2 * Copyright (C) 2001-2003 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
23 #define _DEFAULT_SOURCE
24 #define _SVID_SOURCE // needed for MAP_ANONYMOUS
25 #define _DARWIN_C_SOURCE // needed for MAP_ANON
32 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
33 #define MAP_ANONYMOUS MAP_ANON
37 #define WIN32_LEAN_AND_MEAN
41 #include "libavutil/attributes.h"
42 #include "libavutil/avassert.h"
43 #include "libavutil/avutil.h"
44 #include "libavutil/bswap.h"
45 #include "libavutil/cpu.h"
46 #include "libavutil/imgutils.h"
47 #include "libavutil/intreadwrite.h"
48 #include "libavutil/libm.h"
49 #include "libavutil/mathematics.h"
50 #include "libavutil/opt.h"
51 #include "libavutil/pixdesc.h"
52 #include "libavutil/aarch64/cpu.h"
53 #include "libavutil/ppc/cpu.h"
54 #include "libavutil/x86/asm.h"
55 #include "libavutil/x86/cpu.h"
59 #include "swscale_internal.h"
61 static SwsVector *sws_getIdentityVec(void);
62 static void sws_addVec(SwsVector *a, SwsVector *b);
63 static void sws_shiftVec(SwsVector *a, int shift);
64 static void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
66 static void handle_formats(SwsContext *c);
68 unsigned swscale_version(void)
70 av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);
71 return LIBSWSCALE_VERSION_INT;
74 const char *swscale_configuration(void)
76 return FFMPEG_CONFIGURATION;
79 const char *swscale_license(void)
81 #define LICENSE_PREFIX "libswscale license: "
82 return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
85 typedef struct FormatEntry {
86 uint8_t is_supported_in :1;
87 uint8_t is_supported_out :1;
88 uint8_t is_supported_endianness :1;
91 static const FormatEntry format_entries[] = {
92 [AV_PIX_FMT_YUV420P] = { 1, 1 },
93 [AV_PIX_FMT_YUYV422] = { 1, 1 },
94 [AV_PIX_FMT_RGB24] = { 1, 1 },
95 [AV_PIX_FMT_BGR24] = { 1, 1 },
96 [AV_PIX_FMT_YUV422P] = { 1, 1 },
97 [AV_PIX_FMT_YUV444P] = { 1, 1 },
98 [AV_PIX_FMT_YUV410P] = { 1, 1 },
99 [AV_PIX_FMT_YUV411P] = { 1, 1 },
100 [AV_PIX_FMT_GRAY8] = { 1, 1 },
101 [AV_PIX_FMT_MONOWHITE] = { 1, 1 },
102 [AV_PIX_FMT_MONOBLACK] = { 1, 1 },
103 [AV_PIX_FMT_PAL8] = { 1, 0 },
104 [AV_PIX_FMT_YUVJ420P] = { 1, 1 },
105 [AV_PIX_FMT_YUVJ411P] = { 1, 1 },
106 [AV_PIX_FMT_YUVJ422P] = { 1, 1 },
107 [AV_PIX_FMT_YUVJ444P] = { 1, 1 },
108 [AV_PIX_FMT_YVYU422] = { 1, 1 },
109 [AV_PIX_FMT_UYVY422] = { 1, 1 },
110 [AV_PIX_FMT_UYYVYY411] = { 0, 0 },
111 [AV_PIX_FMT_BGR8] = { 1, 1 },
112 [AV_PIX_FMT_BGR4] = { 0, 1 },
113 [AV_PIX_FMT_BGR4_BYTE] = { 1, 1 },
114 [AV_PIX_FMT_RGB8] = { 1, 1 },
115 [AV_PIX_FMT_RGB4] = { 0, 1 },
116 [AV_PIX_FMT_RGB4_BYTE] = { 1, 1 },
117 [AV_PIX_FMT_NV12] = { 1, 1 },
118 [AV_PIX_FMT_NV21] = { 1, 1 },
119 [AV_PIX_FMT_ARGB] = { 1, 1 },
120 [AV_PIX_FMT_RGBA] = { 1, 1 },
121 [AV_PIX_FMT_ABGR] = { 1, 1 },
122 [AV_PIX_FMT_BGRA] = { 1, 1 },
123 [AV_PIX_FMT_0RGB] = { 1, 1 },
124 [AV_PIX_FMT_RGB0] = { 1, 1 },
125 [AV_PIX_FMT_0BGR] = { 1, 1 },
126 [AV_PIX_FMT_BGR0] = { 1, 1 },
127 [AV_PIX_FMT_GRAY9BE] = { 1, 1 },
128 [AV_PIX_FMT_GRAY9LE] = { 1, 1 },
129 [AV_PIX_FMT_GRAY10BE] = { 1, 1 },
130 [AV_PIX_FMT_GRAY10LE] = { 1, 1 },
131 [AV_PIX_FMT_GRAY12BE] = { 1, 1 },
132 [AV_PIX_FMT_GRAY12LE] = { 1, 1 },
133 [AV_PIX_FMT_GRAY14BE] = { 1, 1 },
134 [AV_PIX_FMT_GRAY14LE] = { 1, 1 },
135 [AV_PIX_FMT_GRAY16BE] = { 1, 1 },
136 [AV_PIX_FMT_GRAY16LE] = { 1, 1 },
137 [AV_PIX_FMT_YUV440P] = { 1, 1 },
138 [AV_PIX_FMT_YUVJ440P] = { 1, 1 },
139 [AV_PIX_FMT_YUV440P10LE] = { 1, 1 },
140 [AV_PIX_FMT_YUV440P10BE] = { 1, 1 },
141 [AV_PIX_FMT_YUV440P12LE] = { 1, 1 },
142 [AV_PIX_FMT_YUV440P12BE] = { 1, 1 },
143 [AV_PIX_FMT_YUVA420P] = { 1, 1 },
144 [AV_PIX_FMT_YUVA422P] = { 1, 1 },
145 [AV_PIX_FMT_YUVA444P] = { 1, 1 },
146 [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
147 [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
148 [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
149 [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
150 [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
151 [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
152 [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
153 [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
154 [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
155 [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
156 [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
157 [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
158 [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
159 [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
160 [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
161 [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
162 [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
163 [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },
164 [AV_PIX_FMT_RGB48BE] = { 1, 1 },
165 [AV_PIX_FMT_RGB48LE] = { 1, 1 },
166 [AV_PIX_FMT_RGBA64BE] = { 1, 1, 1 },
167 [AV_PIX_FMT_RGBA64LE] = { 1, 1, 1 },
168 [AV_PIX_FMT_RGB565BE] = { 1, 1 },
169 [AV_PIX_FMT_RGB565LE] = { 1, 1 },
170 [AV_PIX_FMT_RGB555BE] = { 1, 1 },
171 [AV_PIX_FMT_RGB555LE] = { 1, 1 },
172 [AV_PIX_FMT_BGR565BE] = { 1, 1 },
173 [AV_PIX_FMT_BGR565LE] = { 1, 1 },
174 [AV_PIX_FMT_BGR555BE] = { 1, 1 },
175 [AV_PIX_FMT_BGR555LE] = { 1, 1 },
176 [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
177 [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
178 [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
179 [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
180 [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
181 [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
182 [AV_PIX_FMT_RGB444LE] = { 1, 1 },
183 [AV_PIX_FMT_RGB444BE] = { 1, 1 },
184 [AV_PIX_FMT_BGR444LE] = { 1, 1 },
185 [AV_PIX_FMT_BGR444BE] = { 1, 1 },
186 [AV_PIX_FMT_YA8] = { 1, 1 },
187 [AV_PIX_FMT_YA16BE] = { 1, 1 },
188 [AV_PIX_FMT_YA16LE] = { 1, 1 },
189 [AV_PIX_FMT_BGR48BE] = { 1, 1 },
190 [AV_PIX_FMT_BGR48LE] = { 1, 1 },
191 [AV_PIX_FMT_BGRA64BE] = { 1, 1, 1 },
192 [AV_PIX_FMT_BGRA64LE] = { 1, 1, 1 },
193 [AV_PIX_FMT_YUV420P9BE] = { 1, 1 },
194 [AV_PIX_FMT_YUV420P9LE] = { 1, 1 },
195 [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
196 [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },
197 [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
198 [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
199 [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
200 [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },
201 [AV_PIX_FMT_YUV422P9BE] = { 1, 1 },
202 [AV_PIX_FMT_YUV422P9LE] = { 1, 1 },
203 [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
204 [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },
205 [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
206 [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
207 [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
208 [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },
209 [AV_PIX_FMT_YUV444P9BE] = { 1, 1 },
210 [AV_PIX_FMT_YUV444P9LE] = { 1, 1 },
211 [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
212 [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },
213 [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
214 [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
215 [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
216 [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },
217 [AV_PIX_FMT_GBRP] = { 1, 1 },
218 [AV_PIX_FMT_GBRP9LE] = { 1, 1 },
219 [AV_PIX_FMT_GBRP9BE] = { 1, 1 },
220 [AV_PIX_FMT_GBRP10LE] = { 1, 1 },
221 [AV_PIX_FMT_GBRP10BE] = { 1, 1 },
222 [AV_PIX_FMT_GBRAP10LE] = { 1, 1 },
223 [AV_PIX_FMT_GBRAP10BE] = { 1, 1 },
224 [AV_PIX_FMT_GBRP12LE] = { 1, 1 },
225 [AV_PIX_FMT_GBRP12BE] = { 1, 1 },
226 [AV_PIX_FMT_GBRAP12LE] = { 1, 1 },
227 [AV_PIX_FMT_GBRAP12BE] = { 1, 1 },
228 [AV_PIX_FMT_GBRP14LE] = { 1, 1 },
229 [AV_PIX_FMT_GBRP14BE] = { 1, 1 },
230 [AV_PIX_FMT_GBRP16LE] = { 1, 1 },
231 [AV_PIX_FMT_GBRP16BE] = { 1, 1 },
232 [AV_PIX_FMT_GBRPF32LE] = { 1, 1 },
233 [AV_PIX_FMT_GBRPF32BE] = { 1, 1 },
234 [AV_PIX_FMT_GBRAPF32LE] = { 1, 1 },
235 [AV_PIX_FMT_GBRAPF32BE] = { 1, 1 },
236 [AV_PIX_FMT_GBRAP] = { 1, 1 },
237 [AV_PIX_FMT_GBRAP16LE] = { 1, 1 },
238 [AV_PIX_FMT_GBRAP16BE] = { 1, 1 },
239 [AV_PIX_FMT_BAYER_BGGR8] = { 1, 0 },
240 [AV_PIX_FMT_BAYER_RGGB8] = { 1, 0 },
241 [AV_PIX_FMT_BAYER_GBRG8] = { 1, 0 },
242 [AV_PIX_FMT_BAYER_GRBG8] = { 1, 0 },
243 [AV_PIX_FMT_BAYER_BGGR16LE] = { 1, 0 },
244 [AV_PIX_FMT_BAYER_BGGR16BE] = { 1, 0 },
245 [AV_PIX_FMT_BAYER_RGGB16LE] = { 1, 0 },
246 [AV_PIX_FMT_BAYER_RGGB16BE] = { 1, 0 },
247 [AV_PIX_FMT_BAYER_GBRG16LE] = { 1, 0 },
248 [AV_PIX_FMT_BAYER_GBRG16BE] = { 1, 0 },
249 [AV_PIX_FMT_BAYER_GRBG16LE] = { 1, 0 },
