utils.c File Reference

#include "config.h"
#include <inttypes.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/cpu.h"
#include "libavutil/csp.h"
#include "libavutil/emms.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/refstruct.h"
#include "libavutil/slicethread.h"
#include "libavutil/thread.h"
#include "libavutil/aarch64/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/x86/cpu.h"
#include "libavutil/loongarch/cpu.h"
#include "rgb2rgb.h"
#include "swscale.h"
#include "swscale_internal.h"
#include "graph.h"
#include "jit.h"

Go to the source code of this file.

Data Structures
struct	ScaleAlgorithm

Macros
#define	_DEFAULT_SOURCE

Functions
SwsBackend	ff_sws_enabled_backends (const SwsContext *ctx)
static SwsContext *	alloc_set_opts (int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, const double *param)
	Allocate and return an SwsContext without performing initialization.
int	ff_shuffle_filter_coefficients (SwsInternal *c, int *filterPos, int filterSize, int16_t *filter, int dstW)
static double	getSplineCoeff (double a, double b, double c, double d, double dist)
static av_cold int	get_local_pos (SwsInternal *s, int chr_subsample, int pos, int dir)
static av_cold int	initFilter (int16_t **outFilter, int32_t **filterPos, int *outFilterSize, int xInc, int srcW, int dstW, int filterAlign, int one, int scaler, int flags, int cpu_flags, SwsVector *srcFilter, SwsVector *dstFilter, double param[SWS_NUM_SCALER_PARAMS], int srcPos, int dstPos)
static void	fill_rgb2yuv_table (SwsInternal *c, const int table[4], int dstRange)
static av_cold void	init_xyz_tables (void)
av_cold int	ff_sws_fill_xyztables (SwsInternal *c)
static int	handle_jpeg (int *format)
static int	handle_0alpha (int *format)
static int	handle_xyz (int *format)
static int	handle_formats (SwsContext *sws)
static int	range_override_needed (enum AVPixelFormat format)
int	sws_setColorspaceDetails (SwsContext *sws, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)
int	sws_getColorspaceDetails (SwsContext *sws, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)
SwsContext *	sws_alloc_context (void)
	Allocate an empty SwsContext and set its fields to default values.
static uint16_t *	alloc_gamma_tbl (double e)
static enum AVPixelFormat	alphaless_fmt (enum AVPixelFormat fmt)
static int	scaler_flag (SwsScaler scaler, int fallback)
av_cold int	ff_sws_init_single_context (SwsContext *sws, SwsFilter *srcFilter, SwsFilter *dstFilter)
static int	context_init_threaded (SwsContext *sws, SwsFilter *src_filter, SwsFilter *dst_filter)
av_cold int	sws_init_context (SwsContext *sws, SwsFilter *srcFilter, SwsFilter *dstFilter)
	Initialize the swscaler context sws_context.
SwsContext *	sws_getContext (int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
	Allocate and return an SwsContext.
static int	isnan_vec (SwsVector *a)
static void	makenan_vec (SwsVector *a)
SwsVector *	sws_allocVec (int length)
	Allocate and return an uninitialized vector with length coefficients.
SwsVector *	sws_getGaussianVec (double variance, double quality)
	Return a normalized Gaussian curve used to filter stuff quality = 3 is high quality, lower is lower quality.
static SwsVector *	sws_getConstVec (double c, int length)
	Allocate and return a vector with length coefficients, all with the same value c.
static SwsVector *	sws_getIdentityVec (void)
	Allocate and return a vector with just one coefficient, with value 1.0.
static double	sws_dcVec (SwsVector *a)
void	sws_scaleVec (SwsVector *a, double scalar)
	Scale all the coefficients of a by the scalar value.
void	sws_normalizeVec (SwsVector *a, double height)
	Scale all the coefficients of a so that their sum equals height.
static SwsVector *	sws_sumVec (SwsVector *a, SwsVector *b)
static SwsVector *	sws_getShiftedVec (SwsVector *a, int shift)
static void	sws_shiftVec (SwsVector *a, int shift)
static void	sws_addVec (SwsVector *a, SwsVector *b)
static void	sws_printVec2 (SwsVector *a, AVClass *log_ctx, int log_level)
	Print with av_log() a textual representation of the vector a if log_level <= av_log_level.
void	sws_freeVec (SwsVector *a)
void	sws_freeFilter (SwsFilter *filter)
SwsFilter *	sws_getDefaultFilter (float lumaGBlur, float chromaGBlur, float lumaSharpen, float chromaSharpen, float chromaHShift, float chromaVShift, int verbose)
void	sws_freeContext (SwsContext *sws)
	Free the swscaler context swsContext.
void	sws_free_context (SwsContext **pctx)
	Free the context and everything associated with it, and write NULL to the provided pointer.
SwsContext *	sws_getCachedContext (SwsContext *prev, int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
	Check if context can be reused, otherwise reallocate a new one.
int	ff_range_add (RangeList *rl, unsigned int start, unsigned int len)
int	ff_sws_thread_exec (void *priv, int(*func)(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads), int nb_threads, int nb_jobs)
	Helper for dispatching a single function across multiple threads.

