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This commit is contained in:
Michael Sippel 2025-02-17 18:06:56 +01:00
parent 62acece204
commit a6970aeed3
Signed by: senvas
GPG key ID: 060F22F65102F95C
7 changed files with 315 additions and 342 deletions
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47
delay.c
View file

@ -1,12 +1,12 @@
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "delay.h" #include "delay.h"
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
void delay_init( void delay_init(
struct delay * delay struct delay* delay)
) { {
delay->mix = 0.8; delay->mix = 0.8;
delay->feedback = 0.8; delay->feedback = 0.8;
delay->duration = 0; delay->duration = 0;
@ -16,39 +16,38 @@ void delay_init(
} }
void delay_set_time( void delay_set_time(
struct delay * delay, struct delay* delay,
uint64_t new_duration uint64_t new_duration)
) { {
printf("set delay duration to %lu samples\n", new_duration); printf("set delay duration to %lu samples\n", new_duration);
if( new_duration > delay->buf_capacity ) { if (new_duration > delay->buf_capacity) {
delay->buf_capacity = new_duration; delay->buf_capacity = new_duration;
delay->buf = realloc( delay->buf, sizeof(float) * new_duration ); delay->buf = realloc(delay->buf, sizeof(float) * new_duration);
} }
for( int i = delay->duration; i < new_duration; ++i ) { for (int i = delay->duration; i < new_duration; ++i) {
delay->buf[i] = delay->buf[i - delay->duration]; delay->buf[i] = delay->buf[i - delay->duration];
} }
delay->duration = new_duration; delay->duration = new_duration;
if( new_duration > 0 ) { if (new_duration > 0) {
delay->buf_idx %= new_duration; delay->buf_idx %= new_duration;
} }
} }
void delay_process( void delay_process(
struct delay * delay, struct delay* delay,
size_t frame_size, size_t frame_size,
float const * in, float const* in,
float * out float* out)
) { {
for( size_t i = 0; i < frame_size; ++i ) { for (size_t i = 0; i < frame_size; ++i) {
if( delay->duration > 0 ) { if (delay->duration > 0) {
out[i] = out[i] = in[i]
in[i] + delay->mix * delay->buf[delay->buf_idx];
+ delay->mix * delay->buf[ delay->buf_idx ];
delay->buf[ delay->buf_idx ] *= delay->feedback; delay->buf[delay->buf_idx] *= delay->feedback;
delay->buf[ delay->buf_idx ] += (1.0 - delay->feedback) * in[i]; delay->buf[delay->buf_idx] += (1.0 - delay->feedback) * in[i];
delay->buf_idx = (delay->buf_idx + 1) % delay->duration; delay->buf_idx = (delay->buf_idx + 1) % delay->duration;
} else { } else {
out[i] = 0.5 * in[i]; out[i] = 0.5 * in[i];

19
delay.h
View file

@ -1,7 +1,7 @@
#pragma once #pragma once
#include <stdint.h>
#include <stddef.h> #include <stddef.h>
#include <stdint.h>
struct delay { struct delay {
uint64_t duration; uint64_t duration;
@ -10,21 +10,18 @@ struct delay {
uint64_t buf_idx; uint64_t buf_idx;
size_t buf_capacity; size_t buf_capacity;
float * buf; float* buf;
}; };
void delay_init( void delay_init(
struct delay * delay struct delay* delay);
);
void delay_set_time( void delay_set_time(
struct delay * delay, struct delay* delay,
uint64_t new_duration uint64_t new_duration);
);
void delay_process( void delay_process(
struct delay * delay, struct delay* delay,
size_t frame_size, size_t frame_size,
float const * in, float const* in,
float * out float* out);
);

