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Add Loudness effect perceived loudness unit tests.

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This commit is contained in:
Max Maisel 2019-03-22 17:58:01 +01:00
parent 1d60a3882f
commit 2649179ef3
1 changed files with 111 additions and 1 deletions
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112
tests/octave/loudness_test.m
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@ -122,5 +122,115 @@ if TEST_LUFS_HELPER
printf("LUFS-selftest3.wav should be %f LUFS\n", calc_LUFS(x, fs));
end
# TODO: add tests here
## Test Loudness LUFS mode: stereo dependent
CURRENT_TEST = "Loudness LUFS mode, keep DC and stereo balance";
randn("seed", 1);
fs= 44100;
# Include some silecne in the test signal to test loudness gating
# and vary the overall loudness over time.
x = [0.1*randn(15*fs, 2).', zeros(5*fs, 2).', 0.1*randn(15*fs, 2).'].';
x(:,1) = x(:,1) .* sin(2*pi/fs/35*(1:1:35*fs)).' .* 1.2;
x(:,2) = x(:,2) .* sin(2*pi/fs/35*(1:1:35*fs)).';
audiowrite(TMP_FILENAME, x, fs);
if EXPORT_TEST_SIGNALS
audiowrite(cstrcat(pwd(), "/Loudness-LUFS-stereo-test.wav"), x, fs);
end
aud_do("SelectTracks: Track=0 TrackCount=100 Mode=Set\n");
aud_do("RemoveTracks:\n");
aud_do(cstrcat("Import2: Filename=\"", TMP_FILENAME, "\"\n"));
aud_do("Loudness: LUFSLevel=-23 DualMono=1 NormalizeTo=0 StereoIndependent=0\n");
aud_do(cstrcat("Export2: Filename=\"", TMP_FILENAME, "\" NumChannels=2\n"));
system("sync");
y = audioread(TMP_FILENAME);
do_test_equ(calc_LUFS(y, fs), -23, "loudness", LUFS_epsilon);
do_test_neq(calc_LUFS(y(:,1), fs), calc_LUFS(y(:,2), fs), "stereo balance", 1);
## Test Loudness LUFS mode, stereo independent
CURRENT_TEST = "Loudness LUFS mode, stereo independence";
audiowrite(TMP_FILENAME, x, fs);
aud_do("SelectTracks: Track=0 TrackCount=100 Mode=Set\n");
aud_do("RemoveTracks:\n");
aud_do(cstrcat("Import2: Filename=\"", TMP_FILENAME, "\"\n"));
aud_do("Loudness: LUFSLevel=-23 DualMono=0 NormalizeTo=0 StereoIndependent=1\n");
aud_do(cstrcat("Export2: Filename=\"", TMP_FILENAME, "\" NumChannels=2\n"));
system("sync");
y = audioread(TMP_FILENAME);
# Independently processed stereo channels have half the target loudness.
do_test_equ(calc_LUFS(y(:,1), fs), -26, "channel 1 loudness", LUFS_epsilon);
do_test_equ(calc_LUFS(y(:,2), fs), -26, "channel 2 loudness", LUFS_epsilon);
## Test Loudness LUFS mode: mono as mono
CURRENT_TEST = "Test Loudness LUFS mode: mono as mono";
x = x(:,1);
audiowrite(TMP_FILENAME, x, fs);
if EXPORT_TEST_SIGNALS
audiowrite(cstrcat(pwd(), "/Loudness-LUFS-mono-test.wav"), x, fs);
end
aud_do("SelectTracks: Track=0 TrackCount=100 Mode=Set\n");
aud_do("RemoveTracks:\n");
aud_do(cstrcat("Import2: Filename=\"", TMP_FILENAME, "\"\n"));
aud_do("Loudness: LUFSLevel=-26 DualMono=0 NormalizeTo=0 StereoIndependent=1\n");
aud_do(cstrcat("Export2: Filename=\"", TMP_FILENAME, "\" NumChannels=1\n"));
system("sync");
y = audioread(TMP_FILENAME);
do_test_equ(calc_LUFS(y, fs), -26, "loudness", LUFS_epsilon);
## Test Loudness LUFS mode: mono as dual-mono
CURRENT_TEST = "Test Loudness LUFS mode: mono as dual-mono";
audiowrite(TMP_FILENAME, x, fs);
aud_do("SelectTracks: Track=0 TrackCount=100 Mode=Set\n");
aud_do("RemoveTracks:\n");
aud_do(cstrcat("Import2: Filename=\"", TMP_FILENAME, "\"\n"));
aud_do("Loudness: LUFSLevel=-26 DualMono=1 NormalizeTo=0 StereoIndependent=0\n");
aud_do(cstrcat("Export2: Filename=\"", TMP_FILENAME, "\" NumChannels=1\n"));
system("sync");
y = audioread(TMP_FILENAME);
# This shall be 3 LU quieter as it is compared to strict spec.
do_test_equ(calc_LUFS(y, fs), -29, "loudness", LUFS_epsilon);
## Test Loudness LUFS mode: multi-rate project
CURRENT_TEST = "Test Loudness LUFS mode: multi-rate project";
audiowrite(TMP_FILENAME, x, fs);
aud_do("SelectTracks: Track=0 TrackCount=100 Mode=Set\n");
aud_do("RemoveTracks:\n");
aud_do(cstrcat("Import2: Filename=\"", TMP_FILENAME, "\"\n"));
randn("seed", 2);
fs1= 8000;
x1 = [0.2*randn(2, 10*fs1) zeros(2, 10*fs1) 0.1*randn(2, 10*fs1)].';
x1(:,1) = x1(:,1) * 0.6;
audiowrite(TMP_FILENAME, x1, fs1);
if EXPORT_TEST_SIGNALS
audiowrite(cstrcat(pwd(), "/Loudness-LUFS-stereo-test-8kHz.wav"), x1, fs1);
end
aud_do(cstrcat("Import2: Filename=\"", TMP_FILENAME, "\"\n"));
aud_do("SelectTracks: Track=0 TrackCount=100 Mode=Set\n");
aud_do("Loudness: LUFSLevel=-30 DualMono=0 NormalizeTo=0 StereoIndependent=0\n");
aud_do("SelectTracks: Track=0 TrackCount=1 Mode=Set\n");
aud_do(cstrcat("Export2: Filename=\"", TMP_FILENAME, "\" NumChannels=1\n"));
system("sync");
y = audioread(TMP_FILENAME);
aud_do("SelectTracks: Track=1 TrackCount=1 Mode=Set\n");
aud_do(cstrcat("Export2: Filename=\"", TMP_FILENAME, "\" NumChannels=2\n"));
system("sync");
y1 = audioread(TMP_FILENAME);
do_test_equ(calc_LUFS(y, fs), -30, "loudness track 1", LUFS_epsilon);
# XXX: Audacity does not export at 8kHz through scripting thus this test is expected to fail!
# To ensure that this works you have to set the project rate to 8 kHz,
# export the track and check the results manually.
do_test_equ(calc_LUFS(y1, fs1), -30, "loudness track 2", LUFS_epsilon, true);
# No stereo balance check for track 1 - it's a mono track.
do_test_neq(calc_LUFS(y1(:,1), fs), calc_LUFS(y1(:,2), fs), "stereo balance track 2", LUFS_epsilon);