FFmpeg: libswscale/utils.c File Reference

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libswscale

Data Structures | Macros | Functions | Variables

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/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.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 _SVID_SOURCE

#define _DARWIN_C_SOURCE

#define LICENSE_PREFIX "libswscale license: "

#define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

Functions

static void handle_formats (SwsContext *c)

unsigned swscale_version (void)

const char * swscale_configuration (void)

Return the libswscale build-time configuration.

const char * swscale_license (void)

Return the libswscale license.

int sws_isSupportedInput (enum AVPixelFormat pix_fmt)

Return a positive value if pix_fmt is a supported input format, 0 otherwise.

int sws_isSupportedOutput (enum AVPixelFormat pix_fmt)

Return a positive value if pix_fmt is a supported output format, 0 otherwise.

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)

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.

av_cold int sws_init_context (SwsContext *c, 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.

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.

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.

SwsVector * sws_getConstVec (double c, int length)

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

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_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)

Allocate and return a clone of the vector a, that is a vector with the same coefficients as 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.

void sws_freeVec (SwsVector *a)

void sws_freeFilter (SwsFilter *filter)

void sws_freeContext (SwsContext *c)

Free the swscaler context swsContext.

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.

Variables

static const FormatEntry format_entries [AV_PIX_FMT_NB]

static const ScaleAlgorithm scale_algorithms []

Macro Definition Documentation

#define _SVID_SOURCE

Definition at line 23 of file utils.c.

#define _DARWIN_C_SOURCE

Definition at line 24 of file utils.c.

#define LICENSE_PREFIX "libswscale license: "

#define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

Function Documentation

static void handle_formats ( SwsContext * c )

static

Definition at line 939 of file utils.c.

Referenced by sws_init_context(), and sws_setColorspaceDetails().

static double getSplineCoeff ( double a,

double b,

double c,

double d,

double dist

)

static

Definition at line 244 of file utils.c.

Referenced by initFilter().

static av_cold int get_local_pos ( SwsContext * s,

int chr_subsample,

int pos,

int dir

)

static

Definition at line 257 of file utils.c.

Referenced by sws_init_context().

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 286 of file utils.c.

Referenced by sws_init_context().

static void fill_rgb2yuv_table ( SwsContext * c,

const int table[4],

int dstRange

)

static

dstRange &&

Definition at line 691 of file utils.c.

Referenced by sws_setColorspaceDetails().

static void fill_xyztables ( struct SwsContext * c )

static

Definition at line 785 of file utils.c.

Referenced by handle_formats().

static int handle_jpeg ( enum AVPixelFormat * format )

static

Definition at line 892 of file utils.c.

Referenced by sws_init_context().

static int handle_0alpha ( enum AVPixelFormat * format )

static

Definition at line 919 of file utils.c.

Referenced by handle_formats().

static int handle_xyz ( enum AVPixelFormat * format )

static

Definition at line 930 of file utils.c.

Referenced by handle_formats().

static double sws_dcVec ( SwsVector * a )

static

Definition at line 1719 of file utils.c.

Referenced by sws_normalizeVec().

static SwsVector* sws_getConvVec ( SwsVector * a,

SwsVector * b

)

static

Definition at line 1743 of file utils.c.

Referenced by sws_convVec().

static SwsVector* sws_sumVec ( SwsVector * a,

SwsVector * b

)

static

Definition at line 1761 of file utils.c.

Referenced by sws_addVec().

static SwsVector* sws_diffVec ( SwsVector * a,

SwsVector * b

)

static

Definition at line 1778 of file utils.c.

Referenced by sws_subVec().

static SwsVector* sws_getShiftedVec ( SwsVector * a,

int shift

)

static

Definition at line 1796 of file utils.c.

Referenced by sws_shiftVec().

Variable Documentation

const FormatEntry format_entries[AV_PIX_FMT_NB]

static

Definition at line 82 of file utils.c.

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 272 of file utils.c.

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