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[libav.git] / libavcodec / imgresample.c
1 /*
2 * High quality image resampling with polyphase filters
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file libavcodec/imgresample.c
24 * High quality image resampling with polyphase filters .
25 *
26 * WARNING: This file is deprecated and will be removed after FFmpeg 0.5
27 * release, do not lose your time improving it!
28 */
29
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "imgconvert.h"
33 #include "libswscale/swscale.h"
34
35 #if HAVE_ALTIVEC
36 #include "ppc/imgresample_altivec.h"
37 #endif
38
39 #define NB_COMPONENTS 3
40
41 #define PHASE_BITS 4
42 #define NB_PHASES (1 << PHASE_BITS)
43 #define NB_TAPS 4
44 #define FCENTER 1 /* index of the center of the filter */
45 //#define TEST 1 /* Test it */
46
47 #define POS_FRAC_BITS 16
48 #define POS_FRAC (1 << POS_FRAC_BITS)
49 /* 6 bits precision is needed for MMX */
50 #define FILTER_BITS 8
51
52 #define LINE_BUF_HEIGHT (NB_TAPS * 4)
53
54 struct SwsContext {
55 const AVClass *av_class;
56 struct ImgReSampleContext *resampling_ctx;
57 enum PixelFormat src_pix_fmt, dst_pix_fmt;
58 };
59
60 typedef struct ImgReSampleContext {
61 int iwidth, iheight, owidth, oheight;
62 int topBand, bottomBand, leftBand, rightBand;
63 int padtop, padbottom, padleft, padright;
64 int pad_owidth, pad_oheight;
65 int h_incr, v_incr;
66 DECLARE_ALIGNED_8(int16_t, h_filters[NB_PHASES][NB_TAPS]); /* horizontal filters */
67 DECLARE_ALIGNED_8(int16_t, v_filters[NB_PHASES][NB_TAPS]); /* vertical filters */
68 uint8_t *line_buf;
69 } ImgReSampleContext;
70
71 void av_build_filter(int16_t *filter, double factor, int tap_count, int phase_count, int scale, int type);
72
73 static inline int get_phase(int pos)
74 {
75 return ((pos) >> (POS_FRAC_BITS - PHASE_BITS)) & ((1 << PHASE_BITS) - 1);
76 }
77
78 /* This function must be optimized */
79 static void h_resample_fast(uint8_t *dst, int dst_width, const uint8_t *src,
80 int src_width, int src_start, int src_incr,
81 int16_t *filters)
82 {
83 int src_pos, phase, sum, i;
84 const uint8_t *s;
85 int16_t *filter;
86
87 src_pos = src_start;
88 for(i=0;i<dst_width;i++) {
89 #ifdef TEST
90 /* test */
91 if ((src_pos >> POS_FRAC_BITS) < 0 ||
92 (src_pos >> POS_FRAC_BITS) > (src_width - NB_TAPS))
93 av_abort();
94 #endif
95 s = src + (src_pos >> POS_FRAC_BITS);
96 phase = get_phase(src_pos);
97 filter = filters + phase * NB_TAPS;
98 #if NB_TAPS == 4
99 sum = s[0] * filter[0] +
100 s[1] * filter[1] +
101 s[2] * filter[2] +
102 s[3] * filter[3];
103 #else
104 {
105 int j;
106 sum = 0;
107 for(j=0;j<NB_TAPS;j++)
108 sum += s[j] * filter[j];
109 }
110 #endif
111 sum = sum >> FILTER_BITS;
112 if (sum < 0)
113 sum = 0;
114 else if (sum > 255)
115 sum = 255;
116 dst[0] = sum;
117 src_pos += src_incr;
118 dst++;
119 }
120 }
121
122 /* This function must be optimized */
123 static void v_resample(uint8_t *dst, int dst_width, const uint8_t *src,
124 int wrap, int16_t *filter)
125 {
126 int sum, i;
127 const uint8_t *s;
