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 #define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
44 #define deinterlace_line ff_deinterlace_line_mmx
46 #define deinterlace_line_inplace deinterlace_line_inplace_c
47 #define deinterlace_line deinterlace_line_c
50 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
52 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
53 *h_shift = desc->log2_chroma_w;
54 *v_shift = desc->log2_chroma_h;
57 static int is_gray(const AVPixFmtDescriptor *desc)
59 return desc->nb_components - (desc->flags & AV_PIX_FMT_FLAG_ALPHA) == 1;
62 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
63 enum AVPixelFormat src_pix_fmt,
66 const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
67 const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
68 int loss, i, nb_components = FFMIN(src_desc->nb_components,
69 dst_desc->nb_components);
74 if (dst_pix_fmt == src_pix_fmt)
77 for (i = 0; i < nb_components; i++)
78 if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1)
79 loss |= FF_LOSS_DEPTH;
81 if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
82 dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
83 loss |= FF_LOSS_RESOLUTION;
85 if ((src_desc->flags & AV_PIX_FMT_FLAG_RGB) != (dst_desc->flags & AV_PIX_FMT_FLAG_RGB))
86 loss |= FF_LOSS_COLORSPACE;
88 if (has_alpha && !(dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA) &&
89 (dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA))
90 loss |= FF_LOSS_ALPHA;
92 if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
93 return loss | FF_LOSS_COLORQUANT;
95 if (src_desc->nb_components > dst_desc->nb_components)
96 if (is_gray(dst_desc))
97 loss |= FF_LOSS_CHROMA;
102 static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list,
103 enum AVPixelFormat src_pix_fmt,
107 int dist, i, loss, min_dist;
108 enum AVPixelFormat dst_pix_fmt;
110 /* find exact color match with smallest size */
111 dst_pix_fmt = AV_PIX_FMT_NONE;
112 min_dist = 0x7fffffff;
114 while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
115 enum AVPixelFormat pix_fmt = pix_fmt_list[i];
117 if (i > AV_PIX_FMT_NB) {
118 av_log(NULL, AV_LOG_ERROR, "Pixel format list longer than expected, "
119 "it is either not properly terminated or contains duplicates\n");
120 return AV_PIX_FMT_NONE;
123 loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
125 dist = av_get_bits_per_pixel(av_pix_fmt_desc_get(pix_fmt));
126 if (dist < min_dist) {
128 dst_pix_fmt = pix_fmt;
136 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
137 enum AVPixelFormat src_pix_fmt,
138 int has_alpha, int *loss_ptr)
140 enum AVPixelFormat dst_pix_fmt;
142 static const int loss_mask_order[] = {
143 ~0, /* no loss first */
146 ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
152 /* try with successive loss */
155 loss_mask = loss_mask_order[i++];
156 dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_list, src_pix_fmt,
157 has_alpha, loss_mask);
158 if (dst_pix_fmt >= 0)
163 return AV_PIX_FMT_NONE;
166 *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
171 void ff_shrink22(uint8_t *dst, int dst_wrap,
172 const uint8_t *src, int src_wrap,
173 int width, int height)
176 const uint8_t *s1, *s2;
179 for(;height > 0; height--) {
183 for(w = width;w >= 4; w-=4) {
184 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
185 d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
186 d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
187 d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
193 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
204 void ff_shrink44(uint8_t *dst, int dst_wrap,
205 const uint8_t *src, int src_wrap,
206 int width, int height)
209 const uint8_t *s1, *s2, *s3, *s4;
212 for(;height > 0; height--) {
218 for(w = width;w > 0; w--) {
219 d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
220 s2[0] + s2[1] + s2[2] + s2[3] +
221 s3[0] + s3[1] + s3[2] + s3[3] +
222 s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
235 void ff_shrink88(uint8_t *dst, int dst_wrap,
236 const uint8_t *src, int src_wrap,
237 int width, int height)
241 for(;height > 0; height--) {
242 for(w = width;w > 0; w--) {
245 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
248 *(dst++) = (tmp + 32)>>6;
249 src += 8 - 8*src_wrap;
251 src += 8*src_wrap - 8*width;
252 dst += dst_wrap - width;
256 /* return true if yuv planar */
257 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
259 return (!(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
260 (desc->flags & AV_PIX_FMT_FLAG_PLANAR));
263 int av_picture_crop(AVPicture *dst, const AVPicture *src,
264 enum AVPixelFormat pix_fmt, int top_band, int left_band)
266 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
270 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
273 y_shift = desc->log2_chroma_h;
274 x_shift = desc->log2_chroma_w;
