libswscale/swscale.h File Reference

external api for the swscale stuff More...

#include "libavutil/avutil.h"
#include "libavutil/log.h"
#include "libavutil/pixfmt.h"

Go to the source code of this file.

Data Structures

struct SwsVector

struct SwsFilter

Defines

#define LIBSWSCALE_VERSION_MAJOR   2

#define LIBSWSCALE_VERSION_MINOR   1

#define LIBSWSCALE_VERSION_MICRO   0

#define LIBSWSCALE_VERSION_INT

#define LIBSWSCALE_VERSION

#define LIBSWSCALE_BUILD   LIBSWSCALE_VERSION_INT

#define LIBSWSCALE_IDENT   "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)

#define FF_API_SWS_GETCONTEXT   (LIBSWSCALE_VERSION_MAJOR < 3)

Those FF_API_* defines are not part of public API.

#define FF_API_SWS_CPU_CAPS   (LIBSWSCALE_VERSION_MAJOR < 3)

#define FF_API_SWS_FORMAT_NAME   (LIBSWSCALE_VERSION_MAJOR < 3)

#define SWS_FAST_BILINEAR   1

#define SWS_BILINEAR   2

#define SWS_BICUBIC   4

#define SWS_X   8

#define SWS_POINT   0x10

#define SWS_AREA   0x20

#define SWS_BICUBLIN   0x40

#define SWS_GAUSS   0x80

#define SWS_SINC   0x100

#define SWS_LANCZOS   0x200

#define SWS_SPLINE   0x400

#define SWS_SRC_V_CHR_DROP_MASK   0x30000

#define SWS_SRC_V_CHR_DROP_SHIFT   16

#define SWS_PARAM_DEFAULT   123456

#define SWS_PRINT_INFO   0x1000

#define SWS_FULL_CHR_H_INT   0x2000

#define SWS_FULL_CHR_H_INP   0x4000

#define SWS_DIRECT_BGR   0x8000

#define SWS_ACCURATE_RND   0x40000

#define SWS_BITEXACT   0x80000

#define SWS_CPU_CAPS_MMX   0x80000000

CPU caps are autodetected now, those flags are only provided for API compatibility.

#define SWS_CPU_CAPS_MMX2   0x20000000

#define SWS_CPU_CAPS_3DNOW   0x40000000

#define SWS_CPU_CAPS_ALTIVEC   0x10000000

#define SWS_CPU_CAPS_BFIN   0x01000000

#define SWS_CPU_CAPS_SSE2   0x02000000

#define SWS_MAX_REDUCE_CUTOFF   0.002

#define SWS_CS_ITU709   1

#define SWS_CS_FCC   4

#define SWS_CS_ITU601   5

#define SWS_CS_ITU624   5

#define SWS_CS_SMPTE170M   5

#define SWS_CS_SMPTE240M   7

#define SWS_CS_DEFAULT   5

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.

const int * sws_getCoefficients (int colorspace)

Returns a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDetails().

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.

struct SwsContext * sws_alloc_context (void)

Allocates an empty SwsContext.

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

Initializes the swscaler context sws_context.

void sws_freeContext (struct SwsContext *swsContext)

Frees the swscaler context swsContext.

struct 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.

int sws_scale (struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])

Scales the image slice in srcSlice and puts the resulting scaled slice in the image in dst.

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)

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.

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.

void sws_convVec (SwsVector *a, SwsVector *b)

void sws_addVec (SwsVector *a, SwsVector *b)

void sws_subVec (SwsVector *a, SwsVector *b)

void sws_shiftVec (SwsVector *a, int shift)

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_freeVec (SwsVector *a)

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

void sws_freeFilter (SwsFilter *filter)

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.

void sws_convertPalette8ToPacked32 (const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

Converts an 8bit paletted frame into a frame with a color depth of 32-bits.

void sws_convertPalette8ToPacked24 (const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette)

Converts an 8bit paletted frame into a frame with a color depth of 24 bits.

const AVClass * sws_get_class (void)

Get the AVClass for swsContext.

Detailed Description

external api for the swscale stuff

Definition in file swscale.h.

Define Documentation

#define FF_API_SWS_CPU_CAPS (LIBSWSCALE_VERSION_MAJOR < 3)

Definition at line 56 of file swscale.h.

#define FF_API_SWS_FORMAT_NAME (LIBSWSCALE_VERSION_MAJOR < 3)

Definition at line 59 of file swscale.h.

