From b8c6e5a6618337a82ea9d0bafb471eeecc51b919 Mon Sep 17 00:00:00 2001 From: Muhammad Faiz Date: Sun, 12 Jun 2016 05:19:20 +0700 Subject: swresample: add exact_rational option give high quality resampling as good as with linear_interp=on as fast as without linear_interp=on tested visually with ffplay ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000, showcqt=gamma=5" ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:linear_interp=on, showcqt=gamma=5" ffplay -f lavfi "aevalsrc='sin(10000*t*t)', aresample=osr=48000:exact_rational=on, showcqt=gamma=5" slightly speed improvement for fair comparison with -cpuflags 0 audio.wav is ~ 1 hour 44100 stereo 16bit wav file ffmpeg -i audio.wav -af aresample=osr=48000 -f null - old new real 13.498s 13.121s user 13.364s 12.987s sys 0.131s 0.129s linear_interp=on old new real 23.035s 23.050s user 22.907s 22.917s sys 0.119s 0.125s exact_rational=on real 12.418s user 12.298s sys 0.114s possibility to decrease memory usage if soft compensation is ignored Signed-off-by: Muhammad Faiz --- libswresample/x86/resample_init.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'libswresample/x86/resample_init.c') diff --git a/libswresample/x86/resample_init.c b/libswresample/x86/resample_init.c index 9d7d5cf89e..f05397fecb 100644 --- a/libswresample/x86/resample_init.c +++ b/libswresample/x86/resample_init.c @@ -47,6 +47,10 @@ av_cold void swri_resample_dsp_x86_init(ResampleContext *c) { int av_unused mm_flags = av_get_cpu_flags(); + /* FIXME use phase_count on asm */ + if (c->phase_count != 1 << c->phase_shift) + return; + switch(c->format){ case AV_SAMPLE_FMT_S16P: if (ARCH_X86_32 && EXTERNAL_MMXEXT(mm_flags)) { -- cgit v1.2.3