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stft_process

README.md

STFT Process Architecture

This directory provides Short-Time Fourier Transform (STFT) utilities.

Overview

Converts time-domain audio slices into the frequency domain using FFTs, runs frequency-domain processing over those bins, and applies the inverse-STFT (Overlap-Add) back to the time-domain.

Configuration and Scripts

  • Kconfig: Manages the STFT processing component (COMP_STFT_PROCESS) and requires multi-channel 32-bit FFT math libraries (MATH_FFT, MATH_32BIT_FFT, MATH_FFT_MULTI). Also optionally supports converting pure FFTs into polar magnitude and phase domains (STFT_PROCESS_MAGNITUDE_PHASE).
  • CMakeLists.txt: Compiles generic STFT operations (stft_process.c, stft_process_common.c, stft_process-generic.c) and IPC4 wrappers (stft_process-ipc4.c), fully supporting the llext format.
  • stft_process.toml: Defines the default STFTPROC module layout with UUID UUIDREG_STR_STFT_PROCESS.
  • Topology (.conf): Instantiated from tools/topology/topology2/include/components/stft_process.conf, creating a stft_process widget type effect (UUID a6:6e:11:0d:50:91:de:46:98:b8:b2:b3:a7:91:da:29).