5 commits

Author	SHA1	Message	Date
Anton Khirnov	3f9ca51015	lavc/opus*: move to opus/ subdir	2024-09-02 11:56:53 +02:00
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
Andreas Rheinhardt	f3c197b129	Include attributes.h directly ... Some files currently rely on libavutil/cpu.h to include it for them; yet said file won't use include it any more after the currently deprecated functions are removed, so include attributes.h directly. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>	2021-04-19 14:34:10 +02:00
James Almer	1faedb9a11	x85/opusdsp: enable the functions on all FMA3 CPUs ... It's not using ymm registers, so limiting it to CPUs with fast AVX is not necessary. Signed-off-by: James Almer <jamrial@gmail.com>	2019-09-11 20:50:45 -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