128
129 s = src;
130 for(i=0;i<dst_width;i++) {
131 #if NB_TAPS == 4
132 sum = s[0 * wrap] * filter[0] +
133 s[1 * wrap] * filter[1] +
134 s[2 * wrap] * filter[2] +
135 s[3 * wrap] * filter[3];
136 #else
137 {
138 int j;
139 uint8_t *s1 = s;
140
141 sum = 0;
142 for(j=0;j<NB_TAPS;j++) {
143 sum += s1[0] * filter[j];
144 s1 += wrap;
145 }
146 }
147 #endif
148 sum = sum >> FILTER_BITS;
149 if (sum < 0)
150 sum = 0;
151 else if (sum > 255)
152 sum = 255;
153 dst[0] = sum;
154 dst++;
155 s++;
156 }
157 }
158
159 #if HAVE_MMX
160
161 #include "x86/mmx.h"
162
163 #define FILTER4(reg) \
164 {\
165 s = src + (src_pos >> POS_FRAC_BITS);\
166 phase = get_phase(src_pos);\
167 filter = filters + phase * NB_TAPS;\
168 movq_m2r(*s, reg);\
169 punpcklbw_r2r(mm7, reg);\
170 movq_m2r(*filter, mm6);\
171 pmaddwd_r2r(reg, mm6);\
172 movq_r2r(mm6, reg);\
173 psrlq_i2r(32, reg);\
174 paddd_r2r(mm6, reg);\
175 psrad_i2r(FILTER_BITS, reg);\
176 src_pos += src_incr;\
177 }
178
179 #define DUMP(reg) movq_r2m(reg, tmp); printf(#reg "=%016"PRIx64"\n", tmp.uq);
180
181 /* XXX: do four pixels at a time */
182 static void h_resample_fast4_mmx(uint8_t *dst, int dst_width,
183 const uint8_t *src, int src_width,
184 int src_start, int src_incr, int16_t *filters)
185 {
186 int src_pos, phase;
187 const uint8_t *s;
188 int16_t *filter;
189 uint64_t tmp;
190
191 src_pos = src_start;
192 pxor_r2r(mm7, mm7);
193
194 while (dst_width >= 4) {
195
196 FILTER4(mm0);
197 FILTER4(mm1);
198 FILTER4(mm2);
199 FILTER4(mm3);
200
201 packuswb_r2r(mm7, mm0);
202 packuswb_r2r(mm7, mm1);
203 packuswb_r2r(mm7, mm3);
204 packuswb_r2r(mm7, mm2);
205 movq_r2m(mm0, tmp);
206 dst[0] = tmp & 0xFF;
207 movq_r2m(mm1, tmp);
208 dst[1] = tmp & 0xFF;
209 movq_r2m(mm2, tmp);
210 dst[2] = tmp & 0xFF;
211 movq_r2m(mm3, tmp);
212 dst[3] = tmp & 0xFF;
213 dst += 4;
214 dst_width -= 4;
215 }
216 while (dst_width > 0) {
217 FILTER4(mm0);
218 packuswb_r2r(mm7, mm0);
219 movq_r2m(mm0, tmp);
220 dst[0] = tmp & 0xFF;
221 dst++;
222 dst_width--;
223 }
224 emms();
225 }
226
227 static void v_resample4_mmx(uint8_t *dst, int dst_width, const uint8_t *src,
228 int wrap, int16_t *filter)
229 {
230 int sum, i;
231 const uint8_t *s;
232 uint64_t tmp;
233 uint64_t coefs[4];
234
235 for(i=0;i<4;i++) {
236 tmp = filter[i];
237 coefs[i] = (tmp<<48) + (tmp<<32) + (tmp<<16) + tmp;
238 }
239
240 pxor_r2r(mm7, mm7);
241 s = src;
242 while (dst_width >= 4) {
243 movq_m2r(s[0 * wrap], mm0);
244 punpcklbw_r2r(mm7, mm0);
245 movq_m2r(s[1 * wrap], mm1);
246 punpcklbw_r2r(mm7, mm1);
247 movq_m2r(s[2 * wrap], mm2);
248 punpcklbw_r2r(mm7, mm2);
249 movq_m2r(s[3 * wrap], mm3);
250 punpcklbw_r2r(mm7, mm3);
251
252 pmullw_m2r(coefs[0], mm0);
253 pmullw_m2r(coefs[1], mm1);
254 pmullw_m2r(coefs[2], mm2);
255 pmullw_m2r(coefs[3], mm3);
256
257 paddw_r2r(mm1, mm0);
258 paddw_r2r(mm3, mm2);
259 paddw_r2r(mm2, mm0);
260 psraw_i2r(FILTER_BITS, mm0);
261
262 packuswb_r2r(mm7, mm0);
263 movq_r2m(mm0, tmp);
264
265 *(uint32_t *)dst = tmp & 0xFFFFFFFF;
266 dst += 4;
