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utils.c
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1 /*
2  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #include "config.h"
22 
23 #define _SVID_SOURCE // needed for MAP_ANONYMOUS
24 #define _DARWIN_C_SOURCE // needed for MAP_ANON
25 #include <inttypes.h>
26 #include <math.h>
27 #include <stdio.h>
28 #include <string.h>
29 #if HAVE_SYS_MMAN_H
30 #include <sys/mman.h>
31 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
32 #define MAP_ANONYMOUS MAP_ANON
33 #endif
34 #endif
35 #if HAVE_VIRTUALALLOC
36 #define WIN32_LEAN_AND_MEAN
37 #include <windows.h>
38 #endif
39 
40 #include "libavutil/attributes.h"
41 #include "libavutil/avassert.h"
42 #include "libavutil/avutil.h"
43 #include "libavutil/bswap.h"
44 #include "libavutil/cpu.h"
45 #include "libavutil/intreadwrite.h"
46 #include "libavutil/mathematics.h"
47 #include "libavutil/opt.h"
48 #include "libavutil/pixdesc.h"
49 #include "libavutil/x86/asm.h"
50 #include "libavutil/x86/cpu.h"
51 #include "rgb2rgb.h"
52 #include "swscale.h"
53 #include "swscale_internal.h"
54 
55 unsigned swscale_version(void)
56 {
57  av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);
58  return LIBSWSCALE_VERSION_INT;
59 }
60 
61 const char *swscale_configuration(void)
62 {
63  return FFMPEG_CONFIGURATION;
64 }
65 
66 const char *swscale_license(void)
67 {
68 #define LICENSE_PREFIX "libswscale license: "
69  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
70 }
71 
72 #define RET 0xC3 // near return opcode for x86
73 
74 typedef struct FormatEntry {
75  uint8_t is_supported_in :1;
76  uint8_t is_supported_out :1;
77  uint8_t is_supported_endianness :1;
78 } FormatEntry;
79 
80 static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
81  [AV_PIX_FMT_YUV420P] = { 1, 1 },
82  [AV_PIX_FMT_YUYV422] = { 1, 1 },
83  [AV_PIX_FMT_RGB24] = { 1, 1 },
84  [AV_PIX_FMT_BGR24] = { 1, 1 },
85  [AV_PIX_FMT_YUV422P] = { 1, 1 },
86  [AV_PIX_FMT_YUV444P] = { 1, 1 },
87  [AV_PIX_FMT_YUV410P] = { 1, 1 },
88  [AV_PIX_FMT_YUV411P] = { 1, 1 },
89  [AV_PIX_FMT_GRAY8] = { 1, 1 },
90  [AV_PIX_FMT_MONOWHITE] = { 1, 1 },
91  [AV_PIX_FMT_MONOBLACK] = { 1, 1 },
92  [AV_PIX_FMT_PAL8] = { 1, 0 },
93  [AV_PIX_FMT_YUVJ420P] = { 1, 1 },
94  [AV_PIX_FMT_YUVJ422P] = { 1, 1 },
95  [AV_PIX_FMT_YUVJ444P] = { 1, 1 },
96  [AV_PIX_FMT_UYVY422] = { 1, 1 },
97  [AV_PIX_FMT_UYYVYY411] = { 0, 0 },
98  [AV_PIX_FMT_BGR8] = { 1, 1 },
99  [AV_PIX_FMT_BGR4] = { 0, 1 },
100  [AV_PIX_FMT_BGR4_BYTE] = { 1, 1 },
101  [AV_PIX_FMT_RGB8] = { 1, 1 },
102  [AV_PIX_FMT_RGB4] = { 0, 1 },
103  [AV_PIX_FMT_RGB4_BYTE] = { 1, 1 },
104  [AV_PIX_FMT_NV12] = { 1, 1 },
105  [AV_PIX_FMT_NV21] = { 1, 1 },
106  [AV_PIX_FMT_ARGB] = { 1, 1 },
107  [AV_PIX_FMT_RGBA] = { 1, 1 },
108  [AV_PIX_FMT_ABGR] = { 1, 1 },
109  [AV_PIX_FMT_BGRA] = { 1, 1 },
110  [AV_PIX_FMT_0RGB] = { 1, 1 },
111  [AV_PIX_FMT_RGB0] = { 1, 1 },
112  [AV_PIX_FMT_0BGR] = { 1, 1 },
113  [AV_PIX_FMT_BGR0] = { 1, 1 },
114  [AV_PIX_FMT_GRAY16BE] = { 1, 1 },
115  [AV_PIX_FMT_GRAY16LE] = { 1, 1 },
116  [AV_PIX_FMT_YUV440P] = { 1, 1 },
117  [AV_PIX_FMT_YUVJ440P] = { 1, 1 },
118  [AV_PIX_FMT_YUVA420P] = { 1, 1 },
119  [AV_PIX_FMT_YUVA422P] = { 1, 1 },
120  [AV_PIX_FMT_YUVA444P] = { 1, 1 },
121  [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
122  [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
123  [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
124  [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
125  [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
126  [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
127  [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
128  [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
129  [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
130  [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
131  [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
132  [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
133  [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
134  [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
135  [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
136  [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
137  [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
138  [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },
139  [AV_PIX_FMT_RGB48BE] = { 1, 1 },
140  [AV_PIX_FMT_RGB48LE] = { 1, 1 },
141  [AV_PIX_FMT_RGBA64BE] = { 1, 1 },
142  [AV_PIX_FMT_RGBA64LE] = { 1, 1 },
143  [AV_PIX_FMT_RGB565BE] = { 1, 1 },
144  [AV_PIX_FMT_RGB565LE] = { 1, 1 },
145  [AV_PIX_FMT_RGB555BE] = { 1, 1 },
146  [AV_PIX_FMT_RGB555LE] = { 1, 1 },
147  [AV_PIX_FMT_BGR565BE] = { 1, 1 },
148  [AV_PIX_FMT_BGR565LE] = { 1, 1 },
149  [AV_PIX_FMT_BGR555BE] = { 1, 1 },
150  [AV_PIX_FMT_BGR555LE] = { 1, 1 },
151  [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
152  [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
153  [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
154  [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
155  [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
156  [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
157  [AV_PIX_FMT_RGB444LE] = { 1, 1 },
158  [AV_PIX_FMT_RGB444BE] = { 1, 1 },
159  [AV_PIX_FMT_BGR444LE] = { 1, 1 },
160  [AV_PIX_FMT_BGR444BE] = { 1, 1 },
161  [AV_PIX_FMT_Y400A] = { 1, 0 },
162  [AV_PIX_FMT_BGR48BE] = { 1, 1 },
163  [AV_PIX_FMT_BGR48LE] = { 1, 1 },
164  [AV_PIX_FMT_BGRA64BE] = { 0, 0 },
165  [AV_PIX_FMT_BGRA64LE] = { 0, 0 },
166  [AV_PIX_FMT_YUV420P9BE] = { 1, 1 },
167  [AV_PIX_FMT_YUV420P9LE] = { 1, 1 },
168  [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
169  [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },
170  [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
171  [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
172  [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
173  [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },
174  [AV_PIX_FMT_YUV422P9BE] = { 1, 1 },
175  [AV_PIX_FMT_YUV422P9LE] = { 1, 1 },
176  [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
177  [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },
178  [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
179  [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
180  [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
181  [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },
182  [AV_PIX_FMT_YUV444P9BE] = { 1, 1 },
183  [AV_PIX_FMT_YUV444P9LE] = { 1, 1 },
184  [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
185  [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },
186  [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
187  [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
188  [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
189  [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },
190  [AV_PIX_FMT_GBRP] = { 1, 1 },
191  [AV_PIX_FMT_GBRP9LE] = { 1, 1 },
192  [AV_PIX_FMT_GBRP9BE] = { 1, 1 },
193  [AV_PIX_FMT_GBRP10LE] = { 1, 1 },
194  [AV_PIX_FMT_GBRP10BE] = { 1, 1 },
195  [AV_PIX_FMT_GBRP12LE] = { 1, 1 },
196  [AV_PIX_FMT_GBRP12BE] = { 1, 1 },
197  [AV_PIX_FMT_GBRP14LE] = { 1, 1 },
198  [AV_PIX_FMT_GBRP14BE] = { 1, 1 },
199  [AV_PIX_FMT_GBRP16LE] = { 1, 0 },
200  [AV_PIX_FMT_GBRP16BE] = { 1, 0 },
201  [AV_PIX_FMT_XYZ12BE] = { 1, 0, 1 },
202  [AV_PIX_FMT_XYZ12LE] = { 1, 0, 1 },
203  [AV_PIX_FMT_GBRAP] = { 1, 1 },
204  [AV_PIX_FMT_GBRAP16LE] = { 1, 0 },
205  [AV_PIX_FMT_GBRAP16BE] = { 1, 0 },
206 };
207 
208 int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
209 {
210  return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
211  format_entries[pix_fmt].is_supported_in : 0;
212 }
213 
214 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
215 {
216  return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
217  format_entries[pix_fmt].is_supported_out : 0;
218 }
219 
220 int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
221 {
222  return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
223  format_entries[pix_fmt].is_supported_endianness : 0;
224 }
225 
226 extern const int32_t ff_yuv2rgb_coeffs[8][4];
227 
228 #if FF_API_SWS_FORMAT_NAME
229 const char *sws_format_name(enum AVPixelFormat format)
230 {
231  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
232  if (desc)
233  return desc->name;
234  else
235  return "Unknown format";
236 }
237 #endif
238 
239 static double getSplineCoeff(double a, double b, double c, double d,
240  double dist)
241 {
242  if (dist <= 1.0)
243  return ((d * dist + c) * dist + b) * dist + a;
