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Commit Graph

4 Commits (2248217d42a30d9094ee721eb4bc12e9ac9853da)

Author	SHA1	Message	Date
Clément Bœsch	e4a27e2f2d	lavc/arm: fix lack of precision in ff_ps_stereo_interpolate_neon ... The code originally pre-multiply by 2 the steps, causing the running sum of the h factors to drift away due to the lack of precision. It quickly causes an inaccuracy > 0.01. I tried diverse approaches such as multiply by 2.0 (instead of adding the value itself) without success. I'm unable to bench the impact of this change, feel free to compare. This commit fixes the incoming aacpsdsp tests. Following is an alternative simplified function (matching the incoming AArch64 code) that may be used: function ff_ps_stereo_interpolate_neon, export=1 vld1.32 {q0}, [r2] vld1.32 {q1}, [r3] ldr r12, [sp] vmov.f32 q8, q0 vmov.f32 q9, q1 vzip.32 q8, q0 vzip.32 q9, q1 1: vld1.32 {d4}, [r0,:64] vld1.32 {d6}, [r1,:64] vadd.f32 q8, q8, q9 vadd.f32 q0, q0, q1 vmov.f32 d5, d4 vmov.f32 d7, d6 vmul.f32 q2, q2, q8 vmla.f32 q2, q3, q0 vst1.32 {d4}, [r0,:64]! vst1.32 {d5}, [r1,:64]! subs r12, r12, #1 bgt 1b bx lr endfunc	8 years ago
Thilo Borgmann	d814a839ac	Reinstate proper FFmpeg license for all files.	12 years ago
Justin Ruggles	94d2b0d2fd	ARM: Move asm.S from libavcodec to libavutil ... This will allow for easier implementation of ARM-optimized functions in libraries other than libavcodec.	13 years ago
Mans Rullgard	96f7590efd	aacps: NEON optimisations ... Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago