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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/renderer/media/video_source_handler.h" |
| 6 |
| 7 #include <string> |
| 8 |
| 9 #include "base/logging.h" |
| 10 #include "content/renderer/media/media_stream_dependency_factory.h" |
| 11 #include "content/renderer/media/media_stream_registry_interface.h" |
| 12 #include "content/renderer/render_thread_impl.h" |
| 13 #include "third_party/libjingle/source/talk/media/base/videoframe.h" |
| 14 #include "third_party/libjingle/source/talk/media/base/videorenderer.h" |
| 15 #include "third_party/WebKit/Source/Platform/chromium/public/WebMediaStream.h" |
| 16 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaStreamRegistr
y.h" |
| 17 |
| 18 using cricket::VideoFrame; |
| 19 using cricket::VideoRenderer; |
| 20 using webrtc::VideoSourceInterface; |
| 21 |
| 22 namespace content { |
| 23 |
| 24 // PpFrameReceiver implements cricket::VideoRenderer so that it can be attached |
| 25 // to native video track's video source to receive the captured frame. |
| 26 // It can be attached to a FrameReaderInterface to output the received frame. |
| 27 class PpFrameReceiver : public cricket::VideoRenderer { |
| 28 public: |
| 29 PpFrameReceiver() : reader_(NULL) {} |
| 30 virtual ~PpFrameReceiver() {} |
| 31 |
| 32 // Implements VideoRenderer. |
| 33 virtual bool SetSize(int width, int height, int reserved) OVERRIDE { |
| 34 return true; |
| 35 } |
| 36 virtual bool RenderFrame(const cricket::VideoFrame* frame) OVERRIDE { |
| 37 base::AutoLock auto_lock(lock_); |
| 38 if (reader_) { |
| 39 // Make a shallow copy of the frame as the |reader_| may need to queue it. |
| 40 // Both frames will share a single reference-counted frame buffer. |
| 41 reader_->GotFrame(frame->Copy()); |
| 42 } |
| 43 return true; |
| 44 } |
| 45 |
| 46 void SetReader(FrameReaderInterface* reader) { |
| 47 base::AutoLock auto_lock(lock_); |
| 48 reader_ = reader; |
| 49 } |
| 50 |
| 51 private: |
| 52 FrameReaderInterface* reader_; |
| 53 base::Lock lock_; |
| 54 |
| 55 DISALLOW_COPY_AND_ASSIGN(PpFrameReceiver); |
| 56 }; |
| 57 |
| 58 VideoSourceHandler::VideoSourceHandler( |
| 59 MediaStreamDependencyFactory* factory, |
| 60 MediaStreamRegistryInterface* registry) |
| 61 : factory_(factory), |
| 62 registry_(registry) { |
| 63 ASSERT(factory_ != NULL); |
| 64 } |
| 65 |
| 66 VideoSourceHandler::~VideoSourceHandler() {} |
| 67 |
| 68 bool VideoSourceHandler::Open(const std::string& url, |
| 69 FrameReaderInterface* reader) { |
| 70 scoped_refptr<webrtc::VideoSourceInterface> source = GetFirstVideoSource(url); |
| 71 if (!source.get()) { |
| 72 return false; |
| 73 } |
| 74 PpFrameReceiver* receiver = new PpFrameReceiver(); |
| 75 receiver->SetReader(reader); |
| 76 source->AddSink(receiver); |
| 77 reader_to_receiver_[reader] = receiver; |
| 78 return true; |
| 79 } |
| 80 |
| 81 bool VideoSourceHandler::Close(const std::string& url, |
| 82 FrameReaderInterface* reader) { |
| 83 scoped_refptr<webrtc::VideoSourceInterface> source = GetFirstVideoSource(url); |
| 84 if (!source.get()) { |
| 85 LOG(ERROR) << "VideoSourceHandler::Close - Failed to get the video source " |
| 86 << "from MediaStream with url: " << url; |
| 87 return false; |
| 88 } |
| 89 PpFrameReceiver* receiver = |
| 90 static_cast<PpFrameReceiver*>(GetReceiver(reader)); |
| 91 receiver->SetReader(NULL); |
| 92 source->RemoveSink(receiver); |
| 93 reader_to_receiver_.erase(reader); |
| 94 return true; |
| 95 } |
| 96 |
| 97 scoped_refptr<VideoSourceInterface> VideoSourceHandler::GetFirstVideoSource( |
| 98 const std::string& url) { |
| 99 scoped_refptr<webrtc::VideoSourceInterface> source; |
| 100 WebKit::WebMediaStream stream; |
| 101 if (registry_) { |
| 102 stream = registry_->GetMediaStream(url); |
| 103 } else { |
| 104 stream = |
| 105 WebKit::WebMediaStreamRegistry::lookupMediaStreamDescriptor(GURL(url)); |
| 106 } |
| 107 if (stream.isNull() || !stream.extraData()) { |
| 108 LOG(ERROR) << "GetFirstVideoSource - invalid url: " << url; |
| 109 return source; |
| 110 } |
| 111 |
| 112 // Get the first video track from the stream. |
| 113 MediaStreamExtraData* extra_data = |
| 114 static_cast<MediaStreamExtraData*>(stream.extraData()); |
| 115 if (!extra_data) { |
| 116 LOG(ERROR) << "GetFirstVideoSource - MediaStreamExtraData is NULL."; |
| 117 return source; |
| 118 } |
| 119 webrtc::MediaStreamInterface* native_stream = extra_data->stream(); |
| 120 if (!native_stream) { |
| 121 LOG(ERROR) << "GetFirstVideoSource - native stream is NULL."; |
| 122 return source; |
| 123 } |
| 124 webrtc::VideoTrackVector native_video_tracks = |
| 125 native_stream->GetVideoTracks(); |
| 126 if (native_video_tracks.empty()) { |
| 127 LOG(ERROR) << "GetFirstVideoSource - stream has no video track."; |
| 128 return source; |
| 129 } |
| 130 source = native_video_tracks[0]->GetSource(); |
| 131 return source; |
| 132 } |
| 133 |
| 134 VideoRenderer* VideoSourceHandler::GetReceiver( |
| 135 FrameReaderInterface* reader) { |
| 136 std::map<FrameReaderInterface*, VideoRenderer*>::iterator it; |
| 137 it = reader_to_receiver_.find(reader); |
| 138 if (it == reader_to_receiver_.end()) { |
| 139 return NULL; |
| 140 } |
| 141 return it->second; |
| 142 } |
| 143 |
| 144 } // namespace content |
| 145 |
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