244  else
245  return getSplineCoeff(0.0,
246  b + 2.0 * c + 3.0 * d,
247  c + 3.0 * d,
248  -b - 3.0 * c - 6.0 * d,
249  dist - 1.0);
250 }
251 
252 static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
253  int *outFilterSize, int xInc, int srcW,
254  int dstW, int filterAlign, int one,
255  int flags, int cpu_flags,
256  SwsVector *srcFilter, SwsVector *dstFilter,
257  double param[2])
258 {
259  int i;
260  int filterSize;
261  int filter2Size;
262  int minFilterSize;
263  int64_t *filter = NULL;
264  int64_t *filter2 = NULL;
265  const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
266  int ret = -1;
267 
268  emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
269 
270  // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
271  FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);
272 
273  if (FFABS(xInc - 0x10000) < 10) { // unscaled
274  int i;
275  filterSize = 1;
276  FF_ALLOCZ_OR_GOTO(NULL, filter,
277  dstW * sizeof(*filter) * filterSize, fail);
278 
279  for (i = 0; i < dstW; i++) {
280  filter[i * filterSize] = fone;
281  (*filterPos)[i] = i;
282  }
283  } else if (flags & SWS_POINT) { // lame looking point sampling mode
284  int i;
285  int64_t xDstInSrc;
286  filterSize = 1;
287  FF_ALLOC_OR_GOTO(NULL, filter,
288  dstW * sizeof(*filter) * filterSize, fail);
289 
290  xDstInSrc = xInc / 2 - 0x8000;
291  for (i = 0; i < dstW; i++) {
292  int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
293 
294  (*filterPos)[i] = xx;
295  filter[i] = fone;
296  xDstInSrc += xInc;
297  }
298  } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
299  (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
300  int i;
301  int64_t xDstInSrc;
302  filterSize = 2;
303  FF_ALLOC_OR_GOTO(NULL, filter,
304  dstW * sizeof(*filter) * filterSize, fail);
305 
306  xDstInSrc = xInc / 2 - 0x8000;
307  for (i = 0; i < dstW; i++) {
308  int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
309  int j;
310 
311  (*filterPos)[i] = xx;
312  // bilinear upscale / linear interpolate / area averaging
313  for (j = 0; j < filterSize; j++) {
314  int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
315  if (coeff < 0)
316  coeff = 0;
317  filter[i * filterSize + j] = coeff;
318  xx++;
319  }
320  xDstInSrc += xInc;
321  }
322  } else {
323  int64_t xDstInSrc;
324  int sizeFactor;
325 
326  if (flags & SWS_BICUBIC)
327  sizeFactor = 4;
328  else if (flags & SWS_X)
329  sizeFactor = 8;
330  else if (flags & SWS_AREA)
331  sizeFactor = 1; // downscale only, for upscale it is bilinear
332  else if (flags & SWS_GAUSS)
333  sizeFactor = 8; // infinite ;)
334  else if (flags & SWS_LANCZOS)
335  sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
336  else if (flags & SWS_SINC)
337  sizeFactor = 20; // infinite ;)
338  else if (flags & SWS_SPLINE)
339  sizeFactor = 20; // infinite ;)
340  else if (flags & SWS_BILINEAR)
341  sizeFactor = 2;
342  else {
343  av_assert0(0);
344  }
345 
346  if (xInc <= 1 << 16)
347  filterSize = 1 + sizeFactor; // upscale
348  else
349  filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;
350 
351  filterSize = FFMIN(filterSize, srcW - 2);
352  filterSize = FFMAX(filterSize, 1);
353 
354  FF_ALLOC_OR_GOTO(NULL, filter,
355  dstW * sizeof(*filter) * filterSize, fail);
356 
357  xDstInSrc = xInc - 0x10000;
358  for (i = 0; i < dstW; i++) {
359  int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);
360  int j;
361  (*filterPos)[i] = xx;
362  for (j = 0; j < filterSize; j++) {
363  int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;
364  double floatd;
365  int64_t coeff;
366 
367  if (xInc > 1 << 16)
368  d = d * dstW / srcW;
369  floatd = d * (1.0 / (1 << 30));
370 
371  if (flags & SWS_BICUBIC) {
372  int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] : 0) * (1 << 24);
373  int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);
374 
375  if (d >= 1LL << 31) {
376  coeff = 0.0;
377  } else {
378  int64_t dd = (d * d) >> 30;
379  int64_t ddd = (dd * d) >> 30;
380 
381  if (d < 1LL << 30)
382  coeff = (12 * (1 << 24) - 9 * B - 6 * C) * ddd +
383  (-18 * (1 << 24) + 12 * B + 6 * C) * dd +
384  (6 * (1 << 24) - 2 * B) * (1 << 30);
385  else
386  coeff = (-B - 6 * C) * ddd +
387  (6 * B + 30 * C) * dd +
388  (-12 * B - 48 * C) * d +
389  (8 * B + 24 * C) * (1 << 30);
390  }
391  coeff /= (1LL<<54)/fone;
392  }
393 #if 0
394  else if (flags & SWS_X) {
395  double p = param ? param * 0.01 : 0.3;
396  coeff = d ? sin(d * M_PI) / (d * M_PI) : 1.0;
397  coeff *= pow(2.0, -p * d * d);
398  }
399 #endif
400  else if (flags & SWS_X) {
401  double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
402  double c;
403 
404  if (floatd < 1.0)
405  c = cos(floatd * M_PI);
406  else
407  c = -1.0;
408  if (c < 0.0)
409  c = -pow(-c, A);
410  else
411  c = pow(c, A);
412  coeff = (c * 0.5 + 0.5) * fone;
413  } else if (flags & SWS_AREA) {
414  int64_t d2 = d - (1 << 29);
415  if (d2 * xInc < -(1LL << (29 + 16)))
416  coeff = 1.0 * (1LL << (30 + 16));
417  else if (d2 * xInc < (1LL << (29 + 16)))
418  coeff = -d2 * xInc + (1LL << (29 + 16));
419  else
420  coeff = 0.0;
421  coeff *= fone >> (30 + 16);
422  } else if (flags & SWS_GAUSS) {
423  double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
424  coeff = (pow(2.0, -p * floatd * floatd)) * fone;
425  } else if (flags & SWS_SINC) {
426  coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
427  } else if (flags & SWS_LANCZOS) {
428  double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
429  coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
430  (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
431  if (floatd > p)
432  coeff = 0;
433  } else if (flags & SWS_BILINEAR) {
434  coeff = (1 << 30) - d;
435  if (coeff < 0)
436  coeff = 0;
437  coeff *= fone >> 30;
438  } else if (flags & SWS_SPLINE) {
439  double p = -2.196152422706632;
440  coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
441  } else {
442  av_assert0(0);
443  }
444 
445  filter[i * filterSize + j] = coeff;
446  xx++;
447  }
448  xDstInSrc += 2 * xInc;
449  }
450  }
451 
452  /* apply src & dst Filter to filter -> filter2
453  * av_free(filter);
454  */
455  av_assert0(filterSize > 0);
456  filter2Size = filterSize;
457  if (srcFilter)
458  filter2Size += srcFilter->length - 1;
459  if (dstFilter)
460  filter2Size += dstFilter->length - 1;
461  av_assert0(filter2Size > 0);
462  FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);
463 
464  for (i = 0; i < dstW; i++) {
465  int j, k;
466 
467  if (srcFilter) {
468  for (k = 0; k < srcFilter->length; k++) {
469  for (j = 0; j < filterSize; j++)
470  filter2[i * filter2Size + k + j] +=
471  srcFilter->coeff[k] * filter[i * filterSize + j];
472  }
473  } else {
474  for (j = 0; j < filterSize; j++)
475  filter2[i * filter2Size + j] = filter[i * filterSize + j];
476  }
477  // FIXME dstFilter
478 
479  (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
480  }
481  av_freep(&filter);
482 
483  /* try to reduce the filter-size (step1 find size and shift left) */
484  // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
485  minFilterSize = 0;
486  for (i = dstW - 1; i >= 0; i--) {
487  int min = filter2Size;
488  int j;
489  int64_t cutOff = 0.0;
490 
491  /* get rid of near zero elements on the left by shifting left */
492  for (j = 0; j < filter2Size; j++) {
493  int k;
494  cutOff += FFABS(filter2[i * filter2Size]);
495 
496  if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
497  break;
498 
499  /* preserve monotonicity because the core can't handle the
500  * filter otherwise */
501  if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
502  break;
503 
504  // move filter coefficients left
505  for (k = 1; k < filter2Size; k++)
506  filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
507  filter2[i * filter2Size + k - 1] = 0;
508  (*filterPos)[i]++;
509  }
510 
511  cutOff = 0;
512  /* count near zeros on the right */
513  for (j = filter2Size - 1; j > 0; j--) {
514  cutOff += FFABS(filter2[i * filter2Size + j]);
515 
516  if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
517  break;
518  min--;
519  }
520 
521  if (min > minFilterSize)
522  minFilterSize = min;
523  }
524 
525  if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) {
526  // we can handle the special case 4, so we don't want to go the full 8
527  if (minFilterSize < 5)
528  filterAlign = 4;
529 
530  /* We really don't want to waste our time doing useless computation, so
531  * fall back on the scalar C code for very small filters.
