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audio: Prebake the resampler's kaiser table instead of doing it at runtime.

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This commit is contained in:
Ryan C. Gordon 2022-04-09 23:43:57 -04:00
parent f6eb4b0759
commit de019568dc
5 changed files with 1054 additions and 110 deletions
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162
build-scripts/gen_audio_resampler_filter.c Normal file
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@ -0,0 +1,162 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/*
Built with:
gcc -o genfilter build-scripts/gen_audio_resampler_filter.c -lm && ./genfilter > src/audio/SDL_audio_resampler_filter.h
*/
/*
SDL's resampler uses a "bandlimited interpolation" algorithm:
https://ccrma.stanford.edu/~jos/resample/
This code pre-generates the kaiser tables so we don't have to do this at
run time, at a cost of about 20 kilobytes of static data in SDL. This code
used to be part of SDL itself and generated the tables on the first use,
but that was expensive to produce on platforms without floating point
hardware.
*/
#include <stdio.h>
#include <math.h>
#define RESAMPLER_ZERO_CROSSINGS 5
#define RESAMPLER_BITS_PER_SAMPLE 16
#define RESAMPLER_SAMPLES_PER_ZERO_CROSSING (1 << ((RESAMPLER_BITS_PER_SAMPLE / 2) + 1))
#define RESAMPLER_FILTER_SIZE ((RESAMPLER_SAMPLES_PER_ZERO_CROSSING * RESAMPLER_ZERO_CROSSINGS) + 1)
/* This is a "modified" bessel function, so you can't use POSIX j0() */
static double
bessel(const double x)
{
const double xdiv2 = x / 2.0;
double i0 = 1.0f;
double f = 1.0f;
int i = 1;
while (1) {
const double diff = pow(xdiv2, i * 2) / pow(f, 2);
if (diff < 1.0e-21f) {
break;
}
i0 += diff;
i++;
f *= (double) i;
}
return i0;
}
/* build kaiser table with cardinal sine applied to it, and array of differences between elements. */
static void
kaiser_and_sinc(float *table, float *diffs, const int tablelen, const double beta)
{
const int lenm1 = tablelen - 1;
const int lenm1div2 = lenm1 / 2;
int i;
table[0] = 1.0f;
for (i = 1; i < tablelen; i++) {
const double kaiser = bessel(beta * sqrt(1.0 - pow(((i - lenm1) / 2.0) / lenm1div2, 2.0))) / bessel(beta);
table[tablelen - i] = (float) kaiser;
}
for (i = 1; i < tablelen; i++) {
const float x = (((float) i) / ((float) RESAMPLER_SAMPLES_PER_ZERO_CROSSING)) * ((float) M_PI);
table[i] *= sinf(x) / x;
diffs[i - 1] = table[i] - table[i - 1];
}
diffs[lenm1] = 0.0f;
}
static float ResamplerFilter[RESAMPLER_FILTER_SIZE];
static float ResamplerFilterDifference[RESAMPLER_FILTER_SIZE];
static void
PrepareResampleFilter(void)
{
/* if dB > 50, beta=(0.1102 * (dB - 8.7)), according to Matlab. */
const double dB = 80.0;
const double beta = 0.1102 * (dB - 8.7);
kaiser_and_sinc(ResamplerFilter, ResamplerFilterDifference, RESAMPLER_FILTER_SIZE, beta);
}
int main(void)
{
int i;
PrepareResampleFilter();
printf(
"/*\n"
" Simple DirectMedia Layer\n"
" Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>\n"
"\n"
" This software is provided 'as-is', without any express or implied\n"
" warranty. In no event will the authors be held liable for any damages\n"
