mirror of
https://github.com/outbackdingo/UltraGrid.git
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f336e016f5
This fix prevents multiple instances trying to write frames into the shared memory at the same time. Now, only the instance that created the shared memory can write to it.
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/**
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* @file shared_mem_frame.hpp
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* @author Martin Piatka <piatka@cesnet.cz>
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*/
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/*
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* Copyright (c) 2018 CESNET, z. s. p. o.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SHARED_MEM_FRAME_HPP
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#define SHARED_MEM_FRAME_HPP
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#include <QSharedMemory>
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#ifndef GUI_BUILD
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#include "types.h"
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#endif // GUI_BUILD
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struct Shared_mem_frame{
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int width, height;
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bool should_detach;
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unsigned char pixels[];
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};
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class Shared_mem{
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public:
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Shared_mem(const char *key);
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Shared_mem();
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~Shared_mem();
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bool create();
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bool attach();
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bool detach();
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bool is_attached();
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bool lock();
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bool unlock();
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void destroy();
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void setKey(const char *key);
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#ifndef GUI_BUILD
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void put_frame(struct video_frame *frame);
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#endif // GUI_BUILD
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Shared_mem_frame *get_frame_and_lock();
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private:
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size_t mem_size;
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bool locked;
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bool owner;
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QSharedMemory shared_mem;
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#ifndef GUI_BUILD
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void check_reconf(struct video_desc in_desc);
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static const codec_t preview_codec = RGB;
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int scaledW, scaledH;
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int scaleF;
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int scaledW_pad;
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struct video_desc desc = {};
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std::vector<unsigned char> scaled_frame;
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bool reconfiguring = false;
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#endif // GUI_BUILD
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};
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#endif
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