v4k-git-backup/tools/sfxr2wav.c

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// -----------------------------
// sfxr - sound effect generator
// -----------------------------
// by DrPetter, 2007-12-14
// developed for LD48#10
// -----------------------------
//
// License:
// Basically, I don't care what you do with it, anything goes.
// To please all the troublesome folks who request a formal license,
// I attach the "MIT license".
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <stdbool.h>
#define rnd(n) (rand()%(n+1))
#define PI 3.14159265f
float frnd(float range)
{
return (float)rnd(10000)/10000*range;
}
typedef struct Category
{
char name[32];
} Category;
Category categories[10];
int wave_type;
float p_base_freq;
float p_freq_limit;
float p_freq_ramp;
float p_freq_dramp;
float p_duty;
float p_duty_ramp;
float p_vib_strength;
float p_vib_speed;
float p_vib_delay;
float p_env_attack;
float p_env_sustain;
float p_env_decay;
float p_env_punch;
bool filter_on;
float p_lpf_resonance;
float p_lpf_freq;
float p_lpf_ramp;
float p_hpf_freq;
float p_hpf_ramp;
float p_pha_offset;
float p_pha_ramp;
float p_repeat_speed;
float p_arp_speed;
float p_arp_mod;
float master_vol=0.05f;
float sound_vol=0.5f;
bool playing_sample=false;
int phase;
double fperiod;
double fmaxperiod;
double fslide;
double fdslide;
int period;
float square_duty;
float square_slide;
int env_stage;
int env_time;
int env_length[3];
float env_vol;
float fphase;
float fdphase;
int iphase;
float phaser_buffer[1024];
int ipp;
float noise_buffer[32];
float fltp;
float fltdp;
float fltw;
float fltw_d;
float fltdmp;
float fltphp;
float flthp;
float flthp_d;
float vib_phase;
float vib_speed;
float vib_amp;
int rep_time;
int rep_limit;
int arp_time;
int arp_limit;
double arp_mod;
float* vselected=NULL;
int vcurbutton=-1;
int wav_bits=16;
int wav_freq=44100;
int file_sampleswritten;
float filesample=0.0f;
int fileacc=0;
void ResetParams()
{
wave_type=0;
p_base_freq=0.3f;
p_freq_limit=0.0f;
p_freq_ramp=0.0f;
p_freq_dramp=0.0f;
p_duty=0.0f;
p_duty_ramp=0.0f;
p_vib_strength=0.0f;
p_vib_speed=0.0f;
p_vib_delay=0.0f;
p_env_attack=0.0f;
p_env_sustain=0.3f;
p_env_decay=0.4f;
p_env_punch=0.0f;
filter_on=false;
p_lpf_resonance=0.0f;
p_lpf_freq=1.0f;
p_lpf_ramp=0.0f;
p_hpf_freq=0.0f;
p_hpf_ramp=0.0f;
p_pha_offset=0.0f;
p_pha_ramp=0.0f;
p_repeat_speed=0.0f;
p_arp_speed=0.0f;
p_arp_mod=0.0f;
}
bool LoadSettings(const char* filename)
{
FILE* file=fopen(filename, "rb");
if(!file)
return false;
int version=0;
fread(&version, 1, sizeof(int), file);
if(version!=100 && version!=101 && version!=102)
return false;
fread(&wave_type, 1, sizeof(int), file);
sound_vol=0.5f;
if(version==102)
fread(&sound_vol, 1, sizeof(float), file);
fread(&p_base_freq, 1, sizeof(float), file);
fread(&p_freq_limit, 1, sizeof(float), file);
fread(&p_freq_ramp, 1, sizeof(float), file);
if(version>=101)
fread(&p_freq_dramp, 1, sizeof(float), file);
fread(&p_duty, 1, sizeof(float), file);
fread(&p_duty_ramp, 1, sizeof(float), file);
fread(&p_vib_strength, 1, sizeof(float), file);
fread(&p_vib_speed, 1, sizeof(float), file);