267 s += 4;
268 dst_width -= 4;
269 }
270 while (dst_width > 0) {
271 sum = s[0 * wrap] * filter[0] +
272 s[1 * wrap] * filter[1] +
273 s[2 * wrap] * filter[2] +
274 s[3 * wrap] * filter[3];
275 sum = sum >> FILTER_BITS;
276 if (sum < 0)
277 sum = 0;
278 else if (sum > 255)
279 sum = 255;
280 dst[0] = sum;
281 dst++;
282 s++;
283 dst_width--;
284 }
285 emms();
286 }
287 #endif /* HAVE_MMX */
288
289 /* slow version to handle limit cases. Does not need optimization */
290 static void h_resample_slow(uint8_t *dst, int dst_width,
291 const uint8_t *src, int src_width,
292 int src_start, int src_incr, int16_t *filters)
293 {
294 int src_pos, phase, sum, j, v, i;
295 const uint8_t *s, *src_end;
296 int16_t *filter;
297
298 src_end = src + src_width;
299 src_pos = src_start;
300 for(i=0;i<dst_width;i++) {
301 s = src + (src_pos >> POS_FRAC_BITS);
302 phase = get_phase(src_pos);
303 filter = filters + phase * NB_TAPS;
304 sum = 0;
305 for(j=0;j<NB_TAPS;j++) {
306 if (s < src)
307 v = src[0];
308 else if (s >= src_end)
309 v = src_end[-1];
310 else
311 v = s[0];
312 sum += v * filter[j];
313 s++;
314 }
315 sum = sum >> FILTER_BITS;
316 if (sum < 0)
317 sum = 0;
318 else if (sum > 255)
319 sum = 255;
320 dst[0] = sum;
321 src_pos += src_incr;
322 dst++;
323 }
324 }
325
326 static void h_resample(uint8_t *dst, int dst_width, const uint8_t *src,
327 int src_width, int src_start, int src_incr,
328 int16_t *filters)
329 {
330 int n, src_end;
331
332 if (src_start < 0) {
333 n = (0 - src_start + src_incr - 1) / src_incr;
334 h_resample_slow(dst, n, src, src_width, src_start, src_incr, filters);
335 dst += n;
336 dst_width -= n;
337 src_start += n * src_incr;
338 }
339 src_end = src_start + dst_width * src_incr;
340 if (src_end > ((src_width - NB_TAPS) << POS_FRAC_BITS)) {
341 n = (((src_width - NB_TAPS + 1) << POS_FRAC_BITS) - 1 - src_start) /
342 src_incr;
343 } else {
344 n = dst_width;
345 }
346 #if HAVE_MMX
347 if ((mm_flags & FF_MM_MMX) && NB_TAPS == 4)
348 h_resample_fast4_mmx(dst, n,
349 src, src_width, src_start, src_incr, filters);
350 else
351 #endif
352 h_resample_fast(dst, n,
353 src, src_width, src_start, src_incr, filters);
354 if (n < dst_width) {
355 dst += n;
356 dst_width -= n;
357 src_start += n * src_incr;
358 h_resample_slow(dst, dst_width,
359 src, src_width, src_start, src_incr, filters);
360 }
361 }
362
363 static void component_resample(ImgReSampleContext *s,
364 uint8_t *output, int owrap, int owidth, int oheight,
365 uint8_t *input, int iwrap, int iwidth, int iheight)
366 {
367 int src_y, src_y1, last_src_y, ring_y, phase_y, y1, y;
368 uint8_t *new_line, *src_line;
369
370 last_src_y = - FCENTER - 1;
371 /* position of the bottom of the filter in the source image */
372 src_y = (last_src_y + NB_TAPS) * POS_FRAC;
373 ring_y = NB_TAPS; /* position in ring buffer */
374 for(y=0;y<oheight;y++) {
375 /* apply horizontal filter on new lines from input if needed */
376 src_y1 = src_y >> POS_FRAC_BITS;
377 while (last_src_y < src_y1) {
378 if (++ring_y >= LINE_BUF_HEIGHT + NB_TAPS)