" arising from the use of this software.\n"
"\n"
" Permission is granted to anyone to use this software for any purpose,\n"
" including commercial applications, and to alter it and redistribute it\n"
" freely, subject to the following restrictions:\n"
"\n"
" 1. The origin of this software must not be misrepresented; you must not\n"
" claim that you wrote the original software. If you use this software\n"
" in a product, an acknowledgment in the product documentation would be\n"
" appreciated but is not required.\n"
" 2. Altered source versions must be plainly marked as such, and must not be\n"
" misrepresented as being the original software.\n"
" 3. This notice may not be removed or altered from any source distribution.\n"
"*/\n"
"\n"
"/* DO NOT EDIT, THIS FILE WAS GENERATED BY build-scripts/gen_audio_resampler_filter.c */\n"
"\n"
"#define RESAMPLER_ZERO_CROSSINGS %d\n"
"#define RESAMPLER_BITS_PER_SAMPLE %d\n"
"#define RESAMPLER_SAMPLES_PER_ZERO_CROSSING (1 << ((RESAMPLER_BITS_PER_SAMPLE / 2) + 1))\n"
"#define RESAMPLER_FILTER_SIZE ((RESAMPLER_SAMPLES_PER_ZERO_CROSSING * RESAMPLER_ZERO_CROSSINGS) + 1)\n"
"\n", RESAMPLER_ZERO_CROSSINGS, RESAMPLER_BITS_PER_SAMPLE
);
printf("static const float ResamplerFilter[RESAMPLER_FILTER_SIZE] = {\n");
printf(" %ff", ResamplerFilter[0]);
for (i = 0; i < RESAMPLER_FILTER_SIZE-1; i++) {
printf("%s%ff", ((i % 6) == 5) ? ",\n " : ", ", ResamplerFilter[i+1]);
}
printf("\n};\n\n");
printf("static const float ResamplerFilterDifference[RESAMPLER_FILTER_SIZE] = {\n");
printf(" %ff", ResamplerFilterDifference[0]);
for (i = 0; i < RESAMPLER_FILTER_SIZE-1; i++) {
printf("%s%ff", ((i % 6) == 5) ? ",\n " : ", ", ResamplerFilterDifference[i+1]);
}
printf("\n};\n\n");
printf("/* vi: set ts=4 sw=4 expandtab: */\n\n");
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */

2
src/audio/SDL_audio.c
View File

@ -1649,8 +1649,6 @@ SDL_AudioQuit(void)
#ifdef HAVE_LIBSAMPLERATE_H
UnloadLibSampleRate();
#endif
SDL_FreeResampleFilter();
}
#define NUM_FORMATS 10

5
src/audio/SDL_audio_c.h
View File

@ -70,11 +70,6 @@ extern SDL_AudioFilter SDL_Convert_F32_to_S16;
extern SDL_AudioFilter SDL_Convert_F32_to_U16;
extern SDL_AudioFilter SDL_Convert_F32_to_S32;
/* You need to call SDL_PrepareResampleFilter() before using the internal resampler.
SDL_AudioQuit() calls SDL_FreeResamplerFilter(), you should never call it yourself. */
extern int SDL_PrepareResampleFilter(void);
extern void SDL_FreeResampleFilter(void);
#endif /* SDL_audio_c_h_ */
/* vi: set ts=4 sw=4 expandtab: */

890
src/audio/SDL_audio_resampler_filter.h Normal file
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@ -0,0 +1,890 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/* DO NOT EDIT, THIS FILE WAS GENERATED BY build-scripts/gen_audio_resampler_filter.c */
#define RESAMPLER_ZERO_CROSSINGS 5
#define RESAMPLER_BITS_PER_SAMPLE 16
#define RESAMPLER_SAMPLES_PER_ZERO_CROSSING (1 << ((RESAMPLER_BITS_PER_SAMPLE / 2) + 1))
#define RESAMPLER_FILTER_SIZE ((RESAMPLER_SAMPLES_PER_ZERO_CROSSING * RESAMPLER_ZERO_CROSSINGS) + 1)
