index out of range for inputs slightly longer than 12 seconds (or multiples)

[mtorcoli]

Hi,

First of all, thanks for making binaqual openly available.

Issue

I’m encountering an IndexError: list index out of range when the input audio length is slightly longer than a multiple of 12 seconds.

File ".../Binaqual/vnsim.py", line 107, in calc_ref_test_similarity
    neurogram_map = mask_patches[patch_index] * neurogram_map
                    ~~~~~~~~~~~~^^^^^^^^^^^^^
IndexError: list index out of range

Observation

It appears that mask_patches contains fewer patches than ref_patches and test_patches, which leads to the out-of-range access.

Reproduction

I can consistently reproduce the issue using randomly generated audio whose length is just a few samples longer than an exact multiple of 12 seconds:

FS = 48000
# random integer number
N = np.random.randint(1, 20) # random multiplier of 12 seconds
remainder = np.random.randint(1, 60)  # random number of remaining samples to add 
print(f"N: {N}, remainder: {remainder}")
length = 12*N*FS + remainder

# Generate random stereo noise
noise_ref = np.random.randn(length, 2)
noise_test = np.random.randn(length, 2)

# Create temp files
ref_temp = tempfile.NamedTemporaryFile(suffix='.wav', delete=False)
test_temp = tempfile.NamedTemporaryFile(suffix='.wav', delete=False)

try:
    sf.write(ref_temp.name, noise_ref, FS)
    sf.write(test_temp.name, noise_test, FS)

    nsim_values, LS = calculate_binaqual(
        Path(ref_temp.name),
        Path(test_temp.name),
        intensity_threshold=-180,
        elc=0,
        ignore_freq_bands=0
    )
    print(f"NSIM values: {nsim_values}")
    print(f"LS: {LS}")
finally:
    ref_temp.close()
    test_temp.close()
    os.unlink(ref_temp.name)
    os.unlink(test_temp.name)

I hope this issue report helps!