62
gate.c
View file

@ -1,13 +1,13 @@
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "gate.h" #include "gate.h"
#include <math.h> #include <math.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
void gate_init( void gate_init(
struct gate * gate struct gate* gate)
) { {
gate->threshold = 0.0; gate->threshold = 0.0;
gate->enable_calibration = false; gate->enable_calibration = false;
@ -22,42 +22,42 @@ void gate_init(
} }
void gate_process( void gate_process(
struct gate * gate, struct gate* gate,
size_t frame_size, size_t frame_size,
float const * in, float const* in,
float * out float* out)
) { {
bool act = false; bool act = false;
for( size_t i = 0; i < frame_size; ++i ) { for (size_t i = 0; i < frame_size; ++i) {
gate->cur_block_sum += fabs( in[i] ); gate->cur_block_sum += fabs(in[i]);
gate->cur_block_count += 1; gate->cur_block_count += 1;
if( gate->cur_block_count >= gate->block_size ) { if (gate->cur_block_count >= gate->block_size) {
//printf("new block sum %f, gain = %f\n", gate->cur_block_sum, gate->cur_gain); // printf("new block sum %f, gain = %f\n", gate->cur_block_sum, gate->cur_gain);
gate->last_block_sum = gate->cur_block_sum; gate->last_block_sum = gate->cur_block_sum;
gate->cur_block_sum = 0.0; gate->cur_block_sum = 0.0;
if( gate->last_block_sum > 0.03 ) { if (gate->last_block_sum > 0.03) {
act = true; act = true;
} else { } else {
act = false; act = false;
} }
} }
if( act ) { if (act) {
gate->cur_gain += gate->attack; gate->cur_gain += gate->attack;
if( gate->cur_gain > 1.0 ) { if (gate->cur_gain > 1.0) {
gate->cur_gain = 1.0; gate->cur_gain = 1.0;
} }
} else { } else {
gate->cur_gain -= gate->release; gate->cur_gain -= gate->release;
if( gate->cur_gain < 0.0 ) { if (gate->cur_gain < 0.0) {
gate->cur_gain = 0.0; gate->cur_gain = 0.0;
} }
} }
out[i] = in[i] * gate->cur_gain; out[i] = in[i] * gate->cur_gain;
} }

33
gate.h
View file

@ -1,29 +1,28 @@
#pragma once #pragma once
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h> #include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
struct gate { struct gate {
float threshold; float threshold;
bool enable_calibration; bool enable_calibration;
unsigned block_size; unsigned block_size;
unsigned cur_block_count; unsigned cur_block_count;
float cur_block_sum; float cur_block_sum;
float last_block_sum; float last_block_sum;
bool is_active; bool is_active;
float cur_gain; float cur_gain;
float attack; float attack;
float release; float release;
}; };
void gate_init(); void gate_init();
void gate_process( void gate_process(
struct gate * gate, struct gate* gate,
size_t frame_size, size_t frame_size,
float const * in, float const* in,
float * out float* out);
);