Variables
static const ScaleAlgorithm	scale_algorithms []
static uint16_t	xyzgamma_tab [4096]
static uint16_t	rgbgammainv_tab [4096]
static uint16_t	rgbgamma_tab [65536]
static uint16_t	xyzgammainv_tab [65536]

Macro Definition Documentation

_DEFAULT_SOURCE

#define _DEFAULT_SOURCE

Definition at line 24 of file utils.c.

Function Documentation

ff_sws_enabled_backends()

SwsBackend ff_sws_enabled_backends

(

const SwsContext *

ctx

)

Definition at line 60 of file utils.c.

Referenced by add_legacy_sws_pass(), add_ops_convert_pass(), ff_sws_ops_compile(), and sws_frame_setup().

alloc_set_opts()

static SwsContext * alloc_set_opts ( int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, const double * param )

static

Allocate and return an SwsContext without performing initialization.

Definition at line 75 of file utils.c.

Referenced by ff_sws_init_single_context(), sws_getContext(), and sws_setColorspaceDetails().

ff_shuffle_filter_coefficients()

int ff_shuffle_filter_coefficients	(	SwsInternal *	c,
		int *	filterPos,
		int	filterSize,
		int16_t *	filter,
		int	dstW )

Definition at line 97 of file utils.c.

Referenced by check_hscale(), and ff_sws_init_single_context().

getSplineCoeff()

static double getSplineCoeff ( double a, double b, double c, double d, double dist )

static

Definition at line 155 of file utils.c.

Referenced by getSplineCoeff(), and initFilter().

get_local_pos()

static av_cold int get_local_pos ( SwsInternal * s, int chr_subsample, int pos, int dir )

static

Definition at line 168 of file utils.c.

Referenced by ff_sws_init_single_context().

initFilter()

static av_cold int initFilter ( int16_t ** outFilter, int32_t ** filterPos, int * outFilterSize, int xInc, int srcW, int dstW, int filterAlign, int one, int scaler, int flags, int cpu_flags, SwsVector * srcFilter, SwsVector * dstFilter, double param[SWS_NUM_SCALER_PARAMS], int srcPos, int dstPos )

static

Definition at line 197 of file utils.c.

Referenced by ff_sws_init_single_context().

fill_rgb2yuv_table()

static void fill_rgb2yuv_table ( SwsInternal * c, const int table[4], int dstRange )

static

dstRange &&

Definition at line 614 of file utils.c.

Referenced by sws_setColorspaceDetails().

init_xyz_tables()

static av_cold void init_xyz_tables ( void )

static

Definition at line 714 of file utils.c.

Referenced by ff_sws_fill_xyztables().

ff_sws_fill_xyztables()

av_cold int ff_sws_fill_xyztables

(

SwsInternal *

c

)

Definition at line 735 of file utils.c.

Referenced by check_xyz12Torgb48le(), and handle_formats().

handle_jpeg()

static int handle_jpeg ( int * format )

static

Definition at line 773 of file utils.c.

Referenced by sws_init_context().

handle_0alpha()

static int handle_0alpha ( int * format )

static

Definition at line 811 of file utils.c.

Referenced by handle_formats().

handle_xyz()

static int handle_xyz ( int * format )

static

Definition at line 822 of file utils.c.

Referenced by handle_formats().

handle_formats()

static int handle_formats ( SwsContext * sws )

static

Definition at line 831 of file utils.c.

Referenced by ff_sws_init_single_context(), and sws_setColorspaceDetails().

range_override_needed()

static int range_override_needed ( enum AVPixelFormat format )

static

Definition at line 844 of file utils.c.

Referenced by sws_getColorspaceDetails(), and sws_setColorspaceDetails().

alloc_gamma_tbl()

static uint16_t * alloc_gamma_tbl ( double e )

static

Definition at line 1046 of file utils.c.

Referenced by ff_sws_init_single_context().

alphaless_fmt()

static enum AVPixelFormat alphaless_fmt ( enum AVPixelFormat fmt )

static

Definition at line 1060 of file utils.c.

Referenced by ff_sws_init_single_context().

scaler_flag()

static int scaler_flag ( SwsScaler scaler, int fallback )

static

Definition at line 1121 of file utils.c.

Referenced by ff_sws_init_single_context().

ff_sws_init_single_context()

av_cold int ff_sws_init_single_context	(	SwsContext *	sws,
		SwsFilter *	srcFilter,
		SwsFilter *	dstFilter )

Definition at line 1137 of file utils.c.

