+++ /dev/null
-/*
- * 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 Color conversion and scaling
- * @{
- *
- * 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 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
-#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
-
-/**
- * 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);
-
-/**
- * Allocate and return a vector with length coefficients, all
- * with the same value c.
- */
-SwsVector *sws_getConstVec(double c, int length);
-
-/**
- * Allocate and return a vector with just one coefficient, with
- * value 1.0.
- */
-SwsVector *sws_getIdentityVec(void);
-
-/**
- * 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);
-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);
-
-/**
- * Allocate and return a clone of the vector a, that is a vector
- * with the same coefficients as a.
- */
-SwsVector *sws_cloneVec(SwsVector *a);
-
-/**
- * Print 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);
-
-/**
- * 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 */
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