276 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
277 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
278 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
280 dst->linesize[0] = src->linesize[0];
281 dst->linesize[1] = src->linesize[1];
282 dst->linesize[2] = src->linesize[2];
286 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
287 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
290 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
297 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
298 !is_yuv_planar(desc)) return -1;
300 for (i = 0; i < 3; i++) {
301 x_shift = i ? desc->log2_chroma_w : 0;
302 y_shift = i ? desc->log2_chroma_h : 0;
304 if (padtop || padleft) {
305 memset(dst->data[i], color[i],
306 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
309 if (padleft || padright) {
310 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
311 (dst->linesize[i] - (padright >> x_shift));
312 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
313 for (y = 0; y < yheight; y++) {
314 memset(optr, color[i], (padleft + padright) >> x_shift);
315 optr += dst->linesize[i];
319 if (src) { /* first line */
320 uint8_t *iptr = src->data[i];
321 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
322 (padleft >> x_shift);
323 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
324 iptr += src->linesize[i];
325 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
326 (dst->linesize[i] - (padright >> x_shift));
327 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
328 for (y = 0; y < yheight; y++) {
329 memset(optr, color[i], (padleft + padright) >> x_shift);
330 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
331 (width - padleft - padright) >> x_shift);
332 iptr += src->linesize[i];
333 optr += dst->linesize[i];
337 if (padbottom || padright) {
338 optr = dst->data[i] + dst->linesize[i] *
339 ((height - padbottom) >> y_shift) - (padright >> x_shift);
340 memset(optr, color[i],dst->linesize[i] *
341 (padbottom >> y_shift) + (padright >> x_shift));
347 #if FF_API_DEINTERLACE
349 #if !HAVE_MMX_EXTERNAL
350 /* filter parameters: [-1 4 2 4 -1] // 8 */
351 static void deinterlace_line_c(uint8_t *dst,
352 const uint8_t *lum_m4, const uint8_t *lum_m3,
353 const uint8_t *lum_m2, const uint8_t *lum_m1,
357 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
360 for(;size > 0;size--) {
362 sum += lum_m3[0] << 2;
363 sum += lum_m2[0] << 1;
364 sum += lum_m1[0] << 2;
366 dst[0] = cm[(sum + 4) >> 3];
376 static void deinterlace_line_inplace_c(uint8_t *lum_m4, uint8_t *lum_m3,
377 uint8_t *lum_m2, uint8_t *lum_m1,
378 uint8_t *lum, int size)
380 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
383 for(;size > 0;size--) {
385 sum += lum_m3[0] << 2;
386 sum += lum_m2[0] << 1;
388 sum += lum_m1[0] << 2;
390 lum_m2[0] = cm[(sum + 4) >> 3];
398 #endif /* !HAVE_MMX_EXTERNAL */
400 /* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
401 top field is copied as is, but the bottom field is deinterlaced
402 against the top field. */
403 static void deinterlace_bottom_field(uint8_t *dst, int dst_wrap,
404 const uint8_t *src1, int src_wrap,
405 int width, int height)
407 const uint8_t *src_m2, *src_m1, *src_0, *src_p1, *src_p2;
412 src_0=&src_m1[src_wrap];
413 src_p1=&src_0[src_wrap];
414 src_p2=&src_p1[src_wrap];
415 for(y=0;y<(height-2);y+=2) {
416 memcpy(dst,src_m1,width);
418 deinterlace_line(dst,src_m2,src_m1,src_0,src_p1,src_p2,width);
422 src_p1 += 2*src_wrap;
423 src_p2 += 2*src_wrap;
426 memcpy(dst,src_m1,width);
429 deinterlace_line(dst,src_m2,src_m1,src_0,src_0,src_0,width);
432 static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
433 int width, int height)
435 uint8_t *src_m1, *src_0, *src_p1, *src_p2;
438 buf = av_malloc(width);
441 memcpy(buf,src_m1,width);
442 src_0=&src_m1[src_wrap];
443 src_p1=&src_0[src_wrap];
444 src_p2=&src_p1[src_wrap];
445 for(y=0;y<(height-2);y+=2) {
446 deinterlace_line_inplace(buf,src_m1,src_0,src_p1,src_p2,width);
449 src_p1 += 2*src_wrap;
450 src_p2 += 2*src_wrap;
453 deinterlace_line_inplace(buf,src_m1,src_0,src_0,src_0,width);
457 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
458 enum AVPixelFormat pix_fmt, int width, int height)
462 if (pix_fmt != AV_PIX_FMT_YUV420P &&
463 pix_fmt != AV_PIX_FMT_YUVJ420P &&
464 pix_fmt != AV_PIX_FMT_YUV422P &&
465 pix_fmt != AV_PIX_FMT_YUVJ422P &&
466 pix_fmt != AV_PIX_FMT_YUV444P &&
467 pix_fmt != AV_PIX_FMT_YUV411P &&
468 pix_fmt != AV_PIX_FMT_GRAY8)
470 if ((width & 3) != 0 || (height & 3) != 0)
476 case AV_PIX_FMT_YUVJ420P:
477 case AV_PIX_FMT_YUV420P:
481 case AV_PIX_FMT_YUV422P:
482 case AV_PIX_FMT_YUVJ422P:
485 case AV_PIX_FMT_YUV411P:
491 if (pix_fmt == AV_PIX_FMT_GRAY8) {
496 deinterlace_bottom_field_inplace(dst->data[i], dst->linesize[i],
499 deinterlace_bottom_field(dst->data[i],dst->linesize[i],
500 src->data[i], src->linesize[i],
508 #endif /* FF_API_DEINTERLACE */