1/* 2 * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#ifndef SWSCALE_SWSCALE_H 22#define SWSCALE_SWSCALE_H 23 24/** 25 * @file libswscale/swscale.h 26 * @brief 27 * external api for the swscale stuff 28 */ 29 30#include "libavutil/avutil.h" 31 32#define LIBSWSCALE_VERSION_MAJOR 0 33#define LIBSWSCALE_VERSION_MINOR 7 34#define LIBSWSCALE_VERSION_MICRO 1 35 36#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \ 37 LIBSWSCALE_VERSION_MINOR, \ 38 LIBSWSCALE_VERSION_MICRO) 39#define LIBSWSCALE_VERSION AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \ 40 LIBSWSCALE_VERSION_MINOR, \ 41 LIBSWSCALE_VERSION_MICRO) 42#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT 43 44#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION) 45 46/** 47 * Returns the LIBSWSCALE_VERSION_INT constant. 48 */ 49unsigned swscale_version(void); 50 51/* values for the flags, the stuff on the command line is different */ 52#define SWS_FAST_BILINEAR 1 53#define SWS_BILINEAR 2 54#define SWS_BICUBIC 4 55#define SWS_X 8 56#define SWS_POINT 0x10 57#define SWS_AREA 0x20 58#define SWS_BICUBLIN 0x40 59#define SWS_GAUSS 0x80 60#define SWS_SINC 0x100 61#define SWS_LANCZOS 0x200 62#define SWS_SPLINE 0x400 63 64#define SWS_SRC_V_CHR_DROP_MASK 0x30000 65#define SWS_SRC_V_CHR_DROP_SHIFT 16 66 67#define SWS_PARAM_DEFAULT 123456 68 69#define SWS_PRINT_INFO 0x1000 70 71//the following 3 flags are not completely implemented 72//internal chrominace subsampling info 73#define SWS_FULL_CHR_H_INT 0x2000 74//input subsampling info 75#define SWS_FULL_CHR_H_INP 0x4000 76#define SWS_DIRECT_BGR 0x8000 77#define SWS_ACCURATE_RND 0x40000 78#define SWS_BITEXACT 0x80000 79 80#define SWS_CPU_CAPS_MMX 0x80000000 81#define SWS_CPU_CAPS_MMX2 0x20000000 82#define SWS_CPU_CAPS_3DNOW 0x40000000 83#define SWS_CPU_CAPS_ALTIVEC 0x10000000 84#define SWS_CPU_CAPS_BFIN 0x01000000 85 86#define SWS_MAX_REDUCE_CUTOFF 0.002 87 88#define SWS_CS_ITU709 1 89#define SWS_CS_FCC 4 90#define SWS_CS_ITU601 5 91#define SWS_CS_ITU624 5 92#define SWS_CS_SMPTE170M 5 93#define SWS_CS_SMPTE240M 7 94#define SWS_CS_DEFAULT 5 95 96 97 98// when used for filters they must have an odd number of elements 99// coeffs cannot be shared between vectors 100typedef struct { 101 double *coeff; ///< pointer to the list of coefficients 102 int length; ///< number of coefficients in the vector 103} SwsVector; 104 105// vectors can be shared 106typedef struct { 107 SwsVector *lumH; 108 SwsVector *lumV; 109 SwsVector *chrH; 110 SwsVector *chrV; 111} SwsFilter; 112 113struct SwsContext; 114 115void sws_freeContext(struct SwsContext *swsContext); 116 117/** 118 * Allocates and returns a SwsContext. You need it to perform 119 * scaling/conversion operations using sws_scale(). 120 * 121 * @param srcW the width of the source image 122 * @param srcH the height of the source image 123 * @param srcFormat the source image format 124 * @param dstW the width of the destination image 125 * @param dstH the height of the destination image 126 * @param dstFormat the destination image format 127 * @param flags specify which algorithm and options to use for rescaling 128 * @return a pointer to an allocated context, or NULL in case of error 129 */ 130struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int dstW, int dstH, enum PixelFormat dstFormat, int flags, 131 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param); 132 133/** 134 * Scales the image slice in \p srcSlice and puts the resulting scaled 135 * slice in the image in \p dst. A slice is a sequence of consecutive 136 * rows in an image. 