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Optimize audio buffer duration calculation in MSMF capture. Fixes #27969 #28017 ### Description Cache the repeated calculation of `(bit_per_sample/8)*nChannels` in a local variable to avoid redundant computations in `grabFrame()` and `configureAudioFrame()` functions. ### Changes - Added `bytesPerSample` local variable in both functions - Replaced 6 repeated calculations with the cached variable - Improves performance in frequently called audio processing code Fixes #27969
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