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imgconvert.c
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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 "internal.h"
36 #include "libavutil/avassert.h"
37 #include "libavutil/colorspace.h"
38 #include "libavutil/common.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavutil/imgutils.h"
41 
42 #if HAVE_MMX_EXTERNAL
43 #include "x86/dsputil_mmx.h"
44 #endif
45 
46 #define FF_COLOR_NA -1
47 #define FF_COLOR_RGB 0 /**< RGB color space */
48 #define FF_COLOR_GRAY 1 /**< gray color space */
49 #define FF_COLOR_YUV 2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
50 #define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
51 
52 #if HAVE_MMX_EXTERNAL
53 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
54 #define deinterlace_line ff_deinterlace_line_mmx
55 #else
56 #define deinterlace_line_inplace deinterlace_line_inplace_c
57 #define deinterlace_line deinterlace_line_c
58 #endif
59 
60 #define pixdesc_has_alpha(pixdesc) \
61  ((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & PIX_FMT_PAL)
62 
63 
64 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
65 {
66  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
67  av_assert0(desc);
68  *h_shift = desc->log2_chroma_w;
69  *v_shift = desc->log2_chroma_h;
70 }
71 
72 static int get_color_type(const AVPixFmtDescriptor *desc) {
73  if(desc->nb_components == 1 || desc->nb_components == 2)
74  return FF_COLOR_GRAY;
75 
76  if(desc->name && !strncmp(desc->name, "yuvj", 4))
77  return FF_COLOR_YUV_JPEG;
78 
79  if(desc->flags & PIX_FMT_RGB)
80  return FF_COLOR_RGB;
81 
82  if(desc->nb_components == 0)
83  return FF_COLOR_NA;
84 
85  return FF_COLOR_YUV;
86 }
87 
88 static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
89 {
90  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
91  int i;
92 
93  if (!desc || !desc->nb_components) {
94  *min = *max = 0;
95  return AVERROR(EINVAL);
96  }
97 
98  *min = INT_MAX, *max = -INT_MAX;
99  for (i = 0; i < desc->nb_components; i++) {
100  *min = FFMIN(desc->comp[i].depth_minus1+1, *min);
101  *max = FFMAX(desc->comp[i].depth_minus1+1, *max);
102  }
103  return 0;
104 }
105 
106 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
107  enum AVPixelFormat src_pix_fmt,
108  int has_alpha)
109 {
110  const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
111  const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
112  int src_color, dst_color;
113  int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
114  int ret, loss, i, nb_components;
115 
116  if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
117  return ~0;
118 
119  /* compute loss */
120  loss = 0;
121 
122  if (dst_pix_fmt == src_pix_fmt)
123  return 0;
124 
125  if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
126  return ret;
127  if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
128  return ret;
129 
130  src_color = get_color_type(src_desc);
131  dst_color = get_color_type(dst_desc);
132  nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
133 
134  for (i = 0; i < nb_components; i++)
135  if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1)
136  loss |= FF_LOSS_DEPTH;
137 
138  if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
139  dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
140  loss |= FF_LOSS_RESOLUTION;
141 
142  switch(dst_color) {
143  case FF_COLOR_RGB:
144  if (src_color != FF_COLOR_RGB &&
145  src_color != FF_COLOR_GRAY)
146  loss |= FF_LOSS_COLORSPACE;
147  break;
148  case FF_COLOR_GRAY:
149  if (src_color != FF_COLOR_GRAY)
150  loss |= FF_LOSS_COLORSPACE;
151  break;
152  case FF_COLOR_YUV:
