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audioreactive optimization for -C3

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some optimizations for -C3.

* skip every second FFT, and use interpolation instead.
* reduce sampling rate from 22Khz to 18Khz
* new debug measurement for I2S cycle times (FFTTask)

--> in total, this brings CPU load for sound processing down to 60% (from >100% previously)
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Frank
2023-01-18 18:40:37 +01:00
parent ceab107602
commit 5575d6ab11
2 changed files with 105 additions and 49 deletions
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2
usermods/audioreactive/audio_source.h
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@@ -23,7 +23,7 @@
// see https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/hw-reference/chip-series-comparison.html#related-documents
// and https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/api-reference/peripherals/i2s.html#overview-of-all-modes
#if defined(CONFIG_IDF_TARGET_ESP32C2) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C5) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32H2) || defined(ESP8266) || defined(ESP8265)
#if defined(CONFIG_IDF_TARGET_ESP32C2) || defined(CONFIG_IDF_TARGET_ESP32C5) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32H2) || defined(ESP8266) || defined(ESP8265)
// there are two things in these MCUs that could lead to problems with audio processing:
// * no floating point hardware (FPU) support - FFT uses float calculations. If done in software, a strong slow-down can be expected (between 8x and 20x)
// * single core, so FFT task might slow down other things like LED updates