mirror of https://github.com/thesofproject/sof.git
123 lines
4.2 KiB
Matlab
123 lines
4.2 KiB
Matlab
function example_multiband_drc();
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% Set the parameters here
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tplg_fn = "../../topology/topology1/m4/multiband_drc_coef_default.m4"; % Control Bytes File
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% Use those files with sof-ctl to update the component's configuration
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blob_fn = "../../ctl/multiband_drc_coef.blob"; % Blob binary file
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alsa_fn = "../../ctl/multiband_drc_coef.txt"; % ALSA CSV format file
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endian = "little";
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sample_rate = 48000;
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nyquist = sample_rate / 2;
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% Number of bands, valid values: 1,2,3,4
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num_bands = 3;
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% 1 to enable Emphasis/Deemphasis filter, 0 to disable it
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enable_emp_deemp = 1;
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% The parameters of Emphasis IIR filter
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% stage_gain: The gain of each emphasis filter stage
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iir_params.stage_gain = 4.4;
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% stage_ratio: The frequency ratio for each emphasis filter stage to the
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% previous stage
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iir_params.stage_ratio = 2;
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% anchor: The frequency of the first emphasis filter, in normalized frequency
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% (in [0, 1], relative to half of the sample rate)
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iir_params.anchor = 15000 / nyquist;
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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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% threshold: The value above which the compression starts, in dB
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% knee: The value above which the knee region starts, in dB
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% ratio: The input/output dB ratio after the knee region
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% attack: The time to reduce the gain by 10dB, in seconds
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% release: The time to increase the gain by 10dB, in seconds
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% pre_delay: The lookahead time for the compressor, in seconds
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% release_zone[4]: The adaptive release curve parameters
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% release_spacing: The value of spacing per frame while releasing, in dB
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% post_gain: The static boost value in output, in dB
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% band_lower_freq: The lower frequency of the band, in normalized frequency
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% (in [0, 1], relative to half of the sample rate)
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% Band 1 DRC parameter
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drc_params(1).enabled = 0;
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drc_params(1).threshold = -24;
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drc_params(1).knee = 30;
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drc_params(1).ratio = 12;
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drc_params(1).attack = 0.003;
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drc_params(1).release = 0.2;
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drc_params(1).pre_delay = 0.006;
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drc_params(1).release_zone = [0.09 0.16 0.42 0.98];
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drc_params(1).release_spacing = 5;
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drc_params(1).post_gain = 0;
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drc_params(1).band_lower_freq = 0;
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% Band 2 DRC parameter (only valid if num_bands > 1)
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drc_params(2).enabled = 0;
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drc_params(2).threshold = -24;
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drc_params(2).knee = 30;
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drc_params(2).ratio = 12;
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drc_params(2).attack = 0.003;
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drc_params(2).release = 0.2;
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drc_params(2).pre_delay = 0.006;
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drc_params(2).release_zone = [0.09 0.16 0.42 0.98];
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drc_params(2).release_spacing = 5;
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drc_params(2).post_gain = 0;
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drc_params(2).band_lower_freq = 200 / nyquist;
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% Band 3 DRC parameter (only valid if num_bands > 2)
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drc_params(3).enabled = 0;
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drc_params(3).threshold = -24;
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drc_params(3).knee = 30;
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drc_params(3).ratio = 12;
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drc_params(3).attack = 0.003;
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drc_params(3).release = 0.2;
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drc_params(3).pre_delay = 0.006;
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drc_params(3).release_zone = [0.09 0.16 0.42 0.98];
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drc_params(3).release_spacing = 5;
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drc_params(3).post_gain = 0;
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drc_params(3).band_lower_freq = 2000 / nyquist;
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% Band 4 DRC parameter (only valid if num_bands > 3)
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drc_params(4).enabled = 0;
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drc_params(4).threshold = -24;
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drc_params(4).knee = 30;
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drc_params(4).ratio = 12;
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drc_params(4).attack = 0.003;
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drc_params(4).release = 0.2;
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drc_params(4).pre_delay = 0.006;
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drc_params(4).release_zone = [0.09 0.16 0.42 0.98];
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drc_params(4).release_spacing = 5;
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drc_params(4).post_gain = 0;
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drc_params(4).band_lower_freq = 10000 / nyquist;
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% Generate Emphasis/Deemphasis IIR filter quantized coefs struct from parameters
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[emp_coefs, deemp_coefs] = iir_gen_quant_coefs(iir_params);
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% Generate Crossover quantized coefs struct from parameters
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crossover_coefs = crossover_gen_quant_coefs(num_bands, sample_rate,
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drc_params(2).band_lower_freq,
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drc_params(3).band_lower_freq,
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drc_params(4).band_lower_freq);
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% Generate DRC quantized coefs struct from parameters
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drc_coefs = drc_gen_quant_coefs(num_bands, sample_rate, drc_params);
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% Convert quantized coefs structs to binary blob
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blob8 = multiband_drc_build_blob(num_bands, enable_emp_deemp, emp_coefs,
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deemp_coefs, crossover_coefs, drc_coefs,
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endian);
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% Generate output files
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addpath ../common
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tplg_write(tplg_fn, blob8, "MULTIBAND_DRC");
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blob_write(blob_fn, blob8);
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alsactl_write(alsa_fn, blob8);
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rmpath ../common
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endfunction
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