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"
57 // We have to implement deprecated functions until they are removed, this is the
58 // simplest way to prevent warnings
59 #undef attribute_deprecated
60 #define attribute_deprecated
64 #include "swscale_internal.h"
66 #if !FF_API_SWS_VECTOR
67 static SwsVector *sws_getIdentityVec(void);
68 static void sws_addVec(SwsVector *a, SwsVector *b);
69 static void sws_shiftVec(SwsVector *a, int shift);
70 static void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
73 static void handle_formats(SwsContext *c);
75 unsigned swscale_version(void)
77 av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);
78 return LIBSWSCALE_VERSION_INT;
81 const char *swscale_configuration(void)
83 return FFMPEG_CONFIGURATION;
86 const char *swscale_license(void)
88 #define LICENSE_PREFIX "libswscale license: "
89 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
92 typedef struct FormatEntry {
93 uint8_t is_supported_in :1;
94 uint8_t is_supported_out :1;
95 uint8_t is_supported_endianness :1;
98 static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
99 [AV_PIX_FMT_YUV420P] = { 1, 1 },
100 [AV_PIX_FMT_YUYV422] = { 1, 1 },
101 [AV_PIX_FMT_RGB24] = { 1, 1 },
102 [AV_PIX_FMT_BGR24] = { 1, 1 },
103 [AV_PIX_FMT_YUV422P] = { 1, 1 },
104 [AV_PIX_FMT_YUV444P] = { 1, 1 },
105 [AV_PIX_FMT_YUV410P] = { 1, 1 },
106 [AV_PIX_FMT_YUV411P] = { 1, 1 },
107 [AV_PIX_FMT_GRAY8] = { 1, 1 },
108 [AV_PIX_FMT_MONOWHITE] = { 1, 1 },
109 [AV_PIX_FMT_MONOBLACK] = { 1, 1 },
110 [AV_PIX_FMT_PAL8] = { 1, 0 },
111 [AV_PIX_FMT_YUVJ420P] = { 1, 1 },
112 [AV_PIX_FMT_YUVJ411P] = { 1, 1 },
113 [AV_PIX_FMT_YUVJ422P] = { 1, 1 },
114 [AV_PIX_FMT_YUVJ444P] = { 1, 1 },
115 [AV_PIX_FMT_YVYU422] = { 1, 1 },
116 [AV_PIX_FMT_UYVY422] = { 1, 1 },
117 [AV_PIX_FMT_UYYVYY411] = { 0, 0 },
118 [AV_PIX_FMT_BGR8] = { 1, 1 },
119 [AV_PIX_FMT_BGR4] = { 0, 1 },
120 [AV_PIX_FMT_BGR4_BYTE] = { 1, 1 },
121 [AV_PIX_FMT_RGB8] = { 1, 1 },
122 [AV_PIX_FMT_RGB4] = { 0, 1 },
123 [AV_PIX_FMT_RGB4_BYTE] = { 1, 1 },
124 [AV_PIX_FMT_NV12] = { 1, 1 },
125 [AV_PIX_FMT_NV21] = { 1, 1 },
126 [AV_PIX_FMT_ARGB] = { 1, 1 },
127 [AV_PIX_FMT_RGBA] = { 1, 1 },
128 [AV_PIX_FMT_ABGR] = { 1, 1 },
129 [AV_PIX_FMT_BGRA] = { 1, 1 },
130 [AV_PIX_FMT_0RGB] = { 1, 1 },
131 [AV_PIX_FMT_RGB0] = { 1, 1 },
132 [AV_PIX_FMT_0BGR] = { 1, 1 },
133 [AV_PIX_FMT_BGR0] = { 1, 1 },
134 [AV_PIX_FMT_GRAY10BE] = { 1, 1 },
135 [AV_PIX_FMT_GRAY10LE] = { 1, 1 },
136 [AV_PIX_FMT_GRAY12BE] = { 1, 1 },
137 [AV_PIX_FMT_GRAY12LE] = { 1, 1 },
138 [AV_PIX_FMT_GRAY16BE] = { 1, 1 },
139 [AV_PIX_FMT_GRAY16LE] = { 1, 1 },
140 [AV_PIX_FMT_YUV440P] = { 1, 1 },
141 [AV_PIX_FMT_YUVJ440P] = { 1, 1 },
142 [AV_PIX_FMT_YUV440P10LE] = { 1, 1 },
143 [AV_PIX_FMT_YUV440P10BE] = { 1, 1 },
144 [AV_PIX_FMT_YUV440P12LE] = { 1, 1 },
145 [AV_PIX_FMT_YUV440P12BE] = { 1, 1 },
146 [AV_PIX_FMT_YUVA420P] = { 1, 1 },
147 [AV_PIX_FMT_YUVA422P] = { 1, 1 },
148 [AV_PIX_FMT_YUVA444P] = { 1, 1 },
149 [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
150 [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
151 [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
152 [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
153 [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
154 [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
155 [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
156 [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
157 [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
158 [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
159 [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
160 [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
161 [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
162 [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
163 [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
164 [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
165 [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
166 [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },
167 [AV_PIX_FMT_RGB48BE] = { 1, 1 },
168 [AV_PIX_FMT_RGB48LE] = { 1, 1 },
169 [AV_PIX_FMT_RGBA64BE] = { 1, 1, 1 },
170 [AV_PIX_FMT_RGBA64LE] = { 1, 1, 1 },
171 [AV_PIX_FMT_RGB565BE] = { 1, 1 },
172 [AV_PIX_FMT_RGB565LE] = { 1, 1 },
173 [AV_PIX_FMT_RGB555BE] = { 1, 1 },
174 [AV_PIX_FMT_RGB555LE] = { 1, 1 },
175 [AV_PIX_FMT_BGR565BE] = { 1, 1 },
176 [AV_PIX_FMT_BGR565LE] = { 1, 1 },
177 [AV_PIX_FMT_BGR555BE] = { 1, 1 },
178 [AV_PIX_FMT_BGR555LE] = { 1, 1 },
179 [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
180 [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
181 [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
182 [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
183 [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
184 [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
185 [AV_PIX_FMT_RGB444LE] = { 1, 1 },
186 [AV_PIX_FMT_RGB444BE] = { 1, 1 },
187 [AV_PIX_FMT_BGR444LE] = { 1, 1 },
188 [AV_PIX_FMT_BGR444BE] = { 1, 1 },
189 [AV_PIX_FMT_YA8] = { 1, 1 },
190 [AV_PIX_FMT_YA16BE] = { 1, 0 },
191 [AV_PIX_FMT_YA16LE] = { 1, 0 },
192 [AV_PIX_FMT_BGR48BE] = { 1, 1 },
193 [AV_PIX_FMT_BGR48LE] = { 1, 1 },
194 [AV_PIX_FMT_BGRA64BE] = { 1, 1, 1 },
195 [AV_PIX_FMT_BGRA64LE] = { 1, 1, 1 },
196 [AV_PIX_FMT_YUV420P9BE] = { 1, 1 },
197 [AV_PIX_FMT_YUV420P9LE] = { 1, 1 },
198 [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
199 [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },
200 [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
201 [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
202 [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
203 [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },
204 [AV_PIX_FMT_YUV422P9BE] = { 1, 1 },
205 [AV_PIX_FMT_YUV422P9LE] = { 1, 1 },
206 [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
207 [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },
208 [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
209 [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
210 [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
211 [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },
212 [AV_PIX_FMT_YUV444P9BE] = { 1, 1 },
213 [AV_PIX_FMT_YUV444P9LE] = { 1, 1 },
214 [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
215 [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },
216 [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
217 [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
218 [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
219 [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },
220 [AV_PIX_FMT_GBRP] = { 1, 1 },
221 [AV_PIX_FMT_GBRP9LE] = { 1, 1 },
222 [AV_PIX_FMT_GBRP9BE] = { 1, 1 },
223 [AV_PIX_FMT_GBRP10LE] = { 1, 1 },
224 [AV_PIX_FMT_GBRP10BE] = { 1, 1 },
225 [AV_PIX_FMT_GBRAP10LE] = { 1, 1 },
226 [AV_PIX_FMT_GBRAP10BE] = { 1, 1 },
227 [AV_PIX_FMT_GBRP12LE] = { 1, 1 },
228 [AV_PIX_FMT_GBRP12BE] = { 1, 1 },
229 [AV_PIX_FMT_GBRAP12LE] = { 1, 1 },
230 [AV_PIX_FMT_GBRAP12BE] = { 1, 1 },
231 [AV_PIX_FMT_GBRP14LE] = { 1, 1 },
232 [AV_PIX_FMT_GBRP14BE] = { 1, 1 },
233 [AV_PIX_FMT_GBRP16LE] = { 1, 1 },
234 [AV_PIX_FMT_GBRP16BE] = { 1, 1 },
235 [AV_PIX_FMT_GBRAP] = { 1, 1 },
236 [AV_PIX_FMT_GBRAP16LE] = { 1, 1 },
237 [AV_PIX_FMT_GBRAP16BE] = { 1, 1 },
238 [AV_PIX_FMT_BAYER_BGGR8] = { 1, 0 },
239 [AV_PIX_FMT_BAYER_RGGB8] = { 1, 0 },
240 [AV_PIX_FMT_BAYER_GBRG8] = { 1, 0 },
241 [AV_PIX_FMT_BAYER_GRBG8] = { 1, 0 },
242 [AV_PIX_FMT_BAYER_BGGR16LE] = { 1, 0 },
243 [AV_PIX_FMT_BAYER_BGGR16BE] = { 1, 0 },
244 [AV_PIX_FMT_BAYER_RGGB16LE] = { 1, 0 },
245 [AV_PIX_FMT_BAYER_RGGB16BE] = { 1, 0 },
246 [AV_PIX_FMT_BAYER_GBRG16LE] = { 1, 0 },
247 [AV_PIX_FMT_BAYER_GBRG16BE] = { 1, 0 },
248 [AV_PIX_FMT_BAYER_GRBG16LE] = { 1, 0 },
249 [AV_PIX_FMT_BAYER_GRBG16BE] = { 1, 0 },
250 [AV_PIX_FMT_XYZ12BE] = { 1, 1, 1 },
251 [AV_PIX_FMT_XYZ12LE] = { 1, 1, 1 },
252 [AV_PIX_FMT_AYUV64LE] = { 1, 1},
253 [AV_PIX_FMT_P010LE] = { 1, 1 },
254 [AV_PIX_FMT_P010BE] = { 1, 1 },
255 [AV_PIX_FMT_P016LE] = { 1, 0 },
256 [AV_PIX_FMT_P016BE] = { 1, 0 },
259 int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
261 return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
262 format_entries[pix_fmt].is_supported_in : 0;
