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Audio: Selector: Add script to create downmix and upmix configurations
This patch adds script Octave tune/sof_selector_blobs.m. The script execute is also added to scripts/sof-rebuild-processing-comp-blobs.sh. Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
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‎scripts/sof-rebuild-processing-comp-blobs.sh‎

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@@ -39,4 +39,5 @@ cd "$SOF_WORKSPACE"/sof/src/audio/eq_iir/tune; $OCTAVE sof_example_iir_bandsplit
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cd "$SOF_WORKSPACE"/sof/src/audio/eq_iir/tune; $OCTAVE sof_example_spk_eq.m
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cd "$SOF_WORKSPACE"/sof/src/audio/multiband_drc/tune; $OCTAVE sof_example_multiband_drc.m
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cd "$SOF_WORKSPACE"/sof/src/audio/tdfb/tune; ./sof_example_all.sh
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cd "$SOF_WORKSPACE"/sof/src/audio/selector/tune; $OCTAVE ./sof_selector_blobs.m
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cd "$SOF_WORKSPACE"/sof/tools/tune/mfcc; $OCTAVE setup_mfcc.m

‎src/audio/selector/tune/sof_selector_blobs.m‎

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% Export configuration blobs for Selector
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% SPDX-License-Identifier: BSD-3-Clause
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%
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% Copyright (c) 2025, Intel Corporation.
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function sof_selector_blobs()
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% See ITU-R BS.775-4 for mix coefficient values
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sof_selector_paths(true);
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% Matrix for 1:1 pass-through
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sel.rsvd0 = 0;
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sel.rsvd1 = 0;
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sel.coeffs = diag(ones(8, 1));
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write_blob(sel, "passthrough");
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% Stereo to mono downmix
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sel.coeffs = zeros(8,8);
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sel.coeffs(1, 1) = 0.7071;
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sel.coeffs(1, 2) = 0.7071;
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write_blob(sel, "downmix_stereo_to_mono");
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% 5.1 to stereo downmix
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fl = 1; fr = 2; fc = 3; lfe = 4; sl = 5; sr = 6;
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m = zeros(8,8);
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m(1, fl) = 1.0000; m(1, fr) = 0.0000; m(1, fc) = 0.7071; m(1, sl) = 0.7071; m(1, sr) = 0.0000;
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m(2, fl) = 0.0000; m(2, fr) = 1.0000; m(2, fc) = 0.7071; m(2, sl) = 0.0000; m(2, sr) = 0.7071;
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sel.coeffs = m;
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write_blob(sel, "downmix_51_to_stereo");
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sel.coeffs(1, lfe) = 10^(+4/20); % +10 dB, attenuate by -6 dB to left
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sel.coeffs(2, lfe) = 10^(+4/20); % +10 dB, attenuate by -6 dB to right
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write_blob(sel, "downmix_51_to_stereo_with_lfe");
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% 5.1 to mono downmix
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fl = 1; fr = 2; fc = 3; lfe = 4; sl = 5; sr = 6;
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m = zeros(8,8);
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m(1, fl) = 0.7071; m(1, fr) = 0.7071; m(1, fc) = 1.0000; m(1, sl) = 0.5000; m(1, sr) = 0.5000;
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sel.coeffs = m;
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write_blob(sel, "downmix_51_to_mono");
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sel.coeffs(1, lfe) = 10^(+10/20);
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write_blob(sel, "downmix_51_to_mono_with_lfe");
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% 7.1 to 5.1 downmix
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fl8 = 1; fr8 = 2; fc8 = 3; lfe8 = 4; bl8 = 5; br8 = 6; sl8 = 7; sr8 = 8;
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fl6 = 1; fr6 = 2; fc6 = 3; lfe6 = 4; sl6 = 5; sr6 = 6;
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m = zeros(8,8);
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m(fl6, fl8) = 1;
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m(fr6, fr8) = 1;
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m(fc6, fc8) = 1;
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m(sl6, sl8) = 1;
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m(sr6, sr8) = 1;
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m(sl6, bl8) = 1;
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m(sr6, br8) = 1;
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m(lfe6, lfe8) = 1;
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sel.coeffs = m;
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write_blob(sel, "downmix_71_to_51");
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% 7.1 to 5.1 downmix
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fl = 1; fr = 2; fc = 3; lfe = 4; bl = 5; br = 6; sl = 7; sr = 8;
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m = zeros(8,8);
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m(1, fl) = 1.0000; m(1, fr) = 0.0000; m(1, fc) = 0.7071; m(1, sl) = 0.7071; m(1, sr) = 0.0000; m(1, bl) = 0.7071; m(1, br) = 0.0000;
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m(2, fl) = 0.0000; m(2, fr) = 1.0000; m(2, fc) = 0.7071; m(2, sl) = 0.0000; m(2, sr) = 0.7071; m(2, bl) = 0.0000; m(2, br) = 0.7071;
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sel.coeffs = m;
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write_blob(sel, "downmix_71_to_stereo");
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sel.coeffs(1, lfe) = 10^(+4/20); % +10 dB, attenuate by -6 dB to left
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sel.coeffs(2, lfe) = 10^(+4/20); % +10 dB, attenuate by -6 dB to right
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write_blob(sel, "downmix_71_to_stereo_with_lfe");
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% 7.1 to mono downmix
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fl = 1; fc = 3; fr = 2; sr = 8; br = 6; bl = 5; sl = 7; lfe = 4;
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m = zeros(8,8);
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m(1, fl) = 0.7071; m(1, fr) = 0.7071; m(1, fc) = 1.0000; m(1, sl) = 0.5000; m(1, sr) = 0.5000; m(1, bl) = 0.5000; m(1, br) = 0.5000;
