lpc: remove "decay" argument

We never used the rolling-average mode, and this makes av_update_lls 15% faster.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
lpc: use function pointers, in preparation for asm

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
x86: lpc: simd av_update_lls

4x-6x faster on sandybridge

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
x86: lpc: simd av_evaluate_lls

1.5x-1.8x faster on sandybridge

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
lpc: use levinson for the first pass of multipass cholesky

Levinson is faster, and cholesky is only needed if we want to apply different
weights to different samples, which doesn't happen on the first pass.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
pictor: use the correct logging context

Broken in 6d97484d72e33f7dde9493a9ead1a72e2f029605
wmapro: check the min_samples_per_subframe

Must be at least WMAPRO_BLOCK_MIN_SIZE.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
wmapro: error out on impossible scale factor offsets

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org