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Allow hard-coding of the 32kB cubic-root table for AAC.

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Originally committed as revision 22527 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-03-14 19:59:47 +00:00
parent 7732f641ff
commit c26bce1070
4 changed files with 96 additions and 9 deletions
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1
libavcodec/Makefile
View File

@ -757,6 +757,7 @@ $(SUBDIR)%_tables.h: $(SUBDIR)%_tablegen$(HOSTEXESUF)
$(M)./$< > $@
ifdef CONFIG_HARDCODED_TABLES
$(SUBDIR)aac.o: $(SUBDIR)cbrt_tables.h
$(SUBDIR)mdct.o: $(SUBDIR)mdct_tables.h
$(SUBDIR)mpegaudiodec.o: $(SUBDIR)mpegaudio_tables.h
$(SUBDIR)motionpixels.o: $(SUBDIR)motionpixels_tables.h

11
libavcodec/aac.c
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@ -86,6 +86,7 @@
#include "aac.h"
#include "aactab.h"
#include "aacdectab.h"
#include "cbrt_tablegen.h"
#include "sbr.h"
#include "aacsbr.h"
#include "mpeg4audio.h"
@ -108,8 +109,6 @@ union float754 {
static VLC vlc_scalefactors;
static VLC vlc_spectral[11];
static uint32_t cbrt_tab[1<<13];
static const char overread_err[] = "Input buffer exhausted before END element found\n";
static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
@ -574,13 +573,7 @@ static av_cold int aac_decode_init(AVCodecContext *avccontext)
ff_init_ff_sine_windows(10);
ff_init_ff_sine_windows( 7);
if (!cbrt_tab[(1<<13) - 1]) {
for (i = 0; i < 1<<13; i++) {
union float754 f;
f.f = cbrtf(i) * i;
cbrt_tab[i] = f.i;
}
}
cbrt_tableinit();
return 0;
}

42
libavcodec/cbrt_tablegen.c Normal file
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@ -0,0 +1,42 @@
/*
* Generate a header file for hardcoded AAC cube-root table
*
* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#define CONFIG_HARDCODED_TABLES 0
#include "cbrt_tablegen.h"
#include "tableprint.h"
void tableinit(void)
{
cbrt_tableinit();
}
const struct tabledef tables[] = {
{
"static const uint32_t cbrt_tab[1<<13]",
write_uint32_array,
cbrt_tab,
1 << 13,
0
},
{ NULL }
};

51
libavcodec/cbrt_tablegen.h Normal file
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@ -0,0 +1,51 @@
/*
* Header file for hardcoded AAC cube-root table
*
* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CBRT_TABLEGEN_H
#define CBRT_TABLEGEN_H
#include <stdint.h>
#include <math.h>
#if CONFIG_HARDCODED_TABLES
#define cbrt_tableinit()
#include "libavcodec/cbrt_tables.h"
#else
static uint32_t cbrt_tab[1 << 13];
static void cbrt_tableinit(void)
{
if (!cbrt_tab[(1<<13) - 1]) {
int i;
for (i = 0; i < 1<<13; i++) {
union {
float f;
uint32_t i;
} f;
f.f = cbrtf(i) * i;
cbrt_tab[i] = f.i;
}
}
}
#endif /* CONFIG_HARDCODED_TABLES */
#endif /* CBRT_TABLEGEN_H */