fread(&p_vib_delay, 1, sizeof(float), file);
fread(&p_env_attack, 1, sizeof(float), file);
fread(&p_env_sustain, 1, sizeof(float), file);
fread(&p_env_decay, 1, sizeof(float), file);
fread(&p_env_punch, 1, sizeof(float), file);
fread(&filter_on, 1, sizeof(bool), file);
fread(&p_lpf_resonance, 1, sizeof(float), file);
fread(&p_lpf_freq, 1, sizeof(float), file);
fread(&p_lpf_ramp, 1, sizeof(float), file);
fread(&p_hpf_freq, 1, sizeof(float), file);
fread(&p_hpf_ramp, 1, sizeof(float), file);
fread(&p_pha_offset, 1, sizeof(float), file);
fread(&p_pha_ramp, 1, sizeof(float), file);
fread(&p_repeat_speed, 1, sizeof(float), file);
if(version>=101)
{
fread(&p_arp_speed, 1, sizeof(float), file);
fread(&p_arp_mod, 1, sizeof(float), file);
}
fclose(file);
return true;
}
bool SaveSettings(const char* filename)
{
FILE* file=fopen(filename, "wb");
if(!file)
return false;
int version=102;
fwrite(&version, 1, sizeof(int), file);
fwrite(&wave_type, 1, sizeof(int), file);
fwrite(&sound_vol, 1, sizeof(float), file);
fwrite(&p_base_freq, 1, sizeof(float), file);
fwrite(&p_freq_limit, 1, sizeof(float), file);
fwrite(&p_freq_ramp, 1, sizeof(float), file);
fwrite(&p_freq_dramp, 1, sizeof(float), file);
fwrite(&p_duty, 1, sizeof(float), file);
fwrite(&p_duty_ramp, 1, sizeof(float), file);
fwrite(&p_vib_strength, 1, sizeof(float), file);
fwrite(&p_vib_speed, 1, sizeof(float), file);
fwrite(&p_vib_delay, 1, sizeof(float), file);
fwrite(&p_env_attack, 1, sizeof(float), file);
fwrite(&p_env_sustain, 1, sizeof(float), file);
fwrite(&p_env_decay, 1, sizeof(float), file);
fwrite(&p_env_punch, 1, sizeof(float), file);
fwrite(&filter_on, 1, sizeof(bool), file);
fwrite(&p_lpf_resonance, 1, sizeof(float), file);
fwrite(&p_lpf_freq, 1, sizeof(float), file);
fwrite(&p_lpf_ramp, 1, sizeof(float), file);
fwrite(&p_hpf_freq, 1, sizeof(float), file);
fwrite(&p_hpf_ramp, 1, sizeof(float), file);
fwrite(&p_pha_offset, 1, sizeof(float), file);
fwrite(&p_pha_ramp, 1, sizeof(float), file);
fwrite(&p_repeat_speed, 1, sizeof(float), file);
fwrite(&p_arp_speed, 1, sizeof(float), file);
fwrite(&p_arp_mod, 1, sizeof(float), file);
fclose(file);
return true;
}
void ResetSample(bool restart)
{
if(!restart)
phase=0;
fperiod=100.0/(p_base_freq*p_base_freq+0.001);
period=(int)fperiod;
fmaxperiod=100.0/(p_freq_limit*p_freq_limit+0.001);
fslide=1.0-pow((double)p_freq_ramp, 3.0)*0.01;
fdslide=-pow((double)p_freq_dramp, 3.0)*0.000001;
square_duty=0.5f-p_duty*0.5f;
square_slide=-p_duty_ramp*0.00005f;
if(p_arp_mod>=0.0f)
arp_mod=1.0-pow((double)p_arp_mod, 2.0)*0.9;
else
arp_mod=1.0+pow((double)p_arp_mod, 2.0)*10.0;
arp_time=0;
arp_limit=(int)(pow(1.0f-p_arp_speed, 2.0f)*20000+32);
if(p_arp_speed==1.0f)
arp_limit=0;
if(!restart)
{
// reset filter
fltp=0.0f;
fltdp=0.0f;
fltw=pow(p_lpf_freq, 3.0f)*0.1f;
fltw_d=1.0f+p_lpf_ramp*0.0001f;
fltdmp=5.0f/(1.0f+pow(p_lpf_resonance, 2.0f)*20.0f)*(0.01f+fltw);
if(fltdmp>0.8f) fltdmp=0.8f;
fltphp=0.0f;
flthp=pow(p_hpf_freq, 2.0f)*0.1f;
flthp_d=1.0+p_hpf_ramp*0.0003f;
// reset vibrato
vib_phase=0.0f;
vib_speed=pow(p_vib_speed, 2.0f)*0.01f;
vib_amp=p_vib_strength*0.5f;