265 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
267 return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
268 format_entries[pix_fmt].is_supported_out : 0;
271 int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
273 return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
274 format_entries[pix_fmt].is_supported_endianness : 0;
277 static double getSplineCoeff(double a, double b, double c, double d,
281 return ((d * dist + c) * dist + b) * dist + a;
283 return getSplineCoeff(0.0,
284 b + 2.0 * c + 3.0 * d,
286 -b - 3.0 * c - 6.0 * d,
290 static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)
292 if (pos == -1 || pos <= -513) {
293 pos = (128 << chr_subsample) - 128;
295 pos += 128; // relative to ideal left edge
296 return pos >> chr_subsample;
300 int flag; ///< flag associated to the algorithm
301 const char *description; ///< human-readable description
302 int size_factor; ///< size factor used when initing the filters
305 static const ScaleAlgorithm scale_algorithms[] = {
306 { SWS_AREA, "area averaging", 1 /* downscale only, for upscale it is bilinear */ },
307 { SWS_BICUBIC, "bicubic", 4 },
308 { SWS_BICUBLIN, "luma bicubic / chroma bilinear", -1 },
309 { SWS_BILINEAR, "bilinear", 2 },
310 { SWS_FAST_BILINEAR, "fast bilinear", -1 },
311 { SWS_GAUSS, "Gaussian", 8 /* infinite ;) */ },
312 { SWS_LANCZOS, "Lanczos", -1 /* custom */ },
313 { SWS_POINT, "nearest neighbor / point", -1 },
314 { SWS_SINC, "sinc", 20 /* infinite ;) */ },
315 { SWS_SPLINE, "bicubic spline", 20 /* infinite :)*/ },
316 { SWS_X, "experimental", 8 },
319 static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
320 int *outFilterSize, int xInc, int srcW,
321 int dstW, int filterAlign, int one,
322 int flags, int cpu_flags,
323 SwsVector *srcFilter, SwsVector *dstFilter,
324 double param[2], int srcPos, int dstPos)
330 int64_t *filter = NULL;
331 int64_t *filter2 = NULL;
332 const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
335 emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
337 // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
338 FF_ALLOC_ARRAY_OR_GOTO(NULL, *filterPos, (dstW + 3), sizeof(**filterPos), fail);
340 if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
343 FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,
344 dstW, sizeof(*filter) * filterSize, fail);
346 for (i = 0; i < dstW; i++) {
347 filter[i * filterSize] = fone;
350 } else if (flags & SWS_POINT) { // lame looking point sampling mode
354 FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,
355 dstW, sizeof(*filter) * filterSize, fail);
357 xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
358 for (i = 0; i < dstW; i++) {
359 int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
361 (*filterPos)[i] = xx;
365 } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
366 (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
370 FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,
371 dstW, sizeof(*filter) * filterSize, fail);
373 xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
374 for (i = 0; i < dstW; i++) {
375 int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
378 (*filterPos)[i] = xx;
379 // bilinear upscale / linear interpolate / area averaging
380 for (j = 0; j < filterSize; j++) {
381 int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
384 filter[i * filterSize + j] = coeff;
393 for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
394 if (flags & scale_algorithms[i].flag && scale_algorithms[i].size_factor > 0) {
395 sizeFactor = scale_algorithms[i].size_factor;
399 if (flags & SWS_LANCZOS)
400 sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
401 av_assert0(sizeFactor > 0);
404 filterSize = 1 + sizeFactor; // upscale
406 filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;
408 filterSize = FFMIN(filterSize, srcW - 2);
409 filterSize = FFMAX(filterSize, 1);
411 FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,
412 dstW, sizeof(*filter) * filterSize, fail);
414 xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);
415 for (i = 0; i < dstW; i++) {
416 int xx = (xDstInSrc - (filterSize - 2) * (1LL<<16)) / (1 << 17);
418 (*filterPos)[i] = xx;
419 for (j = 0; j < filterSize; j++) {
420 int64_t d = (FFABS(((int64_t)xx * (1 << 17)) - xDstInSrc)) << 13;
426 floatd = d * (1.0 / (1 << 30));
428 if (flags & SWS_BICUBIC) {
429 int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] : 0) * (1 << 24);
430 int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);
432 if (d >= 1LL << 31) {
435 int64_t dd = (d * d) >> 30;
436 int64_t ddd = (dd * d) >> 30;
439 coeff = (12 * (1 << 24) - 9 * B - 6 * C) * ddd +
440 (-18 * (1 << 24) + 12 * B + 6 * C) * dd +
441 (6 * (1 << 24) - 2 * B) * (1 << 30);
443 coeff = (-B - 6 * C) * ddd +
444 (6 * B + 30 * C) * dd +
445 (-12 * B - 48 * C) * d +
446 (8 * B + 24 * C) * (1 << 30);
448 coeff /= (1LL<<54)/fone;
451 else if (flags & SWS_X) {
452 double p = param ? param * 0.01 : 0.3;
453 coeff = d ? sin(d * M_PI) / (d * M_PI) : 1.0;
454 coeff *= pow(2.0, -p * d * d);
457 else if (flags & SWS_X) {
458 double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
462 c = cos(floatd * M_PI);
469 coeff = (c * 0.5 + 0.5) * fone;
470 } else if (flags & SWS_AREA) {
471 int64_t d2 = d - (1 << 29);
472 if (d2 * xInc < -(1LL << (29 + 16)))
473 coeff = 1.0 * (1LL << (30 + 16));
474 else if (d2 * xInc < (1LL << (29 + 16)))
475 coeff = -d2 * xInc + (1LL << (29 + 16));
478 coeff *= fone >> (30 + 16);
479 } else if (flags & SWS_GAUSS) {
480 double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
481 coeff = exp2(-p * floatd * floatd) * fone;
482 } else if (flags & SWS_SINC) {
483 coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
484 } else if (flags & SWS_LANCZOS) {
485 double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
486 coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
487 (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
490 } else if (flags & SWS_BILINEAR) {
491 coeff = (1 << 30) - d;
495 } else if (flags & SWS_SPLINE) {
496 double p = -2.196152422706632;
497 coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
502 filter[i * filterSize + j] = coeff;
505 xDstInSrc += 2 * xInc;
509 /* apply src & dst Filter to filter -> filter2
512 av_assert0(filterSize > 0);
513 filter2Size = filterSize;
515 filter2Size += srcFilter->length - 1;
517 filter2Size += dstFilter->length - 1;
518 av_assert0(filter2Size > 0);
519 FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter2, dstW, filter2Size * sizeof(*filter2), fail);
521 for (i = 0; i < dstW; i++) {
525 for (k = 0; k < srcFilter->length; k++) {
526 for (j = 0; j < filterSize; j++)
527 filter2[i * filter2Size + k + j] +=
528 srcFilter->coeff[k] * filter[i * filterSize + j];
531 for (j = 0; j < filterSize; j++)
532 filter2[i * filter2Size + j] = filter[i * filterSize + j];
536 (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
540 /* try to reduce the filter-size (step1 find size and shift left) */
541 // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
543 for (i = dstW - 1; i >= 0; i--) {
544 int min = filter2Size;
546 int64_t cutOff = 0.0;
548 /* get rid of near zero elements on the left by shifting left */
549 for (j = 0; j < filter2Size; j++) {
551 cutOff += FFABS(filter2[i * filter2Size]);
553 if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
556 /* preserve monotonicity because the core can't handle the
557 * filter otherwise */
558 if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
561 // move filter coefficients left
562 for (k = 1; k < filter2Size; k++)
563 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
564 filter2[i * filter2Size + k - 1] = 0;
569 /* count near zeros on the right */
570 for (j = filter2Size - 1; j > 0; j--) {
571 cutOff += FFABS(filter2[i * filter2Size + j]);
573 if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
578 if (min > minFilterSize)
582 if (PPC_ALTIVEC(cpu_flags)) {
583 // we can handle the special case 4, so we don't want to go the full 8
584 if (minFilterSize < 5)
587 /* We really don't want to waste our time doing useless computation, so
588 * fall back on the scalar C code for very small filters.
