FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
imgconvert.c
Go to the documentation of this file.
1 /*
2  * Misc image conversion routines
3  * Copyright (c) 2001, 2002, 2003 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
24  * misc image conversion routines
25  */
26 
27 /* TODO:
28  * - write 'ffimg' program to test all the image related stuff
29  * - move all api to slice based system
30  * - integrate deinterlacing, postprocessing and scaling in the conversion process
31  */
32 
33 #include "avcodec.h"
34 #include "dsputil.h"
35 #include "imgconvert.h"
36 #include "internal.h"
37 #include "libavutil/avassert.h"
38 #include "libavutil/colorspace.h"
39 #include "libavutil/common.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/imgutils.h"
42 
43 #if HAVE_MMX_EXTERNAL
44 #include "x86/dsputil_x86.h"
45 #endif
46 
47 #define FF_COLOR_NA -1
48 #define FF_COLOR_RGB 0 /**< RGB color space */
49 #define FF_COLOR_GRAY 1 /**< gray color space */
50 #define FF_COLOR_YUV 2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
51 #define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
52 
53 #if HAVE_MMX_EXTERNAL
54 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
55 #define deinterlace_line ff_deinterlace_line_mmx
56 #else
57 #define deinterlace_line_inplace deinterlace_line_inplace_c
58 #define deinterlace_line deinterlace_line_c
59 #endif
60 
61 #define pixdesc_has_alpha(pixdesc) \
62  ((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)
63 
64 
65 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
66 {
67  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
68  av_assert0(desc);
69  *h_shift = desc->log2_chroma_w;
70  *v_shift = desc->log2_chroma_h;
71 }
72 
73 static int get_color_type(const AVPixFmtDescriptor *desc) {
74  if (desc->flags & AV_PIX_FMT_FLAG_PAL)
75  return FF_COLOR_RGB;
76 
77  if(desc->nb_components == 1 || desc->nb_components == 2)
78  return FF_COLOR_GRAY;
79 
80  if(desc->name && !strncmp(desc->name, "yuvj", 4))
81  return FF_COLOR_YUV_JPEG;
82 
83  if(desc->flags & AV_PIX_FMT_FLAG_RGB)
84  return FF_COLOR_RGB;
85 
86  if(desc->nb_components == 0)
87  return FF_COLOR_NA;
88 
89  return FF_COLOR_YUV;
90 }
91 
92 static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
93 {
94  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
95  int i;
96 
97  if (!desc || !desc->nb_components) {
98  *min = *max = 0;
99  return AVERROR(EINVAL);
100  }
101 
102  *min = INT_MAX, *max = -INT_MAX;
103  for (i = 0; i < desc->nb_components; i++) {
104  *min = FFMIN(desc->comp[i].depth_minus1+1, *min);
105  *max = FFMAX(desc->comp[i].depth_minus1+1, *max);
106  }
107  return 0;
108 }
109 
110 static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,
111  enum AVPixelFormat src_pix_fmt,
112  unsigned *lossp, unsigned consider)
113 {
114  const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
115  const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
116  int src_color, dst_color;
117  int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
118  int ret, loss, i, nb_components;
119  int score = INT_MAX - 1;
120 
121  if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
122  return ~0;
123 
124  /* compute loss */
125  *lossp = loss = 0;
126 
127  if (dst_pix_fmt == src_pix_fmt)
128  return INT_MAX;
129 
130  if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
131  return ret;
132  if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
133  return ret;
134 
135  src_color = get_color_type(src_desc);
136  dst_color = get_color_type(dst_desc);
137  nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
138 
139  for (i = 0; i < nb_components; i++)
140  if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1 && (consider & FF_LOSS_DEPTH)) {
