VOL, 60,160 },
- {0.12,0.08, 2700,-800,150,1000, DEFAULT_VOL, 60,160 },
- {0.10,0.04, 6300,-100,-3200,1000, DEFAULT_VOL, 60,100 },
- {0.16,0.10, 4260,-200,300,1100, DEFAULT_VOL, 60,20 }
-};
-
-static struct synth_bird_signature synth_bird__pied_monarch[] =
-{
- /* timing fundemental volumes lfo hz,depth */
- {0.18,0.13, 2200,700,-300,0, 0.6,0.05,0,0, 60,0 },
- {0.17,0.12, 2200,700,-300,0, 0.8,0.05,0,0, 60,0 },
- {0.16,0.11, 2200,700,-300,0, 0.9,0.05,0,0, 60,0 },
- {0.14,0.09, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.12,0.07, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.11,0.06, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.10,0.05, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.10,0.05, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.10,0.05, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.10,0.05, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.10,0.05, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 },
- {0.10,0.10, 2200,700,-300,0, 1.0,0.05,0,0, 60,0 }
-};
-
-static struct synth_bird_signature synth_bird__bridled_honeyeater[] =
-{
- /* timing fundemental volumes lfo hz,depth */
- {0.10,0.10, 2000,-1000,600,0, 1.00,0.00,0.00,0.00, 30,60},
- {0.10,0.10, 4000,0,-200,-200, 0.80,0.25,0.25,0.25, 30,60},
- {0.06,0.01, 4000,0,-700,-800, 0.90,0.10,0.00,0.00, 60,20},
- {0.07,0.01, 3950,0,-700,-800, 0.90,0.10,0.00,0.00, 60,20},
- {0.08,0.01, 3900,0,-700,-800, 0.90,0.10,0.00,0.00, 60,20},
- {0.09,0.01, 3850,0,-700,-800, 0.90,0.10,0.00,0.00, 60,20},
- {0.10,0.02, 3800,0,-700,-800, 0.90,0.20,0.10,0.00, 60,20},
- {0.11,0.05, 3750,0,-700,-800, 0.90,0.40,0.20,0.00, 60,20},
- {0.12,0.20, 3700,0,-700,-800, 0.30,0.10,0.00,0.00, 60,20},
- {0.10,0.10, 2600,1300,600,0, 0.97,0.03,0.00,0.00, 60,20},
-};
-
-static struct synth_bird_signature synth_bird__cricket[] =
-{
- /* timing fundemental volumes lfo hz, depth */
- {0.10,0.15, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.11,0.14, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.13,0.15, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.09,0.16, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.10,0.12, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.10,0.15, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.11,0.14, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.13,0.15, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.09,0.16, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200},
- {0.10,0.12, 5000,0,0,100, 0.25,0.25,0.25,0.25, 40,200}
-};
-
-static struct synth_bird_signature synth_bird__gray_shrikethrush[] =
-{
- /* timing fundemental volumes lfo hz, depth */
- { 0.13,0.1, 2600,-200,-100,200, 0.9,0.1,0.05,0.001, 60,10 }
-};
-
-static struct synth_bird_signature synth_bird__boobook[] =
-{
- /* timing fundemental volumes lfo hz, depth */
- {0.3,0.14, 700,0,-100,100, 0.9,0.14,0.0,0.2, 30,18},
- {0.3,1.20, 630,0,-100,100, 0.9,0.00,0.3,0.0, 30,18}
-};
-
-static struct synth_bird_signature synth_bird__shrike_tit[] =
-{
- /* timing fundemental volumes lfo hz, depth */
- {0.6,1.4, 2300,-300,-100,100, 1.0,0.14,0.0,0.1, 60,5 }
-};
-
-/* sine functions over the range [0, 44100] : [-pi, pi].