532  * Vectorizing is worth it only if you have a decent-sized vector. */
533  if (minFilterSize < 3)
534  filterAlign = 1;
535  }
536 
537  if (INLINE_MMX(cpu_flags)) {
538  // special case for unscaled vertical filtering
539  if (minFilterSize == 1 && filterAlign == 2)
540  filterAlign = 1;
541  }
542 
543  av_assert0(minFilterSize > 0);
544  filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
545  av_assert0(filterSize > 0);
546  filter = av_malloc(filterSize * dstW * sizeof(*filter));
547  if (filterSize >= MAX_FILTER_SIZE * 16 /
548  ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {
549  av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreem scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);
550  goto fail;
551  }
552  *outFilterSize = filterSize;
553 
554  if (flags & SWS_PRINT_INFO)
555  av_log(NULL, AV_LOG_VERBOSE,
556  "SwScaler: reducing / aligning filtersize %d -> %d\n",
557  filter2Size, filterSize);
558  /* try to reduce the filter-size (step2 reduce it) */
559  for (i = 0; i < dstW; i++) {
560  int j;
561 
562  for (j = 0; j < filterSize; j++) {
563  if (j >= filter2Size)
564  filter[i * filterSize + j] = 0;
565  else
566  filter[i * filterSize + j] = filter2[i * filter2Size + j];
567  if ((flags & SWS_BITEXACT) && j >= minFilterSize)
568  filter[i * filterSize + j] = 0;
569  }
570  }
571 
572  // FIXME try to align filterPos if possible
573 
574  // fix borders
575  for (i = 0; i < dstW; i++) {
576  int j;
577  if ((*filterPos)[i] < 0) {
578  // move filter coefficients left to compensate for filterPos
579  for (j = 1; j < filterSize; j++) {
580  int left = FFMAX(j + (*filterPos)[i], 0);
581  filter[i * filterSize + left] += filter[i * filterSize + j];
582  filter[i * filterSize + j] = 0;
583  }
584  (*filterPos)[i]= 0;
585  }
586 
587  if ((*filterPos)[i] + filterSize > srcW) {
588  int shift = (*filterPos)[i] + filterSize - srcW;
589  // move filter coefficients right to compensate for filterPos
590  for (j = filterSize - 2; j >= 0; j--) {
591  int right = FFMIN(j + shift, filterSize - 1);
592  filter[i * filterSize + right] += filter[i * filterSize + j];
593  filter[i * filterSize + j] = 0;
594  }
595  (*filterPos)[i]= srcW - filterSize;
596  }
597  }
598 
599  // Note the +1 is for the MMX scaler which reads over the end
600  /* align at 16 for AltiVec (needed by hScale_altivec_real) */
601  FF_ALLOCZ_OR_GOTO(NULL, *outFilter,
602  *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);
603 
604  /* normalize & store in outFilter */
605  for (i = 0; i < dstW; i++) {
606  int j;
607  int64_t error = 0;
608  int64_t sum = 0;
609 
610  for (j = 0; j < filterSize; j++) {
611  sum += filter[i * filterSize + j];
612  }
613  sum = (sum + one / 2) / one;
614  for (j = 0; j < *outFilterSize; j++) {
615  int64_t v = filter[i * filterSize + j] + error;
616  int intV = ROUNDED_DIV(v, sum);
617  (*outFilter)[i * (*outFilterSize) + j] = intV;
618  error = v - intV * sum;
619  }
620  }
621 
622  (*filterPos)[dstW + 0] =
623  (*filterPos)[dstW + 1] =
624  (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
625  * read over the end */
626  for (i = 0; i < *outFilterSize; i++) {
627  int k = (dstW - 1) * (*outFilterSize) + i;
628  (*outFilter)[k + 1 * (*outFilterSize)] =
629  (*outFilter)[k + 2 * (*outFilterSize)] =
630  (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
631  }
632 
633  ret = 0;
634 
635 fail:
636  if(ret < 0)
637  av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");
638  av_free(filter);
639  av_free(filter2);
640  return ret;
641 }
642 
643 #if HAVE_MMXEXT_INLINE
644 static av_cold int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
645  int16_t *filter, int32_t *filterPos,
646  int numSplits)
647 {
648  uint8_t *fragmentA;
649  x86_reg imm8OfPShufW1A;
650  x86_reg imm8OfPShufW2A;
651  x86_reg fragmentLengthA;
652  uint8_t *fragmentB;
653  x86_reg imm8OfPShufW1B;
654  x86_reg imm8OfPShufW2B;
655  x86_reg fragmentLengthB;
656  int fragmentPos;
657 
658  int xpos, i;
659 
660  // create an optimized horizontal scaling routine
661  /* This scaler is made of runtime-generated MMXEXT code using specially tuned
662  * pshufw instructions. For every four output pixels, if four input pixels
663  * are enough for the fast bilinear scaling, then a chunk of fragmentB is
664  * used. If five input pixels are needed, then a chunk of fragmentA is used.
665  */
666 
667  // code fragment
668 
669  __asm__ volatile (
670  "jmp 9f \n\t"
671  // Begin
672  "0: \n\t"
673  "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
674  "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
675  "movd 1(%%"REG_c", %%"REG_S"), %%mm1 \n\t"
676  "punpcklbw %%mm7, %%mm1 \n\t"
677  "punpcklbw %%mm7, %%mm0 \n\t"
678  "pshufw $0xFF, %%mm1, %%mm1 \n\t"
679  "1: \n\t"
680  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
681  "2: \n\t"
682  "psubw %%mm1, %%mm0 \n\t"
683  "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
684  "pmullw %%mm3, %%mm0 \n\t"
685  "psllw $7, %%mm1 \n\t"
686  "paddw %%mm1, %%mm0 \n\t"
687 
688  "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
689 
690  "add $8, %%"REG_a" \n\t"
691  // End
692  "9: \n\t"
693  // "int $3 \n\t"
694  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
695  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
696  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
697  "dec %1 \n\t"
698  "dec %2 \n\t"
699  "sub %0, %1 \n\t"
700  "sub %0, %2 \n\t"
701  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
702  "sub %0, %3 \n\t"
703 
704 
705  : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
706  "=r" (fragmentLengthA)
707  );
708 
709  __asm__ volatile (
710  "jmp 9f \n\t"
711  // Begin
712  "0: \n\t"
713  "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
714  "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
715  "punpcklbw %%mm7, %%mm0 \n\t"
716  "pshufw $0xFF, %%mm0, %%mm1 \n\t"
717  "1: \n\t"
718  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
719  "2: \n\t"
720  "psubw %%mm1, %%mm0 \n\t"
721  "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
722  "pmullw %%mm3, %%mm0 \n\t"
723  "psllw $7, %%mm1 \n\t"
724  "paddw %%mm1, %%mm0 \n\t"
725 
726  "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
727 
728  "add $8, %%"REG_a" \n\t"
729  // End
730  "9: \n\t"
731  // "int $3 \n\t"
732  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
733  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
734  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
735  "dec %1 \n\t"
736  "dec %2 \n\t"
737  "sub %0, %1 \n\t"
738  "sub %0, %2 \n\t"
739  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
740  "sub %0, %3 \n\t"
741 
742 
743  : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
744  "=r" (fragmentLengthB)
745  );
746 
747  xpos = 0; // lumXInc/2 - 0x8000; // difference between pixel centers
748  fragmentPos = 0;
749 
750  for (i = 0; i < dstW / numSplits; i++) {
751  int xx = xpos >> 16;
752 
753  if ((i & 3) == 0) {
754  int a = 0;
755  int b = ((xpos + xInc) >> 16) - xx;
756  int c = ((xpos + xInc * 2) >> 16) - xx;
757  int d = ((xpos + xInc * 3) >> 16) - xx;
758  int inc = (d + 1 < 4);
759  uint8_t *fragment = (d + 1 < 4) ? fragmentB : fragmentA;
760  x86_reg imm8OfPShufW1 = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;
761  x86_reg imm8OfPShufW2 = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;
762  x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;
763  int maxShift = 3 - (d + inc);
764  int shift = 0;
765 
766  if (filterCode) {
767  filter[i] = ((xpos & 0xFFFF) ^ 0xFFFF) >> 9;
768  filter[i + 1] = (((xpos + xInc) & 0xFFFF) ^ 0xFFFF) >> 9;
769  filter[i + 2] = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;
770  filter[i + 3] = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;
771  filterPos[i / 2] = xx;
772 
773  memcpy(filterCode + fragmentPos, fragment, fragmentLength);
774 
775  filterCode[fragmentPos + imm8OfPShufW1] = (a + inc) |
776  ((b + inc) << 2) |
777  ((c + inc) << 4) |
778  ((d + inc) << 6);
779  filterCode[fragmentPos + imm8OfPShufW2] = a | (b << 2) |
780  (c << 4) |
781  (d << 6);
782 
783  if (i + 4 - inc >= dstW)
784  shift = maxShift; // avoid overread
785  else if ((filterPos[i / 2] & 3) <= maxShift)
