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
|
/*
* Copyright (c) 2017 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/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct LumakeyContext {
const AVClass *class;
double threshold;
double tolerance;
double softness;
int white;
int black;
int so;
int max;
int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} LumakeyContext;
static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
LumakeyContext *s = ctx->priv;
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3];
const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0];
const int so = s->so;
const int w = s->white;
const int b = s->black;
int x, y;
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < frame->width; x++) {
if (luma[x] >= b && luma[x] <= w) {
alpha[x] = 0;
} else if (luma[x] > b - so && luma[x] < w + so) {
if (luma[x] < b) {
alpha[x] = 255 - (luma[x] - b + so) * 255 / so;
} else {
alpha[x] = (luma[x] - w) * 255 / so;
}
}
}
luma += frame->linesize[0];
alpha += frame->linesize[3];
}
return 0;
}
static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
LumakeyContext *s = ctx->priv;
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]);
const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]);
const int so = s->so;
const int w = s->white;
const int b = s->black;
const int m = s->max;
int x, y;
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < frame->width; x++) {
if (luma[x] >= b && luma[x] <= w) {
alpha[x] = 0;
} else if (luma[x] > b - so && luma[x] < w + so) {
if (luma[x] < b) {
alpha[x] = m - (luma[x] - b + so) * m / so;
} else {
alpha[x] = (luma[x] - w) * m / so;
}
}
}
luma += frame->linesize[0] / 2;
alpha += frame->linesize[3] / 2;
}
return 0;
}
static int config_input(AVFilterLink *inlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
AVFilterContext *ctx = inlink->dst;
LumakeyContext *s = ctx->priv;
int depth;
depth = desc->comp[0].depth;
if (depth == 8) {
s->white = av_clip_uint8((s->threshold + s->tolerance) * 255);
s->black = av_clip_uint8((s->threshold - s->tolerance) * 255);
s->do_lumakey_slice = do_lumakey_slice8;
s->so = s->softness * 255;
} else {
s->max = (1 << depth) - 1;
s->white = av_clip((s->threshold + s->tolerance) * s->max, 0, s->max);
s->black = av_clip((s->threshold - s->tolerance) * s->max, 0, s->max);
s->do_lumakey_slice = do_lumakey_slice16;
s->so = s->softness * s->max;
}
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
LumakeyContext *s = ctx->priv;
int ret;
if (ret = ff_filter_execute(ctx, s->do_lumakey_slice, frame, NULL,
FFMIN(frame->height, ff_filter_get_nb_threads(ctx))))
return ret;
return ff_filter_frame(ctx->outputs[0], frame);
}
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9,
AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10,
AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA422P12,
AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_NONE
};
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
return config_input(ctx->inputs[0]);
}
static const AVFilterPad lumakey_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad lumakey_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
#define OFFSET(x) offsetof(LumakeyContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption lumakey_options[] = {
{ "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
{ "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_DOUBLE, {.dbl=0.01}, 0, 1, FLAGS },
{ "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(lumakey);
const AVFilter ff_vf_lumakey = {
.name = "lumakey",
.description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."),
.priv_size = sizeof(LumakeyContext),
.priv_class = &lumakey_class,
FILTER_INPUTS(lumakey_inputs),
FILTER_OUTPUTS(lumakey_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
|