589 * Vectorizing is worth it only if you have a decent-sized vector. */
590 if (minFilterSize < 3)
594 if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {
595 // special case for unscaled vertical filtering
596 if (minFilterSize == 1 && filterAlign == 2)
600 av_assert0(minFilterSize > 0);
601 filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
602 av_assert0(filterSize > 0);
603 filter = av_malloc_array(dstW, filterSize * sizeof(*filter));
606 if (filterSize >= MAX_FILTER_SIZE * 16 /
607 ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {
608 ret = RETCODE_USE_CASCADE;
611 *outFilterSize = filterSize;
613 if (flags & SWS_PRINT_INFO)
614 av_log(NULL, AV_LOG_VERBOSE,
615 "SwScaler: reducing / aligning filtersize %d -> %d\n",
616 filter2Size, filterSize);
617 /* try to reduce the filter-size (step2 reduce it) */
618 for (i = 0; i < dstW; i++) {
621 for (j = 0; j < filterSize; j++) {
622 if (j >= filter2Size)
623 filter[i * filterSize + j] = 0;
625 filter[i * filterSize + j] = filter2[i * filter2Size + j];
626 if ((flags & SWS_BITEXACT) && j >= minFilterSize)
627 filter[i * filterSize + j] = 0;
631 // FIXME try to align filterPos if possible
634 for (i = 0; i < dstW; i++) {
636 if ((*filterPos)[i] < 0) {
637 // move filter coefficients left to compensate for filterPos
638 for (j = 1; j < filterSize; j++) {
639 int left = FFMAX(j + (*filterPos)[i], 0);
640 filter[i * filterSize + left] += filter[i * filterSize + j];
641 filter[i * filterSize + j] = 0;
646 if ((*filterPos)[i] + filterSize > srcW) {
647 int shift = (*filterPos)[i] + FFMIN(filterSize - srcW, 0);
650 for (j = filterSize - 1; j >= 0; j--) {
651 if ((*filterPos)[i] + j >= srcW) {
652 acc += filter[i * filterSize + j];
653 filter[i * filterSize + j] = 0;
656 for (j = filterSize - 1; j >= 0; j--) {
658 filter[i * filterSize + j] = 0;
660 filter[i * filterSize + j] = filter[i * filterSize + j - shift];
664 (*filterPos)[i]-= shift;
665 filter[i * filterSize + srcW - 1 - (*filterPos)[i]] += acc;
667 av_assert0((*filterPos)[i] >= 0);
668 av_assert0((*filterPos)[i] < srcW);
669 if ((*filterPos)[i] + filterSize > srcW) {
670 for (j = 0; j < filterSize; j++) {
671 av_assert0((*filterPos)[i] + j < srcW || !filter[i * filterSize + j]);
676 // Note the +1 is for the MMX scaler which reads over the end
677 /* align at 16 for AltiVec (needed by hScale_altivec_real) */
678 FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,
679 (dstW + 3), *outFilterSize * sizeof(int16_t), fail);
681 /* normalize & store in outFilter */
682 for (i = 0; i < dstW; i++) {
687 for (j = 0; j < filterSize; j++) {
688 sum += filter[i * filterSize + j];
690 sum = (sum + one / 2) / one;
692 av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");
695 for (j = 0; j < *outFilterSize; j++) {
696 int64_t v = filter[i * filterSize + j] + error;
697 int intV = ROUNDED_DIV(v, sum);
698 (*outFilter)[i * (*outFilterSize) + j] = intV;
699 error = v - intV * sum;
703 (*filterPos)[dstW + 0] =
704 (*filterPos)[dstW + 1] =
705 (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
706 * read over the end */
707 for (i = 0; i < *outFilterSize; i++) {
708 int k = (dstW - 1) * (*outFilterSize) + i;
709 (*outFilter)[k + 1 * (*outFilterSize)] =
710 (*outFilter)[k + 2 * (*outFilterSize)] =
711 (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
718 av_log(NULL, ret == RETCODE_USE_CASCADE ? AV_LOG_DEBUG : AV_LOG_ERROR, "sws: initFilter failed\n");
724 static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
726 int64_t W, V, Z, Cy, Cu, Cv;
727 int64_t vr = table[0];
728 int64_t ub = table[1];
729 int64_t ug = -table[2];
730 int64_t vg = -table[3];
733 uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
735 static const int8_t map[] = {
736 BY_IDX, GY_IDX, -1 , BY_IDX, BY_IDX, GY_IDX, -1 , BY_IDX,
737 RY_IDX, -1 , GY_IDX, RY_IDX, RY_IDX, -1 , GY_IDX, RY_IDX,
738 RY_IDX, GY_IDX, -1 , RY_IDX, RY_IDX, GY_IDX, -1 , RY_IDX,
739 BY_IDX, -1 , GY_IDX, BY_IDX, BY_IDX, -1 , GY_IDX, BY_IDX,
740 BU_IDX, GU_IDX, -1 , BU_IDX, BU_IDX, GU_IDX, -1 , BU_IDX,
741 RU_IDX, -1 , GU_IDX, RU_IDX, RU_IDX, -1 , GU_IDX, RU_IDX,
742 RU_IDX, GU_IDX, -1 , RU_IDX, RU_IDX, GU_IDX, -1 , RU_IDX,
743 BU_IDX, -1 , GU_IDX, BU_IDX, BU_IDX, -1 , GU_IDX, BU_IDX,
744 BV_IDX, GV_IDX, -1 , BV_IDX, BV_IDX, GV_IDX, -1 , BV_IDX,
745 RV_IDX, -1 , GV_IDX, RV_IDX, RV_IDX, -1 , GV_IDX, RV_IDX,
746 RV_IDX, GV_IDX, -1 , RV_IDX, RV_IDX, GV_IDX, -1 , RV_IDX,
747 BV_IDX, -1 , GV_IDX, BV_IDX, BV_IDX, -1 , GV_IDX, BV_IDX,
748 RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
749 BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
750 GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 ,
751 -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX,
752 RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
753 BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
754 GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 ,
755 -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX,
756 RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
757 BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
758 GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 ,
759 -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, //23
760 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //24
761 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //25
762 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //26
763 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //27
764 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //28
765 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //29
766 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //30
767 -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //31
768 BY_IDX, GY_IDX, RY_IDX, -1 , -1 , -1 , -1 , -1 , //32
769 BU_IDX, GU_IDX, RU_IDX, -1 , -1 , -1 , -1 , -1 , //33
770 BV_IDX, GV_IDX, RV_IDX, -1 , -1 , -1 , -1 , -1 , //34
773 dstRange = 0; //FIXME range = 1 is handled elsewhere
783 W = ROUNDED_DIV(ONE*ONE*ug, ub);
784 V = ROUNDED_DIV(ONE*ONE*vg, vr);
787 Cy = ROUNDED_DIV(cy*Z, ONE);
788 Cu = ROUNDED_DIV(ub*Z, ONE);
789 Cv = ROUNDED_DIV(vr*Z, ONE);
791 c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cy);
792 c->input_rgb2yuv_table[GY_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cy);
793 c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cy);
795 c->input_rgb2yuv_table[RU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cu);
796 c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cu);
797 c->input_rgb2yuv_table[BU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W) , Cu);
799 c->input_rgb2yuv_table[RV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z) , Cv);
800 c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cv);
801 c->input_rgb2yuv_table[BV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cv);
803 if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {
804 c->input_rgb2yuv_table[BY_IDX] = ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
805 c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
806 c->input_rgb2yuv_table[BU_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
807 c->input_rgb2yuv_table[GY_IDX] = ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
808 c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
809 c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
