5 commits

Author	SHA1	Message	Date
Lynne	134dba9544	opusdsp: add ability to modify deemphasis constant ... xHE-AAC relies on the same postfilter mechanism that Opus uses to improve clarity (albeit with a steeper deemphasis filter). The code to apply it is identical, it's still just a simple IIR low-pass filter. This commit makes it possible to use alternative constants.	2024-04-27 11:12:07 +02:00
James Almer	80444e23ac	x86/opusdps: clear the high bits from some gprs ... Fixes checkasm on systems like win64. Reviewed-by: Lynne Signed-off-by: James Almer <jamrial@gmail.com>	2019-09-11 20:42:31 -03:00
Lynne	4b7166c9d5	x86/opusdsp: replace loads with shuffles ... Has a slight speedup. Can't be carried over to aarch64, since it has no shufps-like instruction. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>	2019-04-26 20:39:38 -03:00
Lynne	b43b8d337d	x86/opusdsp: fix WIN64 return value ... Signed-off-by: James Almer <jamrial@gmail.com>	2019-04-01 11:06:34 -03:00
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 = 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; }	2019-04-01 00:22:00 +02:00