250 [AV_PIX_FMT_BAYER_GRBG16BE] = { 1, 0 },
251 [AV_PIX_FMT_XYZ12BE] = { 1, 1, 1 },
252 [AV_PIX_FMT_XYZ12LE] = { 1, 1, 1 },
253 [AV_PIX_FMT_AYUV64LE] = { 1, 1},
254 [AV_PIX_FMT_P010LE] = { 1, 1 },
255 [AV_PIX_FMT_P010BE] = { 1, 1 },
256 [AV_PIX_FMT_P016LE] = { 1, 1 },
257 [AV_PIX_FMT_P016BE] = { 1, 1 },
258 [AV_PIX_FMT_GRAYF32LE] = { 1, 1 },
259 [AV_PIX_FMT_GRAYF32BE] = { 1, 1 },
260 [AV_PIX_FMT_YUVA422P12BE] = { 1, 1 },
261 [AV_PIX_FMT_YUVA422P12LE] = { 1, 1 },
262 [AV_PIX_FMT_YUVA444P12BE] = { 1, 1 },
263 [AV_PIX_FMT_YUVA444P12LE] = { 1, 1 },
264 [AV_PIX_FMT_NV24] = { 1, 1 },
265 [AV_PIX_FMT_NV42] = { 1, 1 },
266 [AV_PIX_FMT_Y210LE] = { 1, 0 },
267 [AV_PIX_FMT_X2RGB10LE] = { 1, 1 },
270 int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
272 return (unsigned)pix_fmt < FF_ARRAY_ELEMS(format_entries) ?
273 format_entries[pix_fmt].is_supported_in : 0;
276 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
278 return (unsigned)pix_fmt < FF_ARRAY_ELEMS(format_entries) ?
279 format_entries[pix_fmt].is_supported_out : 0;
282 int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
284 return (unsigned)pix_fmt < FF_ARRAY_ELEMS(format_entries) ?
285 format_entries[pix_fmt].is_supported_endianness : 0;
288 static double getSplineCoeff(double a, double b, double c, double d,
292 return ((d * dist + c) * dist + b) * dist + a;
294 return getSplineCoeff(0.0,
295 b + 2.0 * c + 3.0 * d,
297 -b - 3.0 * c - 6.0 * d,
301 static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)
303 if (pos == -1 || pos <= -513) {
304 pos = (128 << chr_subsample) - 128;
306 pos += 128; // relative to ideal left edge
307 return pos >> chr_subsample;
311 int flag; ///< flag associated to the algorithm
312 const char *description; ///< human-readable description
313 int size_factor; ///< size factor used when initing the filters
316 static const ScaleAlgorithm scale_algorithms[] = {
317 { SWS_AREA, "area averaging", 1 /* downscale only, for upscale it is bilinear */ },
318 { SWS_BICUBIC, "bicubic", 4 },
319 { SWS_BICUBLIN, "luma bicubic / chroma bilinear", -1 },
320 { SWS_BILINEAR, "bilinear", 2 },
321 { SWS_FAST_BILINEAR, "fast bilinear", -1 },
322 { SWS_GAUSS, "Gaussian", 8 /* infinite ;) */ },
323 { SWS_LANCZOS, "Lanczos", -1 /* custom */ },
324 { SWS_POINT, "nearest neighbor / point", -1 },
325 { SWS_SINC, "sinc", 20 /* infinite ;) */ },
326 { SWS_SPLINE, "bicubic spline", 20 /* infinite :)*/ },
327 { SWS_X, "experimental", 8 },
330 static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
331 int *outFilterSize, int xInc, int srcW,
332 int dstW, int filterAlign, int one,
333 int flags, int cpu_flags,
334 SwsVector *srcFilter, SwsVector *dstFilter,
335 double param[2], int srcPos, int dstPos)
341 int64_t *filter = NULL;
342 int64_t *filter2 = NULL;
343 const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
346 emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
348 // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
349 if (!FF_ALLOC_TYPED_ARRAY(*filterPos, dstW + 3))
352 if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
355 if (!FF_ALLOCZ_TYPED_ARRAY(filter, dstW * filterSize))
358 for (i = 0; i < dstW; i++) {
359 filter[i * filterSize] = fone;
362 } else if (flags & SWS_POINT) { // lame looking point sampling mode
366 if (!FF_ALLOC_TYPED_ARRAY(filter, dstW * filterSize))
369 xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
370 for (i = 0; i < dstW; i++) {
371 int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
373 (*filterPos)[i] = xx;
377 } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
378 (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
382 if (!FF_ALLOC_TYPED_ARRAY(filter, dstW * filterSize))
385 xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
386 for (i = 0; i < dstW; i++) {
387 int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
390 (*filterPos)[i] = xx;
391 // bilinear upscale / linear interpolate / area averaging
392 for (j = 0; j < filterSize; j++) {
393 int64_t coeff = fone - FFABS((int64_t)xx * (1 << 16) - xDstInSrc) * (fone >> 16);
396 filter[i * filterSize + j] = coeff;
405 for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
406 if (flags & scale_algorithms[i].flag && scale_algorithms[i].size_factor > 0) {
407 sizeFactor = scale_algorithms[i].size_factor;
411 if (flags & SWS_LANCZOS)
412 sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
413 av_assert0(sizeFactor > 0);
416 filterSize = 1 + sizeFactor; // upscale
418 filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;
420 filterSize = FFMIN(filterSize, srcW - 2);
421 filterSize = FFMAX(filterSize, 1);
423 if (!FF_ALLOC_TYPED_ARRAY(filter, dstW * filterSize))
425 xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);
426 for (i = 0; i < dstW; i++) {
427 int xx = (xDstInSrc - (filterSize - 2) * (1LL<<16)) / (1 << 17);
429 (*filterPos)[i] = xx;
430 for (j = 0; j < filterSize; j++) {
431 int64_t d = (FFABS(((int64_t)xx * (1 << 17)) - xDstInSrc)) << 13;
437 floatd = d * (1.0 / (1 << 30));
439 if (flags & SWS_BICUBIC) {
440 int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] : 0) * (1 << 24);
441 int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);
443 if (d >= 1LL << 31) {
446 int64_t dd = (d * d) >> 30;
447 int64_t ddd = (dd * d) >> 30;
450 coeff = (12 * (1 << 24) - 9 * B - 6 * C) * ddd +
451 (-18 * (1 << 24) + 12 * B + 6 * C) * dd +
452 (6 * (1 << 24) - 2 * B) * (1 << 30);
454 coeff = (-B - 6 * C) * ddd +
455 (6 * B + 30 * C) * dd +
456 (-12 * B - 48 * C) * d +
457 (8 * B + 24 * C) * (1 << 30);
459 coeff /= (1LL<<54)/fone;
460 } else if (flags & SWS_X) {
461 double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
465 c = cos(floatd * M_PI);
472 coeff = (c * 0.5 + 0.5) * fone;
473 } else if (flags & SWS_AREA) {
474 int64_t d2 = d - (1 << 29);
475 if (d2 * xInc < -(1LL << (29 + 16)))
476 coeff = 1.0 * (1LL << (30 + 16));
477 else if (d2 * xInc < (1LL << (29 + 16)))
478 coeff = -d2 * xInc + (1LL << (29 + 16));
481 coeff *= fone >> (30 + 16);
482 } else if (flags & SWS_GAUSS) {
483 double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
484 coeff = exp2(-p * floatd * floatd) * fone;
485 } else if (flags & SWS_SINC) {
486 coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
487 } else if (flags & SWS_LANCZOS) {
488 double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
489 coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
490 (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
493 } else if (flags & SWS_BILINEAR) {
494 coeff = (1 << 30) - d;
498 } else if (flags & SWS_SPLINE) {
499 double p = -2.196152422706632;
500 coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
505 filter[i * filterSize + j] = coeff;
508 xDstInSrc += 2 * xInc;
512 /* apply src & dst Filter to filter -> filter2
515 av_assert0(filterSize > 0);
516 filter2Size = filterSize;
518 filter2Size += srcFilter->length - 1;
520 filter2Size += dstFilter->length - 1;
521 av_assert0(filter2Size > 0);
522 if (!FF_ALLOCZ_TYPED_ARRAY(filter2, dstW * filter2Size))
524 for (i = 0; i < dstW; i++) {
528 for (k = 0; k < srcFilter->length; k++) {
529 for (j = 0; j < filterSize; j++)
530 filter2[i * filter2Size + k + j] +=
531 srcFilter->coeff[k] * filter[i * filterSize + j];
534 for (j = 0; j < filterSize; j++)
535 filter2[i * filter2Size + j] = filter[i * filterSize + j];
539 (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
543 /* try to reduce the filter-size (step1 find size and shift left) */
544 // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
546 for (i = dstW - 1; i >= 0; i--) {
547 int min = filter2Size;
549 int64_t cutOff = 0.0;
551 /* get rid of near zero elements on the left by shifting left */
552 for (j = 0; j < filter2Size; j++) {
554 cutOff += FFABS(filter2[i * filter2Size]);
556 if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
559 /* preserve monotonicity because the core can't handle the
560 * filter otherwise */
561 if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
564 // move filter coefficients left
565 for (k = 1; k < filter2Size; k++)
566 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
567 filter2[i * filter2Size + k - 1] = 0;
572 /* count near zeros on the right */
573 for (j = filter2Size - 1; j > 0; j--) {
574 cutOff += FFABS(filter2[i * filter2Size + j]);
576 if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
581 if (min > minFilterSize)
585 if (PPC_ALTIVEC(cpu_flags)) {
586 // we can handle the special case 4, so we don't want to go the full 8
587 if (minFilterSize < 5)
590 /* We really don't want to waste our time doing useless computation, so
591 * fall back on the scalar C code for very small filters.
