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/avutil.h"
#include "libavutil/bswap.h"
#include "libavutil/cpu.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/aarch64/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/x86/asm.h"
#include "libavutil/x86/cpu.h"
#include "rgb2rgb.h"
#include "swscale.h"
#include "swscale_internal.h"

Go to the source code of this file.

Data Structures
struct	FormatEntry
struct	ScaleAlgorithm

Macros
#define	_DEFAULT_SOURCE
#define	_SVID_SOURCE
#define	_DARWIN_C_SOURCE
#define	attribute_deprecated
#define	LICENSE_PREFIX   "libswscale license: "
#define	USE_MMAP   0

Functions
static void	handle_formats (SwsContext *c)
unsigned	swscale_version (void)
const char *	swscale_configuration (void)
	Return the libswscale build-time configuration. More...
const char *	swscale_license (void)
	Return the libswscale license. More...
int	sws_isSupportedInput (enum AVPixelFormat pix_fmt)
	Return a positive value if pix_fmt is a supported input format, 0 otherwise. More...
int	sws_isSupportedOutput (enum AVPixelFormat pix_fmt)
	Return a positive value if pix_fmt is a supported output format, 0 otherwise. More...
int	sws_isSupportedEndiannessConversion (enum AVPixelFormat pix_fmt)
static double	getSplineCoeff (double a, double b, double c, double d, double dist)
static av_cold int	get_local_pos (SwsContext *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 flags, int cpu_flags, SwsVector *srcFilter, SwsVector *dstFilter, double param[2], int srcPos, int dstPos)
static void	fill_rgb2yuv_table (SwsContext *c, const int table[4], int dstRange)
static void	fill_xyztables (struct SwsContext *c)
static int	range_override_needed (enum AVPixelFormat format)
int	sws_setColorspaceDetails (struct SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)
int	sws_getColorspaceDetails (struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)
static int	handle_jpeg (enum AVPixelFormat *format)
static int	handle_0alpha (enum AVPixelFormat *format)
static int	handle_xyz (enum AVPixelFormat *format)
SwsContext *	sws_alloc_context (void)
	Allocate an empty SwsContext. More...
static uint16_t *	alloc_gamma_tbl (double e)
static enum AVPixelFormat	alphaless_fmt (enum AVPixelFormat fmt)
av_cold int	sws_init_context (SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
	Initialize the swscaler context sws_context. More...
SwsContext *	sws_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. More...
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. More...
static int	isnan_vec (SwsVector *a)
static void	makenan_vec (SwsVector *a)
SwsFilter *	sws_getDefaultFilter (float lumaGBlur, float chromaGBlur, float lumaSharpen, float chromaSharpen, float chromaHShift, float chromaVShift, int verbose)
SwsVector *	sws_allocVec (int length)
	Allocate and return an uninitialized vector with length coefficients. More...
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. More...
SwsVector *	sws_getConstVec (double c, int length)
	Allocate and return a vector with length coefficients, all with the same value c. More...
SwsVector *	sws_getIdentityVec (void)
	Allocate and return a vector with just one coefficient, with value 1.0. More...
static double	sws_dcVec (SwsVector *a)
void	sws_scaleVec (SwsVector *a, double scalar)
	Scale all the coefficients of a by the scalar value. More...
void	sws_normalizeVec (SwsVector *a, double height)
	Scale all the coefficients of a so that their sum equals height. More...
static SwsVector *	sws_getConvVec (SwsVector *a, SwsVector *b)
static SwsVector *	sws_sumVec (SwsVector *a, SwsVector *b)
static SwsVector *	sws_diffVec (SwsVector *a, SwsVector *b)
static SwsVector *	sws_getShiftedVec (SwsVector *a, int shift)
void	sws_shiftVec (SwsVector *a, int shift)
void	sws_addVec (SwsVector *a, SwsVector *b)
void	sws_subVec (SwsVector *a, SwsVector *b)
void	sws_convVec (SwsVector *a, SwsVector *b)
SwsVector *	sws_cloneVec (SwsVector *a)
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. More...
void	sws_freeVec (SwsVector *a)
void	sws_freeFilter (SwsFilter *filter)
void	sws_freeContext (SwsContext *c)
	Free the swscaler context swsContext. More...
struct SwsContext *	sws_getCachedContext (struct SwsContext *context, 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. More...

