09c2d08c
 Hu Chunming
arm交付版
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/*
* 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_TABLEGEN_H
#define AVCODEC_SINEWIN_TABLEGEN_H
#include <assert.h>
// 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"
#include "libavutil/common.h"
#if !CONFIG_HARDCODED_TABLES
#ifndef BUILD_TABLES
#include "libavutil/thread.h"
#endif
SINETABLE( 32);
SINETABLE( 64);
SINETABLE( 128);
SINETABLE( 256);
SINETABLE( 512);
SINETABLE(1024);
SINETABLE(2048);
SINETABLE(4096);
SINETABLE(8192);
#else
#include "libavcodec/sinewin_tables.h"
#endif
SINETABLE_CONST float *const ff_sine_windows[] = {
NULL, NULL, NULL, NULL, NULL, // unused
ff_sine_32, ff_sine_64, ff_sine_128,
ff_sine_256, ff_sine_512, ff_sine_1024,
ff_sine_2048, ff_sine_4096, ff_sine_8192,
};
// Generate a sine window.
av_cold void ff_sine_window_init(float *window, int n)
{
int i;
for(i = 0; i < n; i++)
window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
}
#if !CONFIG_HARDCODED_TABLES && !defined(BUILD_TABLES)
#define INIT_FF_SINE_WINDOW_INIT_FUNC(index) \
static void init_ff_sine_window_ ## index(void) \
{ \
ff_sine_window_init(ff_sine_windows[index], 1 << index);\
}
INIT_FF_SINE_WINDOW_INIT_FUNC(5)
INIT_FF_SINE_WINDOW_INIT_FUNC(6)
INIT_FF_SINE_WINDOW_INIT_FUNC(7)
INIT_FF_SINE_WINDOW_INIT_FUNC(8)
INIT_FF_SINE_WINDOW_INIT_FUNC(9)
INIT_FF_SINE_WINDOW_INIT_FUNC(10)
INIT_FF_SINE_WINDOW_INIT_FUNC(11)
INIT_FF_SINE_WINDOW_INIT_FUNC(12)
INIT_FF_SINE_WINDOW_INIT_FUNC(13)
static void (*const sine_window_init_func_array[])(void) = {
init_ff_sine_window_5,
init_ff_sine_window_6,
init_ff_sine_window_7,
init_ff_sine_window_8,
init_ff_sine_window_9,
init_ff_sine_window_10,
init_ff_sine_window_11,
init_ff_sine_window_12,
init_ff_sine_window_13,
};
static AVOnce init_sine_window_once[9] = {
AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT,
AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT
};
#endif
av_cold void ff_init_ff_sine_windows(int index)
{
assert(index >= 5 && index < FF_ARRAY_ELEMS(ff_sine_windows));
#if !CONFIG_HARDCODED_TABLES
#ifdef BUILD_TABLES
ff_sine_window_init(ff_sine_windows[index], 1 << index);
#else
ff_thread_once(&init_sine_window_once[index - 5], sine_window_init_func_array[index - 5]);
#endif
#endif
}
#endif /* AVCODEC_SINEWIN_TABLEGEN_H */
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