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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 static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
264  int *outFilterSize, int xInc, int srcW,
265  int dstW, int filterAlign, int one,
266  int flags, int cpu_flags,
267  SwsVector *srcFilter, SwsVector *dstFilter,
268  double param[2], int srcPos, int dstPos)
269 {
270  int i;
271  int filterSize;
272  int filter2Size;
273  int minFilterSize;
274  int64_t *filter = NULL;
275  int64_t *filter2 = NULL;
276  const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
277  int ret = -1;
278 
279  emms_c(); // FIXME should not be required but IS (even for non-MMX versions)
280 
281  // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
282  FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);
283 
284  if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
285  int i;
286  filterSize = 1;
287  FF_ALLOCZ_OR_GOTO(NULL, filter,
288  dstW * sizeof(*filter) * filterSize, fail);
289 
290  for (i = 0; i < dstW; i++) {
291  filter[i * filterSize] = fone;
292  (*filterPos)[i] = i;
293  }
294  } else if (flags & SWS_POINT) { // lame looking point sampling mode
295  int i;
296  int64_t xDstInSrc;
297  filterSize = 1;
298  FF_ALLOC_OR_GOTO(NULL, filter,
299  dstW * sizeof(*filter) * filterSize, fail);
300 
301  xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
302  for (i = 0; i < dstW; i++) {
303  int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
304 
305  (*filterPos)[i] = xx;
306  filter[i] = fone;
307  xDstInSrc += xInc;
308  }
309  } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
310  (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
311  int i;
312  int64_t xDstInSrc;
313  filterSize = 2;
314  FF_ALLOC_OR_GOTO(NULL, filter,
315  dstW * sizeof(*filter) * filterSize, fail);
316 
317  xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
318  for (i = 0; i < dstW; i++) {
319  int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
320  int j;
321 
322  (*filterPos)[i] = xx;
323  // bilinear upscale / linear interpolate / area averaging
324  for (j = 0; j < filterSize; j++) {
325  int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
326  if (coeff < 0)
327  coeff = 0;
328  filter[i * filterSize + j] = coeff;
329  xx++;
330  }
331  xDstInSrc += xInc;
332  }
333  } else {
334  int64_t xDstInSrc;
335  int sizeFactor;
336 
337  if (flags & SWS_BICUBIC)
338  sizeFactor = 4;
339  else if (flags & SWS_X)
340  sizeFactor = 8;
341  else if (flags & SWS_AREA)
342  sizeFactor = 1; // downscale only, for upscale it is bilinear
343  else if (flags & SWS_GAUSS)
344  sizeFactor = 8; // infinite ;)
345  else if (flags & SWS_LANCZOS)
346  sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
347  else if (flags & SWS_SINC)
348  sizeFactor = 20; // infinite ;)
349  else if (flags & SWS_SPLINE)
350  sizeFactor = 20; // infinite ;)
351  else if (flags & SWS_BILINEAR)
352  sizeFactor = 2;
353  else {
354  av_assert0(0);
355  }
356 
357  if (xInc <= 1 << 16)
358  filterSize = 1 + sizeFactor; // upscale
359  else
360  filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;
361 
362  filterSize = FFMIN(filterSize, srcW - 2);
363  filterSize = FFMAX(filterSize, 1);
364 
365  FF_ALLOC_OR_GOTO(NULL, filter,
366  dstW * sizeof(*filter) * filterSize, fail);
367 
368  xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);
369  for (i = 0; i < dstW; i++) {
370  int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);
371  int j;
372  (*filterPos)[i] = xx;
373  for (j = 0; j < filterSize; j++) {
374  int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;
375  double floatd;
376  int64_t coeff;
377 
378  if (xInc > 1 << 16)
379  d = d * dstW / srcW;
380  floatd = d * (1.0 / (1 << 30));
381 
382  if (flags & SWS_BICUBIC) {
383  int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] : 0) * (1 << 24);
384  int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);
385 
386  if (d >= 1LL << 31) {
387  coeff = 0.0;
388  } else {
389  int64_t dd = (d * d) >> 30;
390  int64_t ddd = (dd * d) >> 30;
391 
392  if (d < 1LL << 30)
393  coeff = (12 * (1 << 24) - 9 * B - 6 * C) * ddd +
394  (-18 * (1 << 24) + 12 * B + 6 * C) * dd +
395  (6 * (1 << 24) - 2 * B) * (1 << 30);
396  else
397  coeff = (-B - 6 * C) * ddd +
398  (6 * B + 30 * C) * dd +
399  (-12 * B - 48 * C) * d +
400  (8 * B + 24 * C) * (1 << 30);
401  }
402  coeff /= (1LL<<54)/fone;
403  }
404 #if 0
405  else if (flags & SWS_X) {
406  double p = param ? param * 0.01 : 0.3;
407  coeff = d ? sin(d * M_PI) / (d * M_PI) : 1.0;
408  coeff *= pow(2.0, -p * d * d);
409  }
410 #endif
411  else if (flags & SWS_X) {
412  double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
413  double c;
414 
415  if (floatd < 1.0)
416  c = cos(floatd * M_PI);
417  else
418  c = -1.0;
419  if (c < 0.0)
420  c = -pow(-c, A);
421  else
422  c = pow(c, A);
423  coeff = (c * 0.5 + 0.5) * fone;
424  } else if (flags & SWS_AREA) {
425  int64_t d2 = d - (1 << 29);
426  if (d2 * xInc < -(1LL << (29 + 16)))
427  coeff = 1.0 * (1LL << (30 + 16));
428  else if (d2 * xInc < (1LL << (29 + 16)))
429  coeff = -d2 * xInc + (1LL << (29 + 16));
430  else
431  coeff = 0.0;
432  coeff *= fone >> (30 + 16);
433  } else if (flags & SWS_GAUSS) {
434  double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
435  coeff = (pow(2.0, -p * floatd * floatd)) * fone;
436  } else if (flags & SWS_SINC) {
437  coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
438  } else if (flags & SWS_LANCZOS) {
439  double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
440  coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
441  (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
442  if (floatd > p)
443  coeff = 0;
444  } else if (flags & SWS_BILINEAR) {
445  coeff = (1 << 30) - d;
446  if (coeff < 0)
447  coeff = 0;
448  coeff *= fone >> 30;
449  } else if (flags & SWS_SPLINE) {
450  double p = -2.196152422706632;
451  coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
452  } else {
453  av_assert0(0);
454  }
455 
456  filter[i * filterSize + j] = coeff;
457  xx++;
458  }
459  xDstInSrc += 2 * xInc;
460  }
461  }
462 
463  /* apply src & dst Filter to filter -> filter2
464  * av_free(filter);
465  */
466  av_assert0(filterSize > 0);
467  filter2Size = filterSize;
468  if (srcFilter)
469  filter2Size += srcFilter->length - 1;
470  if (dstFilter)
471  filter2Size += dstFilter->length - 1;
472  av_assert0(filter2Size > 0);
473  FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);
474 
475  for (i = 0; i < dstW; i++) {
476  int j, k;
477 
478  if (srcFilter) {
479  for (k = 0; k < srcFilter->length; k++) {
480  for (j = 0; j < filterSize; j++)
481  filter2[i * filter2Size + k + j] +=
482  srcFilter->coeff[k] * filter[i * filterSize + j];
483  }
484  } else {
485  for (j = 0; j < filterSize; j++)
486  filter2[i * filter2Size + j] = filter[i * filterSize + j];
487  }
488  // FIXME dstFilter
489 
490  (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
491  }
492  av_freep(&filter);
493 
494  /* try to reduce the filter-size (step1 find size and shift left) */
495  // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
496  minFilterSize = 0;
497  for (i = dstW - 1; i >= 0; i--) {
498  int min = filter2Size;
499  int j;
500  int64_t cutOff = 0.0;
501 
502  /* get rid of near zero elements on the left by shifting left */
503  for (j = 0; j < filter2Size; j++) {
504  int k;
505  cutOff += FFABS(filter2[i * filter2Size]);
506 
507  if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
508  break;
509 
510  /* preserve monotonicity because the core can't handle the
511  * filter otherwise */
512  if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
513  break;
514 
515  // move filter coefficients left
516  for (k = 1; k < filter2Size; k++)
517  filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
518  filter2[i * filter2Size + k - 1] = 0;
519  (*filterPos)[i]++;
520  }
521 
522  cutOff = 0;
523  /* count near zeros on the right */
524  for (j = filter2Size - 1; j > 0; j--) {
525  cutOff += FFABS(filter2[i * filter2Size + j]);
526 
527  if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
528  break;
529  min--;
530  }
531 
532  if (min > minFilterSize)
533  minFilterSize = min;
534  }
535 
536  if (PPC_ALTIVEC(cpu_flags)) {
537  // we can handle the special case 4, so we don't want to go the full 8
538  if (minFilterSize < 5)
539  filterAlign = 4;
540 
541  /* We really don't want to waste our time doing useless computation, so
542  * fall back on the scalar C code for very small filters.