#define FF_API_SWS_GETCONTEXT (LIBSWSCALE_VERSION_MAJOR < 3)

Those FF_API_* defines are not part of public API.

They may change, break or disappear at any time.

Definition at line 53 of file swscale.h.

#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT

Definition at line 44 of file swscale.h.

#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)

Definition at line 46 of file swscale.h.

#define LIBSWSCALE_VERSION

Value:

AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
                                           LIBSWSCALE_VERSION_MINOR, \
                                           LIBSWSCALE_VERSION_MICRO)

Definition at line 41 of file swscale.h.

#define LIBSWSCALE_VERSION_INT

Value:

AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
                                               LIBSWSCALE_VERSION_MINOR, \
                                               LIBSWSCALE_VERSION_MICRO)

Definition at line 38 of file swscale.h.

Referenced by swscale_version().

#define LIBSWSCALE_VERSION_MAJOR 2

Definition at line 34 of file swscale.h.

#define LIBSWSCALE_VERSION_MICRO 0

Definition at line 36 of file swscale.h.

#define LIBSWSCALE_VERSION_MINOR 1

Definition at line 35 of file swscale.h.

#define SWS_ACCURATE_RND 0x40000

Definition at line 103 of file swscale.h.

Referenced by DECLARE_ASM_CONST(), ff_get_unscaled_swscale(), ff_sws_init_swScale_mmx(), initFilter(), and sws_init_swScale_TMPL().

#define SWS_AREA 0x20

Definition at line 83 of file swscale.h.

Referenced by initFilter(), selfTest(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_BICUBIC 4

Definition at line 80 of file swscale.h.

Referenced by allocStuff(), init_opts(), initFilter(), selfTest(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_BICUBLIN 0x40

Definition at line 84 of file swscale.h.

Referenced by sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_BILINEAR 2

Definition at line 79 of file swscale.h.

Referenced by doTest(), init(), initFilter(), main(), selfTest(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_BITEXACT 0x80000

Definition at line 104 of file swscale.h.

Referenced by ff_get_unscaled_swscale(), ff_sws_init_swScale_altivec(), ff_swscale_get_unscaled_altivec(), and initFilter().

#define SWS_CPU_CAPS_3DNOW 0x40000000

Definition at line 113 of file swscale.h.

#define SWS_CPU_CAPS_ALTIVEC 0x10000000

Definition at line 114 of file swscale.h.

#define SWS_CPU_CAPS_BFIN 0x01000000

Definition at line 115 of file swscale.h.

#define SWS_CPU_CAPS_MMX 0x80000000

CPU caps are autodetected now, those flags are only provided for API compatibility.

Definition at line 111 of file swscale.h.

#define SWS_CPU_CAPS_MMX2 0x20000000

Definition at line 112 of file swscale.h.

#define SWS_CPU_CAPS_SSE2 0x02000000

Definition at line 116 of file swscale.h.

#define SWS_CS_DEFAULT 5

Definition at line 127 of file swscale.h.

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

#define SWS_CS_FCC 4

Definition at line 122 of file swscale.h.

#define SWS_CS_ITU601 5

Definition at line 123 of file swscale.h.

#define SWS_CS_ITU624 5

Definition at line 124 of file swscale.h.

#define SWS_CS_ITU709 1

Definition at line 121 of file swscale.h.

#define SWS_CS_SMPTE170M 5

Definition at line 125 of file swscale.h.

#define SWS_CS_SMPTE240M 7

Definition at line 126 of file swscale.h.

#define SWS_DIRECT_BGR 0x8000

Definition at line 102 of file swscale.h.

#define SWS_FAST_BILINEAR 1

Definition at line 78 of file swscale.h.

Referenced by ff_get_unscaled_swscale(), initFilter(), selfTest(), sws_getFlagsAndFilterFromCmdLine(), sws_init_context(), and sws_init_swScale_c().

#define SWS_FULL_CHR_H_INP 0x4000

Definition at line 101 of file swscale.h.

Referenced by sws_init_context().

#define SWS_FULL_CHR_H_INT 0x2000

Definition at line 99 of file swscale.h.

Referenced by ff_sws_init_swScale_altivec(), find_c_packed_planar_out_funcs(), sws_init_context(), and sws_init_swScale_TMPL().

#define SWS_GAUSS 0x80

Definition at line 85 of file swscale.h.

Referenced by initFilter(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_LANCZOS 0x200

Definition at line 87 of file swscale.h.

Referenced by initFilter(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_MAX_REDUCE_CUTOFF 0.002

Definition at line 119 of file swscale.h.