810 c->input_rgb2yuv_table[RY_IDX] = ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
811 c->input_rgb2yuv_table[RV_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
812 c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
814 for(i=0; i<FF_ARRAY_ELEMS(map); i++)
815 AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
818 static void fill_xyztables(struct SwsContext *c)
821 double xyzgamma = XYZ_GAMMA;
822 double rgbgamma = 1.0 / RGB_GAMMA;
823 double xyzgammainv = 1.0 / XYZ_GAMMA;
824 double rgbgammainv = RGB_GAMMA;
825 static const int16_t xyz2rgb_matrix[3][4] = {
826 {13270, -6295, -2041},
828 { 228, -835, 4329} };
829 static const int16_t rgb2xyz_matrix[3][4] = {
833 static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];
835 memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
836 memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
837 c->xyzgamma = xyzgamma_tab;
838 c->rgbgamma = rgbgamma_tab;
839 c->xyzgammainv = xyzgammainv_tab;
840 c->rgbgammainv = rgbgammainv_tab;
842 if (rgbgamma_tab[4095])
845 /* set gamma vectors */
846 for (i = 0; i < 4096; i++) {
847 xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
848 rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
849 xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);
850 rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);
854 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
855 int srcRange, const int table[4], int dstRange,
856 int brightness, int contrast, int saturation)
858 const AVPixFmtDescriptor *desc_dst;
859 const AVPixFmtDescriptor *desc_src;
863 desc_dst = av_pix_fmt_desc_get(c->dstFormat);
864 desc_src = av_pix_fmt_desc_get(c->srcFormat);
866 if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
868 if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
871 if (c->srcRange != srcRange ||
872 c->dstRange != dstRange ||
873 c->brightness != brightness ||
874 c->contrast != contrast ||
875 c->saturation != saturation ||
876 memcmp(c->srcColorspaceTable, inv_table, sizeof(int) * 4) ||
877 memcmp(c->dstColorspaceTable, table, sizeof(int) * 4)
881 memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
882 memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
886 c->brightness = brightness;
887 c->contrast = contrast;
888 c->saturation = saturation;
889 c->srcRange = srcRange;
890 c->dstRange = dstRange;
892 //The srcBpc check is possibly wrong but we seem to lack a definitive reference to test this
893 //and what we have in ticket 2939 looks better with this check
894 if (need_reinit && (c->srcBpc == 8 || !isYUV(c->srcFormat)))
895 ff_sws_init_range_convert(c);
897 c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
898 c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
900 if (c->cascaded_context[c->cascaded_mainindex])
901 return sws_setColorspaceDetails(c->cascaded_context[c->cascaded_mainindex],inv_table, srcRange,table, dstRange, brightness, contrast, saturation);
906 if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat))) {
907 if (!c->cascaded_context[0] &&
908 memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&
909 c->srcW && c->srcH && c->dstW && c->dstH) {
910 enum AVPixelFormat tmp_format;
911 int tmp_width, tmp_height;
917 av_log(c, AV_LOG_VERBOSE, "YUV color matrix differs for YUV->YUV, using intermediate RGB to convert\n");
919 if (isNBPS(c->dstFormat) || is16BPS(c->dstFormat)) {
920 if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
921 tmp_format = AV_PIX_FMT_BGRA64;
923 tmp_format = AV_PIX_FMT_BGR48;
926 if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
927 tmp_format = AV_PIX_FMT_BGRA;
929 tmp_format = AV_PIX_FMT_BGR24;
933 if (srcW*srcH > dstW*dstH) {
941 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
942 tmp_width, tmp_height, tmp_format, 64);
946 c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, c->srcFormat,
947 tmp_width, tmp_height, tmp_format,
949 if (!c->cascaded_context[0])
952 c->cascaded_context[0]->alphablend = c->alphablend;
953 ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
956 //we set both src and dst depending on that the RGB side will be ignored
957 sws_setColorspaceDetails(c->cascaded_context[0], inv_table,
958 srcRange, table, dstRange,
959 brightness, contrast, saturation);
961 c->cascaded_context[1] = sws_getContext(tmp_width, tmp_height, tmp_format,
962 dstW, dstH, c->dstFormat,
963 c->flags, NULL, NULL, c->param);
964 if (!c->cascaded_context[1])
966 sws_setColorspaceDetails(c->cascaded_context[1], inv_table,
967 srcRange, table, dstRange,
968 0, 1 << 16, 1 << 16);
974 if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
975 ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
976 contrast, saturation);
980 ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,
981 contrast, saturation);
984 fill_rgb2yuv_table(c, table, dstRange);
989 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
990 int *srcRange, int **table, int *dstRange,
991 int *brightness, int *contrast, int *saturation)
996 *inv_table = c->srcColorspaceTable;
997 *table = c->dstColorspaceTable;
998 *srcRange = c->srcRange;
999 *dstRange = c->dstRange;
1000 *brightness = c->brightness;
1001 *contrast = c->contrast;
1002 *saturation = c->saturation;
1007 static int handle_jpeg(enum AVPixelFormat *format)
1010 case AV_PIX_FMT_YUVJ420P:
1011 *format = AV_PIX_FMT_YUV420P;
1013 case AV_PIX_FMT_YUVJ411P:
1014 *format = AV_PIX_FMT_YUV411P;
1016 case AV_PIX_FMT_YUVJ422P:
1017 *format = AV_PIX_FMT_YUV422P;
1019 case AV_PIX_FMT_YUVJ444P:
1020 *format = AV_PIX_FMT_YUV444P;
1022 case AV_PIX_FMT_YUVJ440P:
1023 *format = AV_PIX_FMT_YUV440P;
1025 case AV_PIX_FMT_GRAY8:
1026 case AV_PIX_FMT_YA8:
1027 case AV_PIX_FMT_GRAY16LE:
1028 case AV_PIX_FMT_GRAY16BE:
1029 case AV_PIX_FMT_YA16BE:
1030 case AV_PIX_FMT_YA16LE:
1037 static int handle_0alpha(enum AVPixelFormat *format)
1040 case AV_PIX_FMT_0BGR : *format = AV_PIX_FMT_ABGR ; return 1;
1041 case AV_PIX_FMT_BGR0 : *format = AV_PIX_FMT_BGRA ; return 4;
1042 case AV_PIX_FMT_0RGB : *format = AV_PIX_FMT_ARGB ; return 1;
1043 case AV_PIX_FMT_RGB0 : *format = AV_PIX_FMT_RGBA ; return 4;
1048 static int handle_xyz(enum AVPixelFormat *format)
1051 case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;
1052 case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;
1057 static void handle_formats(SwsContext *c)
1059 c->src0Alpha |= handle_0alpha(&c->srcFormat);
1060 c->dst0Alpha |= handle_0alpha(&c->dstFormat);
1061 c->srcXYZ |= handle_xyz(&c->srcFormat);
1062 c->dstXYZ |= handle_xyz(&c->dstFormat);
1063 if (c->srcXYZ || c->dstXYZ)
1067 SwsContext *sws_alloc_context(void)
1069 SwsContext *c = av_mallocz(sizeof(SwsContext));
1071 av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));
1074 c->av_class = &ff_sws_context_class;
1075 av_opt_set_defaults(c);
1081 static uint16_t * alloc_gamma_tbl(double e)
1085 tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);
1089 for (i = 0; i < 65536; ++i) {
1090 tbl[i] = pow(i / 65535.0, e) * 65535.0;
1095 static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)
1098 case AV_PIX_FMT_ARGB: return AV_PIX_FMT_RGB24;
1099 case AV_PIX_FMT_RGBA: return AV_PIX_FMT_RGB24;
1100 case AV_PIX_FMT_ABGR: return AV_PIX_FMT_BGR24;
1101 case AV_PIX_FMT_BGRA: return AV_PIX_FMT_BGR24;
1102 case AV_PIX_FMT_YA8: return AV_PIX_FMT_GRAY8;
1104 case AV_PIX_FMT_YUVA420P: return AV_PIX_FMT_YUV420P;