400
guitfx.c
View file

@ -2,283 +2,259 @@
#include "pipewire/port.h" #include "pipewire/port.h"
#include "spa/pod/iter.h" #include "spa/pod/iter.h"
#include "spa/utils/defs.h" #include "spa/utils/defs.h"
#include <stdio.h>
#include <signal.h> #include <signal.h>
#include <stdio.h>
#include <spa/pod/pod.h>
#include <spa/pod/builder.h>
#include <spa/control/control.h> #include <spa/control/control.h>
#include <spa/param/latency-utils.h> #include <spa/param/latency-utils.h>
#include <spa/pod/builder.h>
#include <spa/pod/pod.h>
#include <pipewire/pipewire.h>
#include <pipewire/filter.h> #include <pipewire/filter.h>
#include <pipewire/pipewire.h>
#include "delay.h" #include "delay.h"
#include "sust.h"
#include "gate.h" #include "gate.h"
#include "sust.h"
float envelope( float x ); float envelope(float x);
struct data; struct data;
struct port { struct port {
struct data *data; struct data* data;
}; };
struct data { struct data {
struct pw_main_loop * loop; struct pw_main_loop* loop;
struct pw_filter * filter; struct pw_filter* filter;
struct port * guit_in_port; struct port* guit_in_port;
struct port * midi_in_port; struct port* midi_in_port;
struct port * out_port; struct port* out_port;
//! effect data //! effect data
uint64_t last_tap; uint64_t last_tap;
struct delay delay; struct delay delay;
struct sust sust; struct sust sust;
struct gate gate; struct gate gate;
unsigned prog; unsigned prog;
//! elapsed time in number of samples //! elapsed time in number of samples
uint64_t time; uint64_t time;
}; };
static void on_process(void *userdata, struct spa_io_position *position) static void on_process(void* userdata, struct spa_io_position* position)
{ {
struct data *data = userdata; struct data* data = userdata;
uint32_t n_samples = position->clock.duration; uint32_t n_samples = position->clock.duration;
uint64_t frame = data->time; uint64_t frame = data->time;
data->time += n_samples; data->time += n_samples;
struct pw_buffer * b = pw_filter_dequeue_buffer(data->midi_in_port); struct pw_buffer* b = pw_filter_dequeue_buffer(data->midi_in_port);
if( b == NULL ) { if (b == NULL) {
fprintf(stderr, "on_process(): no buffer for midi_in_port\n"); fprintf(stderr, "on_process(): no buffer for midi_in_port\n");
return; return;
} }
struct spa_buffer * buf = b->buffer; struct spa_buffer* buf = b->buffer;
spa_assert(buf->n_datas == 1); spa_assert(buf->n_datas == 1);
struct spa_data * d = &buf->datas[0]; struct spa_data* d = &buf->datas[0];
if( d->data ) { if (d->data) {
struct spa_pod * pod = struct spa_pod* pod = spa_pod_from_data(d->data, d->maxsize,
spa_pod_from_data( d->chunk->offset, d->chunk->size);
d->data,
d->maxsize,
d->chunk->offset,
d->chunk->size
);
if( pod ) { if (pod) {
if( spa_pod_is_sequence(pod) ) { if (spa_pod_is_sequence(pod)) {
struct spa_pod_sequence * pod_seq = (struct spa_pod_sequence*) pod; struct spa_pod_sequence* pod_seq = (struct spa_pod_sequence*)pod;
struct spa_pod_control * c; struct spa_pod_control* c;
SPA_POD_SEQUENCE_FOREACH(pod_seq, c) { SPA_POD_SEQUENCE_FOREACH(pod_seq, c)
if( c->type == SPA_CONTROL_Midi ) { {
unsigned sec = if (c->type == SPA_CONTROL_Midi) {
(frame + c->offset) unsigned sec = (frame + c->offset) / (float)position->clock.rate.denom;
/ (float) position->clock.rate.denom; char* midi_data = SPA_POD_BODY(&c->value);
char * midi_data = SPA_POD_BODY(&c->value); unsigned size = SPA_POD_BODY_SIZE(&c->value);
unsigned size = SPA_POD_BODY_SIZE(&c->value);
printf("[%d] MIDI message (%d bytes) : %x, %x, %x\n", sec, size, midi_data[0], midi_data[1], midi_data[2]); printf("[%d] MIDI message (%d bytes) : %x, %x, %x\n", sec, size,
midi_data[0], midi_data[1], midi_data[2]);
switch( midi_data[0] & 0xff ) { switch (midi_data[0] & 0xff) {
case 0xb0: case 0xb0:
switch( midi_data[1] ) { switch (midi_data[1]) {
case 0x0b: case 0x0b:
// expr pedal // expr pedal
float val_f = ((float)midi_data[2]) / 128.0; float val_f = ((float)midi_data[2]) / 128.0;
