Split swscale.c into scaler code (swscale.c) and utility code (utils.c).
[libav.git] / libswscale / 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 modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * 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 * the C code (not assembly, mmx, ...) of this file can be used
21 * under the LGPL license too
22 */
23
24#define _SVID_SOURCE //needed for MAP_ANONYMOUS
25#include <inttypes.h>
26#include <string.h>
27#include <math.h>
28#include <stdio.h>
29#include "config.h"
30#include <assert.h>
31#if HAVE_SYS_MMAN_H
32#include <sys/mman.h>
33#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
34#define MAP_ANONYMOUS MAP_ANON
35#endif
36#endif
37#if HAVE_VIRTUALALLOC
38#define WIN32_LEAN_AND_MEAN
39#include <windows.h>
40#endif
41#include "swscale.h"
42#include "swscale_internal.h"
43#include "rgb2rgb.h"
44#include "libavutil/intreadwrite.h"
45#include "libavutil/x86_cpu.h"
46#include "libavutil/avutil.h"
47#include "libavutil/bswap.h"
48#include "libavutil/pixdesc.h"
49
50unsigned swscale_version(void)
51{
52 return LIBSWSCALE_VERSION_INT;
53}
54
55const char *swscale_configuration(void)
56{
57 return FFMPEG_CONFIGURATION;
58}
59
60const char *swscale_license(void)
61{
62#define LICENSE_PREFIX "libswscale license: "
63 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
64}
65
66#define RET 0xC3 //near return opcode for x86
67
68#ifdef M_PI
69#define PI M_PI
70#else
71#define PI 3.14159265358979323846
72#endif
73
74#define isSupportedIn(x) ( \
75 (x)==PIX_FMT_YUV420P \
76 || (x)==PIX_FMT_YUVA420P \
77 || (x)==PIX_FMT_YUYV422 \
78 || (x)==PIX_FMT_UYVY422 \
79 || (x)==PIX_FMT_RGB48BE \
80 || (x)==PIX_FMT_RGB48LE \
81 || (x)==PIX_FMT_RGB32 \
82 || (x)==PIX_FMT_RGB32_1 \
83 || (x)==PIX_FMT_BGR24 \
84 || (x)==PIX_FMT_BGR565 \
85 || (x)==PIX_FMT_BGR555 \
86 || (x)==PIX_FMT_BGR32 \
87 || (x)==PIX_FMT_BGR32_1 \
88 || (x)==PIX_FMT_RGB24 \
89 || (x)==PIX_FMT_RGB565 \
90 || (x)==PIX_FMT_RGB555 \
91 || (x)==PIX_FMT_GRAY8 \
92 || (x)==PIX_FMT_YUV410P \
93 || (x)==PIX_FMT_YUV440P \
94 || (x)==PIX_FMT_NV12 \
95 || (x)==PIX_FMT_NV21 \
96 || (x)==PIX_FMT_GRAY16BE \
97 || (x)==PIX_FMT_GRAY16LE \
98 || (x)==PIX_FMT_YUV444P \
99 || (x)==PIX_FMT_YUV422P \
100 || (x)==PIX_FMT_YUV411P \
101 || (x)==PIX_FMT_PAL8 \
102 || (x)==PIX_FMT_BGR8 \
103 || (x)==PIX_FMT_RGB8 \
104 || (x)==PIX_FMT_BGR4_BYTE \
105 || (x)==PIX_FMT_RGB4_BYTE \
106 || (x)==PIX_FMT_YUV440P \
107 || (x)==PIX_FMT_MONOWHITE \
108 || (x)==PIX_FMT_MONOBLACK \
109 || (x)==PIX_FMT_YUV420P16LE \
110 || (x)==PIX_FMT_YUV422P16LE \
111 || (x)==PIX_FMT_YUV444P16LE \
112 || (x)==PIX_FMT_YUV420P16BE \
113 || (x)==PIX_FMT_YUV422P16BE \
114 || (x)==PIX_FMT_YUV444P16BE \
115 )
116
117int sws_isSupportedInput(enum PixelFormat pix_fmt)
118{
119 return isSupportedIn(pix_fmt);
120}
121
122#define isSupportedOut(x) ( \
123 (x)==PIX_FMT_YUV420P \
124 || (x)==PIX_FMT_YUVA420P \
125 || (x)==PIX_FMT_YUYV422 \
126 || (x)==PIX_FMT_UYVY422 \
127 || (x)==PIX_FMT_YUV444P \
128 || (x)==PIX_FMT_YUV422P \
129 || (x)==PIX_FMT_YUV411P \
130 || isRGB(x) \
131 || isBGR(x) \
132 || (x)==PIX_FMT_NV12 \
133 || (x)==PIX_FMT_NV21 \
134 || (x)==PIX_FMT_GRAY16BE \
135 || (x)==PIX_FMT_GRAY16LE \
136 || (x)==PIX_FMT_GRAY8 \
137 || (x)==PIX_FMT_YUV410P \
138 || (x)==PIX_FMT_YUV440P \
139 || (x)==PIX_FMT_YUV420P16LE \
140 || (x)==PIX_FMT_YUV422P16LE \
141 || (x)==PIX_FMT_YUV444P16LE \
142 || (x)==PIX_FMT_YUV420P16BE \
143 || (x)==PIX_FMT_YUV422P16BE \
144 || (x)==PIX_FMT_YUV444P16BE \
145 )
146
147int sws_isSupportedOutput(enum PixelFormat pix_fmt)
148{
149 return isSupportedOut(pix_fmt);
150}
151
152#define usePal(x) (av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL)
153
154extern const int32_t ff_yuv2rgb_coeffs[8][4];
155
156const char *sws_format_name(enum PixelFormat format)
157{
158 if ((unsigned)format < PIX_FMT_NB && av_pix_fmt_descriptors[format].name)
159 return av_pix_fmt_descriptors[format].name;
160 else
161 return "Unknown format";
162}
163
164static double getSplineCoeff(double a, double b, double c, double d, double dist)
165{
166// printf("%f %f %f %f %f\n", a,b,c,d,dist);
167 if (dist<=1.0) return ((d*dist + c)*dist + b)*dist +a;
168 else return getSplineCoeff( 0.0,
169 b+ 2.0*c + 3.0*d,
170 c + 3.0*d,
171 -b- 3.0*c - 6.0*d,
172 dist-1.0);
173}
174
175static int initFilter(int16_t **outFilter, int16_t **filterPos, int *outFilterSize, int xInc,
176 int srcW, int dstW, int filterAlign, int one, int flags,
177 SwsVector *srcFilter, SwsVector *dstFilter, double param[2])
178{
179 int i;
180 int filterSize;
181 int filter2Size;
182 int minFilterSize;
183 int64_t *filter=NULL;
184 int64_t *filter2=NULL;
185 const int64_t fone= 1LL<<54;
186 int ret= -1;
187#if ARCH_X86
188 if (flags & SWS_CPU_CAPS_MMX)
189 __asm__ volatile("emms\n\t"::: "memory"); //FIXME this should not be required but it IS (even for non-MMX versions)
190#endif
191
192 // NOTE: the +1 is for the MMX scaler which reads over the end
193 FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW+1)*sizeof(int16_t), fail);
194
195 if (FFABS(xInc - 0x10000) <10) { // unscaled
196 int i;
197 filterSize= 1;
198 FF_ALLOCZ_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);
199
200 for (i=0; i<dstW; i++) {
201 filter[i*filterSize]= fone;
202 (*filterPos)[i]=i;
203 }
204
205 } else if (flags&SWS_POINT) { // lame looking point sampling mode
206 int i;
207 int xDstInSrc;
208 filterSize= 1;
209 FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);
210
211 xDstInSrc= xInc/2 - 0x8000;
212 for (i=0; i<dstW; i++) {
213 int xx= (xDstInSrc - ((filterSize-1)<<15) + (1<<15))>>16;
214
215 (*filterPos)[i]= xx;
216 filter[i]= fone;
217 xDstInSrc+= xInc;
218 }
219 } else if ((xInc <= (1<<16) && (flags&SWS_AREA)) || (flags&SWS_FAST_BILINEAR)) { // bilinear upscale
220 int i;
221 int xDstInSrc;
222 filterSize= 2;
223 FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);
224
225 xDstInSrc= xInc/2 - 0x8000;
226 for (i=0; i<dstW; i++) {