153  if (src_color != FF_COLOR_YUV)
154  loss |= FF_LOSS_COLORSPACE;
155  break;
156  case FF_COLOR_YUV_JPEG:
157  if (src_color != FF_COLOR_YUV_JPEG &&
158  src_color != FF_COLOR_YUV &&
159  src_color != FF_COLOR_GRAY)
160  loss |= FF_LOSS_COLORSPACE;
161  break;
162  default:
163  /* fail safe test */
164  if (src_color != dst_color)
165  loss |= FF_LOSS_COLORSPACE;
166  break;
167  }
168  if (dst_color == FF_COLOR_GRAY &&
169  src_color != FF_COLOR_GRAY)
170  loss |= FF_LOSS_CHROMA;
171  if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && has_alpha))
172  loss |= FF_LOSS_ALPHA;
173  if (dst_pix_fmt == AV_PIX_FMT_PAL8 &&
174  (src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && has_alpha))))
175  loss |= FF_LOSS_COLORQUANT;
176 
177  return loss;
178 }
179 
180 #if FF_API_FIND_BEST_PIX_FMT
181 enum AVPixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum AVPixelFormat src_pix_fmt,
182  int has_alpha, int *loss_ptr)
183 {
184  enum AVPixelFormat dst_pix_fmt;
185  int i;
186 
187  if (loss_ptr) /* all losses count (for backward compatibility) */
188  *loss_ptr = 0;
189 
190  dst_pix_fmt = AV_PIX_FMT_NONE; /* so first iteration doesn't have to be treated special */
191  for(i = 0; i< FFMIN(AV_PIX_FMT_NB, 64); i++){
192  if (pix_fmt_mask & (1ULL << i))
193  dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, i, src_pix_fmt, has_alpha, loss_ptr);
194  }
195  return dst_pix_fmt;
196 }
197 #endif /* FF_API_FIND_BEST_PIX_FMT */
198 
199 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
200  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
201 {
202  enum AVPixelFormat dst_pix_fmt;
203  int loss1, loss2, loss_order1, loss_order2, i, loss_mask;
204  const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
205  const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
206  static const int loss_mask_order[] = {
207  ~0, /* no loss first */
208  ~FF_LOSS_ALPHA,
209  ~FF_LOSS_RESOLUTION,
210  ~FF_LOSS_COLORSPACE,
211  ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
212  ~FF_LOSS_COLORQUANT,
213  ~FF_LOSS_DEPTH,
214  ~(FF_LOSS_DEPTH|FF_LOSS_COLORSPACE),
215  ~(FF_LOSS_RESOLUTION | FF_LOSS_DEPTH | FF_LOSS_COLORSPACE | FF_LOSS_ALPHA |
216  FF_LOSS_COLORQUANT | FF_LOSS_CHROMA),
217  0x80000, //non zero entry that combines all loss variants including future additions
218  0,
219  };
220 
221  loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
222  dst_pix_fmt = AV_PIX_FMT_NONE;
223  loss1 = avcodec_get_pix_fmt_loss(dst_pix_fmt1, src_pix_fmt, has_alpha) & loss_mask;
224  loss2 = avcodec_get_pix_fmt_loss(dst_pix_fmt2, src_pix_fmt, has_alpha) & loss_mask;
225 
226  /* try with successive loss */
227  for(i = 0;loss_mask_order[i] != 0 && dst_pix_fmt == AV_PIX_FMT_NONE;i++) {
228  loss_order1 = loss1 & loss_mask_order[i];
229  loss_order2 = loss2 & loss_mask_order[i];
230 
231  if (loss_order1 == 0 && loss_order2 == 0 && dst_pix_fmt2 != AV_PIX_FMT_NONE && dst_pix_fmt1 != AV_PIX_FMT_NONE){ /* use format with smallest depth */
232  if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
233  dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
234  } else {
235  dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
236  }
237  } else if (loss_order1 == 0 || loss_order2 == 0) { /* use format with no loss */
238  dst_pix_fmt = loss_order2 ? dst_pix_fmt1 : dst_pix_fmt2;
239  }
240  }
241 
242  if (loss_ptr)
243  *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
244  return dst_pix_fmt;
245 }
246 
247 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
248 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
249  enum AVPixelFormat src_pix_fmt,
