Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
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/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_x86.h"
44 #endif
45 
46 #if HAVE_MMX_EXTERNAL
47 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
48 #define deinterlace_line ff_deinterlace_line_mmx
49 #else
50 #define deinterlace_line_inplace deinterlace_line_inplace_c
51 #define deinterlace_line deinterlace_line_c
52 #endif
53 
54 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
55 {
56  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
57  *h_shift = desc->log2_chroma_w;
58  *v_shift = desc->log2_chroma_h;
59 }
60 
61 static int is_gray(const AVPixFmtDescriptor *desc)
62 {
63  return desc->nb_components - (desc->flags & AV_PIX_FMT_FLAG_ALPHA) == 1;
64 }
65 
67  enum AVPixelFormat src_pix_fmt,
68  int has_alpha)
69 {
70  const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
71  const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
72  int loss, i, nb_components = FFMIN(src_desc->nb_components,
73  dst_desc->nb_components);
74 
75  /* compute loss */
76  loss = 0;
77 
78  if (dst_pix_fmt == src_pix_fmt)
79  return 0;
80 
81  for (i = 0; i < nb_components; i++)
82  if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1)
83  loss |= FF_LOSS_DEPTH;
84 
85  if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
86  dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
87  loss |= FF_LOSS_RESOLUTION;
88 
89  if ((src_desc->flags & AV_PIX_FMT_FLAG_RGB) != (dst_desc->flags & AV_PIX_FMT_FLAG_RGB))
90  loss |= FF_LOSS_COLORSPACE;
91 
92  if (has_alpha && !(dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA) &&
93  (dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA))
94  loss |= FF_LOSS_ALPHA;
95 
96  if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
97  return loss | FF_LOSS_COLORQUANT;
98 
99  if (src_desc->nb_components > dst_desc->nb_components)
100  if (is_gray(dst_desc))
101  loss |= FF_LOSS_CHROMA;
102 
103  return loss;
104 }
105 
107  enum AVPixelFormat src_pix_fmt,
108  int has_alpha,
109  int loss_mask)
110 {
111  int dist, i, loss, min_dist;
112  enum AVPixelFormat dst_pix_fmt;
113 
114  /* find exact color match with smallest size */
115  dst_pix_fmt = AV_PIX_FMT_NONE;
116  min_dist = 0x7fffffff;
117  i = 0;
118  while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
119  enum AVPixelFormat pix_fmt = pix_fmt_list[i];
120 
121  if (i > AV_PIX_FMT_NB) {
122  av_log(NULL, AV_LOG_ERROR, "Pixel format list longer than expected, "
123  "it is either not properly terminated or contains duplicates\n");
124  return AV_PIX_FMT_NONE;
125  }
126 
127  loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
128  if (loss == 0) {
130  if (dist < min_dist) {
131  min_dist = dist;
132  dst_pix_fmt = pix_fmt;
133  }
134  }
135  i++;
136  }
137  return dst_pix_fmt;
138 }
139 
141  enum AVPixelFormat src_pix_fmt,
142  int has_alpha, int *loss_ptr)
143 {
144  enum AVPixelFormat dst_pix_fmt;
145  int loss_mask, i;
146  static const int loss_mask_order[] = {
147  ~0, /* no loss first */
148  ~FF_LOSS_ALPHA,
152  ~FF_LOSS_DEPTH,
153  0,
154  };
155 
156  /* try with successive loss */
157  i = 0;
158  for(;;) {
159  loss_mask = loss_mask_order[i++];
160  dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_list, src_pix_fmt,
161  has_alpha, loss_mask);
162  if (dst_pix_fmt >= 0)
163  goto found;
164  if (loss_mask == 0)
165  break;
166  }
167  return AV_PIX_FMT_NONE;
168  found:
169  if (loss_ptr)
170  *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
171  return dst_pix_fmt;
172 }
173 
174 /* 2x2 -> 1x1 */
175 void ff_shrink22(uint8_t *dst, int dst_wrap,
176  const uint8_t *src, int src_wrap,
177  int width, int height)
178 {
179  int w;
180  const uint8_t *s1, *s2;
181  uint8_t *d;
182 
183  for(;height > 0; height--) {
184  s1 = src;
185  s2 = s1 + src_wrap;
186  d = dst;
187  for(w = width;w >= 4; w-=4) {
188  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
189  d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
190  d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
191  d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
192  s1 += 8;
193  s2 += 8;
194  d += 4;
195  }
196  for(;w > 0; w--) {
197  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
198  s1 += 2;
199  s2 += 2;
200  d++;
201  }
202  src += 2 * src_wrap;
203  dst += dst_wrap;
204  }
205 }
206 
207 /* 4x4 -> 1x1 */
