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path: root/libavfilter/vf_swaprect.c (plain)
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1/*
2 * Copyright (c) 2015 Paul B. Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "libavutil/avstring.h"
22#include "libavutil/eval.h"
23#include "libavutil/imgutils.h"
24#include "libavutil/opt.h"
25#include "libavutil/pixdesc.h"
26
27#include "avfilter.h"
28#include "formats.h"
29#include "internal.h"
30#include "video.h"
31
32typedef struct SwapRectContext {
33 const AVClass *class;
34 char *w, *h;
35 char *x1, *y1;
36 char *x2, *y2;
37
38 int nb_planes;
39 int pixsteps[4];
40
41 const AVPixFmtDescriptor *desc;
42 uint8_t *temp;
43} SwapRectContext;
44
45#define OFFSET(x) offsetof(SwapRectContext, x)
46#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
47static const AVOption swaprect_options[] = {
48 { "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
49 { "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
50 { "x1", "set 1st rect x top left coordinate", OFFSET(x1), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
51 { "y1", "set 1st rect y top left coordinate", OFFSET(y1), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
52 { "x2", "set 2nd rect x top left coordinate", OFFSET(x2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
53 { "y2", "set 2nd rect y top left coordinate", OFFSET(y2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
54 { NULL },
55};
56
57AVFILTER_DEFINE_CLASS(swaprect);
58
59static int query_formats(AVFilterContext *ctx)
60{
61 AVFilterFormats *pix_fmts = NULL;
62 int fmt, ret;
63
64 for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
65 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
66 if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
67 desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
68 desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
69 (ret = ff_add_format(&pix_fmts, fmt)) < 0)
70 return ret;
71 }
72
73 return ff_set_common_formats(ctx, pix_fmts);
74}
75
76static const char *const var_names[] = { "w", "h", "a", "n", "t", "pos", "sar", "dar", NULL };
77enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T, VAR_POS, VAR_SAR, VAR_DAR, VAR_VARS_NB };
78
79static int filter_frame(AVFilterLink *inlink, AVFrame *in)
80{
81 AVFilterContext *ctx = inlink->dst;
82 AVFilterLink *outlink = ctx->outputs[0];
83 SwapRectContext *s = ctx->priv;
84 double var_values[VAR_VARS_NB];
85 int x1[4], y1[4];
86 int x2[4], y2[4];
87 int aw[4], ah[4];
88 int lw[4], lh[4];
89 int pw[4], ph[4];
90 double dw, dh;
91 double dx1, dy1;
92 double dx2, dy2;
93 int y, p, w, h, ret;
94
95 var_values[VAR_W] = inlink->w;
96 var_values[VAR_H] = inlink->h;
97 var_values[VAR_A] = (float) inlink->w / inlink->h;
98 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
99 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
100 var_values[VAR_N] = inlink->frame_count_out;
101 var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
102 var_values[VAR_POS] = av_frame_get_pkt_pos(in) == -1 ? NAN : av_frame_get_pkt_pos(in);
103
104 ret = av_expr_parse_and_eval(&dw, s->w,
105 var_names, &var_values[0],
106 NULL, NULL, NULL, NULL,
107 0, 0, ctx);
108 if (ret < 0)
109 return ret;
110
111 ret = av_expr_parse_and_eval(&dh, s->h,
112 var_names, &var_values[0],
113 NULL, NULL, NULL, NULL,
114 0, 0, ctx);
115 if (ret < 0)
116 return ret;
117
118 ret = av_expr_parse_and_eval(&dx1, s->x1,
119 var_names, &var_values[0],
120 NULL, NULL, NULL, NULL,
121 0, 0, ctx);
122 if (ret < 0)
123 return ret;
124
125 ret = av_expr_parse_and_eval(&dy1, s->y1,
126 var_names, &var_values[0],
127 NULL, NULL, NULL, NULL,
128 0, 0, ctx);
129 if (ret < 0)
130 return ret;
