libswscale/swscale.h - third_party/ffmpeg - Git at Google

 /*
  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */

 #ifndef SWSCALE_SWSCALE_H
 #define SWSCALE_SWSCALE_H

 /**
  * @file
  * @brief
  *     external api for the swscale stuff
  */

 #include "libavutil/avutil.h"

 #define LIBSWSCALE_VERSION_MAJOR 0
 #define LIBSWSCALE_VERSION_MINOR 14
 #define LIBSWSCALE_VERSION_MICRO 1

 #define LIBSWSCALE_VERSION_INT  AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
                                                LIBSWSCALE_VERSION_MINOR, \
                                                LIBSWSCALE_VERSION_MICRO)
 #define LIBSWSCALE_VERSION      AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
                                            LIBSWSCALE_VERSION_MINOR, \
                                            LIBSWSCALE_VERSION_MICRO)
 #define LIBSWSCALE_BUILD        LIBSWSCALE_VERSION_INT

 #define LIBSWSCALE_IDENT        "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)

 /**
  * Those FF_API_* defines are not part of public API.
  * They may change, break or disappear at any time.
  */
 #ifndef FF_API_SWS_GETCONTEXT
 #define FF_API_SWS_GETCONTEXT  (LIBSWSCALE_VERSION_MAJOR < 3)
 #endif
 #ifndef FF_API_SWS_CPU_CAPS
 #define FF_API_SWS_CPU_CAPS    (LIBSWSCALE_VERSION_MAJOR < 3)
 #endif
 #ifndef FF_API_SWS_FORMAT_NAME
 #define FF_API_SWS_FORMAT_NAME  (LIBSWSCALE_VERSION_MAJOR < 3)
 #endif

 /**
  * Returns the LIBSWSCALE_VERSION_INT constant.
  */
 unsigned swscale_version(void);

 /**
  * Returns the libswscale build-time configuration.
  */
 const char *swscale_configuration(void);

 /**
  * Returns the libswscale license.
  */
 const char *swscale_license(void);

 /* values for the flags, the stuff on the command line is different */
 #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

 //the following 3 flags are not completely implemented
 //internal chrominace subsampling info
 #define SWS_FULL_CHR_H_INT    0x2000
 //input subsampling info
 #define SWS_FULL_CHR_H_INP    0x4000
 #define SWS_DIRECT_BGR        0x8000
 #define SWS_ACCURATE_RND      0x40000
 #define SWS_BITEXACT          0x80000

 #if FF_API_SWS_CPU_CAPS
 /**
  * CPU caps are autodetected now, those flags
  * are only provided for API compatibility.
  */
 #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_CPU_CAPS_SSE2     0x02000000
 #endif

 #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

 /**
  * Returns a pointer to yuv<->rgb coefficients for the given colorspace
  * suitable for sws_setColorspaceDetails().
  *
  * @param colorspace One of the SWS_CS_* macros. If invalid,
  * SWS_CS_DEFAULT is used.
  */
 const int *sws_getCoefficients(int colorspace);


 // when used for filters they must have an odd number of elements
 // coeffs cannot be shared between vectors
 typedef struct {
     double *coeff;              ///< pointer to the list of coefficients
     int length;                 ///< number of coefficients in the vector
 } SwsVector;

 // vectors can be shared
 typedef struct {
     SwsVector *lumH;
     SwsVector *lumV;
     SwsVector *chrH;
     SwsVector *chrV;
 } SwsFilter;

 struct SwsContext;

 /**
  * Returns a positive value if pix_fmt is a supported input format, 0
  * otherwise.
  */
 int sws_isSupportedInput(enum PixelFormat pix_fmt);

 /**
  * Returns a positive value if pix_fmt is a supported output format, 0
  * otherwise.
  */
 int sws_isSupportedOutput(enum PixelFormat pix_fmt);

 /**
  * Allocates an empty SwsContext. This must be filled and passed to
  * sws_init_context(). For filling see AVOptions, options.c and
  * sws_setColorspaceDetails().
  */
 struct SwsContext *sws_alloc_context(void);