208 void ff_shrink44(uint8_t *dst, int dst_wrap,
209  const uint8_t *src, int src_wrap,
210  int width, int height)
211 {
212  int w;
213  const uint8_t *s1, *s2, *s3, *s4;
214  uint8_t *d;
215 
216  for(;height > 0; height--) {
217  s1 = src;
218  s2 = s1 + src_wrap;
219  s3 = s2 + src_wrap;
220  s4 = s3 + src_wrap;
221  d = dst;
222  for(w = width;w > 0; w--) {
223  d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
224  s2[0] + s2[1] + s2[2] + s2[3] +
225  s3[0] + s3[1] + s3[2] + s3[3] +
226  s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
227  s1 += 4;
228  s2 += 4;
229  s3 += 4;
230  s4 += 4;
231  d++;
232  }
233  src += 4 * src_wrap;
234  dst += dst_wrap;
235  }
236 }
237 
238 /* 8x8 -> 1x1 */
239 void ff_shrink88(uint8_t *dst, int dst_wrap,
240  const uint8_t *src, int src_wrap,
241  int width, int height)
242 {
243  int w, i;
244 
245  for(;height > 0; height--) {
246  for(w = width;w > 0; w--) {
247  int tmp=0;
248  for(i=0; i<8; i++){
249  tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
250  src += src_wrap;
251  }
252  *(dst++) = (tmp + 32)>>6;
253  src += 8 - 8*src_wrap;
254  }
255  src += 8*src_wrap - 8*width;
256  dst += dst_wrap - width;
257  }
258 }
259 
260 /* return true if yuv planar */
261 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
262 {
263  return (!(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
264  (desc->flags & AV_PIX_FMT_FLAG_PLANAR));
265 }
266 
267 int av_picture_crop(AVPicture *dst, const AVPicture *src,
268  enum AVPixelFormat pix_fmt, int top_band, int left_band)
269 {
270  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
271  int y_shift;
272  int x_shift;
273 
274  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
275  return -1;
276 
277  y_shift = desc->log2_chroma_h;
278  x_shift = desc->log2_chroma_w;
279 
280  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
281  dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
282  dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
283 
284  dst->linesize[0] = src->linesize[0];
285  dst->linesize[1] = src->linesize[1];
286  dst->linesize[2] = src->linesize[2];
287  return 0;
288 }
289 
290 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
291  enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
292  int *color)
293 {
294  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
295  uint8_t *optr;
296  int y_shift;
297  int x_shift;
298  int yheight;
299  int i, y;
300 
301  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
302  !is_yuv_planar(desc)) return -1;
303 
304  for (i = 0; i < 3; i++) {
305  x_shift = i ? desc->log2_chroma_w : 0;
306  y_shift = i ? desc->log2_chroma_h : 0;
307 
308  if (padtop || padleft) {
309  memset(dst->data[i], color[i],
310  dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
311  }
312 
313  if (padleft || padright) {
314  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
315  (dst->linesize[i] - (padright >> x_shift));
316  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
317  for (y = 0; y < yheight; y++) {
318  memset(optr, color[i], (padleft + padright) >> x_shift);
319  optr += dst->linesize[i];
320  }
321  }
322 
323  if (src) { /* first line */
324  uint8_t *iptr = src->data[i];
325  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
326  (padleft >> x_shift);
327  memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
328  iptr += src->linesize[i];
329  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
330  (dst->linesize[i] - (padright >> x_shift));
331  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
332  for (y = 0; y < yheight; y++) {
333  memset(optr, color[i], (padleft + padright) >> x_shift);
334  memcpy(optr + ((padleft + padright) >> x_shift), iptr,
335  (width - padleft - padright) >> x_shift);
336  iptr += src->linesize[i];
337  optr += dst->linesize[i];
338  }
339  }
340 
341  if (padbottom || padright) {
342  optr = dst->data[i] + dst->linesize[i] *
343  ((height - padbottom) >> y_shift) - (padright >> x_shift);
344  memset(optr, color[i],dst->linesize[i] *
345  (padbottom >> y_shift) + (padright >> x_shift));
346  }
347  }
348  return 0;
349 }
350 
351 #if FF_API_DEINTERLACE
352 
353 #if !HAVE_MMX_EXTERNAL
354 /* filter parameters: [-1 4 2 4 -1] // 8 */
355 static void deinterlace_line_c(uint8_t *dst,
356  const uint8_t *lum_m4, const uint8_t *lum_m3,
357  const uint8_t *lum_m2, const uint8_t *lum_m1,
358  const uint8_t *lum,