543  * Vectorizing is worth it only if you have a decent-sized vector. */
544  if (minFilterSize < 3)
545  filterAlign = 1;
546  }
547 
548  if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {
549  // special case for unscaled vertical filtering
550  if (minFilterSize == 1 && filterAlign == 2)
551  filterAlign = 1;
552  }
553 
554  av_assert0(minFilterSize > 0);
555  filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
556  av_assert0(filterSize > 0);
557  filter = av_malloc(filterSize * dstW * sizeof(*filter));
558  if (filterSize >= MAX_FILTER_SIZE * 16 /
559  ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {
560  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);
561  goto fail;
562  }
563  *outFilterSize = filterSize;
564 
565  if (flags & SWS_PRINT_INFO)
566  av_log(NULL, AV_LOG_VERBOSE,
567  "SwScaler: reducing / aligning filtersize %d -> %d\n",
568  filter2Size, filterSize);
569  /* try to reduce the filter-size (step2 reduce it) */
570  for (i = 0; i < dstW; i++) {
571  int j;
572 
573  for (j = 0; j < filterSize; j++) {
574  if (j >= filter2Size)
575  filter[i * filterSize + j] = 0;
576  else
577  filter[i * filterSize + j] = filter2[i * filter2Size + j];
578  if ((flags & SWS_BITEXACT) && j >= minFilterSize)
579  filter[i * filterSize + j] = 0;
580  }
581  }
582 
583  // FIXME try to align filterPos if possible
584 
585  // fix borders
586  for (i = 0; i < dstW; i++) {
587  int j;
588  if ((*filterPos)[i] < 0) {
589  // move filter coefficients left to compensate for filterPos
590  for (j = 1; j < filterSize; j++) {
591  int left = FFMAX(j + (*filterPos)[i], 0);
592  filter[i * filterSize + left] += filter[i * filterSize + j];
593  filter[i * filterSize + j] = 0;
594  }
595  (*filterPos)[i]= 0;
596  }
597 
598  if ((*filterPos)[i] + filterSize > srcW) {
599  int shift = (*filterPos)[i] + filterSize - srcW;
600  // move filter coefficients right to compensate for filterPos
601  for (j = filterSize - 2; j >= 0; j--) {
602  int right = FFMIN(j + shift, filterSize - 1);
603  filter[i * filterSize + right] += filter[i * filterSize + j];
604  filter[i * filterSize + j] = 0;
605  }
606  (*filterPos)[i]= srcW - filterSize;
607  }
608  }
609 
610  // Note the +1 is for the MMX scaler which reads over the end
611  /* align at 16 for AltiVec (needed by hScale_altivec_real) */
612  FF_ALLOCZ_OR_GOTO(NULL, *outFilter,
613  *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);
614 
615  /* normalize & store in outFilter */
616  for (i = 0; i < dstW; i++) {
617  int j;
618  int64_t error = 0;
619  int64_t sum = 0;
620 
621  for (j = 0; j < filterSize; j++) {
622  sum += filter[i * filterSize + j];
623  }
624  sum = (sum + one / 2) / one;
625  if (!sum) {
626  av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");
627  sum = 1;
628  }
629  for (j = 0; j < *outFilterSize; j++) {
630  int64_t v = filter[i * filterSize + j] + error;
631  int intV = ROUNDED_DIV(v, sum);
632  (*outFilter)[i * (*outFilterSize) + j] = intV;
633  error = v - intV * sum;
634  }
635  }
636 
637  (*filterPos)[dstW + 0] =
638  (*filterPos)[dstW + 1] =
639  (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
640  * read over the end */
641  for (i = 0; i < *outFilterSize; i++) {
642  int k = (dstW - 1) * (*outFilterSize) + i;
643  (*outFilter)[k + 1 * (*outFilterSize)] =
644  (*outFilter)[k + 2 * (*outFilterSize)] =
645  (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
646  }
647 
648  ret = 0;
649 
650 fail:
651  if(ret < 0)
652  av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");
653  av_free(filter);
654  av_free(filter2);
655  return ret;
656 }
657 
658 #if HAVE_MMXEXT_INLINE
659 static av_cold int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
660  int16_t *filter, int32_t *filterPos,
661  int numSplits)
662 {
663  uint8_t *fragmentA;
664  x86_reg imm8OfPShufW1A;
665  x86_reg imm8OfPShufW2A;
666  x86_reg fragmentLengthA;
667  uint8_t *fragmentB;
668  x86_reg imm8OfPShufW1B;
669  x86_reg imm8OfPShufW2B;
670  x86_reg fragmentLengthB;
671  int fragmentPos;
672 
673  int xpos, i;
674 
675  // create an optimized horizontal scaling routine
676  /* This scaler is made of runtime-generated MMXEXT code using specially tuned
677  * pshufw instructions. For every four output pixels, if four input pixels
678  * are enough for the fast bilinear scaling, then a chunk of fragmentB is
679  * used. If five input pixels are needed, then a chunk of fragmentA is used.