static const float ResamplerFilter[RESAMPLER_FILTER_SIZE] = {
1.000000f, 0.999994f, 0.999974f, 0.999941f, 0.999895f, 0.999834f,
0.999760f, 0.999672f, 0.999571f, 0.999456f, 0.999327f, 0.999185f,
0.999029f, 0.998859f, 0.998676f, 0.998479f, 0.998269f, 0.998044f,
0.997807f, 0.997555f, 0.997290f, 0.997012f, 0.996720f, 0.996414f,
0.996094f, 0.995762f, 0.995415f, 0.995055f, 0.994682f, 0.994295f,
0.993894f, 0.993480f, 0.993052f, 0.992611f, 0.992157f, 0.991689f,
0.991207f, 0.990713f, 0.990204f, 0.989683f, 0.989148f, 0.988599f,
0.988037f, 0.987462f, 0.986874f, 0.986272f, 0.985657f, 0.985028f,
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0.980259f, 0.979525f, 0.978778f, 0.978018f, 0.977245f, 0.976458f,
0.975659f, 0.974847f, 0.974021f, 0.973183f, 0.972332f, 0.971468f,
0.970591f, 0.969701f, 0.968798f, 0.967882f, 0.966954f, 0.966013f,
0.965059f, 0.964092f, 0.963113f, 0.962120f, 0.961116f, 0.960098f,
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0.952626f, 0.951509f, 0.950379f, 0.949237f, 0.948083f, 0.946917f,
0.945738f, 0.944547f, 0.943344f, 0.942128f, 0.940901f, 0.939661f,
0.938410f, 0.937146f, 0.935871f, 0.934583f, 0.933284f, 0.931973f,
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-0.010148f, -0.010102f, -0.010055f, -0.010008f, -0.009961f, -0.009913f,
-0.009866f, -0.009818f, -0.009770f, -0.009722f, -0.009673f, -0.009625f,
-0.009576f, -0.009527f, -0.009478f, -0.009429f, -0.009380f, -0.009330f,
-0.009281f, -0.009231f, -0.009181f, -0.009131f, -0.009081f, -0.009030f,
-0.008980f, -0.008929f, -0.008879f, -0.008828f, -0.008777f, -0.008726f,
-0.008675f, -0.008624f, -0.008572f, -0.008521f, -0.008469f, -0.008418f,
-0.008366f, -0.008314f, -0.008263f, -0.008211f, -0.008159f, -0.008107f,
-0.008055f, -0.008002f, -0.007950f, -0.007898f, -0.007845f, -0.007793f,
-0.007741f, -0.007688f, -0.007636f, -0.007583f, -0.007531f, -0.007478f,
-0.007425f, -0.007373f, -0.007320f, -0.007267f, -0.007215f, -0.007162f,
-0.007109f, -0.007056f, -0.007004f, -0.006951f, -0.006898f, -0.006846f,
-0.006793f, -0.006740f, -0.006687f, -0.006635f, -0.006582f, -0.006530f,
-0.006477f, -0.006424f, -0.006372f, -0.006319f, -0.006267f, -0.006214f,
-0.006162f, -0.006110f, -0.006057f, -0.006005f, -0.005953f, -0.005901f,
-0.005849f, -0.005797f, -0.005745f, -0.005693f, -0.005641f, -0.005590f,
-0.005538f, -0.005486f, -0.005435f, -0.005383f, -0.005332f, -0.005281f,
-0.005230f, -0.005178f, -0.005127f, -0.005077f, -0.005026f, -0.004975f,
-0.004924f, -0.004874f, -0.004824f, -0.004773f, -0.004723f, -0.004673f,
-0.004623f, -0.004573f, -0.004523f, -0.004474f, -0.004424f, -0.004375f,
-0.004326f, -0.004277f, -0.004228f, -0.004179f, -0.004130f, -0.004082f,
-0.004033f, -0.003985f, -0.003937f, -0.003889f, -0.003841f, -0.003793f,
-0.003745f, -0.003698f, -0.003651f, -0.003604f, -0.003557f, -0.003510f,
-0.003463f, -0.003417f, -0.003370f, -0.003324f, -0.003278f, -0.003232f,
-0.003187f, -0.003141f, -0.003096f, -0.003051f, -0.003006f, -0.002961f,
-0.002916f, -0.002872f, -0.002827f, -0.002783f, -0.002739f, -0.002696f,
-0.002652f, -0.002609f, -0.002565f, -0.002522f, -0.002479f, -0.002437f,
