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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/*
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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_SCREEN_CAPTURE_FRAME_QUEUE_H_
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#define MODULES_DESKTOP_CAPTURE_SCREEN_CAPTURE_FRAME_QUEUE_H_
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#include <memory>
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#include "rtc_base/constructormagic.h"
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// TODO(zijiehe): These headers are not used in this file, but to avoid build
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// break in remoting/host. We should add headers in each individual files.
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#include "modules/desktop_capture/desktop_frame.h" // Remove
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#include "modules/desktop_capture/shared_desktop_frame.h" // Remove
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namespace webrtc {
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// Represents a queue of reusable video frames. Provides access to the 'current'
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// frame - the frame that the caller is working with at the moment, and to the
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// 'previous' frame - the predecessor of the current frame swapped by
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// MoveToNextFrame() call, if any.
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//
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// The caller is expected to (re)allocate frames if current_frame() returns
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// NULL. The caller can mark all frames in the queue for reallocation (when,
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// say, frame dimensions change). The queue records which frames need updating
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// which the caller can query.
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//
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// Frame consumer is expected to never hold more than kQueueLength frames
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// created by this function and it should release the earliest one before trying
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// to capture a new frame (i.e. before MoveToNextFrame() is called).
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template <typename FrameType>
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class ScreenCaptureFrameQueue {
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public:
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ScreenCaptureFrameQueue() : current_(0) {}
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~ScreenCaptureFrameQueue() = default;
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// Moves to the next frame in the queue, moving the 'current' frame to become
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// the 'previous' one.
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void MoveToNextFrame() {
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current_ = (current_ + 1) % kQueueLength;
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}
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// Replaces the current frame with a new one allocated by the caller. The
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// existing frame (if any) is destroyed. Takes ownership of |frame|.
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void ReplaceCurrentFrame(std::unique_ptr<FrameType> frame) {
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frames_[current_] = std::move(frame);
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}
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// Marks all frames obsolete and resets the previous frame pointer. No
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// frames are freed though as the caller can still access them.
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void Reset() {
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for (int i = 0; i < kQueueLength; i++) {
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frames_[i].reset();
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}
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current_ = 0;
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}
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FrameType* current_frame() const {
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return frames_[current_].get();
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}
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FrameType* previous_frame() const {
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return frames_[(current_ + kQueueLength - 1) % kQueueLength].get();
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}
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private:
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// Index of the current frame.
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int current_;
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static const int kQueueLength = 2;
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std::unique_ptr<FrameType> frames_[kQueueLength];
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RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCaptureFrameQueue);
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};
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} // namespace webrtc
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#endif // MODULES_DESKTOP_CAPTURE_SCREEN_CAPTURE_FRAME_QUEUE_H_
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