mirror of
https://github.com/wpilibsuite/allwpilib
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61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2016-2017 FIRST. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#ifndef CSCORE_USBCAMERABUFFER_H_
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#define CSCORE_USBCAMERABUFFER_H_
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#ifdef __linux__
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#include <sys/mman.h>
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#endif
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#include <utility>
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namespace cs {
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class UsbCameraBuffer {
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public:
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UsbCameraBuffer() noexcept : m_data{nullptr}, m_length{0} {}
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UsbCameraBuffer(UsbCameraBuffer&& other) noexcept : UsbCameraBuffer() {
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swap(*this, other);
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}
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UsbCameraBuffer& operator=(UsbCameraBuffer&& other) noexcept {
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swap(*this, other);
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return *this;
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}
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UsbCameraBuffer(const UsbCameraBuffer&) = delete;
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UsbCameraBuffer& operator=(const UsbCameraBuffer&) = delete;
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#ifdef __linux__
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UsbCameraBuffer(int fd, size_t length, off_t offset) noexcept
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: m_length{length} {
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m_data =
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mmap(nullptr, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset);
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if (m_data == MAP_FAILED) {
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m_data = nullptr;
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m_length = 0;
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}
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}
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~UsbCameraBuffer() {
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if (m_data) munmap(m_data, m_length);
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}
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#endif
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friend void swap(UsbCameraBuffer& first, UsbCameraBuffer& second) noexcept {
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using std::swap;
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swap(first.m_data, second.m_data);
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swap(first.m_length, second.m_length);
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}
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void* m_data;
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size_t m_length;
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};
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} // namespace cs
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#endif // CSCORE_USBCAMERABUFFER_H_
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