src/remoting/host/video_frame_recorder_host_extension.cc

   1 // Copyright 2014 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 "remoting/host/video_frame_recorder_host_extension.h"
   6
   7 #include "base/base64.h"
   8 #include "base/json/json_reader.h"
   9 #include "base/json/json_writer.h"
  10 #include "base/logging.h"
  11 #include "base/values.h"
  12 #include "remoting/codec/video_encoder_verbatim.h"
  13 #include "remoting/host/host_extension_session.h"
  14 #include "remoting/host/video_frame_recorder.h"
  15 #include "remoting/proto/control.pb.h"
  16 #include "remoting/proto/video.pb.h"
  17 #include "remoting/protocol/client_stub.h"
  18 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
  19
  20 namespace remoting {
  21
  22 namespace {
  23
  24 const char kVideoRecorderCapabilities[] = "videoRecorder";
  25
  26 const char kVideoRecorderType[] = "video-recorder";
  27
  28 const char kType[] = "type";
  29 const char kData[] = "data";
  30
  31 const char kStartType[] = "start";
  32 const char kStopType[] = "stop";
  33 const char kNextFrameType[] = "next-frame";
  34 const char kNextFrameReplyType[] = "next-frame-reply";
  35
  36 class VideoFrameRecorderHostExtensionSession : public HostExtensionSession {
  37  public:
  38   explicit VideoFrameRecorderHostExtensionSession(int64_t max_content_bytes);
  39   virtual ~VideoFrameRecorderHostExtensionSession() {}
  40
  41   // remoting::HostExtensionSession interface.
  42   virtual scoped_ptr<VideoEncoder> OnCreateVideoEncoder(
  43       scoped_ptr<VideoEncoder> encoder) OVERRIDE;
  44   virtual bool ModifiesVideoPipeline() const OVERRIDE;
  45   virtual bool OnExtensionMessage(
  46       ClientSessionControl* client_session_control,
  47       protocol::ClientStub* client_stub,
  48       const protocol::ExtensionMessage& message) OVERRIDE;
  49
  50  private:
  51   VideoEncoderVerbatim verbatim_encoder;
  52   VideoFrameRecorder video_frame_recorder;
  53   bool first_frame_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(VideoFrameRecorderHostExtensionSession);
  56 };
  57
  58 VideoFrameRecorderHostExtensionSession::VideoFrameRecorderHostExtensionSession(
  59     int64_t max_content_bytes) : first_frame_(false) {
  60   video_frame_recorder.SetMaxContentBytes(max_content_bytes);
  61 }
  62
  63 scoped_ptr<VideoEncoder>
  64 VideoFrameRecorderHostExtensionSession::OnCreateVideoEncoder(
  65     scoped_ptr<VideoEncoder> encoder) {
  66   video_frame_recorder.DetachVideoEncoderWrapper();
  67   return video_frame_recorder.WrapVideoEncoder(encoder.Pass());
  68 }
  69
  70 bool VideoFrameRecorderHostExtensionSession::ModifiesVideoPipeline() const {
  71   return true;
  72 }
  73
  74 bool VideoFrameRecorderHostExtensionSession::OnExtensionMessage(
  75     ClientSessionControl* client_session_control,
  76     protocol::ClientStub* client_stub,
  77     const protocol::ExtensionMessage& message) {
  78   if (message.type() != kVideoRecorderType) {
  79     return false;
  80   }
  81
  82   if (!message.has_data()) {
  83     return true;
  84   }
  85
  86   scoped_ptr<base::Value> value(base::JSONReader::Read(message.data()));
  87   base::DictionaryValue* client_message;
  88   if (value && value->GetAsDictionary(&client_message)) {
  89     std::string type;
  90     if (!client_message->GetString(kType, &type)) {
  91       LOG(ERROR) << "Invalid video-recorder message";
  92       return true;
  93     }
  94
  95     if (type == kStartType) {
  96       video_frame_recorder.SetEnableRecording(true);
  97       first_frame_ = true;
  98     } else if (type == kStopType) {
  99       video_frame_recorder.SetEnableRecording(false);
 100     } else if (type == kNextFrameType) {
 101       scoped_ptr<webrtc::DesktopFrame> frame(video_frame_recorder.NextFrame());
 102
 103       // TODO(wez): This involves six copies of the entire frame.
 104       // See if there's some way to optimize at least a few of them out.
 105       base::DictionaryValue reply_message;
 106       reply_message.SetString(kType, kNextFrameReplyType);
 107       if (frame) {
 108         // If this is the first frame then override the updated region so that
 109         // the encoder will send the whole frame's contents.
 110         if (first_frame_) {
 111           first_frame_ = false;
 112
 113           frame->mutable_updated_region()->SetRect(
 114               webrtc::DesktopRect::MakeSize(frame->size()));
 115         }
 116
 117         // Encode the frame into a raw ARGB VideoPacket.
 118         scoped_ptr<VideoPacket> encoded_frame(
 119             verbatim_encoder.Encode(*frame));
 120
 121         // Serialize that packet into a string.
 122         std::string data;
 123         data.resize(encoded_frame->ByteSize());
 124         encoded_frame->SerializeWithCachedSizesToArray(
 125             reinterpret_cast<uint8_t*>(&data[0]));
 126
 127         // Convert that string to Base64, so it's JSON-friendly.
 128         std::string base64_data;
 129         base::Base64Encode(data, &base64_data);
 130
 131         // Copy the Base64 data into the message.
 132         reply_message.SetString(kData, base64_data);
 133       }
 134
 135       // JSON-encode the reply into a string.
 136       std::string reply_json;
 137       if (!base::JSONWriter::Write(&reply_message, &reply_json)) {
 138         LOG(ERROR) << "Failed to create reply json";
 139         return true;
 140       }
 141
 142       // Return the frame (or a 'data'-less reply) to the client.
 143       protocol::ExtensionMessage message;
 144       message.set_type(kVideoRecorderType);
 145       message.set_data(reply_json);
 146       client_stub->DeliverHostMessage(message);
 147     }
 148   }
 149
 150   return true;
 151 }
 152
 153 } // namespace
 154
 155 void VideoFrameRecorderHostExtension::SetMaxContentBytes(
 156     int64_t max_content_bytes) {
 157   max_content_bytes_ = max_content_bytes;
 158 }
 159
 160 std::string VideoFrameRecorderHostExtension::capability() const {
 161   return kVideoRecorderCapabilities;
 162 }
 163
 164 scoped_ptr<HostExtensionSession>
 165 VideoFrameRecorderHostExtension::CreateExtensionSession(
 166     ClientSessionControl* client_session_control,
 167     protocol::ClientStub* client_stub) {
 168   return scoped_ptr<HostExtensionSession>(
 169       new VideoFrameRecorderHostExtensionSession(max_content_bytes_));
 170 }
 171
 172 }  // namespace remoting