227 int xx= (xDstInSrc - ((filterSize-1)<<15) + (1<<15))>>16;
228 int j;
229
230 (*filterPos)[i]= xx;
231 //bilinear upscale / linear interpolate / area averaging
232 for (j=0; j<filterSize; j++) {
233 int64_t coeff= fone - FFABS((xx<<16) - xDstInSrc)*(fone>>16);
234 if (coeff<0) coeff=0;
235 filter[i*filterSize + j]= coeff;
236 xx++;
237 }
238 xDstInSrc+= xInc;
239 }
240 } else {
241 int xDstInSrc;
242 int sizeFactor;
243
244 if (flags&SWS_BICUBIC) sizeFactor= 4;
245 else if (flags&SWS_X) sizeFactor= 8;
246 else if (flags&SWS_AREA) sizeFactor= 1; //downscale only, for upscale it is bilinear
247 else if (flags&SWS_GAUSS) sizeFactor= 8; // infinite ;)
248 else if (flags&SWS_LANCZOS) sizeFactor= param[0] != SWS_PARAM_DEFAULT ? ceil(2*param[0]) : 6;
249 else if (flags&SWS_SINC) sizeFactor= 20; // infinite ;)
250 else if (flags&SWS_SPLINE) sizeFactor= 20; // infinite ;)
251 else if (flags&SWS_BILINEAR) sizeFactor= 2;
252 else {
253 sizeFactor= 0; //GCC warning killer
254 assert(0);
255 }
256
257 if (xInc <= 1<<16) filterSize= 1 + sizeFactor; // upscale
258 else filterSize= 1 + (sizeFactor*srcW + dstW - 1)/ dstW;
259
260 if (filterSize > srcW-2) filterSize=srcW-2;
261
262 FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);
263
264 xDstInSrc= xInc - 0x10000;
265 for (i=0; i<dstW; i++) {
266 int xx= (xDstInSrc - ((filterSize-2)<<16)) / (1<<17);
267 int j;
268 (*filterPos)[i]= xx;
269 for (j=0; j<filterSize; j++) {
270 int64_t d= ((int64_t)FFABS((xx<<17) - xDstInSrc))<<13;
271 double floatd;
272 int64_t coeff;
273
274 if (xInc > 1<<16)
275 d= d*dstW/srcW;
276 floatd= d * (1.0/(1<<30));
277
278 if (flags & SWS_BICUBIC) {
279 int64_t B= (param[0] != SWS_PARAM_DEFAULT ? param[0] : 0) * (1<<24);
280 int64_t C= (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1<<24);
281 int64_t dd = ( d*d)>>30;
282 int64_t ddd= (dd*d)>>30;
283
284 if (d < 1LL<<30)
285 coeff = (12*(1<<24)-9*B-6*C)*ddd + (-18*(1<<24)+12*B+6*C)*dd + (6*(1<<24)-2*B)*(1<<30);
286 else if (d < 1LL<<31)
287 coeff = (-B-6*C)*ddd + (6*B+30*C)*dd + (-12*B-48*C)*d + (8*B+24*C)*(1<<30);
288 else
289 coeff=0.0;
290 coeff *= fone>>(30+24);
291 }
292/* else if (flags & SWS_X) {
293 double p= param ? param*0.01 : 0.3;
294 coeff = d ? sin(d*PI)/(d*PI) : 1.0;
295 coeff*= pow(2.0, - p*d*d);
296 }*/
297 else if (flags & SWS_X) {
298 double A= param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
299 double c;
300
301 if (floatd<1.0)
302 c = cos(floatd*PI);
303 else
304 c=-1.0;
305 if (c<0.0) c= -pow(-c, A);
306 else c= pow( c, A);
307 coeff= (c*0.5 + 0.5)*fone;
308 } else if (flags & SWS_AREA) {
309 int64_t d2= d - (1<<29);
310 if (d2*xInc < -(1LL<<(29+16))) coeff= 1.0 * (1LL<<(30+16));
311 else if (d2*xInc < (1LL<<(29+16))) coeff= -d2*xInc + (1LL<<(29+16));
312 else coeff=0.0;
313 coeff *= fone>>(30+16);
314 } else if (flags & SWS_GAUSS) {
315 double p= param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
316 coeff = (pow(2.0, - p*floatd*floatd))*fone;
317 } else if (flags & SWS_SINC) {
318 coeff = (d ? sin(floatd*PI)/(floatd*PI) : 1.0)*fone;
319 } else if (flags & SWS_LANCZOS) {
320 double p= param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
321 coeff = (d ? sin(floatd*PI)*sin(floatd*PI/p)/(floatd*floatd*PI*PI/p) : 1.0)*fone;
322 if (floatd>p) coeff=0;
323 } else if (flags & SWS_BILINEAR) {
324 coeff= (1<<30) - d;
325 if (coeff<0) coeff=0;
326 coeff *= fone >> 30;
327 } else if (flags & SWS_SPLINE) {
328 double p=-2.196152422706632;
329 coeff = getSplineCoeff(1.0, 0.0, p, -p-1.0, floatd) * fone;
330 } else {
331 coeff= 0.0; //GCC warning killer
332 assert(0);
333 }
334
335 filter[i*filterSize + j]= coeff;
336 xx++;
337 }
338 xDstInSrc+= 2*xInc;
339 }
340 }
341
342 /* apply src & dst Filter to filter -> filter2
343 av_free(filter);
344 */
345 assert(filterSize>0);
346 filter2Size= filterSize;
347 if (srcFilter) filter2Size+= srcFilter->length - 1;
348 if (dstFilter) filter2Size+= dstFilter->length - 1;
349 assert(filter2Size>0);
350 FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size*dstW*sizeof(*filter2), fail);
351
352 for (i=0; i<dstW; i++) {
353 int j, k;
354
355 if(srcFilter) {
356 for (k=0; k<srcFilter->length; k++) {
357 for (j=0; j<filterSize; j++)
358 filter2[i*filter2Size + k + j] += srcFilter->coeff[k]*filter[i*filterSize + j];
359 }
360 } else {
361 for (j=0; j<filterSize; j++)
362 filter2[i*filter2Size + j]= filter[i*filterSize + j];
363 }
364 //FIXME dstFilter
365
366 (*filterPos)[i]+= (filterSize-1)/2 - (filter2Size-1)/2;
367 }
368 av_freep(&filter);
369
370 /* try to reduce the filter-size (step1 find size and shift left) */
371 // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
372 minFilterSize= 0;
373 for (i=dstW-1; i>=0; i--) {
374 int min= filter2Size;
375 int j;
376 int64_t cutOff=0.0;
377
378 /* get rid of near zero elements on the left by shifting left */
379 for (j=0; j<filter2Size; j++) {
380 int k;
381 cutOff += FFABS(filter2[i*filter2Size]);
382
383 if (cutOff > SWS_MAX_REDUCE_CUTOFF*fone) break;
384
385 /* preserve monotonicity because the core can't handle the filter otherwise */
386 if (i<dstW-1 && (*filterPos)[i] >= (*filterPos)[i+1]) break;
387
388 // move filter coefficients left
389 for (k=1; k<filter2Size; k++)
390 filter2[i*filter2Size + k - 1]= filter2[i*filter2Size + k];
391 filter2[i*filter2Size + k - 1]= 0;
392 (*filterPos)[i]++;
393 }
394
395 cutOff=0;
396 /* count near zeros on the right */
397 for (j=filter2Size-1; j>0; j--) {
398 cutOff += FFABS(filter2[i*filter2Size + j]);
399
400 if (cutOff > SWS_MAX_REDUCE_CUTOFF*fone) break;
401 min--;
402 }
403
404 if (min>minFilterSize) minFilterSize= min;
405 }
406
407 if (flags & SWS_CPU_CAPS_ALTIVEC) {
408 // we can handle the special case 4,
409 // so we don't want to go to the full 8
410 if (minFilterSize < 5)
411 filterAlign = 4;
412
413 // We really don't want to waste our time
414 // doing useless computation, so fall back on
415 // the scalar C code for very small filters.