float thres = 0.5; float thres = 0.5;
if ( val_f > thres ) { if (val_f > thres) {
float expr_mix = (val_f - thres) / (1.0-thres); float expr_mix = (val_f - thres) / (1.0 - thres);
printf("Expr Pedal %f\n", expr_mix); printf("Expr Pedal %f\n", expr_mix);
data->delay.mix = expr_mix; data->delay.mix = expr_mix;
} else { } else {
data->delay.mix = 0.0; data->delay.mix = 0.0;
} }
break; break;
case 0x42: case 0x42:
// noise gate calibration // noise gate calibration
if( data->prog == 2 ) { if (data->prog == 2) {
if( midi_data[2] >= 64) { if (midi_data[2] >= 64) {
data->gate.threshold = data->gate.cur_block_sum * 0.8; data->gate.threshold = data->gate.cur_block_sum * 0.8;
printf("calibrate noise gate: threshold = %f\n", data->gate.threshold); printf("calibrate noise gate: threshold = %f\n",
} data->gate.threshold);
} }
}
// sust pedal // sust pedal
if( data->prog == 1 ) { if (data->prog == 1) {
if( midi_data[2] >= 64) { if (midi_data[2] >= 64) {
sust_swap( &data->sust ); sust_swap(&data->sust);
data->sust.playing = true; data->sust.playing = true;
data->sust.start_idx = data->sust.idx; data->sust.start_idx = data->sust.idx;
data->sust.idx = 0; data->sust.idx = 0;
} else { } else {
data->sust.playing = false; data->sust.playing = false;
} }
} }
// tap tempo // tap tempo
if( data->prog == 0 ) { if (data->prog == 0) {
uint64_t cur_tap = frame + c->offset; uint64_t cur_tap = frame + c->offset;
uint64_t duration = cur_tap - data->last_tap; uint64_t duration = cur_tap - data->last_tap;
data->last_tap = cur_tap; data->last_tap = cur_tap;
if( duration < (4*position->clock.rate.denom) ) { if (duration < (4 * position->clock.rate.denom)) {
delay_set_time( &data->delay, duration ); delay_set_time(&data->delay, duration);
} }
sust_resize(&data->sust, duration);
}
sust_resize( &data->sust, duration ); break;
} }
break; break;
}
break; case 0xc0:
// program change
if (midi_data[2] >= 64) {
sust_swap(&data->sust);
data->sust.playing = true;
case 0xc0: data->sust.start_idx = data->sust.idx;
// program change data->sust.idx = 0;
if( midi_data[2] >= 64) { } else {
sust_swap( &data->sust ); data->sust.playing = false;
data->sust.playing = true; }
printf("program change: %u\n", midi_data[1]);
data->prog = midi_data[1];
break;
}
} else {
printf("on_process(): non midi-control\n");
}
}
} else {
fprintf(stderr, "on_process(): unexpected POD that is not a sequence "
"(midi_in_port)\n");
}
} else {
fprintf(stderr, "on_process(): pod is NULL\n");
}
} else {
fprintf(stderr, "on_process(): no data in buffer of midi_in_port\n");
}
data->sust.start_idx = data->sust.idx; pw_filter_queue_buffer(data->midi_in_port, b);
data->sust.idx = 0;
} else {
data->sust.playing = false;
}
printf("program change: %u\n", midi_data[1]);
data->prog = midi_data[1];
break;
}
} else {
printf("on_process(): non midi-control\n");
}
}
} else {
fprintf(stderr, "on_process(): unexpected POD that is not a sequence (midi_in_port)\n");
}
} else {
fprintf(stderr, "on_process(): pod is NULL\n");
}
} else {
fprintf(stderr, "on_process(): no data in buffer of midi_in_port\n");
}
pw_filter_queue_buffer(data->midi_in_port, b); float* const in = pw_filter_get_dsp_buffer(data->guit_in_port, n_samples);
float tmp1[n_samples];
float tmp2[n_samples];
float * const in = pw_filter_get_dsp_buffer(data->guit_in_port, n_samples); float* out = pw_filter_get_dsp_buffer(data->out_port, n_samples);
float tmp1[n_samples]; if (in && out) {
float tmp2[n_samples]; gate_process(&data->gate, n_samples, in, tmp1);
float * out = pw_filter_get_dsp_buffer(data->out_port, n_samples); sust_process(&data->sust, n_samples, tmp1, tmp2);
if( in && out ) { delay_process(&data->delay, n_samples, tmp2, out);
gate_process( &data->gate, n_samples, in, tmp1 ); }
sust_process( &data->sust, n_samples, tmp1, tmp2 );
delay_process( &data->delay, n_samples, tmp2, out );
}
} }
static const struct pw_filter_events filter_events = { static const struct pw_filter_events filter_events = {