786  shift = filterPos[i / 2] & 3; // align
787 
788  if (shift && i >= shift) {
789  filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;
790  filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;
791  filterPos[i / 2] -= shift;
792  }
793  }
794 
795  fragmentPos += fragmentLength;
796 
797  if (filterCode)
798  filterCode[fragmentPos] = RET;
799  }
800  xpos += xInc;
801  }
802  if (filterCode)
803  filterPos[((i / 2) + 1) & (~1)] = xpos >> 16; // needed to jump to the next part
804 
805  return fragmentPos + 1;
806 }
807 #endif /* HAVE_MMXEXT_INLINE */
808 
809 static void getSubSampleFactors(int *h, int *v, enum AVPixelFormat format)
810 {
811  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
812  *h = desc->log2_chroma_w;
813  *v = desc->log2_chroma_h;
814 }
815 
816 static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
817 {
818  int64_t W, V, Z, Cy, Cu, Cv;
819  int64_t vr = table[0];
820  int64_t ub = table[1];
821  int64_t ug = -table[2];
822  int64_t vg = -table[3];
823  int64_t ONE = 65536;
824  int64_t cy = ONE;
825  uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
826  int i;
827  static const int8_t map[] = {
828  BY_IDX, GY_IDX, -1 , BY_IDX, BY_IDX, GY_IDX, -1 , BY_IDX,
829  RY_IDX, -1 , GY_IDX, RY_IDX, RY_IDX, -1 , GY_IDX, RY_IDX,
830  RY_IDX, GY_IDX, -1 , RY_IDX, RY_IDX, GY_IDX, -1 , RY_IDX,
831  BY_IDX, -1 , GY_IDX, BY_IDX, BY_IDX, -1 , GY_IDX, BY_IDX,
832  BU_IDX, GU_IDX, -1 , BU_IDX, BU_IDX, GU_IDX, -1 , BU_IDX,
833  RU_IDX, -1 , GU_IDX, RU_IDX, RU_IDX, -1 , GU_IDX, RU_IDX,
834  RU_IDX, GU_IDX, -1 , RU_IDX, RU_IDX, GU_IDX, -1 , RU_IDX,
835  BU_IDX, -1 , GU_IDX, BU_IDX, BU_IDX, -1 , GU_IDX, BU_IDX,
836  BV_IDX, GV_IDX, -1 , BV_IDX, BV_IDX, GV_IDX, -1 , BV_IDX,
837  RV_IDX, -1 , GV_IDX, RV_IDX, RV_IDX, -1 , GV_IDX, RV_IDX,
838  RV_IDX, GV_IDX, -1 , RV_IDX, RV_IDX, GV_IDX, -1 , RV_IDX,
839  BV_IDX, -1 , GV_IDX, BV_IDX, BV_IDX, -1 , GV_IDX, BV_IDX,
840  RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
841  BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
842  GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 ,
843  -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX,
844  RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
845  BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
846  GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 ,
847  -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX,
848  RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
849  BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
850  GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 ,
851  -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, //23
852  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //24
853  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //25
854  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //26
855  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //27
856  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //28
857  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //29
858  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //30
859  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //31
860  BY_IDX, GY_IDX, RY_IDX, -1 , -1 , -1 , -1 , -1 , //32
861  BU_IDX, GU_IDX, RU_IDX, -1 , -1 , -1 , -1 , -1 , //33
862  BV_IDX, GV_IDX, RV_IDX, -1 , -1 , -1 , -1 , -1 , //34
863  };
864 
865  dstRange = 0; //FIXME range = 1 is handled elsewhere
866 
867  if (!dstRange) {
868  cy = cy * 255 / 219;
869  } else {
870  vr = vr * 224 / 255;
871  ub = ub * 224 / 255;
872  ug = ug * 224 / 255;
873  vg = vg * 224 / 255;
874  }
875  W = ROUNDED_DIV(ONE*ONE*ug, ub);
876  V = ROUNDED_DIV(ONE*ONE*vg, vr);
877  Z = ONE*ONE-W-V;
878 
879  Cy = ROUNDED_DIV(cy*Z, ONE);
880  Cu = ROUNDED_DIV(ub*Z, ONE);
881  Cv = ROUNDED_DIV(vr*Z, ONE);
882 
883  c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cy);
884  c->input_rgb2yuv_table[GY_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cy);
885  c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cy);
886 
887  c->input_rgb2yuv_table[RU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cu);
888  c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cu);
889  c->input_rgb2yuv_table[BU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W) , Cu);
890 
891  c->input_rgb2yuv_table[RV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z) , Cv);
892  c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cv);
893  c->input_rgb2yuv_table[BV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cv);
894 
895  if(/*!dstRange && */table == ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]) {
896  c->input_rgb2yuv_table[BY_IDX] = ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
897  c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
898  c->input_rgb2yuv_table[BU_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
899  c->input_rgb2yuv_table[GY_IDX] = ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
900  c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
901  c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
902  c->input_rgb2yuv_table[RY_IDX] = ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
903  c->input_rgb2yuv_table[RV_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
904  c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
905  }
906  for(i=0; i<FF_ARRAY_ELEMS(map); i++)
907  AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
908 }
909 
910 static void fill_xyztables(struct SwsContext *c)
911 {
912  int i;
913  double xyzgamma = XYZ_GAMMA;
914  double rgbgamma = 1.0 / RGB_GAMMA;
915  static const int16_t xyz2rgb_matrix[3][4] = {
916  {13270, -6295, -2041},
917  {-3969, 7682, 170},
918  { 228, -835, 4329} };
919  static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096];
920 
921  memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
922  c->xyzgamma = xyzgamma_tab;
923  c->rgbgamma = rgbgamma_tab;
924 
925  if (rgbgamma_tab[4095])
926  return;
927 
928  /* set gamma vectors */
929  for (i = 0; i < 4096; i++) {
930  xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
931  rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
932  }
933 }
934 
935 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
936  int srcRange, const int table[4], int dstRange,
937  int brightness, int contrast, int saturation)
938 {
939  const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);
940  const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);
941  memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
942  memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);
943 
944  if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
945  dstRange = 0;
946  if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
947  srcRange = 0;
948 
949  c->brightness = brightness;
950  c->contrast = contrast;
951  c->saturation = saturation;
952  c->srcRange = srcRange;
953  c->dstRange = dstRange;
954 
955  fill_xyztables(c);
956 
957  if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat)))
958  return -1;
959 
960  c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
961  c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
962 
963  if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
964  ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
965  contrast, saturation);
966  // FIXME factorize
967 
968  if (HAVE_ALTIVEC && av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)
969  ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,
970  contrast, saturation);
971  }
972 
973  fill_rgb2yuv_table(c, table, dstRange);
974 
975  return 0;
976 }
977 
978 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
979  int *srcRange, int **table, int *dstRange,
980  int *brightness, int *contrast, int *saturation)
981 {
982  if (!c || isYUV(c->dstFormat) || isGray(c->dstFormat))
983  return -1;
984 
985  *inv_table = c->srcColorspaceTable;
986  *table = c->dstColorspaceTable;
987  *srcRange = c->srcRange;
988  *dstRange = c->dstRange;
989  *brightness = c->brightness;
990  *contrast = c->contrast;
991  *saturation = c->saturation;
992 
993  return 0;
994 }
995 
996 static int handle_jpeg(enum AVPixelFormat *format)
997 {
998  switch (*format) {
999  case AV_PIX_FMT_YUVJ420P:
