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LibAudio: Skip empty MP3 scale factor bands in stereo intensity process

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These were intentionally set up to be at the end of the granule size,
but since the stereo intensity loop is intentionally using a <= end
comparison (that’s how the scale factor bands work), we must skip these
dummy bands which would otherwise cause an out-of-bounds index.
This commit is contained in:
kleines Filmröllchen 2023-08-20 18:53:16 +02:00 committed by Andrew Kaster
parent 24f5914d18
commit a0bcc9dd83
Notes: sideshowbarker 2024-07-17 05:05:51 +09:00 
Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/a0bcc9dd83
Pull-request: https://github.com/SerenityOS/serenity/pull/20686
Reviewed-by: https://github.com/Hendiadyoin1
1 changed files with 3 additions and 0 deletions
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3
Userland/Libraries/LibAudio/MP3Loader.cpp
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@ -724,6 +724,9 @@ void MP3LoaderPlugin::process_stereo(MP3::MP3Frame& frame, size_t granule_index)
auto process_intensity_stereo = [&](MP3::Tables::ScaleFactorBand const& band, float intensity_stereo_ratio) {
for (size_t i = band.start; i <= band.end; i++) {
// Superflous empty scale factor band.
if (i >= MP3::granule_size)
continue;
float const sample_left = granule_left.samples[i];
float const coeff_l = intensity_stereo_ratio / (1 + intensity_stereo_ratio);
float const coeff_r = 1 / (1 + intensity_stereo_ratio);