PW_VERSION_FILTER_EVENTS, PW_VERSION_FILTER_EVENTS,
.process = on_process, .process = on_process,
}; };
static void do_quit(void *userdata, int signal_number) static void do_quit(void* userdata, int signal_number)
{ {
struct data *data = userdata; struct data* data = userdata;
pw_main_loop_quit(data->loop); pw_main_loop_quit(data->loop);
} }
int main(int argc, char *argv[]) int main(int argc, char* argv[])
{ {
struct data data = { 0, }; struct data data = {
0,
};
gate_init( &data.gate ); gate_init(&data.gate);
delay_init( &data.delay ); delay_init(&data.delay);
sust_init( &data.sust ); sust_init(&data.sust);
data.prog = 0; data.prog = 0;
const struct spa_pod *params[1]; const struct spa_pod* params[1];
uint8_t buffer[1024]; uint8_t buffer[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer)); struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
pw_init(&argc, &argv); pw_init(&argc, &argv);
data.loop = pw_main_loop_new(NULL); data.loop = pw_main_loop_new(NULL);
pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGINT, do_quit, &data); pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGINT, do_quit, &data);
pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGTERM, do_quit, &data); pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGTERM, do_quit, &data);
data.filter = pw_filter_new_simple( data.filter = pw_filter_new_simple(
pw_main_loop_get_loop(data.loop), pw_main_loop_get_loop(data.loop), "Guitar FX",
"Guitar FX", pw_properties_new(PW_KEY_MEDIA_TYPE, "Audio", PW_KEY_MEDIA_CATEGORY,
pw_properties_new( "Filter", PW_KEY_MEDIA_ROLE, "DSP", NULL),
PW_KEY_MEDIA_TYPE, "Audio", &filter_events, &data);
PW_KEY_MEDIA_CATEGORY, "Filter",
PW_KEY_MEDIA_ROLE, "DSP",
NULL),
&filter_events,
&data);
data.midi_in_port = pw_filter_add_port(data.filter, data.midi_in_port = pw_filter_add_port(data.filter, PW_DIRECTION_INPUT,
PW_DIRECTION_INPUT, PW_FILTER_PORT_FLAG_MAP_BUFFERS, sizeof(struct port),
PW_FILTER_PORT_FLAG_MAP_BUFFERS, pw_properties_new(PW_KEY_FORMAT_DSP, "8 bit raw midi",
sizeof(struct port), PW_KEY_PORT_NAME, "midi in", NULL),
pw_properties_new( NULL, 0);
PW_KEY_FORMAT_DSP, "8 bit raw midi",
PW_KEY_PORT_NAME, "midi in",
NULL
),
NULL, 0
);
data.guit_in_port = pw_filter_add_port(data.filter, data.guit_in_port = pw_filter_add_port(
PW_DIRECTION_INPUT, data.filter, PW_DIRECTION_INPUT, PW_FILTER_PORT_FLAG_MAP_BUFFERS,
PW_FILTER_PORT_FLAG_MAP_BUFFERS, sizeof(struct port),
sizeof(struct port), pw_properties_new(PW_KEY_FORMAT_DSP, "32 bit float mono audio",
pw_properties_new( PW_KEY_PORT_NAME, "guitar in", NULL),
PW_KEY_FORMAT_DSP, "32 bit float mono audio", NULL, 0);
PW_KEY_PORT_NAME, "guitar in",
NULL),
NULL, 0);
data.out_port = pw_filter_add_port(data.filter, data.out_port = pw_filter_add_port(
PW_DIRECTION_OUTPUT, data.filter, PW_DIRECTION_OUTPUT, PW_FILTER_PORT_FLAG_MAP_BUFFERS,
PW_FILTER_PORT_FLAG_MAP_BUFFERS, sizeof(struct port),
sizeof(struct port), pw_properties_new(PW_KEY_FORMAT_DSP, "32 bit float mono audio",
pw_properties_new( PW_KEY_PORT_NAME, "fx out", NULL),
PW_KEY_FORMAT_DSP, "32 bit float mono audio", NULL, 0);
PW_KEY_PORT_NAME, "fx out",
NULL),
NULL, 0);
params[0] = spa_process_latency_build(&b, params[0] = spa_process_latency_build(
SPA_PARAM_ProcessLatency, &b, SPA_PARAM_ProcessLatency,
&SPA_PROCESS_LATENCY_INFO_INIT( &SPA_PROCESS_LATENCY_INFO_INIT(.ns = 10 * SPA_NSEC_PER_MSEC));
.ns = 10 * SPA_NSEC_PER_MSEC
));
if (pw_filter_connect(data.filter, if (pw_filter_connect(data.filter, PW_FILTER_FLAG_RT_PROCESS, params, 1) < 0) {
PW_FILTER_FLAG_RT_PROCESS, fprintf(stderr, "can't connect\n");
params, 1) < 0) { return -1;
fprintf(stderr, "can't connect\n"); }
return -1;
}
pw_main_loop_run(data.loop); pw_main_loop_run(data.loop);
pw_filter_destroy(data.filter); pw_filter_destroy(data.filter);
pw_main_loop_destroy(data.loop); pw_main_loop_destroy(data.loop);
pw_deinit(); pw_deinit();
return 0; return 0;
} }

