mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
698a4b22d0
The fixed-point AAC decoder is the only user of the fixed-point sinewin
tables from sinewin; and it only uses a few of them (about 10% when
counting by size). This means that guarding initializing these tables by
an AVOnce (as done in 3719122065
) is
unnecessary for them. Furthermore the array of pointers to the
individual arrays is also unneeded.
Therefore this commit moves these tables directly into aacdec_fixed.c;
this is done by ridding the original sinewin.h and sinewin_tablegen.h
headers completely of any fixed-point code at the cost of a bit of
duplicated code (the alternative is an ugly ifdef-mess).
This saves about 58KB from the binary when using hardcoded tables (as
these tables are hardcoded in this scenario); when not using hardcoded
tables, most of these savings only affect the .bss segment, but the rest
(< 1KB) contains relocations (i.e. savings in .data.rel.ro).
Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
|
|
* Header file for hardcoded sine windows
|
|
*
|
|
* Copyright (c) 2009 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 AVCODEC_SINEWIN_FIXED_TABLEGEN_H
|
|
#define AVCODEC_SINEWIN_FIXED_TABLEGEN_H
|
|
|
|
#ifdef BUILD_TABLES
|
|
#undef DECLARE_ALIGNED
|
|
#define DECLARE_ALIGNED(align, type, name) type name
|
|
#else
|
|
#include "libavutil/mem_internal.h"
|
|
#endif
|
|
|
|
#define SINETABLE(size) \
|
|
static SINETABLE_CONST DECLARE_ALIGNED(32, int, sine_##size##_fixed)[size]
|
|
|
|
#if CONFIG_HARDCODED_TABLES
|
|
#define init_sine_windows_fixed()
|
|
#define SINETABLE_CONST const
|
|
#include "libavcodec/sinewin_fixed_tables.h"
|
|
#else
|
|
// do not use libavutil/libm.h since this is compiled both
|
|
// for the host and the target and config.h is only valid for the target
|
|
#include <math.h>
|
|
#include "libavutil/attributes.h"
|
|
|
|
#define SINETABLE_CONST
|
|
SINETABLE( 128);
|
|
SINETABLE( 512);
|
|
SINETABLE(1024);
|
|
|
|
#define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
|
|
|
|
// Generate a sine window.
|
|
static av_cold void sine_window_init_fixed(int *window, int n)
|
|
{
|
|
for (int i = 0; i < n; i++)
|
|
window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
|
|
}
|
|
|
|
static av_cold void init_sine_windows_fixed(void)
|
|
{
|
|
sine_window_init_fixed(sine_128_fixed, 128);
|
|
sine_window_init_fixed(sine_512_fixed, 512);
|
|
sine_window_init_fixed(sine_1024_fixed, 1024);
|
|
}
|
|
#endif /* CONFIG_HARDCODED_TABLES */
|
|
#endif /* AVCODEC_SINEWIN_FIXED_TABLEGEN_H */
|