1000  *format = AV_PIX_FMT_YUV420P;
1001  return 1;
1002  case AV_PIX_FMT_YUVJ422P:
1003  *format = AV_PIX_FMT_YUV422P;
1004  return 1;
1005  case AV_PIX_FMT_YUVJ444P:
1006  *format = AV_PIX_FMT_YUV444P;
1007  return 1;
1008  case AV_PIX_FMT_YUVJ440P:
1009  *format = AV_PIX_FMT_YUV440P;
1010  return 1;
1011  default:
1012  return 0;
1013  }
1014 }
1015 
1016 static int handle_0alpha(enum AVPixelFormat *format)
1017 {
1018  switch (*format) {
1019  case AV_PIX_FMT_0BGR : *format = AV_PIX_FMT_ABGR ; return 1;
1020  case AV_PIX_FMT_BGR0 : *format = AV_PIX_FMT_BGRA ; return 4;
1021  case AV_PIX_FMT_0RGB : *format = AV_PIX_FMT_ARGB ; return 1;
1022  case AV_PIX_FMT_RGB0 : *format = AV_PIX_FMT_RGBA ; return 4;
1023  default: return 0;
1024  }
1025 }
1026 
1027 static int handle_xyz(enum AVPixelFormat *format)
1028 {
1029  switch (*format) {
1030  case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;
1031  case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;
1032  default: return 0;
1033  }
1034 }
1035 
1036 SwsContext *sws_alloc_context(void)
1037 {
1038  SwsContext *c = av_mallocz(sizeof(SwsContext));
1039 
1040  if (c) {
1041  c->av_class = &sws_context_class;
1042  av_opt_set_defaults(c);
1043  }
1044 
1045  return c;
1046 }
1047 
1048 av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
1049  SwsFilter *dstFilter)
1050 {
1051  int i, j;
1052  int usesVFilter, usesHFilter;
1053  int unscaled;
1054  SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };
1055  int srcW = c->srcW;
1056  int srcH = c->srcH;
1057  int dstW = c->dstW;
1058  int dstH = c->dstH;
1059  int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 66, 16);
1060  int flags, cpu_flags;
1061  enum AVPixelFormat srcFormat = c->srcFormat;
1062  enum AVPixelFormat dstFormat = c->dstFormat;
1063  const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);
1064  const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);
1065 
1066  cpu_flags = av_get_cpu_flags();
1067  flags = c->flags;
1068  emms_c();
1069  if (!rgb15to16)
1070  sws_rgb2rgb_init();
1071 
1072  unscaled = (srcW == dstW && srcH == dstH);
1073 
1074  handle_jpeg(&srcFormat);
1075  handle_jpeg(&dstFormat);
1076  if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
1077  av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
1078  handle_0alpha(&srcFormat);
1079  handle_0alpha(&dstFormat);
1080  handle_xyz(&srcFormat);
1081  handle_xyz(&dstFormat);
1082 
1083  if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){
1084  c->srcFormat= srcFormat;
1085  c->dstFormat= dstFormat;
1086  }
1087 
1088  if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
1089  av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
1090  if (!sws_isSupportedInput(srcFormat)) {
1091  av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
1092  av_get_pix_fmt_name(srcFormat));
1093  return AVERROR(EINVAL);
1094  }
1095  if (!sws_isSupportedOutput(dstFormat)) {
1096  av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",
1097  av_get_pix_fmt_name(dstFormat));
1098  return AVERROR(EINVAL);
1099  }
1100  }
1101 
1102  i = flags & (SWS_POINT |
1103  SWS_AREA |
1104  SWS_BILINEAR |
1105  SWS_FAST_BILINEAR |
1106  SWS_BICUBIC |
1107  SWS_X |
1108  SWS_GAUSS |
1109  SWS_LANCZOS |
1110  SWS_SINC |
1111  SWS_SPLINE |
1112  SWS_BICUBLIN);
1113  if (!i || (i & (i - 1))) {
1114  av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen, got %X\n", i);
1115  return AVERROR(EINVAL);
1116  }
1117  /* sanity check */
1118  if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {
1119  /* FIXME check if these are enough and try to lower them after
1120  * fixing the relevant parts of the code */
1121  av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",
1122  srcW, srcH, dstW, dstH);
1123  return AVERROR(EINVAL);
1124  }
1125 
1126  if (!dstFilter)
1127  dstFilter = &dummyFilter;
1128  if (!srcFilter)
1129  srcFilter = &dummyFilter;
1130 
1131  c->lumXInc = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
1132  c->lumYInc = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;
1133  c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
1134  c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
1135  c->vRounder = 4 * 0x0001000100010001ULL;
1136 
1137  usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||
1138  (srcFilter->chrV && srcFilter->chrV->length > 1) ||
1139  (dstFilter->lumV && dstFilter->lumV->length > 1) ||
1140  (dstFilter->chrV && dstFilter->chrV->length > 1);
1141  usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||
1142  (srcFilter->chrH && srcFilter->chrH->length > 1) ||
1143  (dstFilter->lumH && dstFilter->lumH->length > 1) ||
1144  (dstFilter->chrH && dstFilter->chrH->length > 1);
1145 
1146  getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);
1147  getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);
1148 
1149  if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
1150  if (dstW&1) {
1151  av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
1152  flags |= SWS_FULL_CHR_H_INT;
1153  c->flags = flags;
1154  }
1155  }
1156 
1157  if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
1158  dstFormat == AV_PIX_FMT_RGB4_BYTE ||
1159  dstFormat == AV_PIX_FMT_BGR8 ||
1160  dstFormat == AV_PIX_FMT_RGB8) {
1161  if (flags & SWS_ERROR_DIFFUSION && !(flags & SWS_FULL_CHR_H_INT)) {
1162  av_log(c, AV_LOG_DEBUG,
1163  "Error diffusion dither is only supported in full chroma interpolation for destination format '%s'\n",
1164  av_get_pix_fmt_name(dstFormat));
1165  flags |= SWS_FULL_CHR_H_INT;
1166  c->flags = flags;
1167  }
1168  if (!(flags & SWS_ERROR_DIFFUSION) && (flags & SWS_FULL_CHR_H_INT)) {
1169  av_log(c, AV_LOG_DEBUG,
1170  "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
1171  av_get_pix_fmt_name(dstFormat));
1172  flags |= SWS_ERROR_DIFFUSION;
1173  c->flags = flags;
1174  }
1175  }
1176  if (isPlanarRGB(dstFormat)) {
1177  if (!(flags & SWS_FULL_CHR_H_INT)) {
1178  av_log(c, AV_LOG_DEBUG,
1179  "%s output is not supported with half chroma resolution, switching to full\n",
1180  av_get_pix_fmt_name(dstFormat));
1181  flags |= SWS_FULL_CHR_H_INT;
1182  c->flags = flags;
1183  }
1184  }
1185 
1186  /* reuse chroma for 2 pixels RGB/BGR unless user wants full
1187  * chroma interpolation */
1188  if (flags & SWS_FULL_CHR_H_INT &&
1189  isAnyRGB(dstFormat) &&
1190  !isPlanarRGB(dstFormat) &&
1191  dstFormat != AV_PIX_FMT_RGBA &&
1192  dstFormat != AV_PIX_FMT_ARGB &&
1193  dstFormat != AV_PIX_FMT_BGRA &&
1194  dstFormat != AV_PIX_FMT_ABGR &&
1195  dstFormat != AV_PIX_FMT_RGB24 &&
1196  dstFormat != AV_PIX_FMT_BGR24 &&
1197  dstFormat != AV_PIX_FMT_BGR4_BYTE &&
1198  dstFormat != AV_PIX_FMT_RGB4_BYTE &&
1199  dstFormat != AV_PIX_FMT_BGR8 &&
1200  dstFormat != AV_PIX_FMT_RGB8
1201  ) {
1202  av_log(c, AV_LOG_WARNING,
1203  "full chroma interpolation for destination format '%s' not yet implemented\n",
1204  av_get_pix_fmt_name(dstFormat));
1205  flags &= ~SWS_FULL_CHR_H_INT;
1206  c->flags = flags;
1207  }
1208  if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))
1209  c->chrDstHSubSample = 1;
1210 
1211  // drop some chroma lines if the user wants it
1212  c->vChrDrop = (flags & SWS_SRC_V_CHR_DROP_MASK) >>
1213  SWS_SRC_V_CHR_DROP_SHIFT;
1214  c->chrSrcVSubSample += c->vChrDrop;
1215 
1216  /* drop every other pixel for chroma calculation unless user
1217  * wants full chroma */
1218  if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP) &&
1219  srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
1220  srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
1221  srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&
1222  srcFormat != AV_PIX_FMT_GBRP9BE && srcFormat != AV_PIX_FMT_GBRP9LE &&
1223  srcFormat != AV_PIX_FMT_GBRP10BE && srcFormat != AV_PIX_FMT_GBRP10LE &&
1224  srcFormat != AV_PIX_FMT_GBRP12BE && srcFormat != AV_PIX_FMT_GBRP12LE &&
1225  srcFormat != AV_PIX_FMT_GBRP14BE && srcFormat != AV_PIX_FMT_GBRP14LE &&
1226  srcFormat != AV_PIX_FMT_GBRP16BE && srcFormat != AV_PIX_FMT_GBRP16LE &&
1227  ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
1228  (flags & SWS_FAST_BILINEAR)))
1229  c->chrSrcHSubSample = 1;
1230 
1231  // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.