1105 case AV_PIX_FMT_YUVA422P: return AV_PIX_FMT_YUV422P;
1106 case AV_PIX_FMT_YUVA444P: return AV_PIX_FMT_YUV444P;
1108 case AV_PIX_FMT_GBRAP: return AV_PIX_FMT_GBRP;
1110 case AV_PIX_FMT_GBRAP10LE: return AV_PIX_FMT_GBRP10;
1111 case AV_PIX_FMT_GBRAP10BE: return AV_PIX_FMT_GBRP10;
1113 case AV_PIX_FMT_GBRAP12LE: return AV_PIX_FMT_GBRP12;
1114 case AV_PIX_FMT_GBRAP12BE: return AV_PIX_FMT_GBRP12;
1116 case AV_PIX_FMT_GBRAP16LE: return AV_PIX_FMT_GBRP16;
1117 case AV_PIX_FMT_GBRAP16BE: return AV_PIX_FMT_GBRP16;
1119 case AV_PIX_FMT_RGBA64LE: return AV_PIX_FMT_RGB48;
1120 case AV_PIX_FMT_RGBA64BE: return AV_PIX_FMT_RGB48;
1121 case AV_PIX_FMT_BGRA64LE: return AV_PIX_FMT_BGR48;
1122 case AV_PIX_FMT_BGRA64BE: return AV_PIX_FMT_BGR48;
1124 case AV_PIX_FMT_YA16BE: return AV_PIX_FMT_GRAY16;
1125 case AV_PIX_FMT_YA16LE: return AV_PIX_FMT_GRAY16;
1127 case AV_PIX_FMT_YUVA420P9BE: return AV_PIX_FMT_YUV420P9;
1128 case AV_PIX_FMT_YUVA422P9BE: return AV_PIX_FMT_YUV422P9;
1129 case AV_PIX_FMT_YUVA444P9BE: return AV_PIX_FMT_YUV444P9;
1130 case AV_PIX_FMT_YUVA420P9LE: return AV_PIX_FMT_YUV420P9;
1131 case AV_PIX_FMT_YUVA422P9LE: return AV_PIX_FMT_YUV422P9;
1132 case AV_PIX_FMT_YUVA444P9LE: return AV_PIX_FMT_YUV444P9;
1133 case AV_PIX_FMT_YUVA420P10BE: return AV_PIX_FMT_YUV420P10;
1134 case AV_PIX_FMT_YUVA422P10BE: return AV_PIX_FMT_YUV422P10;
1135 case AV_PIX_FMT_YUVA444P10BE: return AV_PIX_FMT_YUV444P10;
1136 case AV_PIX_FMT_YUVA420P10LE: return AV_PIX_FMT_YUV420P10;
1137 case AV_PIX_FMT_YUVA422P10LE: return AV_PIX_FMT_YUV422P10;
1138 case AV_PIX_FMT_YUVA444P10LE: return AV_PIX_FMT_YUV444P10;
1139 case AV_PIX_FMT_YUVA420P16BE: return AV_PIX_FMT_YUV420P16;
1140 case AV_PIX_FMT_YUVA422P16BE: return AV_PIX_FMT_YUV422P16;
1141 case AV_PIX_FMT_YUVA444P16BE: return AV_PIX_FMT_YUV444P16;
1142 case AV_PIX_FMT_YUVA420P16LE: return AV_PIX_FMT_YUV420P16;
1143 case AV_PIX_FMT_YUVA422P16LE: return AV_PIX_FMT_YUV422P16;
1144 case AV_PIX_FMT_YUVA444P16LE: return AV_PIX_FMT_YUV444P16;
1146 // case AV_PIX_FMT_AYUV64LE:
1147 // case AV_PIX_FMT_AYUV64BE:
1148 // case AV_PIX_FMT_PAL8:
1149 default: return AV_PIX_FMT_NONE;
1153 av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
1154 SwsFilter *dstFilter)
1157 int usesVFilter, usesHFilter;
1159 SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };
1164 int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 66, 16);
1165 int flags, cpu_flags;
1166 enum AVPixelFormat srcFormat = c->srcFormat;
1167 enum AVPixelFormat dstFormat = c->dstFormat;
1168 const AVPixFmtDescriptor *desc_src;
1169 const AVPixFmtDescriptor *desc_dst;
1171 enum AVPixelFormat tmpFmt;
1173 cpu_flags = av_get_cpu_flags();
1177 ff_sws_rgb2rgb_init();
1179 unscaled = (srcW == dstW && srcH == dstH);
1181 c->srcRange |= handle_jpeg(&c->srcFormat);
1182 c->dstRange |= handle_jpeg(&c->dstFormat);
1184 if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
1185 av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
1187 if (!c->contrast && !c->saturation && !c->dstFormatBpp)
1188 sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
1189 ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
1190 c->dstRange, 0, 1 << 16, 1 << 16);
1193 srcFormat = c->srcFormat;
1194 dstFormat = c->dstFormat;
1195 desc_src = av_pix_fmt_desc_get(srcFormat);
1196 desc_dst = av_pix_fmt_desc_get(dstFormat);
1198 // If the source has no alpha then disable alpha blendaway
1200 c->alphablend = SWS_ALPHA_BLEND_NONE;
1202 if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
1203 av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
1204 if (!sws_isSupportedInput(srcFormat)) {
1205 av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
1206 av_get_pix_fmt_name(srcFormat));
1207 return AVERROR(EINVAL);
1209 if (!sws_isSupportedOutput(dstFormat)) {
1210 av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",
1211 av_get_pix_fmt_name(dstFormat));
1212 return AVERROR(EINVAL);
1215 av_assert2(desc_src && desc_dst);
1217 i = flags & (SWS_POINT |
1229 /* provide a default scaler if not set by caller */
1231 if (dstW < srcW && dstH < srcH)
1232 flags |= SWS_BICUBIC;
1233 else if (dstW > srcW && dstH > srcH)
1234 flags |= SWS_BICUBIC;
1236 flags |= SWS_BICUBIC;
1238 } else if (i & (i - 1)) {
1239 av_log(c, AV_LOG_ERROR,
1240 "Exactly one scaler algorithm must be chosen, got %X\n", i);
1241 return AVERROR(EINVAL);
1244 if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {
1245 /* FIXME check if these are enough and try to lower them after
1246 * fixing the relevant parts of the code */
1247 av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",
1248 srcW, srcH, dstW, dstH);
1249 return AVERROR(EINVAL);
1251 if (flags & SWS_FAST_BILINEAR) {
1252 if (srcW < 8 || dstW < 8) {
1253 flags ^= SWS_FAST_BILINEAR | SWS_BILINEAR;
1259 dstFilter = &dummyFilter;
1261 srcFilter = &dummyFilter;
1263 c->lumXInc = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
1264 c->lumYInc = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;
1265 c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
1266 c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
1267 c->vRounder = 4 * 0x0001000100010001ULL;
1269 usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||
1270 (srcFilter->chrV && srcFilter->chrV->length > 1) ||
1271 (dstFilter->lumV && dstFilter->lumV->length > 1) ||
1272 (dstFilter->chrV && dstFilter->chrV->length > 1);
1273 usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||
1274 (srcFilter->chrH && srcFilter->chrH->length > 1) ||
1275 (dstFilter->lumH && dstFilter->lumH->length > 1) ||
1276 (dstFilter->chrH && dstFilter->chrH->length > 1);
1278 av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);
1279 av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);
1281 if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
1283 av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
1284 flags |= SWS_FULL_CHR_H_INT;
1288 if ( c->chrSrcHSubSample == 0
1289 && c->chrSrcVSubSample == 0
1290 && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER
1291 && !(c->flags & SWS_FAST_BILINEAR)
1293 av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");
1294 flags |= SWS_FULL_CHR_H_INT;
1299 if (c->dither == SWS_DITHER_AUTO) {
1300 if (flags & SWS_ERROR_DIFFUSION)
1301 c->dither = SWS_DITHER_ED;
1304 if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
1305 dstFormat == AV_PIX_FMT_RGB4_BYTE ||
1306 dstFormat == AV_PIX_FMT_BGR8 ||
1307 dstFormat == AV_PIX_FMT_RGB8) {
1308 if (c->dither == SWS_DITHER_AUTO)
1309 c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;
1310 if (!(flags & SWS_FULL_CHR_H_INT)) {
1311 if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {
1312 av_log(c, AV_LOG_DEBUG,
1313 "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",
1314 av_get_pix_fmt_name(dstFormat));
1315 flags |= SWS_FULL_CHR_H_INT;
1319 if (flags & SWS_FULL_CHR_H_INT) {
1320 if (c->dither == SWS_DITHER_BAYER) {
1321 av_log(c, AV_LOG_DEBUG,
1322 "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
1323 av_get_pix_fmt_name(dstFormat));
1324 c->dither = SWS_DITHER_ED;
1328 if (isPlanarRGB(dstFormat)) {
1329 if (!(flags & SWS_FULL_CHR_H_INT)) {
1330 av_log(c, AV_LOG_DEBUG,
1331 "%s output is not supported with half chroma resolution, switching to full\n",
1332 av_get_pix_fmt_name(dstFormat));
1333 flags |= SWS_FULL_CHR_H_INT;
1338 /* reuse chroma for 2 pixels RGB/BGR unless user wants full
