libswscale/utils.c File Reference

#include <inttypes.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
#include "config.h"
#include <assert.h>
#include "swscale.h"
#include "swscale_internal.h"
#include "rgb2rgb.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/x86_cpu.h"
#include "libavutil/cpu.h"
#include "libavutil/avutil.h"
#include "libavutil/bswap.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/avassert.h"

Go to the source code of this file.

Data Structures

struct  FormatEntry

Defines

#define _SVID_SOURCE
#define _DARWIN_C_SOURCE
#define LICENSE_PREFIX   "libswscale license: "
#define RET   0xC3

Functions

unsigned swscale_version (void)
 Returns the LIBSWSCALE_VERSION_INT constant.
const char * swscale_configuration (void)
 Returns the libswscale build-time configuration.
const char * swscale_license (void)
 Returns the libswscale license.
int sws_isSupportedInput (enum PixelFormat pix_fmt)
 Returns a positive value if pix_fmt is a supported input format, 0 otherwise.
int sws_isSupportedOutput (enum PixelFormat pix_fmt)
 Returns a positive value if pix_fmt is a supported output format, 0 otherwise.
const char * sws_format_name (enum PixelFormat format)
static double getSplineCoeff (double a, double b, double c, double d, double dist)
static int initFilter (int16_t **outFilter, int16_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])
static void getSubSampleFactors (int *h, int *v, enum PixelFormat 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 PixelFormat *format)
SwsContextsws_alloc_context (void)
 Allocates an empty SwsContext.
int sws_init_context (SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)
 Initializes the swscaler context sws_context.
SwsContextsws_getContext (int srcW, int srcH, enum PixelFormat srcFormat, int dstW, int dstH, enum PixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
 Allocates and returns a SwsContext.
SwsFiltersws_getDefaultFilter (float lumaGBlur, float chromaGBlur, float lumaSharpen, float chromaSharpen, float chromaHShift, float chromaVShift, int verbose)
SwsVectorsws_allocVec (int length)
 Allocates and returns an uninitialized vector with length coefficients.
SwsVectorsws_getGaussianVec (double variance, double quality)
 Returns a normalized Gaussian curve used to filter stuff quality=3 is high quality, lower is lower quality.
SwsVectorsws_getConstVec (double c, int length)
 Allocates and returns a vector with length coefficients, all with the same value c.
SwsVectorsws_getIdentityVec (void)
 Allocates and returns a vector with just one coefficient, with value 1.0.
static double sws_dcVec (SwsVector *a)
void sws_scaleVec (SwsVector *a, double scalar)
 Scales all the coefficients of a by the scalar value.
void sws_normalizeVec (SwsVector *a, double height)
 Scales all the coefficients of a so that their sum equals height.
static SwsVectorsws_getConvVec (SwsVector *a, SwsVector *b)
static SwsVectorsws_sumVec (SwsVector *a, SwsVector *b)
static SwsVectorsws_diffVec (SwsVector *a, SwsVector *b)
static SwsVectorsws_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)
SwsVectorsws_cloneVec (SwsVector *a)
 Allocates and returns 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)
 Prints 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)
 Frees the swscaler context swsContext.
struct SwsContextsws_getCachedContext (struct SwsContext *context, int srcW, int srcH, enum PixelFormat srcFormat, int dstW, int dstH, enum PixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
 Checks if context can be reused, otherwise reallocates a new one.

Variables

static const FormatEntry format_entries [PIX_FMT_NB]
const int32_t ff_yuv2rgb_coeffs [8][4]


Define Documentation

#define _DARWIN_C_SOURCE

Definition at line 22 of file utils.c.

#define _SVID_SOURCE

Definition at line 21 of file utils.c.

#define LICENSE_PREFIX   "libswscale license: "

#define RET   0xC3

Definition at line 68 of file utils.c.


Function Documentation

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

Definition at line 183 of file utils.c.