592 * Vectorizing is worth it only if you have a decent-sized vector. */
593 if (minFilterSize < 3)
597 if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {
598 // special case for unscaled vertical filtering
599 if (minFilterSize == 1 && filterAlign == 2)
603 av_assert0(minFilterSize > 0);
604 filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
605 av_assert0(filterSize > 0);
606 filter = av_malloc_array(dstW, filterSize * sizeof(*filter));
609 if (filterSize >= MAX_FILTER_SIZE * 16 /
610 ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {
611 ret = RETCODE_USE_CASCADE;
614 *outFilterSize = filterSize;
616 if (flags & SWS_PRINT_INFO)
617 av_log(NULL, AV_LOG_VERBOSE,
618 "SwScaler: reducing / aligning filtersize %d -> %d\n",
619 filter2Size, filterSize);
620 /* try to reduce the filter-size (step2 reduce it) */
621 for (i = 0; i < dstW; i++) {
624 for (j = 0; j < filterSize; j++) {
625 if (j >= filter2Size)
626 filter[i * filterSize + j] = 0;
628 filter[i * filterSize + j] = filter2[i * filter2Size + j];
629 if ((flags & SWS_BITEXACT) && j >= minFilterSize)
630 filter[i * filterSize + j] = 0;
634 // FIXME try to align filterPos if possible
637 for (i = 0; i < dstW; i++) {
639 if ((*filterPos)[i] < 0) {
640 // move filter coefficients left to compensate for filterPos
641 for (j = 1; j < filterSize; j++) {
642 int left = FFMAX(j + (*filterPos)[i], 0);
643 filter[i * filterSize + left] += filter[i * filterSize + j];
644 filter[i * filterSize + j] = 0;
649 if ((*filterPos)[i] + filterSize > srcW) {
650 int shift = (*filterPos)[i] + FFMIN(filterSize - srcW, 0);
653 for (j = filterSize - 1; j >= 0; j--) {
654 if ((*filterPos)[i] + j >= srcW) {
655 acc += filter[i * filterSize + j];
656 filter[i * filterSize + j] = 0;
659 for (j = filterSize - 1; j >= 0; j--) {
661 filter[i * filterSize + j] = 0;
663 filter[i * filterSize + j] = filter[i * filterSize + j - shift];
667 (*filterPos)[i]-= shift;
668 filter[i * filterSize + srcW - 1 - (*filterPos)[i]] += acc;
670 av_assert0((*filterPos)[i] >= 0);
671 av_assert0((*filterPos)[i] < srcW);
672 if ((*filterPos)[i] + filterSize > srcW) {
673 for (j = 0; j < filterSize; j++) {
674 av_assert0((*filterPos)[i] + j < srcW || !filter[i * filterSize + j]);
679 // Note the +1 is for the MMX scaler which reads over the end
680 /* align at 16 for AltiVec (needed by hScale_altivec_real) */
681 if (!FF_ALLOCZ_TYPED_ARRAY(*outFilter, *outFilterSize * (dstW + 3)))
684 /* normalize & store in outFilter */
685 for (i = 0; i < dstW; i++) {
690 for (j = 0; j < filterSize; j++) {
691 sum += filter[i * filterSize + j];
693 sum = (sum + one / 2) / one;
695 av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");
698 for (j = 0; j < *outFilterSize; j++) {
699 int64_t v = filter[i * filterSize + j] + error;
700 int intV = ROUNDED_DIV(v, sum);
701 (*outFilter)[i * (*outFilterSize) + j] = intV;
702 error = v - intV * sum;
706 (*filterPos)[dstW + 0] =
707 (*filterPos)[dstW + 1] =
708 (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
709 * read over the end */
710 for (i = 0; i < *outFilterSize; i++) {
711 int k = (dstW - 1) * (*outFilterSize) + i;
712 (*outFilter)[k + 1 * (*outFilterSize)] =
713 (*outFilter)[k + 2 * (*outFilterSize)] =
714 (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
720 ret = AVERROR(ENOMEM);
723 av_log(NULL, ret == RETCODE_USE_CASCADE ? AV_LOG_DEBUG : AV_LOG_ERROR, "sws: initFilter failed\n");
730 static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
732 int64_t W, V, Z, Cy, Cu, Cv;
733 int64_t vr = table[0];
734 int64_t ub = table[1];
735 int64_t ug = -table[2];
736 int64_t vg = -table[3];
739 uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
741 static const int8_t map[] = {
742 BY_IDX, GY_IDX, -1 , BY_IDX, BY_IDX, GY_IDX, -1 , BY_IDX,
743 RY_IDX, -1 , GY_IDX, RY_IDX, RY_IDX, -1 , GY_IDX, RY_IDX,
744 RY_IDX, GY_IDX, -1 , RY_IDX, RY_IDX, GY_IDX, -1 , RY_IDX,
745 BY_IDX, -1 , GY_IDX, BY_IDX, BY_IDX, -1 , GY_IDX, BY_IDX,
746 BU_IDX, GU_IDX, -1 , BU_IDX, BU_IDX, GU_IDX, -1 , BU_IDX,
747 RU_IDX, -1 , GU_IDX, RU_IDX, RU_IDX, -1 , GU_IDX, RU_IDX,
748 RU_IDX, GU_IDX, -1 , RU_IDX, RU_IDX, GU_IDX, -1 , RU_IDX,
749 BU_IDX, -1 , GU_IDX, BU_IDX, BU_IDX, -1 , GU_IDX, BU_IDX,
750 BV_IDX, GV_IDX, -1 , BV_IDX, BV_IDX, GV_IDX, -1 , BV_IDX,
751 RV_IDX, -1 , GV_IDX, RV_IDX, RV_IDX, -1 , GV_IDX, RV_IDX,
752 RV_IDX, GV_IDX, -1 , RV_IDX, RV_IDX, GV_IDX, -1 , RV_IDX,
753 BV_IDX, -1 , GV_IDX, BV_IDX, BV_IDX, -1 , GV_IDX, BV_IDX,
754 RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
755 BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
756 GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 ,
757 -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX,
758 RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
759 BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
760 GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 ,
761 -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX,
762 RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
763 BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
764 GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 ,
765 -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, //23
766 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //24
767 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //25
768 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //26
769 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //27
770 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //28
771 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //29
772 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //30
773 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //31
774 BY_IDX, GY_IDX, RY_IDX, -1 , -1 , -1 , -1 , -1 , //32
775 BU_IDX, GU_IDX, RU_IDX, -1 , -1 , -1 , -1 , -1 , //33
776 BV_IDX, GV_IDX, RV_IDX, -1 , -1 , -1 , -1 , -1 , //34
779 dstRange = 0; //FIXME range = 1 is handled elsewhere
789 W = ROUNDED_DIV(ONE*ONE*ug, ub);
790 V = ROUNDED_DIV(ONE*ONE*vg, vr);
793 Cy = ROUNDED_DIV(cy*Z, ONE);
794 Cu = ROUNDED_DIV(ub*Z, ONE);
795 Cv = ROUNDED_DIV(vr*Z, ONE);
797 c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cy);
798 c->input_rgb2yuv_table[GY_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cy);
799 c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cy);
801 c->input_rgb2yuv_table[RU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cu);
802 c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cu);
803 c->input_rgb2yuv_table[BU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W) , Cu);
805 c->input_rgb2yuv_table[RV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z) , Cv);
806 c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cv);
807 c->input_rgb2yuv_table[BV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cv);
809 if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {
810 c->input_rgb2yuv_table[BY_IDX] = ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
811 c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
812 c->input_rgb2yuv_table[BU_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
813 c->input_rgb2yuv_table[GY_IDX] = ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
814 c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
815 c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
816 c->input_rgb2yuv_table[RY_IDX] = ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
817 c->input_rgb2yuv_table[RV_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
818 c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
820 for(i=0; i<FF_ARRAY_ELEMS(map); i++)
821 AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
824 static void fill_xyztables(struct SwsContext *c)
827 double xyzgamma = XYZ_GAMMA;
