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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/ppc/cpu.h"
50 #include "libavutil/x86/asm.h"
51 #include "libavutil/x86/cpu.h"
52 #include "rgb2rgb.h"
53 #include "swscale.h"
54 #include "swscale_internal.h"
55 
56 static void handle_formats(SwsContext *c);
57 
58 unsigned swscale_version(void)
59 {
60  av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);
61  return LIBSWSCALE_VERSION_INT;
62 }
63 
64 const char *swscale_configuration(void)
65 {
66  return FFMPEG_CONFIGURATION;
67 }
68 
69 const char *swscale_license(void)
70 {
71 #define LICENSE_PREFIX "libswscale license: "
72  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
73 }
74 
75 #define RET 0xC3 // near return opcode for x86
76 
77 typedef struct FormatEntry {
78  uint8_t is_supported_in :1;
79  uint8_t is_supported_out :1;
80  uint8_t is_supported_endianness :1;
81 } FormatEntry;
82 
83 static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
84  [AV_PIX_FMT_YUV420P] = { 1, 1 },
85  [AV_PIX_FMT_YUYV422] = { 1, 1 },
86  [AV_PIX_FMT_RGB24] = { 1, 1 },
87  [AV_PIX_FMT_BGR24] = { 1, 1 },
88  [AV_PIX_FMT_YUV422P] = { 1, 1 },
89  [AV_PIX_FMT_YUV444P] = { 1, 1 },
90  [AV_PIX_FMT_YUV410P] = { 1, 1 },
91  [AV_PIX_FMT_YUV411P] = { 1, 1 },
92  [AV_PIX_FMT_GRAY8] = { 1, 1 },
93  [AV_PIX_FMT_MONOWHITE] = { 1, 1 },
94  [AV_PIX_FMT_MONOBLACK] = { 1, 1 },
95  [AV_PIX_FMT_PAL8] = { 1, 0 },
96  [AV_PIX_FMT_YUVJ420P] = { 1, 1 },
97  [AV_PIX_FMT_YUVJ411P] = { 1, 1 },
98  [AV_PIX_FMT_YUVJ422P] = { 1, 1 },
99  [AV_PIX_FMT_YUVJ444P] = { 1, 1 },
100  [AV_PIX_FMT_UYVY422] = { 1, 1 },
101  [AV_PIX_FMT_UYYVYY411] = { 0, 0 },
102  [AV_PIX_FMT_BGR8] = { 1, 1 },
103  [AV_PIX_FMT_BGR4] = { 0, 1 },
104  [AV_PIX_FMT_BGR4_BYTE] = { 1, 1 },
105  [AV_PIX_FMT_RGB8] = { 1, 1 },
106  [AV_PIX_FMT_RGB4] = { 0, 1 },
107  [AV_PIX_FMT_RGB4_BYTE] = { 1, 1 },
108  [AV_PIX_FMT_NV12] = { 1, 1 },
109  [AV_PIX_FMT_NV21] = { 1, 1 },
110  [AV_PIX_FMT_ARGB] = { 1, 1 },
111  [AV_PIX_FMT_RGBA] = { 1, 1 },
112  [AV_PIX_FMT_ABGR] = { 1, 1 },
113  [AV_PIX_FMT_BGRA] = { 1, 1 },
114  [AV_PIX_FMT_0RGB] = { 1, 1 },
115  [AV_PIX_FMT_RGB0] = { 1, 1 },
116  [AV_PIX_FMT_0BGR] = { 1, 1 },
117  [AV_PIX_FMT_BGR0] = { 1, 1 },
118  [AV_PIX_FMT_GRAY16BE] = { 1, 1 },
119  [AV_PIX_FMT_GRAY16LE] = { 1, 1 },
120  [AV_PIX_FMT_YUV440P] = { 1, 1 },
121  [AV_PIX_FMT_YUVJ440P] = { 1, 1 },
122  [AV_PIX_FMT_YUVA420P] = { 1, 1 },
123  [AV_PIX_FMT_YUVA422P] = { 1, 1 },
124  [AV_PIX_FMT_YUVA444P] = { 1, 1 },
125  [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
126  [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
127  [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
128  [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
129  [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
130  [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
131  [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
132  [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
133  [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
134  [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
135  [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
136  [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
137  [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
138  [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
139  [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
140  [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
141  [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
142  [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },
143  [AV_PIX_FMT_RGB48BE] = { 1, 1 },
144  [AV_PIX_FMT_RGB48LE] = { 1, 1 },
145  [AV_PIX_FMT_RGBA64BE] = { 1, 1 },
146  [AV_PIX_FMT_RGBA64LE] = { 1, 1 },
147  [AV_PIX_FMT_RGB565BE] = { 1, 1 },
148  [AV_PIX_FMT_RGB565LE] = { 1, 1 },
149  [AV_PIX_FMT_RGB555BE] = { 1, 1 },
150  [AV_PIX_FMT_RGB555LE] = { 1, 1 },
151  [AV_PIX_FMT_BGR565BE] = { 1, 1 },
152  [AV_PIX_FMT_BGR565LE] = { 1, 1 },
153  [AV_PIX_FMT_BGR555BE] = { 1, 1 },
154  [AV_PIX_FMT_BGR555LE] = { 1, 1 },
155  [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
156  [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
157  [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
158  [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
159  [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
160  [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
161  [AV_PIX_FMT_RGB444LE] = { 1, 1 },
162  [AV_PIX_FMT_RGB444BE] = { 1, 1 },
163  [AV_PIX_FMT_BGR444LE] = { 1, 1 },
164  [AV_PIX_FMT_BGR444BE] = { 1, 1 },
165  [AV_PIX_FMT_Y400A] = { 1, 0 },
166  [AV_PIX_FMT_BGR48BE] = { 1, 1 },
167  [AV_PIX_FMT_BGR48LE] = { 1, 1 },
168  [AV_PIX_FMT_BGRA64BE] = { 0, 0 },
169  [AV_PIX_FMT_BGRA64LE] = { 0, 0 },
170  [AV_PIX_FMT_YUV420P9BE] = { 1, 1 },
171  [AV_PIX_FMT_YUV420P9LE] = { 1, 1 },
172  [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
173  [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },
174  [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
175  [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
176  [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
177  [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },
178  [AV_PIX_FMT_YUV422P9BE] = { 1, 1 },
179  [AV_PIX_FMT_YUV422P9LE] = { 1, 1 },
180  [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
181  [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },
182  [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
183  [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
184  [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
185  [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },
186  [AV_PIX_FMT_YUV444P9BE] = { 1, 1 },
187  [AV_PIX_FMT_YUV444P9LE] = { 1, 1 },
188  [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
189  [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },
190  [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
191  [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
192  [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
193  [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },
194  [AV_PIX_FMT_GBRP] = { 1, 1 },
195  [AV_PIX_FMT_GBRP9LE] = { 1, 1 },
196  [AV_PIX_FMT_GBRP9BE] = { 1, 1 },
197  [AV_PIX_FMT_GBRP10LE] = { 1, 1 },
198  [AV_PIX_FMT_GBRP10BE] = { 1, 1 },
199  [AV_PIX_FMT_GBRP12LE] = { 1, 1 },
200  [AV_PIX_FMT_GBRP12BE] = { 1, 1 },
201  [AV_PIX_FMT_GBRP14LE] = { 1, 1 },
202  [AV_PIX_FMT_GBRP14BE] = { 1, 1 },
203  [AV_PIX_FMT_GBRP16LE] = { 1, 0 },
204  [AV_PIX_FMT_GBRP16BE] = { 1, 0 },
205  [AV_PIX_FMT_XYZ12BE] = { 1, 1, 1 },
206  [AV_PIX_FMT_XYZ12LE] = { 1, 1, 1 },
207  [AV_PIX_FMT_GBRAP] = { 1, 1 },
208  [AV_PIX_FMT_GBRAP16LE] = { 1, 0 },
209  [AV_PIX_FMT_GBRAP16BE] = { 1, 0 },
210 };
211 
212 int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
213 {
214  return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
215  format_entries[pix_fmt].is_supported_in : 0;
216 }
217 
218 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
219 {
220  return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
221  format_entries[pix_fmt].is_supported_out : 0;
222 }
223 
224 int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
225 {
226  return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
227  format_entries[pix_fmt].is_supported_endianness : 0;
228 }
229 
230 #if FF_API_SWS_FORMAT_NAME
231 const char *sws_format_name(enum AVPixelFormat format)
232 {
233  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
234  if (desc)
235  return desc->name;
236  else
237  return "Unknown format";
238 }
239 #endif
240 
241 static double getSplineCoeff(double a, double b, double c, double d,
242  double dist)
243 {
244  if (dist <= 1.0)
245  return ((d * dist + c) * dist + b) * dist + a;
246  else
247  return getSplineCoeff(0.0,
248  b + 2.0 * c + 3.0 * d,
249  c + 3.0 * d,
250  -b - 3.0 * c - 6.0 * d,
251  dist - 1.0);
252 }
253 
254 static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)
255 {
256  if (pos < 0) {
257  pos = (128 << chr_subsample) - 128;
258  }
259  pos += 128; // relative to ideal left edge
260  return pos >> chr_subsample;
261 }
262 
263 typedef struct {
264  int flag; ///< flag associated to the algorithm
265  const char *description; ///< human-readable description
266  int size_factor; ///< size factor used when initing the filters
267 } ScaleAlgorithm;
268 
269 static const ScaleAlgorithm scale_algorithms[] = {
270  { SWS_AREA, "area averaging", 1 /* downscale only, for upscale it is bilinear */ },
271  { SWS_BICUBIC, "bicubic", 4 },
272  { SWS_BICUBLIN, "luma bicubic / chroma bilinear", -1 },