141  loss |= FF_LOSS_DEPTH;
142  score -= 65536 >> dst_desc->comp[i].depth_minus1;
143  }
144 
145  if (consider & FF_LOSS_RESOLUTION) {
146  if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w) {
147  loss |= FF_LOSS_RESOLUTION;
148  score -= 256 << dst_desc->log2_chroma_w;
149  }
150  if (dst_desc->log2_chroma_h > src_desc->log2_chroma_h) {
151  loss |= FF_LOSS_RESOLUTION;
152  score -= 256 << dst_desc->log2_chroma_h;
153  }
154  // don't favor 422 over 420 if downsampling is needed, because 420 has much better support on the decoder side
155  if (dst_desc->log2_chroma_w == 1 && src_desc->log2_chroma_w == 0 &&
156  dst_desc->log2_chroma_h == 1 && src_desc->log2_chroma_h == 0 ) {
157  score += 512;
158  }
159  }
160 
161  if(consider & FF_LOSS_COLORSPACE)
162  switch(dst_color) {
163  case FF_COLOR_RGB:
164  if (src_color != FF_COLOR_RGB &&
165  src_color != FF_COLOR_GRAY)
166  loss |= FF_LOSS_COLORSPACE;
167  break;
168  case FF_COLOR_GRAY:
169  if (src_color != FF_COLOR_GRAY)
170  loss |= FF_LOSS_COLORSPACE;
171  break;
172  case FF_COLOR_YUV:
173  if (src_color != FF_COLOR_YUV)
174  loss |= FF_LOSS_COLORSPACE;
175  break;
176  case FF_COLOR_YUV_JPEG:
177  if (src_color != FF_COLOR_YUV_JPEG &&
178  src_color != FF_COLOR_YUV &&
179  src_color != FF_COLOR_GRAY)
180  loss |= FF_LOSS_COLORSPACE;
181  break;
182  default:
183  /* fail safe test */
184  if (src_color != dst_color)
185  loss |= FF_LOSS_COLORSPACE;
186  break;
187  }
188  if(loss & FF_LOSS_COLORSPACE)
189  score -= (nb_components * 65536) >> FFMIN(dst_desc->comp[0].depth_minus1, src_desc->comp[0].depth_minus1);
190 
191  if (dst_color == FF_COLOR_GRAY &&
192  src_color != FF_COLOR_GRAY && (consider & FF_LOSS_CHROMA)) {
193  loss |= FF_LOSS_CHROMA;
194  score -= 2 * 65536;
195  }
196  if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))) {
197  loss |= FF_LOSS_ALPHA;
198  score -= 65536;
199  }
200  if (dst_pix_fmt == AV_PIX_FMT_PAL8 && (consider & FF_LOSS_COLORQUANT) &&
201  (src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))))) {
202  loss |= FF_LOSS_COLORQUANT;
203  score -= 65536;
204  }
205 
206  *lossp = loss;
207  return score;
208 }
209 
210 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
211  enum AVPixelFormat src_pix_fmt,
212  int has_alpha)
213 {
214  int loss;
215  int ret = get_pix_fmt_score(dst_pix_fmt, src_pix_fmt, &loss, has_alpha ? ~0 : ~FF_LOSS_ALPHA);
216  if (ret < 0)
217  return ret;
218  return loss;
219 }
220 
221 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
222  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
223 {
224  enum AVPixelFormat dst_pix_fmt;
225  int loss1, loss2, loss_mask;
226  const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
227  const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
228  int score1, score2;
229 
230  loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
231  if(!has_alpha)
232  loss_mask &= ~FF_LOSS_ALPHA;
233 
234  dst_pix_fmt = AV_PIX_FMT_NONE;
235  score1 = get_pix_fmt_score(dst_pix_fmt1, src_pix_fmt, &loss1, loss_mask);
236  score2 = get_pix_fmt_score(dst_pix_fmt2, src_pix_fmt, &loss2, loss_mask);
237 
238  if (score1 == score2) {
239  if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
240  dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
241  } else {
242  dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
243  }
244  } else {
245  dst_pix_fmt = score1 < score2 ? dst_pix_fmt2 : dst_pix_fmt1;
246  }
247 
248  if (loss_ptr)
249  *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
250  return dst_pix_fmt;
251 }
252 
253 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
254 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
