function example_drc(); % Set the parameters here tplg_fn = "../../topology/topology1/m4/drc_coef_default.m4"; % Control Bytes File % Use those files with sof-ctl to update the component's configuration blob_fn = "../../ctl/drc_coef.blob"; % Blob binary file alsa_fn = "../../ctl/drc_coef.txt"; % ALSA CSV format file endian = "little"; sample_rate = 48000; % The parameters of the DRC compressor % enabled: 1 to enable the compressor, 0 to disable it params.enabled = 0; % threshold: The value above which the compression starts, in dB params.threshold = -24; % knee: The value above which the knee region starts, in dB params.knee = 30; % ratio: The input/output dB ratio after the knee region params.ratio = 12; % attack: The time to reduce the gain by 10dB, in seconds params.attack = 0.003; % release: The time to increase the gain by 10dB, in seconds params.release = 0.25; % pre_delay: The lookahead time for the compressor, in seconds params.pre_delay = 0.006; % release_zone[4]: The adaptive release curve parameters params.release_zone = [0.09 0.16 0.42 0.98]; % release_spacing: The value of spacing per frame while releasing, in dB params.release_spacing = 5; % post_gain: The static boost value in output, in dB params.post_gain = 0; % Generate coefficients for DRC with the given parameters coefs = drc_gen_coefs(params, sample_rate); % Convert coefficients to sof_drc_config struct config = drc_generate_config(coefs); % Convert struct to binary blob blob8 = drc_build_blob(config, endian); % Generate output files addpath ./../common tplg_write(tplg_fn, blob8, "DRC"); blob_write(blob_fn, blob8); alsactl_write(alsa_fn, blob8); % Plot x-y response in dB drc_plot_db_curve(coefs); rmpath ./../common endfunction