273  { SWS_BILINEAR, "bilinear", 2 },
274  { SWS_FAST_BILINEAR, "fast bilinear", -1 },
275  { SWS_GAUSS, "Gaussian", 8 /* infinite ;) */ },
276  { SWS_LANCZOS, "Lanczos", -1 /* custom */ },
277  { SWS_POINT, "nearest neighbor / point", -1 },
278  { SWS_SINC, "sinc", 20 /* infinite ;) */ },
279  { SWS_SPLINE, "bicubic spline", 20 /* infinite :)*/ },
280  { SWS_X, "experimental", 8 },
281 };
282 
283 static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
284  int *outFilterSize, int xInc, int srcW,
285  int dstW, int filterAlign, int one,
286  int flags, int cpu_flags,
287  SwsVector *srcFilter, SwsVector *dstFilter,
288  double param[2], int srcPos, int dstPos)
289 {
290  int i;
291  int filterSize;
292  int filter2Size;
293  int minFilterSize;
294  int64_t *filter = NULL;
295  int64_t *filter2 = NULL;
296  const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
297  int ret = -1;
298 
299  emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
300 
301  // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
302  FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);
303 
304  if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
305  int i;
306  filterSize = 1;
307  FF_ALLOCZ_OR_GOTO(NULL, filter,
308  dstW * sizeof(*filter) * filterSize, fail);
309 
310  for (i = 0; i < dstW; i++) {
311  filter[i * filterSize] = fone;
312  (*filterPos)[i] = i;
313  }
314  } else if (flags & SWS_POINT) { // lame looking point sampling mode
315  int i;
316  int64_t xDstInSrc;
317  filterSize = 1;
318  FF_ALLOC_OR_GOTO(NULL, filter,
319  dstW * sizeof(*filter) * filterSize, fail);
320 
321  xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
322  for (i = 0; i < dstW; i++) {
323  int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
324 
325  (*filterPos)[i] = xx;
326  filter[i] = fone;
327  xDstInSrc += xInc;
328  }
329  } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
330  (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
331  int i;
332  int64_t xDstInSrc;
333  filterSize = 2;
334  FF_ALLOC_OR_GOTO(NULL, filter,
335  dstW * sizeof(*filter) * filterSize, fail);
336 
337  xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
338  for (i = 0; i < dstW; i++) {
339  int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
340  int j;
341 
342  (*filterPos)[i] = xx;
343  // bilinear upscale / linear interpolate / area averaging
344  for (j = 0; j < filterSize; j++) {
345  int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
346  if (coeff < 0)
347  coeff = 0;
348  filter[i * filterSize + j] = coeff;
349  xx++;
350  }
351  xDstInSrc += xInc;
352  }
353  } else {
354  int64_t xDstInSrc;
355  int sizeFactor = -1;
356 
357  for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
358  if (flags & scale_algorithms[i].flag) {
359  sizeFactor = scale_algorithms[i].size_factor;
360  break;
361  }
362  }
363  if (flags & SWS_LANCZOS)
364  sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
365  av_assert0(sizeFactor > 0);
366 
367  if (xInc <= 1 << 16)
368  filterSize = 1 + sizeFactor; // upscale
369  else
370  filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;
371 
372  filterSize = FFMIN(filterSize, srcW - 2);
373  filterSize = FFMAX(filterSize, 1);
374 
375  FF_ALLOC_OR_GOTO(NULL, filter,
376  dstW * sizeof(*filter) * filterSize, fail);
377 
378  xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);
379  for (i = 0; i < dstW; i++) {
380  int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);
381  int j;
382  (*filterPos)[i] = xx;
383  for (j = 0; j < filterSize; j++) {
384  int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;
385  double floatd;
386  int64_t coeff;
387 
388  if (xInc > 1 << 16)
389  d = d * dstW / srcW;
390  floatd = d * (1.0 / (1 << 30));
391 
392  if (flags & SWS_BICUBIC) {
393  int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] : 0) * (1 << 24);
394  int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);
395 
396  if (d >= 1LL << 31) {
397  coeff = 0.0;
398  } else {
399  int64_t dd = (d * d) >> 30;
400  int64_t ddd = (dd * d) >> 30;
401 
402  if (d < 1LL << 30)
403  coeff = (12 * (1 << 24) - 9 * B - 6 * C) * ddd +
404  (-18 * (1 << 24) + 12 * B + 6 * C) * dd +
405  (6 * (1 << 24) - 2 * B) * (1 << 30);
406  else
407  coeff = (-B - 6 * C) * ddd +
408  (6 * B + 30 * C) * dd +
409  (-12 * B - 48 * C) * d +
410  (8 * B + 24 * C) * (1 << 30);
411  }
412  coeff /= (1LL<<54)/fone;
413  }
414 #if 0
415  else if (flags & SWS_X) {
416  double p = param ? param * 0.01 : 0.3;
417  coeff = d ? sin(d * M_PI) / (d * M_PI) : 1.0;
418  coeff *= pow(2.0, -p * d * d);
419  }
420 #endif
421  else if (flags & SWS_X) {
422  double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
423  double c;
424 
425  if (floatd < 1.0)
426  c = cos(floatd * M_PI);
427  else
428  c = -1.0;
429  if (c < 0.0)
430  c = -pow(-c, A);
431  else
432  c = pow(c, A);
433  coeff = (c * 0.5 + 0.5) * fone;
434  } else if (flags & SWS_AREA) {
435  int64_t d2 = d - (1 << 29);
436  if (d2 * xInc < -(1LL << (29 + 16)))
437  coeff = 1.0 * (1LL << (30 + 16));
438  else if (d2 * xInc < (1LL << (29 + 16)))
439  coeff = -d2 * xInc + (1LL << (29 + 16));
440  else
441  coeff = 0.0;
442  coeff *= fone >> (30 + 16);
443  } else if (flags & SWS_GAUSS) {
444  double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
445  coeff = (pow(2.0, -p * floatd * floatd)) * fone;
446  } else if (flags & SWS_SINC) {
447  coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
448  } else if (flags & SWS_LANCZOS) {
449  double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
450  coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
451  (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
452  if (floatd > p)
453  coeff = 0;
454  } else if (flags & SWS_BILINEAR) {
455  coeff = (1 << 30) - d;
456  if (coeff < 0)
457  coeff = 0;
458  coeff *= fone >> 30;
459  } else if (flags & SWS_SPLINE) {
460  double p = -2.196152422706632;
461  coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
462  } else {
463  av_assert0(0);
464  }
465 
466  filter[i * filterSize + j] = coeff;
467  xx++;
468  }
469  xDstInSrc += 2 * xInc;
470  }
471  }
472 
473  /* apply src & dst Filter to filter -> filter2
474  * av_free(filter);
475  */
476  av_assert0(filterSize > 0);
477  filter2Size = filterSize;
478  if (srcFilter)
479  filter2Size += srcFilter->length - 1;
480  if (dstFilter)
481  filter2Size += dstFilter->length - 1;
482  av_assert0(filter2Size > 0);
483  FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);
484 
485  for (i = 0; i < dstW; i++) {
486  int j, k;
487 
488  if (srcFilter) {
489  for (k = 0; k < srcFilter->length; k++) {
490  for (j = 0; j < filterSize; j++)
491  filter2[i * filter2Size + k + j] +=
492  srcFilter->coeff[k] * filter[i * filterSize + j];
493  }
494  } else {
495  for (j = 0; j < filterSize; j++)
496  filter2[i * filter2Size + j] = filter[i * filterSize + j];
497  }
498  // FIXME dstFilter
499 
500  (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
501  }
502  av_freep(&filter);
503 
504  /* try to reduce the filter-size (step1 find size and shift left) */
505  // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
506  minFilterSize = 0;
507  for (i = dstW - 1; i >= 0; i--) {
508  int min = filter2Size;
509  int j;
510  int64_t cutOff = 0.0;
511 
512  /* get rid of near zero elements on the left by shifting left */
513  for (j = 0; j < filter2Size; j++) {
514  int k;
515  cutOff += FFABS(filter2[i * filter2Size]);
516 
517  if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
518  break;
519 
520  /* preserve monotonicity because the core can't handle the
521  * filter otherwise */
522  if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
523  break;
524 
525  // move filter coefficients left
526  for (k = 1; k < filter2Size; k++)
527  filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
528  filter2[i * filter2Size + k - 1] = 0;
529  (*filterPos)[i]++;
530  }
531 
532  cutOff = 0;
533  /* count near zeros on the right */
534  for (j = filter2Size - 1; j > 0; j--) {
535  cutOff += FFABS(filter2[i * filter2Size + j]);
536 
537  if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
538  break;
539  min--;
540  }
541 
542  if (min > minFilterSize)
543  minFilterSize = min;
544  }
545 
546  if (PPC_ALTIVEC(cpu_flags)) {
547  // we can handle the special case 4, so we don't want to go the full 8
548  if (minFilterSize < 5)
549  filterAlign = 4;
550 
551  /* We really don't want to waste our time doing useless computation, so
552  * fall back on the scalar C code for very small filters.