-0.002394f, -0.002352f, -0.002310f, -0.002268f, -0.002227f, -0.002185f,
-0.002144f, -0.002103f, -0.002062f, -0.002021f, -0.001981f, -0.001940f,
-0.001900f, -0.001860f, -0.001821f, -0.001781f, -0.001742f, -0.001703f,
-0.001664f, -0.001625f, -0.001587f, -0.001549f, -0.001511f, -0.001473f,
-0.001435f, -0.001398f, -0.001361f, -0.001324f, -0.001287f, -0.001251f,
-0.001214f, -0.001178f, -0.001143f, -0.001107f, -0.001071f, -0.001036f,
-0.001001f, -0.000967f, -0.000932f, -0.000898f, -0.000864f, -0.000830f,
-0.000796f, -0.000763f, -0.000729f, -0.000696f, -0.000664f, -0.000631f,
-0.000599f, -0.000567f, -0.000535f, -0.000503f, -0.000472f, -0.000441f,
-0.000410f, -0.000379f, -0.000348f, -0.000318f, -0.000288f, -0.000258f,
-0.000229f, -0.000199f, -0.000170f, -0.000141f, -0.000112f, -0.000084f,
-0.000056f, -0.000028f, 0.000000f, 0.000028f, 0.000055f, 0.000082f,
0.000109f, 0.000136f, 0.000162f, 0.000188f, 0.000214f, 0.000240f,
0.000265f, 0.000291f, 0.000316f, 0.000340f, 0.000365f, 0.000389f,
0.000414f, 0.000438f, 0.000461f, 0.000485f, 0.000508f, 0.000531f,
0.000554f, 0.000576f, 0.000599f, 0.000621f, 0.000643f, 0.000664f,
0.000686f, 0.000707f, 0.000728f, 0.000749f, 0.000770f, 0.000790f,
0.000810f, 0.000830f, 0.000850f, 0.000869f, 0.000888f, 0.000907f,
0.000926f, 0.000945f, 0.000963f, 0.000981f, 0.000999f, 0.001017f,
0.001035f, 0.001052f, 0.001069f, 0.001086f, 0.001103f, 0.001119f,
0.001135f, 0.001151f, 0.001167f, 0.001183f, 0.001198f, 0.001214f,
0.001229f, 0.001243f, 0.001258f, 0.001272f, 0.001287f, 0.001301f,
0.001314f, 0.001328f, 0.001341f, 0.001355f, 0.001367f, 0.001380f,
0.001393f, 0.001405f, 0.001417f, 0.001429f, 0.001441f, 0.001453f,
0.001464f, 0.001475f, 0.001486f, 0.001497f, 0.001508f, 0.001518f,
0.001529f, 0.001539f, 0.001549f, 0.001558f, 0.001568f, 0.001577f,
0.001586f, 0.001595f, 0.001604f, 0.001613f, 0.001621f, 0.001629f,
0.001637f, 0.001645f, 0.001653f, 0.001660f, 0.001668f, 0.001675f,
0.001682f, 0.001689f, 0.001696f, 0.001702f, 0.001708f, 0.001715f,
0.001721f, 0.001726f, 0.001732f, 0.001738f, 0.001743f, 0.001748f,
0.001753f, 0.001758f, 0.001763f, 0.001767f, 0.001772f, 0.001776f,
0.001780f, 0.001784f, 0.001788f, 0.001791f, 0.001795f, 0.001798f,
0.001801f, 0.001804f, 0.001807f, 0.001810f, 0.001812f, 0.001815f,
0.001817f, 0.001819f, 0.001821f, 0.001823f, 0.001825f, 0.001826f,
0.001828f, 0.001829f, 0.001830f, 0.001831f, 0.001832f, 0.001833f,
0.001834f, 0.001834f, 0.001835f, 0.001835f, 0.001835f, 0.001835f,
0.001835f, 0.001835f, 0.001834f, 0.001834f, 0.001833f, 0.001833f,
0.001832f, 0.001831f, 0.001830f, 0.001829f, 0.001827f, 0.001826f,
0.001824f, 0.001823f, 0.001821f, 0.001819f, 0.001817f, 0.001815f,
0.001813f, 0.001811f, 0.001808f, 0.001806f, 0.001803f, 0.001801f,
0.001798f, 0.001795f, 0.001792f, 0.001789f, 0.001786f, 0.001783f,
0.001779f, 0.001776f, 0.001772f, 0.001769f, 0.001765f, 0.001761f,
0.001757f, 0.001753f, 0.001749f, 0.001745f, 0.001741f, 0.001737f,
0.001732f, 0.001728f, 0.001724f, 0.001719f, 0.001714f, 0.001710f,
0.001705f, 0.001700f, 0.001695f, 0.001690f, 0.001685f, 0.001680f,
0.001674f, 0.001669f, 0.001664f, 0.001658f, 0.001653f, 0.001647f,