255  enum AVPixelFormat src_pix_fmt,
256  int has_alpha, int *loss_ptr){
257  return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
258 }
259 #else
260 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
261  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
262 {
263  return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
264 }
265 #endif
266 
267 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
268  enum AVPixelFormat src_pix_fmt,
269  int has_alpha, int *loss_ptr){
270  int i;
271 
272  enum AVPixelFormat best = AV_PIX_FMT_NONE;
273 
274  for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
275  best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
276 
277  return best;
278 }
279 
280 /* 2x2 -> 1x1 */
281 void ff_shrink22(uint8_t *dst, int dst_wrap,
282  const uint8_t *src, int src_wrap,
283  int width, int height)
284 {
285  int w;
286  const uint8_t *s1, *s2;
287  uint8_t *d;
288 
289  for(;height > 0; height--) {
290  s1 = src;
291  s2 = s1 + src_wrap;
292  d = dst;
293  for(w = width;w >= 4; w-=4) {
294  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
295  d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
296  d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
297  d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
298  s1 += 8;
299  s2 += 8;
300  d += 4;
301  }
302  for(;w > 0; w--) {
303  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
304  s1 += 2;
305  s2 += 2;
306  d++;
307  }
308  src += 2 * src_wrap;
309  dst += dst_wrap;
310  }
311 }
312 
313 /* 4x4 -> 1x1 */
314 void ff_shrink44(uint8_t *dst, int dst_wrap,
315  const uint8_t *src, int src_wrap,
316  int width, int height)
317 {
318  int w;
319  const uint8_t *s1, *s2, *s3, *s4;
320  uint8_t *d;
321 
322  for(;height > 0; height--) {
323  s1 = src;
324  s2 = s1 + src_wrap;
325  s3 = s2 + src_wrap;
326  s4 = s3 + src_wrap;
327  d = dst;
328  for(w = width;w > 0; w--) {
329  d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
330  s2[0] + s2[1] + s2[2] + s2[3] +
331  s3[0] + s3[1] + s3[2] + s3[3] +
332  s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
333  s1 += 4;
334  s2 += 4;
335  s3 += 4;
336  s4 += 4;
337  d++;
338  }
339  src += 4 * src_wrap;
340  dst += dst_wrap;
341  }
342 }
343 
344 /* 8x8 -> 1x1 */
345 void ff_shrink88(uint8_t *dst, int dst_wrap,
346  const uint8_t *src, int src_wrap,
347  int width, int height)
348 {
349  int w, i;
350 
351  for(;height > 0; height--) {
352  for(w = width;w > 0; w--) {
353  int tmp=0;
354  for(i=0; i<8; i++){
355  tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
356  src += src_wrap;
357  }
358  *(dst++) = (tmp + 32)>>6;
359  src += 8 - 8*src_wrap;
360  }
361  src += 8*src_wrap - 8*width;
362  dst += dst_wrap - width;
363  }
364 }
365 
366 /* return true if yuv planar */
367 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
368 {
369  int i;
370  int planes[4] = { 0 };
371 
372  if ( desc->flags & AV_PIX_FMT_FLAG_RGB
373  || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
374  return 0;
375 
376  /* set the used planes */
377  for (i = 0; i < desc->nb_components; i++)
378  planes[desc->comp[i].plane] = 1;
379 
380  /* if there is an unused plane, the format is not planar */
381  for (i = 0; i < desc->nb_components; i++)
382  if (!planes[i])
383  return 0;
384  return 1;
385 }
386 
387 int av_picture_crop(AVPicture *dst, const AVPicture *src,
388  enum AVPixelFormat pix_fmt, int top_band, int left_band)
389 {
390  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
391  int y_shift;
392  int x_shift;
393 
394  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
395  return -1;
396 
397  y_shift = desc->log2_chroma_h;
398  x_shift = desc->log2_chroma_w;
399 