250  int has_alpha, int *loss_ptr){
251  return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
252 }
253 #else
254 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
255  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
256 {
257  return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
258 }
259 #endif
260 
261 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(enum AVPixelFormat *pix_fmt_list,
262  enum AVPixelFormat src_pix_fmt,
263  int has_alpha, int *loss_ptr){
264  int i;
265 
266  enum AVPixelFormat best = AV_PIX_FMT_NONE;
267 
268  for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
269  best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
270 
271  return best;
272 }
273 
274 /* 2x2 -> 1x1 */
275 void ff_shrink22(uint8_t *dst, int dst_wrap,
276  const uint8_t *src, int src_wrap,
277  int width, int height)
278 {
279  int w;
280  const uint8_t *s1, *s2;
281  uint8_t *d;
282 
283  for(;height > 0; height--) {
284  s1 = src;
285  s2 = s1 + src_wrap;
286  d = dst;
287  for(w = width;w >= 4; w-=4) {
288  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
289  d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
290  d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
291  d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
292  s1 += 8;
293  s2 += 8;
294  d += 4;
295  }
296  for(;w > 0; w--) {
297  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
298  s1 += 2;
299  s2 += 2;
300  d++;
301  }
302  src += 2 * src_wrap;
303  dst += dst_wrap;
304  }
305 }
306 
307 /* 4x4 -> 1x1 */
308 void ff_shrink44(uint8_t *dst, int dst_wrap,
309  const uint8_t *src, int src_wrap,
310  int width, int height)
311 {
312  int w;
313  const uint8_t *s1, *s2, *s3, *s4;
314  uint8_t *d;
315 
316  for(;height > 0; height--) {
317  s1 = src;
318  s2 = s1 + src_wrap;
319  s3 = s2 + src_wrap;
320  s4 = s3 + src_wrap;
321  d = dst;
322  for(w = width;w > 0; w--) {
323  d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
324  s2[0] + s2[1] + s2[2] + s2[3] +
325  s3[0] + s3[1] + s3[2] + s3[3] +
326  s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
327  s1 += 4;
328  s2 += 4;
329  s3 += 4;
330  s4 += 4;
331  d++;
332  }
333  src += 4 * src_wrap;
334  dst += dst_wrap;
335  }
336 }
337 
338 /* 8x8 -> 1x1 */
339 void ff_shrink88(uint8_t *dst, int dst_wrap,
340  const uint8_t *src, int src_wrap,
341  int width, int height)
342 {
343  int w, i;
344 
345  for(;height > 0; height--) {
346  for(w = width;w > 0; w--) {
347  int tmp=0;
348  for(i=0; i<8; i++){
349  tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
350  src += src_wrap;
351  }
352  *(dst++) = (tmp + 32)>>6;
353  src += 8 - 8*src_wrap;
354  }
355  src += 8*src_wrap - 8*width;
356  dst += dst_wrap - width;
357  }
358 }
359 
360 /* return true if yuv planar */
361 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
362 {
363  int i;
364  int planes[4] = { 0 };
365 
366  if ( desc->flags & PIX_FMT_RGB
367  || !(desc->flags & PIX_FMT_PLANAR))
368  return 0;
369 
370  /* set the used planes */
371  for (i = 0; i < desc->nb_components; i++)
372  planes[desc->comp[i].plane] = 1;
373 
374  /* if there is an unused plane, the format is not planar */
375  for (i = 0; i < desc->nb_components; i++)
376  if (!planes[i])
377  return 0;
378  return 1;
379 }
380 
381 int av_picture_crop(AVPicture *dst, const AVPicture *src,
382  enum AVPixelFormat pix_fmt, int top_band, int left_band)
383 {
384  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
385  int y_shift;
386  int x_shift;
387 
388  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
389  return -1;
390 
391  y_shift = desc->log2_chroma_h;
392  x_shift = desc->log2_chroma_w;
