libswscale/swscale.h File Reference

external api for the swscale stuff More...

#include "libavutil/avutil.h"

Go to the source code of this file.

Data Structures

struct SwsVector

struct SwsFilter

Defines

#define LIBSWSCALE_VERSION_MAJOR   0

#define LIBSWSCALE_VERSION_MINOR   11

#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 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

#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_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.

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 *context, 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_scale_ordered (struct SwsContext *context, const uint8_t *const src[], int srcStride[], int srcSliceY, int srcSliceH, uint8_t *dst[], int dstStride[]) attribute_deprecated

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.

attribute_deprecated void sws_printVec (SwsVector *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, long 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, long num_pixels, const uint8_t *palette)

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

Detailed Description

external api for the swscale stuff

Definition in file swscale.h.

Define Documentation

#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT

Definition at line 42 of file swscale.h.

#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)

Definition at line 44 of file swscale.h.

#define LIBSWSCALE_VERSION

Value:

AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
                                           LIBSWSCALE_VERSION_MINOR, \
                                           LIBSWSCALE_VERSION_MICRO)

Definition at line 39 of file swscale.h.

#define LIBSWSCALE_VERSION_INT

Value:

AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
                                               LIBSWSCALE_VERSION_MINOR, \
                                               LIBSWSCALE_VERSION_MICRO)

Definition at line 36 of file swscale.h.

Referenced by swscale_version().

#define LIBSWSCALE_VERSION_MAJOR 0

Definition at line 32 of file swscale.h.

#define LIBSWSCALE_VERSION_MICRO 0

Definition at line 34 of file swscale.h.

#define LIBSWSCALE_VERSION_MINOR 11

Definition at line 33 of file swscale.h.

#define SWS_ACCURATE_RND 0x40000

Definition at line 87 of file swscale.h.

Referenced by ff_get_unscaled_swscale(), initFilter(), sws_getContext(), yuv2packedX_TMPL(), yuv2yuv1_TMPL(), and yuv2yuvX_TMPL().

#define SWS_AREA 0x20

Definition at line 67 of file swscale.h.

Referenced by initFilter(), selfTest(), and sws_getContext().

#define SWS_BICUBIC 4

Definition at line 64 of file swscale.h.

Referenced by initFilter(), selfTest(), and sws_getContext().

#define SWS_BICUBLIN 0x40

Definition at line 68 of file swscale.h.

Referenced by sws_getContext().

#define SWS_BILINEAR 2

Definition at line 63 of file swscale.h.

Referenced by config_props(), initFilter(), main(), selfTest(), and sws_getContext().

#define SWS_BITEXACT 0x80000

Definition at line 88 of file swscale.h.

Referenced by ff_get_unscaled_swscale(), initFilter(), yuv2packedX_TMPL(), and yuv2yuvX_TMPL().

#define SWS_CPU_CAPS_3DNOW 0x40000000

Definition at line 92 of file swscale.h.

Referenced by args_parse(), ff_getSwsFunc(), sws_getContext(), and sws_rgb2rgb_init().

#define SWS_CPU_CAPS_ALTIVEC 0x10000000

Definition at line 93 of file swscale.h.

Referenced by ff_getSwsFunc(), ff_yuv2rgb_get_func_ptr(), ff_yuv2rgb_init_altivec(), initFilter(), sws_getContext(), and sws_setColorspaceDetails().

#define SWS_CPU_CAPS_BFIN 0x01000000

Definition at line 94 of file swscale.h.

Referenced by ff_bfin_get_unscaled_swscale(), ff_get_unscaled_swscale(), ff_hardcodedcpuflags(), ff_yuv2rgb_get_func_ptr(), and sws_getContext().

#define SWS_CPU_CAPS_MMX 0x80000000

Definition at line 90 of file swscale.h.

Referenced by args_parse(), DECLARE_ASM_CONST(), ff_getSwsFunc(), initFilter(), sws_getContext(), and sws_rgb2rgb_init().

#define SWS_CPU_CAPS_MMX2 0x20000000

Definition at line 91 of file swscale.h.

Referenced by args_parse(), DECLARE_ASM_CONST(), ff_getSwsFunc(), sws_getContext(), and sws_rgb2rgb_init().

#define SWS_CS_DEFAULT 5

Definition at line 104 of file swscale.h.

Referenced by sws_getCoefficients(), and sws_getContext().

#define SWS_CS_FCC 4

Definition at line 99 of file swscale.h.