680  */
681 
682  // code fragment
683 
684  __asm__ volatile (
685  "jmp 9f \n\t"
686  // Begin
687  "0: \n\t"
688  "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
689  "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
690  "movd 1(%%"REG_c", %%"REG_S"), %%mm1 \n\t"
691  "punpcklbw %%mm7, %%mm1 \n\t"
692  "punpcklbw %%mm7, %%mm0 \n\t"
693  "pshufw $0xFF, %%mm1, %%mm1 \n\t"
694  "1: \n\t"
695  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
696  "2: \n\t"
697  "psubw %%mm1, %%mm0 \n\t"
698  "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
699  "pmullw %%mm3, %%mm0 \n\t"
700  "psllw $7, %%mm1 \n\t"
701  "paddw %%mm1, %%mm0 \n\t"
702 
703  "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
704 
705  "add $8, %%"REG_a" \n\t"
706  // End
707  "9: \n\t"
708  // "int $3 \n\t"
709  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
710  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
711  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
712  "dec %1 \n\t"
713  "dec %2 \n\t"
714  "sub %0, %1 \n\t"
715  "sub %0, %2 \n\t"
716  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
717  "sub %0, %3 \n\t"
718 
719 
720  : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
721  "=r" (fragmentLengthA)
722  );
723 
724  __asm__ volatile (
725  "jmp 9f \n\t"
726  // Begin
727  "0: \n\t"
728  "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
729  "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
730  "punpcklbw %%mm7, %%mm0 \n\t"
731  "pshufw $0xFF, %%mm0, %%mm1 \n\t"
732  "1: \n\t"
733  "pshufw $0xFF, %%mm0, %%mm0 \n\t"
734  "2: \n\t"
735  "psubw %%mm1, %%mm0 \n\t"
736  "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
737  "pmullw %%mm3, %%mm0 \n\t"
738  "psllw $7, %%mm1 \n\t"
739  "paddw %%mm1, %%mm0 \n\t"
740 
741  "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
742 
743  "add $8, %%"REG_a" \n\t"
744  // End
745  "9: \n\t"
746  // "int $3 \n\t"
747  "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
748  "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
749  "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
750  "dec %1 \n\t"
751  "dec %2 \n\t"
752  "sub %0, %1 \n\t"
753  "sub %0, %2 \n\t"
754  "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
755  "sub %0, %3 \n\t"
756 
757 
758  : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
759  "=r" (fragmentLengthB)
760  );
761 
762  xpos = 0; // lumXInc/2 - 0x8000; // difference between pixel centers
763  fragmentPos = 0;
764 
765  for (i = 0; i < dstW / numSplits; i++) {
766  int xx = xpos >> 16;
767 
768  if ((i & 3) == 0) {
769  int a = 0;
770  int b = ((xpos + xInc) >> 16) - xx;
771  int c = ((xpos + xInc * 2) >> 16) - xx;
772  int d = ((xpos + xInc * 3) >> 16) - xx;
773  int inc = (d + 1 < 4);
774  uint8_t *fragment = (d + 1 < 4) ? fragmentB : fragmentA;
775  x86_reg imm8OfPShufW1 = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;
776  x86_reg imm8OfPShufW2 = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;
777  x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;
778  int maxShift = 3 - (d + inc);
779  int shift = 0;
780 
781  if (filterCode) {
782  filter[i] = ((xpos & 0xFFFF) ^ 0xFFFF) >> 9;
783  filter[i + 1] = (((xpos + xInc) & 0xFFFF) ^ 0xFFFF) >> 9;
784  filter[i + 2] = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;
785  filter[i + 3] = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;
786  filterPos[i / 2] = xx;
787 
788  memcpy(filterCode + fragmentPos, fragment, fragmentLength);
789 
790  filterCode[fragmentPos + imm8OfPShufW1] = (a + inc) |
791  ((b + inc) << 2) |
792  ((c + inc) << 4) |
793  ((d + inc) << 6);
794  filterCode[fragmentPos + imm8OfPShufW2] = a | (b << 2) |
795  (c << 4) |
796  (d << 6);
797 
798  if (i + 4 - inc >= dstW)
799  shift = maxShift; // avoid overread
800  else if ((filterPos[i / 2] & 3) <= maxShift)
801  shift = filterPos[i / 2] & 3; // align
802 
803  if (shift && i >= shift) {
804  filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;
805  filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;
806  filterPos[i / 2] -= shift;
807  }
808  }
809 
810  fragmentPos += fragmentLength;
811 
812  if (filterCode)
813  filterCode[fragmentPos] = RET;
814  }
815  xpos += xInc;
816  }
817  if (filterCode)
818  filterPos[((i / 2) + 1) & (~1)] = xpos >> 16; // needed to jump to the next part
819 
820  return fragmentPos + 1;
821 }
822 #endif /* HAVE_MMXEXT_INLINE */
823 
824 static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
825 {
826  int64_t W, V, Z, Cy, Cu, Cv;
827  int64_t vr = table[0];
828  int64_t ub = table[1];
829  int64_t ug = -table[2];
830  int64_t vg = -table[3];
831  int64_t ONE = 65536;
832  int64_t cy = ONE;
833  uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
834  int i;
835  static const int8_t map[] = {
836  BY_IDX, GY_IDX, -1 , BY_IDX, BY_IDX, GY_IDX, -1 , BY_IDX,
837  RY_IDX, -1 , GY_IDX, RY_IDX, RY_IDX, -1 , GY_IDX, RY_IDX,
838  RY_IDX, GY_IDX, -1 , RY_IDX, RY_IDX, GY_IDX, -1 , RY_IDX,
839  BY_IDX, -1 , GY_IDX, BY_IDX, BY_IDX, -1 , GY_IDX, BY_IDX,
840  BU_IDX, GU_IDX, -1 , BU_IDX, BU_IDX, GU_IDX, -1 , BU_IDX,
841  RU_IDX, -1 , GU_IDX, RU_IDX, RU_IDX, -1 , GU_IDX, RU_IDX,
842  RU_IDX, GU_IDX, -1 , RU_IDX, RU_IDX, GU_IDX, -1 , RU_IDX,
843  BU_IDX, -1 , GU_IDX, BU_IDX, BU_IDX, -1 , GU_IDX, BU_IDX,
844  BV_IDX, GV_IDX, -1 , BV_IDX, BV_IDX, GV_IDX, -1 , BV_IDX,
845  RV_IDX, -1 , GV_IDX, RV_IDX, RV_IDX, -1 , GV_IDX, RV_IDX,
846  RV_IDX, GV_IDX, -1 , RV_IDX, RV_IDX, GV_IDX, -1 , RV_IDX,
847  BV_IDX, -1 , GV_IDX, BV_IDX, BV_IDX, -1 , GV_IDX, BV_IDX,
848  RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
849  BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
850  GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 ,
851  -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX, -1 , GY_IDX,
852  RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
853  BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
854  GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 ,
855  -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX, -1 , GU_IDX,
856  RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
857  BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
858  GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 ,
859  -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, -1 , GV_IDX, //23
860  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //24
861  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //25
862  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //26
863  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //27
864  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //28
865  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //29
866  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //30
867  -1 , -1 , -1 , -1 , -1 , -1 , -1 , -1 , //31
868  BY_IDX, GY_IDX, RY_IDX, -1 , -1 , -1 , -1 , -1 , //32
869  BU_IDX, GU_IDX, RU_IDX, -1 , -1 , -1 , -1 , -1 , //33
870  BV_IDX, GV_IDX, RV_IDX, -1 , -1 , -1 , -1 , -1 , //34
871  };
872 
873  dstRange = 0; //FIXME range = 1 is handled elsewhere
874 
875  if (!dstRange) {
876  cy = cy * 255 / 219;
877  } else {
878  vr = vr * 224 / 255;
879  ub = ub * 224 / 255;
880  ug = ug * 224 / 255;
881  vg = vg * 224 / 255;
882  }
883  W = ROUNDED_DIV(ONE*ONE*ug, ub);
884  V = ROUNDED_DIV(ONE*ONE*vg, vr);
885  Z = ONE*ONE-W-V;
886 
887  Cy = ROUNDED_DIV(cy*Z, ONE);
888  Cu = ROUNDED_DIV(ub*Z, ONE);
889  Cv = ROUNDED_DIV(vr*Z, ONE);
890 
891  c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cy);
892  c->input_rgb2yuv_table[GY_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cy);
893  c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cy);
894 
895  c->input_rgb2yuv_table[RU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V , Cu);
896  c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cu);
897  c->input_rgb2yuv_table[BU_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W) , Cu);
898 
899  c->input_rgb2yuv_table[RV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z) , Cv);
900  c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE , Cv);
901  c->input_rgb2yuv_table[BV_IDX] = ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W , Cv);
902 
903  if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {
904  c->input_rgb2yuv_table[BY_IDX] = ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
905  c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
906  c->input_rgb2yuv_table[BU_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
907  c->input_rgb2yuv_table[GY_IDX] = ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
908  c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
909  c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
910  c->input_rgb2yuv_table[RY_IDX] = ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
911  c->input_rgb2yuv_table[RV_IDX] = ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
912  c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
913  }
914  for(i=0; i<FF_ARRAY_ELEMS(map); i++)
915  AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
916 }
917 
918 static void fill_xyztables(struct SwsContext *c)
919 {
920  int i;
921  double xyzgamma = XYZ_GAMMA;
922  double rgbgamma = 1.0 / RGB_GAMMA;
923  double xyzgammainv = 1.0 / XYZ_GAMMA;
924  double rgbgammainv = RGB_GAMMA;
925  static const int16_t xyz2rgb_matrix[3][4] = {
926  {13270, -6295, -2041},
927  {-3969, 7682, 170},
928  { 228, -835, 4329} };
929  static const int16_t rgb2xyz_matrix[3][4] = {
930  {1689, 1464, 739},
931  { 871, 2929, 296},
932  { 79, 488, 3891} };
933  static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];
934 
935  memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
936  memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
937  c->xyzgamma = xyzgamma_tab;
938  c->rgbgamma = rgbgamma_tab;
939  c->xyzgammainv = xyzgammainv_tab;
940  c->rgbgammainv = rgbgammainv_tab;
941 
942  if (rgbgamma_tab[4095])
943  return;
944 
945  /* set gamma vectors */
946  for (i = 0; i < 4096; i++) {
947  xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
948  rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
949  xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);
950  rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);
951  }
952 }
953 
954 int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
955  int srcRange, const int table[4], int dstRange,
956  int brightness, int contrast, int saturation)
957 {
958  const AVPixFmtDescriptor *desc_dst;
959  const AVPixFmtDescriptor *desc_src;
960  memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
961  memmove(c->dstColorspaceTable, table, sizeof(int) * 4);
962 
963  handle_formats(c);
964  desc_dst = av_pix_fmt_desc_get(c->dstFormat);
965  desc_src = av_pix_fmt_desc_get(c->srcFormat);
966 
967  if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
968  dstRange = 0;
969  if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
970  srcRange = 0;
971 
972  c->brightness = brightness;
973  c->contrast = contrast;
974  c->saturation = saturation;
975  c->srcRange = srcRange;
976  c->dstRange = dstRange;
977 
978  if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat)))
979  return -1;
980 
981  c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
982  c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
983 
984  if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
985  ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
986  contrast, saturation);
987  // FIXME factorize
988 
989  if (ARCH_PPC)
990  ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,
991  contrast, saturation);
992  }
993 
994  fill_rgb2yuv_table(c, table, dstRange);
995 
996  return 0;
997 }
998 
999 int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
1000  int *srcRange, int **table, int *dstRange,
1001  int *brightness, int *contrast, int *saturation)
1002 {
1003  if (!c )
1004  return -1;
1005 
1006  *inv_table = c->srcColorspaceTable;
1007  *table = c->dstColorspaceTable;
1008  *srcRange = c->srcRange;
1009  *dstRange = c->dstRange;
1010  *brightness = c->brightness;
1011  *contrast = c->contrast;
1012  *saturation = c->saturation;
1013 
1014  return 0;
1015 }
1016 
1017 static int handle_jpeg(enum AVPixelFormat *format)
1018 {
1019  switch (*format) {
1020  case AV_PIX_FMT_YUVJ420P:
1021  *format = AV_PIX_FMT_YUV420P;
1022  return 1;
1023  case AV_PIX_FMT_YUVJ411P:
1024  *format = AV_PIX_FMT_YUV411P;
1025  return 1;
1026  case AV_PIX_FMT_YUVJ422P:
1027  *format = AV_PIX_FMT_YUV422P;
1028  return 1;
1029  case AV_PIX_FMT_YUVJ444P:
1030  *format = AV_PIX_FMT_YUV444P;
1031  return 1;
1032  case AV_PIX_FMT_YUVJ440P:
1033  *format = AV_PIX_FMT_YUV440P;
1034  return 1;
1035  case AV_PIX_FMT_GRAY8:
1036  return 1;
1037  default:
1038  return 0;
1039  }
1040 }
1041 
1042 static int handle_0alpha(enum AVPixelFormat *format)
1043 {
1044  switch (*format) {
1045  case AV_PIX_FMT_0BGR : *format = AV_PIX_FMT_ABGR ; return 1;
1046  case AV_PIX_FMT_BGR0 : *format = AV_PIX_FMT_BGRA ; return 4;
1047  case AV_PIX_FMT_0RGB : *format = AV_PIX_FMT_ARGB ; return 1;
1048  case AV_PIX_FMT_RGB0 : *format = AV_PIX_FMT_RGBA ; return 4;
1049  default: return 0;
1050  }
1051 }
1052 
1053 static int handle_xyz(enum AVPixelFormat *format)
1054 {
1055  switch (*format) {
1056  case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;
1057  case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;
1058  default: return 0;
1059  }
1060 }
1061 
1062 static void handle_formats(SwsContext *c)
1063 {
1064  c->src0Alpha |= handle_0alpha(&c->srcFormat);
1065  c->dst0Alpha |= handle_0alpha(&c->dstFormat);
1066  c->srcXYZ |= handle_xyz(&c->srcFormat);
1067  c->dstXYZ |= handle_xyz(&c->dstFormat);
1068  if (c->srcXYZ || c->dstXYZ)
1069  fill_xyztables(c);
1070 }
1071 
1072 SwsContext *sws_alloc_context(void)
1073 {
1074  SwsContext *c = av_mallocz(sizeof(SwsContext));
1075 
1076  if (c) {
1077  c->av_class = &sws_context_class;
1078  av_opt_set_defaults(c);
1079  }
1080 
1081  return c;
1082 }
1083 
1084 av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
1085  SwsFilter *dstFilter)
1086 {
1087  int i, j;
1088  int usesVFilter, usesHFilter;
1089  int unscaled;
1090  SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };
1091  int srcW = c->srcW;
1092  int srcH = c->srcH;
1093  int dstW = c->dstW;
1094  int dstH = c->dstH;
1095  int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 66, 16);
1096  int flags, cpu_flags;
1097  enum AVPixelFormat srcFormat = c->srcFormat;
1098  enum AVPixelFormat dstFormat = c->dstFormat;
1099  const AVPixFmtDescriptor *desc_src;
1100  const AVPixFmtDescriptor *desc_dst;
1101 
1102  cpu_flags = av_get_cpu_flags();
1103  flags = c->flags;
1104  emms_c();
1105  if (!rgb15to16)
1106  sws_rgb2rgb_init();
1107 
1108  unscaled = (srcW == dstW && srcH == dstH);
1109 
1110  c->srcRange |= handle_jpeg(&c->srcFormat);
1111  c->dstRange |= handle_jpeg(&c->dstFormat);
1112 
1113  if (!c->contrast && !c->saturation && !c->dstFormatBpp)
1114  sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
1115  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
1116  c->dstRange, 0, 1 << 16, 1 << 16);
1117 
1118  if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
1119  av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
1120  handle_formats(c);
1121  srcFormat = c->srcFormat;
1122  dstFormat = c->dstFormat;
1123  desc_src = av_pix_fmt_desc_get(srcFormat);
1124  desc_dst = av_pix_fmt_desc_get(dstFormat);
1125 
1126  if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
1127  av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
1128  if (!sws_isSupportedInput(srcFormat)) {
1129  av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
1130  av_get_pix_fmt_name(srcFormat));
1131  return AVERROR(EINVAL);
1132  }
1133  if (!sws_isSupportedOutput(dstFormat)) {
1134  av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",
1135  av_get_pix_fmt_name(dstFormat));
1136  return AVERROR(EINVAL);
1137  }
1138  }
1139 
1140  i = flags & (SWS_POINT |
1141  SWS_AREA |
1142  SWS_BILINEAR |
1143  SWS_FAST_BILINEAR |
1144  SWS_BICUBIC |
1145  SWS_X |
1146  SWS_GAUSS |
1147  SWS_LANCZOS |
1148  SWS_SINC |
1149  SWS_SPLINE |
1150  SWS_BICUBLIN);
1151 
1152  /* provide a default scaler if not set by caller */
1153  if (!i) {
1154  if (dstW < srcW && dstH < srcH)
1155  flags |= SWS_BICUBIC;
1156  else if (dstW > srcW && dstH > srcH)
1157  flags |= SWS_BICUBIC;
1158  else
1159  flags |= SWS_BICUBIC;
1160  c->flags = flags;