 /**
  * Initializes the swscaler context sws_context.
  *
  * @return zero or positive value on success, a negative value on
  * error
  */
 int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);

 /**
  * Frees the swscaler context swsContext.
  * If swsContext is NULL, then does nothing.
  */
 void sws_freeContext(struct SwsContext *swsContext);

 #if FF_API_SWS_GETCONTEXT
 /**
  * Allocates and returns a SwsContext. You need it to perform
  * scaling/conversion operations using sws_scale().
  *
  * @param srcW the width of the source image
  * @param srcH the height of the source image
  * @param srcFormat the source image format
  * @param dstW the width of the destination image
  * @param dstH the height of the destination image
  * @param dstFormat the destination image format
  * @param flags specify which algorithm and options to use for rescaling
  * @return 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.
  */
 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);
 #endif

 /**
  * 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.
  *
  * @param context   the scaling context previously created with
  *                  sws_getContext()
  * @param srcSlice  the array containing the pointers to the planes of
  *                  the source slice
  * @param srcStride the array containing the strides for each plane of
  *                  the source image
  * @param 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
  * @param srcSliceH the height of the source slice, that is the number
  *                  of rows in the slice
  * @param dst       the array containing the pointers to the planes of
  *                  the destination image
  * @param dstStride the array containing the strides for each plane of
  *                  the destination image
  * @return          the height of the output slice
  */
 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[]);

 #if LIBSWSCALE_VERSION_MAJOR < 1
 /**
  * @deprecated Use sws_scale() instead.
  */
 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;
 #endif

 /**
  * @param inv_table the yuv2rgb coefficients, normally ff_yuv2rgb_coeffs[x]
  * @return -1 if not supported
  */
 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);

 /**
  * @return -1 if not supported
  */
 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
                              int *srcRange, int **table, int *dstRange,
                              int *brightness, int *contrast, int *saturation);

 /**
  * Allocates and returns an uninitialized vector with length coefficients.
  */
 SwsVector *sws_allocVec(int length);

 /**
  * Returns a normalized Gaussian curve used to filter stuff
  * quality=3 is high quality, lower is lower quality.
  */
 SwsVector *sws_getGaussianVec(double variance, double quality);

 /**
  * Allocates and returns a vector with length coefficients, all
  * with the same value c.
  */
 SwsVector *sws_getConstVec(double c, int length);

 /**
  * Allocates and returns a vector with just one coefficient, with
  * value 1.0.
  */
 SwsVector *sws_getIdentityVec(void);

 /**
  * Scales all the coefficients of a by the scalar value.
  */
 void sws_scaleVec(SwsVector *a, double scalar);

 /**
  * Scales all the coefficients of a so that their sum equals height.
  */
 void sws_normalizeVec(SwsVector *a, double 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);

 /**
  * Allocates and returns a clone of the vector a, that is a vector
  * with the same coefficients as a.
  */
 SwsVector *sws_cloneVec(SwsVector *a);

 #if LIBSWSCALE_VERSION_MAJOR < 1
 /**
  * @deprecated Use sws_printVec2() instead.
  */
 attribute_deprecated void sws_printVec(SwsVector *a);
 #endif

 /**
  * Prints with av_log() a textual representation of the vector a
  * if log_level <= av_log_level.
  */
 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int 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);

 /**
  * 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.
  */
 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);

 /**
  * 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.
  *
  * @param src        source frame buffer
  * @param dst        destination frame buffer
  * @param num_pixels number of pixels to convert
  * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
  */
 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 24 bits.
  *
  * With the palette format "ABCD", the destination frame ends up with the format "ABC".
  *
  * @param src        source frame buffer
  * @param dst        destination frame buffer
  * @param num_pixels number of pixels to convert
  * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
  */
 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette);


 #endif /* SWSCALE_SWSCALE_H */
	/*
	* Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* FFmpeg is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#ifndef SWSCALE_SWSCALE_H
	#define SWSCALE_SWSCALE_H