828 double rgbgamma = 1.0 / RGB_GAMMA;
829 double xyzgammainv = 1.0 / XYZ_GAMMA;
830 double rgbgammainv = RGB_GAMMA;
831 static const int16_t xyz2rgb_matrix[3][4] = {
832 {13270, -6295, -2041},
834 { 228, -835, 4329} };
835 static const int16_t rgb2xyz_matrix[3][4] = {
839 static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];
841 memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
842 memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
843 c->xyzgamma = xyzgamma_tab;
844 c->rgbgamma = rgbgamma_tab;
845 c->xyzgammainv = xyzgammainv_tab;
846 c->rgbgammainv = rgbgammainv_tab;
848 if (rgbgamma_tab[4095])
851 /* set gamma vectors */
852 for (i = 0; i < 4096; i++) {
853 xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
854 rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
855 xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);
856 rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);
860 static int range_override_needed(enum AVPixelFormat format)
862 return !isYUV(format) && !isGray(format);
865 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
866 int srcRange, const int table[4], int dstRange,
867 int brightness, int contrast, int saturation)
869 const AVPixFmtDescriptor *desc_dst;
870 const AVPixFmtDescriptor *desc_src;
874 desc_dst = av_pix_fmt_desc_get(c->dstFormat);
875 desc_src = av_pix_fmt_desc_get(c->srcFormat);
877 if(range_override_needed(c->dstFormat))
879 if(range_override_needed(c->srcFormat))
882 if (c->srcRange != srcRange ||
883 c->dstRange != dstRange ||
884 c->brightness != brightness ||
885 c->contrast != contrast ||
886 c->saturation != saturation ||
887 memcmp(c->srcColorspaceTable, inv_table, sizeof(int) * 4) ||
888 memcmp(c->dstColorspaceTable, table, sizeof(int) * 4)
892 memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
893 memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
897 c->brightness = brightness;
898 c->contrast = contrast;
899 c->saturation = saturation;
900 c->srcRange = srcRange;
901 c->dstRange = dstRange;
903 //The srcBpc check is possibly wrong but we seem to lack a definitive reference to test this
904 //and what we have in ticket 2939 looks better with this check
905 if (need_reinit && (c->srcBpc == 8 || !isYUV(c->srcFormat)))
906 ff_sws_init_range_convert(c);
908 c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
909 c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
911 if (c->cascaded_context[c->cascaded_mainindex])
912 return sws_setColorspaceDetails(c->cascaded_context[c->cascaded_mainindex],inv_table, srcRange,table, dstRange, brightness, contrast, saturation);
917 if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat))) {
918 if (!c->cascaded_context[0] &&
919 memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&
920 c->srcW && c->srcH && c->dstW && c->dstH) {
921 enum AVPixelFormat tmp_format;
922 int tmp_width, tmp_height;
928 av_log(c, AV_LOG_VERBOSE, "YUV color matrix differs for YUV->YUV, using intermediate RGB to convert\n");
930 if (isNBPS(c->dstFormat) || is16BPS(c->dstFormat)) {
931 if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
932 tmp_format = AV_PIX_FMT_BGRA64;
934 tmp_format = AV_PIX_FMT_BGR48;
937 if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
938 tmp_format = AV_PIX_FMT_BGRA;
940 tmp_format = AV_PIX_FMT_BGR24;
944 if (srcW*srcH > dstW*dstH) {
952 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
953 tmp_width, tmp_height, tmp_format, 64);
957 c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, c->srcFormat,
958 tmp_width, tmp_height, tmp_format,
960 if (!c->cascaded_context[0])
963 c->cascaded_context[0]->alphablend = c->alphablend;
964 ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
967 //we set both src and dst depending on that the RGB side will be ignored
968 sws_setColorspaceDetails(c->cascaded_context[0], inv_table,
969 srcRange, table, dstRange,
970 brightness, contrast, saturation);
972 c->cascaded_context[1] = sws_getContext(tmp_width, tmp_height, tmp_format,
973 dstW, dstH, c->dstFormat,
974 c->flags, NULL, NULL, c->param);
975 if (!c->cascaded_context[1])
977 sws_setColorspaceDetails(c->cascaded_context[1], inv_table,
978 srcRange, table, dstRange,
979 0, 1 << 16, 1 << 16);
985 if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
986 ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
987 contrast, saturation);
991 ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,
992 contrast, saturation);
995 fill_rgb2yuv_table(c, table, dstRange);
1000 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
1001 int *srcRange, int **table, int *dstRange,
1002 int *brightness, int *contrast, int *saturation)
1007 *inv_table = c->srcColorspaceTable;
1008 *table = c->dstColorspaceTable;
1009 *srcRange = range_override_needed(c->srcFormat) ? 1 : c->srcRange;
1010 *dstRange = range_override_needed(c->dstFormat) ? 1 : c->dstRange;
1011 *brightness = c->brightness;
1012 *contrast = c->contrast;
1013 *saturation = c->saturation;
1018 static int handle_jpeg(enum AVPixelFormat *format)
1021 case AV_PIX_FMT_YUVJ420P:
1022 *format = AV_PIX_FMT_YUV420P;
1024 case AV_PIX_FMT_YUVJ411P:
1025 *format = AV_PIX_FMT_YUV411P;
1027 case AV_PIX_FMT_YUVJ422P:
1028 *format = AV_PIX_FMT_YUV422P;
1030 case AV_PIX_FMT_YUVJ444P:
1031 *format = AV_PIX_FMT_YUV444P;
1033 case AV_PIX_FMT_YUVJ440P:
1034 *format = AV_PIX_FMT_YUV440P;
1036 case AV_PIX_FMT_GRAY8:
1037 case AV_PIX_FMT_YA8:
1038 case AV_PIX_FMT_GRAY9LE:
1039 case AV_PIX_FMT_GRAY9BE:
1040 case AV_PIX_FMT_GRAY10LE:
1041 case AV_PIX_FMT_GRAY10BE:
1042 case AV_PIX_FMT_GRAY12LE:
1043 case AV_PIX_FMT_GRAY12BE:
1044 case AV_PIX_FMT_GRAY14LE:
1045 case AV_PIX_FMT_GRAY14BE:
1046 case AV_PIX_FMT_GRAY16LE:
1047 case AV_PIX_FMT_GRAY16BE:
1048 case AV_PIX_FMT_YA16BE:
1049 case AV_PIX_FMT_YA16LE:
1056 static int handle_0alpha(enum AVPixelFormat *format)
1059 case AV_PIX_FMT_0BGR : *format = AV_PIX_FMT_ABGR ; return 1;
1060 case AV_PIX_FMT_BGR0 : *format = AV_PIX_FMT_BGRA ; return 4;
1061 case AV_PIX_FMT_0RGB : *format = AV_PIX_FMT_ARGB ; return 1;
1062 case AV_PIX_FMT_RGB0 : *format = AV_PIX_FMT_RGBA ; return 4;
1067 static int handle_xyz(enum AVPixelFormat *format)
1070 case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;
1071 case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;
1076 static void handle_formats(SwsContext *c)
1078 c->src0Alpha |= handle_0alpha(&c->srcFormat);
1079 c->dst0Alpha |= handle_0alpha(&c->dstFormat);
1080 c->srcXYZ |= handle_xyz(&c->srcFormat);
1081 c->dstXYZ |= handle_xyz(&c->dstFormat);
1082 if (c->srcXYZ || c->dstXYZ)
1086 SwsContext *sws_alloc_context(void)
1088 SwsContext *c = av_mallocz(sizeof(SwsContext));
1090 av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));
1093 c->av_class = &ff_sws_context_class;
1094 av_opt_set_defaults(c);
1100 static uint16_t * alloc_gamma_tbl(double e)
1104 tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);
1108 for (i = 0; i < 65536; ++i) {
1109 tbl[i] = pow(i / 65535.0, e) * 65535.0;
1114 static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)
1117 case AV_PIX_FMT_ARGB: return AV_PIX_FMT_RGB24;
1118 case AV_PIX_FMT_RGBA: return AV_PIX_FMT_RGB24;
1119 case AV_PIX_FMT_ABGR: return AV_PIX_FMT_BGR24;
1120 case AV_PIX_FMT_BGRA: return AV_PIX_FMT_BGR24;
1121 case AV_PIX_FMT_YA8: return AV_PIX_FMT_GRAY8;
1123 case AV_PIX_FMT_YUVA420P: return AV_PIX_FMT_YUV420P;
1124 case AV_PIX_FMT_YUVA422P: return AV_PIX_FMT_YUV422P;
1125 case AV_PIX_FMT_YUVA444P: return AV_PIX_FMT_YUV444P;
1127 case AV_PIX_FMT_GBRAP: return AV_PIX_FMT_GBRP;
1129 case AV_PIX_FMT_GBRAP10LE: return AV_PIX_FMT_GBRP10;
1130 case AV_PIX_FMT_GBRAP10BE: return AV_PIX_FMT_GBRP10;
1132 case AV_PIX_FMT_GBRAP12LE: return AV_PIX_FMT_GBRP12;
