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FFmpeg/libswresample

History

Ganesh Ajjanagadde c8780822ba swresample/resample: speed up build_filter for Blackman-Nuttall filter ... This uses the trigonometric double and triple angle formulae to avoid repeated (expensive) evaluation of libc's cos(). Sample benchmark (x86-64, Haswell, GNU/Linux) test: fate-swr-resample-dblp-44100-2626 old: 1104466600 decicycles in build_filter(loop 1000), 256 runs, 0 skips 1096765286 decicycles in build_filter(loop 1000), 512 runs, 0 skips 1070479590 decicycles in build_filter(loop 1000), 1024 runs, 0 skips new: 588861423 decicycles in build_filter(loop 1000), 256 runs, 0 skips 591262754 decicycles in build_filter(loop 1000), 512 runs, 0 skips 577355145 decicycles in build_filter(loop 1000), 1024 runs, 0 skips This results in small differences with the old expression: difference (worst case on [0, 2*M_PI]), argmax 0.008: max diff (relative): 0.000000000000157289807188 blackman_old(0.008): 0.000363951585488813192382 blackman_new(0.008): 0.000363951585488755946507 These are judged to be insignificant for the performance gain. PSNR to reference file is unchanged up to second decimal point for instance. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>		9 years ago
..
aarch64	swr: aarch64 audio_convert and neon clobber test	10 years ago
arm	Fix libswresample compilation with Apple Neon assembler.	11 years ago
x86	x86/audio_convert: fix clobbering of xmm registers	9 years ago
Makefile	swresample: Add AVFrame based API	10 years ago
audioconvert.c	swresample/audioconvert: Fix undefined behavior (left shift of negative value)	10 years ago
audioconvert.h	audioconvert: support simd code with specific alignment requirements.	12 years ago
dither.c	swresample/dither: use integer arithmetic	9 years ago
dither_template.c	swresample/dither_template: Add missing license header	9 years ago
libswresample.v	swresample/libswresample.v: hide ff_*	10 years ago
log2_tab.c	…
noise_shaping_data.c	swr/noise_shaping_data: pad coeffs to multiple of 4 when they are 1 below	12 years ago
options.c	swr: do not reject channel layouts that use channel 63	9 years ago
rematrix.c	swresample: slightly nicer debug output for auto matrix	9 years ago
rematrix_template.c	swresample/rematrix_template: Fix integer overflow in mix8to2	12 years ago
resample.c	swresample/resample: speed up build_filter for Blackman-Nuttall filter	9 years ago
resample.h	swr: initialize only the necessary resample dsp functions	11 years ago
resample_dsp.c	swr: initialize only the necessary resample dsp functions	11 years ago
resample_template.c	swr/resample: use av_clip functions	10 years ago
soxr_resample.c	swresample: soxr implementation for swr_get_out_samples()	10 years ago
swresample-test.c	all: add const-correctness to qsort comparators	9 years ago
swresample.c	swresample/swresample: Fix integer overflow in seed calculation	9 years ago
swresample.h	doc/resampler, swresample/options: use proper capitalization	9 years ago
swresample_frame.c	swresample: Add AVFrame based API	10 years ago
swresample_internal.h	swresample/swresample_internal: add av_warn_unused_result	9 years ago
swresampleres.rc	Add Windows resource file support for shared libraries	11 years ago
version.h	Merge commit 'e88103a7f92cf27a2868b50acc8a9912f6088249'	9 years ago