	/**
	* @file
	* @brief
	* external api for the swscale stuff
	*/

	#include "libavutil/avutil.h"

	#define LIBSWSCALE_VERSION_MAJOR 0
	#define LIBSWSCALE_VERSION_MINOR 14
	#define LIBSWSCALE_VERSION_MICRO 1

	#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
	LIBSWSCALE_VERSION_MINOR, \
	LIBSWSCALE_VERSION_MICRO)
	#define LIBSWSCALE_VERSION AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
	LIBSWSCALE_VERSION_MINOR, \
	LIBSWSCALE_VERSION_MICRO)
	#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT

	#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)

	/**
	* Those FF_API_* defines are not part of public API.
	* They may change, break or disappear at any time.
	*/
	#ifndef FF_API_SWS_GETCONTEXT
	#define FF_API_SWS_GETCONTEXT (LIBSWSCALE_VERSION_MAJOR < 3)
	#endif
	#ifndef FF_API_SWS_CPU_CAPS
	#define FF_API_SWS_CPU_CAPS (LIBSWSCALE_VERSION_MAJOR < 3)
	#endif
	#ifndef FF_API_SWS_FORMAT_NAME
	#define FF_API_SWS_FORMAT_NAME (LIBSWSCALE_VERSION_MAJOR < 3)
	#endif

	/**
	* Returns the LIBSWSCALE_VERSION_INT constant.
	*/
	unsigned swscale_version(void);

	/**
	* Returns the libswscale build-time configuration.
	*/
	const char *swscale_configuration(void);

	/**
	* Returns the libswscale license.
	*/
	const char *swscale_license(void);

	/* values for the flags, the stuff on the command line is different */
	#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

	//the following 3 flags are not completely implemented
	//internal chrominace subsampling info
	#define SWS_FULL_CHR_H_INT 0x2000
	//input subsampling info
	#define SWS_FULL_CHR_H_INP 0x4000
	#define SWS_DIRECT_BGR 0x8000
	#define SWS_ACCURATE_RND 0x40000
	#define SWS_BITEXACT 0x80000

	#if FF_API_SWS_CPU_CAPS
	/**
	* CPU caps are autodetected now, those flags
	* are only provided for API compatibility.
	*/
	#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_CPU_CAPS_SSE2 0x02000000
	#endif

	#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

	/**
	* Returns a pointer to yuv<->rgb coefficients for the given colorspace
	* suitable for sws_setColorspaceDetails().
	*
	* @param colorspace One of the SWS_CS_* macros. If invalid,
	* SWS_CS_DEFAULT is used.
	*/
	const int *sws_getCoefficients(int colorspace);


	// when used for filters they must have an odd number of elements
	// coeffs cannot be shared between vectors
	typedef struct {
	double *coeff; ///< pointer to the list of coefficients
	int length; ///< number of coefficients in the vector
	} SwsVector;

	// vectors can be shared
	typedef struct {
	SwsVector *lumH;
	SwsVector *lumV;
	SwsVector *chrH;
	SwsVector *chrV;
	} SwsFilter;

	struct SwsContext;

	/**
	* Returns a positive value if pix_fmt is a supported input format, 0
	* otherwise.
	*/
	int sws_isSupportedInput(enum PixelFormat pix_fmt);

	/**
	* Returns a positive value if pix_fmt is a supported output format, 0
	* otherwise.
	*/
	int sws_isSupportedOutput(enum PixelFormat pix_fmt);

	/**
	* Allocates an empty SwsContext. This must be filled and passed to
	* sws_init_context(). For filling see AVOptions, options.c and
	* sws_setColorspaceDetails().
	*/
	struct SwsContext *sws_alloc_context(void);

	/**
	* Initializes the swscaler context sws_context.
	*
	* @return zero or positive value on success, a negative value on
	* error
	*/
	int sws_init_context(struct SwsContext sws_context, SwsFilter srcFilter, SwsFilter *dstFilter);

