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
30 #include "libavutil/avassert.h"
31 #include "libavutil/colorspace.h"
32 #include "libavutil/common.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/imgutils.h"
38 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
40 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
42 *h_shift = desc->log2_chroma_w;
43 *v_shift = desc->log2_chroma_h;
47 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
48 enum AVPixelFormat src_pix_fmt,
51 return av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
54 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
55 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
57 return av_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
60 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
61 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
63 return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
66 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
67 enum AVPixelFormat src_pix_fmt,
68 int has_alpha, int *loss_ptr){
71 enum AVPixelFormat best = AV_PIX_FMT_NONE;
74 for (i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++) {
76 best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, &loss);
84 FF_DISABLE_DEPRECATION_WARNINGS
85 /* return true if yuv planar */
86 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
89 int planes[4] = { 0 };
91 if ( desc->flags & AV_PIX_FMT_FLAG_RGB
92 || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
95 /* set the used planes */
96 for (i = 0; i < desc->nb_components; i++)
97 planes[desc->comp[i].plane] = 1;
99 /* if there is an unused plane, the format is not planar */
100 for (i = 0; i < desc->nb_components; i++)
106 int av_picture_crop(AVPicture *dst, const AVPicture *src,
107 enum AVPixelFormat pix_fmt, int top_band, int left_band)
109 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
114 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
117 y_shift = desc->log2_chroma_h;
118 x_shift = desc->log2_chroma_w;
119 av_image_fill_max_pixsteps(max_step, NULL, desc);
121 if (is_yuv_planar(desc)) {
122 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
123 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
124 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
126 if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
128 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + (left_band * max_step[0]);
131 dst->linesize[0] = src->linesize[0];
132 dst->linesize[1] = src->linesize[1];
133 dst->linesize[2] = src->linesize[2];
137 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
138 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
141 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
149 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
152 if (!is_yuv_planar(desc)) {
154 return -1; //TODO: Not yet implemented
156 av_image_fill_max_pixsteps(max_step, NULL, desc);
158 if (padtop || padleft) {
159 memset(dst->data[0], color[0],
160 dst->linesize[0] * padtop + (padleft * max_step[0]));
163 if (padleft || padright) {
164 optr = dst->data[0] + dst->linesize[0] * padtop +
165 (dst->linesize[0] - (padright * max_step[0]));
166 yheight = height - 1 - (padtop + padbottom);
167 for (y = 0; y < yheight; y++) {
168 memset(optr, color[0], (padleft + padright) * max_step[0]);
169 optr += dst->linesize[0];
173 if (padbottom || padright) {
174 optr = dst->data[0] + dst->linesize[0] * (height - padbottom) -
175 (padright * max_step[0]);
176 memset(optr, color[0], dst->linesize[0] * padbottom +
177 (padright * max_step[0]));
183 for (i = 0; i < 3; i++) {
184 x_shift = i ? desc->log2_chroma_w : 0;
185 y_shift = i ? desc->log2_chroma_h : 0;
187 if (padtop || padleft) {
188 memset(dst->data[i], color[i],
189 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
192 if (padleft || padright) {
193 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
194 (dst->linesize[i] - (padright >> x_shift));
195 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
196 for (y = 0; y < yheight; y++) {
197 memset(optr, color[i], (padleft + padright) >> x_shift);
198 optr += dst->linesize[i];
202 if (src) { /* first line */
203 uint8_t *iptr = src->data[i];
204 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
205 (padleft >> x_shift);
206 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
207 iptr += src->linesize[i];
208 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
209 (dst->linesize[i] - (padright >> x_shift));
210 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
211 for (y = 0; y < yheight; y++) {
212 memset(optr, color[i], (padleft + padright) >> x_shift);
213 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
214 (width - padleft - padright) >> x_shift);
215 iptr += src->linesize[i];
216 optr += dst->linesize[i];
220 if (padbottom || padright) {
221 optr = dst->data[i] + dst->linesize[i] *
222 ((height - padbottom) >> y_shift) - (padright >> x_shift);
223 memset(optr, color[i],dst->linesize[i] *
224 (padbottom >> y_shift) + (padright >> x_shift));
230 FF_ENABLE_DEPRECATION_WARNINGS
231 #endif /* FF_API_AVPICTURE */