400  if (is_yuv_planar(desc)) {
401  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
402  dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
403  dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
404  } else{
405  if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
406  return -1;
407  if(left_band) //FIXME add support for this too
408  return -1;
409  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
410  }
411 
412  dst->linesize[0] = src->linesize[0];
413  dst->linesize[1] = src->linesize[1];
414  dst->linesize[2] = src->linesize[2];
415  return 0;
416 }
417 
418 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
419  enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
420  int *color)
421 {
422  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
423  uint8_t *optr;
424  int y_shift;
425  int x_shift;
426  int yheight;
427  int i, y;
428 
429  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
430  !is_yuv_planar(desc)) return -1;
431 
432  for (i = 0; i < 3; i++) {
433  x_shift = i ? desc->log2_chroma_w : 0;
434  y_shift = i ? desc->log2_chroma_h : 0;
435 
436  if (padtop || padleft) {
437  memset(dst->data[i], color[i],
438  dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
439  }
440 
441  if (padleft || padright) {
442  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
443  (dst->linesize[i] - (padright >> x_shift));
444  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
445  for (y = 0; y < yheight; y++) {
446  memset(optr, color[i], (padleft + padright) >> x_shift);
447  optr += dst->linesize[i];
448  }
449  }
450 
451  if (src) { /* first line */
452  uint8_t *iptr = src->data[i];
453  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
454  (padleft >> x_shift);
455  memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
456  iptr += src->linesize[i];
457  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
458  (dst->linesize[i] - (padright >> x_shift));
459  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
460  for (y = 0; y < yheight; y++) {
461  memset(optr, color[i], (padleft + padright) >> x_shift);
462  memcpy(optr + ((padleft + padright) >> x_shift), iptr,
463  (width - padleft - padright) >> x_shift);
464  iptr += src->linesize[i];
465  optr += dst->linesize[i];
466  }
467  }
468 
469  if (padbottom || padright) {
470  optr = dst->data[i] + dst->linesize[i] *
471  ((height - padbottom) >> y_shift) - (padright >> x_shift);
472  memset(optr, color[i],dst->linesize[i] *
473  (padbottom >> y_shift) + (padright >> x_shift));
474  }
475  }
476  return 0;
477 }
478 
479 #if FF_API_DEINTERLACE
480 
481 #if !HAVE_MMX_EXTERNAL
482 /* filter parameters: [-1 4 2 4 -1] // 8 */
483 static void deinterlace_line_c(uint8_t *dst,
484  const uint8_t *lum_m4, const uint8_t *lum_m3,
485  const uint8_t *lum_m2, const uint8_t *lum_m1,
486  const uint8_t *lum,
487  int size)
488 {
489  const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
490  int sum;
491 
492  for(;size > 0;size--) {
493  sum = -lum_m4[0];
494  sum += lum_m3[0] << 2;
495  sum += lum_m2[0] << 1;
496  sum += lum_m1[0] << 2;
497  sum += -lum[0];
498  dst[0] = cm[(sum + 4) >> 3];
499  lum_m4++;
500  lum_m3++;
501  lum_m2++;
502  lum_m1++;
503  lum++;
504  dst++;
505  }
506 }
507 
508 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
509  uint8_t *lum_m2, uint8_t *lum_m1,
510  uint8_t *lum, int size)
511 {
512  const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
513  int sum;
514 
515  for(;size > 0;size--) {
516  sum = -lum_m4[0];
517  sum += lum_m3[0] << 2;
518  sum += lum_m2[0] << 1;
519  lum_m4[0]=lum_m2[0];
520  sum += lum_m1[0] << 2;
521  sum += -lum[0];
522  lum_m2[0] = cm[(sum + 4) >> 3];
523  lum_m4++;
524  lum_m3++;