379 ring_y = NB_TAPS;
380 last_src_y++;
381 /* handle limit conditions : replicate line (slightly
382 inefficient because we filter multiple times) */
383 y1 = last_src_y;
384 if (y1 < 0) {
385 y1 = 0;
386 } else if (y1 >= iheight) {
387 y1 = iheight - 1;
388 }
389 src_line = input + y1 * iwrap;
390 new_line = s->line_buf + ring_y * owidth;
391 /* apply filter and handle limit cases correctly */
392 h_resample(new_line, owidth,
393 src_line, iwidth, - FCENTER * POS_FRAC, s->h_incr,
394 &s->h_filters[0][0]);
395 /* handle ring buffer wrapping */
396 if (ring_y >= LINE_BUF_HEIGHT) {
397 memcpy(s->line_buf + (ring_y - LINE_BUF_HEIGHT) * owidth,
398 new_line, owidth);
399 }
400 }
401 /* apply vertical filter */
402 phase_y = get_phase(src_y);
403 #if HAVE_MMX
404 /* desactivated MMX because loss of precision */
405 if ((mm_flags & FF_MM_MMX) && NB_TAPS == 4 && 0)
406 v_resample4_mmx(output, owidth,
407 s->line_buf + (ring_y - NB_TAPS + 1) * owidth, owidth,
408 &s->v_filters[phase_y][0]);
409 else
410 #endif
411 #if HAVE_ALTIVEC
412 if ((mm_flags & FF_MM_ALTIVEC) && NB_TAPS == 4 && FILTER_BITS <= 6)
413 v_resample16_altivec(output, owidth,
414 s->line_buf + (ring_y - NB_TAPS + 1) * owidth,
415 owidth, &s->v_filters[phase_y][0]);
416 else
417 #endif
418 v_resample(output, owidth,
419 s->line_buf + (ring_y - NB_TAPS + 1) * owidth, owidth,
420 &s->v_filters[phase_y][0]);
421
422 src_y += s->v_incr;
423
424 output += owrap;
425 }
426 }
427
428 ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
429 int iwidth, int iheight,
430 int topBand, int bottomBand,
431 int leftBand, int rightBand,
432 int padtop, int padbottom,
433 int padleft, int padright)
434 {
435 ImgReSampleContext *s;
436
437 if (!owidth || !oheight || !iwidth || !iheight)
438 return NULL;
439
440 s = av_mallocz(sizeof(ImgReSampleContext));
441 if (!s)
442 return NULL;
443 if((unsigned)owidth >= UINT_MAX / (LINE_BUF_HEIGHT + NB_TAPS))
444 goto fail;
445 s->line_buf = av_mallocz(owidth * (LINE_BUF_HEIGHT + NB_TAPS));
446 if (!s->line_buf)
447 goto fail;
448
449 s->owidth = owidth;
450 s->oheight = oheight;
451 s->iwidth = iwidth;
452 s->iheight = iheight;
453
454 s->topBand = topBand;
455 s->bottomBand = bottomBand;
456 s->leftBand = leftBand;
457 s->rightBand = rightBand;
458
459 s->padtop = padtop;
460 s->padbottom = padbottom;
461 s->padleft = padleft;
462 s->padright = padright;
463
464 s->pad_owidth = owidth - (padleft + padright);
465 s->pad_oheight = oheight - (padtop + padbottom);
466
467 s->h_incr = ((iwidth - leftBand - rightBand) * POS_FRAC) / s->pad_owidth;
468 s->v_incr = ((iheight - topBand - bottomBand) * POS_FRAC) / s->pad_oheight;
469
470 av_build_filter(&s->h_filters[0][0], (float) s->pad_owidth /
471 (float) (iwidth - leftBand - rightBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);
472 av_build_filter(&s->v_filters[0][0], (float) s->pad_oheight /
473 (float) (iheight - topBand - bottomBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);
474
475 return s;
476 fail:
477 av_free(s);