137 * 138 * @param context the scaling context previously created with 139 * sws_getContext() 140 * @param srcSlice the array containing the pointers to the planes of 141 * the source slice 142 * @param srcStride the array containing the strides for each plane of 143 * the source image 144 * @param srcSliceY the position in the source image of the slice to 145 * process, that is the number (counted starting from 146 * zero) in the image of the first row of the slice 147 * @param srcSliceH the height of the source slice, that is the number 148 * of rows in the slice 149 * @param dst the array containing the pointers to the planes of 150 * the destination image 151 * @param dstStride the array containing the strides for each plane of 152 * the destination image 153 * @return the height of the output slice 154 */ 155int sws_scale(struct SwsContext *context, uint8_t* srcSlice[], int srcStride[], int srcSliceY, 156 int srcSliceH, uint8_t* dst[], int dstStride[]); 157#if LIBSWSCALE_VERSION_MAJOR < 1 158/** 159 * @deprecated Use sws_scale() instead. 160 */ 161int sws_scale_ordered(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY, 162 int srcSliceH, uint8_t* dst[], int dstStride[]) attribute_deprecated; 163#endif 164 165 166int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation); 167int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation); 168 169/** 170 * Returns a normalized Gaussian curve used to filter stuff 171 * quality=3 is high quality, lower is lower quality. 172 */ 173SwsVector *sws_getGaussianVec(double variance, double quality); 174 175/** 176 * Allocates and returns a vector with \p length coefficients, all 177 * with the same value \p c. 178 */ 179SwsVector *sws_getConstVec(double c, int length); 180 181/** 182 * Allocates and returns a vector with just one coefficient, with 183 * value 1.0. 184 */ 185SwsVector *sws_getIdentityVec(void); 186 187/** 188 * Scales all the coefficients of \p a by the \p scalar value. 189 */ 190void sws_scaleVec(SwsVector *a, double scalar); 191 192/** 193 * Scales all the coefficients of \p a so that their sum equals \p 194 * height." 195 */ 196void sws_normalizeVec(SwsVector *a, double height); 197void sws_convVec(SwsVector *a, SwsVector *b); 198void sws_addVec(SwsVector *a, SwsVector *b); 199void sws_subVec(SwsVector *a, SwsVector *b); 200void sws_shiftVec(SwsVector *a, int shift); 201 202/** 203 * Allocates and returns a clone of the vector \p a, that is a vector 204 * with the same coefficients as \p a. 205 */ 206SwsVector *sws_cloneVec(SwsVector *a); 207 208#if LIBSWSCALE_VERSION_MAJOR < 1 209/** 210 * @deprecated Use sws_printVec2() instead. 211 */ 212attribute_deprecated void sws_printVec(SwsVector *a); 213#endif 214 215/** 216 * Prints with av_log() a textual representation of the vector \p a 217 * if \p log_level <= av_log_level. 218 */ 219void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level); 220 221void sws_freeVec(SwsVector *a); 222 223SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur, 224 float lumaSharpen, float chromaSharpen, 225 float chromaHShift, float chromaVShift, 226 int verbose); 227void sws_freeFilter(SwsFilter *filter); 228 229/** 230 * Checks if \p context can be reused, otherwise reallocates a new 231 * one. 232 * 233 * If \p context is NULL, just calls sws_getContext() to get a new 234 * context. Otherwise, checks if the parameters are the ones already 235 * saved in \p context. If that is the case, returns the current 236 * context. Otherwise, frees \p context and gets a new context with 237 * the new parameters. 238 * 239 * Be warned that \p srcFilter and \p dstFilter are not checked, they 240 * are assumed to remain the same. 241 */ 242struct SwsContext *sws_getCachedContext(struct SwsContext *context, 243 int srcW, int srcH, enum PixelFormat srcFormat, 244 int dstW, int dstH, enum PixelFormat dstFormat, int flags, 245 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param); 246 247#endif /* SWSCALE_SWSCALE_H */ 248