Variables
static const FormatEntry	format_entries []
static const ScaleAlgorithm	scale_algorithms []

Macro Definition Documentation

_DEFAULT_SOURCE

#define _DEFAULT_SOURCE

Definition at line 23 of file utils.c.

_SVID_SOURCE

#define _SVID_SOURCE

Definition at line 24 of file utils.c.

_DARWIN_C_SOURCE

#define _DARWIN_C_SOURCE

Definition at line 25 of file utils.c.

attribute_deprecated

#define attribute_deprecated

Definition at line 60 of file utils.c.

LICENSE_PREFIX

#define LICENSE_PREFIX   "libswscale license: "

USE_MMAP

#define USE_MMAP   0

Function Documentation

handle_formats()

static void handle_formats ( SwsContext *  c )

static

Definition at line 1083 of file utils.c.

Referenced by sws_init_context(), and sws_setColorspaceDetails().

getSplineCoeff()

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

static

Definition at line 295 of file utils.c.

Referenced by initFilter().

get_local_pos()

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

static

Definition at line 308 of file utils.c.

Referenced by sws_init_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  flags, int  cpu_flags, SwsVector *  srcFilter, SwsVector *  dstFilter, double  param[2], int  srcPos, int  dstPos  )

static

Definition at line 337 of file utils.c.

Referenced by sws_init_context().

fill_rgb2yuv_table()

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

static

dstRange &&

Definition at line 737 of file utils.c.

Referenced by sws_setColorspaceDetails().

fill_xyztables()

static void fill_xyztables ( struct SwsContext *  c )

static

Definition at line 831 of file utils.c.

Referenced by handle_formats().

range_override_needed()

static int range_override_needed ( enum AVPixelFormat  format )

static

Definition at line 867 of file utils.c.

Referenced by sws_getColorspaceDetails(), and sws_setColorspaceDetails().

handle_jpeg()

static int handle_jpeg ( enum AVPixelFormat *  format )

static

Definition at line 1025 of file utils.c.

Referenced by sws_init_context().

handle_0alpha()

static int handle_0alpha ( enum AVPixelFormat *  format )

static

Definition at line 1063 of file utils.c.

Referenced by handle_formats().

handle_xyz()

static int handle_xyz ( enum AVPixelFormat *  format )

static

Definition at line 1074 of file utils.c.

Referenced by handle_formats().

alloc_gamma_tbl()

static uint16_t* alloc_gamma_tbl ( double  e )

static

Definition at line 1107 of file utils.c.

Referenced by sws_init_context().

alphaless_fmt()

static enum AVPixelFormat alphaless_fmt ( enum AVPixelFormat  fmt )

static

Definition at line 1121 of file utils.c.

Referenced by sws_init_context().

sws_alloc_set_opts()

SwsContext* sws_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.

This is like sws_getContext() but does not perform the init step, allowing the user to set additional AVOptions.

See also

sws_getContext()

Definition at line 1892 of file utils.c.

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

isnan_vec()

static int isnan_vec ( SwsVector *  a )

static

Definition at line 1938 of file utils.c.

Referenced by sws_getDefaultFilter().

makenan_vec()

static void makenan_vec ( SwsVector *  a )

static

Definition at line 1947 of file utils.c.

Referenced by sws_addVec(), sws_convVec(), sws_shiftVec(), and sws_subVec().

sws_dcVec()

static double sws_dcVec ( SwsVector *  a )

static

Definition at line 2113 of file utils.c.

Referenced by sws_normalizeVec().

sws_getConvVec()

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

static

Definition at line 2138 of file utils.c.

Referenced by sws_convVec().

sws_sumVec()

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

static

Definition at line 2157 of file utils.c.

Referenced by sws_addVec().

sws_diffVec()

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

static

Definition at line 2175 of file utils.c.

Referenced by sws_subVec().

sws_getShiftedVec()

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

static

Definition at line 2194 of file utils.c.

Referenced by sws_shiftVec().

Variable Documentation

format_entries

const FormatEntry format_entries[]

static

Definition at line 98 of file utils.c.

Referenced by sws_isSupportedEndiannessConversion(), sws_isSupportedInput(), and sws_isSupportedOutput().

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 323 of file utils.c.

Referenced by initFilter(), and sws_init_context().