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AR: samples dynamics limiter (experimental)

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to enable, compile with -D SOUND_DYNAMICS_LIMITER.
still missing UI integration, and more testing.
This commit is contained in:
Frank 2022-08-06 17:53:35 +02:00
parent d0f53cb14a
commit b46a6ed094
1 changed files with 37 additions and 1 deletions
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38
usermods/audioreactive/audio_reactive.h
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@ -26,7 +26,7 @@
// #define SR_DEBUG // generic SR DEBUG messages
// hackers corner
// nothing atm
//#define SOUND_DYNAMICS_LIMITER // experimental: define to enable a dynamics limiter that avoids "sudden flashes" at onsets. Makes some effects look more "smooth and fluent"
#ifdef SR_DEBUG
#define DEBUGSR_PRINT(x) Serial.print(x)
@ -647,6 +647,39 @@ class AudioReactive : public Usermod {
} // getSample()
/* Limits the dynamics of volumeSmth (= sampleAvg or sampleAgc).
* It does not affect FFTResult[] or volumeRaw ( = sample or rawSampleAgc)
*/
// effects: Gravimeter, Gravcenter, Gravcentric, Noisefire, Plasmoid, Freqpixels, Freqwave, Gravfreq, (2D Swirl, 2D Waverly)
// experimental, as it still has side-effects on AGC - AGC detects "silence" to late (due to long decay time) and ditches up the gain multiplier.
// values below will be made user-configurable later
const float attackTime = 200; // attack time -> 0.2sec
const float decayTime = 2800; // decay time -> 2.8sec
void limitSampleDynamics(void) {
#ifdef SOUND_DYNAMICS_LIMITER
const float bigChange = 196; // just a representative number - a large, expected sample value
static unsigned long last_time = 0;
static float last_volumeSmth = 0.0f;
if ((attackTime > 0) && (decayTime > 0)) { // only change volume if user has defined attack>0 and decay>0
long delta_time = millis() - last_time;
delta_time = constrain(delta_time , 1, 1000); // below 1ms -> 1ms; above 1sec -> sily lil hick-up
float maxAttack = bigChange * float(delta_time) / attackTime;
float maxDecay = - bigChange * float(delta_time) / decayTime;
float deltaSample = volumeSmth - last_volumeSmth;
if (deltaSample > maxAttack) deltaSample = maxAttack;
if (deltaSample < maxDecay) deltaSample = maxDecay;
volumeSmth = last_volumeSmth + deltaSample;
}
last_volumeSmth = volumeSmth;
last_time = millis();
#endif
}
void transmitAudioData()
{
if (!udpSyncConnected) return;
@ -922,6 +955,7 @@ class AudioReactive : public Usermod {
if (soundAgc) my_magnitude *= multAgc;
if (volumeSmth < 1 ) my_magnitude = 0.001f; // noise gate closed - mute
limitSampleDynamics(); // optional - makes volumeSmth very smooth and fluent
// update UI
uint8_t knownMode = strip.getFirstSelectedSeg().mode; // 1st selected segment is more appropriate than main segment
@ -982,6 +1016,8 @@ class AudioReactive : public Usermod {
transmitAudioData();
lastTime = millis();
}
//limitSampleDynamics(); // If done as the last step, it will also affect audio received by UDP sound sync. Problem: effects might see inconsistent intermediate values and start flickering :-(
}