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AR memory optimization - part 1

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allocating FFT buffers late makes up to 16Kb heap available when audioreactive is not enabled.

Already tested in MM fork.
This commit is contained in:
Frank 2024-10-22 14:45:32 +02:00
parent 7db1989093
commit 01d43c69fb
1 changed files with 18 additions and 12 deletions
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30
usermods/audioreactive/audio_reactive.h
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@ -191,8 +191,8 @@ constexpr uint16_t samplesFFT_2 = 256; // meaningfull part of FFT resul
#define LOG_256 5.54517744f // log(256)
// These are the input and output vectors. Input vectors receive computed results from FFT.
static float vReal[samplesFFT] = {0.0f}; // FFT sample inputs / freq output - these are our raw result bins
static float vImag[samplesFFT] = {0.0f}; // imaginary parts
static float* vReal = nullptr; // FFT sample inputs / freq output - these are our raw result bins
static float* vImag = nullptr; // imaginary parts
// Create FFT object
// lib_deps += https://github.com/kosme/arduinoFFT#develop @ 1.9.2
@ -200,14 +200,9 @@ static float vImag[samplesFFT] = {0.0f}; // imaginary parts
// #define FFT_SPEED_OVER_PRECISION // enables use of reciprocals (1/x etc) - not faster on ESP32
// #define FFT_SQRT_APPROXIMATION // enables "quake3" style inverse sqrt - slower on ESP32
// Below options are forcing ArduinoFFT to use sqrtf() instead of sqrt()
#define sqrt(x) sqrtf(x) // little hack that reduces FFT time by 10-50% on ESP32
#define sqrt_internal sqrtf // see https://github.com/kosme/arduinoFFT/pull/83
#include <arduinoFFT.h>
/* Create FFT object with weighing factor storage */
static ArduinoFFT<float> FFT = ArduinoFFT<float>( vReal, vImag, samplesFFT, SAMPLE_RATE, true);
// #define sqrt_internal sqrtf // see https://github.com/kosme/arduinoFFT/pull/83 - since v2.0.0 this must be done in build_flags
#include <arduinoFFT.h> // FFT object is created in FFTcode
// Helper functions
// compute average of several FFT result bins
@ -226,6 +221,18 @@ void FFTcode(void * parameter)
{
DEBUGSR_PRINT("FFT started on core: "); DEBUGSR_PRINTLN(xPortGetCoreID());
// allocate FFT buffers on first call
if (vReal == nullptr) vReal = (float*) calloc(sizeof(float), samplesFFT);
if (vImag == nullptr) vImag = (float*) calloc(sizeof(float), samplesFFT);
if ((vReal == nullptr) || (vImag == nullptr)) {
// something went wrong
if (vReal) free(vReal); vReal = nullptr;
if (vImag) free(vImag); vImag = nullptr;
return;
}
// Create FFT object with weighing factor storage
ArduinoFFT<float> FFT = ArduinoFFT<float>( vReal, vImag, samplesFFT, SAMPLE_RATE, true);
// see https://www.freertos.org/vtaskdelayuntil.html
const TickType_t xFrequency = FFT_MIN_CYCLE * portTICK_PERIOD_MS;
@ -247,6 +254,7 @@ void FFTcode(void * parameter)
// get a fresh batch of samples from I2S
if (audioSource) audioSource->getSamples(vReal, samplesFFT);
memset(vImag, 0, samplesFFT * sizeof(float)); // set imaginary parts to 0
#if defined(WLED_DEBUG) || defined(SR_DEBUG)
if (start < esp_timer_get_time()) { // filter out overflows
@ -265,8 +273,6 @@ void FFTcode(void * parameter)
// find highest sample in the batch
float maxSample = 0.0f; // max sample from FFT batch
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]);
@ -297,7 +303,7 @@ void FFTcode(void * parameter)
#endif
} else { // noise gate closed - only clear results as FFT was skipped. MIC samples are still valid when we do this.
memset(vReal, 0, sizeof(vReal));
memset(vReal, 0, samplesFFT * sizeof(float));
FFT_MajorPeak = 1;
FFT_Magnitude = 0.001;
}