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sel.coeffs = m;
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write_blob(sel, "downmix_71_to_mono");
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m(1, lfe) = 10^(+19/20); % +10 dB
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write_blob(sel, "downmix_71_to_mono_with_lfe");
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% mono to stereo upmix
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sel.coeffs = zeros(8,8);
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sel.coeffs(1, 1) = 10^(-3/20);
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sel.coeffs(2, 1) = 10^(-3/20);
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write_blob(sel, "upmix_mono_to_stereo");
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% mono to 5.1 / 7.1 upmix
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fc = 3
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sel.coeffs = zeros(8,8);
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sel.coeffs(fc, 1) = 1;
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write_blob(sel, "upmix_mono_to_51");
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write_blob(sel, "upmix_mono_to_71");
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% stereo to 5.1 / 7.1 upmix
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fl = 1; fr = 2;
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sel.coeffs = zeros(8,8);
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sel.coeffs(fl, 1) = 1;
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sel.coeffs(fr, 2) = 1;
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write_blob(sel, "upmix_stereo_to_51");
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write_blob(sel, "upmix_stereo_to_71");
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sof_selector_paths(false);
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end
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function write_blob(sel, blobname)
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str_config = "selector_config";
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str_exported = "Exported with script sof_selector_blobs.m";
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str_howto = "cd tools/tune/selector; octave sof_selector_blobs.m"
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sof_tools = '../../../../tools';
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sof_tplg = fullfile(sof_tools, 'topology');
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sof_tplg_selector = fullfile(sof_tplg, 'topology2/include/components/micsel');
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sel
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sum_coefs = sum(sel.coeffs, 2)'
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max_sum_coef = max(sum_coefs)
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if max_sum_coef > 1
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scale = 1 / max_sum_coef;
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else
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scale = 1;
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end
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scale
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sel.coeffs = scale .* sel.coeffs';
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blob8 = sof_selector_build_blob(sel);
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tplg2_fn = sprintf("%s/%s.conf", sof_tplg_selector, blobname);
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sof_check_create_dir(tplg2_fn);
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sof_tplg2_write(tplg2_fn, blob8, str_config, str_exported, str_howto);
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end
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function sof_selector_paths(enable)
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common = '../../../../tools/tune/common';
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if enable
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addpath(common);
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else
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rmpath(common);
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end
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end
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function blob8 = sof_selector_build_blob(sel)
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s = size(sel.coeffs);
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blob_type = 0;
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blob_param_id = 0; % IPC4_SELECTOR_COEFFS_CONFIG_ID
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data_length = s(1) * s(2) + 2;
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data_size = 2 * data_length; % int16_t matrix
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coeffs_vec = reshape(sel.coeffs, 1, []); % convert to row vector
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coeffs_q10 = int16(round(coeffs_vec .* 1024)); % Q6.10
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ipc_ver = 4;
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[abi_bytes, abi_size] = sof_get_abi(data_size, ipc_ver, blob_type, blob_param_id);
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blob_size = data_size + abi_size;
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blob8 = uint8(zeros(1, blob_size));
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blob8(1:abi_size) = abi_bytes;
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j = abi_size + 1;
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% header
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blob8(j:j+1) = int16_to_byte(int16(sel.rsvd0));
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j = j + 2;
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blob8(j:j+1) = int16_to_byte(int16(sel.rsvd1));
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j = j + 2;
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% coeffs matrix
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for i = 1:(s(1) * s(2))
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blob8(j:j+1) = int16_to_byte(coeffs_q10(i));
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j = j + 2;
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end
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end
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function bytes = int16_to_byte(word)
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sh = [0 -8];
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bytes = uint8(zeros(1,2));
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bytes(1) = bitand(bitshift(word, sh(1)), 255);
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bytes(2) = bitand(bitshift(word, sh(2)), 255);
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end

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