Referenced by context_init_threaded(), init_legacy_subpass(), and sws_init_context().

context_init_threaded()

static int context_init_threaded ( SwsContext * sws, SwsFilter * src_filter, SwsFilter * dst_filter )

static

Definition at line 1837 of file utils.c.

Referenced by sws_init_context().

isnan_vec()

static int isnan_vec ( SwsVector * a )

static

Definition at line 1940 of file utils.c.

Referenced by sws_getDefaultFilter().

makenan_vec()

static void makenan_vec ( SwsVector * a )

static

Definition at line 1949 of file utils.c.

Referenced by sws_addVec(), and sws_shiftVec().

sws_getConstVec()

static SwsVector * sws_getConstVec ( double c, int length )

static

Allocate and return a vector with length coefficients, all with the same value c.

Definition at line 2004 of file utils.c.

Referenced by sws_getIdentityVec(), sws_getShiftedVec(), and sws_sumVec().

sws_getIdentityVec()

static SwsVector * sws_getIdentityVec ( void )

static

Allocate and return a vector with just one coefficient, with value 1.0.

Definition at line 2023 of file utils.c.

Referenced by sws_getDefaultFilter().

sws_dcVec()

static double sws_dcVec ( SwsVector * a )

static

Definition at line 2028 of file utils.c.

Referenced by sws_normalizeVec().

sws_sumVec()

static SwsVector * sws_sumVec ( SwsVector * a, SwsVector * b )

static

Definition at line 2052 of file utils.c.

Referenced by sws_addVec().

sws_getShiftedVec()

static SwsVector * sws_getShiftedVec ( SwsVector * a, int shift )

static

Definition at line 2070 of file utils.c.

Referenced by sws_shiftVec().

sws_shiftVec()

static void sws_shiftVec ( SwsVector * a, int shift )

static

Definition at line 2088 of file utils.c.

Referenced by sws_getDefaultFilter().

sws_addVec()

static void sws_addVec ( SwsVector * a, SwsVector * b )

static

Definition at line 2102 of file utils.c.

Referenced by sws_getDefaultFilter().

sws_printVec2()

static void sws_printVec2 ( SwsVector * a, AVClass * log_ctx, int log_level )

static

Print with av_log() a textual representation of the vector a if log_level <= av_log_level.

Definition at line 2120 of file utils.c.

Referenced by sws_getDefaultFilter().

ff_range_add()

int ff_range_add	(	RangeList *	rl,
		unsigned int	start,
		unsigned int	len )

Definition at line 2384 of file utils.c.

Referenced by sws_send_slice().

ff_sws_thread_exec()

int ff_sws_thread_exec	(	void *	priv,
		int(*	func )(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads),
		int	nb_threads,
		int	nb_jobs )

Helper for dispatching a single function across multiple threads.

This is a wrapper around avpriv_slicethread_create2() + avpriv_slicethread_execute2(), falling back to direct invocation if threading is not available.

Definition at line 2444 of file utils.c.

Referenced by ff_sws_enum_op_lists().

Variable Documentation

scale_algorithms

const ScaleAlgorithm scale_algorithms[]

static

Initial value:

= {
    { SWS_AREA,          "area averaging",                  1  },
    { SWS_BICUBIC,       "bicubic",                         4 },
    { SWS_BICUBLIN,      "luma bicubic / chroma bilinear", -1 },
    { SWS_BILINEAR,      "bilinear",                        2 },
    { SWS_FAST_BILINEAR, "fast bilinear",                  -1 },
    { SWS_GAUSS,         "Gaussian",                        8  },
    { SWS_LANCZOS,       "Lanczos",                        -1  },
    { SWS_POINT,         "nearest neighbor / point",       -1 },
    { SWS_SINC,          "sinc",                           20  },
    { SWS_SPLINE,        "bicubic spline",                 20  },
    { SWS_X,             "experimental",                    8 },
}

Definition at line 183 of file utils.c.

Referenced by ff_sws_init_single_context(), and initFilter().

xyzgamma_tab

uint16_t xyzgamma_tab[4096]

static

Definition at line 712 of file utils.c.

Referenced by ff_sws_fill_xyztables(), and init_xyz_tables().

rgbgammainv_tab

uint16_t rgbgammainv_tab[4096]

static

Definition at line 712 of file utils.c.

Referenced by ff_sws_fill_xyztables(), and init_xyz_tables().

rgbgamma_tab

uint16_t rgbgamma_tab[65536]

static

Definition at line 713 of file utils.c.

Referenced by ff_sws_fill_xyztables(), and init_xyz_tables().

xyzgammainv_tab

uint16_t xyzgammainv_tab[65536]

static

Definition at line 713 of file utils.c.

Referenced by ff_sws_fill_xyztables(), and init_xyz_tables().