Chiebot-Mirror/FFmpeg - FFmpeg - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Lynne	6b22e28f4c	opusdsp: adjust and optimize C function to match assembly The C and asm versions behaved differently _outside_ of the codec. The C version returned pre-multiplied 'state' for the next execution to use right away, while the assembly version outputted non-multiplied 'state' for the next execution to multiply to save instructions. Since the initial state when initialized or seeking is always 0, and since C and asm versions were never mixed, there was no issue. However, comparing outputs directly in checkasm doesn't work without dividing the initial state by CELT_EMPH_COEFF and multiplying the returned state by CELT_EMPH_COEFF for the assembly function. Since its actually faster to do this in C as well, copy the behavior the asm versions use. As a reminder, the initial state 0 is divided by CELT_EMPH_COEFF on seek and init (just in case in the future this is changed, its technically more correct to init with CELT_EMPH_COEFF than 0, however when seeking this will result in more audiable pops, unlike with 0 where the output gets in sync over a few samples).	6 years ago
Lynne	4d2f62150d	aarch64/opusdsp: implement NEON accelerated postfilter and deemphasis 153372 UNITS in postfilter_c, 65536 runs, 0 skips 73164 UNITS in postfilter_neon, 65536 runs, 0 skips -> 2.1x speedup 80591 UNITS in deemphasis_c, 131072 runs, 0 skips 43969 UNITS in deemphasis_neon, 131072 runs, 0 skips -> 1.83x speedup Total decoder speedup: ~15% on a Raspberry Pi 3 (from 28.1x to 33.5x realtime) Deemphasis SIMD based on the following unrolling: const float c1 = CELT_EMPH_COEFF, c2 = c1c1, c3 = c2c1, c4 = c3c1; float state = coeff; for (int i = 0; i < len; i += 4) { y[0] = x[0] + c1state; y[1] = x[1] + c2state + c1x[0]; y[2] = x[2] + c3state + c1x[1] + c2x[0]; y[3] = x[3] + c4state + c1x[2] + c2x[1] + c3*x[0]; state = y[3]; y += 4; x += 4; } Unlike the x86 version, duplication is used instead of pslldq so the structure and tables are different.	6 years ago
Lynne	605e330310	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 = c1c1, c3 = c2c1, c4 = c3c1; float state = coeff; for (int i = 0; i < len; i += 4) { y[0] = x[0] + c1state; y[1] = x[1] + c2state + c1x[0]; y[2] = x[2] + c3state + c1x[1] + c2x[0]; y[3] = x[3] + c4state + c1x[2] + c2x[1] + c3*x[0]; state = y[3]; y += 4; x += 4; }	6 years ago
Lynne	0cea3ca894	opusdsp: create and move deemphasis and postfiltering from opus_celt	6 years ago