553  * Vectorizing is worth it only if you have a decent-sized vector. */
554  if (minFilterSize < 3)
555  filterAlign = 1;
556  }
557 
558  if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {
559  // special case for unscaled vertical filtering
560  if (minFilterSize == 1 && filterAlign == 2)
561  filterAlign = 1;
562  }
563 
564  av_assert0(minFilterSize > 0);
565  filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
566  av_assert0(filterSize > 0);
567  filter = av_malloc(filterSize * dstW * sizeof(*filter));
568  if (filterSize >= MAX_FILTER_SIZE * 16 /
569  ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {
570  av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreme scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);
571  goto fail;
572  }
573  *outFilterSize = filterSize;
574 
575  if (flags & SWS_PRINT_INFO)
576  av_log(NULL, AV_LOG_VERBOSE,
577  "SwScaler: reducing / aligning filtersize %d -> %d\n",
578  filter2Size, filterSize);
579  /* try to reduce the filter-size (step2 reduce it) */
580  for (i = 0; i < dstW; i++) {
581  int j;
582 
583  for (j = 0; j < filterSize; j++) {
584  if (j >= filter2Size)
585  filter[i * filterSize + j] = 0;
586  else
587  filter[i * filterSize + j] = filter2[i * filter2Size + j];
588  if ((flags & SWS_BITEXACT) && j >= minFilterSize)
589  filter[i * filterSize + j] = 0;
590  }
591  }
592 
593  // FIXME try to align filterPos if possible
594 
595  // fix borders
596  for (i = 0; i < dstW; i++) {
597  int j;
598  if ((*filterPos)[i] < 0) {
599  // move filter coefficients left to compensate for filterPos
600  for (j = 1; j < filterSize; j++) {
601  int left = FFMAX(j + (*filterPos)[i], 0);
602  filter[i * filterSize + left] += filter[i * filterSize + j];
603  filter[i * filterSize + j] = 0;
604  }
605  (*filterPos)[i]= 0;
606  }
607 
608  if ((*filterPos)[i] + filterSize > srcW) {
609  int shift = (*filterPos)[i] + filterSize - srcW;
610  // move filter coefficients right to compensate for filterPos
611  for (j = filterSize - 2; j >= 0; j--) {
612  int right = FFMIN(j + shift, filterSize - 1);
613  filter[i * filterSize + right] += filter[i * filterSize + j];
614  filter[i * filterSize + j] = 0;
615  }
616  (*filterPos)[i]= srcW - filterSize;
617  }
618  }
619 
620  // Note the +1 is for the MMX scaler which reads over the end
621  /* align at 16 for AltiVec (needed by hScale_altivec_real) */
622  FF_ALLOCZ_OR_GOTO(NULL, *outFilter,
623  *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);
624 
625  /* normalize & store in outFilter */
626  for (i = 0; i < dstW; i++) {
627  int j;
628  int64_t error = 0;
629  int64_t sum = 0;
630 
631  for (j = 0; j < filterSize; j++) {
632  sum += filter[i * filterSize + j];
633  }
634  sum = (sum + one / 2) / one;
635  if (!sum) {
636  av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");
637  sum = 1;
638  }
639  for (j = 0; j < *outFilterSize; j++) {
640  int64_t v = filter[i * filterSize + j] + error;
641  int intV = ROUNDED_DIV(v, sum);
642  (*outFilter)[i * (*outFilterSize) + j] = intV;
643  error = v - intV * sum;
644  }
645  }
646 
647  (*filterPos)[dstW + 0] =
648  (*filterPos)[dstW + 1] =
649  (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
650  * read over the end */
651  for (i = 0; i < *outFilterSize; i++) {
652  int k = (dstW - 1) * (*outFilterSize) + i;
653  (*outFilter)[k + 1 * (*outFilterSize)] =
654  (*outFilter)[k + 2 * (*outFilterSize)] =
655  (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
656  }
657 
658  ret = 0;
659 
660 fail:
661  if(ret < 0)
662  av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");
663  av_free(filter);
664  av_free(filter2);
665  return ret;
666 }
667 
668 #if HAVE_MMXEXT_INLINE
669 static av_cold int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
670  int16_t *filter, int32_t *filterPos,
671  int numSplits)
672 {
673  uint8_t *fragmentA;
674  x86_reg imm8OfPShufW1A;
675  x86_reg imm8OfPShufW2A;
676  x86_reg fragmentLengthA;
677  uint8_t *fragmentB;
678  x86_reg imm8OfPShufW1B;
679  x86_reg imm8OfPShufW2B;
680  x86_reg fragmentLengthB;
681  int fragmentPos;
682 
683  int xpos, i;
684 
685  // create an optimized horizontal scaling routine
686  /* This scaler is made of runtime-generated MMXEXT code using specially tuned
687  * pshufw instructions. For every four output pixels, if four input pixels
688  * are enough for the fast bilinear scaling, then a chunk of fragmentB is
689  * used. If five input pixels are needed, then a chunk of fragmentA is used.
690  */
691 
692  // code fragment
693 
694  __asm__ volatile (
695  "jmp 9f \n\t"
696  // Begin
697  "0: \n\t"
698  "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
699  "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
700  "movd 1(%%"REG_c", %%"REG_S"), %%mm1 \n\t"
701  "punpcklbw %%mm7, %%mm1 \n\t"
702  "punpcklbw %%mm7, %%mm0 \n\t"
703  "pshufw $0xFF, %%mm1, %%mm1 \n\t"
704  "1: \n\t"
705  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
706  "2: \n\t"
707  "psubw %%mm1, %%mm0 \n\t"
708  "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
709  "pmullw %%mm3, %%mm0 \n\t"
710  "psllw $7, %%mm1 \n\t"
711  "paddw %%mm1, %%mm0 \n\t"
712 
713  "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
714 
715  "add $8, %%"REG_a" \n\t"
716  // End
717  "9: \n\t"
718  // "int $3 \n\t"
719  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
720  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
721  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
722  "dec %1 \n\t"
723  "dec %2 \n\t"
724  "sub %0, %1 \n\t"
725  "sub %0, %2 \n\t"
726  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
727  "sub %0, %3 \n\t"
728 
729 
730  : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
731  "=r" (fragmentLengthA)
732  );
733 
734  __asm__ volatile (
735  "jmp 9f \n\t"
736  // Begin
737  "0: \n\t"
738  "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
739  "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
740  "punpcklbw %%mm7, %%mm0 \n\t"
741  "pshufw $0xFF, %%mm0, %%mm1 \n\t"
742  "1: \n\t"
743  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
744  "2: \n\t"
745  "psubw %%mm1, %%mm0 \n\t"
746  "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
747  "pmullw %%mm3, %%mm0 \n\t"
748  "psllw $7, %%mm1 \n\t"
749  "paddw %%mm1, %%mm0 \n\t"
750 
751  "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
752 
753  "add $8, %%"REG_a" \n\t"
754  // End
755  "9: \n\t"
756  // "int $3 \n\t"
757  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
758  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
759  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
760  "dec %1 \n\t"
761  "dec %2 \n\t"
762  "sub %0, %1 \n\t"
763  "sub %0, %2 \n\t"
764  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
765  "sub %0, %3 \n\t"
766 
767 
768  : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
769  "=r" (fragmentLengthB)
770  );
771 
772  xpos = 0; // lumXInc/2 - 0x8000; // difference between pixel centers
773  fragmentPos = 0;
774 
775  for (i = 0; i < dstW / numSplits; i++) {
776  int xx = xpos >> 16;
777 
778  if ((i & 3) == 0) {
779  int a = 0;
780  int b = ((xpos + xInc) >> 16) - xx;
781  int c = ((xpos + xInc * 2) >> 16) - xx;
782  int d = ((xpos + xInc * 3) >> 16) - xx;
783  int inc = (d + 1 < 4);
784  uint8_t *fragment = (d + 1 < 4) ? fragmentB : fragmentA;
785  x86_reg imm8OfPShufW1 = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;
786  x86_reg imm8OfPShufW2 = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;
787  x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;
788  int maxShift = 3 - (d + inc);
789  int shift = 0;
790 
791  if (filterCode) {
792  filter[i] = ((xpos & 0xFFFF) ^ 0xFFFF) >> 9;
793  filter[i + 1] = (((xpos + xInc) & 0xFFFF) ^ 0xFFFF) >> 9;
794  filter[i + 2] = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;
795  filter[i + 3] = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;
796  filterPos[i / 2] = xx;
797 
798  memcpy(filterCode + fragmentPos, fragment, fragmentLength);
799 
800  filterCode[fragmentPos + imm8OfPShufW1] = (a + inc) |
801  ((b + inc) << 2) |
802  ((c + inc) << 4) |
803  ((d + inc) << 6);
804  filterCode[fragmentPos + imm8OfPShufW2] = a | (b << 2) |
805  (c << 4) |
806  (d << 6);
807 
808  if (i + 4 - inc >= dstW)
809  shift = maxShift; // avoid overread
810  else if ((filterPos[i / 2] & 3) <= maxShift)
811  shift = filterPos[i / 2] & 3; // align
812 
813  if (shift && i >= shift) {
814  filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;
815  filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;
816  filterPos[i / 2] -= shift;
817  }
818  }
819 
820  fragmentPos += fragmentLength;
821 
822  if (filterCode)
823  filterCode[fragmentPos] = RET;
824  }
825  xpos += xInc;
826  }
827  if (filterCode)
