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1 fe8054c0 Michael Niedermayer
/*
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 * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
20 3db822b0 Arpi
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#ifndef SWSCALE_SWSCALE_H
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#define SWSCALE_SWSCALE_H
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/**
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 * @file libswscale/swscale.h
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 * @brief
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 *     external api for the swscale stuff
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 */
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#include "libavutil/avutil.h"
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#define LIBSWSCALE_VERSION_MAJOR 0
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#define LIBSWSCALE_VERSION_MINOR 7
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#define LIBSWSCALE_VERSION_MICRO 1
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#define LIBSWSCALE_VERSION_INT  AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
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                                               LIBSWSCALE_VERSION_MINOR, \
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                                               LIBSWSCALE_VERSION_MICRO)
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#define LIBSWSCALE_VERSION      AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
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                                           LIBSWSCALE_VERSION_MINOR, \
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                                           LIBSWSCALE_VERSION_MICRO)
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#define LIBSWSCALE_BUILD        LIBSWSCALE_VERSION_INT
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#define LIBSWSCALE_IDENT        "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)
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/**
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 * Returns the LIBSWSCALE_VERSION_INT constant.
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 */
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unsigned swscale_version(void);
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/* values for the flags, the stuff on the command line is different */
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#define SWS_FAST_BILINEAR     1
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#define SWS_BILINEAR          2
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#define SWS_BICUBIC           4
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#define SWS_X                 8
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#define SWS_POINT          0x10
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#define SWS_AREA           0x20
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#define SWS_BICUBLIN       0x40
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#define SWS_GAUSS          0x80
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#define SWS_SINC          0x100
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#define SWS_LANCZOS       0x200
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#define SWS_SPLINE        0x400
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#define SWS_SRC_V_CHR_DROP_MASK     0x30000
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#define SWS_SRC_V_CHR_DROP_SHIFT    16
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#define SWS_PARAM_DEFAULT           123456
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#define SWS_PRINT_INFO              0x1000
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//the following 3 flags are not completely implemented
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//internal chrominace subsampling info
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#define SWS_FULL_CHR_H_INT    0x2000
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//input subsampling info
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#define SWS_FULL_CHR_H_INP    0x4000
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#define SWS_DIRECT_BGR        0x8000
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#define SWS_ACCURATE_RND      0x40000
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#define SWS_BITEXACT          0x80000
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#define SWS_CPU_CAPS_MMX      0x80000000
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#define SWS_CPU_CAPS_MMX2     0x20000000
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#define SWS_CPU_CAPS_3DNOW    0x40000000
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#define SWS_CPU_CAPS_ALTIVEC  0x10000000
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#define SWS_CPU_CAPS_BFIN     0x01000000
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#define SWS_MAX_REDUCE_CUTOFF 0.002
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#define SWS_CS_ITU709         1
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#define SWS_CS_FCC            4
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#define SWS_CS_ITU601         5
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#define SWS_CS_ITU624         5
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#define SWS_CS_SMPTE170M      5
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#define SWS_CS_SMPTE240M      7
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#define SWS_CS_DEFAULT        5
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// when used for filters they must have an odd number of elements
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// coeffs cannot be shared between vectors
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typedef struct {
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    double *coeff;              ///< pointer to the list of coefficients
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    int length;                 ///< number of coefficients in the vector
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} SwsVector;
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// vectors can be shared
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typedef struct {
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    SwsVector *lumH;
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    SwsVector *lumV;
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    SwsVector *chrH;
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    SwsVector *chrV;
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} SwsFilter;
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struct SwsContext;
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void sws_freeContext(struct SwsContext *swsContext);
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/**
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 * Allocates and returns a SwsContext. You need it to perform
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 * scaling/conversion operations using sws_scale().
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 *
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 * @param srcW the width of the source image
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 * @param srcH the height of the source image
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 * @param srcFormat the source image format
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 * @param dstW the width of the destination image
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 * @param dstH the height of the destination image
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 * @param dstFormat the destination image format
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 * @param flags specify which algorithm and options to use for rescaling
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 * @return a pointer to an allocated context, or NULL in case of error
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 */
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struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int dstW, int dstH, enum PixelFormat dstFormat, int flags,
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                                  SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
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/**
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 * Scales the image slice in \p srcSlice and puts the resulting scaled
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 * slice in the image in \p dst. A slice is a sequence of consecutive
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 * rows in an image.