1339 * chroma interpolation */
1340 if (flags & SWS_FULL_CHR_H_INT &&
1341 isAnyRGB(dstFormat) &&
1342 !isPlanarRGB(dstFormat) &&
1343 dstFormat != AV_PIX_FMT_RGBA64LE &&
1344 dstFormat != AV_PIX_FMT_RGBA64BE &&
1345 dstFormat != AV_PIX_FMT_BGRA64LE &&
1346 dstFormat != AV_PIX_FMT_BGRA64BE &&
1347 dstFormat != AV_PIX_FMT_RGB48LE &&
1348 dstFormat != AV_PIX_FMT_RGB48BE &&
1349 dstFormat != AV_PIX_FMT_BGR48LE &&
1350 dstFormat != AV_PIX_FMT_BGR48BE &&
1351 dstFormat != AV_PIX_FMT_RGBA &&
1352 dstFormat != AV_PIX_FMT_ARGB &&
1353 dstFormat != AV_PIX_FMT_BGRA &&
1354 dstFormat != AV_PIX_FMT_ABGR &&
1355 dstFormat != AV_PIX_FMT_RGB24 &&
1356 dstFormat != AV_PIX_FMT_BGR24 &&
1357 dstFormat != AV_PIX_FMT_BGR4_BYTE &&
1358 dstFormat != AV_PIX_FMT_RGB4_BYTE &&
1359 dstFormat != AV_PIX_FMT_BGR8 &&
1360 dstFormat != AV_PIX_FMT_RGB8
1362 av_log(c, AV_LOG_WARNING,
1363 "full chroma interpolation for destination format '%s' not yet implemented\n",
1364 av_get_pix_fmt_name(dstFormat));
1365 flags &= ~SWS_FULL_CHR_H_INT;
1368 if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))
1369 c->chrDstHSubSample = 1;
1371 // drop some chroma lines if the user wants it
1372 c->vChrDrop = (flags & SWS_SRC_V_CHR_DROP_MASK) >>
1373 SWS_SRC_V_CHR_DROP_SHIFT;
1374 c->chrSrcVSubSample += c->vChrDrop;
1376 /* drop every other pixel for chroma calculation unless user
1377 * wants full chroma */
1378 if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP) &&
1379 srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
1380 srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
1381 srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&
1382 srcFormat != AV_PIX_FMT_GBRP9BE && srcFormat != AV_PIX_FMT_GBRP9LE &&
1383 srcFormat != AV_PIX_FMT_GBRP10BE && srcFormat != AV_PIX_FMT_GBRP10LE &&
1384 srcFormat != AV_PIX_FMT_GBRAP10BE && srcFormat != AV_PIX_FMT_GBRAP10LE &&
1385 srcFormat != AV_PIX_FMT_GBRP12BE && srcFormat != AV_PIX_FMT_GBRP12LE &&
1386 srcFormat != AV_PIX_FMT_GBRAP12BE && srcFormat != AV_PIX_FMT_GBRAP12LE &&
1387 srcFormat != AV_PIX_FMT_GBRP14BE && srcFormat != AV_PIX_FMT_GBRP14LE &&
1388 srcFormat != AV_PIX_FMT_GBRP16BE && srcFormat != AV_PIX_FMT_GBRP16LE &&
1389 srcFormat != AV_PIX_FMT_GBRAP16BE && srcFormat != AV_PIX_FMT_GBRAP16LE &&
1390 ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
1391 (flags & SWS_FAST_BILINEAR)))
1392 c->chrSrcHSubSample = 1;
1394 // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.
1395 c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);
1396 c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);
1397 c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);
1398 c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);
1400 FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);
1402 c->srcBpc = desc_src->comp[0].depth;
1405 c->dstBpc = desc_dst->comp[0].depth;
1408 if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)
1410 if (c->dstBpc == 16)
1413 if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
1414 c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&
1415 c->chrDstW >= c->chrSrcW &&
1417 if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0
1419 && (flags & SWS_FAST_BILINEAR)) {
1420 if (flags & SWS_PRINT_INFO)
1421 av_log(c, AV_LOG_INFO,
1422 "output width is not a multiple of 32 -> no MMXEXT scaler\n");
1424 if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))
1425 c->canMMXEXTBeUsed = 0;
1427 c->canMMXEXTBeUsed = 0;
1429 c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
1430 c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;
1432 /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src
1433 * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do
1435 * n-2 is the last chrominance sample available.
1436 * This is not perfect, but no one should notice the difference, the more
1437 * correct variant would be like the vertical one, but that would require
1438 * some special code for the first and last pixel */
1439 if (flags & SWS_FAST_BILINEAR) {
1440 if (c->canMMXEXTBeUsed) {
1444 // we don't use the x86 asm scaler if MMX is available
1445 else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {
1446 c->lumXInc = ((int64_t)(srcW - 2) << 16) / (dstW - 2) - 20;
1447 c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;
1451 // hardcoded for now
1452 c->gamma_value = 2.2;
1453 tmpFmt = AV_PIX_FMT_RGBA64LE;
1456 if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {
1458 c->cascaded_context[0] = NULL;
1460 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1461 srcW, srcH, tmpFmt, 64);
1465 c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
1467 flags, NULL, NULL, c->param);
1468 if (!c->cascaded_context[0]) {
1472 c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,
1474 flags, srcFilter, dstFilter, c->param);
1476 if (!c->cascaded_context[1])
1479 c2 = c->cascaded_context[1];
1480 c2->is_internal_gamma = 1;
1481 c2->gamma = alloc_gamma_tbl( c->gamma_value);
1482 c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);
1483 if (!c2->gamma || !c2->inv_gamma)
1484 return AVERROR(ENOMEM);
1486 // is_internal_flag is set after creating the context
1487 // to properly create the gamma convert FilterDescriptor
1488 // we have to re-initialize it
1489 ff_free_filters(c2);
1490 if (ff_init_filters(c2) < 0) {
1491 sws_freeContext(c2);
1495 c->cascaded_context[2] = NULL;
1496 if (dstFormat != tmpFmt) {
1497 ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,
1498 dstW, dstH, tmpFmt, 64);
1502 c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,
1503 dstW, dstH, dstFormat,
1504 flags, NULL, NULL, c->param);
1505 if (!c->cascaded_context[2])
1511 if (isBayer(srcFormat)) {
1513 (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {
1514 enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;
1516 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1517 srcW, srcH, tmpFormat, 64);
1521 c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
1522 srcW, srcH, tmpFormat,
1523 flags, srcFilter, NULL, c->param);
1524 if (!c->cascaded_context[0])
1527 c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,
1528 dstW, dstH, dstFormat,
1529 flags, NULL, dstFilter, c->param);
1530 if (!c->cascaded_context[1])
1536 if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {
1537 enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);
1539 if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE)
1541 dstFormat != tmpFormat ||
1542 usesHFilter || usesVFilter ||
1543 c->srcRange != c->dstRange
1545 c->cascaded_mainindex = 1;
1546 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1547 srcW, srcH, tmpFormat, 64);
1551 c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,
1552 srcW, srcH, tmpFormat,
1554 if (!c->cascaded_context[0])
1556 c->cascaded_context[0]->alphablend = c->alphablend;
1557 ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
1561 c->cascaded_context[1] = sws_alloc_set_opts(srcW, srcH, tmpFormat,
1562 dstW, dstH, dstFormat,
1564 if (!c->cascaded_context[1])
1567 c->cascaded_context[1]->srcRange = c->srcRange;
1568 c->cascaded_context[1]->dstRange = c->dstRange;
1569 ret = sws_init_context(c->cascaded_context[1], srcFilter , dstFilter);
1577 #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
1579 /* precalculate horizontal scaler filter coefficients */
1581 #if HAVE_MMXEXT_INLINE
1582 // can't downscale !!!
