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avcodec/fft_template: use ff_thread_once on costable initialization

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Make it thread-safe and avoid redundant initialization.

Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz 2017-07-05 12:33:22 +07:00
parent 2d417076a2
commit 1af615683e
1 changed files with 71 additions and 10 deletions
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81
libavcodec/fft_template.c
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@ -29,11 +29,19 @@
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include "libavutil/mathematics.h" #include "libavutil/mathematics.h"
#include "libavutil/thread.h"
#include "fft.h" #include "fft.h"
#include "fft-internal.h" #include "fft-internal.h"
#if FFT_FIXED_32 #if FFT_FIXED_32
#include "fft_table.h" #include "fft_table.h"
static void av_cold fft_lut_init(void)
{
int n = 0;
ff_fft_lut_init(ff_fft_offsets_lut, 0, 1 << 17, &n);
}
#else /* FFT_FIXED_32 */ #else /* FFT_FIXED_32 */
/* cos(2*pi*x/n) for 0<=x<=n/4, followed by its reverse */ /* cos(2*pi*x/n) for 0<=x<=n/4, followed by its reverse */
@ -52,6 +60,66 @@ COSTABLE(16384);
COSTABLE(32768); COSTABLE(32768);
COSTABLE(65536); COSTABLE(65536);
COSTABLE(131072); COSTABLE(131072);
static av_cold void init_ff_cos_tabs(int index)
{
int i;
int m = 1<<index;
double freq = 2*M_PI/m;
FFTSample *tab = FFT_NAME(ff_cos_tabs)[index];
for(i=0; i<=m/4; i++)
tab[i] = FIX15(cos(i*freq));
for(i=1; i<m/4; i++)
tab[m/2-i] = tab[i];
}
typedef struct CosTabsInitOnce {
void (*func)(void);
AVOnce control;
} CosTabsInitOnce;
#define INIT_FF_COS_TABS_FUNC(index, size) \
static av_cold void init_ff_cos_tabs_ ## size (void)\
{ \
init_ff_cos_tabs(index); \
}
INIT_FF_COS_TABS_FUNC(4, 16)
INIT_FF_COS_TABS_FUNC(5, 32)
INIT_FF_COS_TABS_FUNC(6, 64)
INIT_FF_COS_TABS_FUNC(7, 128)
INIT_FF_COS_TABS_FUNC(8, 256)
INIT_FF_COS_TABS_FUNC(9, 512)
INIT_FF_COS_TABS_FUNC(10, 1024)
INIT_FF_COS_TABS_FUNC(11, 2048)
INIT_FF_COS_TABS_FUNC(12, 4096)
INIT_FF_COS_TABS_FUNC(13, 8192)
INIT_FF_COS_TABS_FUNC(14, 16384)
INIT_FF_COS_TABS_FUNC(15, 32768)
INIT_FF_COS_TABS_FUNC(16, 65536)
INIT_FF_COS_TABS_FUNC(17, 131072)
static CosTabsInitOnce cos_tabs_init_once[] = {
{ NULL },
{ NULL },
{ NULL },
{ NULL },
{ init_ff_cos_tabs_16, AV_ONCE_INIT },
{ init_ff_cos_tabs_32, AV_ONCE_INIT },
{ init_ff_cos_tabs_64, AV_ONCE_INIT },
{ init_ff_cos_tabs_128, AV_ONCE_INIT },
{ init_ff_cos_tabs_256, AV_ONCE_INIT },
{ init_ff_cos_tabs_512, AV_ONCE_INIT },
{ init_ff_cos_tabs_1024, AV_ONCE_INIT },
{ init_ff_cos_tabs_2048, AV_ONCE_INIT },
{ init_ff_cos_tabs_4096, AV_ONCE_INIT },
{ init_ff_cos_tabs_8192, AV_ONCE_INIT },
{ init_ff_cos_tabs_16384, AV_ONCE_INIT },
{ init_ff_cos_tabs_32768, AV_ONCE_INIT },
{ init_ff_cos_tabs_65536, AV_ONCE_INIT },
{ init_ff_cos_tabs_131072, AV_ONCE_INIT },
};
#endif #endif
COSTABLE_CONST FFTSample * const FFT_NAME(ff_cos_tabs)[] = { COSTABLE_CONST FFTSample * const FFT_NAME(ff_cos_tabs)[] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
@ -90,14 +158,7 @@ static int split_radix_permutation(int i, int n, int inverse)
av_cold void ff_init_ff_cos_tabs(int index) av_cold void ff_init_ff_cos_tabs(int index)
{ {
#if (!CONFIG_HARDCODED_TABLES) && (!FFT_FIXED_32) #if (!CONFIG_HARDCODED_TABLES) && (!FFT_FIXED_32)
int i; ff_thread_once(&cos_tabs_init_once[index].control, cos_tabs_init_once[index].func);
int m = 1<<index;
double freq = 2*M_PI/m;
FFTSample *tab = FFT_NAME(ff_cos_tabs)[index];
for(i=0; i<=m/4; i++)
tab[i] = FIX15(cos(i*freq));
for(i=1; i<m/4; i++)
tab[m/2-i] = tab[i];
#endif #endif
} }
@ -176,8 +237,8 @@ av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
#if FFT_FIXED_32 #if FFT_FIXED_32
{ {
int n=0; static AVOnce control = AV_ONCE_INIT;
ff_fft_lut_init(ff_fft_offsets_lut, 0, 1 << 17, &n); ff_thread_once(&control, fft_lut_init);
} }
#else /* FFT_FIXED_32 */ #else /* FFT_FIXED_32 */
#if FFT_FLOAT #if FFT_FLOAT