2 * Misc image conversion routines
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
24 * misc image conversion routines
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
35 #include "imgconvert.h"
37 #include "libavutil/colorspace.h"
38 #include "libavutil/common.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavutil/imgutils.h"
43 #include "x86/dsputil_mmx.h"
47 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
48 #define deinterlace_line ff_deinterlace_line_mmx
50 #define deinterlace_line_inplace deinterlace_line_inplace_c
51 #define deinterlace_line deinterlace_line_c
54 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
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;
61 static int is_gray(const AVPixFmtDescriptor *desc)
63 return desc->nb_components - (desc->flags & PIX_FMT_ALPHA) == 1;
66 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
67 enum AVPixelFormat src_pix_fmt,
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);
78 if (dst_pix_fmt == src_pix_fmt)
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;
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;
89 if ((src_desc->flags & PIX_FMT_RGB) != (dst_desc->flags & PIX_FMT_RGB))
90 loss |= FF_LOSS_COLORSPACE;
92 if (has_alpha && !(dst_desc->flags & PIX_FMT_ALPHA) &&
93 (dst_desc->flags & PIX_FMT_ALPHA))
94 loss |= FF_LOSS_ALPHA;
96 if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
97 return loss | FF_LOSS_COLORQUANT;
99 if (src_desc->nb_components > dst_desc->nb_components)
100 if (is_gray(dst_desc))
101 loss |= FF_LOSS_CHROMA;
106 static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list,
107 enum AVPixelFormat src_pix_fmt,
111 int dist, i, loss, min_dist;
112 enum AVPixelFormat dst_pix_fmt;
114 /* find exact color match with smallest size */
115 dst_pix_fmt = AV_PIX_FMT_NONE;
116 min_dist = 0x7fffffff;
118 while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
119 enum AVPixelFormat pix_fmt = pix_fmt_list[i];
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;
127 loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
129 dist = av_get_bits_per_pixel(av_pix_fmt_desc_get(pix_fmt));
130 if (dist < min_dist) {
132 dst_pix_fmt = pix_fmt;
140 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
141 enum AVPixelFormat src_pix_fmt,
142 int has_alpha, int *loss_ptr)
144 enum AVPixelFormat dst_pix_fmt;
146 static const int loss_mask_order[] = {
147 ~0, /* no loss first */
150 ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
156 /* try with successive loss */
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)
167 return AV_PIX_FMT_NONE;
170 *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
175 void ff_shrink22(uint8_t *dst, int dst_wrap,
176 const uint8_t *src, int src_wrap,
177 int width, int height)
180 const uint8_t *s1, *s2;
183 for(;height > 0; height--) {
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;
197 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
208 void ff_shrink44(uint8_t *dst, int dst_wrap,
209 const uint8_t *src, int src_wrap,
210 int width, int height)
213 const uint8_t *s1, *s2, *s3, *s4;
216 for(;height > 0; height--) {
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;
239 void ff_shrink88(uint8_t *dst, int dst_wrap,
240 const uint8_t *src, int src_wrap,
241 int width, int height)
245 for(;height > 0; height--) {
246 for(w = width;w > 0; w--) {
249 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
252 *(dst++) = (tmp + 32)>>6;
253 src += 8 - 8*src_wrap;
255 src += 8*src_wrap - 8*width;
256 dst += dst_wrap - width;
260 /* return true if yuv planar */
261 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
263 return (!(desc->flags & PIX_FMT_RGB) &&
264 (desc->flags & PIX_FMT_PLANAR));
267 int av_picture_crop(AVPicture *dst, const AVPicture *src,
268 enum AVPixelFormat pix_fmt, int top_band, int left_band)
270 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
274 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
277 y_shift = desc->log2_chroma_h;
278 x_shift = desc->log2_chroma_w;
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);
284 dst->linesize[0] = src->linesize[0];
285 dst->linesize[1] = src->linesize[1];
286 dst->linesize[2] = src->linesize[2];
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,
294 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
301 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
302 !is_yuv_planar(desc)) return -1;
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;
308 if (padtop || padleft) {
309 memset(dst->data[i], color[i],
310 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
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];
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];
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));
351 #if FF_API_DEINTERLACE
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,
361 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
364 for(;size > 0;size--) {
366 sum += lum_m3[0] << 2;
367 sum += lum_m2[0] << 1;
368 sum += lum_m1[0] << 2;
370 dst[0] = cm[(sum + 4) >> 3];
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)
384 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
387 for(;size > 0;size--) {
389 sum += lum_m3[0] << 2;
390 sum += lum_m2[0] << 1;
392 sum += lum_m1[0] << 2;
394 lum_m2[0] = cm[(sum + 4) >> 3];
402 #endif /* !HAVE_MMX_EXTERNAL */
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)
411 const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
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);
422 deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
426 src_p1 += 2*src_wrap;
427 src_p2 += 2*src_wrap;
430 memcpy(dst,src_m1,width);
433 deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
436 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
437 int width, int height)
439 uint8_t *src_m1, *src_0, *src_p1, *src_p2;
442 buf = av_malloc(width);
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);
453 src_p1 += 2*src_wrap;
454 src_p2 += 2*src_wrap;
457 deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
461 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
462 enum AVPixelFormat pix_fmt, int width, int height)
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)
474 if ((width & 3) != 0 || (height & 3) != 0)
480 case AV_PIX_FMT_YUVJ420P:
481 case AV_PIX_FMT_YUV420P:
485 case AV_PIX_FMT_YUV422P:
486 case AV_PIX_FMT_YUVJ422P:
489 case AV_PIX_FMT_YUV411P:
495 if (pix_fmt == AV_PIX_FMT_GRAY8) {
500 deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
503 deinterlace_bottom_field(dst->data[i],dst->linesize[i],
504 src->data[i], src->linesize[i],
512 #endif /* FF_API_DEINTERLACE */