2 * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef SWSCALE_SWSCALE_H
22 #define SWSCALE_SWSCALE_H
27 * external api for the swscale stuff
30 #include "libavutil/avutil.h"
32 #define LIBSWSCALE_VERSION_MAJOR 1
33 #define LIBSWSCALE_VERSION_MINOR 1
34 #define LIBSWSCALE_VERSION_MICRO 0
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
44 #define LIBSWSCALE_IDENT "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)
47 * Those FF_API_* defines are not part of public API.
48 * They may change, break or disappear at any time.
50 #ifndef FF_API_SWS_GETCONTEXT
51 #define FF_API_SWS_GETCONTEXT (LIBSWSCALE_VERSION_MAJOR < 2)
55 * Returns the LIBSWSCALE_VERSION_INT constant.
57 unsigned swscale_version(void);
60 * Returns the libswscale build-time configuration.
62 const char *swscale_configuration(void);
65 * Returns the libswscale license.
67 const char *swscale_license(void);
69 /* values for the flags, the stuff on the command line is different */
70 #define SWS_FAST_BILINEAR 1
71 #define SWS_BILINEAR 2
74 #define SWS_POINT 0x10
76 #define SWS_BICUBLIN 0x40
77 #define SWS_GAUSS 0x80
78 #define SWS_SINC 0x100
79 #define SWS_LANCZOS 0x200
80 #define SWS_SPLINE 0x400
82 #define SWS_SRC_V_CHR_DROP_MASK 0x30000
83 #define SWS_SRC_V_CHR_DROP_SHIFT 16
85 #define SWS_PARAM_DEFAULT 123456
87 #define SWS_PRINT_INFO 0x1000
89 //the following 3 flags are not completely implemented
90 //internal chrominace subsampling info
91 #define SWS_FULL_CHR_H_INT 0x2000
92 //input subsampling info
93 #define SWS_FULL_CHR_H_INP 0x4000
94 #define SWS_DIRECT_BGR 0x8000
95 #define SWS_ACCURATE_RND 0x40000
96 #define SWS_BITEXACT 0x80000
98 #define SWS_CPU_CAPS_MMX 0x80000000
99 #define SWS_CPU_CAPS_MMX2 0x20000000
100 #define SWS_CPU_CAPS_3DNOW 0x40000000
101 #define SWS_CPU_CAPS_ALTIVEC 0x10000000
102 #define SWS_CPU_CAPS_BFIN 0x01000000
103 #define SWS_CPU_CAPS_SSE2 0x02000000
105 #define SWS_MAX_REDUCE_CUTOFF 0.002
107 #define SWS_CS_ITU709 1
109 #define SWS_CS_ITU601 5
110 #define SWS_CS_ITU624 5
111 #define SWS_CS_SMPTE170M 5
112 #define SWS_CS_SMPTE240M 7
113 #define SWS_CS_DEFAULT 5
116 * Returns a pointer to yuv<->rgb coefficients for the given colorspace
117 * suitable for sws_setColorspaceDetails().
119 * @param colorspace One of the SWS_CS_* macros. If invalid,
120 * SWS_CS_DEFAULT is used.
122 const int *sws_getCoefficients(int colorspace);
125 // when used for filters they must have an odd number of elements
126 // coeffs cannot be shared between vectors
128 double *coeff; ///< pointer to the list of coefficients
129 int length; ///< number of coefficients in the vector
132 // vectors can be shared
143 * Returns a positive value if pix_fmt is a supported input format, 0
146 int sws_isSupportedInput(enum PixelFormat pix_fmt);
149 * Returns a positive value if pix_fmt is a supported output format, 0
152 int sws_isSupportedOutput(enum PixelFormat pix_fmt);
155 * Allocates an empty SwsContext. This must be filled and passed to
156 * sws_init_context(). For filling see AVOptions, options.c and
157 * sws_setColorspaceDetails().
159 struct SwsContext *sws_alloc_context(void);
162 * Initializes the swscaler context sws_context.
164 * @return zero or positive value on success, a negative value on
167 int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
170 * Frees the swscaler context swsContext.
171 * If swsContext is NULL, then does nothing.
173 void sws_freeContext(struct SwsContext *swsContext);
175 #if FF_API_SWS_GETCONTEXT
177 * Allocates and returns a SwsContext. You need it to perform
178 * scaling/conversion operations using sws_scale().