1133 case AV_PIX_FMT_GBRAP12BE: return AV_PIX_FMT_GBRP12;
1135 case AV_PIX_FMT_GBRAP16LE: return AV_PIX_FMT_GBRP16;
1136 case AV_PIX_FMT_GBRAP16BE: return AV_PIX_FMT_GBRP16;
1138 case AV_PIX_FMT_RGBA64LE: return AV_PIX_FMT_RGB48;
1139 case AV_PIX_FMT_RGBA64BE: return AV_PIX_FMT_RGB48;
1140 case AV_PIX_FMT_BGRA64LE: return AV_PIX_FMT_BGR48;
1141 case AV_PIX_FMT_BGRA64BE: return AV_PIX_FMT_BGR48;
1143 case AV_PIX_FMT_YA16BE: return AV_PIX_FMT_GRAY16;
1144 case AV_PIX_FMT_YA16LE: return AV_PIX_FMT_GRAY16;
1146 case AV_PIX_FMT_YUVA420P9BE: return AV_PIX_FMT_YUV420P9;
1147 case AV_PIX_FMT_YUVA422P9BE: return AV_PIX_FMT_YUV422P9;
1148 case AV_PIX_FMT_YUVA444P9BE: return AV_PIX_FMT_YUV444P9;
1149 case AV_PIX_FMT_YUVA420P9LE: return AV_PIX_FMT_YUV420P9;
1150 case AV_PIX_FMT_YUVA422P9LE: return AV_PIX_FMT_YUV422P9;
1151 case AV_PIX_FMT_YUVA444P9LE: return AV_PIX_FMT_YUV444P9;
1152 case AV_PIX_FMT_YUVA420P10BE: return AV_PIX_FMT_YUV420P10;
1153 case AV_PIX_FMT_YUVA422P10BE: return AV_PIX_FMT_YUV422P10;
1154 case AV_PIX_FMT_YUVA444P10BE: return AV_PIX_FMT_YUV444P10;
1155 case AV_PIX_FMT_YUVA420P10LE: return AV_PIX_FMT_YUV420P10;
1156 case AV_PIX_FMT_YUVA422P10LE: return AV_PIX_FMT_YUV422P10;
1157 case AV_PIX_FMT_YUVA444P10LE: return AV_PIX_FMT_YUV444P10;
1158 case AV_PIX_FMT_YUVA420P16BE: return AV_PIX_FMT_YUV420P16;
1159 case AV_PIX_FMT_YUVA422P16BE: return AV_PIX_FMT_YUV422P16;
1160 case AV_PIX_FMT_YUVA444P16BE: return AV_PIX_FMT_YUV444P16;
1161 case AV_PIX_FMT_YUVA420P16LE: return AV_PIX_FMT_YUV420P16;
1162 case AV_PIX_FMT_YUVA422P16LE: return AV_PIX_FMT_YUV422P16;
1163 case AV_PIX_FMT_YUVA444P16LE: return AV_PIX_FMT_YUV444P16;
1165 // case AV_PIX_FMT_AYUV64LE:
1166 // case AV_PIX_FMT_AYUV64BE:
1167 // case AV_PIX_FMT_PAL8:
1168 default: return AV_PIX_FMT_NONE;
1172 av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
1173 SwsFilter *dstFilter)
1176 int usesVFilter, usesHFilter;
1178 SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };
1183 int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 66, 16);
1184 int flags, cpu_flags;
1185 enum AVPixelFormat srcFormat = c->srcFormat;
1186 enum AVPixelFormat dstFormat = c->dstFormat;
1187 const AVPixFmtDescriptor *desc_src;
1188 const AVPixFmtDescriptor *desc_dst;
1190 enum AVPixelFormat tmpFmt;
1191 static const float float_mult = 1.0f / 255.0f;
1193 cpu_flags = av_get_cpu_flags();
1197 ff_sws_rgb2rgb_init();
1199 unscaled = (srcW == dstW && srcH == dstH);
1201 c->srcRange |= handle_jpeg(&c->srcFormat);
1202 c->dstRange |= handle_jpeg(&c->dstFormat);
1204 if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
1205 av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
1207 if (!c->contrast && !c->saturation && !c->dstFormatBpp)
1208 sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
1209 ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
1210 c->dstRange, 0, 1 << 16, 1 << 16);
1213 srcFormat = c->srcFormat;
1214 dstFormat = c->dstFormat;
1215 desc_src = av_pix_fmt_desc_get(srcFormat);
1216 desc_dst = av_pix_fmt_desc_get(dstFormat);
1218 // If the source has no alpha then disable alpha blendaway
1220 c->alphablend = SWS_ALPHA_BLEND_NONE;
1222 if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
1223 av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
1224 if (!sws_isSupportedInput(srcFormat)) {
1225 av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
1226 av_get_pix_fmt_name(srcFormat));
1227 return AVERROR(EINVAL);
1229 if (!sws_isSupportedOutput(dstFormat)) {
1230 av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",
1231 av_get_pix_fmt_name(dstFormat));
1232 return AVERROR(EINVAL);
1235 av_assert2(desc_src && desc_dst);
1237 i = flags & (SWS_POINT |
1249 /* provide a default scaler if not set by caller */
1251 if (dstW < srcW && dstH < srcH)
1252 flags |= SWS_BICUBIC;
1253 else if (dstW > srcW && dstH > srcH)
1254 flags |= SWS_BICUBIC;
1256 flags |= SWS_BICUBIC;
1258 } else if (i & (i - 1)) {
1259 av_log(c, AV_LOG_ERROR,
1260 "Exactly one scaler algorithm must be chosen, got %X\n", i);
1261 return AVERROR(EINVAL);
1264 if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {
1265 /* FIXME check if these are enough and try to lower them after
1266 * fixing the relevant parts of the code */
1267 av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",
1268 srcW, srcH, dstW, dstH);
1269 return AVERROR(EINVAL);
1271 if (flags & SWS_FAST_BILINEAR) {
1272 if (srcW < 8 || dstW < 8) {
1273 flags ^= SWS_FAST_BILINEAR | SWS_BILINEAR;
1279 dstFilter = &dummyFilter;
1281 srcFilter = &dummyFilter;
1283 c->lumXInc = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
1284 c->lumYInc = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;
1285 c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
1286 c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
1287 c->vRounder = 4 * 0x0001000100010001ULL;
1289 usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||
1290 (srcFilter->chrV && srcFilter->chrV->length > 1) ||
1291 (dstFilter->lumV && dstFilter->lumV->length > 1) ||
1292 (dstFilter->chrV && dstFilter->chrV->length > 1);
1293 usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||
1294 (srcFilter->chrH && srcFilter->chrH->length > 1) ||
1295 (dstFilter->lumH && dstFilter->lumH->length > 1) ||
1296 (dstFilter->chrH && dstFilter->chrH->length > 1);
1298 av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);
1299 av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);
1301 if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
1303 av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
1304 flags |= SWS_FULL_CHR_H_INT;
1308 if ( c->chrSrcHSubSample == 0
1309 && c->chrSrcVSubSample == 0
1310 && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER
1311 && !(c->flags & SWS_FAST_BILINEAR)
1313 av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");
1314 flags |= SWS_FULL_CHR_H_INT;
1319 if (c->dither == SWS_DITHER_AUTO) {
1320 if (flags & SWS_ERROR_DIFFUSION)
1321 c->dither = SWS_DITHER_ED;
1324 if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
1325 dstFormat == AV_PIX_FMT_RGB4_BYTE ||
1326 dstFormat == AV_PIX_FMT_BGR8 ||
1327 dstFormat == AV_PIX_FMT_RGB8) {
1328 if (c->dither == SWS_DITHER_AUTO)
1329 c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;
1330 if (!(flags & SWS_FULL_CHR_H_INT)) {
1331 if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {
1332 av_log(c, AV_LOG_DEBUG,
1333 "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",
1334 av_get_pix_fmt_name(dstFormat));
1335 flags |= SWS_FULL_CHR_H_INT;
1339 if (flags & SWS_FULL_CHR_H_INT) {
1340 if (c->dither == SWS_DITHER_BAYER) {
1341 av_log(c, AV_LOG_DEBUG,
1342 "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
1343 av_get_pix_fmt_name(dstFormat));
1344 c->dither = SWS_DITHER_ED;
1348 if (isPlanarRGB(dstFormat)) {
1349 if (!(flags & SWS_FULL_CHR_H_INT)) {
1350 av_log(c, AV_LOG_DEBUG,
1351 "%s output is not supported with half chroma resolution, switching to full\n",
1352 av_get_pix_fmt_name(dstFormat));
1353 flags |= SWS_FULL_CHR_H_INT;
1358 /* reuse chroma for 2 pixels RGB/BGR unless user wants full
1359 * chroma interpolation */
1360 if (flags & SWS_FULL_CHR_H_INT &&
1361 isAnyRGB(dstFormat) &&
1362 !isPlanarRGB(dstFormat) &&
1363 dstFormat != AV_PIX_FMT_RGBA64LE &&
1364 dstFormat != AV_PIX_FMT_RGBA64BE &&
1365 dstFormat != AV_PIX_FMT_BGRA64LE &&
1366 dstFormat != AV_PIX_FMT_BGRA64BE &&
1367 dstFormat != AV_PIX_FMT_RGB48LE &&
1368 dstFormat != AV_PIX_FMT_RGB48BE &&
1369 dstFormat != AV_PIX_FMT_BGR48LE &&
1370 dstFormat != AV_PIX_FMT_BGR48BE &&
1371 dstFormat != AV_PIX_FMT_RGBA &&
1372 dstFormat != AV_PIX_FMT_ARGB &&
1373 dstFormat != AV_PIX_FMT_BGRA &&
