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
|
/*
Copyright (C) 2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "decoder.h"
#include "decoder_factory.h"
#include "image_proxy.h"
#include "guess_crop.h"
#include "image.h"
#include "video_decoder.h"
using std::shared_ptr;
using namespace dcpomatic;
static Crop
guess_crop(shared_ptr<const Image> image, std::function<bool (int, int, int, bool)> predicate)
{
auto const width = image->size().width;
auto const height = image->size().height;
auto crop = Crop{};
for (auto y = 0; y < height; ++y) {
if (predicate(0, y, width, true)) {
crop.top = y;
break;
}
}
for (auto y = height - 1; y >= 0; --y) {
if (predicate(0, y, width, true)) {
crop.bottom = height - 1 - y;
break;
}
}
for (auto x = 0; x < width; ++x) {
if (predicate(x, 0, height, false)) {
crop.left = x;
break;
}
}
for (auto x = width - 1; x >= 0; --x) {
if (predicate(x, 0, height, false)) {
crop.right = width - 1 - x;
break;
}
}
return crop;
}
Crop
guess_crop_by_brightness(shared_ptr<const Image> image, double threshold)
{
std::function<bool (int, int, int, bool)> image_in_line = [image, threshold](int start_x, int start_y, int pixels, bool rows) {
double brightest = 0;
switch (image->pixel_format()) {
case AV_PIX_FMT_RGB24:
case AV_PIX_FMT_RGBA:
{
uint8_t const* data = image->data()[0] + start_x * std::lround(image->bytes_per_pixel(0)) + start_y * image->stride()[0];
for (int p = 0; p < pixels; ++p) {
/* Averaging R, G and B */
brightest = std::max(brightest, static_cast<double>(data[0] + data[1] + data[2]) / (3 * 256));
data += rows ? 3 : image->stride()[0];
}
break;
}
case AV_PIX_FMT_YUV420P:
{
uint8_t const* data = image->data()[0] + start_x + start_y * image->stride()[0];
for (int p = 0; p < pixels; ++p) {
/* Just using Y */
brightest = std::max(brightest, static_cast<double>(*data) / 256);
data += rows ? 1 : image->stride()[0];
}
break;
}
case AV_PIX_FMT_YUV422P10LE:
{
uint16_t const* data = reinterpret_cast<uint16_t*>(image->data()[0] + (start_x * 2) + (start_y * image->stride()[0]));
for (int p = 0; p < pixels; ++p) {
/* Just using Y */
brightest = std::max(brightest, static_cast<double>(*data) / 1024);
data += rows ? 1 : (image->stride()[0] / 2);
}
break;
}
case AV_PIX_FMT_XYZ12LE:
{
uint16_t const* data = reinterpret_cast<uint16_t*>(image->data()[0] + (start_x * 6) + (start_y * image->stride()[0]));
for (int p = 0; p < pixels; ++p) {
/* Just using Y */
brightest = std::max(brightest, static_cast<double>(data[1]) / 4096);
data += rows ? 3 : (image->stride()[0] / 2);
}
break;
}
default:
throw PixelFormatError("guess_crop_by_brightness()", image->pixel_format());
}
return brightest > threshold;
};
return guess_crop(image, image_in_line);
}
/** @param position Time within the content to get a video frame from when guessing the crop */
Crop
guess_crop_by_brightness(shared_ptr<const Film> film, shared_ptr<const Content> content, double threshold, ContentTime position)
{
DCPOMATIC_ASSERT (content->video);
auto decoder = decoder_factory (film, content, false, false, {});
DCPOMATIC_ASSERT (decoder->video);
bool done = false;
auto crop = Crop{};
auto handle_video = [&done, &crop, threshold](ContentVideo video) {
crop = guess_crop_by_brightness(video.image->image(Image::Alignment::COMPACT).image, threshold);
done = true;
};
decoder->video->Data.connect (handle_video);
decoder->seek (position, false);
int tries_left = 50;
while (!done && tries_left >= 0) {
decoder->pass();
--tries_left;
}
return crop;
}
Crop
guess_crop_by_alpha(shared_ptr<const Image> image)
{
std::function<bool (int, int, int, bool)> image_in_line = [image](int start_x, int start_y, int pixels, bool rows) {
switch (image->pixel_format()) {
case AV_PIX_FMT_RGBA:
{
int const increment = rows ? 3 : image->stride()[0];
uint8_t const* data = image->data()[0] + start_x * std::lround(image->bytes_per_pixel(0)) + start_y * image->stride()[0];
for (int p = 0; p < pixels; ++p) {
if (data[3]) {
return true;
}
data += increment;
}
return false;
}
default:
throw PixelFormatError("guess_crop_by_alpha()", image->pixel_format());
}
};
return guess_crop(image, image_in_line);
}
|