Referenced by initFilter().

static void getSubSampleFactors ( int *  h,
int *  v,
enum PixelFormat  format 
) [static]

Definition at line 695 of file utils.c.

static int handle_jpeg ( enum PixelFormat format  )  [static]

Definition at line 743 of file utils.c.

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

static int initFilter ( int16_t **  outFilter,
int16_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] 
) [static]

Definition at line 193 of file utils.c.

Referenced by sws_init_context().

void sws_addVec ( SwsVector a,
SwsVector b 
)

Definition at line 1366 of file utils.c.

Referenced by sws_getDefaultFilter().

SwsContext* sws_alloc_context ( void   )  [read]

Allocates an empty SwsContext.

This must be filled and passed to sws_init_context(). For filling see AVOptions, options.c and sws_setColorspaceDetails().

Definition at line 758 of file utils.c.

Referenced by sws_getCachedContext(), and sws_getContext().

SwsVector* sws_allocVec ( int  length  ) 

Allocates and returns an uninitialized vector with length coefficients.

Definition at line 1217 of file utils.c.

Referenced by sws_cloneVec(), sws_getConstVec(), and sws_getGaussianVec().

SwsVector* sws_cloneVec ( SwsVector a  ) 

Allocates and returns a clone of the vector a, that is a vector with the same coefficients as a.

Definition at line 1393 of file utils.c.

void sws_convVec ( SwsVector a,
SwsVector b 
)

Definition at line 1384 of file utils.c.

static double sws_dcVec ( SwsVector a  )  [static]

Definition at line 1268 of file utils.c.

Referenced by sws_normalizeVec().

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

Definition at line 1325 of file utils.c.

Referenced by sws_subVec().

const char* sws_format_name ( enum PixelFormat  format  ) 

Definition at line 177 of file utils.c.

void sws_freeContext ( struct SwsContext swsContext  ) 

Frees the swscaler context swsContext.

If swsContext is NULL, then does nothing.

Definition at line 1448 of file utils.c.

Referenced by config_props(), do_video_resample(), doTest(), freeBuffers(), main(), stream_close(), sws_getCachedContext(), sws_getContext(), transcode(), uninit(), and uninit_opts().

void sws_freeFilter ( SwsFilter filter  ) 

Definition at line 1437 of file utils.c.

void sws_freeVec ( SwsVector a  ) 

Definition at line 1429 of file utils.c.

Referenced by allocStuff(), sws_freeFilter(), and sws_getDefaultFilter().

struct SwsContext* sws_getCachedContext ( struct SwsContext context,
int  srcW,
int  srcH,
enum PixelFormat  srcFormat,
int  dstW,
int  dstH,
enum PixelFormat  dstFormat,
int  flags,
SwsFilter srcFilter,
SwsFilter dstFilter,
const double *  param 
) [read]

Checks if context can be reused, otherwise reallocates a new one.

If context is NULL, just calls sws_getContext() to get a new context. Otherwise, checks if the parameters are the ones already saved in context. If that is the case, returns the current context. Otherwise, frees context and gets a new context with the new parameters.

Be warned that srcFilter and dstFilter are not checked, they are assumed to remain the same.

Definition at line 1507 of file utils.c.

Referenced by queue_picture().

int sws_getColorspaceDetails ( struct SwsContext c,
int **  inv_table,
int *  srcRange,
int **  table,
int *  dstRange,
int *  brightness,
int *  contrast,
int *  saturation 
)

Returns:
-1 if not supported

Definition at line 726 of file utils.c.

SwsVector* sws_getConstVec ( double  c,
int  length 
)

Allocates and returns a vector with length coefficients, all with the same value c.

Definition at line 1249 of file utils.c.

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

SwsContext* sws_getContext ( int  srcW,
int  srcH,
enum PixelFormat  srcFormat,
int  dstW,
int  dstH,
enum PixelFormat  dstFormat,
int  flags,
SwsFilter srcFilter,
SwsFilter dstFilter,
const double *  param 
) [read]

Allocates and returns a SwsContext.

You need it to perform scaling/conversion operations using sws_scale().