393 
394  if (is_yuv_planar(desc)) {
395  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
396  dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
397  dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
398  } else{
399  if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
400  return -1;
401  if(left_band) //FIXME add support for this too
402  return -1;
403  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
404  }
405 
406  dst->linesize[0] = src->linesize[0];
407  dst->linesize[1] = src->linesize[1];
408  dst->linesize[2] = src->linesize[2];
409  return 0;
410 }
411 
412 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
413  enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
414  int *color)
415 {
416  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
417  uint8_t *optr;
418  int y_shift;
419  int x_shift;
420  int yheight;
421  int i, y;
422 
423  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
424  !is_yuv_planar(desc)) return -1;
425 
426  for (i = 0; i < 3; i++) {
427  x_shift = i ? desc->log2_chroma_w : 0;
428  y_shift = i ? desc->log2_chroma_h : 0;
429 
430  if (padtop || padleft) {
431  memset(dst->data[i], color[i],
432  dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
433  }
434 
435  if (padleft || padright) {
436  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
437  (dst->linesize[i] - (padright >> x_shift));
438  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
439  for (y = 0; y < yheight; y++) {
440  memset(optr, color[i], (padleft + padright) >> x_shift);
441  optr += dst->linesize[i];
442  }
443  }
444 
445  if (src) { /* first line */
446  uint8_t *iptr = src->data[i];
447  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
448  (padleft >> x_shift);
449  memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
450  iptr += src->linesize[i];
451  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
452  (dst->linesize[i] - (padright >> x_shift));
453  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
454  for (y = 0; y < yheight; y++) {
455  memset(optr, color[i], (padleft + padright) >> x_shift);
456  memcpy(optr + ((padleft + padright) >> x_shift), iptr,
457  (width - padleft - padright) >> x_shift);
458  iptr += src->linesize[i];
459  optr += dst->linesize[i];
460  }
461  }
462 
463  if (padbottom || padright) {
464  optr = dst->data[i] + dst->linesize[i] *
465  ((height - padbottom) >> y_shift) - (padright >> x_shift);
466  memset(optr, color[i],dst->linesize[i] *
467  (padbottom >> y_shift) + (padright >> x_shift));
468  }
469  }
470  return 0;
471 }
472 
473 #if !HAVE_MMX_EXTERNAL
474 /* filter parameters: [-1 4 2 4 -1] // 8 */
475 static void deinterlace_line_c(uint8_t *dst,
476  const uint8_t *lum_m4, const uint8_t *lum_m3,
477  const uint8_t *lum_m2, const uint8_t *lum_m1,
478  const uint8_t *lum,
479  int size)
480 {
481  uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
482  int sum;
483 
484  for(;size > 0;size--) {
485  sum = -lum_m4[0];
486  sum += lum_m3[0] << 2;
487  sum += lum_m2[0] << 1;
488  sum += lum_m1[0] << 2;
489  sum += -lum[0];
490  dst[0] = cm[(sum + 4) >> 3];
491  lum_m4++;
492  lum_m3++;
493  lum_m2++;
494  lum_m1++;
495  lum++;
496  dst++;
497  }
498 }
499 
500 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
501  uint8_t *lum_m2, uint8_t *lum_m1,
502  uint8_t *lum, int size)
503 {
504  uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
505  int sum;
506 
507  for(;size > 0;size--) {
508  sum = -lum_m4[0];
509  sum += lum_m3[0] << 2;
510  sum += lum_m2[0] << 1;
511  lum_m4[0]=lum_m2[0];
512  sum += lum_m1[0] << 2;
513  sum += -lum[0];