828  filterPos[((i / 2) + 1) & (~1)] = xpos >> 16; // needed to jump to the next part
829 
830  return fragmentPos + 1;
831 }
832 #endif /* HAVE_MMXEXT_INLINE */
833 
834 static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
835 {
836  int64_t W, V, Z, Cy, Cu, Cv;
837  int64_t vr = table[0];
838  int64_t ub = table[1];
839  int64_t ug = -table[2];
840  int64_t vg = -table[3];
841  int64_t ONE = 65536;
842  int64_t cy = ONE;
843  uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
844  int i;
845  static const int8_t map[] = {
846  BY_IDX, GY_IDX, -1 , BY_IDX, BY_IDX, GY_IDX, -1 , BY_IDX,
847  RY_IDX, -1 , GY_IDX, RY_IDX, RY_IDX, -1 , GY_IDX, RY_IDX,
848  RY_IDX, GY_IDX, -1 , RY_IDX, RY_IDX, GY_IDX, -1 , RY_IDX,
849  BY_IDX, -1 , GY_IDX, BY_IDX, BY_IDX, -1 , GY_IDX, BY_IDX,
850  BU_IDX, GU_IDX, -1 , BU_IDX, BU_IDX, GU_IDX, -1 , BU_IDX,
851  RU_IDX, -1 , GU_IDX, RU_IDX, RU_IDX, -1 , GU_IDX, RU_IDX,
852  RU_IDX, GU_IDX, -1 , RU_IDX, RU_IDX, GU_IDX, -1 , RU_IDX,
853  BU_IDX, -1 , GU_IDX, BU_IDX, BU_IDX, -1 , GU_IDX, BU_IDX,
854  BV_IDX, GV_IDX, -1 , BV_IDX, BV_IDX, GV_IDX, -1 , BV_IDX,
855  RV_IDX, -1 , GV_IDX, RV_IDX, RV_IDX, -1 , GV_IDX, RV_IDX,
856  RV_IDX, GV_IDX, -1 , RV_IDX, RV_IDX, GV_IDX, -1 , RV_IDX,
857  BV_IDX, -1 , GV_IDX, BV_IDX, BV_IDX, -1 , GV_IDX, BV_IDX,
858  RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
859  BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
860  GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 ,
861  -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX,
862  RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
863  BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
864  GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 ,
865  -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX,
866  RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
867  BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
868  GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 ,
869  -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, //23
870  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //24
871  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //25
872  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //26
873  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //27
874  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //28
875  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //29
876  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //30
877  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //31
878  BY_IDX, GY_IDX, RY_IDX, -1 , -1 , -1 , -1 , -1 , //32
879  BU_IDX, GU_IDX, RU_IDX, -1 , -1 , -1 , -1 , -1 , //33
880  BV_IDX, GV_IDX, RV_IDX, -1 , -1 , -1 , -1 , -1 , //34
881  };
882 
883  dstRange = 0; //FIXME range = 1 is handled elsewhere
884 
885  if (!dstRange) {
886  cy = cy * 255 / 219;
887  } else {
888  vr = vr * 224 / 255;
889  ub = ub * 224 / 255;
890  ug = ug * 224 / 255;
891  vg = vg * 224 / 255;
892  }
893  W = ROUNDED_DIV(ONE*ONE*ug, ub);
894  V = ROUNDED_DIV(ONE*ONE*vg, vr);
895  Z = ONE*ONE-W-V;
896 
897  Cy = ROUNDED_DIV(cy*Z, ONE);
898  Cu = ROUNDED_DIV(ub*Z, ONE);
899  Cv = ROUNDED_DIV(vr*Z, ONE);
900 
901  c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cy);
902  c->input_rgb2yuv_table[GY_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cy);
903  c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cy);
904 
905  c->input_rgb2yuv_table[RU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cu);
906  c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cu);
907  c->input_rgb2yuv_table[BU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W) , Cu);
908 
909  c->input_rgb2yuv_table[RV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z) , Cv);
910  c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cv);
911  c->input_rgb2yuv_table[BV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cv);
912 
913  if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {
914  c->input_rgb2yuv_table[BY_IDX] = ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
915  c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
916  c->input_rgb2yuv_table[BU_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
917  c->input_rgb2yuv_table[GY_IDX] = ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
918  c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
919  c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
920  c->input_rgb2yuv_table[RY_IDX] = ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
921  c->input_rgb2yuv_table[RV_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
922  c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
923  }
924  for(i=0; i<FF_ARRAY_ELEMS(map); i++)
925  AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
926 }
927 
928 static void fill_xyztables(struct SwsContext *c)
929 {
930  int i;
931  double xyzgamma = XYZ_GAMMA;
932  double rgbgamma = 1.0 / RGB_GAMMA;
933  double xyzgammainv = 1.0 / XYZ_GAMMA;
934  double rgbgammainv = RGB_GAMMA;
935  static const int16_t xyz2rgb_matrix[3][4] = {
936  {13270, -6295, -2041},
937  {-3969, 7682, 170},
938  { 228, -835, 4329} };
939  static const int16_t rgb2xyz_matrix[3][4] = {
940  {1689, 1464, 739},
941  { 871, 2929, 296},
942  { 79, 488, 3891} };
943  static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];
944 
945  memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
946  memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
947  c->xyzgamma = xyzgamma_tab;
948  c->rgbgamma = rgbgamma_tab;
949  c->xyzgammainv = xyzgammainv_tab;
950  c->rgbgammainv = rgbgammainv_tab;
951 
952  if (rgbgamma_tab[4095])
953  return;
954 
955  /* set gamma vectors */
956  for (i = 0; i < 4096; i++) {
957  xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
958  rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
959  xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);
960  rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);
961  }
962 }
963 
964 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
965  int srcRange, const int table[4], int dstRange,
966  int brightness, int contrast, int saturation)
967 {
968  const AVPixFmtDescriptor *desc_dst;
969  const AVPixFmtDescriptor *desc_src;
970  memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
971  memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
972 
973  handle_formats(c);
974  desc_dst = av_pix_fmt_desc_get(c->dstFormat);
975  desc_src = av_pix_fmt_desc_get(c->srcFormat);
976 
977  if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
978  dstRange = 0;
979  if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
980  srcRange = 0;
981 
982  c->brightness = brightness;
983  c->contrast = contrast;
984  c->saturation = saturation;
985  c->srcRange = srcRange;
986  c->dstRange = dstRange;
987 
988  if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat)))
989  return -1;
990 
991  c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
992  c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
993 
994  if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
995  ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
996  contrast, saturation);
997  // FIXME factorize
998 
999  if (ARCH_PPC)
1000  ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,
1001  contrast, saturation);
1002  }
1003 
1004  fill_rgb2yuv_table(c, table, dstRange);
1005 
1006  return 0;
1007 }
1008 
1009 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
1010  int *srcRange, int **table, int *dstRange,
1011  int *brightness, int *contrast, int *saturation)
1012 {
1013  if (!c )
1014  return -1;
1015 
1016  *inv_table = c->srcColorspaceTable;
1017  *table = c->dstColorspaceTable;
1018  *srcRange = c->srcRange;
1019  *dstRange = c->dstRange;
1020  *brightness = c->brightness;
1021  *contrast = c->contrast;
1022  *saturation = c->saturation;
1023 
1024  return 0;
1025 }
1026 
1027 static int handle_jpeg(enum AVPixelFormat *format)
1028 {
1029  switch (*format) {
1030  case AV_PIX_FMT_YUVJ420P:
1031  *format = AV_PIX_FMT_YUV420P;
1032  return 1;
1033  case AV_PIX_FMT_YUVJ411P:
1034  *format = AV_PIX_FMT_YUV411P;
1035  return 1;
1036  case AV_PIX_FMT_YUVJ422P:
1037  *format = AV_PIX_FMT_YUV422P;
1038  return 1;
1039  case AV_PIX_FMT_YUVJ444P:
1040  *format = AV_PIX_FMT_YUV444P;
1041  return 1;
1042  case AV_PIX_FMT_YUVJ440P:
1043  *format = AV_PIX_FMT_YUV440P;
1044  return 1;
1045  case AV_PIX_FMT_GRAY8:
1046  return 1;
1047  default:
1048  return 0;
1049  }
1050 }
1051 
1052 static int handle_0alpha(enum AVPixelFormat *format)
1053 {
1054  switch (*format) {
1055  case AV_PIX_FMT_0BGR : *format = AV_PIX_FMT_ABGR ; return 1;
1056  case AV_PIX_FMT_BGR0 : *format = AV_PIX_FMT_BGRA ; return 4;
1057  case AV_PIX_FMT_0RGB : *format = AV_PIX_FMT_ARGB ; return 1;
1058  case AV_PIX_FMT_RGB0 : *format = AV_PIX_FMT_RGBA ; return 4;
