2 * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef SWSCALE_SWSCALE_H
22 #define SWSCALE_SWSCALE_H
31 * @defgroup lsws Libswscale
37 #include "libavutil/avutil.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
43 * Return the LIBSWSCALE_VERSION_INT constant.
45 unsigned swscale_version(void);
48 * Return the libswscale build-time configuration.
50 const char *swscale_configuration(void);
53 * Return the libswscale license.
55 const char *swscale_license(void);
57 /* values for the flags, the stuff on the command line is different */
58 #define SWS_FAST_BILINEAR 1
59 #define SWS_BILINEAR 2
62 #define SWS_POINT 0x10
64 #define SWS_BICUBLIN 0x40
65 #define SWS_GAUSS 0x80
66 #define SWS_SINC 0x100
67 #define SWS_LANCZOS 0x200
68 #define SWS_SPLINE 0x400
70 #define SWS_SRC_V_CHR_DROP_MASK 0x30000
71 #define SWS_SRC_V_CHR_DROP_SHIFT 16
73 #define SWS_PARAM_DEFAULT 123456
75 #define SWS_PRINT_INFO 0x1000
77 //the following 3 flags are not completely implemented
78 //internal chrominace subsampling info
79 #define SWS_FULL_CHR_H_INT 0x2000
80 //input subsampling info
81 #define SWS_FULL_CHR_H_INP 0x4000
82 #define SWS_DIRECT_BGR 0x8000
83 #define SWS_ACCURATE_RND 0x40000
84 #define SWS_BITEXACT 0x80000
85 #define SWS_ERROR_DIFFUSION 0x800000
87 #if FF_API_SWS_CPU_CAPS
89 * CPU caps are autodetected now, those flags
90 * are only provided for API compatibility.
92 #define SWS_CPU_CAPS_MMX 0x80000000
93 #define SWS_CPU_CAPS_MMXEXT 0x20000000
94 #define SWS_CPU_CAPS_MMX2 0x20000000
95 #define SWS_CPU_CAPS_3DNOW 0x40000000
96 #define SWS_CPU_CAPS_ALTIVEC 0x10000000
97 #define SWS_CPU_CAPS_BFIN 0x01000000
98 #define SWS_CPU_CAPS_SSE2 0x02000000
101 #define SWS_MAX_REDUCE_CUTOFF 0.002
103 #define SWS_CS_ITU709 1
105 #define SWS_CS_ITU601 5
106 #define SWS_CS_ITU624 5
107 #define SWS_CS_SMPTE170M 5
108 #define SWS_CS_SMPTE240M 7
109 #define SWS_CS_DEFAULT 5
112 * Return a pointer to yuv<->rgb coefficients for the given colorspace
113 * suitable for sws_setColorspaceDetails().
115 * @param colorspace One of the SWS_CS_* macros. If invalid,
116 * SWS_CS_DEFAULT is used.
118 const int *sws_getCoefficients(int colorspace);
120 // when used for filters they must have an odd number of elements
121 // coeffs cannot be shared between vectors
122 typedef struct SwsVector {
123 double *coeff; ///< pointer to the list of coefficients
124 int length; ///< number of coefficients in the vector
127 // vectors can be shared
128 typedef struct SwsFilter {
138 * Return a positive value if pix_fmt is a supported input format, 0
141 int sws_isSupportedInput(enum AVPixelFormat pix_fmt);
144 * Return a positive value if pix_fmt is a supported output format, 0
147 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);
150 * Allocate an empty SwsContext. This must be filled and passed to
151 * sws_init_context(). For filling see AVOptions, options.c and
152 * sws_setColorspaceDetails().
154 struct SwsContext *sws_alloc_context(void);
157 * Initialize the swscaler context sws_context.
159 * @return zero or positive value on success, a negative value on
162 int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
165 * Free the swscaler context swsContext.
166 * If swsContext is NULL, then does nothing.
168 void sws_freeContext(struct SwsContext *swsContext);
170 #if FF_API_SWS_GETCONTEXT
172 * Allocate and return an SwsContext. You need it to perform
173 * scaling/conversion operations using sws_scale().
175 * @param srcW the width of the source image
176 * @param srcH the height of the source image
177 * @param srcFormat the source image format
178 * @param dstW the width of the destination image
179 * @param dstH the height of the destination image
180 * @param dstFormat the destination image format
181 * @param flags specify which algorithm and options to use for rescaling
182 * @return a pointer to an allocated context, or NULL in case of error
183 * @note this function is to be removed after a saner alternative is
185 * @deprecated Use sws_getCachedContext() instead.
