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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 "imgconvert.h"
35 #include "internal.h"
36 #include "mathops.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 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
45 #define deinterlace_line ff_deinterlace_line_mmx
46 #else
47 #define deinterlace_line_inplace deinterlace_line_inplace_c
48 #define deinterlace_line deinterlace_line_c
49 #endif
50 
51 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
52 {
53  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
54  av_assert0(desc);
55  *h_shift = desc->log2_chroma_w;
56  *v_shift = desc->log2_chroma_h;
57 }
58 
59 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
60  enum AVPixelFormat src_pix_fmt,
61  int has_alpha)
62 {
63  return av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
64 }
65 
66 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
67  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
68 {
69  return av_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
70 }
71 
72 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
73 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
74  enum AVPixelFormat src_pix_fmt,
75  int has_alpha, int *loss_ptr){
76  return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
77 }
78 #else
79 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
80  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
81 {
82  return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
83 }
84 #endif
85 
86 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
87  enum AVPixelFormat src_pix_fmt,
88  int has_alpha, int *loss_ptr){
89  int i;
90 
91  enum AVPixelFormat best = AV_PIX_FMT_NONE;
92 
93  for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
94  best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
95 
96  return best;
97 }
98 
99 /* 2x2 -> 1x1 */
100 void ff_shrink22(uint8_t *dst, int dst_wrap,
101  const uint8_t *src, int src_wrap,
102  int width, int height)
103 {
104  int w;
105  const uint8_t *s1, *s2;
106  uint8_t *d;
107 
108  for(;height > 0; height--) {
109  s1 = src;
110  s2 = s1 + src_wrap;
111  d = dst;
112  for(w = width;w >= 4; w-=4) {
113  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
114  d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
115  d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
116  d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
117  s1 += 8;
118  s2 += 8;
119  d += 4;
120  }
121  for(;w > 0; w--) {
122  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
123  s1 += 2;
124  s2 += 2;
125  d++;
126  }
127  src += 2 * src_wrap;
128  dst += dst_wrap;
129  }
130 }
131 
132 /* 4x4 -> 1x1 */
133 void ff_shrink44(uint8_t *dst, int dst_wrap,
134  const uint8_t *src, int src_wrap,
135  int width, int height)
136 {
137  int w;
138  const uint8_t *s1, *s2, *s3, *s4;
139  uint8_t *d;
140 
141  for(;height > 0; height--) {
142  s1 = src;
143  s2 = s1 + src_wrap;
144  s3 = s2 + src_wrap;
145  s4 = s3 + src_wrap;
146  d = dst;
147  for(w = width;w > 0; w--) {
148  d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
149  s2[0] + s2[1] + s2[2] + s2[3] +
150  s3[0] + s3[1] + s3[2] + s3[3] +
151  s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
152  s1 += 4;
153  s2 += 4;
154  s3 += 4;
155  s4 += 4;
156  d++;
157  }
158  src += 4 * src_wrap;
159  dst += dst_wrap;
160  }
161 }
162 
163 /* 8x8 -> 1x1 */
164 void ff_shrink88(uint8_t *dst, int dst_wrap,
165  const uint8_t *src, int src_wrap,
166  int width, int height)
167 {
168  int w, i;
169 
170  for(;height > 0; height--) {
171  for(w = width;w > 0; w--) {
172  int tmp=0;
173  for(i=0; i<8; i++){
174  tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
175  src += src_wrap;
176  }
177  *(dst++) = (tmp + 32)>>6;
178  src += 8 - 8*src_wrap;
179  }
180  src += 8*src_wrap - 8*width;
181  dst += dst_wrap - width;
182  }
183 }
184 
185 /* return true if yuv planar */
186 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
187 {
188  int i;
189  int planes[4] = { 0 };
190 