1374 dstFormat != AV_PIX_FMT_ABGR &&
1375 dstFormat != AV_PIX_FMT_RGB24 &&
1376 dstFormat != AV_PIX_FMT_BGR24 &&
1377 dstFormat != AV_PIX_FMT_BGR4_BYTE &&
1378 dstFormat != AV_PIX_FMT_RGB4_BYTE &&
1379 dstFormat != AV_PIX_FMT_BGR8 &&
1380 dstFormat != AV_PIX_FMT_RGB8
1382 av_log(c, AV_LOG_WARNING,
1383 "full chroma interpolation for destination format '%s' not yet implemented\n",
1384 av_get_pix_fmt_name(dstFormat));
1385 flags &= ~SWS_FULL_CHR_H_INT;
1388 if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))
1389 c->chrDstHSubSample = 1;
1391 // drop some chroma lines if the user wants it
1392 c->vChrDrop = (flags & SWS_SRC_V_CHR_DROP_MASK) >>
1393 SWS_SRC_V_CHR_DROP_SHIFT;
1394 c->chrSrcVSubSample += c->vChrDrop;
1396 /* drop every other pixel for chroma calculation unless user
1397 * wants full chroma */
1398 if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP) &&
1399 srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
1400 srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
1401 srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&
1402 srcFormat != AV_PIX_FMT_GBRP9BE && srcFormat != AV_PIX_FMT_GBRP9LE &&
1403 srcFormat != AV_PIX_FMT_GBRP10BE && srcFormat != AV_PIX_FMT_GBRP10LE &&
1404 srcFormat != AV_PIX_FMT_GBRAP10BE && srcFormat != AV_PIX_FMT_GBRAP10LE &&
1405 srcFormat != AV_PIX_FMT_GBRP12BE && srcFormat != AV_PIX_FMT_GBRP12LE &&
1406 srcFormat != AV_PIX_FMT_GBRAP12BE && srcFormat != AV_PIX_FMT_GBRAP12LE &&
1407 srcFormat != AV_PIX_FMT_GBRP14BE && srcFormat != AV_PIX_FMT_GBRP14LE &&
1408 srcFormat != AV_PIX_FMT_GBRP16BE && srcFormat != AV_PIX_FMT_GBRP16LE &&
1409 srcFormat != AV_PIX_FMT_GBRAP16BE && srcFormat != AV_PIX_FMT_GBRAP16LE &&
1410 srcFormat != AV_PIX_FMT_GBRPF32BE && srcFormat != AV_PIX_FMT_GBRPF32LE &&
1411 srcFormat != AV_PIX_FMT_GBRAPF32BE && srcFormat != AV_PIX_FMT_GBRAPF32LE &&
1412 ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
1413 (flags & SWS_FAST_BILINEAR)))
1414 c->chrSrcHSubSample = 1;
1416 // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.
1417 c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);
1418 c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);
1419 c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);
1420 c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);
1422 if (!FF_ALLOCZ_TYPED_ARRAY(c->formatConvBuffer, FFALIGN(srcW * 2 + 78, 16) * 2))
1425 c->srcBpc = desc_src->comp[0].depth;
1428 c->dstBpc = desc_dst->comp[0].depth;
1431 if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)
1433 if (c->dstBpc == 16)
1436 if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
1437 c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&
1438 c->chrDstW >= c->chrSrcW &&
1440 if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0
1442 && (flags & SWS_FAST_BILINEAR)) {
1443 if (flags & SWS_PRINT_INFO)
1444 av_log(c, AV_LOG_INFO,
1445 "output width is not a multiple of 32 -> no MMXEXT scaler\n");
1447 if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))
1448 c->canMMXEXTBeUsed = 0;
1450 c->canMMXEXTBeUsed = 0;
1452 c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
1453 c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;
1455 /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src
1456 * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do
1458 * n-2 is the last chrominance sample available.
1459 * This is not perfect, but no one should notice the difference, the more
1460 * correct variant would be like the vertical one, but that would require
1461 * some special code for the first and last pixel */
1462 if (flags & SWS_FAST_BILINEAR) {
1463 if (c->canMMXEXTBeUsed) {
1467 // we don't use the x86 asm scaler if MMX is available
1468 else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {
1469 c->lumXInc = ((int64_t)(srcW - 2) << 16) / (dstW - 2) - 20;
1470 c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;
1474 // hardcoded for now
1475 c->gamma_value = 2.2;
1476 tmpFmt = AV_PIX_FMT_RGBA64LE;
1479 if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {
1481 c->cascaded_context[0] = NULL;
1483 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1484 srcW, srcH, tmpFmt, 64);
1488 c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
1490 flags, NULL, NULL, c->param);
1491 if (!c->cascaded_context[0]) {
1492 return AVERROR(ENOMEM);
1495 c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,
1497 flags, srcFilter, dstFilter, c->param);
1499 if (!c->cascaded_context[1])
1500 return AVERROR(ENOMEM);
1502 c2 = c->cascaded_context[1];
1503 c2->is_internal_gamma = 1;
1504 c2->gamma = alloc_gamma_tbl( c->gamma_value);
1505 c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);
1506 if (!c2->gamma || !c2->inv_gamma)
1507 return AVERROR(ENOMEM);
1509 // is_internal_flag is set after creating the context
1510 // to properly create the gamma convert FilterDescriptor
1511 // we have to re-initialize it
1512 ff_free_filters(c2);
1513 if ((ret = ff_init_filters(c2)) < 0) {
1514 sws_freeContext(c2);
1515 c->cascaded_context[1] = NULL;
1519 c->cascaded_context[2] = NULL;
1520 if (dstFormat != tmpFmt) {
1521 ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,
1522 dstW, dstH, tmpFmt, 64);
1526 c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,
1527 dstW, dstH, dstFormat,
1528 flags, NULL, NULL, c->param);
1529 if (!c->cascaded_context[2])
1530 return AVERROR(ENOMEM);
1535 if (isBayer(srcFormat)) {
1537 (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P &&
1538 dstFormat != AV_PIX_FMT_RGB48)) {
1539 enum AVPixelFormat tmpFormat = isBayer16BPS(srcFormat) ? AV_PIX_FMT_RGB48 : AV_PIX_FMT_RGB24;
1541 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1542 srcW, srcH, tmpFormat, 64);
1546 c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
1547 srcW, srcH, tmpFormat,
1548 flags, srcFilter, NULL, c->param);
1549 if (!c->cascaded_context[0])
1550 return AVERROR(ENOMEM);
1552 c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,
1553 dstW, dstH, dstFormat,
1554 flags, NULL, dstFilter, c->param);
1555 if (!c->cascaded_context[1])
1556 return AVERROR(ENOMEM);
1561 if (unscaled && c->srcBpc == 8 && dstFormat == AV_PIX_FMT_GRAYF32){
1562 for (i = 0; i < 256; ++i){
1563 c->uint2float_lut[i] = (float)i * float_mult;
1567 // float will be converted to uint16_t
1568 if ((srcFormat == AV_PIX_FMT_GRAYF32BE || srcFormat == AV_PIX_FMT_GRAYF32LE) &&
1569 (!unscaled || unscaled && dstFormat != srcFormat && (srcFormat != AV_PIX_FMT_GRAYF32 ||
1570 dstFormat != AV_PIX_FMT_GRAY8))){
1574 if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {
1575 enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);
1577 if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE) {
1579 dstFormat != tmpFormat ||
1580 usesHFilter || usesVFilter ||
1581 c->srcRange != c->dstRange
1583 c->cascaded_mainindex = 1;
1584 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1585 srcW, srcH, tmpFormat, 64);
1589 c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,
1590 srcW, srcH, tmpFormat,
1592 if (!c->cascaded_context[0])
1593 return AVERROR(EINVAL);
1594 c->cascaded_context[0]->alphablend = c->alphablend;
1595 ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
1599 c->cascaded_context[1] = sws_alloc_set_opts(srcW, srcH, tmpFormat,
1600 dstW, dstH, dstFormat,
1602 if (!c->cascaded_context[1])
1603 return AVERROR(EINVAL);
1605 c->cascaded_context[1]->srcRange = c->srcRange;
1606 c->cascaded_context[1]->dstRange = c->dstRange;
1607 ret = sws_init_context(c->cascaded_context[1], srcFilter , dstFilter);
1616 #if HAVE_MMAP && HAVE_MPROTECT && defined(MAP_ANONYMOUS)
1622 /* precalculate horizontal scaler filter coefficients */
1624 #if HAVE_MMXEXT_INLINE
1625 // can't downscale !!!