1059  default: return 0;
1060  }
1061 }
1062 
1063 static int handle_xyz(enum AVPixelFormat *format)
1064 {
1065  switch (*format) {
1066  case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;
1067  case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;
1068  default: return 0;
1069  }
1070 }
1071 
1072 static void handle_formats(SwsContext *c)
1073 {
1074  c->src0Alpha |= handle_0alpha(&c->srcFormat);
1075  c->dst0Alpha |= handle_0alpha(&c->dstFormat);
1076  c->srcXYZ |= handle_xyz(&c->srcFormat);
1077  c->dstXYZ |= handle_xyz(&c->dstFormat);
1078  if (c->srcXYZ || c->dstXYZ)
1079  fill_xyztables(c);
1080 }
1081 
1082 SwsContext *sws_alloc_context(void)
1083 {
1084  SwsContext *c = av_mallocz(sizeof(SwsContext));
1085 
1086  if (c) {
1087  c->av_class = &sws_context_class;
1088  av_opt_set_defaults(c);
1089  }
1090 
1091  return c;
1092 }
1093 
1094 av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
1095  SwsFilter *dstFilter)
1096 {
1097  int i, j;
1098  int usesVFilter, usesHFilter;
1099  int unscaled;
1100  SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };
1101  int srcW = c->srcW;
1102  int srcH = c->srcH;
1103  int dstW = c->dstW;
1104  int dstH = c->dstH;
1105  int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 66, 16);
1106  int flags, cpu_flags;
1107  enum AVPixelFormat srcFormat = c->srcFormat;
1108  enum AVPixelFormat dstFormat = c->dstFormat;
1109  const AVPixFmtDescriptor *desc_src;
1110  const AVPixFmtDescriptor *desc_dst;
1111 
1112  cpu_flags = av_get_cpu_flags();
1113  flags = c->flags;
1114  emms_c();
1115  if (!rgb15to16)
1116  sws_rgb2rgb_init();
1117 
1118  unscaled = (srcW == dstW && srcH == dstH);
1119 
1120  c->srcRange |= handle_jpeg(&c->srcFormat);
1121  c->dstRange |= handle_jpeg(&c->dstFormat);
1122 
1123  if (!c->contrast && !c->saturation && !c->dstFormatBpp)
1124  sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
1125  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
1126  c->dstRange, 0, 1 << 16, 1 << 16);
1127 
1128  if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
1129  av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
1130  handle_formats(c);
1131  srcFormat = c->srcFormat;
1132  dstFormat = c->dstFormat;
1133  desc_src = av_pix_fmt_desc_get(srcFormat);
1134  desc_dst = av_pix_fmt_desc_get(dstFormat);
1135 
1136  if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
1137  av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
1138  if (!sws_isSupportedInput(srcFormat)) {
1139  av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
1140  av_get_pix_fmt_name(srcFormat));
1141  return AVERROR(EINVAL);
1142  }
1143  if (!sws_isSupportedOutput(dstFormat)) {
1144  av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",
1145  av_get_pix_fmt_name(dstFormat));
1146  return AVERROR(EINVAL);
1147  }
1148  }
1149 
1150  i = flags & (SWS_POINT |
1151  SWS_AREA |
1152  SWS_BILINEAR |
1153  SWS_FAST_BILINEAR |
1154  SWS_BICUBIC |
1155  SWS_X |
1156  SWS_GAUSS |
1157  SWS_LANCZOS |
1158  SWS_SINC |
1159  SWS_SPLINE |
1160  SWS_BICUBLIN);
1161 
1162  /* provide a default scaler if not set by caller */
1163  if (!i) {
1164  if (dstW < srcW && dstH < srcH)
1165  flags |= SWS_BICUBIC;
1166  else if (dstW > srcW && dstH > srcH)
1167  flags |= SWS_BICUBIC;
1168  else
1169  flags |= SWS_BICUBIC;
1170  c->flags = flags;
1171  } else if (i & (i - 1)) {
1172  av_log(c, AV_LOG_ERROR,
1173  "Exactly one scaler algorithm must be chosen, got %X\n", i);
1174  return AVERROR(EINVAL);
1175  }
1176  /* sanity check */
1177  if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {
1178  /* FIXME check if these are enough and try to lower them after
1179  * fixing the relevant parts of the code */
1180  av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",
1181  srcW, srcH, dstW, dstH);
1182  return AVERROR(EINVAL);
1183  }
1184 
1185  if (!dstFilter)
1186  dstFilter = &dummyFilter;
1187  if (!srcFilter)
1188  srcFilter = &dummyFilter;
1189 
1190  c->lumXInc = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
1191  c->lumYInc = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;
1192  c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
1193  c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
1194  c->vRounder = 4 * 0x0001000100010001ULL;
1195 
1196  usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||
1197  (srcFilter->chrV && srcFilter->chrV->length > 1) ||
1198  (dstFilter->lumV && dstFilter->lumV->length > 1) ||
1199  (dstFilter->chrV && dstFilter->chrV->length > 1);
1200  usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||
1201  (srcFilter->chrH && srcFilter->chrH->length > 1) ||
1202  (dstFilter->lumH && dstFilter->lumH->length > 1) ||
1203  (dstFilter->chrH && dstFilter->chrH->length > 1);
1204 
1205  av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);
1206  av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);
1207 
1208  if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
1209  if (dstW&1) {
1210  av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
1211  flags |= SWS_FULL_CHR_H_INT;
1212  c->flags = flags;
1213  }
1214 
1215  if ( c->chrSrcHSubSample == 0
1216  && c->chrSrcVSubSample == 0
1217  && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER
1218  && !(c->flags & SWS_FAST_BILINEAR)
1219  ) {
1220  av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");
1221  flags |= SWS_FULL_CHR_H_INT;
1222  c->flags = flags;
1223  }
1224  }
1225 
1226  if (c->dither == SWS_DITHER_AUTO) {
1227  if (flags & SWS_ERROR_DIFFUSION)
1228  c->dither = SWS_DITHER_ED;
1229  }
1230 
1231  if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
1232  dstFormat == AV_PIX_FMT_RGB4_BYTE ||
1233  dstFormat == AV_PIX_FMT_BGR8 ||
1234  dstFormat == AV_PIX_FMT_RGB8) {
1235  if (c->dither == SWS_DITHER_AUTO)
1236  c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;
1237  if (!(flags & SWS_FULL_CHR_H_INT)) {
1238  if (c->dither == SWS_DITHER_ED) {
1239  av_log(c, AV_LOG_DEBUG,
1240  "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",
1241  av_get_pix_fmt_name(dstFormat));
1242  flags |= SWS_FULL_CHR_H_INT;
1243  c->flags = flags;
1244  }
1245  }
1246  if (flags & SWS_FULL_CHR_H_INT) {
1247  if (c->dither == SWS_DITHER_BAYER) {
1248  av_log(c, AV_LOG_DEBUG,
1249  "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
1250  av_get_pix_fmt_name(dstFormat));
1251  c->dither = SWS_DITHER_ED;
1252  }
1253  }
1254  }
1255  if (isPlanarRGB(dstFormat)) {
1256  if (!(flags & SWS_FULL_CHR_H_INT)) {
1257  av_log(c, AV_LOG_DEBUG,
1258  "%s output is not supported with half chroma resolution, switching to full\n",
1259  av_get_pix_fmt_name(dstFormat));
1260  flags |= SWS_FULL_CHR_H_INT;
1261  c->flags = flags;
1262  }
1263  }
1264 
1265  /* reuse chroma for 2 pixels RGB/BGR unless user wants full
1266  * chroma interpolation */
1267  if (flags & SWS_FULL_CHR_H_INT &&
1268  isAnyRGB(dstFormat) &&
1269  !isPlanarRGB(dstFormat) &&
1270  dstFormat != AV_PIX_FMT_RGBA &&
1271  dstFormat != AV_PIX_FMT_ARGB &&
1272  dstFormat != AV_PIX_FMT_BGRA &&
1273  dstFormat != AV_PIX_FMT_ABGR &&
1274  dstFormat != AV_PIX_FMT_RGB24 &&
1275  dstFormat != AV_PIX_FMT_BGR24 &&
1276  dstFormat != AV_PIX_FMT_BGR4_BYTE &&
1277  dstFormat != AV_PIX_FMT_RGB4_BYTE &&
1278  dstFormat != AV_PIX_FMT_BGR8 &&
1279  dstFormat != AV_PIX_FMT_RGB8
1280  ) {
1281  av_log(c, AV_LOG_WARNING,
1282  "full chroma interpolation for destination format '%s' not yet implemented\n",
1283  av_get_pix_fmt_name(dstFormat));
1284  flags &= ~SWS_FULL_CHR_H_INT;
1285  c->flags = flags;
1286  }
1287  if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))
1288  c->chrDstHSubSample = 1;
1289 
1290  // drop some chroma lines if the user wants it
1291  c->vChrDrop = (flags & SWS_SRC_V_CHR_DROP_MASK) >>
1292  SWS_SRC_V_CHR_DROP_SHIFT;
1293  c->chrSrcVSubSample += c->vChrDrop;
1294 
1295  /* drop every other pixel for chroma calculation unless user
1296  * wants full chroma */
1297  if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP) &&
1298  srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
1299  srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
1300  srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&
1301  srcFormat != AV_PIX_FMT_GBRP9BE && srcFormat != AV_PIX_FMT_GBRP9LE &&
1302  srcFormat != AV_PIX_FMT_GBRP10BE && srcFormat != AV_PIX_FMT_GBRP10LE &&
1303  srcFormat != AV_PIX_FMT_GBRP12BE && srcFormat != AV_PIX_FMT_GBRP12LE &&
1304  srcFormat != AV_PIX_FMT_GBRP14BE && srcFormat != AV_PIX_FMT_GBRP14LE &&
1305  srcFormat != AV_PIX_FMT_GBRP16BE && srcFormat != AV_PIX_FMT_GBRP16LE &&
1306  ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
1307  (flags & SWS_FAST_BILINEAR)))
1308  c->chrSrcHSubSample = 1;
1309 
1310  // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.