191  if ( desc->flags & AV_PIX_FMT_FLAG_RGB
192  || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
193  return 0;
194 
195  /* set the used planes */
196  for (i = 0; i < desc->nb_components; i++)
197  planes[desc->comp[i].plane] = 1;
198 
199  /* if there is an unused plane, the format is not planar */
200  for (i = 0; i < desc->nb_components; i++)
201  if (!planes[i])
202  return 0;
203  return 1;
204 }
205 
206 int av_picture_crop(AVPicture *dst, const AVPicture *src,
207  enum AVPixelFormat pix_fmt, int top_band, int left_band)
208 {
209  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
210  int y_shift;
211  int x_shift;
212 
213  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
214  return -1;
215 
216  y_shift = desc->log2_chroma_h;
217  x_shift = desc->log2_chroma_w;
218 
219  if (is_yuv_planar(desc)) {
220  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
221  dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
222  dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
223  } else{
224  if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
225  return -1;
226  if(left_band) //FIXME add support for this too
227  return -1;
228  dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
229  }
230 
231  dst->linesize[0] = src->linesize[0];
232  dst->linesize[1] = src->linesize[1];
233  dst->linesize[2] = src->linesize[2];
234  return 0;
235 }
236 
237 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
238  enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
239  int *color)
240 {
241  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
242  uint8_t *optr;
243  int y_shift;
244  int x_shift;
245  int yheight;
246  int i, y;
247 
248  if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
249  !is_yuv_planar(desc)) return -1;
250 
251  for (i = 0; i < 3; i++) {
252  x_shift = i ? desc->log2_chroma_w : 0;
253  y_shift = i ? desc->log2_chroma_h : 0;
254 
255  if (padtop || padleft) {
256  memset(dst->data[i], color[i],
257  dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
258  }
259 
260  if (padleft || padright) {
261  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
262  (dst->linesize[i] - (padright >> x_shift));
263  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
264  for (y = 0; y < yheight; y++) {
265  memset(optr, color[i], (padleft + padright) >> x_shift);
266  optr += dst->linesize[i];
267  }
268  }
269 
270  if (src) { /* first line */
271  uint8_t *iptr = src->data[i];
272  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
273  (padleft >> x_shift);
274  memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
275  iptr += src->linesize[i];
276  optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
277  (dst->linesize[i] - (padright >> x_shift));
278  yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
279  for (y = 0; y < yheight; y++) {
280  memset(optr, color[i], (padleft + padright) >> x_shift);
281  memcpy(optr + ((padleft + padright) >> x_shift), iptr,
282  (width - padleft - padright) >> x_shift);
283  iptr += src->linesize[i];
284  optr += dst->linesize[i];
285  }
286  }
287 
288  if (padbottom || padright) {
289  optr = dst->data[i] + dst->linesize[i] *
290  ((height - padbottom) >> y_shift) - (padright >> x_shift);
291  memset(optr, color[i],dst->linesize[i] *
292  (padbottom >> y_shift) + (padright >> x_shift));
293  }
294  }
295  return 0;
296 }
297 
298 #if FF_API_DEINTERLACE
299 
300 #if !HAVE_MMX_EXTERNAL
301 /* filter parameters: [-1 4 2 4 -1] // 8 */
302 static void deinterlace_line_c(uint8_t *dst,
303  const uint8_t *lum_m4, const uint8_t *lum_m3,
304  const uint8_t *lum_m2, const uint8_t *lum_m1,
305  const uint8_t *lum,
306  int size)
307 {
308  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
309  int sum;
310 
311  for(;size > 0;size--) {
312  sum = -lum_m4[0];
313  sum += lum_m3[0] << 2;
314  sum += lum_m2[0] << 1;
315  sum += lum_m1[0] << 2;
316  sum += -lum[0];
317  dst[0] = cm[(sum + 4) >> 3];
318  lum_m4++;
319  lum_m3++;
320  lum_m2++;
321  lum_m1++;
322  lum++;
323  dst++;
324  }
325 }
326 