416 // Vectorizing is worth it only if you have a
417 // decent-sized vector.
418 if (minFilterSize < 3)
419 filterAlign = 1;
420 }
421
422 if (flags & SWS_CPU_CAPS_MMX) {
423 // special case for unscaled vertical filtering
424 if (minFilterSize == 1 && filterAlign == 2)
425 filterAlign= 1;
426 }
427
428 assert(minFilterSize > 0);
429 filterSize= (minFilterSize +(filterAlign-1)) & (~(filterAlign-1));
430 assert(filterSize > 0);
431 filter= av_malloc(filterSize*dstW*sizeof(*filter));
432 if (filterSize >= MAX_FILTER_SIZE*16/((flags&SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter)
433 goto fail;
434 *outFilterSize= filterSize;
435
436 if (flags&SWS_PRINT_INFO)
437 av_log(NULL, AV_LOG_VERBOSE, "SwScaler: reducing / aligning filtersize %d -> %d\n", filter2Size, filterSize);
438 /* try to reduce the filter-size (step2 reduce it) */
439 for (i=0; i<dstW; i++) {
440 int j;
441
442 for (j=0; j<filterSize; j++) {
443 if (j>=filter2Size) filter[i*filterSize + j]= 0;
444 else filter[i*filterSize + j]= filter2[i*filter2Size + j];
445 if((flags & SWS_BITEXACT) && j>=minFilterSize)
446 filter[i*filterSize + j]= 0;
447 }
448 }
449
450 //FIXME try to align filterPos if possible
451
452 //fix borders
453 for (i=0; i<dstW; i++) {
454 int j;
455 if ((*filterPos)[i] < 0) {
456 // move filter coefficients left to compensate for filterPos
457 for (j=1; j<filterSize; j++) {
458 int left= FFMAX(j + (*filterPos)[i], 0);
459 filter[i*filterSize + left] += filter[i*filterSize + j];
460 filter[i*filterSize + j]=0;
461 }
462 (*filterPos)[i]= 0;
463 }
464
465 if ((*filterPos)[i] + filterSize > srcW) {
466 int shift= (*filterPos)[i] + filterSize - srcW;
467 // move filter coefficients right to compensate for filterPos
468 for (j=filterSize-2; j>=0; j--) {
469 int right= FFMIN(j + shift, filterSize-1);
470 filter[i*filterSize +right] += filter[i*filterSize +j];
471 filter[i*filterSize +j]=0;
472 }
473 (*filterPos)[i]= srcW - filterSize;
474 }
475 }
476
477 // Note the +1 is for the MMX scaler which reads over the end
478 /* align at 16 for AltiVec (needed by hScale_altivec_real) */
479 FF_ALLOCZ_OR_GOTO(NULL, *outFilter, *outFilterSize*(dstW+1)*sizeof(int16_t), fail);
480
481 /* normalize & store in outFilter */
482 for (i=0; i<dstW; i++) {
483 int j;
484 int64_t error=0;
485 int64_t sum=0;
486
487 for (j=0; j<filterSize; j++) {
488 sum+= filter[i*filterSize + j];
489 }
490 sum= (sum + one/2)/ one;
491 for (j=0; j<*outFilterSize; j++) {
492 int64_t v= filter[i*filterSize + j] + error;
493 int intV= ROUNDED_DIV(v, sum);
494 (*outFilter)[i*(*outFilterSize) + j]= intV;
495 error= v - intV*sum;
496 }
497 }
498
499 (*filterPos)[dstW]= (*filterPos)[dstW-1]; // the MMX scaler will read over the end
500 for (i=0; i<*outFilterSize; i++) {
501 int j= dstW*(*outFilterSize);
502 (*outFilter)[j + i]= (*outFilter)[j + i - (*outFilterSize)];
503 }
504
505 ret=0;
506fail:
507 av_free(filter);
508 av_free(filter2);
509 return ret;
510}
511
512#if ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL
513static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode, int16_t *filter, int32_t *filterPos, int numSplits)
514{
515 uint8_t *fragmentA;
516 x86_reg imm8OfPShufW1A;
517 x86_reg imm8OfPShufW2A;
518 x86_reg fragmentLengthA;
519 uint8_t *fragmentB;
520 x86_reg imm8OfPShufW1B;
521 x86_reg imm8OfPShufW2B;
522 x86_reg fragmentLengthB;
523 int fragmentPos;
524
525 int xpos, i;
526
527 // create an optimized horizontal scaling routine
528 /* This scaler is made of runtime-generated MMX2 code using specially
529 * tuned pshufw instructions. For every four output pixels, if four
530 * input pixels are enough for the fast bilinear scaling, then a chunk
531 * of fragmentB is used. If five input pixels are needed, then a chunk
532 * of fragmentA is used.
533 */
534
535 //code fragment
536
537 __asm__ volatile(
538 "jmp 9f \n\t"
539 // Begin
540 "0: \n\t"
541 "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
542 "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
543 "movd 1(%%"REG_c", %%"REG_S"), %%mm1 \n\t"
544 "punpcklbw %%mm7, %%mm1 \n\t"
545 "punpcklbw %%mm7, %%mm0 \n\t"
546 "pshufw $0xFF, %%mm1, %%mm1 \n\t"
547 "1: \n\t"
548 "pshufw $0xFF, %%mm0, %%mm0 \n\t"
549 "2: \n\t"
550 "psubw %%mm1, %%mm0 \n\t"
551 "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
552 "pmullw %%mm3, %%mm0 \n\t"
553 "psllw $7, %%mm1 \n\t"
554 "paddw %%mm1, %%mm0 \n\t"
555
556 "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
557
558 "add $8, %%"REG_a" \n\t"
559 // End
560 "9: \n\t"
561// "int $3 \n\t"
562 "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
563 "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
564 "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
565 "dec %1 \n\t"
566 "dec %2 \n\t"
567 "sub %0, %1 \n\t"
568 "sub %0, %2 \n\t"
569 "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
570 "sub %0, %3 \n\t"
571
572
573 :"=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
574 "=r" (fragmentLengthA)
575 );
576
577 __asm__ volatile(
578 "jmp 9f \n\t"
579 // Begin
580 "0: \n\t"
581 "movq (%%"REG_d", %%"REG_a"), %%mm3 \n\t"
582 "movd (%%"REG_c", %%"REG_S"), %%mm0 \n\t"
583 "punpcklbw %%mm7, %%mm0 \n\t"
584 "pshufw $0xFF, %%mm0, %%mm1 \n\t"
585 "1: \n\t"
586 "pshufw $0xFF, %%mm0, %%mm0 \n\t"
587 "2: \n\t"
588 "psubw %%mm1, %%mm0 \n\t"
589 "movl 8(%%"REG_b", %%"REG_a"), %%esi \n\t"
590 "pmullw %%mm3, %%mm0 \n\t"
591 "psllw $7, %%mm1 \n\t"
592 "paddw %%mm1, %%mm0 \n\t"
593
594 "movq %%mm0, (%%"REG_D", %%"REG_a") \n\t"
595
596 "add $8, %%"REG_a" \n\t"
597 // End
598 "9: \n\t"
599// "int $3 \n\t"
600 "lea " LOCAL_MANGLE(0b) ", %0 \n\t"
601 "lea " LOCAL_MANGLE(1b) ", %1 \n\t"
602 "lea " LOCAL_MANGLE(2b) ", %2 \n\t"
603 "dec %1 \n\t"
604 "dec %2 \n\t"
605 "sub %0, %1 \n\t"
606 "sub %0, %2 \n\t"
607 "lea " LOCAL_MANGLE(9b) ", %3 \n\t"
608 "sub %0, %3 \n\t"
609
610
611 :"=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