1311  c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);
1312  c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);
1313  c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);
1314  c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);
1315 
1316  FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);
1317 
1318  /* unscaled special cases */
1319  if (unscaled && !usesHFilter && !usesVFilter &&
1320  (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {
1321  ff_get_unscaled_swscale(c);
1322 
1323  if (c->swscale) {
1324  if (flags & SWS_PRINT_INFO)
1325  av_log(c, AV_LOG_INFO,
1326  "using unscaled %s -> %s special converter\n",
1327  av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1328  return 0;
1329  }
1330  }
1331 
1332  c->srcBpc = 1 + desc_src->comp[0].depth_minus1;
1333  if (c->srcBpc < 8)
1334  c->srcBpc = 8;
1335  c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;
1336  if (c->dstBpc < 8)
1337  c->dstBpc = 8;
1338  if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)
1339  c->srcBpc = 16;
1340  if (c->dstBpc == 16)
1341  dst_stride <<= 1;
1342 
1343  if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
1344  c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&
1345  (srcW & 15) == 0) ? 1 : 0;
1346  if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0
1347 
1348  && (flags & SWS_FAST_BILINEAR)) {
1349  if (flags & SWS_PRINT_INFO)
1350  av_log(c, AV_LOG_INFO,
1351  "output width is not a multiple of 32 -> no MMXEXT scaler\n");
1352  }
1353  if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))
1354  c->canMMXEXTBeUsed = 0;
1355  } else
1356  c->canMMXEXTBeUsed = 0;
1357 
1358  c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
1359  c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;
1360 
1361  /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src
1362  * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do
1363  * correct scaling.
1364  * n-2 is the last chrominance sample available.
1365  * This is not perfect, but no one should notice the difference, the more
1366  * correct variant would be like the vertical one, but that would require
1367  * some special code for the first and last pixel */
1368  if (flags & SWS_FAST_BILINEAR) {
1369  if (c->canMMXEXTBeUsed) {
1370  c->lumXInc += 20;
1371  c->chrXInc += 20;
1372  }
1373  // we don't use the x86 asm scaler if MMX is available
1374  else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {
1375  c->lumXInc = ((int64_t)(srcW - 2) << 16) / (dstW - 2) - 20;
1376  c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;
1377  }
1378  }
1379 
1380 #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
1381 
1382  /* precalculate horizontal scaler filter coefficients */
1383  {
1384 #if HAVE_MMXEXT_INLINE
1385 // can't downscale !!!
1386  if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {
1387  c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,
1388  NULL, NULL, 8);
1389  c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,
1390  NULL, NULL, NULL, 4);
1391 
1392 #if USE_MMAP
1393  c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
1394  PROT_READ | PROT_WRITE,
1395  MAP_PRIVATE | MAP_ANONYMOUS,
1396  -1, 0);
1397  c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
1398  PROT_READ | PROT_WRITE,
1399  MAP_PRIVATE | MAP_ANONYMOUS,
1400  -1, 0);
1401 #elif HAVE_VIRTUALALLOC
1402  c->lumMmxextFilterCode = VirtualAlloc(NULL,
1403  c->lumMmxextFilterCodeSize,
1404  MEM_COMMIT,
1405  PAGE_EXECUTE_READWRITE);
1406  c->chrMmxextFilterCode = VirtualAlloc(NULL,
1407  c->chrMmxextFilterCodeSize,
1408  MEM_COMMIT,
1409  PAGE_EXECUTE_READWRITE);
1410 #else
1411  c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
1412  c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);
1413 #endif
1414 
1415 #ifdef MAP_ANONYMOUS
1416  if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)
1417 #else
1418  if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)
1419 #endif
1420  {
1421  av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");
1422  return AVERROR(ENOMEM);
1423  }
1424 
1425  FF_ALLOCZ_OR_GOTO(c, c->hLumFilter, (dstW / 8 + 8) * sizeof(int16_t), fail);
1426  FF_ALLOCZ_OR_GOTO(c, c->hChrFilter, (c->chrDstW / 4 + 8) * sizeof(int16_t), fail);
1427  FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW / 2 / 8 + 8) * sizeof(int32_t), fail);
1428  FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);
1429 
1430  init_hscaler_mmxext( dstW, c->lumXInc, c->lumMmxextFilterCode,
1431  c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
1432  init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
1433  c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
1434 
1435 #if USE_MMAP
1436  if ( mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1
1437  || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {
1438  av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");
1439  goto fail;
1440  }
1441 #endif
1442  } else
1443 #endif /* HAVE_MMXEXT_INLINE */
1444  {
1445  const int filterAlign = X86_MMX(cpu_flags) ? 4 :
1446  PPC_ALTIVEC(cpu_flags) ? 8 : 1;
1447 
1448  if (initFilter(&c->hLumFilter, &c->hLumFilterPos,
1449  &c->hLumFilterSize, c->lumXInc,
1450  srcW, dstW, filterAlign, 1 << 14,
1451  (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1452  cpu_flags, srcFilter->lumH, dstFilter->lumH,
1453  c->param,
1454  get_local_pos(c, 0, 0, 0),
1455  get_local_pos(c, 0, 0, 0)) < 0)
1456  goto fail;
1457  if (initFilter(&c->hChrFilter, &c->hChrFilterPos,
1458  &c->hChrFilterSize, c->chrXInc,
1459  c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
1460  (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1461  cpu_flags, srcFilter->chrH, dstFilter->chrH,
1462  c->param,
1463  get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
1464  get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)
1465  goto fail;
1466  }
1467  } // initialize horizontal stuff
1468 
1469  /* precalculate vertical scaler filter coefficients */
1470  {
1471  const int filterAlign = X86_MMX(cpu_flags) ? 2 :
1472  PPC_ALTIVEC(cpu_flags) ? 8 : 1;
1473 
1474  if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
1475  c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
1476  (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1477  cpu_flags, srcFilter->lumV, dstFilter->lumV,
1478  c->param,
1479  get_local_pos(c, 0, 0, 1),
1480  get_local_pos(c, 0, 0, 1)) < 0)
1481  goto fail;
1482  if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
1483  c->chrYInc, c->chrSrcH, c->chrDstH,
1484  filterAlign, (1 << 12),
1485  (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1486  cpu_flags, srcFilter->chrV, dstFilter->chrV,
1487  c->param,
1488  get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
1489  get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)
1490 
1491  goto fail;
1492 
1493 #if HAVE_ALTIVEC
1494  FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH, fail);
1495  FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);
1496 
1497  for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {
1498  int j;
1499  short *p = (short *)&c->vYCoeffsBank[i];
1500  for (j = 0; j < 8; j++)
1501  p[j] = c->vLumFilter[i];
1502  }
1503 
1504  for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {
1505  int j;
1506  short *p = (short *)&c->vCCoeffsBank[i];
1507  for (j = 0; j < 8; j++)
1508  p[j] = c->vChrFilter[i];
1509  }
1510 #endif
1511  }
1512 
1513  // calculate buffer sizes so that they won't run out while handling these damn slices
1514  c->vLumBufSize = c->vLumFilterSize;
1515  c->vChrBufSize = c->vChrFilterSize;
1516  for (i = 0; i < dstH; i++) {
1517  int chrI = (int64_t)i * c->chrDstH / dstH;
1518  int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,
1519  ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)
1520  << c->chrSrcVSubSample));
1521 
1522  nextSlice >>= c->chrSrcVSubSample;
1523  nextSlice <<= c->chrSrcVSubSample;
1524  if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)