0.001641f, 0.001636f, 0.001630f, 0.001624f, 0.001618f, 0.001612f,
0.001606f, 0.001600f, 0.001594f, 0.001588f, 0.001582f, 0.001576f,
0.001569f, 0.001563f, 0.001557f, 0.001550f, 0.001544f, 0.001537f,
0.001531f, 0.001524f, 0.001517f, 0.001511f, 0.001504f, 0.001497f,
0.001490f, 0.001483f, 0.001477f, 0.001470f, 0.001463f, 0.001456f,
0.001449f, 0.001441f, 0.001434f, 0.001427f, 0.001420f, 0.001413f,
0.001406f, 0.001398f, 0.001391f, 0.001384f, 0.001376f, 0.001369f,
0.001362f, 0.001354f, 0.001347f, 0.001339f, 0.001332f, 0.001324f,
0.001317f, 0.001309f, 0.001301f, 0.001294f, 0.001286f, 0.001279f,
0.001271f, 0.001263f, 0.001256f, 0.001248f, 0.001240f, 0.001233f,
0.001225f, 0.001217f, 0.001209f, 0.001202f, 0.001194f, 0.001186f,
0.001178f, 0.001171f, 0.001163f, 0.001155f, 0.001147f, 0.001140f,
0.001132f, 0.001124f, 0.001116f, 0.001108f, 0.001101f, 0.001093f,
0.001085f, 0.001077f, 0.001069f, 0.001062f, 0.001054f, 0.001046f,
0.001038f, 0.001031f, 0.001023f, 0.001015f, 0.001007f, 0.001000f,
0.000992f, 0.000984f, 0.000976f, 0.000969f, 0.000961f, 0.000953f,
0.000946f, 0.000938f, 0.000930f, 0.000923f, 0.000915f, 0.000907f,
0.000900f, 0.000892f, 0.000885f, 0.000877f, 0.000870f, 0.000862f,
0.000855f, 0.000847f, 0.000840f, 0.000832f, 0.000825f, 0.000817f,
0.000810f, 0.000803f, 0.000795f, 0.000788f, 0.000781f, 0.000773f,
0.000766f, 0.000759f, 0.000752f, 0.000744f, 0.000737f, 0.000730f,
0.000723f, 0.000716f, 0.000709f, 0.000702f, 0.000695f, 0.000688f,
0.000681f, 0.000674f, 0.000667f, 0.000660f, 0.000653f, 0.000646f,
0.000640f, 0.000633f, 0.000626f, 0.000619f, 0.000613f, 0.000606f,
0.000599f, 0.000593f, 0.000586f, 0.000580f, 0.000573f, 0.000567f,
0.000560f, 0.000554f, 0.000548f, 0.000541f, 0.000535f, 0.000529f,
0.000522f, 0.000516f, 0.000510f, 0.000504f, 0.000498f, 0.000492f,
0.000486f, 0.000480f, 0.000474f, 0.000468f, 0.000462f, 0.000456f,
0.000450f, 0.000444f, 0.000439f, 0.000433f, 0.000427f, 0.000422f,
0.000416f, 0.000410f, 0.000405f, 0.000399f, 0.000394f, 0.000389f,
0.000383f, 0.000378f, 0.000373f, 0.000367f, 0.000362f, 0.000357f,
0.000352f, 0.000347f, 0.000341f, 0.000336f, 0.000331f, 0.000326f,
0.000321f, 0.000317f, 0.000312f, 0.000307f, 0.000302f, 0.000297f,
0.000293f, 0.000288f, 0.000283f, 0.000279f, 0.000274f, 0.000270f,
0.000265f, 0.000261f, 0.000256f, 0.000252f, 0.000248f, 0.000243f,
0.000239f, 0.000235f, 0.000231f, 0.000227f, 0.000223f, 0.000218f,
0.000214f, 0.000210f, 0.000207f, 0.000203f, 0.000199f, 0.000195f,
0.000191f, 0.000187f, 0.000184f, 0.000180f, 0.000176f, 0.000173f,
0.000169f, 0.000166f, 0.000162f, 0.000159f, 0.000155f, 0.000152f,
0.000149f, 0.000145f, 0.000142f, 0.000139f, 0.000136f, 0.000132f,
0.000129f, 0.000126f, 0.000123f, 0.000120f, 0.000117f, 0.000114f,
0.000111f, 0.000109f, 0.000106f, 0.000103f, 0.000100f, 0.000097f,
0.000095f, 0.000092f, 0.000090f, 0.000087f, 0.000084f, 0.000082f,
0.000079f, 0.000077f, 0.000075f, 0.000072f, 0.000070f, 0.000068f,
0.000065f, 0.000063f, 0.000061f, 0.000059f, 0.000057f, 0.000054f,
0.000052f, 0.000050f, 0.000048f, 0.000046f, 0.000044f, 0.000042f,
0.000041f, 0.000039f, 0.000037f, 0.000035f, 0.000033f, 0.000032f,