// reset envelope
env_vol=0.0f;
env_stage=0;
env_time=0;
env_length[0]=(int)(p_env_attack*p_env_attack*100000.0f);
env_length[1]=(int)(p_env_sustain*p_env_sustain*100000.0f);
env_length[2]=(int)(p_env_decay*p_env_decay*100000.0f);
fphase=pow(p_pha_offset, 2.0f)*1020.0f;
if(p_pha_offset<0.0f) fphase=-fphase;
fdphase=pow(p_pha_ramp, 2.0f)*1.0f;
if(p_pha_ramp<0.0f) fdphase=-fdphase;
iphase=abs((int)fphase);
ipp=0;
for(int i=0;i<1024;i++)
phaser_buffer[i]=0.0f;
for(int i=0;i<32;i++)
noise_buffer[i]=frnd(2.0f)-1.0f;
rep_time=0;
rep_limit=(int)(pow(1.0f-p_repeat_speed, 2.0f)*20000+32);
if(p_repeat_speed==0.0f)
rep_limit=0;
}
}
void SynthSample(int length, float* buffer, FILE* file)
{
for(int i=0;i<length;i++)
{
if(!playing_sample)
break;
rep_time++;
if(rep_limit!=0 && rep_time>=rep_limit)
{
rep_time=0;
ResetSample(true);
}
// frequency envelopes/arpeggios
arp_time++;
if(arp_limit!=0 && arp_time>=arp_limit)
{
arp_limit=0;
fperiod*=arp_mod;
}
fslide+=fdslide;
fperiod*=fslide;
if(fperiod>fmaxperiod)
{
fperiod=fmaxperiod;
if(p_freq_limit>0.0f)
playing_sample=false;
}
float rfperiod=fperiod;
if(vib_amp>0.0f)
{
vib_phase+=vib_speed;
rfperiod=fperiod*(1.0+sin(vib_phase)*vib_amp);
}
period=(int)rfperiod;
if(period<8) period=8;
square_duty+=square_slide;
if(square_duty<0.0f) square_duty=0.0f;
if(square_duty>0.5f) square_duty=0.5f;
// volume envelope
env_time++;
if(env_time>env_length[env_stage])
{
env_time=0;
env_stage++;
if(env_stage==3)
playing_sample=false;
}
if(env_stage==0)
env_vol=(float)env_time/env_length[0];
if(env_stage==1)
env_vol=1.0f+pow(1.0f-(float)env_time/env_length[1], 1.0f)*2.0f*p_env_punch;
if(env_stage==2)
env_vol=1.0f-(float)env_time/env_length[2];
// phaser step
fphase+=fdphase;
iphase=abs((int)fphase);
if(iphase>1023) iphase=1023;
if(flthp_d!=0.0f)
{
flthp*=flthp_d;
if(flthp<0.00001f) flthp=0.00001f;
if(flthp>0.1f) flthp=0.1f;
}
float ssample=0.0f;
for(int si=0;si<8;si++) // 8x supersampling
{
float sample=0.0f;
phase++;
if(phase>=period)
{
// phase=0;
phase%=period;
if(wave_type==3)
for(int i=0;i<32;i++)
noise_buffer[i]=frnd(2.0f)-1.0f;
}
// base waveform
float fp=(float)phase/period;
switch(wave_type)
{
case 0: // square
if(fp<square_duty)
sample=0.5f;
else
sample=-0.5f;
break;
case 1: // sawtooth
sample=1.0f-fp*2;
break;
case 2: // sine
sample=(float)sin(fp*2*PI);
break;
case 3: // noise
sample=noise_buffer[phase*32/period];
break;
}
// lp filter
float pp=fltp;
fltw*=fltw_d;
if(fltw<0.0f) fltw=0.0f;
if(fltw>0.1f) fltw=0.1f;
if(p_lpf_freq!=1.0f)
{
fltdp+=(sample-fltp)*fltw;
fltdp-=fltdp*fltdmp;
}
else
{
fltp=sample;
fltdp=0.0f;
}
fltp+=fltdp;
// hp filter
fltphp+=fltp-pp;
fltphp-=fltphp*flthp;
sample=fltphp;
// phaser
phaser_buffer[ipp&1023]=sample;
sample+=phaser_buffer[(ipp-iphase+1024)&1023];
ipp=(ipp+1)&1023;
// final accumulation and envelope application
ssample+=sample*env_vol;
}
ssample=ssample/8*master_vol;
ssample*=2.0f*sound_vol;
if(buffer!=NULL)
{
if(ssample>1.0f) ssample=1.0f;
if(ssample<-1.0f) ssample=-1.0f;
*buffer++=ssample;
}
if(file!=NULL)
{
// quantize depending on format
// accumulate/count to accomodate variable sample rate?