180 * @param srcW the width of the source image
181 * @param srcH the height of the source image
182 * @param srcFormat the source image format
183 * @param dstW the width of the destination image
184 * @param dstH the height of the destination image
185 * @param dstFormat the destination image format
186 * @param flags specify which algorithm and options to use for rescaling
187 * @return a pointer to an allocated context, or NULL in case of error
188 * @note this function is to be removed after a saner alternative is
191 struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,
192 int dstW, int dstH, enum PixelFormat dstFormat,
193 int flags, SwsFilter *srcFilter,
194 SwsFilter *dstFilter, const double *param);
198 * Scales the image slice in srcSlice and puts the resulting scaled
199 * slice in the image in dst. A slice is a sequence of consecutive
202 * Slices have to be provided in sequential order, either in
203 * top-bottom or bottom-top order. If slices are provided in
204 * non-sequential order the behavior of the function is undefined.
206 * @param context the scaling context previously created with
208 * @param srcSlice the array containing the pointers to the planes of
210 * @param srcStride the array containing the strides for each plane of
212 * @param srcSliceY the position in the source image of the slice to
213 * process, that is the number (counted starting from
214 * zero) in the image of the first row of the slice
215 * @param srcSliceH the height of the source slice, that is the number
216 * of rows in the slice
217 * @param dst the array containing the pointers to the planes of
218 * the destination image
219 * @param dstStride the array containing the strides for each plane of
220 * the destination image
221 * @return the height of the output slice
223 int sws_scale(struct SwsContext *context, const uint8_t* const srcSlice[], const int srcStride[],
224 int srcSliceY, int srcSliceH, uint8_t* const dst[], const int dstStride[]);
227 * @param inv_table the yuv2rgb coefficients, normally ff_yuv2rgb_coeffs[x]
228 * @param fullRange if 1 then the luma range is 0..255 if 0 it is 16..235
229 * @return -1 if not supported
231 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
232 int srcRange, const int table[4], int dstRange,
233 int brightness, int contrast, int saturation);
236 * @return -1 if not supported
238 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
239 int *srcRange, int **table, int *dstRange,
240 int *brightness, int *contrast, int *saturation);
243 * Allocates and returns an uninitialized vector with length coefficients.
245 SwsVector *sws_allocVec(int length);
248 * Returns a normalized Gaussian curve used to filter stuff
249 * quality=3 is high quality, lower is lower quality.
251 SwsVector *sws_getGaussianVec(double variance, double quality);
254 * Allocates and returns a vector with length coefficients, all
255 * with the same value c.
257 SwsVector *sws_getConstVec(double c, int length);
260 * Allocates and returns a vector with just one coefficient, with
263 SwsVector *sws_getIdentityVec(void);
266 * Scales all the coefficients of a by the scalar value.
268 void sws_scaleVec(SwsVector *a, double scalar);
271 * Scales all the coefficients of a so that their sum equals height.
273 void sws_normalizeVec(SwsVector *a, double height);
274 void sws_convVec(SwsVector *a, SwsVector *b);
275 void sws_addVec(SwsVector *a, SwsVector *b);
276 void sws_subVec(SwsVector *a, SwsVector *b);
277 void sws_shiftVec(SwsVector *a, int shift);
280 * Allocates and returns a clone of the vector a, that is a vector
281 * with the same coefficients as a.
283 SwsVector *sws_cloneVec(SwsVector *a);
286 * Prints with av_log() a textual representation of the vector a
287 * if log_level <= av_log_level.
289 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
291 void sws_freeVec(SwsVector *a);
293 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
294 float lumaSharpen, float chromaSharpen,
295 float chromaHShift, float chromaVShift,
297 void sws_freeFilter(SwsFilter *filter);
300 * Checks if context can be reused, otherwise reallocates a new
303 * If context is NULL, just calls sws_getContext() to get a new
304 * context. Otherwise, checks if the parameters are the ones already
305 * saved in context. If that is the case, returns the current
306 * context. Otherwise, frees context and gets a new context with
307 * the new parameters.
309 * Be warned that srcFilter and dstFilter are not checked, they
310 * are assumed to remain the same.
312 struct SwsContext *sws_getCachedContext(struct SwsContext *context,
313 int srcW, int srcH, enum PixelFormat srcFormat,
314 int dstW, int dstH, enum PixelFormat dstFormat,
315 int flags, SwsFilter *srcFilter,
316 SwsFilter *dstFilter, const double *param);
319 * Converts an 8bit paletted frame into a frame with a color depth of 32-bits.
321 * The output frame will have the same packed format as the palette.
323 * @param src source frame buffer
324 * @param dst destination frame buffer
325 * @param num_pixels number of pixels to convert
326 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
328 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette);
331 * Converts an 8bit paletted frame into a frame with a color depth of 24 bits.
333 * With the palette format "ABCD", the destination frame ends up with the format "ABC".
335 * @param src source frame buffer
336 * @param dst destination frame buffer
337 * @param num_pixels number of pixels to convert
338 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
340 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette);
343 #endif /* SWSCALE_SWSCALE_H */