1161  } else if (i & (i - 1)) {
1162  av_log(c, AV_LOG_ERROR,
1163  "Exactly one scaler algorithm must be chosen, got %X\n", i);
1164  return AVERROR(EINVAL);
1165  }
1166  /* sanity check */
1167  if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {
1168  /* FIXME check if these are enough and try to lower them after
1169  * fixing the relevant parts of the code */
1170  av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",
1171  srcW, srcH, dstW, dstH);
1172  return AVERROR(EINVAL);
1173  }
1174 
1175  if (!dstFilter)
1176  dstFilter = &dummyFilter;
1177  if (!srcFilter)
1178  srcFilter = &dummyFilter;
1179 
1180  c->lumXInc = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
1181  c->lumYInc = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;
1182  c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
1183  c->srcFormatBpp = av_get_bits_per_pixel(desc_src);
1184  c->vRounder = 4 * 0x0001000100010001ULL;
1185 
1186  usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||
1187  (srcFilter->chrV && srcFilter->chrV->length > 1) ||
1188  (dstFilter->lumV && dstFilter->lumV->length > 1) ||
1189  (dstFilter->chrV && dstFilter->chrV->length > 1);
1190  usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||
1191  (srcFilter->chrH && srcFilter->chrH->length > 1) ||
1192  (dstFilter->lumH && dstFilter->lumH->length > 1) ||
1193  (dstFilter->chrH && dstFilter->chrH->length > 1);
1194 
1195  av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);
1196  av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);
1197 
1198  if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
1199  if (dstW&1) {
1200  av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
1201  flags |= SWS_FULL_CHR_H_INT;
1202  c->flags = flags;
1203  }
1204 
1205  if ( c->chrSrcHSubSample == 0
1206  && c->chrSrcVSubSample == 0
1207  && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER
1208  && !(c->flags & SWS_FAST_BILINEAR)
1209  ) {
1210  av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");
1211  flags |= SWS_FULL_CHR_H_INT;
1212  c->flags = flags;
1213  }
1214  }
1215 
1216  if (c->dither == SWS_DITHER_AUTO) {
1217  if (flags & SWS_ERROR_DIFFUSION)
1218  c->dither = SWS_DITHER_ED;
1219  }
1220 
1221  if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||
1222  dstFormat == AV_PIX_FMT_RGB4_BYTE ||
1223  dstFormat == AV_PIX_FMT_BGR8 ||
1224  dstFormat == AV_PIX_FMT_RGB8) {
1225  if (c->dither == SWS_DITHER_AUTO)
1226  c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;
1227  if (!(flags & SWS_FULL_CHR_H_INT)) {
1228  if (c->dither == SWS_DITHER_ED) {
1229  av_log(c, AV_LOG_DEBUG,
1230  "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",
1231  av_get_pix_fmt_name(dstFormat));
1232  flags |= SWS_FULL_CHR_H_INT;
1233  c->flags = flags;
1234  }
1235  }
1236  if (flags & SWS_FULL_CHR_H_INT) {
1237  if (c->dither == SWS_DITHER_BAYER) {
1238  av_log(c, AV_LOG_DEBUG,
1239  "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",
1240  av_get_pix_fmt_name(dstFormat));
1241  c->dither = SWS_DITHER_ED;
1242  }
1243  }
1244  }
1245  if (isPlanarRGB(dstFormat)) {
1246  if (!(flags & SWS_FULL_CHR_H_INT)) {
1247  av_log(c, AV_LOG_DEBUG,
1248  "%s output is not supported with half chroma resolution, switching to full\n",
1249  av_get_pix_fmt_name(dstFormat));
1250  flags |= SWS_FULL_CHR_H_INT;
1251  c->flags = flags;
1252  }
1253  }
1254 
1255  /* reuse chroma for 2 pixels RGB/BGR unless user wants full
1256  * chroma interpolation */
1257  if (flags & SWS_FULL_CHR_H_INT &&
1258  isAnyRGB(dstFormat) &&
1259  !isPlanarRGB(dstFormat) &&
1260  dstFormat != AV_PIX_FMT_RGBA &&
1261  dstFormat != AV_PIX_FMT_ARGB &&
1262  dstFormat != AV_PIX_FMT_BGRA &&
1263  dstFormat != AV_PIX_FMT_ABGR &&
1264  dstFormat != AV_PIX_FMT_RGB24 &&
1265  dstFormat != AV_PIX_FMT_BGR24 &&
1266  dstFormat != AV_PIX_FMT_BGR4_BYTE &&
1267  dstFormat != AV_PIX_FMT_RGB4_BYTE &&
1268  dstFormat != AV_PIX_FMT_BGR8 &&
1269  dstFormat != AV_PIX_FMT_RGB8
1270  ) {
1271  av_log(c, AV_LOG_WARNING,
1272  "full chroma interpolation for destination format '%s' not yet implemented\n",
1273  av_get_pix_fmt_name(dstFormat));
1274  flags &= ~SWS_FULL_CHR_H_INT;
1275  c->flags = flags;
1276  }
1277  if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))
1278  c->chrDstHSubSample = 1;
1279 
1280  // drop some chroma lines if the user wants it
1281  c->vChrDrop = (flags & SWS_SRC_V_CHR_DROP_MASK) >>
1282  SWS_SRC_V_CHR_DROP_SHIFT;
1283  c->chrSrcVSubSample += c->vChrDrop;
1284 
1285  /* drop every other pixel for chroma calculation unless user
1286  * wants full chroma */
1287  if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP) &&
1288  srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
1289  srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
1290  srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&
1291  srcFormat != AV_PIX_FMT_GBRP9BE && srcFormat != AV_PIX_FMT_GBRP9LE &&
1292  srcFormat != AV_PIX_FMT_GBRP10BE && srcFormat != AV_PIX_FMT_GBRP10LE &&
1293  srcFormat != AV_PIX_FMT_GBRP12BE && srcFormat != AV_PIX_FMT_GBRP12LE &&
1294  srcFormat != AV_PIX_FMT_GBRP14BE && srcFormat != AV_PIX_FMT_GBRP14LE &&
1295  srcFormat != AV_PIX_FMT_GBRP16BE && srcFormat != AV_PIX_FMT_GBRP16LE &&
1296  ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
1297  (flags & SWS_FAST_BILINEAR)))
1298  c->chrSrcHSubSample = 1;
1299 
1300  // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.
1301  c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);
1302  c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);
1303  c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);
1304  c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);
1305 
1306  FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);
1307 
1308  /* unscaled special cases */
1309  if (unscaled && !usesHFilter && !usesVFilter &&
1310  (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {
1311  ff_get_unscaled_swscale(c);
1312 
1313  if (c->swscale) {
1314  if (flags & SWS_PRINT_INFO)
1315  av_log(c, AV_LOG_INFO,
1316  "using unscaled %s -> %s special converter\n",
1317  av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
1318  return 0;
1319  }
1320  }
1321 
1322  c->srcBpc = 1 + desc_src->comp[0].depth_minus1;
1323  if (c->srcBpc < 8)
1324  c->srcBpc = 8;
1325  c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;
1326  if (c->dstBpc < 8)
1327  c->dstBpc = 8;
1328  if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)
1329  c->srcBpc = 16;
1330  if (c->dstBpc == 16)
1331  dst_stride <<= 1;
1332 
1333  if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {
1334  c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&
1335  c->chrDstW >= c->chrSrcW &&
1336  (srcW & 15) == 0;
1337  if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0
1338 
1339  && (flags & SWS_FAST_BILINEAR)) {
1340  if (flags & SWS_PRINT_INFO)
1341  av_log(c, AV_LOG_INFO,
1342  "output width is not a multiple of 32 -> no MMXEXT scaler\n");
1343  }
1344  if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))
1345  c->canMMXEXTBeUsed = 0;
1346  } else
1347  c->canMMXEXTBeUsed = 0;
1348 
1349  c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
1350  c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;
1351 
1352  /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src
1353  * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do
1354  * correct scaling.
1355  * n-2 is the last chrominance sample available.
1356  * This is not perfect, but no one should notice the difference, the more
1357  * correct variant would be like the vertical one, but that would require
1358  * some special code for the first and last pixel */
1359  if (flags & SWS_FAST_BILINEAR) {
1360  if (c->canMMXEXTBeUsed) {
1361  c->lumXInc += 20;
1362  c->chrXInc += 20;
1363  }
1364  // we don't use the x86 asm scaler if MMX is available
1365  else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {
1366  c->lumXInc = ((int64_t)(srcW - 2) << 16) / (dstW - 2) - 20;
1367  c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;
1368  }
1369  }
1370 
1371 #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
1372 
1373  /* precalculate horizontal scaler filter coefficients */
1374  {
1375 #if HAVE_MMXEXT_INLINE
1376 // can't downscale !!!