Referenced by initFilter().

#define SWS_PARAM_DEFAULT 123456

Definition at line 93 of file swscale.h.

Referenced by initFilter(), and sws_getCachedContext().

#define SWS_POINT 0x10

Definition at line 82 of file swscale.h.

Referenced by allocStuff(), ff_get_unscaled_swscale(), initFilter(), selfTest(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_PRINT_INFO 0x1000

Definition at line 95 of file swscale.h.

Referenced by initFilter(), sws_getFlagsAndFilterFromCmdLine(), sws_init_context(), and swScale().

#define SWS_SINC 0x100

Definition at line 86 of file swscale.h.

Referenced by initFilter(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_SPLINE 0x400

Definition at line 88 of file swscale.h.

Referenced by initFilter(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

#define SWS_SRC_V_CHR_DROP_MASK 0x30000

Definition at line 90 of file swscale.h.

Referenced by sws_init_context().

#define SWS_SRC_V_CHR_DROP_SHIFT 16

Definition at line 91 of file swscale.h.

Referenced by sws_init_context().

#define SWS_X 8

Definition at line 81 of file swscale.h.

Referenced by initFilter(), selfTest(), sws_getFlagsAndFilterFromCmdLine(), and sws_init_context().

Function Documentation

void sws_addVec	(	SwsVector *	a,
		SwsVector *	b
	)

Definition at line 1366 of file utils.c.

Referenced by sws_getDefaultFilter().

struct 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_convertPalette8ToPacked24	(	const uint8_t *	src,
		uint8_t *	dst,
		int	num_pixels,
		const uint8_t *	palette
	)

Converts an 8bit paletted frame into a frame with a color depth of 24 bits.

With the palette format "ABCD", the destination frame ends up with the format "ABC".

Parameters:

	src	source frame buffer
	dst	destination frame buffer
	num_pixels	number of pixels to convert
	palette	array with [256] entries, which must match color arrangement (RGB or BGR) of src

Definition at line 935 of file swscale_unscaled.c.

Referenced by palToRgbWrapper(), and put_image().

void sws_convertPalette8ToPacked32	(	const uint8_t *	src,
		uint8_t *	dst,
		int	num_pixels,
		const uint8_t *	palette
	)

Converts an 8bit paletted frame into a frame with a color depth of 32-bits.

The output frame will have the same packed format as the palette.

Parameters:

	src	source frame buffer
	dst	destination frame buffer
	num_pixels	number of pixels to convert
	palette	array with [256] entries, which must match color arrangement (RGB or BGR) of src

Definition at line 926 of file swscale_unscaled.c.

Referenced by palToRgbWrapper(), and put_image().

void sws_convVec	(	SwsVector *	a,
		SwsVector *	b
	)

Definition at line 1384 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().

const AVClass* sws_get_class ( void )

Get the AVClass for swsContext.

It can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options.

See also:: av_opt_find().

Definition at line 71 of file options.c.

Referenced by opt_default(), and opt_help().

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().

const int* sws_getCoefficients ( int colorspace )

Returns a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDetails().

Parameters:

colorspace

One of the SWS_CS_* macros. If invalid, SWS_CS_DEFAULT is used.

Definition at line 55 of file yuv2rgb.c.

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().

struct 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().

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().

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().

int sws_scale	(	struct SwsContext *	c,
		const uint8_t *const	srcSlice[],
		const int	srcStride[],
		int	srcSliceY,
		int	srcSliceH,
		uint8_t *const	dst[],
		const int	dstStride[]
	)

Scales the image slice in srcSlice and puts the resulting scaled slice in the image in dst.

A slice is a sequence of consecutive rows in an image.

Slices have to be provided in sequential order, either in top-bottom or bottom-top order. If slices are provided in non-sequential order the behavior of the function is undefined.

Parameters:

	c	the scaling context previously created with sws_getContext()
	srcSlice	the array containing the pointers to the planes of the source slice
	srcStride	the array containing the strides for each plane of the source image
	srcSliceY	the position in the source image of the slice to process, that is the number (counted starting from zero) in the image of the first row of the slice
	srcSliceH	the height of the source slice, that is the number of rows in the slice
	dst	the array containing the pointers to the planes of the destination image
	dstStride	the array containing the strides for each plane of the destination image

Returns:: the height of the output slice

Scales the image slice in srcSlice and puts the resulting scaled slice in the image in dst.

Assumes planar YUV to be in YUV order instead of YVU.

Definition at line 793 of file swscale_unscaled.c.