1525  c->vLumBufSize = nextSlice - c->vLumFilterPos[i];
1526  if (c->vChrFilterPos[chrI] + c->vChrBufSize <
1527  (nextSlice >> c->chrSrcVSubSample))
1528  c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -
1529  c->vChrFilterPos[chrI];
1530  }
1531 
1532  for (i = 0; i < 4; i++)
1533  FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);
1534 
1535  /* Allocate pixbufs (we use dynamic allocation because otherwise we would
1536  * need to allocate several megabytes to handle all possible cases) */
1537  FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
1538  FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
1539  FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
1540  if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))
1541  FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
1542  /* Note we need at least one pixel more at the end because of the MMX code
1543  * (just in case someone wants to replace the 4000/8000). */
1544  /* align at 16 bytes for AltiVec */
1545  for (i = 0; i < c->vLumBufSize; i++) {
1546  FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],
1547  dst_stride + 16, fail);
1548  c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];
1549  }
1550  // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)
1551  c->uv_off = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);
1552  c->uv_offx2 = dst_stride + 16;
1553  for (i = 0; i < c->vChrBufSize; i++) {
1554  FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],
1555  dst_stride * 2 + 32, fail);
1556  c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];
1557  c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]
1558  = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;
1559  }
1560  if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)
1561  for (i = 0; i < c->vLumBufSize; i++) {
1562  FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],
1563  dst_stride + 16, fail);
1564  c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];
1565  }
1566 
1567  // try to avoid drawing green stuff between the right end and the stride end
1568  for (i = 0; i < c->vChrBufSize; i++)
1569  if(desc_dst->comp[0].depth_minus1 == 15){
1570  av_assert0(c->dstBpc > 14);
1571  for(j=0; j<dst_stride/2+1; j++)
1572  ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;
1573  } else
1574  for(j=0; j<dst_stride+1; j++)
1575  ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;
1576 
1577  av_assert0(c->chrDstH <= dstH);
1578 
1579  if (flags & SWS_PRINT_INFO) {
1580  const char *scaler = NULL, *cpucaps;
1581 
1582  for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
1583  if (flags & scale_algorithms[i].flag) {
1584  scaler = scale_algorithms[i].description;
1585  break;
1586  }
1587  }
1588  if (!scaler)
1589  scaler = "ehh flags invalid?!";
1590  av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",
1591  scaler,
1592  av_get_pix_fmt_name(srcFormat),
1593 #ifdef DITHER1XBPP
1594  dstFormat == AV_PIX_FMT_BGR555 || dstFormat == AV_PIX_FMT_BGR565 ||
1595  dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
1596  dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?
1597  "dithered " : "",
1598 #else
1599  "",
1600 #endif
1601  av_get_pix_fmt_name(dstFormat));
1602 
1603  if (INLINE_MMXEXT(cpu_flags))
1604  cpucaps = "MMXEXT";
1605  else if (INLINE_AMD3DNOW(cpu_flags))
1606  cpucaps = "3DNOW";
1607  else if (INLINE_MMX(cpu_flags))
1608  cpucaps = "MMX";
1609  else if (PPC_ALTIVEC(cpu_flags))
1610  cpucaps = "AltiVec";
1611  else
1612  cpucaps = "C";
1613 
1614  av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);
1615 
1616  av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);
1617  av_log(c, AV_LOG_DEBUG,
1618  "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1619  c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);
1620  av_log(c, AV_LOG_DEBUG,
1621  "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1622  c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,
1623  c->chrXInc, c->chrYInc);
1624  }
1625 
1626  c->swscale = ff_getSwsFunc(c);
1627  return 0;
1628 fail: // FIXME replace things by appropriate error codes
1629  return -1;
1630 }
1631 
1632 #if FF_API_SWS_GETCONTEXT
1633 SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
1634  int dstW, int dstH, enum AVPixelFormat dstFormat,
1635  int flags, SwsFilter *srcFilter,
1636  SwsFilter *dstFilter, const double *param)
1637 {
1638  SwsContext *c;
1639 
1640  if (!(c = sws_alloc_context()))
1641  return NULL;
1642 
1643  c->flags = flags;
1644  c->srcW = srcW;
1645  c->srcH = srcH;
1646  c->dstW = dstW;
1647  c->dstH = dstH;
1648  c->srcFormat = srcFormat;
1649  c->dstFormat = dstFormat;
1650 
1651  if (param) {
1652  c->param[0] = param[0];
1653  c->param[1] = param[1];
1654  }
1655 
1656  if (sws_init_context(c, srcFilter, dstFilter) < 0) {
1657  sws_freeContext(c);
1658  return NULL;
1659  }
1660 
1661  return c;
1662 }
1663 #endif
1664 
1665 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
1666  float lumaSharpen, float chromaSharpen,
1667  float chromaHShift, float chromaVShift,
1668  int verbose)
1669 {
1670  SwsFilter *filter = av_malloc(sizeof(SwsFilter));
1671  if (!filter)
1672  return NULL;
1673 
1674  if (lumaGBlur != 0.0) {
1675  filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
1676  filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);
1677  } else {
1678  filter->lumH = sws_getIdentityVec();
1679  filter->lumV = sws_getIdentityVec();
1680  }
1681 
1682  if (chromaGBlur != 0.0) {
1683  filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
1684  filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);
1685  } else {
1686  filter->chrH = sws_getIdentityVec();
1687  filter->chrV = sws_getIdentityVec();
1688  }
1689 
1690  if (chromaSharpen != 0.0) {
1691  SwsVector *id = sws_getIdentityVec();
1692  sws_scaleVec(filter->chrH, -chromaSharpen);
1693  sws_scaleVec(filter->chrV, -chromaSharpen);
1694  sws_addVec(filter->chrH, id);
1695  sws_addVec(filter->chrV, id);
1696  sws_freeVec(id);
1697  }
1698 
1699  if (lumaSharpen != 0.0) {
1700  SwsVector *id = sws_getIdentityVec();
1701  sws_scaleVec(filter->lumH, -lumaSharpen);
1702  sws_scaleVec(filter->lumV, -lumaSharpen);
1703  sws_addVec(filter->lumH, id);
1704  sws_addVec(filter->lumV, id);
1705  sws_freeVec(id);
1706  }
1707 
1708  if (chromaHShift != 0.0)
1709  sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));
1710 
1711  if (chromaVShift != 0.0)
1712  sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));
1713 
1714  sws_normalizeVec(filter->chrH, 1.0);
1715  sws_normalizeVec(filter->chrV, 1.0);
1716  sws_normalizeVec(filter->lumH, 1.0);
1717  sws_normalizeVec(filter->lumV, 1.0);
1718 
1719  if (verbose)
1720  sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
1721  if (verbose)
1722  sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
1723 
1724  return filter;
1725 }
1726 
1727 SwsVector *sws_allocVec(int length)
1728 {
1729  SwsVector *vec;
1730 
1731  if(length <= 0 || length > INT_MAX/ sizeof(double))
1732  return NULL;
1733 
1734  vec = av_malloc(sizeof(SwsVector));
1735  if (!vec)
1736  return NULL;
1737  vec->length = length;
1738  vec->coeff = av_malloc(sizeof(double) * length);
1739  if (!vec->coeff)
1740  av_freep(&vec);
1741  return vec;
1742 }
1743 
1744 SwsVector *sws_getGaussianVec(double variance, double quality)
1745 {
1746  const int length = (int)(variance * quality + 0.5) | 1;
1747  int i;
1748  double middle = (length - 1) * 0.5;
1749  SwsVector *vec;
1750 
1751  if(variance < 0 || quality < 0)
1752  return NULL;
1753 
1754  vec = sws_allocVec(length);
1755 
1756  if (!vec)
1757  return NULL;
1758 
1759  for (i = 0; i < length; i++) {
1760  double dist = i - middle;
1761  vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
1762  sqrt(2 * variance * M_PI);
1763  }
1764 
1765  sws_normalizeVec(vec, 1.0);
1766 
1767  return vec;
1768 }
1769 
1770 SwsVector *sws_getConstVec(double c, int length)
1771 {
1772  int i;
1773  SwsVector *vec = sws_allocVec(length);
1774 
1775  if (!vec)