1232  c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);
1233  c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);
1234  c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);
1235  c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);
1236 
1237  FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);
1238 
1239  /* unscaled special cases */
1240  if (unscaled && !usesHFilter && !usesVFilter &&
1241  (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {
1242  ff_get_unscaled_swscale(c);
1243 
1244  if (c->swScale) {
1245  if (flags & SWS_PRINT_INFO)
1246  av_log(c, AV_LOG_INFO,
1247  "using unscaled %s -> %s special converter\n",
1248  av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1249  return 0;
1250  }
1251  }
1252 
1253  c->srcBpc = 1 + desc_src->comp[0].depth_minus1;
1254  if (c->srcBpc < 8)
1255  c->srcBpc = 8;
1256  c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;
1257  if (c->dstBpc < 8)
1258  c->dstBpc = 8;
1259  if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)
1260  c->srcBpc = 16;
1261  if (c->dstBpc == 16)
1262  dst_stride <<= 1;
1263 
1264  if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
1265  c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&
1266  (srcW & 15) == 0) ? 1 : 0;
1267  if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0
1268 
1269  && (flags & SWS_FAST_BILINEAR)) {
1270  if (flags & SWS_PRINT_INFO)
1271  av_log(c, AV_LOG_INFO,
1272  "output width is not a multiple of 32 -> no MMXEXT scaler\n");
1273  }
1274  if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))
1275  c->canMMXEXTBeUsed = 0;
1276  } else
1277  c->canMMXEXTBeUsed = 0;
1278 
1279  c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
1280  c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;
1281 
1282  /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src
1283  * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do
1284  * correct scaling.
1285  * n-2 is the last chrominance sample available.
1286  * This is not perfect, but no one should notice the difference, the more
1287  * correct variant would be like the vertical one, but that would require
1288  * some special code for the first and last pixel */
1289  if (flags & SWS_FAST_BILINEAR) {
1290  if (c->canMMXEXTBeUsed) {
1291  c->lumXInc += 20;
1292  c->chrXInc += 20;
1293  }
1294  // we don't use the x86 asm scaler if MMX is available
1295  else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {
1296  c->lumXInc = ((int64_t)(srcW - 2) << 16) / (dstW - 2) - 20;
1297  c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;
1298  }
1299  }
1300 
1301 #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
1302 
1303  /* precalculate horizontal scaler filter coefficients */
1304  {
1305 #if HAVE_MMXEXT_INLINE
1306 // can't downscale !!!
1307  if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {
1308  c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,
1309  NULL, NULL, 8);
1310  c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,
1311  NULL, NULL, NULL, 4);
1312 
1313 #if USE_MMAP
1314  c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
1315  PROT_READ | PROT_WRITE,
1316  MAP_PRIVATE | MAP_ANONYMOUS,
1317  -1, 0);
1318  c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
1319  PROT_READ | PROT_WRITE,
1320  MAP_PRIVATE | MAP_ANONYMOUS,
1321  -1, 0);
1322 #elif HAVE_VIRTUALALLOC
1323  c->lumMmxextFilterCode = VirtualAlloc(NULL,
1324  c->lumMmxextFilterCodeSize,
1325  MEM_COMMIT,
1326  PAGE_EXECUTE_READWRITE);
1327  c->chrMmxextFilterCode = VirtualAlloc(NULL,
1328  c->chrMmxextFilterCodeSize,
1329  MEM_COMMIT,
1330  PAGE_EXECUTE_READWRITE);
1331 #else
1332  c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
1333  c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);
1334 #endif
1335 
1336 #ifdef MAP_ANONYMOUS
1337  if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)
1338 #else
1339  if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)
1340 #endif
1341  {
1342  av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");
1343  return AVERROR(ENOMEM);
1344  }
1345 
1346  FF_ALLOCZ_OR_GOTO(c, c->hLumFilter, (dstW / 8 + 8) * sizeof(int16_t), fail);
1347  FF_ALLOCZ_OR_GOTO(c, c->hChrFilter, (c->chrDstW / 4 + 8) * sizeof(int16_t), fail);
1348  FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW / 2 / 8 + 8) * sizeof(int32_t), fail);
1349  FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);
1350 
1351  init_hscaler_mmxext( dstW, c->lumXInc, c->lumMmxextFilterCode,
1352  c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
1353  init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
1354  c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
1355 
1356 #if USE_MMAP
1357  mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);
1358  mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);
1359 #endif
1360  } else
1361 #endif /* HAVE_MMXEXT_INLINE */
1362  {
1363  const int filterAlign =
1364  (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :
1365  (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :
1366  1;
1367 
1368  if (initFilter(&c->hLumFilter, &c->hLumFilterPos,
1369  &c->hLumFilterSize, c->lumXInc,
1370  srcW, dstW, filterAlign, 1 << 14,
1371  (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1372  cpu_flags, srcFilter->lumH, dstFilter->lumH,
1373  c->param) < 0)
1374  goto fail;
1375  if (initFilter(&c->hChrFilter, &c->hChrFilterPos,
1376  &c->hChrFilterSize, c->chrXInc,
1377  c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
1378  (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1379  cpu_flags, srcFilter->chrH, dstFilter->chrH,
1380  c->param) < 0)
1381  goto fail;
1382  }
1383  } // initialize horizontal stuff
1384 
1385  /* precalculate vertical scaler filter coefficients */
1386  {
1387  const int filterAlign =
1388  (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :
1389  (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :
1390  1;
1391 
1392  if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
1393  c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
1394  (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1395  cpu_flags, srcFilter->lumV, dstFilter->lumV,
1396  c->param) < 0)
1397  goto fail;
1398  if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
1399  c->chrYInc, c->chrSrcH, c->chrDstH,
1400  filterAlign, (1 << 12),
1401  (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1402  cpu_flags, srcFilter->chrV, dstFilter->chrV,
1403  c->param) < 0)
1404  goto fail;
1405 
1406 #if HAVE_ALTIVEC
1407  FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH, fail);
1408  FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);
1409 
1410  for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {
1411  int j;
1412  short *p = (short *)&c->vYCoeffsBank[i];
1413  for (j = 0; j < 8; j++)
1414  p[j] = c->vLumFilter[i];
1415  }
1416 
1417  for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {
1418  int j;
1419  short *p = (short *)&c->vCCoeffsBank[i];
1420  for (j = 0; j < 8; j++)
1421  p[j] = c->vChrFilter[i];
1422  }
1423 #endif
1424  }
1425 
1426  // calculate buffer sizes so that they won't run out while handling these damn slices
1427  c->vLumBufSize = c->vLumFilterSize;
1428  c->vChrBufSize = c->vChrFilterSize;
1429  for (i = 0; i < dstH; i++) {
1430  int chrI = (int64_t)i * c->chrDstH / dstH;
1431  int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,
1432  ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)
1433  << c->chrSrcVSubSample));
1434 
1435  nextSlice >>= c->chrSrcVSubSample;
1436  nextSlice <<= c->chrSrcVSubSample;
1437  if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)
1438  c->vLumBufSize = nextSlice - c->vLumFilterPos[i];
1439  if (c->vChrFilterPos[chrI] + c->vChrBufSize <
1440  (nextSlice >> c->chrSrcVSubSample))
1441  c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -
1442  c->vChrFilterPos[chrI];
1443  }
1444 
1445  for (i = 0; i < 4; i++)
1446  FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);
1447 
1448  /* Allocate pixbufs (we use dynamic allocation because otherwise we would
1449  * need to allocate several megabytes to handle all possible cases) */
1450  FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
1451  FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
1452  FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
1453  if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))
1454  FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
1455  /* Note we need at least one pixel more at the end because of the MMX code
1456  * (just in case someone wants to replace the 4000/8000). */
1457  /* align at 16 bytes for AltiVec */
1458  for (i = 0; i < c->vLumBufSize; i++) {
1459  FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],
1460  dst_stride + 16, fail);
1461  c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];
1462  }
1463  // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)
1464  c->uv_off = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);
1465  c->uv_offx2 = dst_stride + 16;
1466  for (i = 0; i < c->vChrBufSize; i++) {
1467  FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],
1468  dst_stride * 2 + 32, fail);
1469  c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];
1470  c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]
1471  = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;
1472  }
1473  if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)
1474  for (i = 0; i < c->vLumBufSize; i++) {
1475  FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],
1476  dst_stride + 16, fail);
1477  c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];
1478  }
1479 
1480  // try to avoid drawing green stuff between the right end and the stride end
1481  for (i = 0; i < c->vChrBufSize; i++)
1482  if(desc_dst->comp[0].depth_minus1 == 15){
1483  av_assert0(c->dstBpc > 14);
1484  for(j=0; j<dst_stride/2+1; j++)
1485  ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;
1486  } else
1487  for(j=0; j<dst_stride+1; j++)
1488  ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;
1489 
1490  av_assert0(c->chrDstH <= dstH);
1491 
1492  if (flags & SWS_PRINT_INFO) {
1493  if (flags & SWS_FAST_BILINEAR)
1494  av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");
1495  else if (flags & SWS_BILINEAR)
1496  av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");
1497  else if (flags & SWS_BICUBIC)
1498  av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");
1499  else if (flags & SWS_X)
1500  av_log(c, AV_LOG_INFO, "Experimental scaler, ");
1501  else if (flags & SWS_POINT)
1502  av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");
1503  else if (flags & SWS_AREA)
1504  av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");
1505  else if (flags & SWS_BICUBLIN)
1506  av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");
1507  else if (flags & SWS_GAUSS)
1508  av_log(c, AV_LOG_INFO, "Gaussian scaler, ");
1509  else if (flags & SWS_SINC)
1510  av_log(c, AV_LOG_INFO, "Sinc scaler, ");
1511  else if (flags & SWS_LANCZOS)
1512  av_log(c, AV_LOG_INFO, "Lanczos scaler, ");
1513  else if (flags & SWS_SPLINE)
1514  av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");
1515  else
1516  av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");
1517 
1518  av_log(c, AV_LOG_INFO, "from %s to %s%s ",
1519  av_get_pix_fmt_name(srcFormat),
1520 #ifdef DITHER1XBPP
1521  dstFormat == AV_PIX_FMT_BGR555 || dstFormat == AV_PIX_FMT_BGR565 ||
1522  dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
1523  dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?