Referenced by blur(), do_video_resample(), doTest(), draw_slice(), main(), queue_picture(), scale_image(), scale_slice(), and write_video_frame().

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.

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.


Data Structures
struct	SwsVector
struct	SwsFilter
Defines
#define	LIBSWSCALE_VERSION_MAJOR 2
#define	LIBSWSCALE_VERSION_MINOR 1
#define	LIBSWSCALE_VERSION_MICRO 0
#define	LIBSWSCALE_VERSION_INT
#define	LIBSWSCALE_VERSION
#define	LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT
#define	LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)
#define	FF_API_SWS_GETCONTEXT (LIBSWSCALE_VERSION_MAJOR < 3)
	Those FF_API_* defines are not part of public API.
#define	FF_API_SWS_CPU_CAPS (LIBSWSCALE_VERSION_MAJOR < 3)
#define	FF_API_SWS_FORMAT_NAME (LIBSWSCALE_VERSION_MAJOR < 3)
#define	SWS_FAST_BILINEAR 1
#define	SWS_BILINEAR 2
#define	SWS_BICUBIC 4
#define	SWS_X 8
#define	SWS_POINT 0x10
#define	SWS_AREA 0x20
#define	SWS_BICUBLIN 0x40
#define	SWS_GAUSS 0x80
#define	SWS_SINC 0x100
#define	SWS_LANCZOS 0x200
#define	SWS_SPLINE 0x400
#define	SWS_SRC_V_CHR_DROP_MASK 0x30000
#define	SWS_SRC_V_CHR_DROP_SHIFT 16
#define	SWS_PARAM_DEFAULT 123456
#define	SWS_PRINT_INFO 0x1000
#define	SWS_FULL_CHR_H_INT 0x2000
#define	SWS_FULL_CHR_H_INP 0x4000
#define	SWS_DIRECT_BGR 0x8000
#define	SWS_ACCURATE_RND 0x40000
#define	SWS_BITEXACT 0x80000
#define	SWS_CPU_CAPS_MMX 0x80000000
	CPU caps are autodetected now, those flags are only provided for API compatibility.
#define	SWS_CPU_CAPS_MMX2 0x20000000
#define	SWS_CPU_CAPS_3DNOW 0x40000000
#define	SWS_CPU_CAPS_ALTIVEC 0x10000000
#define	SWS_CPU_CAPS_BFIN 0x01000000
#define	SWS_CPU_CAPS_SSE2 0x02000000
#define	SWS_MAX_REDUCE_CUTOFF 0.002
#define	SWS_CS_ITU709 1
#define	SWS_CS_FCC 4
#define	SWS_CS_ITU601 5
#define	SWS_CS_ITU624 5
#define	SWS_CS_SMPTE170M 5
#define	SWS_CS_SMPTE240M 7
#define	SWS_CS_DEFAULT 5
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.
const int *	sws_getCoefficients (int colorspace)
	Returns a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDetails().
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.
struct SwsContext *	sws_alloc_context (void)
	Allocates an empty SwsContext.
int	sws_init_context (struct SwsContext sws_context, SwsFilter srcFilter, SwsFilter *dstFilter)
	Initializes the swscaler context sws_context.
void	sws_freeContext (struct SwsContext *swsContext)
	Frees the swscaler context swsContext.
struct 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.
int	sws_scale (struct SwsContext c, const uint8_t const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
	Scales the image slice in srcSlice and puts the resulting scaled slice in the image in dst.
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)
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.
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.
void	sws_convVec (SwsVector a, SwsVector b)
void	sws_addVec (SwsVector a, SwsVector b)
void	sws_subVec (SwsVector a, SwsVector b)
void	sws_shiftVec (SwsVector *a, int shift)
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_freeVec (SwsVector *a)
SwsFilter *	sws_getDefaultFilter (float lumaGBlur, float chromaGBlur, float lumaSharpen, float chromaSharpen, float chromaHShift, float chromaVShift, int verbose)
void	sws_freeFilter (SwsFilter *filter)
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.
void	sws_convertPalette8ToPacked32 (const uint8_t src, uint8_t dst, int num_pixels, const uint8_t *palette)
	Converts an 8bit paletted frame into a frame with a color depth of 32-bits.
void	sws_convertPalette8ToPacked24 (const uint8_t src, uint8_t dst, int num_pixels, const uint8_t *palette)
	Converts an 8bit paletted frame into a frame with a color depth of 24 bits.
const AVClass *	sws_get_class (void)
	Get the AVClass for swsContext.