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authorLynne <dev@lynne.ee>2019-03-15 14:43:04 +0000
committerCarl Eugen Hoyos <ceffmpeg@gmail.com>2019-04-01 00:22:00 +0200
commit605e3303109e7945a841c5fb5ff60881393933a3 (patch)
treea29fd08a08cb983a73bb937538b1b4c1add6dafb /libavformat/pcmdec.c
parent0cea3ca8943b5a3f28a3672037f424b4d03853b8 (diff)
downloadffmpeg-605e3303109e7945a841c5fb5ff60881393933a3.tar.gz
x86/opusdsp: implement FMA3 accelerated postfilter and deemphasis
58893 decicycles in deemphasis_c, 130548 runs, 524 skips 9475 decicycles in deemphasis_fma3, 130686 runs, 386 skips -> 6.21x speedup 24866 decicycles in postfilter_c, 65386 runs, 150 skips 5268 decicycles in postfilter_fma3, 65505 runs, 31 skips -> 4.72x speedup Total decoder speedup: ~14% Deemphasis SIMD based on the following unrolling: const float c1 = CELT_EMPH_COEFF, c2 = c1*c1, c3 = c2*c1, c4 = c3*c1; float state = coeff; for (int i = 0; i < len; i += 4) { y[0] = x[0] + c1*state; y[1] = x[1] + c2*state + c1*x[0]; y[2] = x[2] + c3*state + c1*x[1] + c2*x[0]; y[3] = x[3] + c4*state + c1*x[2] + c2*x[1] + c3*x[0]; state = y[3]; y += 4; x += 4; }
Diffstat (limited to 'libavformat/pcmdec.c')
0 files changed, 0 insertions, 0 deletions