1626 if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {
1627 c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,
1629 c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,
1630 NULL, NULL, NULL, 4);
1633 c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
1634 PROT_READ | PROT_WRITE,
1635 MAP_PRIVATE | MAP_ANONYMOUS,
1637 c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
1638 PROT_READ | PROT_WRITE,
1639 MAP_PRIVATE | MAP_ANONYMOUS,
1641 #elif HAVE_VIRTUALALLOC
1642 c->lumMmxextFilterCode = VirtualAlloc(NULL,
1643 c->lumMmxextFilterCodeSize,
1645 PAGE_EXECUTE_READWRITE);
1646 c->chrMmxextFilterCode = VirtualAlloc(NULL,
1647 c->chrMmxextFilterCodeSize,
1649 PAGE_EXECUTE_READWRITE);
1651 c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
1652 c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);
1655 #ifdef MAP_ANONYMOUS
1656 if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)
1658 if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)
1661 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");
1662 return AVERROR(ENOMEM);
1665 if (!FF_ALLOCZ_TYPED_ARRAY(c->hLumFilter, dstW / 8 + 8) ||
1666 !FF_ALLOCZ_TYPED_ARRAY(c->hChrFilter, c->chrDstW / 4 + 8) ||
1667 !FF_ALLOCZ_TYPED_ARRAY(c->hLumFilterPos, dstW / 2 / 8 + 8) ||
1668 !FF_ALLOCZ_TYPED_ARRAY(c->hChrFilterPos, c->chrDstW / 2 / 4 + 8))
1671 ff_init_hscaler_mmxext( dstW, c->lumXInc, c->lumMmxextFilterCode,
1672 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
1673 ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
1674 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
1677 if ( mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1
1678 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {
1679 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");
1680 ret = AVERROR(EINVAL);
1685 #endif /* HAVE_MMXEXT_INLINE */
1687 const int filterAlign = X86_MMX(cpu_flags) ? 4 :
1688 PPC_ALTIVEC(cpu_flags) ? 8 :
1689 have_neon(cpu_flags) ? 8 : 1;
1691 if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,
1692 &c->hLumFilterSize, c->lumXInc,
1693 srcW, dstW, filterAlign, 1 << 14,
1694 (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1695 cpu_flags, srcFilter->lumH, dstFilter->lumH,
1697 get_local_pos(c, 0, 0, 0),
1698 get_local_pos(c, 0, 0, 0))) < 0)
1700 if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,
1701 &c->hChrFilterSize, c->chrXInc,
1702 c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
1703 (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1704 cpu_flags, srcFilter->chrH, dstFilter->chrH,
1706 get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
1707 get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)
1710 } // initialize horizontal stuff
1712 /* precalculate vertical scaler filter coefficients */
1714 const int filterAlign = X86_MMX(cpu_flags) ? 2 :
1715 PPC_ALTIVEC(cpu_flags) ? 8 :
1716 have_neon(cpu_flags) ? 2 : 1;
1718 if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
1719 c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
1720 (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1721 cpu_flags, srcFilter->lumV, dstFilter->lumV,
1723 get_local_pos(c, 0, 0, 1),
1724 get_local_pos(c, 0, 0, 1))) < 0)
1726 if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
1727 c->chrYInc, c->chrSrcH, c->chrDstH,
1728 filterAlign, (1 << 12),
1729 (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1730 cpu_flags, srcFilter->chrV, dstFilter->chrV,
1732 get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
1733 get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)
1738 if (!FF_ALLOC_TYPED_ARRAY(c->vYCoeffsBank, c->vLumFilterSize * c->dstH) ||
1739 !FF_ALLOC_TYPED_ARRAY(c->vCCoeffsBank, c->vChrFilterSize * c->chrDstH))
1742 for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {
1744 short *p = (short *)&c->vYCoeffsBank[i];
1745 for (j = 0; j < 8; j++)
1746 p[j] = c->vLumFilter[i];
1749 for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {
1751 short *p = (short *)&c->vCCoeffsBank[i];
1752 for (j = 0; j < 8; j++)
1753 p[j] = c->vChrFilter[i];
1758 for (i = 0; i < 4; i++)
1759 if (!FF_ALLOCZ_TYPED_ARRAY(c->dither_error[i], c->dstW + 2))
1762 c->needAlpha = (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) ? 1 : 0;
1764 // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)
1765 c->uv_off = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);
1766 c->uv_offx2 = dst_stride + 16;
1768 av_assert0(c->chrDstH <= dstH);
1770 if (flags & SWS_PRINT_INFO) {
1771 const char *scaler = NULL, *cpucaps;
1773 for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
1774 if (flags & scale_algorithms[i].flag) {
1775 scaler = scale_algorithms[i].description;
1780 scaler = "ehh flags invalid?!";
1781 av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",
1783 av_get_pix_fmt_name(srcFormat),
1785 dstFormat == AV_PIX_FMT_BGR555 || dstFormat == AV_PIX_FMT_BGR565 ||
1786 dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
1787 dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?
1792 av_get_pix_fmt_name(dstFormat));
1794 if (INLINE_MMXEXT(cpu_flags))
1796 else if (INLINE_AMD3DNOW(cpu_flags))
1798 else if (INLINE_MMX(cpu_flags))
1800 else if (PPC_ALTIVEC(cpu_flags))
1801 cpucaps = "AltiVec";
1805 av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);
1807 av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);
1808 av_log(c, AV_LOG_DEBUG,
1809 "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1810 c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);
1811 av_log(c, AV_LOG_DEBUG,
1812 "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1813 c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,
1814 c->chrXInc, c->chrYInc);
1817 /* alpha blend special case, note this has been split via cascaded contexts if its scaled */
1818 if (unscaled && !usesHFilter && !usesVFilter &&
1819 c->alphablend != SWS_ALPHA_BLEND_NONE &&
1820 isALPHA(srcFormat) &&
1821 (c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&
1822 alphaless_fmt(srcFormat) == dstFormat
1824 c->swscale = ff_sws_alphablendaway;
1826 if (flags & SWS_PRINT_INFO)
1827 av_log(c, AV_LOG_INFO,
1828 "using alpha blendaway %s -> %s special converter\n",
1829 av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1833 /* unscaled special cases */
1834 if (unscaled && !usesHFilter && !usesVFilter &&
1835 (c->srcRange == c->dstRange || isAnyRGB(dstFormat) ||
1836 isFloat(srcFormat) || isFloat(dstFormat))){
1837 ff_get_unscaled_swscale(c);
1840 if (flags & SWS_PRINT_INFO)
1841 av_log(c, AV_LOG_INFO,
1842 "using unscaled %s -> %s special converter\n",
1843 av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1848 c->swscale = ff_getSwsFunc(c);
1849 return ff_init_filters(c);
1851 ret = AVERROR(ENOMEM);
1852 fail: // FIXME replace things by appropriate error codes
1853 if (ret == RETCODE_USE_CASCADE) {
1854 int tmpW = sqrt(srcW * (int64_t)dstW);
1855 int tmpH = sqrt(srcH * (int64_t)dstH);
1856 enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;
1858 if (isALPHA(srcFormat))
1859 tmpFormat = AV_PIX_FMT_YUVA420P;
1861 if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)
1862 return AVERROR(EINVAL);
1864 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1865 tmpW, tmpH, tmpFormat, 64);
1869 c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
1870 tmpW, tmpH, tmpFormat,
1871 flags, srcFilter, NULL, c->param);
1872 if (!c->cascaded_context[0])
1873 return AVERROR(ENOMEM);
1875 c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,
1876 dstW, dstH, dstFormat,
1877 flags, NULL, dstFilter, c->param);
1878 if (!c->cascaded_context[1])
1879 return AVERROR(ENOMEM);
1885 SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,
1886 int dstW, int dstH, enum AVPixelFormat dstFormat,
1887 int flags, const double *param)
1891 if (!(c = sws_alloc_context()))
1899 c->srcFormat = srcFormat;
1900 c->dstFormat = dstFormat;
1903 c->param[0] = param[0];
1904 c->param[1] = param[1];
1910 SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
1911 int dstW, int dstH, enum AVPixelFormat dstFormat,
1912 int flags, SwsFilter *srcFilter,
1913 SwsFilter *dstFilter, const double *param)
1917 c = sws_alloc_set_opts(srcW, srcH, srcFormat,
1918 dstW, dstH, dstFormat,
1923 if (sws_init_context(c, srcFilter, dstFilter) < 0) {
1931 static int isnan_vec(SwsVector *a)
1934 for (i=0; i<a->length; i++)