359  int size)
360 {
361  const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
362  int sum;
363 
364  for(;size > 0;size--) {
365  sum = -lum_m4[0];
366  sum += lum_m3[0] << 2;
367  sum += lum_m2[0] << 1;
368  sum += lum_m1[0] << 2;
369  sum += -lum[0];
370  dst[0] = cm[(sum + 4) >> 3];
371  lum_m4++;
372  lum_m3++;
373  lum_m2++;
374  lum_m1++;
375  lum++;
376  dst++;
377  }
378 }
379 
380 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
381  uint8_t *lum_m2, uint8_t *lum_m1,
382  uint8_t *lum, int size)
383 {
384  const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
385  int sum;
386 
387  for(;size > 0;size--) {
388  sum = -lum_m4[0];
389  sum += lum_m3[0] << 2;
390  sum += lum_m2[0] << 1;
391  lum_m4[0]=lum_m2[0];
392  sum += lum_m1[0] << 2;
393  sum += -lum[0];
394  lum_m2[0] = cm[(sum + 4) >> 3];
395  lum_m4++;
396  lum_m3++;
397  lum_m2++;
398  lum_m1++;
399  lum++;
400  }
401 }
402 #endif /* !HAVE_MMX_EXTERNAL */
403 
404 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
405  top field is copied as is, but the bottom field is deinterlaced
406  against the top field. */
407 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
408  const uint8_t *src1, int src_wrap,
409  int width, int height)
410 {
411  const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
412  int y;
413 
414  src_m2 = src1;
415  src_m1 = src1;
416  src_0=&src_m1[src_wrap];
417  src_p1=&src_0[src_wrap];
418  src_p2=&src_p1[src_wrap];
419  for(y=0;y<(height-2);y+=2) {
420  memcpy(dst,src_m1,width);
421  dst += dst_wrap;
422  deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
423  src_m2 = src_0;
424  src_m1 = src_p1;
425  src_0 = src_p2;
426  src_p1 += 2*src_wrap;
427  src_p2 += 2*src_wrap;
428  dst += dst_wrap;
429  }
430  memcpy(dst,src_m1,width);
431  dst += dst_wrap;
432  /* do last line */
433  deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
434 }
435 
436 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
437  int width, int height)
438 {
439  uint8_t *src_m1, *src_0, *src_p1, *src_p2;
440  int y;
441  uint8_t *buf;
442  buf = av_malloc(width);
443 
444  src_m1 = src1;
445  memcpy(buf,src_m1,width);
446  src_0=&src_m1[src_wrap];
447  src_p1=&src_0[src_wrap];
448  src_p2=&src_p1[src_wrap];
449  for(y=0;y<(height-2);y+=2) {
450  deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
451  src_m1 = src_p1;
452  src_0 = src_p2;
453  src_p1 += 2*src_wrap;
454  src_p2 += 2*src_wrap;
455  }
456  /* do last line */
457  deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
458  av_free(buf);
459 }
460 
462  enum AVPixelFormat pix_fmt, int width, int height)
463 {
464  int i;
465 
466  if (pix_fmt != AV_PIX_FMT_YUV420P &&
467  pix_fmt != AV_PIX_FMT_YUVJ420P &&
468  pix_fmt != AV_PIX_FMT_YUV422P &&
469  pix_fmt != AV_PIX_FMT_YUVJ422P &&
470  pix_fmt != AV_PIX_FMT_YUV444P &&
471  pix_fmt != AV_PIX_FMT_YUV411P &&
472  pix_fmt != AV_PIX_FMT_GRAY8)
473  return -1;
474  if ((width & 3) != 0 || (height & 3) != 0)
475  return -1;
476 
477  for(i=0;i<3;i++) {
478  if (i == 1) {
479  switch(pix_fmt) {
480  case AV_PIX_FMT_YUVJ420P:
481  case AV_PIX_FMT_YUV420P:
482  width >>= 1;
483  height >>= 1;
484  break;
485  case AV_PIX_FMT_YUV422P:
486  case AV_PIX_FMT_YUVJ422P:
487  width >>= 1;
488  break;
489  case AV_PIX_FMT_YUV411P:
490  width >>= 2;
491  break;
492  default:
493  break;
494  }
495  if (pix_fmt == AV_PIX_FMT_GRAY8) {
496  break;
497  }
498  }
499  if (src == dst) {
501  width, height);
502  } else {
503  deinterlace_bottom_field(dst->data[i],dst->linesize[i],
504  src->data[i], src->linesize[i],
505  width, height);
506  }
507  }
508  emms_c();
509  return 0;
510 }
511 
512 #endif /* FF_API_DEINTERLACE */
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
#define ff_cropTbl
int size
int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:2952
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:1507
#define deinterlace_line_inplace
Definition: imgconvert.c:50
#define FF_LOSS_COLORQUANT
loss due to color quantization
Definition: avcodec.h:4050
int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
deinterlace - if not supported return -1
Definition: imgconvert.c:461
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
misc image utilities
static int is_yuv_planar(const AVPixFmtDescriptor *desc)
Definition: imgconvert.c:261
int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel used by the pixel format described by pixdesc.