612 "=r" (fragmentLengthB)
613 );
614
615 xpos= 0; //lumXInc/2 - 0x8000; // difference between pixel centers
616 fragmentPos=0;
617
618 for (i=0; i<dstW/numSplits; i++) {
619 int xx=xpos>>16;
620
621 if ((i&3) == 0) {
622 int a=0;
623 int b=((xpos+xInc)>>16) - xx;
624 int c=((xpos+xInc*2)>>16) - xx;
625 int d=((xpos+xInc*3)>>16) - xx;
626 int inc = (d+1<4);
627 uint8_t *fragment = (d+1<4) ? fragmentB : fragmentA;
628 x86_reg imm8OfPShufW1 = (d+1<4) ? imm8OfPShufW1B : imm8OfPShufW1A;
629 x86_reg imm8OfPShufW2 = (d+1<4) ? imm8OfPShufW2B : imm8OfPShufW2A;
630 x86_reg fragmentLength = (d+1<4) ? fragmentLengthB : fragmentLengthA;
631 int maxShift= 3-(d+inc);
632 int shift=0;
633
634 if (filterCode) {
635 filter[i ] = (( xpos & 0xFFFF) ^ 0xFFFF)>>9;
636 filter[i+1] = (((xpos+xInc ) & 0xFFFF) ^ 0xFFFF)>>9;
637 filter[i+2] = (((xpos+xInc*2) & 0xFFFF) ^ 0xFFFF)>>9;
638 filter[i+3] = (((xpos+xInc*3) & 0xFFFF) ^ 0xFFFF)>>9;
639 filterPos[i/2]= xx;
640
641 memcpy(filterCode + fragmentPos, fragment, fragmentLength);
642
643 filterCode[fragmentPos + imm8OfPShufW1]=
644 (a+inc) | ((b+inc)<<2) | ((c+inc)<<4) | ((d+inc)<<6);
645 filterCode[fragmentPos + imm8OfPShufW2]=
646 a | (b<<2) | (c<<4) | (d<<6);
647
648 if (i+4-inc>=dstW) shift=maxShift; //avoid overread
649 else if ((filterPos[i/2]&3) <= maxShift) shift=filterPos[i/2]&3; //Align
650
651 if (shift && i>=shift) {
652 filterCode[fragmentPos + imm8OfPShufW1]+= 0x55*shift;
653 filterCode[fragmentPos + imm8OfPShufW2]+= 0x55*shift;
654 filterPos[i/2]-=shift;
655 }
656 }
657
658 fragmentPos+= fragmentLength;
659
660 if (filterCode)
661 filterCode[fragmentPos]= RET;
662 }
663 xpos+=xInc;
664 }
665 if (filterCode)
666 filterPos[((i/2)+1)&(~1)]= xpos>>16; // needed to jump to the next part
667
668 return fragmentPos + 1;
669}
670#endif /* ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL */
671
672static void getSubSampleFactors(int *h, int *v, enum PixelFormat format)
673{
674 *h = av_pix_fmt_descriptors[format].log2_chroma_w;
675 *v = av_pix_fmt_descriptors[format].log2_chroma_h;
676}
677
678static uint16_t roundToInt16(int64_t f)
679{
680 int r= (f + (1<<15))>>16;
681 if (r<-0x7FFF) return 0x8000;
682 else if (r> 0x7FFF) return 0x7FFF;
683 else return r;
684}
685
686int sws_setColorspaceDetails(SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)
687{
688 int64_t crv = inv_table[0];
689 int64_t cbu = inv_table[1];
690 int64_t cgu = -inv_table[2];
691 int64_t cgv = -inv_table[3];
692 int64_t cy = 1<<16;
693 int64_t oy = 0;
694
695 memcpy(c->srcColorspaceTable, inv_table, sizeof(int)*4);
696 memcpy(c->dstColorspaceTable, table, sizeof(int)*4);
697
698 c->brightness= brightness;
699 c->contrast = contrast;
700 c->saturation= saturation;
701 c->srcRange = srcRange;
702 c->dstRange = dstRange;
703 if (isYUV(c->dstFormat) || isGray(c->dstFormat)) return -1;
704
705 c->uOffset= 0x0400040004000400LL;
706 c->vOffset= 0x0400040004000400LL;
707
708 if (!srcRange) {
709 cy= (cy*255) / 219;
710 oy= 16<<16;
711 } else {
712 crv= (crv*224) / 255;
713 cbu= (cbu*224) / 255;
714 cgu= (cgu*224) / 255;
715 cgv= (cgv*224) / 255;
716 }
717
718 cy = (cy *contrast )>>16;
719 crv= (crv*contrast * saturation)>>32;
720 cbu= (cbu*contrast * saturation)>>32;
721 cgu= (cgu*contrast * saturation)>>32;
722 cgv= (cgv*contrast * saturation)>>32;
723
724 oy -= 256*brightness;
725
726 c->yCoeff= roundToInt16(cy *8192) * 0x0001000100010001ULL;
727 c->vrCoeff= roundToInt16(crv*8192) * 0x0001000100010001ULL;
728 c->ubCoeff= roundToInt16(cbu*8192) * 0x0001000100010001ULL;
729 c->vgCoeff= roundToInt16(cgv*8192) * 0x0001000100010001ULL;
730 c->ugCoeff= roundToInt16(cgu*8192) * 0x0001000100010001ULL;
731 c->yOffset= roundToInt16(oy * 8) * 0x0001000100010001ULL;
732
733 c->yuv2rgb_y_coeff = (int16_t)roundToInt16(cy <<13);
734 c->yuv2rgb_y_offset = (int16_t)roundToInt16(oy << 9);
735 c->yuv2rgb_v2r_coeff= (int16_t)roundToInt16(crv<<13);
736 c->yuv2rgb_v2g_coeff= (int16_t)roundToInt16(cgv<<13);
737 c->yuv2rgb_u2g_coeff= (int16_t)roundToInt16(cgu<<13);
738 c->yuv2rgb_u2b_coeff= (int16_t)roundToInt16(cbu<<13);
739
740 ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness, contrast, saturation);
741 //FIXME factorize
742
743#if ARCH_PPC && (HAVE_ALTIVEC || CONFIG_RUNTIME_CPUDETECT)
744 if (c->flags & SWS_CPU_CAPS_ALTIVEC)
745 ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness, contrast, saturation);
746#endif
747 return 0;
748}
749
750int sws_getColorspaceDetails(SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)
751{
752 if (isYUV(c->dstFormat) || isGray(c->dstFormat)) return -1;
753
754 *inv_table = c->srcColorspaceTable;
755 *table = c->dstColorspaceTable;
756 *srcRange = c->srcRange;
757 *dstRange = c->dstRange;
758 *brightness= c->brightness;
759 *contrast = c->contrast;
760 *saturation= c->saturation;
761
762 return 0;
763}
764
765static int handle_jpeg(enum PixelFormat *format)
766{
767 switch (*format) {
768 case PIX_FMT_YUVJ420P:
769 *format = PIX_FMT_YUV420P;
770 return 1;
771 case PIX_FMT_YUVJ422P:
772 *format = PIX_FMT_YUV422P;
773 return 1;
774 case PIX_FMT_YUVJ444P:
775 *format = PIX_FMT_YUV444P;
776 return 1;
777 case PIX_FMT_YUVJ440P:
778 *format = PIX_FMT_YUV440P;
779 return 1;
780 default:
781 return 0;
782 }
783}
784
785SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,
786 int dstW, int dstH, enum PixelFormat dstFormat, int flags,
787 SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
788{
789
790 SwsContext *c;
791 int i;
792 int usesVFilter, usesHFilter;
793 int unscaled;
794 int srcRange, dstRange;
795 SwsFilter dummyFilter= {NULL, NULL, NULL, NULL};
796#if ARCH_X86
797 if (flags & SWS_CPU_CAPS_MMX)
798 __asm__ volatile("emms\n\t"::: "memory");
799#endif
800
801#if !CONFIG_RUNTIME_CPUDETECT //ensure that the flags match the compiled variant if cpudetect is off
802 flags &= ~(SWS_CPU_CAPS_MMX|SWS_CPU_CAPS_MMX2|SWS_CPU_CAPS_3DNOW|SWS_CPU_CAPS_ALTIVEC|SWS_CPU_CAPS_BFIN);