Parameters:
srcW the width of the source image
srcH the height of the source image
srcFormat the source image format
dstW the width of the destination image
dstH the height of the destination image
dstFormat the destination image format
flags specify which algorithm and options to use for rescaling
Returns:
a pointer to an allocated context, or NULL in case of error
Note:
this function is to be removed after a saner alternative is written
Deprecated:
Use sws_getCachedContext() instead.

Definition at line 1123 of file utils.c.

Referenced by allocStuff(), config_props(), do_video_resample(), doTest(), init_opts(), main(), sws_getContextFromCmdLine(), and write_video_frame().

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

Definition at line 1292 of file utils.c.

Referenced by sws_convVec().

SwsFilter* sws_getDefaultFilter ( float  lumaGBlur,
float  chromaGBlur,
float  lumaSharpen,
float  chromaSharpen,
float  chromaHShift,
float  chromaVShift,
int  verbose 
)

Definition at line 1157 of file utils.c.

SwsVector* sws_getGaussianVec ( double  variance,
double  quality 
)

Returns a normalized Gaussian curve used to filter stuff quality=3 is high quality, lower is lower quality.

Definition at line 1229 of file utils.c.

Referenced by allocStuff(), and sws_getDefaultFilter().

SwsVector* sws_getIdentityVec ( void   ) 

Allocates and returns a vector with just one coefficient, with value 1.0.

Definition at line 1263 of file utils.c.

Referenced by sws_getDefaultFilter().

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

Definition at line 1341 of file utils.c.

Referenced by sws_shiftVec().

int sws_init_context ( struct SwsContext sws_context,
SwsFilter srcFilter,
SwsFilter dstFilter 
)

Initializes the swscaler context sws_context.

Returns:
zero or positive value on success, a negative value on error

Definition at line 768 of file utils.c.

Referenced by sws_getCachedContext(), and sws_getContext().

int sws_isSupportedInput ( enum PixelFormat  pix_fmt  ) 

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

Definition at line 162 of file utils.c.

int sws_isSupportedOutput ( enum PixelFormat  pix_fmt  ) 

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

Definition at line 168 of file utils.c.

void sws_normalizeVec ( SwsVector a,
double  height 
)

Scales all the coefficients of a so that their sum equals height.

Definition at line 1287 of file utils.c.

Referenced by sws_getDefaultFilter(), and sws_getGaussianVec().

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

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

Definition at line 1406 of file utils.c.

Referenced by sws_getDefaultFilter().

void sws_scaleVec ( SwsVector a,
double  scalar 
)

Scales all the coefficients of a by the scalar value.

Definition at line 1279 of file utils.c.

Referenced by allocStuff(), sws_getDefaultFilter(), and sws_normalizeVec().

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 
)

Parameters:
inv_table the yuv2rgb coefficients, normally ff_yuv2rgb_coeffs[x]
Returns:
-1 if not supported

Definition at line 701 of file utils.c.

Referenced by sws_getCachedContext(), and sws_getContext().

void sws_shiftVec ( SwsVector a,
int  shift 
)

Definition at line 1357 of file utils.c.

Referenced by sws_getDefaultFilter().

void sws_subVec ( SwsVector a,
SwsVector b 
)

Definition at line 1375 of file utils.c.

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

Definition at line 1310 of file utils.c.

Referenced by sws_addVec().

const char* swscale_configuration ( void   ) 

Returns the libswscale build-time configuration.

Definition at line 57 of file utils.c.

const char* swscale_license ( void   ) 

Returns the libswscale license.

Definition at line 62 of file utils.c.

unsigned swscale_version ( void   ) 

Returns the LIBSWSCALE_VERSION_INT constant.

Definition at line 52 of file utils.c.


Variable Documentation

const int32_t ff_yuv2rgb_coeffs[8][4]

Definition at line 44 of file yuv2rgb.c.

Referenced by sws_getCachedContext(), sws_getCoefficients(), and sws_getContext().

const FormatEntry format_entries[PIX_FMT_NB] [static]

Definition at line 74 of file utils.c.


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