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AR: add compile-time flag for "Automatic Gain Control" option

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Automatic Gain Control is a very important aspect of the audioreactive plugin,
and is vitally important when the external music volume constantly changes.

It makes sense to allow users to choose their preferred AGC behavior at
compile-time, since they can already set the Gain and Squelch via flags.

Adds `SR_AGC` as a flag, which defaults to 0 (off).
This commit is contained in:
Arcitec 2025-05-14 00:27:29 +02:00
parent cbe7d0678b
commit d381108dc0
2 changed files with 6 additions and 2 deletions
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5
usermods/audioreactive/audio_reactive.cpp
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@ -65,11 +65,14 @@ static bool udpSyncConnected = false; // UDP connection status -> true i
// audioreactive variables
#ifdef ARDUINO_ARCH_ESP32
#ifndef SR_AGC // Automatic gain control mode
#define SR_AGC 0 // default mode = off
#endif
static float micDataReal = 0.0f; // MicIn data with full 24bit resolution - lowest 8bit after decimal point
static float multAgc = 1.0f; // sample * multAgc = sampleAgc. Our AGC multiplier
static float sampleAvg = 0.0f; // Smoothed Average sample - sampleAvg < 1 means "quiet" (simple noise gate)
static float sampleAgc = 0.0f; // Smoothed AGC sample
static uint8_t soundAgc = 0; // Automagic gain control: 0 - none, 1 - normal, 2 - vivid, 3 - lazy (config value)
static uint8_t soundAgc = SR_AGC; // Automatic gain control: 0 - off, 1 - normal, 2 - vivid, 3 - lazy (config value)
#endif
//static float volumeSmth = 0.0f; // either sampleAvg or sampleAgc depending on soundAgc; smoothed sample
static float FFT_MajorPeak = 1.0f; // FFT: strongest (peak) frequency

3
usermods/audioreactive/readme.md
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@ -60,8 +60,9 @@ You can use the following additional flags in your `build_flags`
* `-D SR_SQUELCH=x` : Default "squelch" setting (10)
* `-D SR_GAIN=x` : Default "gain" setting (60)
* `-D SR_AGC=x` : (Only ESP32) Default "AGC (Automatic Gain Control)" setting (0): 0=off, 1=normal, 2=vivid, 3=lazy
* `-D I2S_USE_RIGHT_CHANNEL`: Use RIGHT instead of LEFT channel (not recommended unless you strictly need this).
* `-D I2S_USE_16BIT_SAMPLES`: Use 16bit instead of 32bit for internal sample buffers. Reduces sampling quality, but frees some RAM ressources (not recommended unless you absolutely need this).
* `-D I2S_USE_16BIT_SAMPLES`: Use 16bit instead of 32bit for internal sample buffers. Reduces sampling quality, but frees some RAM resources (not recommended unless you absolutely need this).
* `-D I2S_GRAB_ADC1_COMPLETELY`: Experimental: continuously sample analog ADC microphone. Only effective on ESP32. WARNING this *will* cause conflicts(lock-up) with any analogRead() call.
* `-D MIC_LOGGER` : (debugging) Logs samples from the microphone to serial USB. Use with serial plotter (Arduino IDE)
* `-D SR_DEBUG` : (debugging) Additional error diagnostics and debug info on serial USB.