82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_
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#define MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_
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#include <stddef.h>
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#if defined(WEBRTC_WIN)
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#include <windows.h>
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#endif
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#include <memory>
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#include "rtc_base/constructor_magic.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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// SharedMemory is a base class for shared memory. It stores all required
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// parameters of the buffer, but doesn't have any logic to allocate or destroy
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// the actual buffer. DesktopCapturer consumers that need to use shared memory
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// for video frames must extend this class with creation and destruction logic
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// specific for the target platform and then call
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// DesktopCapturer::SetSharedMemoryFactory().
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class RTC_EXPORT SharedMemory {
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public:
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#if defined(WEBRTC_WIN)
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typedef HANDLE Handle;
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static const Handle kInvalidHandle;
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#else
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typedef int Handle;
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static const Handle kInvalidHandle;
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#endif
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void* data() const { return data_; }
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size_t size() const { return size_; }
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// Platform-specific handle of the buffer.
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Handle handle() const { return handle_; }
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// Integer identifier that can be used used by consumers of DesktopCapturer
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// interface to identify shared memory buffers it created.
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int id() const { return id_; }
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virtual ~SharedMemory() {}
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protected:
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SharedMemory(void* data, size_t size, Handle handle, int id);
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void* const data_;
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const size_t size_;
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const Handle handle_;
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const int id_;
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private:
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RTC_DISALLOW_COPY_AND_ASSIGN(SharedMemory);
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};
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// Interface used to create SharedMemory instances.
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class SharedMemoryFactory {
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public:
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SharedMemoryFactory() {}
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virtual ~SharedMemoryFactory() {}
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virtual std::unique_ptr<SharedMemory> CreateSharedMemory(size_t size) = 0;
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private:
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RTC_DISALLOW_COPY_AND_ASSIGN(SharedMemoryFactory);
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};
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} // namespace webrtc
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#endif // MODULES_DESKTOP_CAPTURE_SHARED_MEMORY_H_
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