- * Not accurate! */
-
-static float sine_1second_1( int o )
-{
- float s = (o<(BIRD_SAMPLE_RATE/2))?-1.0f:1.0f;
- float t = ((float)o*(1.0f/(float)(BIRD_SAMPLE_RATE/2)))-1.0f - s*0.5f;
- float t2 = t*t;
- float t4 = t2*t2;
- return s*(5.0f*t2-4.0f*t4-1.0f);
-}
-
-static void sine_1second_4( int o[4], float v[4] )
-{
- float s[4],t[4],t2[4],t4[4];
- s[0] = (o[0]<(BIRD_SAMPLE_RATE/2))?-1.0f:1.0f;
- s[1] = (o[1]<(BIRD_SAMPLE_RATE/2))?-1.0f:1.0f;
- s[2] = (o[2]<(BIRD_SAMPLE_RATE/2))?-1.0f:1.0f;
- s[3] = (o[3]<(BIRD_SAMPLE_RATE/2))?-1.0f:1.0f;
-
- t[0] = ((float)o[0]*(1.0f/(float)(BIRD_SAMPLE_RATE/2)))-1.0f - s[0]*0.5f;
- t[1] = ((float)o[1]*(1.0f/(float)(BIRD_SAMPLE_RATE/2)))-1.0f - s[1]*0.5f;
- t[2] = ((float)o[2]*(1.0f/(float)(BIRD_SAMPLE_RATE/2)))-1.0f - s[2]*0.5f;
- t[3] = ((float)o[3]*(1.0f/(float)(BIRD_SAMPLE_RATE/2)))-1.0f - s[3]*0.5f;
-
- t2[0] = t[0]*t[0];
- t2[1] = t[1]*t[1];
- t2[2] = t[2]*t[2];
- t2[3] = t[3]*t[3];
-
- t4[0] = t2[0]*t2[0];
- t4[1] = t2[1]*t2[1];
- t4[2] = t2[2]*t2[2];
- t4[3] = t2[3]*t2[3];
-
- v[0] = s[0]*(5.0f*t2[0]-4.0f*t4[0]-1.0f);
- v[1] = s[1]*(5.0f*t2[1]-4.0f*t4[1]-1.0f);
- v[2] = s[2]*(5.0f*t2[2]-4.0f*t4[2]-1.0f);
- v[3] = s[3]*(5.0f*t2[3]-4.0f*t4[3]-1.0f);
-}
-
-static float saw_1second_1( int o )
-{
- float t = ((float)o*(1.0f/(float)(BIRD_SAMPLE_RATE/2)))-1.0f,
- tt = t*t,
- ttt = tt*t;
-
- return -2.5f*ttt+2.5f*t;
-}
-
-static u32 synth_bird_get_length_in_samples( struct synth_bird *bird )
-{
- u32 total = 0;
-
- for( int i=0; i<bird->settings.pattern_length; i ++ ){
- struct synth_bird_signature *sig = &bird->settings.pattern[i];
-
- u32 l = sig->length * (float)BIRD_SAMPLE_RATE,
- p = sig->pause * (float)BIRD_SAMPLE_RATE;
-
- total += l+p;
- }
-
- return total;
-}
-
-static void synth_bird_reset( struct synth_bird *bird )
-{
- bird->rt.osc_main[0] = 0;
- bird->rt.osc_main[1] = 0;
- bird->rt.osc_main[2] = 0;
- bird->rt.osc_main[3] = 0;
- bird->rt.osc_lfo = 0;
-
- bird->rt.volume[0] = 0.0f;
- bird->rt.volume[1] = 0.0f;
- bird->rt.volume[2] = 0.0f;
- bird->rt.volume[3] = 0.0f;
-
- bird->rt.fundamental = 0.0f;
- bird->rt.x = 0;
- bird->rt.length = bird->settings.pattern[0].length * (float)BIRD_SAMPLE_RATE;
- bird->rt.gate = 1;
- bird->rt.adsr = 0;
- bird->rt.frame = 0;
- bird->rt.lfo_hz = 0;
- bird->rt.fm_depth = 0.0f;
-
- bird->rt.adsr_rise = bird->settings.adsr_rise * (float)BIRD_SAMPLE_RATE;
- bird->rt.adsr_fall = bird->settings.adsr_fall * (float)BIRD_SAMPLE_RATE;
-}
-
-static u32 synth_bird_save_size( struct synth_bird *bird )
-{
- return sizeof(struct synth_bird_signature) * bird->settings.pattern_length +
- sizeof(struct synth_bird_settings);
-}
-
-static void synth_bird_save( struct synth_bird *bird, void *txt )
-{
- void *src = &bird->settings;
- vg_bin_str( src, txt, synth_bird_save_size( bird ) );
-}
-
-#if 0
-static void synth_bird_load( struct synth_bird *bird,
- const char *txt, u32 length )
-{
- vg_str_bin( txt, &bird->settings, length );
