mirror of https://git.ffmpeg.org/ffmpeg.git
Move bessel_i0() from swresample/resample to avutil/mathematics
0th order modified bessel function of the first kind are used in multiple places, lets avoid having 3+ different implementations I picked this one as its accurate and quite fast, it can be replaced if a better one is found Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
parent
0c78b0dd3b
commit
75918016ab
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@ -2,6 +2,9 @@ The last version increases of all libraries were on 2023-02-09
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API changes, most recent first:
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2023-05-29 - xxxxxxxxxx - lavu 58.12.100 - mathematics.h
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Add av_bessel_i0()
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2023-05-xx - xxxxxxxxxx - lavc 60.15.100 - avcodec.h
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Add AVHWAccel.update_thread_context, AVHWAccel.free_frame_priv,
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AVHWAccel.flush.
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@ -213,3 +213,107 @@ int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t i
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return av_sat_add64(av_rescale_q(old + 1, inc_tb, ts_tb), ts - old_ts);
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}
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}
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static inline double eval_poly(const double *coeff, int size, double x) {
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double sum = coeff[size-1];
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int i;
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for (i = size-2; i >= 0; --i) {
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sum *= x;
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sum += coeff[i];
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}
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return sum;
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}
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/**
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* 0th order modified bessel function of the first kind.
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* Algorithm taken from the Boost project, source:
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* https://searchcode.com/codesearch/view/14918379/
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0 (see notice below).
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* Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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double av_bessel_i0(double x) {
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// Modified Bessel function of the first kind of order zero
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// minimax rational approximations on intervals, see
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// Blair and Edwards, Chalk River Report AECL-4928, 1974
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static const double p1[] = {
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-2.2335582639474375249e+15,
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-5.5050369673018427753e+14,
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-3.2940087627407749166e+13,
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-8.4925101247114157499e+11,
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-1.1912746104985237192e+10,
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-1.0313066708737980747e+08,
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-5.9545626019847898221e+05,
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-2.4125195876041896775e+03,
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-7.0935347449210549190e+00,
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-1.5453977791786851041e-02,
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-2.5172644670688975051e-05,
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-3.0517226450451067446e-08,
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-2.6843448573468483278e-11,
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-1.5982226675653184646e-14,
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-5.2487866627945699800e-18,
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};
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static const double q1[] = {
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-2.2335582639474375245e+15,
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7.8858692566751002988e+12,
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-1.2207067397808979846e+10,
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1.0377081058062166144e+07,
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-4.8527560179962773045e+03,
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1.0,
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};
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static const double p2[] = {
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-2.2210262233306573296e-04,
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1.3067392038106924055e-02,
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-4.4700805721174453923e-01,
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5.5674518371240761397e+00,
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-2.3517945679239481621e+01,
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3.1611322818701131207e+01,
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-9.6090021968656180000e+00,
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};
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static const double q2[] = {
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-5.5194330231005480228e-04,
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3.2547697594819615062e-02,
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-1.1151759188741312645e+00,
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1.3982595353892851542e+01,
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-6.0228002066743340583e+01,
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8.5539563258012929600e+01,
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-3.1446690275135491500e+01,
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1.0,
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};
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double y, r, factor;
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if (x == 0)
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return 1.0;
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x = fabs(x);
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if (x <= 15) {
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y = x * x;
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return eval_poly(p1, FF_ARRAY_ELEMS(p1), y) / eval_poly(q1, FF_ARRAY_ELEMS(q1), y);
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}
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else {
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y = 1 / x - 1.0 / 15;
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r = eval_poly(p2, FF_ARRAY_ELEMS(p2), y) / eval_poly(q2, FF_ARRAY_ELEMS(q2), y);
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factor = exp(x) / sqrt(x);
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return factor * r;
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}
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}
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@ -288,6 +288,10 @@ int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts, AVRational fs_tb, int
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*/
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int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc);
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/**
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* 0th order modified bessel function of the first kind.