0.000030f, 0.000028f, 0.000027f, 0.000025f, 0.000023f, 0.000022f,
0.000020f, 0.000019f, 0.000017f, 0.000016f, 0.000015f, 0.000013f,
0.000012f, 0.000011f, 0.000009f, 0.000008f, 0.000007f, 0.000006f,
0.000004f, 0.000003f, 0.000002f, 0.000001f, -0.000000f
};
static const float ResamplerFilterDifference[RESAMPLER_FILTER_SIZE] = {
-0.000006f, -0.000019f, -0.000033f, -0.000047f, -0.000060f, -0.000074f,
-0.000088f, -0.000101f, -0.000115f, -0.000129f, -0.000142f, -0.000156f,
-0.000170f, -0.000183f, -0.000197f, -0.000211f, -0.000224f, -0.000238f,
-0.000251f, -0.000265f, -0.000279f, -0.000292f, -0.000306f, -0.000319f,
-0.000333f, -0.000346f, -0.000360f, -0.000374f, -0.000387f, -0.000401f,
-0.000414f, -0.000428f, -0.000441f, -0.000454f, -0.000468f, -0.000481f,
-0.000495f, -0.000508f, -0.000522f, -0.000535f, -0.000548f, -0.000562f,
-0.000575f, -0.000589f, -0.000602f, -0.000615f, -0.000628f, -0.000642f,
-0.000655f, -0.000668f, -0.000681f, -0.000695f, -0.000708f, -0.000721f,
-0.000734f, -0.000747f, -0.000760f, -0.000773f, -0.000786f, -0.000799f,
-0.000812f, -0.000825f, -0.000838f, -0.000851f, -0.000864f, -0.000877f,
-0.000890f, -0.000903f, -0.000916f, -0.000929f, -0.000941f, -0.000954f,
-0.000967f, -0.000979f, -0.000992f, -0.001005f, -0.001017f, -0.001030f,
-0.001042f, -0.001055f, -0.001068f, -0.001080f, -0.001092f, -0.001105f,
-0.001117f, -0.001130f, -0.001142f, -0.001154f, -0.001166f, -0.001179f,
-0.001191f, -0.001203f, -0.001215f, -0.001228f, -0.001239f, -0.001251f,
-0.001264f, -0.001275f, -0.001287f, -0.001299f, -0.001311f, -0.001323f,
-0.001335f, -0.001347f, -0.001358f, -0.001370f, -0.001382f, -0.001393f,
-0.001405f, -0.001417f, -0.001428f, -0.001439f, -0.001451f, -0.001462f,
-0.001474f, -0.001485f, -0.001496f, -0.001507f, -0.001519f, -0.001530f,
-0.001541f, -0.001552f, -0.001563f, -0.001574f, -0.001585f, -0.001596f,
-0.001607f, -0.001617f, -0.001628f, -0.001639f, -0.001650f, -0.001660f,
-0.001671f, -0.001682f, -0.001692f, -0.001702f, -0.001713f, -0.001723f,
-0.001734f, -0.001744f, -0.001754f, -0.001764f, -0.001774f, -0.001785f,
-0.001795f, -0.001805f, -0.001815f, -0.001824f, -0.001834f, -0.001844f,
-0.001854f, -0.001864f, -0.001873f, -0.001883f, -0.001893f, -0.001902f,
-0.001912f, -0.001921f, -0.001930f, -0.001940f, -0.001949f, -0.001958f,
-0.001967f, -0.001976f, -0.001986f, -0.001994f, -0.002003f, -0.002012f,
-0.002021f, -0.002030f, -0.002039f, -0.002047f, -0.002056f, -0.002065f,
-0.002073f, -0.002082f, -0.002090f, -0.002099f, -0.002107f, -0.002115f,
-0.002123f, -0.002131f, -0.002140f, -0.002148f, -0.002156f, -0.002164f,
-0.002171f, -0.002179f, -0.002187f, -0.002195f, -0.002202f, -0.002210f,
-0.002218f, -0.002225f, -0.002232f, -0.002240f, -0.002247f, -0.002254f,
-0.002262f, -0.002269f, -0.002276f, -0.002283f, -0.002290f, -0.002297f,
-0.002303f, -0.002310f, -0.002317f, -0.002324f, -0.002330f, -0.002337f,
-0.002343f, -0.002350f, -0.002356f, -0.002362f, -0.002369f, -0.002375f,
-0.002381f, -0.002387f, -0.002393f, -0.002399f, -0.002405f, -0.002411f,
-0.002416f, -0.002422f, -0.002428f, -0.002433f, -0.002439f, -0.002444f,