1935 if (isnan(a->coeff[i]))
1940 static void makenan_vec(SwsVector *a)
1943 for (i=0; i<a->length; i++)
1947 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
1948 float lumaSharpen, float chromaSharpen,
1949 float chromaHShift, float chromaVShift,
1952 SwsFilter *filter = av_malloc(sizeof(SwsFilter));
1956 if (lumaGBlur != 0.0) {
1957 filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
1958 filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);
1960 filter->lumH = sws_getIdentityVec();
1961 filter->lumV = sws_getIdentityVec();
1964 if (chromaGBlur != 0.0) {
1965 filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
1966 filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);
1968 filter->chrH = sws_getIdentityVec();
1969 filter->chrV = sws_getIdentityVec();
1972 if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)
1975 if (chromaSharpen != 0.0) {
1976 SwsVector *id = sws_getIdentityVec();
1979 sws_scaleVec(filter->chrH, -chromaSharpen);
1980 sws_scaleVec(filter->chrV, -chromaSharpen);
1981 sws_addVec(filter->chrH, id);
1982 sws_addVec(filter->chrV, id);
1986 if (lumaSharpen != 0.0) {
1987 SwsVector *id = sws_getIdentityVec();
1990 sws_scaleVec(filter->lumH, -lumaSharpen);
1991 sws_scaleVec(filter->lumV, -lumaSharpen);
1992 sws_addVec(filter->lumH, id);
1993 sws_addVec(filter->lumV, id);
1997 if (chromaHShift != 0.0)
1998 sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));
2000 if (chromaVShift != 0.0)
2001 sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));
2003 sws_normalizeVec(filter->chrH, 1.0);
2004 sws_normalizeVec(filter->chrV, 1.0);
2005 sws_normalizeVec(filter->lumH, 1.0);
2006 sws_normalizeVec(filter->lumV, 1.0);
2008 if (isnan_vec(filter->chrH) ||
2009 isnan_vec(filter->chrV) ||
2010 isnan_vec(filter->lumH) ||
2011 isnan_vec(filter->lumV))
2015 sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
2017 sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
2022 sws_freeVec(filter->lumH);
2023 sws_freeVec(filter->lumV);
2024 sws_freeVec(filter->chrH);
2025 sws_freeVec(filter->chrV);
2030 SwsVector *sws_allocVec(int length)
2034 if(length <= 0 || length > INT_MAX/ sizeof(double))
2037 vec = av_malloc(sizeof(SwsVector));
2040 vec->length = length;
2041 vec->coeff = av_malloc(sizeof(double) * length);
2047 SwsVector *sws_getGaussianVec(double variance, double quality)
2049 const int length = (int)(variance * quality + 0.5) | 1;
2051 double middle = (length - 1) * 0.5;
2054 if(variance < 0 || quality < 0)
2057 vec = sws_allocVec(length);
2062 for (i = 0; i < length; i++) {
2063 double dist = i - middle;
2064 vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
2065 sqrt(2 * variance * M_PI);
2068 sws_normalizeVec(vec, 1.0);
2074 * Allocate and return a vector with length coefficients, all
2075 * with the same value c.
2078 SwsVector *sws_getConstVec(double c, int length)
2081 SwsVector *vec = sws_allocVec(length);
2086 for (i = 0; i < length; i++)
2093 * Allocate and return a vector with just one coefficient, with
2097 SwsVector *sws_getIdentityVec(void)
2099 return sws_getConstVec(1.0, 1);
2102 static double sws_dcVec(SwsVector *a)
2107 for (i = 0; i < a->length; i++)
2113 void sws_scaleVec(SwsVector *a, double scalar)
2117 for (i = 0; i < a->length; i++)
2118 a->coeff[i] *= scalar;
2121 void sws_normalizeVec(SwsVector *a, double height)
2123 sws_scaleVec(a, height / sws_dcVec(a));
2126 static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
2128 int length = FFMAX(a->length, b->length);
2130 SwsVector *vec = sws_getConstVec(0.0, length);
2135 for (i = 0; i < a->length; i++)
2136 vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
2137 for (i = 0; i < b->length; i++)
2138 vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];
2143 /* shift left / or right if "shift" is negative */
2144 static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
2146 int length = a->length + FFABS(shift) * 2;
2148 SwsVector *vec = sws_getConstVec(0.0, length);
2153 for (i = 0; i < a->length; i++) {
2154 vec->coeff[i + (length - 1) / 2 -
2155 (a->length - 1) / 2 - shift] = a->coeff[i];
2162 void sws_shiftVec(SwsVector *a, int shift)
2164 SwsVector *shifted = sws_getShiftedVec(a, shift);
2170 a->coeff = shifted->coeff;
2171 a->length = shifted->length;
2176 void sws_addVec(SwsVector *a, SwsVector *b)
2178 SwsVector *sum = sws_sumVec(a, b);
2184 a->coeff = sum->coeff;
2185 a->length = sum->length;
2190 * Print with av_log() a textual representation of the vector a
2191 * if log_level <= av_log_level.
2194 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
2201 for (i = 0; i < a->length; i++)
2202 if (a->coeff[i] > max)
2205 for (i = 0; i < a->length; i++)
2206 if (a->coeff[i] < min)
2211 for (i = 0; i < a->length; i++) {
2212 int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);
2213 av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
2215 av_log(log_ctx, log_level, " ");
2216 av_log(log_ctx, log_level, "|\n");
2220 void sws_freeVec(SwsVector *a)
2224 av_freep(&a->coeff);
2229 void sws_freeFilter(SwsFilter *filter)
2234 sws_freeVec(filter->lumH);
2235 sws_freeVec(filter->lumV);
2236 sws_freeVec(filter->chrH);
2237 sws_freeVec(filter->chrV);
2241 void sws_freeContext(SwsContext *c)
2247 for (i = 0; i < 4; i++)
2248 av_freep(&c->dither_error[i]);
2250 av_freep(&c->vLumFilter);
2251 av_freep(&c->vChrFilter);
2252 av_freep(&c->hLumFilter);
2253 av_freep(&c->hChrFilter);
2255 av_freep(&c->vYCoeffsBank);
2256 av_freep(&c->vCCoeffsBank);
2259 av_freep(&c->vLumFilterPos);
2260 av_freep(&c->vChrFilterPos);
2261 av_freep(&c->hLumFilterPos);
2262 av_freep(&c->hChrFilterPos);
2266 if (c->lumMmxextFilterCode)
2267 munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
2268 if (c->chrMmxextFilterCode)
2269 munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);
2270 #elif HAVE_VIRTUALALLOC
2271 if (c->lumMmxextFilterCode)
2272 VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
2273 if (c->chrMmxextFilterCode)
2274 VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);
2276 av_free(c->lumMmxextFilterCode);
2277 av_free(c->chrMmxextFilterCode);
2279 c->lumMmxextFilterCode = NULL;
2280 c->chrMmxextFilterCode = NULL;
2281 #endif /* HAVE_MMX_INLINE */
2283 av_freep(&c->yuvTable);
2284 av_freep(&c->formatConvBuffer);
2286 sws_freeContext(c->cascaded_context[0]);
2287 sws_freeContext(c->cascaded_context[1]);
2288 sws_freeContext(c->cascaded_context[2]);
2289 memset(c->cascaded_context, 0, sizeof(c->cascaded_context));
2290 av_freep(&c->cascaded_tmp[0]);
2291 av_freep(&c->cascaded1_tmp[0]);
2293 av_freep(&c->gamma);
2294 av_freep(&c->inv_gamma);
2301 struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,
2302 int srcH, enum AVPixelFormat srcFormat,
2304 enum AVPixelFormat dstFormat, int flags,
2305 SwsFilter *srcFilter,
2306 SwsFilter *dstFilter,
2307 const double *param)
2309 static const double default_param[2] = { SWS_PARAM_DEFAULT,
2310 SWS_PARAM_DEFAULT };
2311 int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,
2312 src_v_chr_pos = -513, dst_v_chr_pos = -513;
2315 param = default_param;
2318 (context->srcW != srcW ||
2319 context->srcH != srcH ||
2320 context->srcFormat != srcFormat ||
2321 context->dstW != dstW ||
2322 context->dstH != dstH ||
2323 context->dstFormat != dstFormat ||
2324 context->flags != flags ||
2325 context->param[0] != param[0] ||
2326 context->param[1] != param[1])) {
2328 av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);
2329 av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);
2330 av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);
2331 av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);
2332 sws_freeContext(context);
2337 if (!(context = sws_alloc_context()))
2339 context->srcW = srcW;
2340 context->srcH = srcH;
2341 context->srcFormat = srcFormat;
2342 context->dstW = dstW;
2343 context->dstH = dstH;
2344 context->dstFormat = dstFormat;
2345 context->flags = flags;
2346 context->param[0] = param[0];
2347 context->param[1] = param[1];
2349 av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);
2350 av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);
2351 av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);
2352 av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);
2354 if (sws_init_context(context, srcFilter, dstFilter) < 0) {
2355 sws_freeContext(context);