This directory contains the DRC component.

The Dynamic Range Compressor reduces the volume of loud sounds or amplifies quiet sounds by narrowing or "compressing" an audio signal's dynamic range.

graph TD
  In[Audio Input] --> Det[Envelope Detector]
  In --> Gain[Gain Element]
  Det --> Calc[Gain Calculation]
  Calc --> Gain
  Gain --> Out[Audio Output]

• Kconfig: Enables the Dynamic Range Compressor component (COMP_DRC). It relies on various math features like CORDIC_FIXED, MATH_LUT_SINE_FIXED, and MATH_EXP. The maximum number of pre-delay frames is tunable via DRC_MAX_PRE_DELAY_FRAMES (defaults to 512).
• CMakeLists.txt: Manages local base sources and generic/HIFI specific files such as drc_hifi4.c and drc_math_hifi3.c. Adds logging capabilities if compiled in (drc_log.c).
• drc.toml: Topology parameters for the DRC module definition, exposing UUID and standard buffer sizes and processing capabilities.
• Topology (.conf): tools/topology/topology2/include/components/drc.conf configures the drc widget object, providing switch controls by binding a mixer control to switch get/put handlers (259). Defaults to type effect with UUID da:e4:6e:b3:6f:00:f9:47:a0:6d:fe:cb:e2:d8:b6:ce.
• MATLAB Tuning (tune/): Contains .m scripts (e.g., sof_example_drc.m) capable of tuning compressor parameters (threshold, knee, ratio, attack, release) and visualizing their gain reaction curves. The outputs are exported as .conf configurations, M4 macros, and ALSA alsactl payload blobs for preset instantiation defaults (e.g., speaker or DMIC presets).