-0.002450f, -0.002455f, -0.002460f, -0.002465f, -0.002471f, -0.002476f,
-0.002481f, -0.002486f, -0.002491f, -0.002496f, -0.002500f, -0.002505f,
-0.002510f, -0.002514f, -0.002519f, -0.002523f, -0.002528f, -0.002532f,
-0.002536f, -0.002540f, -0.002545f, -0.002549f, -0.002553f, -0.002557f,
-0.002561f, -0.002564f, -0.002568f, -0.002572f, -0.002576f, -0.002579f,
-0.002583f, -0.002586f, -0.002590f, -0.002593f, -0.002596f, -0.002599f,
-0.002603f, -0.002606f, -0.002609f, -0.002612f, -0.002614f, -0.002617f,
-0.002620f, -0.002623f, -0.002625f, -0.002628f, -0.002630f, -0.002633f,
-0.002635f, -0.002638f, -0.002640f, -0.002642f, -0.002644f, -0.002646f,
-0.002648f, -0.002650f, -0.002652f, -0.002654f, -0.002656f, -0.002657f,
-0.002659f, -0.002660f, -0.002662f, -0.002663f, -0.002665f, -0.002666f,
-0.002667f, -0.002669f, -0.002670f, -0.002671f, -0.002672f, -0.002673f,
-0.002673f, -0.002674f, -0.002675f, -0.002676f, -0.002676f, -0.002677f,
-0.002677f, -0.002678f, -0.002678f, -0.002679f, -0.002679f, -0.002679f,
-0.002679f, -0.002679f, -0.002679f, -0.002679f, -0.002679f, -0.002679f,
-0.002678f, -0.002678f, -0.002678f, -0.002677f, -0.002677f, -0.002676f,
-0.002676f, -0.002675f, -0.002674f, -0.002674f, -0.002673f, -0.002672f,
-0.002671f, -0.002670f, -0.002669f, -0.002667f, -0.002666f, -0.002665f,
-0.002664f, -0.002662f, -0.002661f, -0.002659f, -0.002658f, -0.002656f,
-0.002654f, -0.002653f, -0.002651f, -0.002649f, -0.002647f, -0.002645f,
-0.002643f, -0.002641f, -0.002639f, -0.002637f, -0.002634f, -0.002632f,
-0.002630f, -0.002627f, -0.002625f, -0.002622f, -0.002620f, -0.002617f,
-0.002614f, -0.002612f, -0.002609f, -0.002606f, -0.002603f, -0.002600f,
-0.002597f, -0.002594f, -0.002591f, -0.002587f, -0.002584f, -0.002581f,
-0.002577f, -0.002574f, -0.002571f, -0.002567f, -0.002563f, -0.002560f,
-0.002556f, -0.002552f, -0.002548f, -0.002545f, -0.002541f, -0.002537f,
-0.002533f, -0.002529f, -0.002525f, -0.002521f, -0.002516f, -0.002512f,
-0.002508f, -0.002503f, -0.002499f, -0.002495f, -0.002490f, -0.002486f,
-0.002481f, -0.002476f, -0.002472f, -0.002467f, -0.002462f, -0.002457f,
-0.002452f, -0.002447f, -0.002442f, -0.002437f, -0.002432f, -0.002427f,
-0.002422f, -0.002417f, -0.002411f, -0.002406f, -0.002401f, -0.002395f,
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-0.000001f, -0.000001f, -0.000001f, -0.000001f, 0.000000f
};
/* vi: set ts=4 sw=4 expandtab: */

105
src/audio/SDL_audiocvt.c
View File

@ -704,97 +704,7 @@ SDL_Convert51To71(SDL_AudioCVT * cvt, SDL_AudioFormat format)
/* SDL's resampler uses a "bandlimited interpolation" algorithm:
https://ccrma.stanford.edu/~jos/resample/ */
#define RESAMPLER_ZERO_CROSSINGS 5
#define RESAMPLER_BITS_PER_SAMPLE 16
#define RESAMPLER_SAMPLES_PER_ZERO_CROSSING (1 << ((RESAMPLER_BITS_PER_SAMPLE / 2) + 1))
#define RESAMPLER_FILTER_SIZE ((RESAMPLER_SAMPLES_PER_ZERO_CROSSING * RESAMPLER_ZERO_CROSSINGS) + 1)
/* This is a "modified" bessel function, so you can't use POSIX j0() */
static double
bessel(const double x)
{
const double xdiv2 = x / 2.0;
double i0 = 1.0f;
double f = 1.0f;
int i = 1;
while (SDL_TRUE) {
const double diff = SDL_pow(xdiv2, i * 2) / SDL_pow(f, 2);
