Jan/WLED_MM_Infinity
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

audioreactive small optimization

Browse Source 
* clear vImag[] using memset
* zerocrossing detection: directly check sign bit
This commit is contained in:
Frank
2024-04-10 12:34:32 +02:00
committed by GitHub
parent 164c9a12cc
commit b27686bd2b
1 changed files with 5 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
usermods/audioreactive/audio_reactive.h
View File

@@ -7,6 +7,7 @@
#include <driver/i2s.h>
#include <driver/adc.h>
#include <math.h>
#endif
#if defined(ARDUINO_ARCH_ESP32) && (defined(WLED_DEBUG) || defined(SR_DEBUG))
@@ -545,12 +546,13 @@ void FFTcode(void * parameter)
}
}
// set imaginary parts to 0
memset(vImag, 0, sizeof(vImag));
// find highest sample in the batch, and count zero crossings
float maxSample = 0.0f; // max sample from FFT batch
uint_fast16_t newZeroCrossingCount = 0;
for (int i=0; i < samplesFFT; i++) {
// set imaginary parts to 0
vImag[i] = 0;
// pick our our current mic sample - we take the max value from all samples that go into FFT
if ((vReal[i] <= (INT16_MAX - 1024)) && (vReal[i] >= (INT16_MIN + 1024))) //skip extreme values - normally these are artefacts
if (fabsf((float)vReal[i]) > maxSample) maxSample = fabsf((float)vReal[i]);
@@ -558,9 +560,8 @@ void FFTcode(void * parameter)
// WLED-MM/TroyHacks: Calculate zero crossings
//
if (i < (samplesFFT-1)) {
if((vReal[i] >= 0 && vReal[i+1] < 0) || (vReal[i] < 0 && vReal[i+1] >= 0)) {
if (__builtin_signbit(vReal[i]) != __builtin_signbit(vReal[i+1])) // test sign bit: sign changed -> zero crossing
newZeroCrossingCount++;
}
}
}
newZeroCrossingCount = (newZeroCrossingCount*2)/3; // reduce value so it typicially stays below 256