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/avutil.h"
#include "libavutil/bswap.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"

Go to the source code of this file.

Defines

#define _SVID_SOURCE

#define LICENSE_PREFIX "libswscale license: "

#define RET 0xC3

#define isSupportedIn(x)

#define isSupportedOut(x)

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, SwsVector *srcFilter, SwsVector *dstFilter, double param[2])

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

static uint16_t roundToInt16 (int64_t f)

int sws_setColorspaceDetails (SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)

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

static int handle_jpeg (enum PixelFormat *format)

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)

Allocates and returns a SwsContext.

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

SwsVector * sws_allocVec (int length)

Allocates and returns an uninitialized vector with length coefficients.

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.

SwsVector * sws_getConstVec (double c, int length)

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

SwsVector * sws_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 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)

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_printVec (SwsVector *a)

void sws_freeVec (SwsVector *a)

void sws_freeFilter (SwsFilter *filter)

void sws_freeContext (SwsContext *c)

Frees the swscaler context swsContext.

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)

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

Variables

const int32_t ff_yuv2rgb_coeffs [8][4]

Define Documentation

#define _SVID_SOURCE

Definition at line 21 of file utils.c.

#define isSupportedIn ( x )

Definition at line 66 of file utils.c.

Referenced by sws_getContext(), and sws_isSupportedInput().

#define isSupportedOut ( x )

Value:

(       \
           (x)==PIX_FMT_YUV420P     \
        || (x)==PIX_FMT_YUVA420P    \
        || (x)==PIX_FMT_YUYV422     \
        || (x)==PIX_FMT_UYVY422     \
        || (x)==PIX_FMT_YUV444P     \
        || (x)==PIX_FMT_YUV422P     \
        || (x)==PIX_FMT_YUV411P     \
        || (x)==PIX_FMT_YUVJ420P    \
        || (x)==PIX_FMT_YUVJ422P    \
        || (x)==PIX_FMT_YUVJ440P    \
        || (x)==PIX_FMT_YUVJ444P    \
        || isAnyRGB(x)              \
        || (x)==PIX_FMT_NV12        \
        || (x)==PIX_FMT_NV21        \
        || (x)==PIX_FMT_GRAY16BE    \
        || (x)==PIX_FMT_GRAY16LE    \
        || (x)==PIX_FMT_GRAY8       \
        || (x)==PIX_FMT_YUV410P     \
        || (x)==PIX_FMT_YUV440P     \
        || (x)==PIX_FMT_YUV420P16LE   \
        || (x)==PIX_FMT_YUV422P16LE   \
        || (x)==PIX_FMT_YUV444P16LE   \
        || (x)==PIX_FMT_YUV420P16BE   \
        || (x)==PIX_FMT_YUV422P16BE   \
        || (x)==PIX_FMT_YUV444P16BE   \
    )

Definition at line 118 of file utils.c.

Referenced by sws_getContext(), and sws_isSupportedOutput().

#define LICENSE_PREFIX "libswscale license: "

#define RET 0xC3

Definition at line 64 of file utils.c.

Function Documentation

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

Definition at line 161 of file utils.c.

Referenced by initFilter().

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

Definition at line 669 of file utils.c.

Referenced by sws_getContext().

static int handle_jpeg ( enum PixelFormat * format ) [static]

Definition at line 762 of file utils.c.

Referenced by sws_getContext().

static int initFilter	(	int16_t **	outFilter,
		int16_t **	filterPos,
		int *	outFilterSize,
		int	xInc,
		int	srcW,
		int	dstW,
		int	filterAlign,
		int	one,
		int	flags,
		SwsVector *	srcFilter,
		SwsVector *	dstFilter,
		double	param[2]
	)			`[static]`

Definition at line 172 of file utils.c.

Referenced by sws_getContext().

static uint16_t roundToInt16 ( int64_t f ) [static]

Definition at line 675 of file utils.c.

Referenced by sws_setColorspaceDetails().

void sws_addVec	(	SwsVector *	a,
		SwsVector *	b
	)

Definition at line 1415 of file utils.c.

Referenced by sws_getDefaultFilter().

SwsVector* sws_allocVec ( int length )

Allocates and returns an uninitialized vector with length coefficients.

Definition at line 1266 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 1442 of file utils.c.

void sws_convVec	(	SwsVector *	a,
		SwsVector *	b
	)

Definition at line 1433 of file utils.c.

static double sws_dcVec ( SwsVector * a ) [static]

Definition at line 1317 of file utils.c.

Referenced by sws_normalizeVec().

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

Definition at line 1374 of file utils.c.

Referenced by sws_subVec().

const char* sws_format_name ( enum PixelFormat format )

Definition at line 153 of file utils.c.

