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