Ichthyostega
ae74bd323e
- setup a IORING_OP_TIMEOUT to drive the frame loop - use the status mark of buffers ahead to supply new IORING_OP_READ - rely on two running framecount cursors with modulus to map onto buffer slots
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
/*
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commons.hpp - common definitions and utils for the io_uring video output demo code
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Copyright (C)
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2026 Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU GPL version 2+ See the LICENSE file for details.
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* ************************************************************************/
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#ifndef COMMONS_H
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#define COMMONS_H
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#include <cstdint>
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#include <iostream>
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#include <chrono>
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#include <string>
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#include <linux/time_types.h> // for struct __kernel_timespec
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using std::string;
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using uint = unsigned int;
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using FrameRate = uint;
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inline void
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__FAIL (string msg)
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{
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std::cerr << "FAIL: " << msg << std::endl;
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std::abort();
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}
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/**
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* Marker class: any copy and copy construction prohibited
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*/
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class NonCopyable
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{
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protected:
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~NonCopyable() = default;
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NonCopyable() = default;
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NonCopyable (NonCopyable const&) = delete;
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NonCopyable& operator= (NonCopyable const&) = delete;
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};
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/**
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* Generate a kernel timespec from a given C++ chrono duration
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*/
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template<class REP, class SCALE>
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constexpr struct __kernel_timespec
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asKernelTimespec (std::chrono::duration<REP, SCALE> dur)
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{
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using namespace std::chrono;
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auto secs = duration_cast<seconds>(dur);
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auto nsecs = duration_cast<nanoseconds>(dur - secs);
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return __kernel_timespec{ static_cast<long long> (secs.count())
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, static_cast<long long> (nsecs.count())
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};
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}
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#endif /*COMMONS_H*/
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