2 * Misc image conversion routines
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
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
34 #include "imgconvert.h"
37 #include "libavutil/avassert.h"
38 #include "libavutil/colorspace.h"
39 #include "libavutil/common.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/internal.h"
42 #include "libavutil/imgutils.h"
44 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
46 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
48 *h_shift = desc->log2_chroma_w;
49 *v_shift = desc->log2_chroma_h;
52 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
53 enum AVPixelFormat src_pix_fmt,
56 return av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
59 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
60 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
62 return av_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
65 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
66 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
67 enum AVPixelFormat src_pix_fmt,
68 int has_alpha, int *loss_ptr){
69 return avcodec_find_best_pix_fmt_of_list(pix_fmt_list, src_pix_fmt, has_alpha, loss_ptr);
72 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
73 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
75 return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
79 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
80 enum AVPixelFormat src_pix_fmt,
81 int has_alpha, int *loss_ptr){
84 enum AVPixelFormat best = AV_PIX_FMT_NONE;
86 for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
87 best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
93 void ff_shrink22(uint8_t *dst, int dst_wrap,
94 const uint8_t *src, int src_wrap,
95 int width, int height)
98 const uint8_t *s1, *s2;
101 for(;height > 0; height--) {
105 for(w = width;w >= 4; w-=4) {
106 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
107 d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
108 d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
109 d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
115 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
126 void ff_shrink44(uint8_t *dst, int dst_wrap,
127 const uint8_t *src, int src_wrap,
128 int width, int height)
131 const uint8_t *s1, *s2, *s3, *s4;
134 for(;height > 0; height--) {
140 for(w = width;w > 0; w--) {
141 d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
142 s2[0] + s2[1] + s2[2] + s2[3] +
143 s3[0] + s3[1] + s3[2] + s3[3] +
144 s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
157 void ff_shrink88(uint8_t *dst, int dst_wrap,
158 const uint8_t *src, int src_wrap,
159 int width, int height)
163 for(;height > 0; height--) {
164 for(w = width;w > 0; w--) {
167 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
170 *(dst++) = (tmp + 32)>>6;
171 src += 8 - 8*src_wrap;
173 src += 8*src_wrap - 8*width;
174 dst += dst_wrap - width;
178 /* return true if yuv planar */
179 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
182 int planes[4] = { 0 };
184 if ( desc->flags & AV_PIX_FMT_FLAG_RGB
185 || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
188 /* set the used planes */
189 for (i = 0; i < desc->nb_components; i++)
190 planes[desc->comp[i].plane] = 1;
192 /* if there is an unused plane, the format is not planar */
193 for (i = 0; i < desc->nb_components; i++)
200 FF_DISABLE_DEPRECATION_WARNINGS
202 int av_picture_crop(AVPicture *dst, const AVPicture *src,
203 enum AVPixelFormat pix_fmt, int top_band, int left_band)
205 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
210 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
213 y_shift = desc->log2_chroma_h;
214 x_shift = desc->log2_chroma_w;
215 av_image_fill_max_pixsteps(max_step, NULL, desc);
217 if (is_yuv_planar(desc)) {
218 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
219 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
220 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
222 if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
224 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + (left_band * max_step[0]);
227 dst->linesize[0] = src->linesize[0];
228 dst->linesize[1] = src->linesize[1];
229 dst->linesize[2] = src->linesize[2];
233 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
234 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
237 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
245 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
248 if (!is_yuv_planar(desc)) {
250 return -1; //TODO: Not yet implemented
252 av_image_fill_max_pixsteps(max_step, NULL, desc);
254 if (padtop || padleft) {
255 memset(dst->data[0], color[0],
256 dst->linesize[0] * padtop + (padleft * max_step[0]));
259 if (padleft || padright) {
260 optr = dst->data[0] + dst->linesize[0] * padtop +
261 (dst->linesize[0] - (padright * max_step[0]));
262 yheight = height - 1 - (padtop + padbottom);
263 for (y = 0; y < yheight; y++) {
264 memset(optr, color[0], (padleft + padright) * max_step[0]);
265 optr += dst->linesize[0];
269 if (padbottom || padright) {
270 optr = dst->data[0] + dst->linesize[0] * (height - padbottom) -
271 (padright * max_step[0]);
272 memset(optr, color[0], dst->linesize[0] * padbottom +
273 (padright * max_step[0]));
279 for (i = 0; i < 3; i++) {
280 x_shift = i ? desc->log2_chroma_w : 0;
281 y_shift = i ? desc->log2_chroma_h : 0;
283 if (padtop || padleft) {
284 memset(dst->data[i], color[i],
285 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
288 if (padleft || padright) {
289 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
290 (dst->linesize[i] - (padright >> x_shift));
291 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
292 for (y = 0; y < yheight; y++) {
293 memset(optr, color[i], (padleft + padright) >> x_shift);
294 optr += dst->linesize[i];
298 if (src) { /* first line */
299 uint8_t *iptr = src->data[i];
300 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
301 (padleft >> x_shift);
302 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
303 iptr += src->linesize[i];
304 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
305 (dst->linesize[i] - (padright >> x_shift));
306 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
307 for (y = 0; y < yheight; y++) {
308 memset(optr, color[i], (padleft + padright) >> x_shift);
309 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
310 (width - padleft - padright) >> x_shift);
311 iptr += src->linesize[i];
312 optr += dst->linesize[i];
316 if (padbottom || padright) {
317 optr = dst->data[i] + dst->linesize[i] *
318 ((height - padbottom) >> y_shift) - (padright >> x_shift);
319 memset(optr, color[i],dst->linesize[i] *
320 (padbottom >> y_shift) + (padright >> x_shift));
334 for (i=0; i<AV_PIX_FMT_NB*2; i++) {
335 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
336 if(!desc || !desc->name) {
341 av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
344 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));
345 if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
346 av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
354 FF_ENABLE_DEPRECATION_WARNINGS
355 #endif /* FF_API_AVPICTURE */