Definition: pixdesc.c:1480
static int is_gray(const AVPixFmtDescriptor *desc)
Definition: imgconvert.c:61
#define MAX_NEG_CROP
Definition: dsputil.h:44
Various defines for YUV<->RGB conversion.
int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
Crop image top and left side.
Definition: imgconvert.c:267
void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Definition: imgconvert.c:54
four components are given, that's all.
Definition: avcodec.h:2950
static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap, const uint8_t *src1, int src_wrap, int width, int height)
Definition: imgconvert.c:407
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:68
static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap, int width, int height)
Definition: imgconvert.c:436
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
Compute what kind of losses will occur when converting from one specific pixel format to another...
Definition: imgconvert.c:66
static void deinterlace_line_c(uint8_t *dst, const uint8_t *lum_m4, const uint8_t *lum_m3, const uint8_t *lum_m2, const uint8_t *lum_m1, const uint8_t *lum, int size)
Definition: imgconvert.c:355
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:85
uint8_t
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:121
8 bit with PIX_FMT_RGB32 palette
Definition: pixfmt.h:76
uint8_t * data[AV_NUM_DATA_POINTERS]
Definition: avcodec.h:2951
#define emms_c()
Definition: internal.h:46
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV422P and setting color_...
Definition: pixfmt.h:78
void ff_shrink44(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height)
Definition: imgconvert.c:208
#define cm
Definition: dvbsubdec.c:34
uint16_t depth_minus1
number of bits in the component minus 1
Definition: pixdesc.h:45
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:77
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:111
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:69
#define FF_LOSS_ALPHA
loss of alpha bits
Definition: avcodec.h:4049
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:59
void ff_shrink88(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height)
Definition: imgconvert.c:239
void ff_shrink22(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height)
Definition: imgconvert.c:175
#define FFMIN(a, b)
Definition: common.h:57
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
Definition: pixfmt.h:77
#define deinterlace_line
Definition: imgconvert.c:51
enum AVPixelFormat pix_fmt
Definition: movenc.c:821
static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int loss_mask)
Definition: imgconvert.c:106
NULL
Definition: eval.c:55
static int width
Definition: utils.c:156
Libavcodec external API header.
uint8_t flags
Definition: pixdesc.h:78
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:57
#define FF_LOSS_CHROMA
loss of chroma (e.g.
Definition: avcodec.h:4051
#define FF_LOSS_DEPTH
loss due to color depth change
Definition: avcodec.h:4047
#define FF_LOSS_COLORSPACE
loss due to color space conversion
Definition: avcodec.h:4048
int height
Definition: gxfenc.c:72
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
Y , 8bpp.
Definition: pixfmt.h:73
common internal api header.
common internal and external API header
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:72
static const uint8_t color[]
Definition: log.c:54
DSP utils.
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
Pad image.
Definition: imgconvert.c:290
#define FF_LOSS_RESOLUTION
loss due to resolution change
Definition: avcodec.h:4046
enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
Definition: imgconvert.c:140
number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of...
Definition: pixfmt.h:193
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:107
static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3, uint8_t *lum_m2, uint8_t *lum_m1, uint8_t *lum, int size)
Definition: imgconvert.c:380