478 return NULL;
479 }
480
481 ImgReSampleContext *img_resample_init(int owidth, int oheight,
482 int iwidth, int iheight)
483 {
484 return img_resample_full_init(owidth, oheight, iwidth, iheight,
485 0, 0, 0, 0, 0, 0, 0, 0);
486 }
487
488 void img_resample(ImgReSampleContext *s,
489 AVPicture *output, const AVPicture *input)
490 {
491 int i, shift;
492 uint8_t* optr;
493
494 for (i=0;i<3;i++) {
495 shift = (i == 0) ? 0 : 1;
496
497 optr = output->data[i] + (((output->linesize[i] *
498 s->padtop) + s->padleft) >> shift);
499
500 component_resample(s, optr, output->linesize[i],
501 s->pad_owidth >> shift, s->pad_oheight >> shift,
502 input->data[i] + (input->linesize[i] *
503 (s->topBand >> shift)) + (s->leftBand >> shift),
504 input->linesize[i], ((s->iwidth - s->leftBand -
505 s->rightBand) >> shift),
506 (s->iheight - s->topBand - s->bottomBand) >> shift);
507 }
508 }
509
510 void img_resample_close(ImgReSampleContext *s)
511 {
512 av_free(s->line_buf);
513 av_free(s);
514 }
515
516 static const char *context_to_name(void* ptr)
517 {
518 return "imgconvert";
519 }
520
521 static const AVClass context_class = { "imgresample", context_to_name, NULL };
522
523 struct SwsContext *sws_getContext(int srcW, int srcH, int srcFormat,
524 int dstW, int dstH, int dstFormat,
525 int flags, SwsFilter *srcFilter,
526 SwsFilter *dstFilter, double *param)
527 {
528 struct SwsContext *ctx;
529
530 ctx = av_malloc(sizeof(struct SwsContext));
531 if (!ctx) {
532 av_log(NULL, AV_LOG_ERROR, "Cannot allocate a resampling context!\n");
533
534 return NULL;
535 }
536 ctx->av_class = &context_class;
537
538 if ((srcH != dstH) || (srcW != dstW)) {
539 if ((srcFormat != PIX_FMT_YUV420P) || (dstFormat != PIX_FMT_YUV420P)) {
540 av_log(ctx, AV_LOG_INFO, "PIX_FMT_YUV420P will be used as an intermediate format for rescaling\n");
541 }
542 ctx->resampling_ctx = img_resample_init(dstW, dstH, srcW, srcH);
543 } else {
544 ctx->resampling_ctx = av_malloc(sizeof(ImgReSampleContext));
545 ctx->resampling_ctx->iheight = srcH;
546 ctx->resampling_ctx->iwidth = srcW;
547 ctx->resampling_ctx->oheight = dstH;
548 ctx->resampling_ctx->owidth = dstW;
549 }
550 ctx->src_pix_fmt = srcFormat;
551 ctx->dst_pix_fmt = dstFormat;
552
553 return ctx;
554 }
555
556 void sws_freeContext(struct SwsContext *ctx)
557 {
558 if (!ctx)
559 return;
560 if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
561 (ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
562 img_resample_close(ctx->resampling_ctx);
563 } else {
564 av_free(ctx->resampling_ctx);
565 }
566 av_free(ctx);
567 }
568
569
570 /**
571 * Checks if context is valid or reallocs a new one instead.
572 * If context is NULL, just calls sws_getContext() to get a new one.
573 * Otherwise, checks if the parameters are the same already saved in context.
574 * If that is the case, returns the current context.
575 * Otherwise, frees context and gets a new one.
576 *
577 * Be warned that srcFilter, dstFilter are not checked, they are
578 * assumed to remain valid.