1524  "dithered " : "",
1525 #else
1526  "",
1527 #endif
1528  av_get_pix_fmt_name(dstFormat));
1529 
1530  if (INLINE_MMXEXT(cpu_flags))
1531  av_log(c, AV_LOG_INFO, "using MMXEXT\n");
1532  else if (INLINE_AMD3DNOW(cpu_flags))
1533  av_log(c, AV_LOG_INFO, "using 3DNOW\n");
1534  else if (INLINE_MMX(cpu_flags))
1535  av_log(c, AV_LOG_INFO, "using MMX\n");
1536  else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)
1537  av_log(c, AV_LOG_INFO, "using AltiVec\n");
1538  else
1539  av_log(c, AV_LOG_INFO, "using C\n");
1540 
1541  av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);
1542  av_log(c, AV_LOG_DEBUG,
1543  "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1544  c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);
1545  av_log(c, AV_LOG_DEBUG,
1546  "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1547  c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,
1548  c->chrXInc, c->chrYInc);
1549  }
1550 
1551  c->swScale = ff_getSwsFunc(c);
1552  return 0;
1553 fail: // FIXME replace things by appropriate error codes
1554  return -1;
1555 }
1556 
1557 #if FF_API_SWS_GETCONTEXT
1558 SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
1559  int dstW, int dstH, enum AVPixelFormat dstFormat,
1560  int flags, SwsFilter *srcFilter,
1561  SwsFilter *dstFilter, const double *param)
1562 {
1563  SwsContext *c;
1564 
1565  if (!(c = sws_alloc_context()))
1566  return NULL;
1567 
1568  c->flags = flags;
1569  c->srcW = srcW;
1570  c->srcH = srcH;
1571  c->dstW = dstW;
1572  c->dstH = dstH;
1573  c->srcRange = handle_jpeg(&srcFormat);
1574  c->dstRange = handle_jpeg(&dstFormat);
1575  c->src0Alpha = handle_0alpha(&srcFormat);
1576  c->dst0Alpha = handle_0alpha(&dstFormat);
1577  c->srcXYZ = handle_xyz(&srcFormat);
1578  c->dstXYZ = handle_xyz(&dstFormat);
1579  c->srcFormat = srcFormat;
1580  c->dstFormat = dstFormat;
1581 
1582  if (param) {
1583  c->param[0] = param[0];
1584  c->param[1] = param[1];
1585  }
1586  sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
1587  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,
1588  c->dstRange, 0, 1 << 16, 1 << 16);
1589 
1590  if (sws_init_context(c, srcFilter, dstFilter) < 0) {
1591  sws_freeContext(c);
1592  return NULL;
1593  }
1594 
1595  return c;
1596 }
1597 #endif
1598 
1599 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
1600  float lumaSharpen, float chromaSharpen,
1601  float chromaHShift, float chromaVShift,
1602  int verbose)
1603 {
1604  SwsFilter *filter = av_malloc(sizeof(SwsFilter));
1605  if (!filter)
1606  return NULL;
1607 
1608  if (lumaGBlur != 0.0) {
1609  filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
1610  filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);
1611  } else {
1612  filter->lumH = sws_getIdentityVec();
1613  filter->lumV = sws_getIdentityVec();
1614  }
1615 
1616  if (chromaGBlur != 0.0) {
1617  filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
1618  filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);
1619  } else {
1620  filter->chrH = sws_getIdentityVec();
1621  filter->chrV = sws_getIdentityVec();
1622  }
1623 
1624  if (chromaSharpen != 0.0) {
1625  SwsVector *id = sws_getIdentityVec();
1626  sws_scaleVec(filter->chrH, -chromaSharpen);
1627  sws_scaleVec(filter->chrV, -chromaSharpen);
1628  sws_addVec(filter->chrH, id);
1629  sws_addVec(filter->chrV, id);
1630  sws_freeVec(id);
1631  }
1632 
1633  if (lumaSharpen != 0.0) {
1634  SwsVector *id = sws_getIdentityVec();
1635  sws_scaleVec(filter->lumH, -lumaSharpen);
1636  sws_scaleVec(filter->lumV, -lumaSharpen);
1637  sws_addVec(filter->lumH, id);
1638  sws_addVec(filter->lumV, id);
1639  sws_freeVec(id);
1640  }
1641 
1642  if (chromaHShift != 0.0)
1643  sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));
1644 
1645  if (chromaVShift != 0.0)
1646  sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));
1647 
1648  sws_normalizeVec(filter->chrH, 1.0);
1649  sws_normalizeVec(filter->chrV, 1.0);
1650  sws_normalizeVec(filter->lumH, 1.0);
1651  sws_normalizeVec(filter->lumV, 1.0);
1652 
1653  if (verbose)
1654  sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
1655  if (verbose)
1656  sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
1657 
1658  return filter;
1659 }
1660 
1661 SwsVector *sws_allocVec(int length)
1662 {
1663  SwsVector *vec;
1664 
1665  if(length <= 0 || length > INT_MAX/ sizeof(double))
1666  return NULL;
1667 
1668  vec = av_malloc(sizeof(SwsVector));
1669  if (!vec)
1670  return NULL;
1671  vec->length = length;
1672  vec->coeff = av_malloc(sizeof(double) * length);
1673  if (!vec->coeff)
1674  av_freep(&vec);
1675  return vec;
1676 }
1677 
1678 SwsVector *sws_getGaussianVec(double variance, double quality)
1679 {
1680  const int length = (int)(variance * quality + 0.5) | 1;
1681  int i;
1682  double middle = (length - 1) * 0.5;
1683  SwsVector *vec;
1684 
1685  if(variance < 0 || quality < 0)
1686  return NULL;
1687 
1688  vec = sws_allocVec(length);
1689 
1690  if (!vec)
1691  return NULL;
1692 
1693  for (i = 0; i < length; i++) {
1694  double dist = i - middle;
1695  vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
1696  sqrt(2 * variance * M_PI);
1697  }
1698 
1699  sws_normalizeVec(vec, 1.0);
1700 
1701  return vec;
1702 }
1703 
1704 SwsVector *sws_getConstVec(double c, int length)
1705 {
1706  int i;
1707  SwsVector *vec = sws_allocVec(length);
1708 
1709  if (!vec)
1710  return NULL;
1711 
1712  for (i = 0; i < length; i++)
1713  vec->coeff[i] = c;
1714 
1715  return vec;
1716 }
1717 
1718 SwsVector *sws_getIdentityVec(void)
1719 {
1720  return sws_getConstVec(1.0, 1);
1721 }
1722 
1723 static double sws_dcVec(SwsVector *a)
1724 {
1725  int i;
1726  double sum = 0;
1727 
1728  for (i = 0; i < a->length; i++)
1729  sum += a->coeff[i];
1730 
1731  return sum;
1732 }
1733 
1734 void sws_scaleVec(SwsVector *a, double scalar)
1735 {
1736  int i;
1737 
1738  for (i = 0; i < a->length; i++)
1739  a->coeff[i] *= scalar;
1740 }
1741 
1742 void sws_normalizeVec(SwsVector *a, double height)
1743 {
1744  sws_scaleVec(a, height / sws_dcVec(a));
1745 }
1746 
1747 static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
1748 {
1749  int length = a->length + b->length - 1;
1750  int i, j;
1751  SwsVector *vec = sws_getConstVec(0.0, length);
1752 
1753  if (!vec)
1754  return NULL;
1755 
1756  for (i = 0; i < a->length; i++) {
1757  for (j = 0; j < b->length; j++) {
1758  vec->coeff[i + j] += a->coeff[i] * b->coeff[j];
1759  }
1760  }
1761 
1762  return vec;
1763 }
1764 
1765 static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
1766 {
1767  int length = FFMAX(a->length, b->length);
1768  int i;
1769  SwsVector *vec = sws_getConstVec(0.0, length);
1770 
1771  if (!vec)
1772  return NULL;
1773 
1774  for (i = 0; i < a->length; i++)
1775  vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
1776  for (i = 0; i < b->length; i++)
1777  vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];
1778 
1779  return vec;
1780 }
1781 