1583 if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {
1584 c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,
1586 c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,
1587 NULL, NULL, NULL, 4);
1590 c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
1591 PROT_READ | PROT_WRITE,
1592 MAP_PRIVATE | MAP_ANONYMOUS,
1594 c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
1595 PROT_READ | PROT_WRITE,
1596 MAP_PRIVATE | MAP_ANONYMOUS,
1598 #elif HAVE_VIRTUALALLOC
1599 c->lumMmxextFilterCode = VirtualAlloc(NULL,
1600 c->lumMmxextFilterCodeSize,
1602 PAGE_EXECUTE_READWRITE);
1603 c->chrMmxextFilterCode = VirtualAlloc(NULL,
1604 c->chrMmxextFilterCodeSize,
1606 PAGE_EXECUTE_READWRITE);
1608 c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
1609 c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);
1612 #ifdef MAP_ANONYMOUS
1613 if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)
1615 if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)
1618 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");
1619 return AVERROR(ENOMEM);
1622 FF_ALLOCZ_OR_GOTO(c, c->hLumFilter, (dstW / 8 + 8) * sizeof(int16_t), fail);
1623 FF_ALLOCZ_OR_GOTO(c, c->hChrFilter, (c->chrDstW / 4 + 8) * sizeof(int16_t), fail);
1624 FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW / 2 / 8 + 8) * sizeof(int32_t), fail);
1625 FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);
1627 ff_init_hscaler_mmxext( dstW, c->lumXInc, c->lumMmxextFilterCode,
1628 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
1629 ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
1630 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
1633 if ( mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1
1634 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {
1635 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");
1640 #endif /* HAVE_MMXEXT_INLINE */
1642 const int filterAlign = X86_MMX(cpu_flags) ? 4 :
1643 PPC_ALTIVEC(cpu_flags) ? 8 :
1644 have_neon(cpu_flags) ? 8 : 1;
1646 if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,
1647 &c->hLumFilterSize, c->lumXInc,
1648 srcW, dstW, filterAlign, 1 << 14,
1649 (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1650 cpu_flags, srcFilter->lumH, dstFilter->lumH,
1652 get_local_pos(c, 0, 0, 0),
1653 get_local_pos(c, 0, 0, 0))) < 0)
1655 if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,
1656 &c->hChrFilterSize, c->chrXInc,
1657 c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
1658 (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1659 cpu_flags, srcFilter->chrH, dstFilter->chrH,
1661 get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
1662 get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)
1665 } // initialize horizontal stuff
1667 /* precalculate vertical scaler filter coefficients */
1669 const int filterAlign = X86_MMX(cpu_flags) ? 2 :
1670 PPC_ALTIVEC(cpu_flags) ? 8 :
1671 have_neon(cpu_flags) ? 2 : 1;
1673 if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
1674 c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
1675 (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1676 cpu_flags, srcFilter->lumV, dstFilter->lumV,
1678 get_local_pos(c, 0, 0, 1),
1679 get_local_pos(c, 0, 0, 1))) < 0)
1681 if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
1682 c->chrYInc, c->chrSrcH, c->chrDstH,
1683 filterAlign, (1 << 12),
1684 (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1685 cpu_flags, srcFilter->chrV, dstFilter->chrV,
1687 get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
1688 get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)
1693 FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH, fail);
1694 FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);
1696 for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {
1698 short *p = (short *)&c->vYCoeffsBank[i];
1699 for (j = 0; j < 8; j++)
1700 p[j] = c->vLumFilter[i];
1703 for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {
1705 short *p = (short *)&c->vCCoeffsBank[i];
1706 for (j = 0; j < 8; j++)
1707 p[j] = c->vChrFilter[i];
1712 for (i = 0; i < 4; i++)
1713 FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);
1715 c->needAlpha = (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) ? 1 : 0;
1717 // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)
1718 c->uv_off = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);
1719 c->uv_offx2 = dst_stride + 16;
1721 av_assert0(c->chrDstH <= dstH);
1723 if (flags & SWS_PRINT_INFO) {
1724 const char *scaler = NULL, *cpucaps;
1726 for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
1727 if (flags & scale_algorithms[i].flag) {
1728 scaler = scale_algorithms[i].description;
1733 scaler = "ehh flags invalid?!";
1734 av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",
1736 av_get_pix_fmt_name(srcFormat),
1738 dstFormat == AV_PIX_FMT_BGR555 || dstFormat == AV_PIX_FMT_BGR565 ||
1739 dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
1740 dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?
1745 av_get_pix_fmt_name(dstFormat));
1747 if (INLINE_MMXEXT(cpu_flags))
1749 else if (INLINE_AMD3DNOW(cpu_flags))
1751 else if (INLINE_MMX(cpu_flags))
1753 else if (PPC_ALTIVEC(cpu_flags))
1754 cpucaps = "AltiVec";
1758 av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);
1760 av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);
1761 av_log(c, AV_LOG_DEBUG,
1762 "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1763 c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);
1764 av_log(c, AV_LOG_DEBUG,
1765 "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1766 c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,
1767 c->chrXInc, c->chrYInc);
1770 /* alpha blend special case, note this has been split via cascaded contexts if its scaled */
1771 if (unscaled && !usesHFilter && !usesVFilter &&
1772 c->alphablend != SWS_ALPHA_BLEND_NONE &&
1773 isALPHA(srcFormat) &&
1774 (c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&
1775 alphaless_fmt(srcFormat) == dstFormat
1777 c->swscale = ff_sws_alphablendaway;
1779 if (flags & SWS_PRINT_INFO)
1780 av_log(c, AV_LOG_INFO,
1781 "using alpha blendaway %s -> %s special converter\n",
1782 av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1786 /* unscaled special cases */
1787 if (unscaled && !usesHFilter && !usesVFilter &&
1788 (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {
1789 ff_get_unscaled_swscale(c);
1792 if (flags & SWS_PRINT_INFO)
1793 av_log(c, AV_LOG_INFO,
1794 "using unscaled %s -> %s special converter\n",
1795 av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1800 c->swscale = ff_getSwsFunc(c);
1801 return ff_init_filters(c);
1802 fail: // FIXME replace things by appropriate error codes
1803 if (ret == RETCODE_USE_CASCADE) {
1804 int tmpW = sqrt(srcW * (int64_t)dstW);
1805 int tmpH = sqrt(srcH * (int64_t)dstH);
1806 enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;
1808 if (isALPHA(srcFormat))
1809 tmpFormat = AV_PIX_FMT_YUVA420P;
1811 if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)
1812 return AVERROR(EINVAL);
1814 ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
1815 tmpW, tmpH, tmpFormat, 64);
1819 c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
1820 tmpW, tmpH, tmpFormat,
1821 flags, srcFilter, NULL, c->param);
1822 if (!c->cascaded_context[0])
1825 c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,
1826 dstW, dstH, dstFormat,
1827 flags, NULL, dstFilter, c->param);
1828 if (!c->cascaded_context[1])
1835 SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,
1836 int dstW, int dstH, enum AVPixelFormat dstFormat,
1837 int flags, const double *param)
1841 if (!(c = sws_alloc_context()))
1849 c->srcFormat = srcFormat;
1850 c->dstFormat = dstFormat;
1853 c->param[0] = param[0];
1854 c->param[1] = param[1];
1860 SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
1861 int dstW, int dstH, enum AVPixelFormat dstFormat,
1862 int flags, SwsFilter *srcFilter,
1863 SwsFilter *dstFilter, const double *param)
1867 c = sws_alloc_set_opts(srcW, srcH, srcFormat,
1868 dstW, dstH, dstFormat,
1873 if (sws_init_context(c, srcFilter, dstFilter) < 0) {
1881 static int isnan_vec(SwsVector *a)
1884 for (i=0; i<a->length; i++)
1885 if (isnan(a->coeff[i]))
1890 static void makenan_vec(SwsVector *a)
1893 for (i=0; i<a->length; i++)
1897 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
1898 float lumaSharpen, float chromaSharpen,
1899 float chromaHShift, float chromaVShift,
1902 SwsFilter *filter = av_malloc(sizeof(SwsFilter));
1906 if (lumaGBlur != 0.0) {
1907 filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
1908 filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);
1910 filter->lumH = sws_getIdentityVec();
1911 filter->lumV = sws_getIdentityVec();
1914 if (chromaGBlur != 0.0) {
1915 filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
1916 filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);
1918 filter->chrH = sws_getIdentityVec();
1919 filter->chrV = sws_getIdentityVec();
1922 if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)
1925 if (chromaSharpen != 0.0) {
1926 SwsVector *id = sws_getIdentityVec();
1929 sws_scaleVec(filter->chrH, -chromaSharpen);
1930 sws_scaleVec(filter->chrV, -chromaSharpen);
1931 sws_addVec(filter->chrH, id);
1932 sws_addVec(filter->chrV, id);
1936 if (lumaSharpen != 0.0) {
1937 SwsVector *id = sws_getIdentityVec();
1940 sws_scaleVec(filter->lumH, -lumaSharpen);
1941 sws_scaleVec(filter->lumV, -lumaSharpen);
1942 sws_addVec(filter->lumH, id);
1943 sws_addVec(filter->lumV, id);
1947 if (chromaHShift != 0.0)
1948 sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));
1950 if (chromaVShift != 0.0)
1951 sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));
1953 sws_normalizeVec(filter->chrH, 1.0);
1954 sws_normalizeVec(filter->chrV, 1.0);
1955 sws_normalizeVec(filter->lumH, 1.0);
1956 sws_normalizeVec(filter->lumV, 1.0);
1958 if (isnan_vec(filter->chrH) ||
1959 isnan_vec(filter->chrV) ||
1960 isnan_vec(filter->lumH) ||
1961 isnan_vec(filter->lumV))
1965 sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
1967 sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
1972 sws_freeVec(filter->lumH);
1973 sws_freeVec(filter->lumV);
1974 sws_freeVec(filter->chrH);
1975 sws_freeVec(filter->chrV);
1980 SwsVector *sws_allocVec(int length)
1984 if(length <= 0 || length > INT_MAX/ sizeof(double))
1987 vec = av_malloc(sizeof(SwsVector));
1990 vec->length = length;
1991 vec->coeff = av_malloc(sizeof(double) * length);
1997 SwsVector *sws_getGaussianVec(double variance, double quality)
1999 const int length = (int)(variance * quality + 0.5) | 1;
2001 double middle = (length - 1) * 0.5;
2004 if(variance < 0 || quality < 0)
2007 vec = sws_allocVec(length);
2012 for (i = 0; i < length; i++) {
2013 double dist = i - middle;
2014 vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
2015 sqrt(2 * variance * M_PI);
2018 sws_normalizeVec(vec, 1.0);
2024 * Allocate and return a vector with length coefficients, all
2025 * with the same value c.