1377  if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {
1378  c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,
1379  NULL, NULL, 8);
1380  c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,
1381  NULL, NULL, NULL, 4);
1382 
1383 #if USE_MMAP
1384  c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
1385  PROT_READ | PROT_WRITE,
1386  MAP_PRIVATE | MAP_ANONYMOUS,
1387  -1, 0);
1388  c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
1389  PROT_READ | PROT_WRITE,
1390  MAP_PRIVATE | MAP_ANONYMOUS,
1391  -1, 0);
1392 #elif HAVE_VIRTUALALLOC
1393  c->lumMmxextFilterCode = VirtualAlloc(NULL,
1394  c->lumMmxextFilterCodeSize,
1395  MEM_COMMIT,
1396  PAGE_EXECUTE_READWRITE);
1397  c->chrMmxextFilterCode = VirtualAlloc(NULL,
1398  c->chrMmxextFilterCodeSize,
1399  MEM_COMMIT,
1400  PAGE_EXECUTE_READWRITE);
1401 #else
1402  c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
1403  c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);
1404 #endif
1405 
1406 #ifdef MAP_ANONYMOUS
1407  if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)
1408 #else
1409  if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)
1410 #endif
1411  {
1412  av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");
1413  return AVERROR(ENOMEM);
1414  }
1415 
1416  FF_ALLOCZ_OR_GOTO(c, c->hLumFilter, (dstW / 8 + 8) * sizeof(int16_t), fail);
1417  FF_ALLOCZ_OR_GOTO(c, c->hChrFilter, (c->chrDstW / 4 + 8) * sizeof(int16_t), fail);
1418  FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW / 2 / 8 + 8) * sizeof(int32_t), fail);
1419  FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);
1420 
1421  init_hscaler_mmxext( dstW, c->lumXInc, c->lumMmxextFilterCode,
1422  c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);
1423  init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,
1424  c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);
1425 
1426 #if USE_MMAP
1427  if ( mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1
1428  || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {
1429  av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");
1430  goto fail;
1431  }
1432 #endif
1433  } else
1434 #endif /* HAVE_MMXEXT_INLINE */
1435  {
1436  const int filterAlign = X86_MMX(cpu_flags) ? 4 :
1437  PPC_ALTIVEC(cpu_flags) ? 8 : 1;
1438 
1439  if (initFilter(&c->hLumFilter, &c->hLumFilterPos,
1440  &c->hLumFilterSize, c->lumXInc,
1441  srcW, dstW, filterAlign, 1 << 14,
1442  (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1443  cpu_flags, srcFilter->lumH, dstFilter->lumH,
1444  c->param,
1445  get_local_pos(c, 0, 0, 0),
1446  get_local_pos(c, 0, 0, 0)) < 0)
1447  goto fail;
1448  if (initFilter(&c->hChrFilter, &c->hChrFilterPos,
1449  &c->hChrFilterSize, c->chrXInc,
1450  c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
1451  (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1452  cpu_flags, srcFilter->chrH, dstFilter->chrH,
1453  c->param,
1454  get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
1455  get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)
1456  goto fail;
1457  }
1458  } // initialize horizontal stuff
1459 
1460  /* precalculate vertical scaler filter coefficients */
1461  {
1462  const int filterAlign = X86_MMX(cpu_flags) ? 2 :
1463  PPC_ALTIVEC(cpu_flags) ? 8 : 1;
1464 
1465  if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
1466  c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
1467  (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
1468  cpu_flags, srcFilter->lumV, dstFilter->lumV,
1469  c->param,
1470  get_local_pos(c, 0, 0, 1),
1471  get_local_pos(c, 0, 0, 1)) < 0)
1472  goto fail;
1473  if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
1474  c->chrYInc, c->chrSrcH, c->chrDstH,
1475  filterAlign, (1 << 12),
1476  (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
1477  cpu_flags, srcFilter->chrV, dstFilter->chrV,
1478  c->param,
1479  get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
1480  get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)
1481 
1482  goto fail;
1483 
1484 #if HAVE_ALTIVEC
1485  FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH, fail);
1486  FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);
1487 
1488  for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {
1489  int j;
1490  short *p = (short *)&c->vYCoeffsBank[i];
1491  for (j = 0; j < 8; j++)
1492  p[j] = c->vLumFilter[i];
1493  }
1494 
1495  for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {
1496  int j;
1497  short *p = (short *)&c->vCCoeffsBank[i];
1498  for (j = 0; j < 8; j++)
1499  p[j] = c->vChrFilter[i];
1500  }
1501 #endif
1502  }
1503 
1504  // calculate buffer sizes so that they won't run out while handling these damn slices
1505  c->vLumBufSize = c->vLumFilterSize;
1506  c->vChrBufSize = c->vChrFilterSize;
1507  for (i = 0; i < dstH; i++) {
1508  int chrI = (int64_t)i * c->chrDstH / dstH;
1509  int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,
1510  ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)
1511  << c->chrSrcVSubSample));
1512 
1513  nextSlice >>= c->chrSrcVSubSample;
1514  nextSlice <<= c->chrSrcVSubSample;
1515  if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)
1516  c->vLumBufSize = nextSlice - c->vLumFilterPos[i];
1517  if (c->vChrFilterPos[chrI] + c->vChrBufSize <
1518  (nextSlice >> c->chrSrcVSubSample))
1519  c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -
1520  c->vChrFilterPos[chrI];
1521  }
1522 
1523  for (i = 0; i < 4; i++)
1524  FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);
1525 
1526  /* Allocate pixbufs (we use dynamic allocation because otherwise we would
1527  * need to allocate several megabytes to handle all possible cases) */
1528  FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
1529  FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
1530  FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
1531  if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))
1532  FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
1533  /* Note we need at least one pixel more at the end because of the MMX code
1534  * (just in case someone wants to replace the 4000/8000). */
1535  /* align at 16 bytes for AltiVec */
1536  for (i = 0; i < c->vLumBufSize; i++) {
1537  FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],
1538  dst_stride + 16, fail);
1539  c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];
1540  }
1541  // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)
1542  c->uv_off = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);
1543  c->uv_offx2 = dst_stride + 16;
1544  for (i = 0; i < c->vChrBufSize; i++) {
1545  FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],
1546  dst_stride * 2 + 32, fail);
1547  c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];
1548  c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]
1549  = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;
1550  }
1551  if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)
1552  for (i = 0; i < c->vLumBufSize; i++) {
1553  FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],
1554  dst_stride + 16, fail);
1555  c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];
1556  }
1557 
1558  // try to avoid drawing green stuff between the right end and the stride end
1559  for (i = 0; i < c->vChrBufSize; i++)
1560  if(desc_dst->comp[0].depth_minus1 == 15){
1561  av_assert0(c->dstBpc > 14);
1562  for(j=0; j<dst_stride/2+1; j++)
1563  ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;
1564  } else
1565  for(j=0; j<dst_stride+1; j++)
1566  ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;
1567 
1568  av_assert0(c->chrDstH <= dstH);
1569 
1570  if (flags & SWS_PRINT_INFO) {
1571  const char *scaler, *cpucaps;
1572  if (flags & SWS_FAST_BILINEAR)
1573  scaler = "FAST_BILINEAR scaler";
1574  else if (flags & SWS_BILINEAR)
1575  scaler = "BILINEAR scaler";
1576  else if (flags & SWS_BICUBIC)
1577  scaler = "BICUBIC scaler";
1578  else if (flags & SWS_X)
1579  scaler = "Experimental scaler";
1580  else if (flags & SWS_POINT)
1581  scaler = "Nearest Neighbor / POINT scaler";
1582  else if (flags & SWS_AREA)
1583  scaler = "Area Averaging scaler";
1584  else if (flags & SWS_BICUBLIN)
1585  scaler = "luma BICUBIC / chroma BILINEAR scaler";
1586  else if (flags & SWS_GAUSS)
1587  scaler = "Gaussian scaler";
1588  else if (flags & SWS_SINC)
1589  scaler = "Sinc scaler";
1590  else if (flags & SWS_LANCZOS)
1591  scaler = "Lanczos scaler";
1592  else if (flags & SWS_SPLINE)
1593  scaler = "Bicubic spline scaler";
1594  else
1595  scaler = "ehh flags invalid?!";
1596 
1597  av_log(c, AV_LOG_INFO, "%s, from %s to %s%s ",
1598  scaler,
1599  av_get_pix_fmt_name(srcFormat),
1600 #ifdef DITHER1XBPP
1601  dstFormat == AV_PIX_FMT_BGR555 || dstFormat == AV_PIX_FMT_BGR565 ||
1602  dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
1603  dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?