803 flags |= ff_hardcodedcpuflags();
804#endif /* CONFIG_RUNTIME_CPUDETECT */
805 if (!rgb15to16) sws_rgb2rgb_init(flags);
806
807 unscaled = (srcW == dstW && srcH == dstH);
808
809 srcRange = handle_jpeg(&srcFormat);
810 dstRange = handle_jpeg(&dstFormat);
811
812 if (!isSupportedIn(srcFormat)) {
813 av_log(NULL, AV_LOG_ERROR, "swScaler: %s is not supported as input pixel format\n", sws_format_name(srcFormat));
814 return NULL;
815 }
816 if (!isSupportedOut(dstFormat)) {
817 av_log(NULL, AV_LOG_ERROR, "swScaler: %s is not supported as output pixel format\n", sws_format_name(dstFormat));
818 return NULL;
819 }
820
821 i= flags & ( SWS_POINT
822 |SWS_AREA
823 |SWS_BILINEAR
824 |SWS_FAST_BILINEAR
825 |SWS_BICUBIC
826 |SWS_X
827 |SWS_GAUSS
828 |SWS_LANCZOS
829 |SWS_SINC
830 |SWS_SPLINE
831 |SWS_BICUBLIN);
832 if(!i || (i & (i-1))) {
833 av_log(NULL, AV_LOG_ERROR, "swScaler: Exactly one scaler algorithm must be chosen\n");
834 return NULL;
835 }
836
837 /* sanity check */
838 if (srcW<4 || srcH<1 || dstW<8 || dstH<1) { //FIXME check if these are enough and try to lowwer them after fixing the relevant parts of the code
839 av_log(NULL, AV_LOG_ERROR, "swScaler: %dx%d -> %dx%d is invalid scaling dimension\n",
840 srcW, srcH, dstW, dstH);
841 return NULL;
842 }
843 if(srcW > VOFW || dstW > VOFW) {
844 av_log(NULL, AV_LOG_ERROR, "swScaler: Compile-time maximum width is "AV_STRINGIFY(VOFW)" change VOF/VOFW and recompile\n");
845 return NULL;
846 }
847
848 if (!dstFilter) dstFilter= &dummyFilter;
849 if (!srcFilter) srcFilter= &dummyFilter;
850
851 FF_ALLOCZ_OR_GOTO(NULL, c, sizeof(SwsContext), fail);
852
853 c->av_class = &sws_context_class;
854 c->srcW= srcW;
855 c->srcH= srcH;
856 c->dstW= dstW;
857 c->dstH= dstH;
858 c->lumXInc= ((srcW<<16) + (dstW>>1))/dstW;
859 c->lumYInc= ((srcH<<16) + (dstH>>1))/dstH;
860 c->flags= flags;
861 c->dstFormat= dstFormat;
862 c->srcFormat= srcFormat;
863 c->vRounder= 4* 0x0001000100010001ULL;
864
865 usesHFilter= usesVFilter= 0;
866 if (dstFilter->lumV && dstFilter->lumV->length>1) usesVFilter=1;
867 if (dstFilter->lumH && dstFilter->lumH->length>1) usesHFilter=1;
868 if (dstFilter->chrV && dstFilter->chrV->length>1) usesVFilter=1;
869 if (dstFilter->chrH && dstFilter->chrH->length>1) usesHFilter=1;
870 if (srcFilter->lumV && srcFilter->lumV->length>1) usesVFilter=1;
871 if (srcFilter->lumH && srcFilter->lumH->length>1) usesHFilter=1;
872 if (srcFilter->chrV && srcFilter->chrV->length>1) usesVFilter=1;
873 if (srcFilter->chrH && srcFilter->chrH->length>1) usesHFilter=1;
874
875 getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);
876 getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);
877
878 // reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation
879 if ((isBGR(dstFormat) || isRGB(dstFormat)) && !(flags&SWS_FULL_CHR_H_INT)) c->chrDstHSubSample=1;
880
881 // drop some chroma lines if the user wants it
882 c->vChrDrop= (flags&SWS_SRC_V_CHR_DROP_MASK)>>SWS_SRC_V_CHR_DROP_SHIFT;
883 c->chrSrcVSubSample+= c->vChrDrop;
884
885 // drop every other pixel for chroma calculation unless user wants full chroma
886 if ((isBGR(srcFormat) || isRGB(srcFormat)) && !(flags&SWS_FULL_CHR_H_INP)
887 && srcFormat!=PIX_FMT_RGB8 && srcFormat!=PIX_FMT_BGR8
888 && srcFormat!=PIX_FMT_RGB4 && srcFormat!=PIX_FMT_BGR4
889 && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE
890 && ((dstW>>c->chrDstHSubSample) <= (srcW>>1) || (flags&(SWS_FAST_BILINEAR|SWS_POINT))))
891 c->chrSrcHSubSample=1;
892
893 if (param) {
894 c->param[0] = param[0];
895 c->param[1] = param[1];
896 } else {
897 c->param[0] =
898 c->param[1] = SWS_PARAM_DEFAULT;
899 }
900
901 // Note the -((-x)>>y) is so that we always round toward +inf.
902 c->chrSrcW= -((-srcW) >> c->chrSrcHSubSample);
903 c->chrSrcH= -((-srcH) >> c->chrSrcVSubSample);
904 c->chrDstW= -((-dstW) >> c->chrDstHSubSample);
905 c->chrDstH= -((-dstH) >> c->chrDstVSubSample);
906
907 sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], srcRange, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/, dstRange, 0, 1<<16, 1<<16);
908
909 /* unscaled special cases */
910 if (unscaled && !usesHFilter && !usesVFilter && (srcRange == dstRange || isBGR(dstFormat) || isRGB(dstFormat))) {
911 ff_get_unscaled_swscale(c);
912
913 if (c->swScale) {
914 if (flags&SWS_PRINT_INFO)
915 av_log(c, AV_LOG_INFO, "using unscaled %s -> %s special converter\n",
916 sws_format_name(srcFormat), sws_format_name(dstFormat));
917 return c;
918 }
919 }
920
921 if (flags & SWS_CPU_CAPS_MMX2) {
922 c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 : 0;
923 if (!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && (flags&SWS_FAST_BILINEAR)) {
924 if (flags&SWS_PRINT_INFO)
925 av_log(c, AV_LOG_INFO, "output width is not a multiple of 32 -> no MMX2 scaler\n");
926 }
927 if (usesHFilter) c->canMMX2BeUsed=0;
928 }
929 else
930 c->canMMX2BeUsed=0;
931
932 c->chrXInc= ((c->chrSrcW<<16) + (c->chrDstW>>1))/c->chrDstW;
933 c->chrYInc= ((c->chrSrcH<<16) + (c->chrDstH>>1))/c->chrDstH;
934
935 // match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src to pixel n-2 of dst
936 // but only for the FAST_BILINEAR mode otherwise do correct scaling
937 // n-2 is the last chrominance sample available
938 // this is not perfect, but no one should notice the difference, the more correct variant
939 // would be like the vertical one, but that would require some special code for the
940 // first and last pixel
941 if (flags&SWS_FAST_BILINEAR) {
942 if (c->canMMX2BeUsed) {
943 c->lumXInc+= 20;
944 c->chrXInc+= 20;
945 }
946 //we don't use the x86 asm scaler if MMX is available
947 else if (flags & SWS_CPU_CAPS_MMX) {
948 c->lumXInc = ((srcW-2)<<16)/(dstW-2) - 20;
949 c->chrXInc = ((c->chrSrcW-2)<<16)/(c->chrDstW-2) - 20;
950 }
951 }
952
953 /* precalculate horizontal scaler filter coefficients */
954 {
955#if ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL
956// can't downscale !!!
