Hi, I was going through histogram based implementation to compute program loudness in ffmpeg\libavfilter\ebur128.c. This implementation uses static tables like "histogram_energy_boundaries[]" and "histogram_energies[]" in 3 main steps to compute gated loudness.
** 1. Using histogram_energy_boundaries[], loudness sum is first recorded into "block_energy_histogram[]" in the form of an increment in the corresponding energy index. 2. Relative threshold is computed using “block_energy_histogram[]" and "histogram_energies[]". 3. Finally , gated loudness is computed using "block_energy_histogram[]" and "histogram_energies[]" as per computed "relative threshold". ** At first look, it looks like an optimised implementation over conventional implementation of storing and using loudness sums in a growing linked list to compute gated loudness. However, I am wondering if there is any reference documentation or a summary which can help me to understand this implementation a bit more including associated drawbacks such as precision loss over conventional implementation . Thanks, Rohit
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