78
sust.c
View file

@ -1,9 +1,10 @@
#include "sust.h" #include "sust.h"
#include <math.h> #include <math.h>
#include <stdlib.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
void sust_init( struct sust * sust ) { void sust_init(struct sust* sust)
{
sust->mode = MODE_Sostenuto; sust->mode = MODE_Sostenuto;
sust->playing = false; sust->playing = false;
@ -12,73 +13,76 @@ void sust_init( struct sust * sust ) {
sust->idx = 0; sust->idx = 0;
sust->buf_len = 51200; sust->buf_len = 51200;
sust->record_buf = malloc( sizeof(float) * sust->buf_len ); sust->record_buf = malloc(sizeof(float) * sust->buf_len);
sust->play_buf = malloc( sizeof(float) * sust->buf_len ); sust->play_buf = malloc(sizeof(float) * sust->buf_len);
} }
float envelope( float x ) { float envelope(float x)
if( x < 0.4 ) {
if (x < 0.4)
return (x / 0.4) * (x / 0.4); return (x / 0.4) * (x / 0.4);
if( x < 0.6 ) if (x < 0.6)
return 1.0; return 1.0;
float v = 1.0 - ((x - 0.6) / 0.4); float v = 1.0 - ((x - 0.6) / 0.4);
return v*v; return v * v;
} }
float softcos( float x ) { float softcos(float x)
return sin( x * (3.141 / 2.0) ); {
return sin(x * (3.141 / 2.0));
} }
void sust_resize( struct sust * sust, size_t new_len ) { void sust_resize(struct sust* sust, size_t new_len)
sust->buf_len = new_len; {
sust->play_buf = realloc( sust->play_buf, sizeof(float) * new_len ); sust->buf_len = new_len;
sust->record_buf = realloc( sust->record_buf, sizeof(float) * new_len ); sust->play_buf = realloc(sust->play_buf, sizeof(float) * new_len);
sust->idx %= new_len; sust->record_buf = realloc(sust->record_buf, sizeof(float) * new_len);
sust->idx %= new_len;
} }
void sust_swap( void sust_swap(
struct sust * sust struct sust* sust)
) { {
float * tmp = sust->play_buf; float* tmp = sust->play_buf;
sust->play_buf = sust->record_buf; sust->play_buf = sust->record_buf;
sust->record_buf = tmp; sust->record_buf = tmp;
for( int i = 0; i < sust->buf_len; ++i ) { for (int i = 0; i < sust->buf_len; ++i) {
sust->record_buf[i] = sust->play_buf[i]; sust->record_buf[i] = sust->play_buf[i];
} }
} }
void sust_process( void sust_process(
struct sust * sust, struct sust* sust,
size_t frame_size, size_t frame_size,
float const * in, float const* in,
float * out float* out)
) { {
for( size_t i = 0; i < frame_size; ++i ) { for (size_t i = 0; i < frame_size; ++i) {
if( sust->mode == MODE_Sustain && sust->idx == 0 ) { if (sust->mode == MODE_Sustain && sust->idx == 0) {
sust_swap( sust ); sust_swap(sust);
} }
float out_value = in[i]; float out_value = in[i];
if( sust->playing ) { if (sust->playing) {
int n_voices = 5; int n_voices = 5;
for( int v = 0; v < n_voices; ++v ) { for (int v = 0; v < n_voices; ++v) {
size_t play_idx = (sust->start_idx + sust->idx + ((v*sust->buf_len)/n_voices)) % sust->buf_len; size_t play_idx = (sust->start_idx + sust->idx + ((v * sust->buf_len) / n_voices)) % sust->buf_len;
float gain = envelope( ((float) play_idx) / ((float)sust->buf_len) ); float gain = envelope(((float)play_idx) / ((float)sust->buf_len));
//printf("gain = %f\n", gain); // printf("gain = %f\n", gain);
out_value += 0.5 *gain * sust->play_buf[ play_idx ]; out_value += 0.5 * gain * sust->play_buf[play_idx];
} }
} }
if( sust->mode == MODE_Sostenuto ) { if (sust->mode == MODE_Sostenuto) {
sust->record_buf[ sust->idx ] = in[i]; sust->record_buf[sust->idx] = in[i];
} }
if( sust->mode == MODE_Sustain ) { if (sust->mode == MODE_Sustain) {
sust->record_buf[ sust->idx ] = 0.5*out_value; sust->record_buf[sust->idx] = 0.5 * out_value;
} }
sust->idx = (sust->idx + 1) % sust->buf_len; sust->idx = (sust->idx + 1) % sust->buf_len;

18
sust.h
View file

@ -15,18 +15,16 @@ struct sust {
size_t start_idx; size_t start_idx;
size_t idx; size_t idx;
size_t buf_len; size_t buf_len;
float * record_buf; float* record_buf;
float * play_buf; float* play_buf;
}; };
void sust_init(struct sust* sust);
void sust_init( struct sust * sust ); void sust_resize(struct sust* sust, size_t new_len);
void sust_resize( struct sust * sust, size_t new_len ); void sust_swap(struct sust* sust);
void sust_swap( struct sust * sust );
void sust_process( void sust_process(
struct sust * sust, struct sust* sust,
size_t frame_size, size_t frame_size,
float const * in, float const* in,
float * out float* out);
);