summaryrefslogtreecommitdiff
path: root/test
diff options
context:
space:
mode:
Diffstat (limited to 'test')
0 files changed, 0 insertions, 0 deletions
mp;id=2bb6c9fbd2e2dac0b266b6762401db142fe47475'>src/cam/image.cpp
blob: fe2cc6da5a159822a5cd86623830c0a0d13834ad (plain)
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
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021, Ideas on Board Oy
 *
 * image.cpp - Multi-planar image with access to pixel data
 */

#include "image.h"

#include <assert.h>
#include <errno.h>
#include <iostream>
#include <map>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>

using namespace libcamera;

std::unique_ptr<Image> Image::fromFrameBuffer(const FrameBuffer *buffer, MapMode mode)
{
	std::unique_ptr<Image> image{ new Image() };

	assert(!buffer->planes().empty());

	int mmapFlags = 0;

	if (mode & MapMode::ReadOnly)
		mmapFlags |= PROT_READ;

	if (mode & MapMode::WriteOnly)
		mmapFlags |= PROT_WRITE;

	struct MappedBufferInfo {
		uint8_t *address = nullptr;
		size_t mapLength = 0;
		size_t dmabufLength = 0;
	};
	std::map<int, MappedBufferInfo> mappedBuffers;

	for (const FrameBuffer::Plane &plane : buffer->planes()) {
		const int fd = plane.fd.get();
		if (mappedBuffers.find(fd) == mappedBuffers.end()) {
			const size_t length = lseek(fd, 0, SEEK_END);
			mappedBuffers[fd] = MappedBufferInfo{ nullptr, 0, length };
		}

		const size_t length = mappedBuffers[fd].dmabufLength;

		if (plane.offset > length ||
		    plane.offset + plane.length > length) {
			std::cerr << "plane is out of buffer: buffer length="
				  << length << ", plane offset=" << plane.offset
				  << ", plane length=" << plane.length
				  << std::endl;
			return nullptr;
		}
		size_t &mapLength = mappedBuffers[fd].mapLength;
		mapLength = std::max(mapLength,
				     static_cast<size_t>(plane.offset + plane.length));
	}

	for (const FrameBuffer::Plane &plane : buffer->planes()) {
		const int fd = plane.fd.get();
		auto &info = mappedBuffers[fd];