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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/WebKit/Source/Platform/chromium/public/WebMediaStream.h" |
| 14 #include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaStreamRegistr
y.h" |
| 15 #include "third_party/libjingle/source/talk/media/base/videoframe.h" |
| 16 #include "third_party/libjingle/source/talk/media/base/videorenderer.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 MediaStreamRegistryInterface* registry) |
| 60 : registry_(registry) { |
| 61 } |
| 62 |
| 63 VideoSourceHandler::~VideoSourceHandler() {} |
| 64 |
| 65 bool VideoSourceHandler::Open(const std::string& url, |
| 66 FrameReaderInterface* reader) { |
| 67 scoped_refptr<webrtc::VideoSourceInterface> source = GetFirstVideoSource(url); |
| 68 if (!source.get()) { |
| 69 return false; |
| 70 } |
| 71 PpFrameReceiver* receiver = new PpFrameReceiver(); |
| 72 receiver->SetReader(reader); |
| 73 source->AddSink(receiver); |
| 74 reader_to_receiver_[reader] = receiver; |
| 75 return true; |
| 76 } |
| 77 |
| 78 bool VideoSourceHandler::Close(const std::string& url, |
| 79 FrameReaderInterface* reader) { |
| 80 scoped_refptr<webrtc::VideoSourceInterface> source = GetFirstVideoSource(url); |
| 81 if (!source.get()) { |
| 82 LOG(ERROR) << "VideoSourceHandler::Close - Failed to get the video source " |
| 83 << "from MediaStream with url: " << url; |
| 84 return false; |
| 85 } |
| 86 PpFrameReceiver* receiver = |
| 87 static_cast<PpFrameReceiver*>(GetReceiver(reader)); |
| 88 receiver->SetReader(NULL); |
| 89 source->RemoveSink(receiver); |
| 90 reader_to_receiver_.erase(reader); |
| 91 return true; |
| 92 } |
| 93 |
| 94 scoped_refptr<VideoSourceInterface> VideoSourceHandler::GetFirstVideoSource( |
| 95 const std::string& url) { |
| 96 scoped_refptr<webrtc::VideoSourceInterface> source; |
| 97 WebKit::WebMediaStream stream; |
| 98 if (registry_) { |
| 99 stream = registry_->GetMediaStream(url); |
| 100 } else { |
| 101 stream = |
| 102 WebKit::WebMediaStreamRegistry::lookupMediaStreamDescriptor(GURL(url)); |
| 103 } |
| 104 if (stream.isNull() || !stream.extraData()) { |
| 105 LOG(ERROR) << "GetFirstVideoSource - invalid url: " << url; |
| 106 return source; |
| 107 } |
| 108 |
| 109 // Get the first video track from the stream. |
| 110 MediaStreamExtraData* extra_data = |
| 111 static_cast<MediaStreamExtraData*>(stream.extraData()); |
| 112 if (!extra_data) { |
| 113 LOG(ERROR) << "GetFirstVideoSource - MediaStreamExtraData is NULL."; |
| 114 return source; |
| 115 } |
| 116 webrtc::MediaStreamInterface* native_stream = extra_data->stream(); |
| 117 if (!native_stream) { |
| 118 LOG(ERROR) << "GetFirstVideoSource - native stream is NULL."; |
| 119 return source; |
| 120 } |
| 121 webrtc::VideoTrackVector native_video_tracks = |
| 122 native_stream->GetVideoTracks(); |
| 123 if (native_video_tracks.empty()) { |
| 124 LOG(ERROR) << "GetFirstVideoSource - stream has no video track."; |
| 125 return source; |
| 126 } |
| 127 source = native_video_tracks[0]->GetSource(); |
| 128 return source; |
| 129 } |
| 130 |
| 131 VideoRenderer* VideoSourceHandler::GetReceiver( |
| 132 FrameReaderInterface* reader) { |
| 133 std::map<FrameReaderInterface*, VideoRenderer*>::iterator it; |
| 134 it = reader_to_receiver_.find(reader); |
| 135 if (it == reader_to_receiver_.end()) { |
| 136 return NULL; |
| 137 } |
| 138 return it->second; |
| 139 } |
| 140 |
| 141 } // namespace content |
| 142 |
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