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 *
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 * @param context   the scaling context previously created with
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 *                  sws_getContext()
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 * @param srcSlice  the array containing the pointers to the planes of
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 *                  the source slice
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 * @param srcStride the array containing the strides for each plane of
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 *                  the source image
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 * @param srcSliceY the position in the source image of the slice to
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 *                  process, that is the number (counted starting from
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 *                  zero) in the image of the first row of the slice
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 * @param srcSliceH the height of the source slice, that is the number
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 *                  of rows in the slice
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 * @param dst       the array containing the pointers to the planes of
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 *                  the destination image
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 * @param dstStride the array containing the strides for each plane of
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 *                  the destination image
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 * @return          the height of the output slice
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 */
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int sws_scale(struct SwsContext *context, uint8_t* srcSlice[], int srcStride[], int srcSliceY,
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              int srcSliceH, uint8_t* dst[], int dstStride[]);
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#if LIBSWSCALE_VERSION_MAJOR < 1
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/**
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 * @deprecated Use sws_scale() instead.
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 */
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int sws_scale_ordered(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
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                      int srcSliceH, uint8_t* dst[], int dstStride[]) attribute_deprecated;
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#endif
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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);
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int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation);
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/**
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 * Returns a normalized Gaussian curve used to filter stuff
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 * quality=3 is high quality, lower is lower quality.
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 */
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SwsVector *sws_getGaussianVec(double variance, double quality);
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/**
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 * Allocates and returns a vector with \p length coefficients, all
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 * with the same value \p c.
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 */
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SwsVector *sws_getConstVec(double c, int length);
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/**
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 * Allocates and returns a vector with just one coefficient, with
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 * value 1.0.
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 */
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SwsVector *sws_getIdentityVec(void);
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/**
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 * Scales all the coefficients of \p a by the \p scalar value.
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 */
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void sws_scaleVec(SwsVector *a, double scalar);
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/**
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 * Scales all the coefficients of \p a so that their sum equals \p
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 * height."
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 */
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void sws_normalizeVec(SwsVector *a, double height);
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void sws_convVec(SwsVector *a, SwsVector *b);
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void sws_addVec(SwsVector *a, SwsVector *b);
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void sws_subVec(SwsVector *a, SwsVector *b);
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void sws_shiftVec(SwsVector *a, int shift);
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/**
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 * Allocates and returns a clone of the vector \p a, that is a vector
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 * with the same coefficients as \p a.
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 */
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SwsVector *sws_cloneVec(SwsVector *a);
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#if LIBSWSCALE_VERSION_MAJOR < 1
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/**
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 * @deprecated Use sws_printVec2() instead.
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 */
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attribute_deprecated void sws_printVec(SwsVector *a);
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#endif
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/**
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 * Prints with av_log() a textual representation of the vector \p a
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 * if \p log_level <= av_log_level.
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 */
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void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
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void sws_freeVec(SwsVector *a);
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SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
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                                float lumaSharpen, float chromaSharpen,
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                                float chromaHShift, float chromaVShift,
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                                int verbose);
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void sws_freeFilter(SwsFilter *filter);
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/**
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 * Checks if \p context can be reused, otherwise reallocates a new
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 * one.
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 *
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 * If \p context is NULL, just calls sws_getContext() to get a new
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 * context. Otherwise, checks if the parameters are the ones already
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 * saved in \p context. If that is the case, returns the current
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 * context. Otherwise, frees \p context and gets a new context with
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 * the new parameters.
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 *
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 * Be warned that \p srcFilter and \p dstFilter are not checked, they
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 * are assumed to remain the same.
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 */
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struct SwsContext *sws_getCachedContext(struct SwsContext *context,
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                                        int srcW, int srcH, enum PixelFormat srcFormat,
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                                        int dstW, int dstH, enum PixelFormat dstFormat, int flags,
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                                        SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
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#endif /* SWSCALE_SWSCALE_H */