Referenced by doTest(), ff_yuv2packedX_altivec(), ff_yuv2rgb_get_func_ptr(), ff_yuv2rgb_get_func_ptr_bfin(), palToRgbWrapper(), rgbToRgbWrapper(), selfTest(), and sws_getContext().

void sws_freeContext ( struct SwsContext * swsContext )

Frees the swscaler context swsContext.

If swsContext is NULL, then does nothing.

Definition at line 1504 of file utils.c.

Referenced by do_video_out(), doTest(), main(), stream_close(), sws_getCachedContext(), sws_getContext(), and uninit().

void sws_freeFilter ( SwsFilter * filter )

Definition at line 1493 of file utils.c.

void sws_freeVec ( SwsVector * a )

Definition at line 1485 of file utils.c.

Referenced by 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 1561 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 747 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 1298 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

Definition at line 782 of file utils.c.

Referenced by av_transcode(), config_props(), do_video_out(), doTest(), main(), sws_getCachedContext(), and write_video_frame().

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

Definition at line 1341 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 1206 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 1278 of file utils.c.

Referenced by sws_getDefaultFilter().

SwsVector* sws_getIdentityVec ( void )

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

Definition at line 1312 of file utils.c.

Referenced by sws_getDefaultFilter().

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

Definition at line 1390 of file utils.c.

Referenced by sws_shiftVec().

int sws_isSupportedInput ( enum PixelFormat pix_fmt )

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

Definition at line 113 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 146 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 1336 of file utils.c.

Referenced by sws_getDefaultFilter(), and sws_getGaussianVec().

void sws_printVec ( SwsVector * a )

Deprecated:: Use sws_printVec2() instead.

Definition at line 1479 of file utils.c.

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 1455 of file utils.c.

Referenced by sws_getDefaultFilter(), and sws_printVec().

void sws_scaleVec	(	SwsVector *	a,
		double	scalar
	)

Scales all the coefficients of a by the scalar value.

Definition at line 1328 of file utils.c.

Referenced by 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]
	fullRange	if 1 then the luma range is 0..255 if 0 it is 16..235

Returns:: -1 if not supported

Definition at line 683 of file utils.c.

Referenced by sws_getContext().

void sws_shiftVec	(	SwsVector *	a,
		int	shift
	)

Definition at line 1406 of file utils.c.

Referenced by sws_getDefaultFilter().

void sws_subVec	(	SwsVector *	a,
		SwsVector *	b
	)

Definition at line 1424 of file utils.c.

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

Definition at line 1359 of file utils.c.

Referenced by sws_addVec().

const char* swscale_configuration ( void )

Returns the libswscale build-time configuration.

Definition at line 53 of file utils.c.

Referenced by show_banner().

const char* swscale_license ( void )

Returns the libswscale license.

Definition at line 58 of file utils.c.

unsigned swscale_version ( void )

Returns the LIBSWSCALE_VERSION_INT constant.

Definition at line 48 of file utils.c.

Variable Documentation

const int32_t ff_yuv2rgb_coeffs[8][4]

Definition at line 43 of file yuv2rgb.c.

Referenced by sws_getCoefficients(), and sws_getContext().


Defines
#define	_SVID_SOURCE
#define	LICENSE_PREFIX "libswscale license: "
#define	RET 0xC3
#define	isSupportedIn(x)
#define	isSupportedOut(x)
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, SwsVector srcFilter, SwsVector *dstFilter, double param[2])
static void	getSubSampleFactors (int h, int v, enum PixelFormat format)
static uint16_t	roundToInt16 (int64_t f)
int	sws_setColorspaceDetails (SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)
int	sws_getColorspaceDetails (SwsContext c, int inv_table, int srcRange, int *table, int dstRange, int brightness, int contrast, int *saturation)
static int	handle_jpeg (enum PixelFormat *format)
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)
	Allocates and returns a SwsContext.
SwsFilter *	sws_getDefaultFilter (float lumaGBlur, float chromaGBlur, float lumaSharpen, float chromaSharpen, float chromaHShift, float chromaVShift, int verbose)
SwsVector *	sws_allocVec (int length)
	Allocates and returns an uninitialized vector with length coefficients.
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.
SwsVector *	sws_getConstVec (double c, int length)
	Allocates and returns a vector with length coefficients, all with the same value c.
SwsVector *	sws_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 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)
	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_printVec (SwsVector *a)
void	sws_freeVec (SwsVector *a)
void	sws_freeFilter (SwsFilter *filter)
void	sws_freeContext (SwsContext *c)
	Frees the swscaler context swsContext.
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)
	Checks if context can be reused, otherwise reallocates a new one.
Variables
const int32_t	ff_yuv2rgb_coeffs [8][4]