if (diff < 1.0e-21f) {
break;
}
i0 += diff;
i++;
f *= (double) i;
}
return i0;
}
/* build kaiser table with cardinal sine applied to it, and array of differences between elements. */
static void
kaiser_and_sinc(float *table, float *diffs, const int tablelen, const double beta)
{
const int lenm1 = tablelen - 1;
const int lenm1div2 = lenm1 / 2;
int i;
table[0] = 1.0f;
for (i = 1; i < tablelen; i++) {
const double kaiser = bessel(beta * SDL_sqrt(1.0 - SDL_pow(((i - lenm1) / 2.0) / lenm1div2, 2.0))) / bessel(beta);
table[tablelen - i] = (float) kaiser;
}
for (i = 1; i < tablelen; i++) {
const float x = (((float) i) / ((float) RESAMPLER_SAMPLES_PER_ZERO_CROSSING)) * ((float) M_PI);
table[i] *= SDL_sinf(x) / x;
diffs[i - 1] = table[i] - table[i - 1];
}
diffs[lenm1] = 0.0f;
}
static SDL_SpinLock ResampleFilterSpinlock = 0;
static float *ResamplerFilter = NULL;
static float *ResamplerFilterDifference = NULL;
int
SDL_PrepareResampleFilter(void)
{
SDL_AtomicLock(&ResampleFilterSpinlock);
if (!ResamplerFilter) {
/* if dB > 50, beta=(0.1102 * (dB - 8.7)), according to Matlab. */
const double dB = 80.0;
const double beta = 0.1102 * (dB - 8.7);
const size_t alloclen = RESAMPLER_FILTER_SIZE * sizeof (float);
ResamplerFilter = (float *) SDL_malloc(alloclen);
if (!ResamplerFilter) {
SDL_AtomicUnlock(&ResampleFilterSpinlock);
return SDL_OutOfMemory();
}
ResamplerFilterDifference = (float *) SDL_malloc(alloclen);
if (!ResamplerFilterDifference) {
SDL_free(ResamplerFilter);
ResamplerFilter = NULL;
SDL_AtomicUnlock(&ResampleFilterSpinlock);
return SDL_OutOfMemory();
}
kaiser_and_sinc(ResamplerFilter, ResamplerFilterDifference, RESAMPLER_FILTER_SIZE, beta);
}
SDL_AtomicUnlock(&ResampleFilterSpinlock);
return 0;
}
void
SDL_FreeResampleFilter(void)
{
SDL_free(ResamplerFilter);
SDL_free(ResamplerFilterDifference);
ResamplerFilter = NULL;
ResamplerFilterDifference = NULL;
}
#include "SDL_audio_resampler_filter.h"
static int
ResamplerPadding(const int inrate, const int outrate)
@ -803,7 +713,7 @@ ResamplerPadding(const int inrate, const int outrate)
return 0;
}
if (inrate > outrate) {
return (int) SDL_ceil(((float) (RESAMPLER_SAMPLES_PER_ZERO_CROSSING * inrate) / ((float) outrate)));
return (int) SDL_ceilf(((float) (RESAMPLER_SAMPLES_PER_ZERO_CROSSING * inrate) / ((float) outrate)));
}
return RESAMPLER_SAMPLES_PER_ZERO_CROSSING;
}
@ -1119,10 +1029,6 @@ SDL_BuildAudioResampleCVT(SDL_AudioCVT * cvt, const int dst_channels,
return SDL_SetError("No conversion available for these rates");
}
if (SDL_PrepareResampleFilter() < 0) {
return -1;
}
/* Update (cvt) with filter details... */
if (SDL_AddAudioCVTFilter(cvt, filter) < 0) {
return -1;
@ -1743,13 +1649,6 @@ SDL_NewAudioStream(const SDL_AudioFormat src_format,
return NULL;
}
if (SDL_PrepareResampleFilter() < 0) {
SDL_free(retval->resampler_state);
retval->resampler_state = NULL;
SDL_FreeAudioStream(retval);
return NULL;
}
retval->resampler_func = SDL_ResampleAudioStream;
retval->reset_resampler_func = SDL_ResetAudioStreamResampler;
retval->cleanup_resampler_func = SDL_CleanupAudioStreamResampler;