957 if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {
958 c->lumMmx2FilterCodeSize = initMMX2HScaler( dstW, c->lumXInc, NULL, NULL, NULL, 8);
959 c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc, NULL, NULL, NULL, 4);
960
961#ifdef MAP_ANONYMOUS
962 c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
963 c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
964#elif HAVE_VIRTUALALLOC
965 c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
966 c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
967#else
968 c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);
969 c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);
970#endif
971
972 FF_ALLOCZ_OR_GOTO(c, c->hLumFilter , (dstW /8+8)*sizeof(int16_t), fail);
973 FF_ALLOCZ_OR_GOTO(c, c->hChrFilter , (c->chrDstW /4+8)*sizeof(int16_t), fail);
974 FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW /2/8+8)*sizeof(int32_t), fail);
975 FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW/2/4+8)*sizeof(int32_t), fail);
976
977 initMMX2HScaler( dstW, c->lumXInc, c->lumMmx2FilterCode, c->hLumFilter, c->hLumFilterPos, 8);
978 initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode, c->hChrFilter, c->hChrFilterPos, 4);
979
980#ifdef MAP_ANONYMOUS
981 mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);
982 mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);
983#endif
984 } else
985#endif /* ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL */
986 {
987 const int filterAlign=
988 (flags & SWS_CPU_CAPS_MMX) ? 4 :
989 (flags & SWS_CPU_CAPS_ALTIVEC) ? 8 :
990 1;
991
992 if (initFilter(&c->hLumFilter, &c->hLumFilterPos, &c->hLumFilterSize, c->lumXInc,
993 srcW , dstW, filterAlign, 1<<14,
994 (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC) : flags,
995 srcFilter->lumH, dstFilter->lumH, c->param) < 0)
996 goto fail;
997 if (initFilter(&c->hChrFilter, &c->hChrFilterPos, &c->hChrFilterSize, c->chrXInc,
998 c->chrSrcW, c->chrDstW, filterAlign, 1<<14,
999 (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags,
1000 srcFilter->chrH, dstFilter->chrH, c->param) < 0)
1001 goto fail;
1002 }
1003 } // initialize horizontal stuff
1004
1005 /* precalculate vertical scaler filter coefficients */
1006 {
1007 const int filterAlign=
1008 (flags & SWS_CPU_CAPS_MMX) && (flags & SWS_ACCURATE_RND) ? 2 :
1009 (flags & SWS_CPU_CAPS_ALTIVEC) ? 8 :
1010 1;
1011
1012 if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize, c->lumYInc,
1013 srcH , dstH, filterAlign, (1<<12),
1014 (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC) : flags,
1015 srcFilter->lumV, dstFilter->lumV, c->param) < 0)
1016 goto fail;
1017 if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize, c->chrYInc,
1018 c->chrSrcH, c->chrDstH, filterAlign, (1<<12),
1019 (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags,
1020 srcFilter->chrV, dstFilter->chrV, c->param) < 0)
1021 goto fail;
1022
1023#if ARCH_PPC && (HAVE_ALTIVEC || CONFIG_RUNTIME_CPUDETECT)
1024 FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof (vector signed short)*c->vLumFilterSize*c->dstH, fail);
1025 FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof (vector signed short)*c->vChrFilterSize*c->chrDstH, fail);
1026
1027 for (i=0;i<c->vLumFilterSize*c->dstH;i++) {
1028 int j;
1029 short *p = (short *)&c->vYCoeffsBank[i];
1030 for (j=0;j<8;j++)
1031 p[j] = c->vLumFilter[i];
1032 }
1033
1034 for (i=0;i<c->vChrFilterSize*c->chrDstH;i++) {
1035 int j;
1036 short *p = (short *)&c->vCCoeffsBank[i];
1037 for (j=0;j<8;j++)
1038 p[j] = c->vChrFilter[i];
1039 }
1040#endif
1041 }
1042
1043 // calculate buffer sizes so that they won't run out while handling these damn slices
1044 c->vLumBufSize= c->vLumFilterSize;
1045 c->vChrBufSize= c->vChrFilterSize;
1046 for (i=0; i<dstH; i++) {
1047 int chrI= i*c->chrDstH / dstH;
1048 int nextSlice= FFMAX(c->vLumFilterPos[i ] + c->vLumFilterSize - 1,
1049 ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<c->chrSrcVSubSample));
1050
1051 nextSlice>>= c->chrSrcVSubSample;
1052 nextSlice<<= c->chrSrcVSubSample;
1053 if (c->vLumFilterPos[i ] + c->vLumBufSize < nextSlice)
1054 c->vLumBufSize= nextSlice - c->vLumFilterPos[i];
1055 if (c->vChrFilterPos[chrI] + c->vChrBufSize < (nextSlice>>c->chrSrcVSubSample))
1056 c->vChrBufSize= (nextSlice>>c->chrSrcVSubSample) - c->vChrFilterPos[chrI];
1057 }
1058
1059 // allocate pixbufs (we use dynamic allocation because otherwise we would need to
1060 // allocate several megabytes to handle all possible cases)
1061 FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);
1062 FF_ALLOC_OR_GOTO(c, c->chrPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail);
1063 if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))
1064 FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);
1065 //Note we need at least one pixel more at the end because of the MMX code (just in case someone wanna replace the 4000/8000)
1066 /* align at 16 bytes for AltiVec */
1067 for (i=0; i<c->vLumBufSize; i++) {
1068 FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i+c->vLumBufSize], VOF+1, fail);
1069 c->lumPixBuf[i] = c->lumPixBuf[i+c->vLumBufSize];
1070 }
1071 for (i=0; i<c->vChrBufSize; i++) {
1072 FF_ALLOC_OR_GOTO(c, c->chrPixBuf[i+c->vChrBufSize], (VOF+1)*2, fail);
1073 c->chrPixBuf[i] = c->chrPixBuf[i+c->vChrBufSize];
1074 }
1075 if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)
1076 for (i=0; i<c->vLumBufSize; i++) {
1077 FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i+c->vLumBufSize], VOF+1, fail);
1078 c->alpPixBuf[i] = c->alpPixBuf[i+c->vLumBufSize];
1079 }
1080
1081 //try to avoid drawing green stuff between the right end and the stride end
1082 for (i=0; i<c->vChrBufSize; i++) memset(c->chrPixBuf[i], 64, (VOF+1)*2);
1083
1084 assert(2*VOFW == VOF);
1085
1086 assert(c->chrDstH <= dstH);
1087
1088 if (flags&SWS_PRINT_INFO) {
1089 if (flags&SWS_FAST_BILINEAR)
1090 av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");
1091 else if (flags&SWS_BILINEAR)
1092 av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");
1093 else if (flags&SWS_BICUBIC)
1094 av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");
1095 else if (flags&SWS_X)
1096 av_log(c, AV_LOG_INFO, "Experimental scaler, ");
1097 else if (flags&SWS_POINT)
1098 av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");
1099 else if (flags&SWS_AREA)
1100 av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");
1101 else if (flags&SWS_BICUBLIN)
1102 av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");
1103 else if (flags&SWS_GAUSS)
1104 av_log(c, AV_LOG_INFO, "Gaussian scaler, ");
1105 else if (flags&SWS_SINC)
1106 av_log(c, AV_LOG_INFO, "Sinc scaler, ");
1107 else if (flags&SWS_LANCZOS)
1108 av_log(c, AV_LOG_INFO, "Lanczos scaler, ");
1109 else if (flags&SWS_SPLINE)
1110 av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");
1111 else
1112 av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");
1113
1114 av_log(c, AV_LOG_INFO, "from %s to %s%s ",
1115 sws_format_name(srcFormat),