- synth_bird_reset( bird );
-}
-
-/* expects a null terminated string */
-static u32 synth_bird_memory_requirement( u32 string_length )
-{
- return (string_length/2) +
- sizeof(struct synth_bird) - sizeof(struct synth_bird_settings);
-}
-#endif
-
-#ifdef SYNTH_BIRD_STDLIB
-#include "stdlib.h"
-#include "string.h"
-
-static struct synth_bird *synth_bird_create(
- struct synth_bird_settings *settings,
- struct synth_bird_signature *pattern,
- u32 pattern_length )
-{
- u32 pattern_size = sizeof( struct synth_bird_signature ) * pattern_length;
- u32 total_size = sizeof( struct synth_bird ) + pattern_size;
- struct synth_bird *bird = malloc( total_size );
-
- bird->settings = *settings;
-
- memcpy( bird->settings.pattern, pattern, pattern_size );
- bird->settings.pattern_length = pattern_length;
-
- synth_bird_reset( bird );
- return bird;
-}
-
-#endif
-
-static void synth_bird_think( struct synth_bird *bird )
-{
- struct synth_bird_signature *sig = &bird->settings.pattern[ bird->rt.frame ];
-
- bird->rt.x ++;
- if( bird->rt.x >= bird->rt.length )
- {
- if( bird->rt.gate && (sig->pause != 0.0f) )
- {
- bird->rt.gate = 0;
- bird->rt.length = sig->pause * (float)BIRD_SAMPLE_RATE;
- }
- else
- {
- bird->rt.frame ++;
-
- if( bird->rt.frame >= bird->settings.pattern_length )
- bird->rt.frame = 0;
-
- sig = &bird->settings.pattern[ bird->rt.frame ];
-
- bird->rt.gate = 1;
- bird->rt.length = sig->length * (float)BIRD_SAMPLE_RATE;
- }
-
- bird->rt.x = 0;
- }
-
- if( bird->rt.gate )
- {
- bird->rt.adsr += bird->rt.adsr_rise;
- if( bird->rt.adsr > BIRD_SAMPLE_RATE )
- bird->rt.adsr = BIRD_SAMPLE_RATE;
- }
- else
- {
- bird->rt.adsr -= bird->rt.adsr_fall;
- if( bird->rt.adsr < 0 )
- bird->rt.adsr = 0;
- }
-
- if( bird->rt.gate )
- {
- float l = (float)bird->rt.length,
- t = ((float)bird->rt.x * (1.0f/l))*2.0f - 1.0f,
- tt = t*t,
- ttt = tt*t;
-
- bird->rt.fundamental = sig->x0 + t*sig->x1 + tt*sig->x2 + ttt*sig->x3;
- }
-
- float vol = (float)bird->rt.adsr * (1.0f/(float)BIRD_SAMPLE_RATE);
-
- bird->rt.fm_depth = sig->fm;
- bird->rt.lfo_hz = sig->lfo_hz;
- bird->rt.volume[0] = sig->v0 * vol;
- bird->rt.volume[1] = sig->v1 * vol;
- bird->rt.volume[2] = sig->v2 * vol;
- bird->rt.volume[3] = sig->v3 * vol;
-}
-
-static inline void int_add_mod( int *a, int const b )
-{
- *a += b;
-
- if( *a > BIRD_SAMPLE_RATE )
- *a -= BIRD_SAMPLE_RATE;
-}
-
-static void synth_bird_generate_samples( struct synth_bird *bird,
- float *stereo_buffer, int samples )
-{
- for( int _=0; _<samples; _++ )
- {
- synth_bird_think( bird );
-
- int_add_mod( &bird->rt.osc_lfo, bird->rt.lfo_hz );
- float fm = sine_1second_1( bird->rt.osc_lfo ) * bird->rt.fm_depth;
-
- int freq = bird->rt.fundamental + fm;
- int hz[4] =
- {
- (freq * bird->settings.tones[0][0]) / bird->settings.tones[0][1],
- (freq * bird->settings.tones[1][0]) / bird->settings.tones[1][1],
- (freq * bird->settings.tones[2][0]) / bird->settings.tones[2][1],
- (freq * bird->settings.tones[3][0]) / bird->settings.tones[3][1],