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*/
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double av_bessel_i0(double x);
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/**
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* @}
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@ -79,7 +79,7 @@
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*/
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#define LIBAVUTIL_VERSION_MAJOR 58
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#define LIBAVUTIL_VERSION_MINOR 11
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#define LIBAVUTIL_VERSION_MINOR 12
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#define LIBAVUTIL_VERSION_MICRO 100
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#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
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@ -30,110 +30,6 @@
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#include "libavutil/cpu.h"
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#include "resample.h"
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static inline double eval_poly(const double *coeff, int size, double x) {
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double sum = coeff[size-1];
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int i;
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for (i = size-2; i >= 0; --i) {
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sum *= x;
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sum += coeff[i];
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}
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return sum;
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}
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/**
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* 0th order modified bessel function of the first kind.
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* Algorithm taken from the Boost project, source:
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* https://searchcode.com/codesearch/view/14918379/
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0 (see notice below).
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* Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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static double bessel(double x) {
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// Modified Bessel function of the first kind of order zero
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// minimax rational approximations on intervals, see
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// Blair and Edwards, Chalk River Report AECL-4928, 1974
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static const double p1[] = {
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-2.2335582639474375249e+15,
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-5.5050369673018427753e+14,
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-3.2940087627407749166e+13,
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-8.4925101247114157499e+11,
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-1.1912746104985237192e+10,
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-1.0313066708737980747e+08,
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-5.9545626019847898221e+05,
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-2.4125195876041896775e+03,
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-7.0935347449210549190e+00,
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-1.5453977791786851041e-02,
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-2.5172644670688975051e-05,
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-3.0517226450451067446e-08,
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-2.6843448573468483278e-11,
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-1.5982226675653184646e-14,
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-5.2487866627945699800e-18,
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};
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static const double q1[] = {
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-2.2335582639474375245e+15,
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7.8858692566751002988e+12,
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-1.2207067397808979846e+10,
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1.0377081058062166144e+07,
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-4.8527560179962773045e+03,
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1.0,
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};
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static const double p2[] = {
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-2.2210262233306573296e-04,
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1.3067392038106924055e-02,
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-4.4700805721174453923e-01,
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5.5674518371240761397e+00,
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-2.3517945679239481621e+01,
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3.1611322818701131207e+01,
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-9.6090021968656180000e+00,
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};
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static const double q2[] = {
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-5.5194330231005480228e-04,
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3.2547697594819615062e-02,
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-1.1151759188741312645e+00,
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1.3982595353892851542e+01,
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-6.0228002066743340583e+01,
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8.5539563258012929600e+01,
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-3.1446690275135491500e+01,
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1.0,
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};
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double y, r, factor;
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if (x == 0)
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return 1.0;
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x = fabs(x);
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if (x <= 15) {
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y = x * x;
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return eval_poly(p1, FF_ARRAY_ELEMS(p1), y) / eval_poly(q1, FF_ARRAY_ELEMS(q1), y);
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}
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else {
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y = 1 / x - 1.0 / 15;
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r = eval_poly(p2, FF_ARRAY_ELEMS(p2), y) / eval_poly(q2, FF_ARRAY_ELEMS(q2), y);
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factor = exp(x) / sqrt(x);
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return factor * r;
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}
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}
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/**
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* builds a polyphase filterbank.
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* @param factor resampling factor
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@ -189,7 +85,7 @@ static int build_filter(ResampleContext *c, void *filter, double factor, int tap
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break;
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case SWR_FILTER_TYPE_KAISER:
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w = 2.0*x / (factor*tap_count*M_PI);
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y *= bessel(kaiser_beta*sqrt(FFMAX(1-w*w, 0)));
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y *= av_bessel_i0(kaiser_beta*sqrt(FFMAX(1-w*w, 0)));
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break;
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default:
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av_assert0(0);
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