514  lum_m2[0] = cm[(sum + 4) >> 3];
515  lum_m4++;
516  lum_m3++;
517  lum_m2++;
518  lum_m1++;
519  lum++;
520  }
521 }
522 #endif /* !HAVE_MMX_EXTERNAL */
523 
524 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
525  top field is copied as is, but the bottom field is deinterlaced
526  against the top field. */
527 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
528  const uint8_t *src1, int src_wrap,
529  int width, int height)
530 {
531  const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
532  int y;
533 
534  src_m2 = src1;
535  src_m1 = src1;
536  src_0=&src_m1[src_wrap];
537  src_p1=&src_0[src_wrap];
538  src_p2=&src_p1[src_wrap];
539  for(y=0;y<(height-2);y+=2) {
540  memcpy(dst,src_m1,width);
541  dst += dst_wrap;
542  deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
543  src_m2 = src_0;
544  src_m1 = src_p1;
545  src_0 = src_p2;
546  src_p1 += 2*src_wrap;
547  src_p2 += 2*src_wrap;
548  dst += dst_wrap;
549  }
550  memcpy(dst,src_m1,width);
551  dst += dst_wrap;
552  /* do last line */
553  deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
554 }
555 
556 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
557  int width, int height)
558 {
559  uint8_t *src_m1, *src_0, *src_p1, *src_p2;
560  int y;
561  uint8_t *buf;
562  buf = av_malloc(width);
563 
564  src_m1 = src1;
565  memcpy(buf,src_m1,width);
566  src_0=&src_m1[src_wrap];
567  src_p1=&src_0[src_wrap];
568  src_p2=&src_p1[src_wrap];
569  for(y=0;y<(height-2);y+=2) {
570  deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
571  src_m1 = src_p1;
572  src_0 = src_p2;
573  src_p1 += 2*src_wrap;
574  src_p2 += 2*src_wrap;
575  }
576  /* do last line */
577  deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
578  av_free(buf);
579 }
580 
581 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
582  enum AVPixelFormat pix_fmt, int width, int height)
583 {
584  int i;
585 
586  if (pix_fmt != AV_PIX_FMT_YUV420P &&
587  pix_fmt != AV_PIX_FMT_YUVJ420P &&
588  pix_fmt != AV_PIX_FMT_YUV422P &&
589  pix_fmt != AV_PIX_FMT_YUVJ422P &&
590  pix_fmt != AV_PIX_FMT_YUV444P &&
591  pix_fmt != AV_PIX_FMT_YUV411P &&
592  pix_fmt != AV_PIX_FMT_GRAY8)
593  return -1;
594  if ((width & 3) != 0 || (height & 3) != 0)
595  return -1;
596 
597  for(i=0;i<3;i++) {
598  if (i == 1) {
599  switch(pix_fmt) {
600  case AV_PIX_FMT_YUVJ420P:
601  case AV_PIX_FMT_YUV420P:
602  width >>= 1;
603  height >>= 1;
604  break;
605  case AV_PIX_FMT_YUV422P:
606  case AV_PIX_FMT_YUVJ422P:
607  width >>= 1;
608  break;
609  case AV_PIX_FMT_YUV411P:
610  width >>= 2;
611  break;
612  default:
613  break;
614  }
615  if (pix_fmt == AV_PIX_FMT_GRAY8) {
616  break;
617  }
618  }
619  if (src == dst) {
620  deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
621  width, height);
622  } else {
623  deinterlace_bottom_field(dst->data[i],dst->linesize[i],
624  src->data[i], src->linesize[i],
625  width, height);
626  }
627  }
628  emms_c();
629  return 0;
630 }
631 
632 #ifdef TEST
633 
634 int main(void){
635  int i;
636  int err=0;
637  int skip = 0;
638 
639  for (i=0; i<AV_PIX_FMT_NB*2; i++) {
640  AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
641  if(!desc || !desc->name) {
642  skip ++;
643  continue;
644  }
645  if (skip) {
646  av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
647  skip = 0;
648  }
649  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));
650  if ((!(desc->flags & PIX_FMT_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
651  av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
652  err = 1;
653  }
654  }
655  return err;
656 }
657 
658 #endif
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