1116#ifdef DITHER1XBPP
1117 dstFormat == PIX_FMT_BGR555 || dstFormat == PIX_FMT_BGR565 ? "dithered " : "",
1118#else
1119 "",
1120#endif
1121 sws_format_name(dstFormat));
1122
1123 if (flags & SWS_CPU_CAPS_MMX2)
1124 av_log(c, AV_LOG_INFO, "using MMX2\n");
1125 else if (flags & SWS_CPU_CAPS_3DNOW)
1126 av_log(c, AV_LOG_INFO, "using 3DNOW\n");
1127 else if (flags & SWS_CPU_CAPS_MMX)
1128 av_log(c, AV_LOG_INFO, "using MMX\n");
1129 else if (flags & SWS_CPU_CAPS_ALTIVEC)
1130 av_log(c, AV_LOG_INFO, "using AltiVec\n");
1131 else
1132 av_log(c, AV_LOG_INFO, "using C\n");
1133 }
1134
1135 if (flags & SWS_PRINT_INFO) {
1136 if (flags & SWS_CPU_CAPS_MMX) {
1137 if (c->canMMX2BeUsed && (flags&SWS_FAST_BILINEAR))
1138 av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR MMX2 scaler for horizontal scaling\n");
1139 else {
1140 if (c->hLumFilterSize==4)
1141 av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal luminance scaling\n");
1142 else if (c->hLumFilterSize==8)
1143 av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal luminance scaling\n");
1144 else
1145 av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal luminance scaling\n");
1146
1147 if (c->hChrFilterSize==4)
1148 av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal chrominance scaling\n");
1149 else if (c->hChrFilterSize==8)
1150 av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal chrominance scaling\n");
1151 else
1152 av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal chrominance scaling\n");
1153 }
1154 } else {
1155#if ARCH_X86
1156 av_log(c, AV_LOG_VERBOSE, "using x86 asm scaler for horizontal scaling\n");
1157#else
1158 if (flags & SWS_FAST_BILINEAR)
1159 av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR C scaler for horizontal scaling\n");
1160 else
1161 av_log(c, AV_LOG_VERBOSE, "using C scaler for horizontal scaling\n");
1162#endif
1163 }
1164 if (isPlanarYUV(dstFormat)) {
1165 if (c->vLumFilterSize==1)
1166 av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical scaling (YV12 like)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1167 else
1168 av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (YV12 like)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1169 } else {
1170 if (c->vLumFilterSize==1 && c->vChrFilterSize==2)
1171 av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical luminance scaling (BGR)\n"
1172 " 2-tap scaler for vertical chrominance scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1173 else if (c->vLumFilterSize==2 && c->vChrFilterSize==2)
1174 av_log(c, AV_LOG_VERBOSE, "using 2-tap linear %s scaler for vertical scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1175 else
1176 av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1177 }
1178
1179 if (dstFormat==PIX_FMT_BGR24)
1180 av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR24 converter\n",
1181 (flags & SWS_CPU_CAPS_MMX2) ? "MMX2" : ((flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C"));
1182 else if (dstFormat==PIX_FMT_RGB32)
1183 av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR32 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1184 else if (dstFormat==PIX_FMT_BGR565)
1185 av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR16 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1186 else if (dstFormat==PIX_FMT_BGR555)
1187 av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR15 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");
1188
1189 av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);
1190 }
1191 if (flags & SWS_PRINT_INFO) {
1192 av_log(c, AV_LOG_DEBUG, "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1193 c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);
1194 av_log(c, AV_LOG_DEBUG, "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
1195 c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH, c->chrXInc, c->chrYInc);
1196 }
1197
1198 c->swScale= ff_getSwsFunc(c);
1199 return c;
1200
1201fail:
1202 sws_freeContext(c);
1203 return NULL;
1204}
1205
1206SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
1207 float lumaSharpen, float chromaSharpen,
1208 float chromaHShift, float chromaVShift,
1209 int verbose)
1210{
1211 SwsFilter *filter= av_malloc(sizeof(SwsFilter));
1212 if (!filter)
1213 return NULL;
1214
1215 if (lumaGBlur!=0.0) {
1216 filter->lumH= sws_getGaussianVec(lumaGBlur, 3.0);
1217 filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);
1218 } else {
1219 filter->lumH= sws_getIdentityVec();
1220 filter->lumV= sws_getIdentityVec();
1221 }
1222
1223 if (chromaGBlur!=0.0) {
1224 filter->chrH= sws_getGaussianVec(chromaGBlur, 3.0);
1225 filter->chrV= sws_getGaussianVec(chromaGBlur, 3.0);
1226 } else {
1227 filter->chrH= sws_getIdentityVec();
1228 filter->chrV= sws_getIdentityVec();
1229 }
1230
1231 if (chromaSharpen!=0.0) {
1232 SwsVector *id= sws_getIdentityVec();
1233 sws_scaleVec(filter->chrH, -chromaSharpen);
1234 sws_scaleVec(filter->chrV, -chromaSharpen);
1235 sws_addVec(filter->chrH, id);
1236 sws_addVec(filter->chrV, id);
1237 sws_freeVec(id);
1238 }
1239
1240 if (lumaSharpen!=0.0) {
1241 SwsVector *id= sws_getIdentityVec();
1242 sws_scaleVec(filter->lumH, -lumaSharpen);
1243 sws_scaleVec(filter->lumV, -lumaSharpen);
1244 sws_addVec(filter->lumH, id);
1245 sws_addVec(filter->lumV, id);
1246 sws_freeVec(id);
1247 }
1248
1249 if (chromaHShift != 0.0)
1250 sws_shiftVec(filter->chrH, (int)(chromaHShift+0.5));
1251
1252 if (chromaVShift != 0.0)
1253 sws_shiftVec(filter->chrV, (int)(chromaVShift+0.5));
1254
1255 sws_normalizeVec(filter->chrH, 1.0);
1256 sws_normalizeVec(filter->chrV, 1.0);
1257 sws_normalizeVec(filter->lumH, 1.0);
1258 sws_normalizeVec(filter->lumV, 1.0);
1259
1260 if (verbose) sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);
1261 if (verbose) sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);
1262
1263 return filter;
1264}
1265
1266SwsVector *sws_allocVec(int length)
1267{
1268 SwsVector *vec = av_malloc(sizeof(SwsVector));
1269 if (!vec)
1270 return NULL;
1271 vec->length = length;
1272 vec->coeff = av_malloc(sizeof(double) * length);
1273 if (!vec->coeff)
1274 av_freep(&vec);
1275 return vec;
1276}
1277
1278SwsVector *sws_getGaussianVec(double variance, double quality)
1279{
1280 const int length= (int)(variance*quality + 0.5) | 1;
1281 int i;
1282 double middle= (length-1)*0.5;
1283 SwsVector *vec= sws_allocVec(length);
1284
1285 if (!vec)
1286 return NULL;
1287
1288 for (i=0; i<length; i++) {
1289 double dist= i-middle;
1290 vec->coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*PI);
1291 }
1292
1293 sws_normalizeVec(vec, 1.0);
1294
1295 return vec;
1296}
1297
1298SwsVector *sws_getConstVec(double c, int length)
1299{
1300 int i;
1301 SwsVector *vec= sws_allocVec(length);
1302
1303 if (!vec)
1304 return NULL;
1305
1306 for (i=0; i<length; i++)
1307 vec->coeff[i]= c;
1308
1309 return vec;
1310}
1311
1312SwsVector *sws_getIdentityVec(void)
1313{
1314 return sws_getConstVec(1.0, 1);
1315}
1316