579 */
580 struct SwsContext *sws_getCachedContext(struct SwsContext *ctx,
581 int srcW, int srcH, int srcFormat,
582 int dstW, int dstH, int dstFormat, int flags,
583 SwsFilter *srcFilter, SwsFilter *dstFilter, double *param)
584 {
585 if (ctx != NULL) {
586 if ((ctx->resampling_ctx->iwidth != srcW) ||
587 (ctx->resampling_ctx->iheight != srcH) ||
588 (ctx->src_pix_fmt != srcFormat) ||
589 (ctx->resampling_ctx->owidth != dstW) ||
590 (ctx->resampling_ctx->oheight != dstH) ||
591 (ctx->dst_pix_fmt != dstFormat))
592 {
593 sws_freeContext(ctx);
594 ctx = NULL;
595 }
596 }
597 if (ctx == NULL) {
598 return sws_getContext(srcW, srcH, srcFormat,
599 dstW, dstH, dstFormat, flags,
600 srcFilter, dstFilter, param);
601 }
602 return ctx;
603 }
604
605 int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
606 int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[])
607 {
608 AVPicture src_pict, dst_pict;
609 int i, res = 0;
610 AVPicture picture_format_temp;
611 AVPicture picture_resample_temp, *formatted_picture, *resampled_picture;
612 uint8_t *buf1 = NULL, *buf2 = NULL;
613 enum PixelFormat current_pix_fmt;
614
615 for (i = 0; i < 4; i++) {
616 src_pict.data[i] = src[i];
617 src_pict.linesize[i] = srcStride[i];
618 dst_pict.data[i] = dst[i];
619 dst_pict.linesize[i] = dstStride[i];
620 }
621 if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
622 (ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
623 /* We have to rescale the picture, but only YUV420P rescaling is supported... */
624
625 if (ctx->src_pix_fmt != PIX_FMT_YUV420P) {
626 int size;
627
628 /* create temporary picture for rescaling input*/
629 size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
630 buf1 = av_malloc(size);
631 if (!buf1) {
632 res = -1;
633 goto the_end;
634 }
635 formatted_picture = &picture_format_temp;
636 avpicture_fill((AVPicture*)formatted_picture, buf1,
637 PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
638
639 if (img_convert((AVPicture*)formatted_picture, PIX_FMT_YUV420P,
640 &src_pict, ctx->src_pix_fmt,
641 ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight) < 0) {
642
643 av_log(ctx, AV_LOG_ERROR, "pixel format conversion not handled\n");
644 res = -1;
645 goto the_end;
646 }
647 } else {
648 formatted_picture = &src_pict;
649 }
650
651 if (ctx->dst_pix_fmt != PIX_FMT_YUV420P) {
652 int size;
653
654 /* create temporary picture for rescaling output*/
655 size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
656 buf2 = av_malloc(size);
657 if (!buf2) {
658 res = -1;
659 goto the_end;
660 }
661 resampled_picture = &picture_resample_temp;
662 avpicture_fill((AVPicture*)resampled_picture, buf2,
663 PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
664
665 } else {
666 resampled_picture = &dst_pict;
667 }
668
669 /* ...and finally rescale!!! */
670 img_resample(ctx->resampling_ctx, resampled_picture, formatted_picture);
671 current_pix_fmt = PIX_FMT_YUV420P;
672 } else {
673 resampled_picture = &src_pict;
674 current_pix_fmt = ctx->src_pix_fmt;
675 }
676
677 if (current_pix_fmt != ctx->dst_pix_fmt) {
678 if (img_convert(&dst_pict, ctx->dst_pix_fmt,
679 resampled_picture, current_pix_fmt,
680 ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight) < 0) {
681
682 av_log(ctx, AV_LOG_ERROR, "pixel format conversion not handled\n");
683
684 res = -1;
685 goto the_end;
686 }
687 } else if (resampled_picture != &dst_pict) {
688 av_picture_copy(&dst_pict, resampled_picture, current_pix_fmt,