1604  "dithered " : "",
1605 #else
1606  "",
1607 #endif
1608  av_get_pix_fmt_name(dstFormat));
1609 
1610  if (INLINE_MMXEXT(cpu_flags))
1611  cpucaps = "MMXEXT";
1612  else if (INLINE_AMD3DNOW(cpu_flags))
1613  cpucaps = "3DNOW";
1614  else if (INLINE_MMX(cpu_flags))
1615  cpucaps = "MMX";
1616  else if (PPC_ALTIVEC(cpu_flags))
1617  cpucaps = "AltiVec";
1618  else
1619  cpucaps = "C";
1620 
1621  av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);
1622 
1623  av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);
1624  av_log(c, AV_LOG_DEBUG,
1625  "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1626  c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);
1627  av_log(c, AV_LOG_DEBUG,
1628  "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1629  c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,
1630  c->chrXInc, c->chrYInc);
1631  }
1632 
1633  c->swscale = ff_getSwsFunc(c);
1634  return 0;
1635 fail: // FIXME replace things by appropriate error codes
1636  return -1;
1637 }
1638 
1639 #if FF_API_SWS_GETCONTEXT
1640 SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
1641  int dstW, int dstH, enum AVPixelFormat dstFormat,
1642  int flags, SwsFilter *srcFilter,
1643  SwsFilter *dstFilter, const double *param)
1644 {
1645  SwsContext *c;
1646 
1647  if (!(c = sws_alloc_context()))
1648  return NULL;
1649 
1650  c->flags = flags;
1651  c->srcW = srcW;
1652  c->srcH = srcH;
1653  c->dstW = dstW;
1654  c->dstH = dstH;
1655  c->srcFormat = srcFormat;
1656  c->dstFormat = dstFormat;
1657 
1658  if (param) {
1659  c->param[0] = param[0];
1660  c->param[1] = param[1];
1661  }
1662 
1663  if (sws_init_context(c, srcFilter, dstFilter) < 0) {
1664  sws_freeContext(c);
1665  return NULL;
1666  }
1667 
1668  return c;
1669 }
1670 #endif
1671 
1672 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
1673  float lumaSharpen, float chromaSharpen,
1674  float chromaHShift, float chromaVShift,
1675  int verbose)
1676 {
1677  SwsFilter *filter = av_malloc(sizeof(SwsFilter));
1678  if (!filter)
1679  return NULL;
1680 
1681  if (lumaGBlur != 0.0) {
1682  filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
1683  filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);
1684  } else {
1685  filter->lumH = sws_getIdentityVec();
1686  filter->lumV = sws_getIdentityVec();
1687  }
1688 
1689  if (chromaGBlur != 0.0) {
1690  filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
1691  filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);
1692  } else {
1693  filter->chrH = sws_getIdentityVec();
1694  filter->chrV = sws_getIdentityVec();
1695  }
1696 
1697  if (chromaSharpen != 0.0) {
1698  SwsVector *id = sws_getIdentityVec();
1699  sws_scaleVec(filter->chrH, -chromaSharpen);
1700  sws_scaleVec(filter->chrV, -chromaSharpen);
1701  sws_addVec(filter->chrH, id);
1702  sws_addVec(filter->chrV, id);
1703  sws_freeVec(id);
1704  }
1705 
1706  if (lumaSharpen != 0.0) {
1707  SwsVector *id = sws_getIdentityVec();
1708  sws_scaleVec(filter->lumH, -lumaSharpen);
1709  sws_scaleVec(filter->lumV, -lumaSharpen);
1710  sws_addVec(filter->lumH, id);
1711  sws_addVec(filter->lumV, id);
1712  sws_freeVec(id);
1713  }
1714 
1715  if (chromaHShift != 0.0)
1716  sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));
1717 
1718  if (chromaVShift != 0.0)
1719  sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));
1720 
1721  sws_normalizeVec(filter->chrH, 1.0);
1722  sws_normalizeVec(filter->chrV, 1.0);
1723  sws_normalizeVec(filter->lumH, 1.0);
1724  sws_normalizeVec(filter->lumV, 1.0);
1725 
1726  if (verbose)
1727  sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
1728  if (verbose)
1729  sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
1730 
1731  return filter;
1732 }
1733 
1734 SwsVector *sws_allocVec(int length)
1735 {
1736  SwsVector *vec;
1737 
1738  if(length <= 0 || length > INT_MAX/ sizeof(double))
1739  return NULL;
1740 
1741  vec = av_malloc(sizeof(SwsVector));
1742  if (!vec)
1743  return NULL;
1744  vec->length = length;
1745  vec->coeff = av_malloc(sizeof(double) * length);
1746  if (!vec->coeff)
1747  av_freep(&vec);
1748  return vec;
1749 }
1750 
1751 SwsVector *sws_getGaussianVec(double variance, double quality)
1752 {
1753  const int length = (int)(variance * quality + 0.5) | 1;
1754  int i;
1755  double middle = (length - 1) * 0.5;
1756  SwsVector *vec;
1757 
1758  if(variance < 0 || quality < 0)
1759  return NULL;
1760 
1761  vec = sws_allocVec(length);
1762 
1763  if (!vec)
1764  return NULL;
1765 
1766  for (i = 0; i < length; i++) {
1767  double dist = i - middle;
1768  vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
1769  sqrt(2 * variance * M_PI);
1770  }
1771 
1772  sws_normalizeVec(vec, 1.0);
1773 
1774  return vec;
1775 }
1776 
1777 SwsVector *sws_getConstVec(double c, int length)
1778 {
1779  int i;
1780  SwsVector *vec = sws_allocVec(length);
1781 
1782  if (!vec)
1783  return NULL;
1784 
1785  for (i = 0; i < length; i++)
1786  vec->coeff[i] = c;
1787 
1788  return vec;
1789 }
1790 
1791 SwsVector *sws_getIdentityVec(void)
1792 {
1793  return sws_getConstVec(1.0, 1);
1794 }
1795 
1796 static double sws_dcVec(SwsVector *a)
1797 {
1798  int i;
1799  double sum = 0;
1800 
1801  for (i = 0; i < a->length; i++)
1802  sum += a->coeff[i];
1803 
1804  return sum;
1805 }
1806 
1807 void sws_scaleVec(SwsVector *a, double scalar)
1808 {
1809  int i;
1810 
1811  for (i = 0; i < a->length; i++)
1812  a->coeff[i] *= scalar;
1813 }
1814 
1815 void sws_normalizeVec(SwsVector *a, double height)
1816 {
1817  sws_scaleVec(a, height / sws_dcVec(a));
1818 }
1819 
1820 static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
1821 {
1822  int length = a->length + b->length - 1;
1823  int i, j;
1824  SwsVector *vec = sws_getConstVec(0.0, length);
1825 
1826  if (!vec)
1827  return NULL;
1828 
1829  for (i = 0; i < a->length; i++) {
1830  for (j = 0; j < b->length; j++) {
1831  vec->coeff[i + j] += a->coeff[i] * b->coeff[j];
1832  }
1833  }
1834 
1835  return vec;
1836 }
1837 
1838 static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
1839 {
1840  int length = FFMAX(a->length, b->length);
1841  int i;
1842  SwsVector *vec = sws_getConstVec(0.0, length);
1843 
1844  if (!vec)
1845  return NULL;
1846 
1847  for (i = 0; i < a->length; i++)
1848  vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
1849  for (i = 0; i < b->length; i++)
1850  vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];
1851 
