Do not use abgrToA for both luma and alpha channel in hyscale.
[libav.git] / libswscale / swscale.h
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fe8054c0 1/*
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2 * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
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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.
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10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
d026b45e 15 *
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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
b19bcbaa 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
d026b45e 19 */
3db822b0 20
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21#ifndef SWSCALE_SWSCALE_H
22#define SWSCALE_SWSCALE_H
5427e242 23
d4e24275 24/**
82aaa790 25 * @file libswscale/swscale.h
6a4970ab 26 * @brief
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27 * external api for the swscale stuff
28 */
29
88517699 30#include "libavutil/avutil.h"
d28ef270 31
e08e6bb6 32#define LIBSWSCALE_VERSION_MAJOR 0
26b40a65 33#define LIBSWSCALE_VERSION_MINOR 7
e76709d8 34#define LIBSWSCALE_VERSION_MICRO 1
ccf95ef1 35
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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)
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42#define LIBSWSCALE_BUILD LIBSWSCALE_VERSION_INT
43
44#define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)
45
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46/**
47 * Returns the LIBSWSCALE_VERSION_INT constant.
48 */
49unsigned swscale_version(void);
50
28bf81c9 51/* values for the flags, the stuff on the command line is different */
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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
1e621b18 63
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64#define SWS_SRC_V_CHR_DROP_MASK 0x30000
65#define SWS_SRC_V_CHR_DROP_SHIFT 16
5859233b 66
221b804f 67#define SWS_PARAM_DEFAULT 123456
a86c461c 68
221b804f 69#define SWS_PRINT_INFO 0x1000
a86c461c 70
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71//the following 3 flags are not completely implemented
72//internal chrominace subsampling info
221b804f 73#define SWS_FULL_CHR_H_INT 0x2000
1e621b18 74//input subsampling info
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75#define SWS_FULL_CHR_H_INP 0x4000
76#define SWS_DIRECT_BGR 0x8000
77#define SWS_ACCURATE_RND 0x40000
ceb700ba 78#define SWS_BITEXACT 0x80000
1e621b18 79
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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
d3f3eea9 84#define SWS_CPU_CAPS_BFIN 0x01000000
516b1f82 85
c7f822d9 86#define SWS_MAX_REDUCE_CUTOFF 0.002
28bf81c9 87
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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
0481412a 95
77a49659 96
28bf81c9 97
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98// when used for filters they must have an odd number of elements
99// coeffs cannot be shared between vectors
28bf81c9 100typedef struct {
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101 double *coeff; ///< pointer to the list of coefficients
102 int length; ///< number of coefficients in the vector
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103} SwsVector;
104
105// vectors can be shared
106typedef struct {
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107 SwsVector *lumH;
108 SwsVector *lumV;
109 SwsVector *chrH;
110 SwsVector *chrV;
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111} SwsFilter;
112
d4e24275 113struct SwsContext;
077ea8a7 114
d4e24275 115void sws_freeContext(struct SwsContext *swsContext);
28bf81c9 116
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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 */
96b27045 130struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat, int dstW, int dstH, enum PixelFormat dstFormat, int flags,
221b804f 131 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
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132
133/**
15239b7f 134 * Scales the image slice in \p srcSlice and puts the resulting scaled
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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()
15239b7f 140 * @param srcSlice the array containing the pointers to the planes of
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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 */
15239b7f 155int sws_scale(struct SwsContext *context, uint8_t* srcSlice[], int srcStride[], int srcSliceY,
221b804f 156 int srcSliceH, uint8_t* dst[], int dstStride[]);
c099766f 157#if LIBSWSCALE_VERSION_MAJOR < 1
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158/**
159 * @deprecated Use sws_scale() instead.
160 */
fccb9b2b 161int sws_scale_ordered(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
221b804f 162 int srcSliceH, uint8_t* dst[], int dstStride[]) attribute_deprecated;
c099766f 163#endif
d4e24275 164
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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);
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168
169/**
170 * Returns a normalized Gaussian curve used to filter stuff
171 * quality=3 is high quality, lower is lower quality.
172 */
d4e24275 173SwsVector *sws_getGaussianVec(double variance, double quality);
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174
175/**
70838eef 176 * Allocates and returns a vector with \p length coefficients, all
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177 * with the same value \p c.
178 */
d4e24275 179SwsVector *sws_getConstVec(double c, int length);
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180
181/**
182 * Allocates and returns a vector with just one coefficient, with
183 * value 1.0.
184 */
d4e24275 185SwsVector *sws_getIdentityVec(void);
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186
187/**
188 * Scales all the coefficients of \p a by the \p scalar value.
189 */
d4e24275 190void sws_scaleVec(SwsVector *a, double scalar);
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191
192/**
193 * Scales all the coefficients of \p a so that their sum equals \p
194 * height."
195 */
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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);
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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 */
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206SwsVector *sws_cloneVec(SwsVector *a);
207
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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
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221void sws_freeVec(SwsVector *a);
222
6a4970ab 223SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
b534f73d 224 float lumaSharpen, float chromaSharpen,
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225 float chromaHShift, float chromaVShift,
226 int verbose);
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227void sws_freeFilter(SwsFilter *filter);
228
b954b34a 229/**
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230 * Checks if \p context can be reused, otherwise reallocates a new
231 * one.
b954b34a 232 *
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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.
b954b34a 241 */
22e46959 242struct SwsContext *sws_getCachedContext(struct SwsContext *context,
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243 int srcW, int srcH, enum PixelFormat srcFormat,
244 int dstW, int dstH, enum PixelFormat dstFormat, int flags,
221b804f 245 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
22e46959 246
0eaf5235 247#endif /* SWSCALE_SWSCALE_H */