1776  return NULL;
1777 
1778  for (i = 0; i < length; i++)
1779  vec->coeff[i] = c;
1780 
1781  return vec;
1782 }
1783 
1784 SwsVector *sws_getIdentityVec(void)
1785 {
1786  return sws_getConstVec(1.0, 1);
1787 }
1788 
1789 static double sws_dcVec(SwsVector *a)
1790 {
1791  int i;
1792  double sum = 0;
1793 
1794  for (i = 0; i < a->length; i++)
1795  sum += a->coeff[i];
1796 
1797  return sum;
1798 }
1799 
1800 void sws_scaleVec(SwsVector *a, double scalar)
1801 {
1802  int i;
1803 
1804  for (i = 0; i < a->length; i++)
1805  a->coeff[i] *= scalar;
1806 }
1807 
1808 void sws_normalizeVec(SwsVector *a, double height)
1809 {
1810  sws_scaleVec(a, height / sws_dcVec(a));
1811 }
1812 
1813 static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
1814 {
1815  int length = a->length + b->length - 1;
1816  int i, j;
1817  SwsVector *vec = sws_getConstVec(0.0, length);
1818 
1819  if (!vec)
1820  return NULL;
1821 
1822  for (i = 0; i < a->length; i++) {
1823  for (j = 0; j < b->length; j++) {
1824  vec->coeff[i + j] += a->coeff[i] * b->coeff[j];
1825  }
1826  }
1827 
1828  return vec;
1829 }
1830 
1831 static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
1832 {
1833  int length = FFMAX(a->length, b->length);
1834  int i;
1835  SwsVector *vec = sws_getConstVec(0.0, length);
1836 
1837  if (!vec)
1838  return NULL;
1839 
1840  for (i = 0; i < a->length; i++)
1841  vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
1842  for (i = 0; i < b->length; i++)
1843  vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];
1844 
1845  return vec;
1846 }
1847 
1848 static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
1849 {
1850  int length = FFMAX(a->length, b->length);
1851  int i;
1852  SwsVector *vec = sws_getConstVec(0.0, length);
1853 
1854  if (!vec)
1855  return NULL;
1856 
1857  for (i = 0; i < a->length; i++)
1858  vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
1859  for (i = 0; i < b->length; i++)
1860  vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];
1861 
1862  return vec;
1863 }
1864 
1865 /* shift left / or right if "shift" is negative */
1866 static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
1867 {
1868  int length = a->length + FFABS(shift) * 2;
1869  int i;
1870  SwsVector *vec = sws_getConstVec(0.0, length);
1871 
1872  if (!vec)
1873  return NULL;
1874 
1875  for (i = 0; i < a->length; i++) {
1876  vec->coeff[i + (length - 1) / 2 -
1877  (a->length - 1) / 2 - shift] = a->coeff[i];
1878  }
1879 
1880  return vec;
1881 }
1882 
1883 void sws_shiftVec(SwsVector *a, int shift)
1884 {
1885  SwsVector *shifted = sws_getShiftedVec(a, shift);
1886  av_free(a->coeff);
1887  a->coeff = shifted->coeff;
1888  a->length = shifted->length;
1889  av_free(shifted);
1890 }
1891 
1892 void sws_addVec(SwsVector *a, SwsVector *b)
1893 {
1894  SwsVector *sum = sws_sumVec(a, b);
1895  av_free(a->coeff);
1896  a->coeff = sum->coeff;
1897  a->length = sum->length;
1898  av_free(sum);
1899 }
1900 
1901 void sws_subVec(SwsVector *a, SwsVector *b)
1902 {
1903  SwsVector *diff = sws_diffVec(a, b);
1904  av_free(a->coeff);
1905  a->coeff = diff->coeff;
1906  a->length = diff->length;
1907  av_free(diff);
1908 }
1909 
1910 void sws_convVec(SwsVector *a, SwsVector *b)
1911 {
1912  SwsVector *conv = sws_getConvVec(a, b);
1913  av_free(a->coeff);
1914  a->coeff = conv->coeff;
1915  a->length = conv->length;
1916  av_free(conv);
1917 }
1918 
1919 SwsVector *sws_cloneVec(SwsVector *a)
1920 {
1921  SwsVector *vec = sws_allocVec(a->length);
1922 
1923  if (!vec)
1924  return NULL;
1925 
1926  memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));
1927 
1928  return vec;
1929 }
1930 
1931 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
1932 {
1933  int i;
1934  double max = 0;
1935  double min = 0;
1936  double range;
1937 
1938  for (i = 0; i < a->length; i++)
1939  if (a->coeff[i] > max)
1940  max = a->coeff[i];
1941 
1942  for (i = 0; i < a->length; i++)
1943  if (a->coeff[i] < min)
1944  min = a->coeff[i];
1945 
1946  range = max - min;
1947 
1948  for (i = 0; i < a->length; i++) {
1949  int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);
1950  av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
1951  for (; x > 0; x--)
1952  av_log(log_ctx, log_level, " ");
1953  av_log(log_ctx, log_level, "|\n");
1954  }
1955 }
1956 
1957 void sws_freeVec(SwsVector *a)
1958 {
1959  if (!a)
1960  return;
1961  av_freep(&a->coeff);
1962  a->length = 0;
1963  av_free(a);
1964 }
1965 
1966 void sws_freeFilter(SwsFilter *filter)
1967 {
1968  if (!filter)
1969  return;
1970 
1971  sws_freeVec(filter->lumH);
1972  sws_freeVec(filter->lumV);
1973  sws_freeVec(filter->chrH);
1974  sws_freeVec(filter->chrV);
1975  av_free(filter);
1976 }
1977 
1978 void sws_freeContext(SwsContext *c)
1979 {
1980  int i;
1981  if (!c)
1982  return;
1983 
1984  if (c->lumPixBuf) {
1985  for (i = 0; i < c->vLumBufSize; i++)
1986  av_freep(&c->lumPixBuf[i]);
1987  av_freep(&c->lumPixBuf);
1988  }
1989 
1990  if (c->chrUPixBuf) {
1991  for (i = 0; i < c->vChrBufSize; i++)
1992  av_freep(&c->chrUPixBuf[i]);
1993  av_freep(&c->chrUPixBuf);
1994  av_freep(&c->chrVPixBuf);
1995  }
1996 
1997  if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {
1998  for (i = 0; i < c->vLumBufSize; i++)
1999  av_freep(&c->alpPixBuf[i]);
2000  av_freep(&c->alpPixBuf);
2001  }
2002 
2003  for (i = 0; i < 4; i++)
2004  av_freep(&c->dither_error[i]);
2005 
2006  av_freep(&c->vLumFilter);
2007  av_freep(&c->vChrFilter);
2008  av_freep(&c->hLumFilter);
2009  av_freep(&c->hChrFilter);
2010 #if HAVE_ALTIVEC
2011  av_freep(&c->vYCoeffsBank);
2012  av_freep(&c->vCCoeffsBank);
2013 #endif
2014 
2015  av_freep(&c->vLumFilterPos);
2016  av_freep(&c->vChrFilterPos);
2017  av_freep(&c->hLumFilterPos);
2018  av_freep(&c->hChrFilterPos);
2019 
2020 #if HAVE_MMX_INLINE
2021 #if USE_MMAP
2022  if (c->lumMmxextFilterCode)
2023  munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
2024  if (c->chrMmxextFilterCode)
2025  munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);
2026 #elif HAVE_VIRTUALALLOC
2027  if (c->lumMmxextFilterCode)
2028  VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
2029  if (c->chrMmxextFilterCode)
2030  VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);
2031 #else
2032  av_free(c->lumMmxextFilterCode);
2033  av_free(c->chrMmxextFilterCode);
2034 #endif
2035  c->lumMmxextFilterCode = NULL;
2036  c->chrMmxextFilterCode = NULL;
2037 #endif /* HAVE_MMX_INLINE */
2038 
2039  av_freep(&c->yuvTable);
2040  av_freep(&c->formatConvBuffer);
2041 
2042  av_free(c);
2043 }
2044 
2045 struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,
2046  int srcH, enum AVPixelFormat srcFormat,
2047  int dstW, int dstH,
2048  enum AVPixelFormat dstFormat, int flags,
2049  SwsFilter *srcFilter,
2050  SwsFilter *dstFilter,
2051  const double *param)
2052 {
2053  static const double default_param[2] = { SWS_PARAM_DEFAULT,
2054  SWS_PARAM_DEFAULT };
2055 
2056  if (!param)
2057  param = default_param;
2058 
2059  if (context &&
2060  (context->srcW != srcW ||
2061  context->srcH != srcH ||
2062  context->srcFormat != srcFormat ||
2063  context->dstW != dstW ||
2064  context->dstH != dstH ||
2065  context->dstFormat != dstFormat ||
2066  context->flags != flags ||
2067  context->param[0] != param[0] ||
2068  context->param[1] != param[1])) {
2069  sws_freeContext(context);
2070  context = NULL;
2071  }
2072 
2073  if (!context) {
2074  if (!(context = sws_alloc_context()))
2075  return NULL;
2076  context->srcW = srcW;
2077  context->srcH = srcH;
2078  context->srcFormat = srcFormat;
2079  context->dstW = dstW;
2080  context->dstH = dstH;
2081  context->dstFormat = dstFormat;
2082  context->flags = flags;
2083  context->param[0] = param[0];
2084  context->param[1] = param[1];
2085  if (sws_init_context(context, srcFilter, dstFilter) < 0) {
2086  sws_freeContext(context);
2087  return NULL;
2088  }
2089  }
2090  return context;
2091 }
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