151 lines
4.4 KiB
C++
151 lines
4.4 KiB
C++
/*
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* Copyright (c) 2011 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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#include "video_frames_queue.h"
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#ifdef WEBRTC_MODULE_UTILITY_VIDEO
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#include <cassert>
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#include "module_common_types.h"
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#include "tick_util.h"
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#include "trace.h"
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namespace webrtc {
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VideoFramesQueue::VideoFramesQueue()
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: _incomingFrames(),
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_renderDelayMs(10)
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{
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}
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VideoFramesQueue::~VideoFramesQueue()
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{
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while (!_incomingFrames.Empty())
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{
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ListItem* item = _incomingFrames.First();
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if (item)
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{
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VideoFrame* ptrFrame = static_cast<VideoFrame*>(item->GetItem());
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assert(ptrFrame != NULL);
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ptrFrame->Free();
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delete ptrFrame;
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}
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_incomingFrames.Erase(item);
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}
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while (!_emptyFrames.Empty())
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{
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ListItem* item = _emptyFrames.First();
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if (item)
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{
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VideoFrame* ptrFrame = static_cast<VideoFrame*>(item->GetItem());
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assert(ptrFrame != NULL);
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ptrFrame->Free();
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delete ptrFrame;
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}
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_emptyFrames.Erase(item);
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}
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}
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WebRtc_Word32 VideoFramesQueue::AddFrame(const VideoFrame& newFrame)
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{
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VideoFrame* ptrFrameToAdd = NULL;
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// Try to re-use a VideoFrame. Only allocate new memory if it is necessary.
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if (!_emptyFrames.Empty())
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{
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ListItem* item = _emptyFrames.First();
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if (item)
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{
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ptrFrameToAdd = static_cast<VideoFrame*>(item->GetItem());
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_emptyFrames.Erase(item);
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}
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}
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if (!ptrFrameToAdd)
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{
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if (_emptyFrames.GetSize() + _incomingFrames.GetSize() >
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KMaxNumberOfFrames)
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{
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WEBRTC_TRACE(kTraceWarning, kTraceVideoRenderer, -1,
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"%s: too many frames, limit: %d", __FUNCTION__,
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KMaxNumberOfFrames);
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return -1;
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}
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WEBRTC_TRACE(kTraceMemory, kTraceVideoRenderer, -1,
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"%s: allocating buffer %d", __FUNCTION__,
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_emptyFrames.GetSize() + _incomingFrames.GetSize());
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ptrFrameToAdd = new VideoFrame();
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if (!ptrFrameToAdd)
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{
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WEBRTC_TRACE(kTraceError, kTraceVideoRenderer, -1,
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"%s: could not create new frame for", __FUNCTION__);
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return -1;
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}
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}
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ptrFrameToAdd->CopyFrame(newFrame);
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_incomingFrames.PushBack(ptrFrameToAdd);
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return 0;
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}
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// Find the most recent frame that has a VideoFrame::RenderTimeMs() that is
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// lower than current time in ms (TickTime::MillisecondTimestamp()).
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// Note _incomingFrames is sorted so that the oldest frame is first.
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// Recycle all frames that are older than the most recent frame.
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VideoFrame* VideoFramesQueue::FrameToRecord()
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{
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VideoFrame* ptrRenderFrame = NULL;
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ListItem* item = _incomingFrames.First();
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while(item)
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{
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VideoFrame* ptrOldestFrameInList =
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static_cast<VideoFrame*>(item->GetItem());
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if (ptrOldestFrameInList->RenderTimeMs() <=
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TickTime::MillisecondTimestamp() + _renderDelayMs)
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{
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if (ptrRenderFrame)
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{
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// List is traversed beginning to end. If ptrRenderFrame is not
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// NULL it must be the first, and thus oldest, VideoFrame in the
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// queue. It can be recycled.
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ReturnFrame(ptrRenderFrame);
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_incomingFrames.PopFront();
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}
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item = _incomingFrames.Next(item);
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ptrRenderFrame = ptrOldestFrameInList;
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}else
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{
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// All VideoFrames following this one will be even newer. No match
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// will be found.
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break;
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}
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}
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return ptrRenderFrame;
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}
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WebRtc_Word32 VideoFramesQueue::ReturnFrame(VideoFrame* ptrOldFrame)
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{
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ptrOldFrame->SetTimeStamp(0);
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ptrOldFrame->SetWidth(0);
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ptrOldFrame->SetHeight(0);
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ptrOldFrame->SetRenderTime(0);
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ptrOldFrame->SetLength(0);
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_emptyFrames.PushBack(ptrOldFrame);
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return 0;
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}
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//
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WebRtc_Word32 VideoFramesQueue::SetRenderDelay(WebRtc_UWord32 renderDelay)
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{
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_renderDelayMs = renderDelay;
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return 0;
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}
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} // namespace webrtc
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#endif // WEBRTC_MODULE_UTILITY_VIDEO
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