	/**
	* Frees the swscaler context swsContext.
	* If swsContext is NULL, then does nothing.
	*/
	void sws_freeContext(struct SwsContext *swsContext);

	#if FF_API_SWS_GETCONTEXT
	/**
	* Allocates and returns a SwsContext. You need it to perform
	* scaling/conversion operations using sws_scale().
	*
	* @param srcW the width of the source image
	* @param srcH the height of the source image
	* @param srcFormat the source image format
	* @param dstW the width of the destination image
	* @param dstH the height of the destination image
	* @param dstFormat the destination image format
	* @param flags specify which algorithm and options to use for rescaling
	* @return 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.
	*/
	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);
	#endif

	/**
	* 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.
	*
	* @param context the scaling context previously created with
	* sws_getContext()
	* @param srcSlice the array containing the pointers to the planes of
	* the source slice
	* @param srcStride the array containing the strides for each plane of
	* the source image
	* @param 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
	* @param srcSliceH the height of the source slice, that is the number
	* of rows in the slice
	* @param dst the array containing the pointers to the planes of
	* the destination image
	* @param dstStride the array containing the strides for each plane of
	* the destination image
	* @return the height of the output slice
	*/
	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[]);

	#if LIBSWSCALE_VERSION_MAJOR < 1
	/**
	* @deprecated Use sws_scale() instead.
	*/
	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;
	#endif

	/**
	* @param inv_table the yuv2rgb coefficients, normally ff_yuv2rgb_coeffs[x]
	* @return -1 if not supported
	*/
	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);

	/**
	* @return -1 if not supported
	*/
	int sws_getColorspaceDetails(struct SwsContext c, int *inv_table,
	int srcRange, int table, int dstRange,
	int brightness, int contrast, int *saturation);

	/**
	* Allocates and returns an uninitialized vector with length coefficients.
	*/
	SwsVector *sws_allocVec(int length);

	/**
	* Returns a normalized Gaussian curve used to filter stuff
	* quality=3 is high quality, lower is lower quality.
	*/
	SwsVector *sws_getGaussianVec(double variance, double quality);

	/**
	* Allocates and returns a vector with length coefficients, all
	* with the same value c.
	*/
	SwsVector *sws_getConstVec(double c, int length);

	/**
	* Allocates and returns a vector with just one coefficient, with
	* value 1.0.
	*/
	SwsVector *sws_getIdentityVec(void);

	/**
	* Scales all the coefficients of a by the scalar value.
	*/
	void sws_scaleVec(SwsVector *a, double scalar);

	/**
	* Scales all the coefficients of a so that their sum equals height.
	*/
	void sws_normalizeVec(SwsVector *a, double 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);

	/**
	* Allocates and returns a clone of the vector a, that is a vector
	* with the same coefficients as a.
	*/
	SwsVector sws_cloneVec(SwsVector a);

	#if LIBSWSCALE_VERSION_MAJOR < 1
	/**
	* @deprecated Use sws_printVec2() instead.
	*/
	attribute_deprecated void sws_printVec(SwsVector *a);
	#endif

	/**
	* Prints with av_log() a textual representation of the vector a
	* if log_level <= av_log_level.
	*/
	void sws_printVec2(SwsVector a, AVClass log_ctx, int 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);

	/**
	* 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.
	*/
	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);

	/**
	* 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.
	*
	* @param src source frame buffer
	* @param dst destination frame buffer
	* @param num_pixels number of pixels to convert
	* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
	*/
	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 24 bits.
	*
	* With the palette format "ABCD", the destination frame ends up with the format "ABC".
	*
	* @param src source frame buffer
	* @param dst destination frame buffer
	* @param num_pixels number of pixels to convert
	* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
	*/
	void sws_convertPalette8ToPacked24(const uint8_t src, uint8_t dst, long num_pixels, const uint8_t *palette);


	#endif /* SWSCALE_SWSCALE_H */