ssample*=4.0f; // arbitrary gain to get reasonable output volume...
if(ssample>1.0f) ssample=1.0f;
if(ssample<-1.0f) ssample=-1.0f;
filesample+=ssample;
fileacc++;
if(wav_freq==44100 || fileacc==2)
{
filesample/=fileacc;
fileacc=0;
if(wav_bits==16)
{
short isample=(short)(filesample*32000);
fwrite(&isample, 1, 2, file);
}
else
{
unsigned char isample=(unsigned char)(filesample*127+128);
fwrite(&isample, 1, 1, file);
}
filesample=0.0f;
}
file_sampleswritten++;
}
}
}
void PlaySample()
{
ResetSample(false);
playing_sample=true;
}
bool ExportWAV(char* filename)
{
FILE* foutput=fopen(filename, "wb");
if(!foutput)
return false;
// write wav header
char string[32];
unsigned int dword=0;
unsigned short word=0;
fwrite("RIFF", 4, 1, foutput); // "RIFF"
dword=0;
fwrite(&dword, 1, 4, foutput); // remaining file size
fwrite("WAVE", 4, 1, foutput); // "WAVE"
fwrite("fmt ", 4, 1, foutput); // "fmt "
dword=16;
fwrite(&dword, 1, 4, foutput); // chunk size
word=1;
fwrite(&word, 1, 2, foutput); // compression code
word=1;
fwrite(&word, 1, 2, foutput); // channels
dword=wav_freq;
fwrite(&dword, 1, 4, foutput); // sample rate
dword=wav_freq*wav_bits/8;
fwrite(&dword, 1, 4, foutput); // bytes/sec
word=wav_bits/8;
fwrite(&word, 1, 2, foutput); // block align
word=wav_bits;
fwrite(&word, 1, 2, foutput); // bits per sample
fwrite("data", 4, 1, foutput); // "data"
dword=0;
int foutstream_datasize=ftell(foutput);
fwrite(&dword, 1, 4, foutput); // chunk size
// write sample data
file_sampleswritten=0;
filesample=0.0f;
fileacc=0;
PlaySample();
while(playing_sample)
SynthSample(256, NULL, foutput);
// seek back to header and write size info
fseek(foutput, 4, SEEK_SET);
dword=0;
dword=foutstream_datasize-4+file_sampleswritten*wav_bits/8;
fwrite(&dword, 1, 4, foutput); // remaining file size
fseek(foutput, foutstream_datasize, SEEK_SET);
dword=file_sampleswritten*wav_bits/8;
fwrite(&dword, 1, 4, foutput); // chunk size (data)
fclose(foutput);
return true;
}
bool loadPreset(int aPresetNo, int aRandSeed)
{
if (aPresetNo < 0 || aPresetNo > 6)
return false; //INVALID_PARAMETER;
ResetParams();
srand(aRandSeed);
switch(aPresetNo)
{
case 0: // pickup/coin
p_base_freq=0.4f+frnd(0.5f);
p_env_attack=0.0f;
p_env_sustain=frnd(0.1f);
p_env_decay=0.1f+frnd(0.4f);
p_env_punch=0.3f+frnd(0.3f);
if(rnd(1))
{
p_arp_speed=0.5f+frnd(0.2f);
p_arp_mod=0.2f+frnd(0.4f);
}
break;
case 1: // laser/shoot
wave_type=rnd(2);
if(wave_type==2 && rnd(1))
wave_type=rnd(1);
p_base_freq=0.5f+frnd(0.5f);
p_freq_limit=p_base_freq-0.2f-frnd(0.6f);
if(p_freq_limit<0.2f) p_freq_limit=0.2f;
