Audio: Level Multiplier: Add blobs generate script

This patch adds script sof_level_multiplier_blobs.m It exports
blobs for -40 to +40 dB gain configuration.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

scripts/sof-rebuild-processing-comp-blobs.sh

@@ -41,3 +41,4 @@ cd "$SOF_WORKSPACE"/sof/src/audio/multiband_drc/tune; $OCTAVE sof_example_multib
 cd "$SOF_WORKSPACE"/sof/src/audio/tdfb/tune; ./sof_example_all.sh
 cd "$SOF_WORKSPACE"/sof/src/audio/selector/tune; $OCTAVE ./sof_selector_blobs.m
 cd "$SOF_WORKSPACE"/sof/tools/tune/mfcc; $OCTAVE setup_mfcc.m
+cd "$SOF_WORKSPACE"/sof/src/audio/level_multiplier/tune; $OCTAVE sof_level_multiplier_blobs.m

src/audio/level_multiplier/tune/sof_level_multiplier_blobs.m

@@ -0,0 +1,83 @@
+% Export configuration blobs for Level Multiplier
+%
+% This script creates configuration blobs for the Level Multiplier
+% component to apply gains -40, -30, -20, -10, 0, 10, 20, 30, 40 dB.
+% Run the script interactively from Octave shell with just command:
+%
+% sof_level_multiplier_blobs
+%
+% There are no arguments for the function. Or from SOF level directory
+% with command:
+%
+% cd src/audio/level_multiplier/tune; octave sof_level_multiplier_blobs.m
+%
+
+% SPDX-License-Identifier: BSD-3-Clause
+%
+% Copyright (c) 2025, Intel Corporation.
+
+function sof_level_multiplier_blobs()
+
+	% Set the parameters here
+	sof_tools = '../../../../tools';
+	sof_tplg = fullfile(sof_tools, 'topology/topology2');
+	sof_tplg_level_multiplier = fullfile(sof_tplg, 'include/components/level_multiplier');
+	sof_ctl_level_multiplier = fullfile(sof_tools, 'ctl/ipc4/level_multiplier');
+
+	sof_level_multiplier_paths(true);
+
+	for param = -40:10:40
+		gain_value = sof_level_multiplier_db2lin(param);
+		blob8 = sof_level_multiplier_build_blob(gain_value);
+		tplg2_fn = sprintf("%s/gain_%d_db.conf", sof_tplg_level_multiplier, param);
+		sof_tplg2_write(tplg2_fn, blob8, "level_multiplier_config", ...
+				"Exported with script sof_level_multiplier_blobs.m" , ...
+				"cd tools/tune/level_multiplier; octave sof_level_multiplier_blobs.m");
+		ctl_fn = sprintf("%s/gain_%d_db.txt", sof_ctl_level_multiplier, param);
+		sof_alsactl_write(ctl_fn, blob8);
+	end
+
+	sof_level_multiplier_paths(false);
+end
+
+function lin_value = sof_level_multiplier_db2lin(db)
+	scale = 2^23;
+	lin_value = int32(10^(db/20) * scale);
+end
+
+function sof_level_multiplier_paths(enable)
+
+	common = '../../../../tools/tune/common';
+	if enable
+		addpath(common);
+	else
+		rmpath(common);
+	end
+end
+
+function blob8 = sof_level_multiplier_build_blob(param_values)
+
+	blob_type = 0;
+	blob_param_id = 1;
+	data_length = length(param_values);
+	data_size = 4 * data_length;
+	ipc_ver = 4;
+	[abi_bytes, abi_size] = sof_get_abi(data_size, ipc_ver, blob_type, blob_param_id);
+	blob_size = data_size + abi_size;
+	blob8 = uint8(zeros(1, blob_size));
+	blob8(1:abi_size) = abi_bytes;
+	j = abi_size + 1;
+	for i = 1:data_length
+		blob8(j:j+3) = word2byte(param_values(i));
+		j=j+4;
+	end
+end
+
+function bytes = word2byte(word)
+        sh = [0 -8 -16 -24];
+	bytes = uint8(zeros(1,4));
+	bytes(1) = bitand(bitshift(word, sh(1)), 255);
+	bytes(2) = bitand(bitshift(word, sh(2)), 255);
+	bytes(3) = bitand(bitshift(word, sh(3)), 255);
+	bytes(4) = bitand(bitshift(word, sh(4)), 255);
+end