mirror of https://github.com/thesofproject/sof.git
85 lines
2.8 KiB
Matlab
85 lines
2.8 KiB
Matlab
function example_drc()
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addpath ../common
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% The parameters of the DRC compressor
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% enabled: 1 to enable the compressor, 0 to disable it
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params.enabled = 0;
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% threshold: The value above which the compression starts, in dB
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params.threshold = -24;
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% knee: The value above which the knee region starts, in dB
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params.knee = 30;
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% ratio: The input/output dB ratio after the knee region
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params.ratio = 12;
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% attack: The time to reduce the gain by 10dB, in seconds
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params.attack = 0.003;
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% release: The time to increase the gain by 10dB, in seconds
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params.release = 0.25;
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% pre_delay: The lookahead time for the compressor, in seconds
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params.pre_delay = 0.006;
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% release_zone[4]: The adaptive release curve parameters
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params.release_zone = [0.09 0.16 0.42 0.98];
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% release_spacing: The value of spacing per frame while releasing, in dB
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params.release_spacing = 5;
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% post_gain: The static boost value in output, in dB
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params.post_gain = 0;
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% Export
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drc_coefs_and_config_export(params, 'passthrough');
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% Export enabled
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params.enabled = 1;
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drc_coefs_and_config_export(params, 'enabled');
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% Export experimental configuration for a small speaker
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params.enabled = 1;
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params.threshold = -25;
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params.knee = 15;
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params.ratio = 10;
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params.post_gain = 3;
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drc_coefs_and_config_export(params, 'generic_notebook_speaker');
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rmpath ../common
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end
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function drc_coefs_and_config_export(params, id)
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% Set the parameters here
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tplg1_fn = sprintf("../../topology/topology1/m4/drc_coef_%s.m4", id); % Control Bytes File
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tplg2_fn = sprintf("../../topology/topology2/include/components/drc/%s.conf", id); % Control Bytes File
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% Use those files with sof-ctl to update the component's configuration
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blob3_fn = sprintf("../../ctl/ipc3/drc_coef_%s.blob", id); % Blob binary file
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alsa3_fn = sprintf("../../ctl/ipc3/drc_coef_%s.txt", id); % ALSA CSV format file
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blob4_fn = sprintf("../../ctl/ipc4/drc/%s.blob", id); % Blob binary file
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alsa4_fn = sprintf("../../ctl/ipc4/drc/%s.txt", id); % ALSA CSV format file
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endian = "little";
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sample_rate = 48000;
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% Generate coefficients for DRC with the given parameters
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coefs = drc_gen_coefs(params, sample_rate);
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% Convert coefficients to sof_drc_config struct
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config = drc_generate_config(coefs);
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% Convert struct to binary blob
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blob8 = drc_build_blob(config, endian);
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blob8_ipc4 = drc_build_blob(config, endian, 4);
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% Generate output files
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my_name = mfilename();
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drc_note = sprintf("Exported with script %s.m", my_name);
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drc_howto = sprintf("cd tools/tune/drc; octave --no-window-system %s.m", my_name);
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tplg_write(tplg1_fn, blob8, "DRC", drc_note, drc_howto);
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tplg2_write(tplg2_fn, blob8_ipc4, "drc_config", drc_note, drc_howto);
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blob_write(blob3_fn, blob8);
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alsactl_write(alsa3_fn, blob8);
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blob_write(blob4_fn, blob8_ipc4);
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alsactl_write(alsa4_fn, blob8_ipc4);
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% Plot x-y response in dB
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drc_plot_db_curve(coefs);
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end
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