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			/*
			* Copyright (C) 2001-2011 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
			* @ingroup libsws
			* external API header
			*/

			#include <stdint.h>

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

			/**
			* @defgroup libsws libswscale
			* Color conversion and scaling library.
			*
			* @{
			*
			* Return the LIBSWSCALE_VERSION_INT constant.
			*/
			unsigned swscale_version(void);

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

			/**
			* Return 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 chrominance 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
			#define SWS_ERROR_DIFFUSION 0x800000

			#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
			#define SWS_CS_BT2020 9

			/**
			* Return 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 SwsVector {
			double *coeff; ///< pointer to the list of coefficients
			int length; ///< number of coefficients in the vector
			} SwsVector;

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

			struct SwsContext;

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

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

			/**
			* @param[in] pix_fmt the pixel format
			* @return a positive value if an endianness conversion for pix_fmt is
			* supported, 0 otherwise.
			*/
			int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);

			/**
			* Allocate 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);

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

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

			/**
			* Allocate and return an 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
			* @param param extra parameters to tune the used scaler
			* For SWS_BICUBIC param[0] and [1] tune the shape of the basis
			* function, param[0] tunes f(1) and param[1] f´(1)
			* For SWS_GAUSS param[0] tunes the exponent and thus cutoff
			* frequency
			* For SWS_LANCZOS param[0] tunes the width of the window function
			* @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
			*/
			struct SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
			int dstW, int dstH, enum AVPixelFormat dstFormat,
			int flags, SwsFilter *srcFilter,
			SwsFilter dstFilter, const double param);

			/**
			* Scale the image slice in srcSlice and put 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 c 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 c, const uint8_t const srcSlice[],
			const int srcStride[], int srcSliceY, int srcSliceH,
			uint8_t *const dst[], const int dstStride[]);

			/**
			* @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
			* @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
			* @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
			* @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
			* @param brightness 16.16 fixed point brightness correction
			* @param contrast 16.16 fixed point contrast correction
			* @param saturation 16.16 fixed point saturation correction
			* @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);

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

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

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

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

			#if FF_API_SWS_VECTOR
			attribute_deprecated SwsVector *sws_getConstVec(double c, int length);
			attribute_deprecated SwsVector *sws_getIdentityVec(void);
			attribute_deprecated void sws_convVec(SwsVector a, SwsVector b);
			attribute_deprecated void sws_addVec(SwsVector a, SwsVector b);
			attribute_deprecated void sws_subVec(SwsVector a, SwsVector b);
			attribute_deprecated void sws_shiftVec(SwsVector *a, int shift);
			attribute_deprecated SwsVector sws_cloneVec(SwsVector a);
			attribute_deprecated void sws_printVec2(SwsVector a, AVClass log_ctx, int log_level);
			#endif

			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);

			/**
			* Check if context can be reused, otherwise reallocate 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 AVPixelFormat srcFormat,
			int dstW, int dstH, enum AVPixelFormat dstFormat,
			int flags, SwsFilter *srcFilter,
			SwsFilter dstFilter, const double param);

			/**
			* Convert an 8-bit 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, int num_pixels, const uint8_t *palette);

			/**
			* Convert an 8-bit 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, int num_pixels, const uint8_t *palette);

			/**
			* Get the AVClass for swsContext. It can be used in combination with
			* AV_OPT_SEARCH_FAKE_OBJ for examining options.
			*
			* @see av_opt_find().
			*/
			const AVClass *sws_get_class(void);

			/**
			* @}
			*/

			#endif /* SWSCALE_SWSCALE_H */