327 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
328  uint8_t *lum_m2, uint8_t *lum_m1,
329  uint8_t *lum, int size)
330 {
331  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
332  int sum;
333 
334  for(;size > 0;size--) {
335  sum = -lum_m4[0];
336  sum += lum_m3[0] << 2;
337  sum += lum_m2[0] << 1;
338  lum_m4[0]=lum_m2[0];
339  sum += lum_m1[0] << 2;
340  sum += -lum[0];
341  lum_m2[0] = cm[(sum + 4) >> 3];
342  lum_m4++;
343  lum_m3++;
344  lum_m2++;
345  lum_m1++;
346  lum++;
347  }
348 }
349 #endif /* !HAVE_MMX_EXTERNAL */
350 
351 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
352  top field is copied as is, but the bottom field is deinterlaced
353  against the top field. */
354 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
355  const uint8_t *src1, int src_wrap,
356  int width, int height)
357 {
358  const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
359  int y;
360 
361  src_m2 = src1;
362  src_m1 = src1;
363  src_0=&src_m1[src_wrap];
364  src_p1=&src_0[src_wrap];
365  src_p2=&src_p1[src_wrap];
366  for(y=0;y<(height-2);y+=2) {
367  memcpy(dst,src_m1,width);
368  dst += dst_wrap;
369  deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
370  src_m2 = src_0;
371  src_m1 = src_p1;
372  src_0 = src_p2;
373  src_p1 += 2*src_wrap;
374  src_p2 += 2*src_wrap;
375  dst += dst_wrap;
376  }
377  memcpy(dst,src_m1,width);
378  dst += dst_wrap;
379  /* do last line */
380  deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
381 }
382 
383 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
384  int width, int height)
385 {
386  uint8_t *src_m1, *src_0, *src_p1, *src_p2;
387  int y;
388  uint8_t *buf;
389  buf = av_malloc(width);
390 
391  src_m1 = src1;
392  memcpy(buf,src_m1,width);
393  src_0=&src_m1[src_wrap];
394  src_p1=&src_0[src_wrap];
395  src_p2=&src_p1[src_wrap];
396  for(y=0;y<(height-2);y+=2) {
397  deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
398  src_m1 = src_p1;
399  src_0 = src_p2;
400  src_p1 += 2*src_wrap;
401  src_p2 += 2*src_wrap;
402  }
403  /* do last line */
404  deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
405  av_free(buf);
406 }
407 
408 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
409  enum AVPixelFormat pix_fmt, int width, int height)
410 {
411  int i;
412 
413  if (pix_fmt != AV_PIX_FMT_YUV420P &&
414  pix_fmt != AV_PIX_FMT_YUVJ420P &&
415  pix_fmt != AV_PIX_FMT_YUV422P &&
416  pix_fmt != AV_PIX_FMT_YUVJ422P &&
417  pix_fmt != AV_PIX_FMT_YUV444P &&
418  pix_fmt != AV_PIX_FMT_YUV411P &&
419  pix_fmt != AV_PIX_FMT_GRAY8)
420  return -1;
421  if ((width & 3) != 0 || (height & 3) != 0)
422  return -1;
423 
424  for(i=0;i<3;i++) {
425  if (i == 1) {
426  switch(pix_fmt) {
427  case AV_PIX_FMT_YUVJ420P:
428  case AV_PIX_FMT_YUV420P:
429  width >>= 1;
430  height >>= 1;
431  break;
432  case AV_PIX_FMT_YUV422P:
433  case AV_PIX_FMT_YUVJ422P:
434  width >>= 1;
435  break;
436  case AV_PIX_FMT_YUV411P:
437  width >>= 2;
438  break;
439  default:
440  break;
441  }
442  if (pix_fmt == AV_PIX_FMT_GRAY8) {
443  break;
444  }
445  }
446  if (src == dst) {
447  deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
448  width, height);
449  } else {
450  deinterlace_bottom_field(dst->data[i],dst->linesize[i],
451  src->data[i], src->linesize[i],
452  width, height);
453  }
454  }
455  emms_c();
456  return 0;
457 }
458 
459 #endif /* FF_API_DEINTERLACE */
460 
461 #ifdef TEST
462 
463 int main(void){
464  int i;
465  int err=0;
466  int skip = 0;
467 
468  for (i=0; i<AV_PIX_FMT_NB*2; i++) {
469  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
470  if(!desc || !desc->name) {
471  skip ++;
472  continue;
473  }
474  if (skip) {
475  av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
476  skip = 0;
477  }
478  av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc));
479  if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
480  av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
481  err = 1;
482  }
483  }
484  return err;
485 }
486 
487 #endif
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