131
132 ret = av_expr_parse_and_eval(&dx2, s->x2,
133 var_names, &var_values[0],
134 NULL, NULL, NULL, NULL,
135 0, 0, ctx);
136 if (ret < 0)
137 return ret;
138
139 ret = av_expr_parse_and_eval(&dy2, s->y2,
140 var_names, &var_values[0],
141 NULL, NULL, NULL, NULL,
142 0, 0, ctx);
143 if (ret < 0)
144 return ret;
145
146 w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
147
148 x1[0] = av_clip(x1[0], 0, inlink->w - 1);
149 y1[0] = av_clip(y1[0], 0, inlink->w - 1);
150
151 x2[0] = av_clip(x2[0], 0, inlink->w - 1);
152 y2[0] = av_clip(y2[0], 0, inlink->w - 1);
153
154 ah[1] = ah[2] = FF_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
155 ah[0] = ah[3] = h;
156 aw[1] = aw[2] = FF_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
157 aw[0] = aw[3] = w;
158
159 w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
160 h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
161
162 ph[1] = ph[2] = FF_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
163 ph[0] = ph[3] = h;
164 pw[1] = pw[2] = FF_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
165 pw[0] = pw[3] = w;
166
167 lh[1] = lh[2] = FF_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
168 lh[0] = lh[3] = inlink->h;
169 lw[1] = lw[2] = FF_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
170 lw[0] = lw[3] = inlink->w;
171
172 x1[1] = x1[2] = FF_CEIL_RSHIFT(x1[0], s->desc->log2_chroma_w);
173 x1[0] = x1[3] = x1[0];
174 y1[1] = y1[2] = FF_CEIL_RSHIFT(y1[0], s->desc->log2_chroma_h);
175 y1[0] = y1[3] = y1[0];
176
177 x2[1] = x2[2] = FF_CEIL_RSHIFT(x2[0], s->desc->log2_chroma_w);
178 x2[0] = x2[3] = x2[0];
179 y2[1] = y2[2] = FF_CEIL_RSHIFT(y2[0], s->desc->log2_chroma_h);
180 y2[0] = y2[3] = y2[0];
181
182 for (p = 0; p < s->nb_planes; p++) {
183 if (ph[p] == ah[p] && pw[p] == aw[p]) {
184 uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
185 uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
186
187 for (y = 0; y < ph[p]; y++) {
188 memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
189 memmove(src, dst, pw[p] * s->pixsteps[p]);
190 memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
191 src += in->linesize[p];
192 dst += in->linesize[p];
193 }
194 }
195 }
196
197 return ff_filter_frame(outlink, in);
198}
199
200static int config_input(AVFilterLink *inlink)
201{
202 AVFilterContext *ctx = inlink->dst;
203 SwapRectContext *s = ctx->priv;
204
205 if (!s->w || !s->h ||
206 !s->x1 || !s->y1 ||
207 !s->x2 || !s->y2)
208 return AVERROR(EINVAL);
209
210 s->desc = av_pix_fmt_desc_get(inlink->format);
211 av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
212 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
213
214 s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
215 if (!s->temp)
216 return AVERROR(ENOMEM);
217
218 return 0;
219}
220
221static av_cold void uninit(AVFilterContext *ctx)
222{
223 SwapRectContext *s = ctx->priv;
224 av_freep(&s->temp);
225}
226
227static const AVFilterPad inputs[] = {
228 {
229 .name = "default",
230 .type = AVMEDIA_TYPE_VIDEO,
231 .filter_frame = filter_frame,
232 .config_props = config_input,
233 .needs_writable = 1,
234 },
235 { NULL }
236};
237
238static const AVFilterPad outputs[] = {
239 {
240 .name = "default",
241 .type = AVMEDIA_TYPE_VIDEO,
242 },
243 { NULL }
244};
245
246AVFilter ff_vf_swaprect = {
247 .name = "swaprect",
248 .description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
249 .priv_size = sizeof(SwapRectContext),
250 .priv_class = &swaprect_class,
251 .query_formats = query_formats,
252 .uninit = uninit,
253 .inputs = inputs,
254 .outputs = outputs,
255 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
256};
257
generated by cgit at 2024-05-17 15:56:56 (GMT)