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