1782 static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
1783 {
1784  int length = FFMAX(a->length, b->length);
1785  int i;
1786  SwsVector *vec = sws_getConstVec(0.0, length);
1787 
1788  if (!vec)
1789  return NULL;
1790 
1791  for (i = 0; i < a->length; i++)
1792  vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
1793  for (i = 0; i < b->length; i++)
1794  vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];
1795 
1796  return vec;
1797 }
1798 
1799 /* shift left / or right if "shift" is negative */
1800 static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
1801 {
1802  int length = a->length + FFABS(shift) * 2;
1803  int i;
1804  SwsVector *vec = sws_getConstVec(0.0, length);
1805 
1806  if (!vec)
1807  return NULL;
1808 
1809  for (i = 0; i < a->length; i++) {
1810  vec->coeff[i + (length - 1) / 2 -
1811  (a->length - 1) / 2 - shift] = a->coeff[i];
1812  }
1813 
1814  return vec;
1815 }
1816 
1817 void sws_shiftVec(SwsVector *a, int shift)
1818 {
1819  SwsVector *shifted = sws_getShiftedVec(a, shift);
1820  av_free(a->coeff);
1821  a->coeff = shifted->coeff;
1822  a->length = shifted->length;
1823  av_free(shifted);
1824 }
1825 
1826 void sws_addVec(SwsVector *a, SwsVector *b)
1827 {
1828  SwsVector *sum = sws_sumVec(a, b);
1829  av_free(a->coeff);
1830  a->coeff = sum->coeff;
1831  a->length = sum->length;
1832  av_free(sum);
1833 }
1834 
1835 void sws_subVec(SwsVector *a, SwsVector *b)
1836 {
1837  SwsVector *diff = sws_diffVec(a, b);
1838  av_free(a->coeff);
1839  a->coeff = diff->coeff;
1840  a->length = diff->length;
1841  av_free(diff);
1842 }
1843 
1844 void sws_convVec(SwsVector *a, SwsVector *b)
1845 {
1846  SwsVector *conv = sws_getConvVec(a, b);
1847  av_free(a->coeff);
1848  a->coeff = conv->coeff;
1849  a->length = conv->length;
1850  av_free(conv);
1851 }
1852 
1853 SwsVector *sws_cloneVec(SwsVector *a)
1854 {
1855  int i;
1856  SwsVector *vec = sws_allocVec(a->length);
1857 
1858  if (!vec)
1859  return NULL;
1860 
1861  for (i = 0; i < a->length; i++)
1862  vec->coeff[i] = a->coeff[i];
1863 
1864  return vec;
1865 }
1866 
1867 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
1868 {
1869  int i;
1870  double max = 0;
1871  double min = 0;
1872  double range;
1873 
1874  for (i = 0; i < a->length; i++)
1875  if (a->coeff[i] > max)
1876  max = a->coeff[i];
1877 
1878  for (i = 0; i < a->length; i++)
1879  if (a->coeff[i] < min)
1880  min = a->coeff[i];
1881 
1882  range = max - min;
1883 
1884  for (i = 0; i < a->length; i++) {
1885  int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);
1886  av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
1887  for (; x > 0; x--)
1888  av_log(log_ctx, log_level, " ");
1889  av_log(log_ctx, log_level, "|\n");
1890  }
1891 }
1892 
1893 void sws_freeVec(SwsVector *a)
1894 {
1895  if (!a)
1896  return;
1897  av_freep(&a->coeff);
1898  a->length = 0;
1899  av_free(a);
1900 }
1901 
1902 void sws_freeFilter(SwsFilter *filter)
1903 {
1904  if (!filter)
1905  return;
1906 
1907  if (filter->lumH)
1908  sws_freeVec(filter->lumH);
1909  if (filter->lumV)
1910  sws_freeVec(filter->lumV);
1911  if (filter->chrH)
1912  sws_freeVec(filter->chrH);
1913  if (filter->chrV)
1914  sws_freeVec(filter->chrV);
1915  av_free(filter);
1916 }
1917 
1918 void sws_freeContext(SwsContext *c)
1919 {
1920  int i;
1921  if (!c)
1922  return;
1923 
1924  if (c->lumPixBuf) {
1925  for (i = 0; i < c->vLumBufSize; i++)
1926  av_freep(&c->lumPixBuf[i]);
1927  av_freep(&c->lumPixBuf);
1928  }
1929 
1930  if (c->chrUPixBuf) {
1931  for (i = 0; i < c->vChrBufSize; i++)
1932  av_freep(&c->chrUPixBuf[i]);
1933  av_freep(&c->chrUPixBuf);
1934  av_freep(&c->chrVPixBuf);
1935  }
1936 
1937  if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {
1938  for (i = 0; i < c->vLumBufSize; i++)
1939  av_freep(&c->alpPixBuf[i]);
1940  av_freep(&c->alpPixBuf);
1941  }
1942 
1943  for (i = 0; i < 4; i++)
1944  av_freep(&c->dither_error[i]);
1945 
1946  av_freep(&c->vLumFilter);
1947  av_freep(&c->vChrFilter);
1948  av_freep(&c->hLumFilter);
1949  av_freep(&c->hChrFilter);
1950 #if HAVE_ALTIVEC
1951  av_freep(&c->vYCoeffsBank);
1952  av_freep(&c->vCCoeffsBank);
1953 #endif
1954 
1955  av_freep(&c->vLumFilterPos);
1956  av_freep(&c->vChrFilterPos);
1957  av_freep(&c->hLumFilterPos);
1958  av_freep(&c->hChrFilterPos);
1959 
1960 #if HAVE_MMX_INLINE
1961 #if USE_MMAP
1962  if (c->lumMmxextFilterCode)
1963  munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
1964  if (c->chrMmxextFilterCode)
1965  munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);
1966 #elif HAVE_VIRTUALALLOC
1967  if (c->lumMmxextFilterCode)
1968  VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
1969  if (c->chrMmxextFilterCode)
1970  VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);
1971 #else
1972  av_free(c->lumMmxextFilterCode);
1973  av_free(c->chrMmxextFilterCode);
1974 #endif
1975  c->lumMmxextFilterCode = NULL;
1976  c->chrMmxextFilterCode = NULL;
1977 #endif /* HAVE_MMX_INLINE */
1978 
1979  av_freep(&c->yuvTable);
1980  av_freep(&c->formatConvBuffer);
1981 
1982  av_free(c);
1983 }
1984 
1985 struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,
1986  int srcH, enum AVPixelFormat srcFormat,
1987  int dstW, int dstH,
1988  enum AVPixelFormat dstFormat, int flags,
1989  SwsFilter *srcFilter,
1990  SwsFilter *dstFilter,
1991  const double *param)
1992 {
1993  static const double default_param[2] = { SWS_PARAM_DEFAULT,
1994  SWS_PARAM_DEFAULT };
1995 
1996  if (!param)
1997  param = default_param;
1998 
1999  if (context &&
2000  (context->srcW != srcW ||
2001  context->srcH != srcH ||
2002  context->srcFormat != srcFormat ||
2003  context->dstW != dstW ||
2004  context->dstH != dstH ||
2005  context->dstFormat != dstFormat ||
2006  context->flags != flags ||
2007  context->param[0] != param[0] ||
2008  context->param[1] != param[1])) {
2009  sws_freeContext(context);
2010  context = NULL;
2011  }
2012 
2013  if (!context) {
2014  if (!(context = sws_alloc_context()))
2015  return NULL;
2016  context->srcW = srcW;
2017  context->srcH = srcH;
2018  context->srcRange = handle_jpeg(&srcFormat);
2019  context->src0Alpha = handle_0alpha(&srcFormat);
2020  context->srcXYZ = handle_xyz(&srcFormat);
2021  context->srcFormat = srcFormat;
2022  context->dstW = dstW;
2023  context->dstH = dstH;
2024  context->dstRange = handle_jpeg(&dstFormat);
2025  context->dst0Alpha = handle_0alpha(&dstFormat);
2026  context->dstXYZ = handle_xyz(&dstFormat);
2027  context->dstFormat = dstFormat;
2028  context->flags = flags;
2029  context->param[0] = param[0];
2030  context->param[1] = param[1];
2031  sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
2032  context->srcRange,
2033  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,
2034  context->dstRange, 0, 1 << 16, 1 << 16);
2035  if (sws_init_context(context, srcFilter, dstFilter) < 0) {
2036  sws_freeContext(context);
2037  return NULL;
2038  }
2039  }
2040  return context;
2041 }
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