689 ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
690 }
691
692 the_end:
693 av_free(buf1);
694 av_free(buf2);
695 return res;
696 }
697
698
699 #ifdef TEST
700 #include <stdio.h>
701 #undef exit
702
703 /* input */
704 #define XSIZE 256
705 #define YSIZE 256
706 uint8_t img[XSIZE * YSIZE];
707
708 /* output */
709 #define XSIZE1 512
710 #define YSIZE1 512
711 uint8_t img1[XSIZE1 * YSIZE1];
712 uint8_t img2[XSIZE1 * YSIZE1];
713
714 void save_pgm(const char *filename, uint8_t *img, int xsize, int ysize)
715 {
716 #undef fprintf
717 FILE *f;
718 f=fopen(filename,"w");
719 fprintf(f,"P5\n%d %d\n%d\n", xsize, ysize, 255);
720 fwrite(img,1, xsize * ysize,f);
721 fclose(f);
722 #define fprintf please_use_av_log
723 }
724
725 static void dump_filter(int16_t *filter)
726 {
727 int i, ph;
728
729 for(ph=0;ph<NB_PHASES;ph++) {
730 av_log(NULL, AV_LOG_INFO, "%2d: ", ph);
731 for(i=0;i<NB_TAPS;i++) {
732 av_log(NULL, AV_LOG_INFO, " %5.2f", filter[ph * NB_TAPS + i] / 256.0);
733 }
734 av_log(NULL, AV_LOG_INFO, "\n");
735 }
736 }
737
738 #if HAVE_MMX
739 int mm_flags;
740 #endif
741
742 int main(int argc, char **argv)
743 {
744 int x, y, v, i, xsize, ysize;
745 ImgReSampleContext *s;
746 float fact, factors[] = { 1/2.0, 3.0/4.0, 1.0, 4.0/3.0, 16.0/9.0, 2.0 };
747 char buf[256];
748
749 /* build test image */
750 for(y=0;y<YSIZE;y++) {
751 for(x=0;x<XSIZE;x++) {
752 if (x < XSIZE/2 && y < YSIZE/2) {
753 if (x < XSIZE/4 && y < YSIZE/4) {
754 if ((x % 10) <= 6 &&
755 (y % 10) <= 6)
756 v = 0xff;
757 else
758 v = 0x00;
759 } else if (x < XSIZE/4) {
760 if (x & 1)
761 v = 0xff;
762 else
763 v = 0;
764 } else if (y < XSIZE/4) {
765 if (y & 1)
766 v = 0xff;
767 else
768 v = 0;
769 } else {
770 if (y < YSIZE*3/8) {
771 if ((y+x) & 1)
772 v = 0xff;
773 else
774 v = 0;
775 } else {
776 if (((x+3) % 4) <= 1 &&
777 ((y+3) % 4) <= 1)
778 v = 0xff;
779 else
780 v = 0x00;
781 }
782 }
783 } else if (x < XSIZE/2) {
784 v = ((x - (XSIZE/2)) * 255) / (XSIZE/2);
785 } else if (y < XSIZE/2) {
786 v = ((y - (XSIZE/2)) * 255) / (XSIZE/2);
787 } else {
788 v = ((x + y - XSIZE) * 255) / XSIZE;
789 }
790 img[(YSIZE - y) * XSIZE + (XSIZE - x)] = v;
791 }
792 }
793 save_pgm("/tmp/in.pgm", img, XSIZE, YSIZE);
794 for(i=0;i<FF_ARRAY_ELEMS(factors);i++) {
795 fact = factors[i];
796 xsize = (int)(XSIZE * fact);
797 ysize = (int)((YSIZE - 100) * fact);
798 s = img_resample_full_init(xsize, ysize, XSIZE, YSIZE, 50 ,50, 0, 0, 0, 0, 0, 0);
799 av_log(NULL, AV_LOG_INFO, "Factor=%0.2f\n", fact);
800 dump_filter(&s->h_filters[0][0]);
801 component_resample(s, img1, xsize, xsize, ysize,
802 img + 50 * XSIZE, XSIZE, XSIZE, YSIZE - 100);
803 img_resample_close(s);
804
805 snprintf(buf, sizeof(buf), "/tmp/out%d.pgm", i);
806 save_pgm(buf, img1, xsize, ysize);
807 }
808
809 /* mmx test */
810 #if HAVE_MMX
811 av_log(NULL, AV_LOG_INFO, "MMX test\n");
812 fact = 0.72;
813 xsize = (int)(XSIZE * fact);
814 ysize = (int)(YSIZE * fact);
815 mm_flags = FF_MM_MMX;
816 s = img_resample_init(xsize, ysize, XSIZE, YSIZE);
817 component_resample(s, img1, xsize, xsize, ysize,
818 img, XSIZE, XSIZE, YSIZE);
819
820 mm_flags = 0;
821 s = img_resample_init(xsize, ysize, XSIZE, YSIZE);
822 component_resample(s, img2, xsize, xsize, ysize,
823 img, XSIZE, XSIZE, YSIZE);
824 if (memcmp(img1, img2, xsize * ysize) != 0) {
825 av_log(NULL, AV_LOG_ERROR, "mmx error\n");
826 exit(1);
827 }
828 av_log(NULL, AV_LOG_INFO, "MMX OK\n");
829 #endif /* HAVE_MMX */
830 return 0;
831 }
832
833 #endif /* TEST */