525  lum_m2++;
526  lum_m1++;
527  lum++;
528  }
529 }
530 #endif /* !HAVE_MMX_EXTERNAL */
531 
532 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
533  top field is copied as is, but the bottom field is deinterlaced
534  against the top field. */
535 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
536  const uint8_t *src1, int src_wrap,
537  int width, int height)
538 {
539  const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
540  int y;
541 
542  src_m2 = src1;
543  src_m1 = src1;
544  src_0=&src_m1[src_wrap];
545  src_p1=&src_0[src_wrap];
546  src_p2=&src_p1[src_wrap];
547  for(y=0;y<(height-2);y+=2) {
548  memcpy(dst,src_m1,width);
549  dst += dst_wrap;
550  deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
551  src_m2 = src_0;
552  src_m1 = src_p1;
553  src_0 = src_p2;
554  src_p1 += 2*src_wrap;
555  src_p2 += 2*src_wrap;
556  dst += dst_wrap;
557  }
558  memcpy(dst,src_m1,width);
559  dst += dst_wrap;
560  /* do last line */
561  deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
562 }
563 
564 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
565  int width, int height)
566 {
567  uint8_t *src_m1, *src_0, *src_p1, *src_p2;
568  int y;
569  uint8_t *buf;
570  buf = av_malloc(width);
571 
572  src_m1 = src1;
573  memcpy(buf,src_m1,width);
574  src_0=&src_m1[src_wrap];
575  src_p1=&src_0[src_wrap];
576  src_p2=&src_p1[src_wrap];
577  for(y=0;y<(height-2);y+=2) {
578  deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
579  src_m1 = src_p1;
580  src_0 = src_p2;
581  src_p1 += 2*src_wrap;
582  src_p2 += 2*src_wrap;
583  }
584  /* do last line */
585  deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
586  av_free(buf);
587 }
588 
589 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
590  enum AVPixelFormat pix_fmt, int width, int height)
591 {
592  int i;
593 
594  if (pix_fmt != AV_PIX_FMT_YUV420P &&
595  pix_fmt != AV_PIX_FMT_YUVJ420P &&
596  pix_fmt != AV_PIX_FMT_YUV422P &&
597  pix_fmt != AV_PIX_FMT_YUVJ422P &&
598  pix_fmt != AV_PIX_FMT_YUV444P &&
599  pix_fmt != AV_PIX_FMT_YUV411P &&
600  pix_fmt != AV_PIX_FMT_GRAY8)
601  return -1;
602  if ((width & 3) != 0 || (height & 3) != 0)
603  return -1;
604 
605  for(i=0;i<3;i++) {
606  if (i == 1) {
607  switch(pix_fmt) {
608  case AV_PIX_FMT_YUVJ420P:
609  case AV_PIX_FMT_YUV420P:
610  width >>= 1;
611  height >>= 1;
612  break;
613  case AV_PIX_FMT_YUV422P:
614  case AV_PIX_FMT_YUVJ422P:
615  width >>= 1;
616  break;
617  case AV_PIX_FMT_YUV411P:
618  width >>= 2;
619  break;
620  default:
621  break;
622  }
623  if (pix_fmt == AV_PIX_FMT_GRAY8) {
624  break;
625  }
626  }
627  if (src == dst) {
628  deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
629  width, height);
630  } else {
631  deinterlace_bottom_field(dst->data[i],dst->linesize[i],
632  src->data[i], src->linesize[i],
633  width, height);
634  }
635  }
636  emms_c();
637  return 0;
638 }
639 
640 #endif /* FF_API_DEINTERLACE */
641 
642 #ifdef TEST
643 
644 int main(void){
645  int i;
646  int err=0;
647  int skip = 0;
648 
649  for (i=0; i<AV_PIX_FMT_NB*2; i++) {
650  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
651  if(!desc || !desc->name) {
652  skip ++;
653  continue;
654  }
655  if (skip) {
656  av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
657  skip = 0;
658  }
659  av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d colortype:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc), get_color_type(desc));
660  if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
661  av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
662  err = 1;
663  }
664  }
665  return err;
666 }
667 
668 #endif
Generated on Sat Jan 25 2014 19:51:49 for FFmpeg by   doxygen 1.8.2