1852  return vec;
1853 }
1854 
1855 static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
1856 {
1857  int length = FFMAX(a->length, b->length);
1858  int i;
1859  SwsVector *vec = sws_getConstVec(0.0, length);
1860 
1861  if (!vec)
1862  return NULL;
1863 
1864  for (i = 0; i < a->length; i++)
1865  vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];
1866  for (i = 0; i < b->length; i++)
1867  vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];
1868 
1869  return vec;
1870 }
1871 
1872 /* shift left / or right if "shift" is negative */
1873 static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
1874 {
1875  int length = a->length + FFABS(shift) * 2;
1876  int i;
1877  SwsVector *vec = sws_getConstVec(0.0, length);
1878 
1879  if (!vec)
1880  return NULL;
1881 
1882  for (i = 0; i < a->length; i++) {
1883  vec->coeff[i + (length - 1) / 2 -
1884  (a->length - 1) / 2 - shift] = a->coeff[i];
1885  }
1886 
1887  return vec;
1888 }
1889 
1890 void sws_shiftVec(SwsVector *a, int shift)
1891 {
1892  SwsVector *shifted = sws_getShiftedVec(a, shift);
1893  av_free(a->coeff);
1894  a->coeff = shifted->coeff;
1895  a->length = shifted->length;
1896  av_free(shifted);
1897 }
1898 
1899 void sws_addVec(SwsVector *a, SwsVector *b)
1900 {
1901  SwsVector *sum = sws_sumVec(a, b);
1902  av_free(a->coeff);
1903  a->coeff = sum->coeff;
1904  a->length = sum->length;
1905  av_free(sum);
1906 }
1907 
1908 void sws_subVec(SwsVector *a, SwsVector *b)
1909 {
1910  SwsVector *diff = sws_diffVec(a, b);
1911  av_free(a->coeff);
1912  a->coeff = diff->coeff;
1913  a->length = diff->length;
1914  av_free(diff);
1915 }
1916 
1917 void sws_convVec(SwsVector *a, SwsVector *b)
1918 {
1919  SwsVector *conv = sws_getConvVec(a, b);
1920  av_free(a->coeff);
1921  a->coeff = conv->coeff;
1922  a->length = conv->length;
1923  av_free(conv);
1924 }
1925 
1926 SwsVector *sws_cloneVec(SwsVector *a)
1927 {
1928  SwsVector *vec = sws_allocVec(a->length);
1929 
1930  if (!vec)
1931  return NULL;
1932 
1933  memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));
1934 
1935  return vec;
1936 }
1937 
1938 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
1939 {
1940  int i;
1941  double max = 0;
1942  double min = 0;
1943  double range;
1944 
1945  for (i = 0; i < a->length; i++)
1946  if (a->coeff[i] > max)
1947  max = a->coeff[i];
1948 
1949  for (i = 0; i < a->length; i++)
1950  if (a->coeff[i] < min)
1951  min = a->coeff[i];
1952 
1953  range = max - min;
1954 
1955  for (i = 0; i < a->length; i++) {
1956  int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);
1957  av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
1958  for (; x > 0; x--)
1959  av_log(log_ctx, log_level, " ");
1960  av_log(log_ctx, log_level, "|\n");
1961  }
1962 }
1963 
1964 void sws_freeVec(SwsVector *a)
1965 {
1966  if (!a)
1967  return;
1968  av_freep(&a->coeff);
1969  a->length = 0;
1970  av_free(a);
1971 }
1972 
1973 void sws_freeFilter(SwsFilter *filter)
1974 {
1975  if (!filter)
1976  return;
1977 
1978  sws_freeVec(filter->lumH);
1979  sws_freeVec(filter->lumV);
1980  sws_freeVec(filter->chrH);
1981  sws_freeVec(filter->chrV);
1982  av_free(filter);
1983 }
1984 
1985 void sws_freeContext(SwsContext *c)
1986 {
1987  int i;
1988  if (!c)
1989  return;
1990 
1991  if (c->lumPixBuf) {
1992  for (i = 0; i < c->vLumBufSize; i++)
1993  av_freep(&c->lumPixBuf[i]);
1994  av_freep(&c->lumPixBuf);
1995  }
1996 
1997  if (c->chrUPixBuf) {
1998  for (i = 0; i < c->vChrBufSize; i++)
1999  av_freep(&c->chrUPixBuf[i]);
2000  av_freep(&c->chrUPixBuf);
2001  av_freep(&c->chrVPixBuf);
2002  }
2003 
2004  if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {
2005  for (i = 0; i < c->vLumBufSize; i++)
2006  av_freep(&c->alpPixBuf[i]);
2007  av_freep(&c->alpPixBuf);
2008  }
2009 
2010  for (i = 0; i < 4; i++)
2011  av_freep(&c->dither_error[i]);
2012 
2013  av_freep(&c->vLumFilter);
2014  av_freep(&c->vChrFilter);
2015  av_freep(&c->hLumFilter);
2016  av_freep(&c->hChrFilter);
2017 #if HAVE_ALTIVEC
2018  av_freep(&c->vYCoeffsBank);
2019  av_freep(&c->vCCoeffsBank);
2020 #endif
2021 
2022  av_freep(&c->vLumFilterPos);
2023  av_freep(&c->vChrFilterPos);
2024  av_freep(&c->hLumFilterPos);
2025  av_freep(&c->hChrFilterPos);
2026 
2027 #if HAVE_MMX_INLINE
2028 #if USE_MMAP
2029  if (c->lumMmxextFilterCode)
2030  munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
2031  if (c->chrMmxextFilterCode)
2032  munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);
2033 #elif HAVE_VIRTUALALLOC
2034  if (c->lumMmxextFilterCode)
2035  VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
2036  if (c->chrMmxextFilterCode)
2037  VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);
2038 #else
2039  av_free(c->lumMmxextFilterCode);
2040  av_free(c->chrMmxextFilterCode);
2041 #endif
2042  c->lumMmxextFilterCode = NULL;
2043  c->chrMmxextFilterCode = NULL;
2044 #endif /* HAVE_MMX_INLINE */
2045 
2046  av_freep(&c->yuvTable);
2047  av_freep(&c->formatConvBuffer);
2048 
2049  av_free(c);
2050 }
2051 
2052 struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,
2053  int srcH, enum AVPixelFormat srcFormat,
2054  int dstW, int dstH,
2055  enum AVPixelFormat dstFormat, int flags,
2056  SwsFilter *srcFilter,
2057  SwsFilter *dstFilter,
2058  const double *param)
2059 {
2060  static const double default_param[2] = { SWS_PARAM_DEFAULT,
2061  SWS_PARAM_DEFAULT };
2062 
2063  if (!param)
2064  param = default_param;
2065 
2066  if (context &&
2067  (context->srcW != srcW ||
2068  context->srcH != srcH ||
2069  context->srcFormat != srcFormat ||
2070  context->dstW != dstW ||
2071  context->dstH != dstH ||
2072  context->dstFormat != dstFormat ||
2073  context->flags != flags ||
2074  context->param[0] != param[0] ||
2075  context->param[1] != param[1])) {
2076  sws_freeContext(context);
2077  context = NULL;
2078  }
2079 
2080  if (!context) {
2081  if (!(context = sws_alloc_context()))
2082  return NULL;
2083  context->srcW = srcW;
2084  context->srcH = srcH;
2085  context->srcFormat = srcFormat;
2086  context->dstW = dstW;
2087  context->dstH = dstH;
2088  context->dstFormat = dstFormat;
2089  context->flags = flags;
2090  context->param[0] = param[0];
2091  context->param[1] = param[1];
2092  if (sws_init_context(context, srcFilter, dstFilter) < 0) {
2093  sws_freeContext(context);
2094  return NULL;
2095  }
2096  }
2097  return context;
2098 }
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