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crossfade buffer for removing clicks on note changes

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veclav talica
2024-06-14 13:18:00 +05:00
parent b35498e230
commit ce5cfdd95b
4 changed files with 58 additions and 21 deletions
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64
Source/Maker/main.c
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@ -1,5 +1,6 @@
#include <stdio.h>
#include <string.h>
#define SOKOL_IMPL
#define SOKOL_GLCORE
@ -9,6 +10,7 @@
#include "../config.h"
#include "../envelope.c"
// #include "../interp.c"
#include "../oscillators.c"
#include "../phaser.c"
@ -20,17 +22,45 @@ static struct stfu_envelope envelope;
static float key_frequency = STFU_C4_FREQUENCY;
#define CROSSFADE_RING_RANGE \
(STFU_CROSSFADE_BUFFER_FRAMES * STFU_AUDIO_CHANNEL_COUNT)
static float crossfade_ring[CROSSFADE_RING_RANGE] = {0};
static size_t crossfade_ring_needle = 0;
static unsigned int crossfade_frames_left = 0;
static void sample(float buffer[static 2]) {
phaser0 = stfu_pump_phaser(phaser0);
phaser1 = stfu_pump_phaser(phaser1);
phaser2 = stfu_pump_phaser(phaser2);
envelope = stfu_pump_envelope(envelope);
float left = envelope.v * sinf(phaser2.v + sinf(phaser0.v + sinf(phaser1.v)));
float right =
envelope.v * sinf(phaser2.v + sinf(phaser0.v + sinf(phaser1.v)));
buffer[0] = left;
buffer[1] = right;
}
static void stream(float *buffer, int num_frames, int num_channels) {
for (int i = 0; i < num_frames; ++i) {
// sine0 = stfu_pump_sinewave(sine0); // Carrier
phaser0 = stfu_pump_phaser(phaser0);
phaser1 = stfu_pump_phaser(phaser1);
phaser2 = stfu_pump_phaser(phaser2);
envelope = stfu_pump_envelope(envelope);
buffer[2 * i + 0] =
envelope.v * sinf(phaser2.v + sinf(phaser0.v + sinf(phaser1.v)));
buffer[2 * i + 1] =
envelope.v * sinf(phaser2.v + sinf(phaser0.v + sinf(phaser1.v)));
/* Fade away */
for (size_t i = 0; crossfade_frames_left > 0;
crossfade_frames_left--, i += 2) {
crossfade_ring[(crossfade_ring_needle + i) % CROSSFADE_RING_RANGE] *=
(float)crossfade_frames_left / STFU_CROSSFADE_BUFFER_FRAMES;
crossfade_ring[(crossfade_ring_needle + i + 1) % CROSSFADE_RING_RANGE] *=
(float)crossfade_frames_left / STFU_CROSSFADE_BUFFER_FRAMES;
}
/* Drive the ring buffer */
// todo: Use memcpy for left and right side of the ring.
while (num_frames--) {
buffer[0] = crossfade_ring[crossfade_ring_needle % CROSSFADE_RING_RANGE];
buffer[1] =
crossfade_ring[(crossfade_ring_needle + 1) % CROSSFADE_RING_RANGE];
sample(&crossfade_ring[crossfade_ring_needle % CROSSFADE_RING_RANGE]);
buffer = &buffer[2];
crossfade_ring_needle += 2;
}
}
@ -46,9 +76,10 @@ static void init(void) {
phaser1 = stfu_init_phaser(key_frequency * 0.25);
phaser2 = stfu_init_phaser(key_frequency * 2.0);
envelope = stfu_init_envelope(
(struct stfu_envelope_point[]){
[0] = {.dur = 0.5, .vol = 0.33}, [1] = {.dur = 1.0, .vol = 0}},
2);
(struct stfu_envelope_point[]){[0] = {.dur = 0.02, .vol = 1.0},
[1] = {.dur = 0.5, .vol = 0.33},
[2] = {.dur = 1.0, .vol = 0}},
3);
}
static void cleanup(void) { saudio_shutdown(); }
@ -102,10 +133,11 @@ static void event(const sapp_event *e) {
break;
}
phaser0 = stfu_set_phaser_frequency(phaser0, key_frequency * 0.25);
phaser1 = stfu_set_phaser_frequency(phaser1, key_frequency * 0.125);
phaser2 = stfu_set_phaser_frequency(phaser2, key_frequency);
phaser0 = stfu_set_phaser_frequency(phaser0, key_frequency);
phaser1 = stfu_set_phaser_frequency(phaser1, key_frequency * 0.25);
phaser2 = stfu_set_phaser_frequency(phaser2, key_frequency * 2.0);
envelope = stfu_trigger_envelope(envelope);
crossfade_frames_left = STFU_CROSSFADE_BUFFER_FRAMES;
break;
}