1317double sws_dcVec(SwsVector *a)
1318{
1319 int i;
1320 double sum=0;
1321
1322 for (i=0; i<a->length; i++)
1323 sum+= a->coeff[i];
1324
1325 return sum;
1326}
1327
1328void sws_scaleVec(SwsVector *a, double scalar)
1329{
1330 int i;
1331
1332 for (i=0; i<a->length; i++)
1333 a->coeff[i]*= scalar;
1334}
1335
1336void sws_normalizeVec(SwsVector *a, double height)
1337{
1338 sws_scaleVec(a, height/sws_dcVec(a));
1339}
1340
1341static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
1342{
1343 int length= a->length + b->length - 1;
1344 int i, j;
1345 SwsVector *vec= sws_getConstVec(0.0, length);
1346
1347 if (!vec)
1348 return NULL;
1349
1350 for (i=0; i<a->length; i++) {
1351 for (j=0; j<b->length; j++) {
1352 vec->coeff[i+j]+= a->coeff[i]*b->coeff[j];
1353 }
1354 }
1355
1356 return vec;
1357}
1358
1359static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
1360{
1361 int length= FFMAX(a->length, b->length);
1362 int i;
1363 SwsVector *vec= sws_getConstVec(0.0, length);
1364
1365 if (!vec)
1366 return NULL;
1367
1368 for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];
1369 for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]+= b->coeff[i];
1370
1371 return vec;
1372}
1373
1374static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
1375{
1376 int length= FFMAX(a->length, b->length);
1377 int i;
1378 SwsVector *vec= sws_getConstVec(0.0, length);
1379
1380 if (!vec)
1381 return NULL;
1382
1383 for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];
1384 for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]-= b->coeff[i];
1385
1386 return vec;
1387}
1388
1389/* shift left / or right if "shift" is negative */
1390static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
1391{
1392 int length= a->length + FFABS(shift)*2;
1393 int i;
1394 SwsVector *vec= sws_getConstVec(0.0, length);
1395
1396 if (!vec)
1397 return NULL;
1398
1399 for (i=0; i<a->length; i++) {
1400 vec->coeff[i + (length-1)/2 - (a->length-1)/2 - shift]= a->coeff[i];
1401 }
1402
1403 return vec;
1404}
1405
1406void sws_shiftVec(SwsVector *a, int shift)
1407{
1408 SwsVector *shifted= sws_getShiftedVec(a, shift);
1409 av_free(a->coeff);
1410 a->coeff= shifted->coeff;
1411 a->length= shifted->length;
1412 av_free(shifted);
1413}
1414
1415void sws_addVec(SwsVector *a, SwsVector *b)
1416{
1417 SwsVector *sum= sws_sumVec(a, b);
1418 av_free(a->coeff);
1419 a->coeff= sum->coeff;
1420 a->length= sum->length;
1421 av_free(sum);
1422}
1423
1424void sws_subVec(SwsVector *a, SwsVector *b)
1425{
1426 SwsVector *diff= sws_diffVec(a, b);
1427 av_free(a->coeff);
1428 a->coeff= diff->coeff;
1429 a->length= diff->length;
1430 av_free(diff);
1431}
1432
1433void sws_convVec(SwsVector *a, SwsVector *b)
1434{
1435 SwsVector *conv= sws_getConvVec(a, b);
1436 av_free(a->coeff);
1437 a->coeff= conv->coeff;
1438 a->length= conv->length;
1439 av_free(conv);
1440}
1441
1442SwsVector *sws_cloneVec(SwsVector *a)
1443{
1444 int i;
1445 SwsVector *vec= sws_allocVec(a->length);
1446
1447 if (!vec)
1448 return NULL;
1449
1450 for (i=0; i<a->length; i++) vec->coeff[i]= a->coeff[i];
1451
1452 return vec;
1453}
1454
1455void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
1456{
1457 int i;
1458 double max=0;
1459 double min=0;
1460 double range;
1461
1462 for (i=0; i<a->length; i++)
1463 if (a->coeff[i]>max) max= a->coeff[i];
1464
1465 for (i=0; i<a->length; i++)
1466 if (a->coeff[i]<min) min= a->coeff[i];
1467
1468 range= max - min;
1469
1470 for (i=0; i<a->length; i++) {
1471 int x= (int)((a->coeff[i]-min)*60.0/range +0.5);
1472 av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);
1473 for (;x>0; x--) av_log(log_ctx, log_level, " ");
1474 av_log(log_ctx, log_level, "|\n");
1475 }
1476}
1477
1478#if LIBSWSCALE_VERSION_MAJOR < 1
1479void sws_printVec(SwsVector *a)
1480{
1481 sws_printVec2(a, NULL, AV_LOG_DEBUG);
1482}
1483#endif
1484
1485void sws_freeVec(SwsVector *a)
1486{
1487 if (!a) return;
1488 av_freep(&a->coeff);
1489 a->length=0;
1490 av_free(a);
1491}
1492
1493void sws_freeFilter(SwsFilter *filter)
1494{
1495 if (!filter) return;
1496
1497 if (filter->lumH) sws_freeVec(filter->lumH);
1498 if (filter->lumV) sws_freeVec(filter->lumV);
1499 if (filter->chrH) sws_freeVec(filter->chrH);
1500 if (filter->chrV) sws_freeVec(filter->chrV);
1501 av_free(filter);
1502}
1503
1504void sws_freeContext(SwsContext *c)
1505{
1506 int i;
1507 if (!c) return;
1508
1509 if (c->lumPixBuf) {
1510 for (i=0; i<c->vLumBufSize; i++)
1511 av_freep(&c->lumPixBuf[i]);
1512 av_freep(&c->lumPixBuf);
1513 }
1514
1515 if (c->chrPixBuf) {
1516 for (i=0; i<c->vChrBufSize; i++)
1517 av_freep(&c->chrPixBuf[i]);
1518 av_freep(&c->chrPixBuf);
1519 }
1520
1521 if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {
1522 for (i=0; i<c->vLumBufSize; i++)
1523 av_freep(&c->alpPixBuf[i]);
1524 av_freep(&c->alpPixBuf);
1525 }
1526
1527 av_freep(&c->vLumFilter);
1528 av_freep(&c->vChrFilter);
1529 av_freep(&c->hLumFilter);
1530 av_freep(&c->hChrFilter);
1531#if ARCH_PPC && (HAVE_ALTIVEC || CONFIG_RUNTIME_CPUDETECT)
1532 av_freep(&c->vYCoeffsBank);
1533 av_freep(&c->vCCoeffsBank);
1534#endif
1535
1536 av_freep(&c->vLumFilterPos);
1537 av_freep(&c->vChrFilterPos);
1538 av_freep(&c->hLumFilterPos);
1539 av_freep(&c->hChrFilterPos);
1540
1541#if ARCH_X86 && CONFIG_GPL
1542#ifdef MAP_ANONYMOUS
1543 if (c->lumMmx2FilterCode) munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);
1544 if (c->chrMmx2FilterCode) munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);
1545#elif HAVE_VIRTUALALLOC
1546 if (c->lumMmx2FilterCode) VirtualFree(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, MEM_RELEASE);
1547 if (c->chrMmx2FilterCode) VirtualFree(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, MEM_RELEASE);
1548#else
1549 av_free(c->lumMmx2FilterCode);
1550 av_free(c->chrMmx2FilterCode);
1551#endif
1552 c->lumMmx2FilterCode=NULL;
1553 c->chrMmx2FilterCode=NULL;
1554#endif /* ARCH_X86 && CONFIG_GPL */
1555
1556 av_freep(&c->yuvTable);
1557
1558 av_free(c);
1559}
1560
1561struct SwsContext *sws_getCachedContext(struct SwsContext *context,
1562 int srcW, int srcH, enum PixelFormat srcFormat,
1563 int dstW, int dstH, enum PixelFormat dstFormat, int flags,
1564 SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)
1565{
1566 static const double default_param[2] = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT};
1567
1568 if (!param)
1569 param = default_param;
1570
1571 if (context) {
1572 if (context->srcW != srcW || context->srcH != srcH ||
1573 context->srcFormat != srcFormat ||
1574 context->dstW != dstW || context->dstH != dstH ||
1575 context->dstFormat != dstFormat || context->flags != flags ||
1576 context->param[0] != param[0] || context->param[1] != param[1])
1577 {
1578 sws_freeContext(context);
1579 context = NULL;
1580 }
1581 }
1582 if (!context) {
1583 return sws_getContext(srcW, srcH, srcFormat,
1584 dstW, dstH, dstFormat, flags,
1585 srcFilter, dstFilter, param);
1586 }
1587 return context;
1588}
1589