avfilter/x86/f_ebur128: add x86 AVX implementation

Processes two channels in parallel, using 128-bit XMM registers.

In theory, we could go up to YMM registers to process 4 channels, but this is
not a gain except for relatively high channel counts (e.g. 7.1), and also
complicates the sample load/store operations considerably.

I decided to only add an AVX variant, since the C code is not substantially
slower enough to justify a separate function just for ancient CPUs.

0 files changed, 0 insertions, 0 deletions