- };
-
- int_add_mod( bird->rt.osc_main + 0, hz[0] );
- int_add_mod( bird->rt.osc_main + 1, hz[1] );
- int_add_mod( bird->rt.osc_main + 2, hz[2] );
- int_add_mod( bird->rt.osc_main + 3, hz[3] );
-
- float v[4];
- sine_1second_4( bird->rt.osc_main, v );
-
- float s = v[0] * bird->rt.volume[0] +
- v[1] * bird->rt.volume[1] +
- v[2] * bird->rt.volume[2] +
- v[3] * bird->rt.volume[3] ;
-
- stereo_buffer[ _*2+0 ] = s;
- stereo_buffer[ _*2+1 ] = s;
- }
-}
-
-#ifdef SYNTH_BIRD_STDLIB
-#include "stdio.h"
-
-#define KNRM "\x1B[00m"
-#define KRED "\x1B[31m"
-#define KGRN "\x1B[32m"
-#define KYEL "\x1B[33m"
-#define KBLU "\x1B[34m"
-#define KMAG "\x1B[35m"
-#define KCYN "\x1B[36m"
-#define KWHT "\x1B[37m"
-
-#define LOG_BAR0 " . |"
-#define LOG_BAR1 "-------+-------+-------+-------+"
-#define LOG_BAR2 " "
-
-static void synth_bird_log_pattern( struct synth_bird *bird )
-{
- synth_bird_reset( bird );
-
- char output[][400]= {
-KNRM "9k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KNRM " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KNRM "8k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KNRM " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KNRM "7k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KNRM " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KMAG "6k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KMAG " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KCYN "5k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KCYN " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KBLU "4k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KBLU " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KGRN "3k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KGRN " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KYEL "2k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KYEL " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KRED "1k-" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KRED " -" LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0 LOG_BAR0,
-KWHT " +" LOG_BAR1 LOG_BAR1 LOG_BAR1 LOG_BAR1 LOG_BAR1
-KWHT " 0.0s"LOG_BAR2"0.5s"LOG_BAR2"1.0s"LOG_BAR2"1.5s"LOG_BAR2"2.0s"LOG_BAR2
- };
-
- for( int i=0; i<190*8; i++ )
- {
- for( int j=0; j<BIRD_SAMPLE_RATE/(32*8*2); j++ )
- synth_bird_think( bird );
-
- float hz = bird->rt.fundamental / 500.0f;
- int j = hz;
-
- if( j < 0 ) j = 0;
- if( j > 18 ) j = 18;
- j = 18-j;
-
- float level = bird->rt.adsr;
- level *= (1.0f/(float)BIRD_SAMPLE_RATE);
-
- int ch = level*3.0f;
-
- if( ch )
- output[j][(i/8)+7] = " *###"[ch];
- }
-
- for( int i=0; i<20; i++ )
- {
- puts( output[i] );
- }
-}
-#endif
-
-#endif /* VG_AUDIO_SYNTH_BIRD_H */
+void synth_bird_reset( struct synth_bird *bird );
+u32 synth_bird_get_length_in_samples( struct synth_bird *bird );
+void synth_bird_generate_samples( struct synth_bird *bird,
+ float *stereo_buffer, int samples );
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