187 struct SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
188 int dstW, int dstH, enum AVPixelFormat dstFormat,
189 int flags, SwsFilter *srcFilter,
190 SwsFilter *dstFilter, const double *param);
194 * Scale the image slice in srcSlice and put the resulting scaled
195 * slice in the image in dst. A slice is a sequence of consecutive
198 * Slices have to be provided in sequential order, either in
199 * top-bottom or bottom-top order. If slices are provided in
200 * non-sequential order the behavior of the function is undefined.
202 * @param c the scaling context previously created with
204 * @param srcSlice the array containing the pointers to the planes of
206 * @param srcStride the array containing the strides for each plane of
208 * @param srcSliceY the position in the source image of the slice to
209 * process, that is the number (counted starting from
210 * zero) in the image of the first row of the slice
211 * @param srcSliceH the height of the source slice, that is the number
212 * of rows in the slice
213 * @param dst the array containing the pointers to the planes of
214 * the destination image
215 * @param dstStride the array containing the strides for each plane of
216 * the destination image
217 * @return the height of the output slice
219 int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
220 const int srcStride[], int srcSliceY, int srcSliceH,
221 uint8_t *const dst[], const int dstStride[]);
224 * @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
225 * @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
226 * @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
227 * @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
228 * @param brightness 16.16 fixed point brightness correction
229 * @param contrast 16.16 fixed point contrast correction
230 * @param saturation 16.16 fixed point saturation correction
231 * @return -1 if not supported
233 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
234 int srcRange, const int table[4], int dstRange,
235 int brightness, int contrast, int saturation);
238 * @return -1 if not supported
240 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
241 int *srcRange, int **table, int *dstRange,
242 int *brightness, int *contrast, int *saturation);
245 * Allocate and return an uninitialized vector with length coefficients.
247 SwsVector *sws_allocVec(int length);
250 * Return a normalized Gaussian curve used to filter stuff
251 * quality = 3 is high quality, lower is lower quality.
253 SwsVector *sws_getGaussianVec(double variance, double quality);
256 * Allocate and return a vector with length coefficients, all
257 * with the same value c.
259 SwsVector *sws_getConstVec(double c, int length);
262 * Allocate and return a vector with just one coefficient, with
265 SwsVector *sws_getIdentityVec(void);
268 * Scale all the coefficients of a by the scalar value.
270 void sws_scaleVec(SwsVector *a, double scalar);
273 * Scale all the coefficients of a so that their sum equals height.
275 void sws_normalizeVec(SwsVector *a, double height);
276 void sws_convVec(SwsVector *a, SwsVector *b);
277 void sws_addVec(SwsVector *a, SwsVector *b);
278 void sws_subVec(SwsVector *a, SwsVector *b);
279 void sws_shiftVec(SwsVector *a, int shift);
282 * Allocate and return a clone of the vector a, that is a vector
283 * with the same coefficients as a.
285 SwsVector *sws_cloneVec(SwsVector *a);
288 * Print with av_log() a textual representation of the vector a
289 * if log_level <= av_log_level.
291 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
293 void sws_freeVec(SwsVector *a);
295 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
296 float lumaSharpen, float chromaSharpen,
297 float chromaHShift, float chromaVShift,
299 void sws_freeFilter(SwsFilter *filter);
302 * Check if context can be reused, otherwise reallocate a new one.
304 * If context is NULL, just calls sws_getContext() to get a new
305 * context. Otherwise, checks if the parameters are the ones already
306 * saved in context. If that is the case, returns the current
307 * context. Otherwise, frees context and gets a new context with
308 * the new parameters.
310 * Be warned that srcFilter and dstFilter are not checked, they
311 * are assumed to remain the same.
313 struct SwsContext *sws_getCachedContext(struct SwsContext *context,
314 int srcW, int srcH, enum AVPixelFormat srcFormat,
315 int dstW, int dstH, enum AVPixelFormat dstFormat,
316 int flags, SwsFilter *srcFilter,
317 SwsFilter *dstFilter, const double *param);
320 * Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
322 * The output frame will have the same packed format as the palette.
324 * @param src source frame buffer
325 * @param dst destination frame buffer
326 * @param num_pixels number of pixels to convert
327 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
329 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
332 * Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
334 * With the palette format "ABCD", the destination frame ends up with the format "ABC".
336 * @param src source frame buffer
337 * @param dst destination frame buffer
338 * @param num_pixels number of pixels to convert
339 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
341 void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
344 * Get the AVClass for swsContext. It can be used in combination with
345 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
347 * @see av_opt_find().
349 const AVClass *sws_get_class(void);
355 #endif /* SWSCALE_SWSCALE_H */