#define SWS_CS_ITU601 5

Definition at line 100 of file swscale.h.

#define SWS_CS_ITU624 5

Definition at line 101 of file swscale.h.

#define SWS_CS_ITU709 1

Definition at line 98 of file swscale.h.

#define SWS_CS_SMPTE170M 5

Definition at line 102 of file swscale.h.

#define SWS_CS_SMPTE240M 7

Definition at line 103 of file swscale.h.

#define SWS_DIRECT_BGR 0x8000

Definition at line 86 of file swscale.h.

#define SWS_FAST_BILINEAR 1

Definition at line 62 of file swscale.h.

Referenced by ff_get_unscaled_swscale(), initFilter(), selfTest(), and sws_getContext().

#define SWS_FULL_CHR_H_INP 0x4000

Definition at line 85 of file swscale.h.

Referenced by sws_getContext().

#define SWS_FULL_CHR_H_INT 0x2000

Definition at line 83 of file swscale.h.

Referenced by sws_getContext().

#define SWS_GAUSS 0x80

Definition at line 69 of file swscale.h.

Referenced by initFilter(), and sws_getContext().

#define SWS_LANCZOS 0x200

Definition at line 71 of file swscale.h.

Referenced by initFilter(), and sws_getContext().

#define SWS_MAX_REDUCE_CUTOFF 0.002

Definition at line 96 of file swscale.h.

Referenced by initFilter().

#define SWS_PARAM_DEFAULT 123456

Definition at line 77 of file swscale.h.

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

#define SWS_POINT 0x10

Definition at line 66 of file swscale.h.

Referenced by ff_get_unscaled_swscale(), initFilter(), selfTest(), and sws_getContext().

#define SWS_PRINT_INFO 0x1000

Definition at line 79 of file swscale.h.

Referenced by initFilter(), and sws_getContext().

#define SWS_SINC 0x100

Definition at line 70 of file swscale.h.

Referenced by initFilter(), and sws_getContext().

#define SWS_SPLINE 0x400

Definition at line 72 of file swscale.h.

Referenced by initFilter(), and sws_getContext().

#define SWS_SRC_V_CHR_DROP_MASK 0x30000

Definition at line 74 of file swscale.h.

Referenced by sws_getContext().

#define SWS_SRC_V_CHR_DROP_SHIFT 16

Definition at line 75 of file swscale.h.

Referenced by sws_getContext().

#define SWS_X 8

Definition at line 65 of file swscale.h.

Referenced by initFilter(), selfTest(), and sws_getContext().

Function Documentation

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_convertPalette8ToPacked24	(	const uint8_t *	src,
		uint8_t *	dst,
		long	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 1976 of file swscale.c.

Referenced by palette8topacked24(), and palToRgbWrapper().

void sws_convertPalette8ToPacked32	(	const uint8_t *	src,
		uint8_t *	dst,
		long	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 1967 of file swscale.c.

Referenced by palette8topacked32(), and palToRgbWrapper().

void sws_convVec	(	SwsVector *	a,
		SwsVector *	b
	)

Definition at line 1433 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 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().

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 54 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 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().

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

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().

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().

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().

attribute_deprecated 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().

int sws_scale	(	SwsContext *	c,
		const uint8_t *const	src[],
		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:

	context	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 1837 of file swscale.c.

Referenced by do_video_out(), doTest(), draw_slice(), main(), queue_picture(), sws_scale_ordered(), and write_video_frame().

int sws_scale_ordered	(	struct SwsContext *	context,
		const uint8_t *const	src[],
		int	srcStride[],
		int	srcSliceY,
		int	srcSliceH,
		uint8_t *	dst[],
		int	dstStride[]
	)

Deprecated:: Use sws_scale() instead.

Definition at line 1959 of file swscale.c.

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.

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.


Data Structures
struct	SwsVector
struct	SwsFilter
Defines
#define	LIBSWSCALE_VERSION_MAJOR 0
#define	LIBSWSCALE_VERSION_MINOR 11
#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	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
#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_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.
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 context, 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_scale_ordered (struct SwsContext context, const uint8_t const src[], int srcStride[], int srcSliceY, int srcSliceH, uint8_t *dst[], int dstStride[]) attribute_deprecated
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.
attribute_deprecated void	sws_printVec (SwsVector *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, long 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, long num_pixels, const uint8_t *palette)
	Converts an 8bit paletted frame into a frame with a color depth of 24 bits.