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1 /*
2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #include "webrtc/modules/desktop_capture/screen_capture_frame_queue.h"
12 
13 #include <assert.h>
14 #include <algorithm>
15 
16 #include "webrtc/modules/desktop_capture/desktop_frame.h"
17 #include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
18 #include "webrtc/system_wrappers/include/logging.h"
19 #include "webrtc/typedefs.h"
20 
21 namespace webrtc {
22 
ScreenCaptureFrameQueue()23 ScreenCaptureFrameQueue::ScreenCaptureFrameQueue() : current_(0) {}
24 
~ScreenCaptureFrameQueue()25 ScreenCaptureFrameQueue::~ScreenCaptureFrameQueue() {}
26 
MoveToNextFrame()27 void ScreenCaptureFrameQueue::MoveToNextFrame() {
28   current_ = (current_ + 1) % kQueueLength;
29 
30   // Verify that the frame is not shared, i.e. that consumer has released it
31   // before attempting to capture again.
32   assert(!frames_[current_].get() || !frames_[current_]->IsShared());
33 }
34 
ReplaceCurrentFrame(DesktopFrame * frame)35 void ScreenCaptureFrameQueue::ReplaceCurrentFrame(DesktopFrame* frame) {
36   frames_[current_].reset(SharedDesktopFrame::Wrap(frame));
37 }
38 
Reset()39 void ScreenCaptureFrameQueue::Reset() {
40   for (int i = 0; i < kQueueLength; ++i)
41     frames_[i].reset();
42 }
43 
44 }  // namespace webrtc
45