2027 #if !FF_API_SWS_VECTOR
2030 SwsVector *sws_getConstVec(double c, int length)
2033 SwsVector *vec = sws_allocVec(length);
2038 for (i = 0; i < length; i++)
2045 * Allocate and return a vector with just one coefficient, with
2048 #if !FF_API_SWS_VECTOR
2051 SwsVector *sws_getIdentityVec(void)
2053 return sws_getConstVec(1.0, 1);
2056 static double sws_dcVec(SwsVector *a)
2061 for (i = 0; i < a->length; i++)
2067 void sws_scaleVec(SwsVector *a, double scalar)
2071 for (i = 0; i < a->length; i++)
2072 a->coeff[i] *= scalar;
2075 void sws_normalizeVec(SwsVector *a, double height)
2077 sws_scaleVec(a, height / sws_dcVec(a));
2080 #if FF_API_SWS_VECTOR
2081 static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
2083 int length = a->length + b->length - 1;
2085 SwsVector *vec = sws_getConstVec(0.0, length);
2090 for (i = 0; i < a->length; i++) {
2091 for (j = 0; j < b->length; j++) {
2092 vec->coeff[i + j] += a->coeff[i] * b->coeff[j];
2100 static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
2102 int length = FFMAX(a->length, b->length);
2104 SwsVector *vec = sws_getConstVec(0.0, length);
2109 for (i = 0; i < a->length; i++)
2110 vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
2111 for (i = 0; i < b->length; i++)
2112 vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];
2117 #if FF_API_SWS_VECTOR
2118 static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
2120 int length = FFMAX(a->length, b->length);
2122 SwsVector *vec = sws_getConstVec(0.0, length);
2127 for (i = 0; i < a->length; i++)
2128 vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
2129 for (i = 0; i < b->length; i++)
2130 vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];
2136 /* shift left / or right if "shift" is negative */
2137 static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
2139 int length = a->length + FFABS(shift) * 2;
2141 SwsVector *vec = sws_getConstVec(0.0, length);
2146 for (i = 0; i < a->length; i++) {
2147 vec->coeff[i + (length - 1) / 2 -
2148 (a->length - 1) / 2 - shift] = a->coeff[i];
2154 #if !FF_API_SWS_VECTOR
2157 void sws_shiftVec(SwsVector *a, int shift)
2159 SwsVector *shifted = sws_getShiftedVec(a, shift);
2165 a->coeff = shifted->coeff;
2166 a->length = shifted->length;
2170 #if !FF_API_SWS_VECTOR
2173 void sws_addVec(SwsVector *a, SwsVector *b)
2175 SwsVector *sum = sws_sumVec(a, b);
2181 a->coeff = sum->coeff;
2182 a->length = sum->length;
2186 #if FF_API_SWS_VECTOR
2187 void sws_subVec(SwsVector *a, SwsVector *b)
2189 SwsVector *diff = sws_diffVec(a, b);
2195 a->coeff = diff->coeff;
2196 a->length = diff->length;
2200 void sws_convVec(SwsVector *a, SwsVector *b)
2202 SwsVector *conv = sws_getConvVec(a, b);
2208 a->coeff = conv->coeff;
2209 a->length = conv->length;
2213 SwsVector *sws_cloneVec(SwsVector *a)
2215 SwsVector *vec = sws_allocVec(a->length);
2220 memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));
2227 * Print with av_log() a textual representation of the vector a
2228 * if log_level <= av_log_level.
2230 #if !FF_API_SWS_VECTOR
2233 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
2240 for (i = 0; i < a->length; i++)
2241 if (a->coeff[i] > max)
2244 for (i = 0; i < a->length; i++)
2245 if (a->coeff[i] < min)
2250 for (i = 0; i < a->length; i++) {
2251 int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);
2252 av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
2254 av_log(log_ctx, log_level, " ");
2255 av_log(log_ctx, log_level, "|\n");
2259 void sws_freeVec(SwsVector *a)
2263 av_freep(&a->coeff);
2268 void sws_freeFilter(SwsFilter *filter)
2273 sws_freeVec(filter->lumH);
2274 sws_freeVec(filter->lumV);
2275 sws_freeVec(filter->chrH);
2276 sws_freeVec(filter->chrV);
2280 void sws_freeContext(SwsContext *c)
2286 for (i = 0; i < 4; i++)
2287 av_freep(&c->dither_error[i]);
2289 av_freep(&c->vLumFilter);
2290 av_freep(&c->vChrFilter);
2291 av_freep(&c->hLumFilter);
2292 av_freep(&c->hChrFilter);
2294 av_freep(&c->vYCoeffsBank);
2295 av_freep(&c->vCCoeffsBank);
2298 av_freep(&c->vLumFilterPos);
2299 av_freep(&c->vChrFilterPos);
2300 av_freep(&c->hLumFilterPos);
2301 av_freep(&c->hChrFilterPos);
2305 if (c->lumMmxextFilterCode)
2306 munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
2307 if (c->chrMmxextFilterCode)
2308 munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);
2309 #elif HAVE_VIRTUALALLOC
2310 if (c->lumMmxextFilterCode)
2311 VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
2312 if (c->chrMmxextFilterCode)
2313 VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);
2315 av_free(c->lumMmxextFilterCode);
2316 av_free(c->chrMmxextFilterCode);
2318 c->lumMmxextFilterCode = NULL;
2319 c->chrMmxextFilterCode = NULL;
2320 #endif /* HAVE_MMX_INLINE */
2322 av_freep(&c->yuvTable);
2323 av_freep(&c->formatConvBuffer);
2325 sws_freeContext(c->cascaded_context[0]);
2326 sws_freeContext(c->cascaded_context[1]);
2327 sws_freeContext(c->cascaded_context[2]);
2328 memset(c->cascaded_context, 0, sizeof(c->cascaded_context));
2329 av_freep(&c->cascaded_tmp[0]);
2330 av_freep(&c->cascaded1_tmp[0]);
2332 av_freep(&c->gamma);
2333 av_freep(&c->inv_gamma);
2340 struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,
2341 int srcH, enum AVPixelFormat srcFormat,
2343 enum AVPixelFormat dstFormat, int flags,
2344 SwsFilter *srcFilter,
2345 SwsFilter *dstFilter,
2346 const double *param)
2348 static const double default_param[2] = { SWS_PARAM_DEFAULT,
2349 SWS_PARAM_DEFAULT };
2350 int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,
2351 src_v_chr_pos = -513, dst_v_chr_pos = -513;
2354 param = default_param;
2357 (context->srcW != srcW ||
2358 context->srcH != srcH ||
2359 context->srcFormat != srcFormat ||
2360 context->dstW != dstW ||
2361 context->dstH != dstH ||
2362 context->dstFormat != dstFormat ||
2363 context->flags != flags ||
2364 context->param[0] != param[0] ||
2365 context->param[1] != param[1])) {
2367 av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);
2368 av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);
2369 av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);
2370 av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);
2371 sws_freeContext(context);
2376 if (!(context = sws_alloc_context()))
2378 context->srcW = srcW;
2379 context->srcH = srcH;
2380 context->srcFormat = srcFormat;
2381 context->dstW = dstW;
2382 context->dstH = dstH;
2383 context->dstFormat = dstFormat;
2384 context->flags = flags;
2385 context->param[0] = param[0];
2386 context->param[1] = param[1];
2388 av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);
2389 av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);
2390 av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);
2391 av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);
2393 if (sws_init_context(context, srcFilter, dstFilter) < 0) {
2394 sws_freeContext(context);