summaryrefslogtreecommitdiff
path: root/libavcodec/imgconvert.c (plain)
blob: 1547f18966e09c5aa6cf3668b9aed3f6081deaea
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#include "avcodec.h"
28#include "internal.h"
29#include "mathops.h"
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"
36
37#if FF_API_GETCHROMA
38void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
39{
40 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
41 av_assert0(desc);
42 *h_shift = desc->log2_chroma_w;
43 *v_shift = desc->log2_chroma_h;
44}
45#endif
46
47int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
48 enum AVPixelFormat src_pix_fmt,
49 int has_alpha)
50{
51 return av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
52}
53
54enum 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)
56{
57 return av_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
58}
59
60enum 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)
62{
63 return avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
64}
65
66enum 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){
69 int i;
70
71 enum AVPixelFormat best = AV_PIX_FMT_NONE;
72
73 for(i=0; pix_fmt_list[i] != AV_PIX_FMT_NONE; i++)
74 best = avcodec_find_best_pix_fmt_of_2(best, pix_fmt_list[i], src_pix_fmt, has_alpha, loss_ptr);
75
76 return best;
77}
78
79#if FF_API_AVPICTURE
80FF_DISABLE_DEPRECATION_WARNINGS
81/* return true if yuv planar */
82static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
83{
84 int i;
85 int planes[4] = { 0 };
86
87 if ( desc->flags & AV_PIX_FMT_FLAG_RGB
88 || !(desc->flags & AV_PIX_FMT_FLAG_PLANAR))
89 return 0;
90
91 /* set the used planes */
92 for (i = 0; i < desc->nb_components; i++)
93 planes[desc->comp[i].plane] = 1;
94
95 /* if there is an unused plane, the format is not planar */
96 for (i = 0; i < desc->nb_components; i++)
97 if (!planes[i])
98 return 0;
99 return 1;
100}
101
102int av_picture_crop(AVPicture *dst, const AVPicture *src,
103 enum AVPixelFormat pix_fmt, int top_band, int left_band)
104{
105 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
106 int y_shift;
107 int x_shift;
108 int max_step[4];
109
110 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
111 return -1;
112
113 y_shift = desc->log2_chroma_h;
114 x_shift = desc->log2_chroma_w;
115 av_image_fill_max_pixsteps(max_step, NULL, desc);
116
117 if (is_yuv_planar(desc)) {
118 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
119 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
120 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
121 } else{
122 if(top_band % (1<<y_shift) || left_band % (1<<x_shift))
123 return -1;
124 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + (left_band * max_step[0]);
125 }
126
127 dst->linesize[0] = src->linesize[0];
128 dst->linesize[1] = src->linesize[1];
129 dst->linesize[2] = src->linesize[2];
130 return 0;
131}
132
133int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
134 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
135 int *color)
136{
137 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
138 uint8_t *optr;
139 int y_shift;
140 int x_shift;
141 int yheight;
142 int i, y;
143 int max_step[4];
144
145 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
146 return -1;
147
148 if (!is_yuv_planar(desc)) {
149 if (src)
150 return -1; //TODO: Not yet implemented
151
152 av_image_fill_max_pixsteps(max_step, NULL, desc);
153
154 if (padtop || padleft) {
155 memset(dst->data[0], color[0],
156 dst->linesize[0] * padtop + (padleft * max_step[0]));
157 }
158
159 if (padleft || padright) {
160 optr = dst->data[0] + dst->linesize[0] * padtop +
161 (dst->linesize[0] - (padright * max_step[0]));
162 yheight = height - 1 - (padtop + padbottom);
163 for (y = 0; y < yheight; y++) {
164 memset(optr, color[0], (padleft + padright) * max_step[0]);
165 optr += dst->linesize[0];
166 }
167 }
168
169 if (padbottom || padright) {
170 optr = dst->data[0] + dst->linesize[0] * (height - padbottom) -
171 (padright * max_step[0]);
172 memset(optr, color[0], dst->linesize[0] * padbottom +
173 (padright * max_step[0]));
174 }
175
176 return 0;
177 }
178
179 for (i = 0; i < 3; i++) {
180 x_shift = i ? desc->log2_chroma_w : 0;
181 y_shift = i ? desc->log2_chroma_h : 0;
182
183 if (padtop || padleft) {
184 memset(dst->data[i], color[i],
185 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
186 }
187
188 if (padleft || padright) {
189 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
190 (dst->linesize[i] - (padright >> x_shift));
191 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
192 for (y = 0; y < yheight; y++) {
193 memset(optr, color[i], (padleft + padright) >> x_shift);
194 optr += dst->linesize[i];
195 }
196 }
197
198 if (src) { /* first line */
199 uint8_t *iptr = src->data[i];
200 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
201 (padleft >> x_shift);
202 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
203 iptr += src->linesize[i];
204 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
205 (dst->linesize[i] - (padright >> x_shift));
206 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
207 for (y = 0; y < yheight; y++) {
208 memset(optr, color[i], (padleft + padright) >> x_shift);
209 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
210 (width - padleft - padright) >> x_shift);
211 iptr += src->linesize[i];
212 optr += dst->linesize[i];
213 }
214 }
215
216 if (padbottom || padright) {
217 optr = dst->data[i] + dst->linesize[i] *
218 ((height - padbottom) >> y_shift) - (padright >> x_shift);
219 memset(optr, color[i],dst->linesize[i] *
220 (padbottom >> y_shift) + (padright >> x_shift));
221 }
222 }
223
224 return 0;
225}
226FF_ENABLE_DEPRECATION_WARNINGS
227#endif /* FF_API_AVPICTURE */
228
generated by cgit at 2024-05-17 15:55:50 (GMT)