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Use hardcoded instead of runtime-calculated ff_cos_* tables if
--enable-hardcoded-tables was used. Due to the size, the code for the tables is generated at compile time. Originally committed as revision 20232 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger
parent
6d924b5a5f
commit
16aec74761
@ -27,7 +27,8 @@ OBJS = allcodecs.o \
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# parts needed for many different codecs
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OBJS-$(CONFIG_AANDCT) += aandcttab.o
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OBJS-$(CONFIG_ENCODERS) += faandct.o jfdctfst.o jfdctint.o
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OBJS-$(CONFIG_FFT) += fft.o
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FFT-OBJS-$(CONFIG_HARDCODED_TABLES) += cos_tables.o
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OBJS-$(CONFIG_FFT) += fft.o $(FFT-OBJS-yes)
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OBJS-$(CONFIG_GOLOMB) += golomb.o
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OBJS-$(CONFIG_MDCT) += mdct.o
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OBJS-$(CONFIG_RDFT) += rdft.o
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@ -571,6 +572,14 @@ TESTPROGS-$(HAVE_MMX) += motion
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DIRS = alpha arm bfin mlib ppc ps2 sh4 sparc x86
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CLEANFILES = cos_tables.c costablegen$(HOSTEXESUF)
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include $(SUBDIR)../subdir.mak
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$(SUBDIR)dct-test$(EXESUF): $(SUBDIR)dctref.o
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$(SUBDIR)costablegen$(HOSTEXESUF): $(SUBDIR)costablegen.c
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$(HOSTCC) $(HOSTCFLAGS) $(HOSTLDFLAGS) -o $@ $< $(HOSTLIBS)
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$(SUBDIR)cos_tables.c: $(SUBDIR)costablegen$(HOSTEXESUF)
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./$< > $@
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50
libavcodec/costablegen.c
Normal file
50
libavcodec/costablegen.c
Normal file
@ -0,0 +1,50 @@
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/*
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* Generate a header file for hardcoded ff_cos_* tables
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*
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#define BITS 16
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#define FLOATFMT "%.18e"
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int main(void)
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{
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int i, j;
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printf("/* This file was generated by libavcodec/costablegen */\n");
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printf("#include \"dsputil.h\"\n");
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for (i = 4; i <= BITS; i++) {
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int m = 1 << i;
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double freq = 2*M_PI/m;
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printf("const DECLARE_ALIGNED_16(FFTSample, ff_cos_%i[]) = {\n ", m);
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for (j = 0; j < m/2 - 1; j++) {
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int idx = j > m/4 ? m/2 - j : j;
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printf(" "FLOATFMT",", cos(idx*freq));
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if ((j & 3) == 3)
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printf("\n ");
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}
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printf(" "FLOATFMT"\n};\n", cos(freq));
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}
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return 0;
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}
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@ -742,7 +742,11 @@ typedef struct FFTContext {
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#define FF_MDCT_PERM_INTERLEAVE 1
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} FFTContext;
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#if CONFIG_HARDCODED_TABLES
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extern const FFTSample* const ff_cos_tabs[13];
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#else
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extern FFTSample* const ff_cos_tabs[13];
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#endif
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/**
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* Sets up a complex FFT.
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@ -28,20 +28,31 @@
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#include "dsputil.h"
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#if CONFIG_HARDCODED_TABLES
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#define COSTABLE(size) \
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extern const DECLARE_ALIGNED_16(FFTSample, ff_cos_##size[size/2]);
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#else
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#define COSTABLE(size) \
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DECLARE_ALIGNED_16(FFTSample, ff_cos_##size[size/2]);
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#endif
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/* cos(2*pi*x/n) for 0<=x<=n/4, followed by its reverse */
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DECLARE_ALIGNED_16(FFTSample, ff_cos_16[8]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_32[16]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_64[32]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_128[64]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_256[128]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_512[256]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_1024[512]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_2048[1024]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_4096[2048]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_8192[4096]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_16384[8192]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_32768[16384]);
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DECLARE_ALIGNED_16(FFTSample, ff_cos_65536[32768]);
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COSTABLE(16)
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COSTABLE(32)
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COSTABLE(64)
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COSTABLE(128)
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COSTABLE(256)
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COSTABLE(512)
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COSTABLE(1024)
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COSTABLE(2048)
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COSTABLE(4096)
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COSTABLE(8192)
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COSTABLE(16384)
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COSTABLE(32768)
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COSTABLE(65536)
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#if CONFIG_HARDCODED_TABLES
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const
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#endif
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FFTSample * const ff_cos_tabs[] = {
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ff_cos_16, ff_cos_32, ff_cos_64, ff_cos_128, ff_cos_256, ff_cos_512, ff_cos_1024,
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ff_cos_2048, ff_cos_4096, ff_cos_8192, ff_cos_16384, ff_cos_32768, ff_cos_65536,
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@ -93,6 +104,7 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
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if (HAVE_MMX) ff_fft_init_mmx(s);
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if (s->split_radix) {
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#if !CONFIG_HARDCODED_TABLES
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for(j=4; j<=nbits; j++) {
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int m = 1<<j;
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double freq = 2*M_PI/m;
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@ -102,6 +114,7 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
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for(i=1; i<m/4; i++)
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tab[m/2-i] = tab[i];
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}
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#endif
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for(i=0; i<n; i++)
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s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = i;
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s->tmp_buf = av_malloc(n * sizeof(FFTComplex));
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