p_freq_ramp=-0.15f-frnd(0.2f);
if(rnd(2)==0)
{
p_base_freq=0.3f+frnd(0.6f);
p_freq_limit=frnd(0.1f);
p_freq_ramp=-0.35f-frnd(0.3f);
}
if(rnd(1))
{
p_duty=frnd(0.5f);
p_duty_ramp=frnd(0.2f);
}
else
{
p_duty=0.4f+frnd(0.5f);
p_duty_ramp=-frnd(0.7f);
}
p_env_attack=0.0f;
p_env_sustain=0.1f+frnd(0.2f);
p_env_decay=frnd(0.4f);
if(rnd(1))
p_env_punch=frnd(0.3f);
if(rnd(2)==0)
{
p_pha_offset=frnd(0.2f);
p_pha_ramp=-frnd(0.2f);
}
if(rnd(1))
p_hpf_freq=frnd(0.3f);
break;
case 2: // explosion
wave_type=3;
if(rnd(1))
{
p_base_freq=0.1f+frnd(0.4f);
p_freq_ramp=-0.1f+frnd(0.4f);
}
else
{
p_base_freq=0.2f+frnd(0.7f);
p_freq_ramp=-0.2f-frnd(0.2f);
}
p_base_freq*=p_base_freq;
if(rnd(4)==0)
p_freq_ramp=0.0f;
if(rnd(2)==0)
p_repeat_speed=0.3f+frnd(0.5f);
p_env_attack=0.0f;
p_env_sustain=0.1f+frnd(0.3f);
p_env_decay=frnd(0.5f);
if(rnd(1)==0)
{
p_pha_offset=-0.3f+frnd(0.9f);
p_pha_ramp=-frnd(0.3f);
}
p_env_punch=0.2f+frnd(0.6f);
if(rnd(1))
{
p_vib_strength=frnd(0.7f);
p_vib_speed=frnd(0.6f);
}
if(rnd(2)==0)
{
p_arp_speed=0.6f+frnd(0.3f);
p_arp_mod=0.8f-frnd(1.6f);
}
break;
case 3: // powerup
if(rnd(1))
wave_type=1;
else
p_duty=frnd(0.6f);
if(rnd(1))
{
p_base_freq=0.2f+frnd(0.3f);
p_freq_ramp=0.1f+frnd(0.4f);
p_repeat_speed=0.4f+frnd(0.4f);
}
else
{
p_base_freq=0.2f+frnd(0.3f);
p_freq_ramp=0.05f+frnd(0.2f);
if(rnd(1))
{
p_vib_strength=frnd(0.7f);
p_vib_speed=frnd(0.6f);
}
}
p_env_attack=0.0f;
p_env_sustain=frnd(0.4f);
p_env_decay=0.1f+frnd(0.4f);
break;
case 4: // hit/hurt
wave_type=rnd(2);
if(wave_type==2)
wave_type=3;
if(wave_type==0)
p_duty=frnd(0.6f);
p_base_freq=0.2f+frnd(0.6f);
p_freq_ramp=-0.3f-frnd(0.4f);
p_env_attack=0.0f;
p_env_sustain=frnd(0.1f);
p_env_decay=0.1f+frnd(0.2f);
if(rnd(1))
p_hpf_freq=frnd(0.3f);
break;
case 5: // jump
wave_type=0;
p_duty=frnd(0.6f);
p_base_freq=0.3f+frnd(0.3f);
p_freq_ramp=0.1f+frnd(0.2f);
p_env_attack=0.0f;
p_env_sustain=0.1f+frnd(0.3f);
p_env_decay=0.1f+frnd(0.2f);
if(rnd(1))
p_hpf_freq=frnd(0.3f);
if(rnd(1))
p_lpf_freq=1.0f-frnd(0.6f);
break;
case 6: // blip/select
wave_type=rnd(1);
if(wave_type==0)
p_duty=frnd(0.6f);
p_base_freq=0.2f+frnd(0.4f);
p_env_attack=0.0f;
p_env_sustain=0.1f+frnd(0.1f);
p_env_decay=frnd(0.2f);
p_hpf_freq=0.1f;
break;
}
return true;
}
int main(int argc, char **argv) {
if( argc != 3 ) exit( -printf("%s input.sfxr output.wav\n", argv[0]) );
if( argc > 1 && LoadSettings(argv[1]) ) {
if( argc > 2 && ExportWAV(argv[2]) ) {
return 0;
} else {
fprintf(stderr, "Cannot open file %s for writing\n", argv[2]);
}
} else {
fprintf(stderr, "Cannot open file %s for reading\n", argv[1]);
}
return -1;
}