Adding support for MediaStream and PeerConnection functionality

content/renderer/media/peer_connection_handler.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/renderer/media/peer_connection_handler.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/utf_string_conversions.h"
+#include "content/renderer/media/media_stream_dependency_factory.h"
+#include "content/renderer/media/media_stream_impl.h"
+#include "third_party/libjingle/source/talk/base/thread.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaStreamDescriptor.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaStreamSource.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPeerConnectionHandlerClient.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebVector.h"
+
+PeerConnectionHandler::PeerConnectionHandler(
+    WebKit::WebPeerConnectionHandlerClient* client,
+    MediaStreamImpl* msi,
+    MediaStreamDependencyFactory* dependency_factory,
+    talk_base::Thread* signaling_thread)
+    : client_(client),
+      msi_(msi),
+      dependency_factory_(dependency_factory),
+      message_loop_proxy_(base::MessageLoopProxy::current()),
+      signaling_thread_(signaling_thread),
+      call_state_(NOT_STARTED) {
+}
+
+PeerConnectionHandler::~PeerConnectionHandler() {
+  if (native_peer_connection_.get()) {
+    native_peer_connection_->RegisterObserver(NULL);
+    native_peer_connection_->Close();
+  }
+  dependency_factory_->DeletePeerConnectionFactory();
+}
+
+void PeerConnectionHandler::initialize(
+    const WebKit::WebString& serverConfiguration,
+    const WebKit::WebSecurityOrigin&) {
+  native_peer_connection_.reset(dependency_factory_->CreatePeerConnection(
+      signaling_thread_));
+}
+
+void PeerConnectionHandler::produceInitialOffer(
+    const WebKit::WebVector<WebKit::WebMediaStreamDescriptor>&
+        pendingAddStreams) {
+  // We currently don't support creating an initial offer without a stream.
+  // Native PeerConnection will anyway create the initial offer when the first
+  // (and only) stream is added, so it will be done when processPendingStreams
+  // is called if not here.
+  if (pendingAddStreams.isEmpty()) {
+    DVLOG(1) << "Can't produce initial offer with no stream.";
+    return;
+  }
+  // TODO(grunell): Support several streams.
+  DCHECK_EQ(pendingAddStreams.size(), static_cast<size_t>(1));
+  AddStream(UTF16ToUTF8(pendingAddStreams[0].label()));
+}
+
+void PeerConnectionHandler::handleInitialOffer(const WebKit::WebString& sdp) {
+  native_peer_connection_->SignalingMessage(UTF16ToUTF8(sdp));
+}
+
+void PeerConnectionHandler::processSDP(const WebKit::WebString& sdp) {
+  native_peer_connection_->SignalingMessage(UTF16ToUTF8(sdp));
+}
+
+void PeerConnectionHandler::processPendingStreams(
+    const WebKit::WebVector<WebKit::WebMediaStreamDescriptor>&
+        pendingAddStreams,
+    const WebKit::WebVector<WebKit::WebMediaStreamDescriptor>&
+        pendingRemoveStreams) {
+  // TODO(grunell): Support several streams.
+  if (!pendingAddStreams.isEmpty()) {
+    DCHECK_EQ(pendingAddStreams.size(), static_cast<size_t>(1));
+    AddStream(UTF16ToUTF8(pendingAddStreams[0].label()));
+  }
+  // Currently we ignore remove stream, no support in native PeerConnection.
+}
+
+void PeerConnectionHandler::sendDataStreamMessage(const char* data,
+                                                  size_t length) {
+  // TODO(grunell): Implement. Not supported in native PeerConnection.
+  NOTIMPLEMENTED();
+}
+
+void PeerConnectionHandler::stop() {
+  if (native_peer_connection_.get())
+    native_peer_connection_->RegisterObserver(NULL);
+  native_peer_connection_.reset();
+  // The close function will delete us.
+  msi_->ClosePeerConnection();
+}
+
+// TODO(grunell): Check usage of
+// WebPeerConnectionHandlerClient::didCompleteICEProcessing. Do we need to call
+// it?
+
+void PeerConnectionHandler::OnSignalingMessage(const std::string& msg) {
+  if (!message_loop_proxy_->BelongsToCurrentThread()) {
+    message_loop_proxy_->PostTask(FROM_HERE, base::Bind(
+        &PeerConnectionHandler::OnSignalingMessage,
+        base::Unretained(this),
+        msg));
+    return;
+  }
+  client_->didGenerateSDP(UTF8ToUTF16(msg));
+}
+
+void PeerConnectionHandler::OnAddStream(const std::string& stream_id,
+                                        bool video) {
+  if (!video)
+    return;
+
+  if (!message_loop_proxy_->BelongsToCurrentThread()) {
+    message_loop_proxy_->PostTask(FROM_HERE, base::Bind(
+        &PeerConnectionHandler::OnAddStreamCallback,
+        base::Unretained(this),
+        stream_id));
+  } else {
+    OnAddStreamCallback(stream_id);
+  }
+}
+
+void PeerConnectionHandler::OnRemoveStream(
+    const std::string& stream_id,
+    bool video) {
+  if (!video)
+    return;
+
+  if (!message_loop_proxy_->BelongsToCurrentThread()) {
+    message_loop_proxy_->PostTask(FROM_HERE, base::Bind(
+        &PeerConnectionHandler::OnRemoveStreamCallback,
+        base::Unretained(this),
+        remote_label_));
+  } else {
+    OnRemoveStreamCallback(remote_label_);
+  }
+}
+
+void PeerConnectionHandler::AddStream(const std::string label) {
+  // TODO(grunell): Fix code in this function after a new native PeerConnection
+  // version has been rolled out.
+  if (call_state_ == NOT_STARTED) {
+    // TODO(grunell): Add audio and/or video depending on what's enabled
+    // in the stream.
+    std::string audio_label = label;
+    audio_label.append("-audio");
+    native_peer_connection_->AddStream(audio_label, false);  // Audio
+    native_peer_connection_->AddStream(label, true);  // Video
+    call_state_ = INITIATING;
+  }
+  if (call_state_ == INITIATING || call_state_ == RECEIVING) {
+    local_label_ = label;
+    if (msi_->SetVideoCaptureModule(label))
+      native_peer_connection_->SetVideoCapture("");
+    if (call_state_ == INITIATING)
+      native_peer_connection_->Connect();
+    else if (call_state_ == RECEIVING)
+      call_state_ = SENDING_AND_RECEIVING;
+  } else {
+    DLOG(ERROR) << "Multiple streams not supported";
+  }
+}
+
+void PeerConnectionHandler::OnAddStreamCallback(
+    const std::string& stream_label) {
+  // TODO(grunell): Fix code in this function after a new native PeerConnection
+  // version has been rolled out.
+  if (call_state_ == NOT_STARTED) {
+    remote_label_ = stream_label;
+    call_state_ = RECEIVING;
+  } else if (call_state_ == INITIATING) {
+    remote_label_ = local_label_;
+    remote_label_ += "-remote";
+    call_state_ = SENDING_AND_RECEIVING;
+  }
+
+  // TODO(grunell): Support several tracks.
+  // TODO(grunell): One for audio and one for video?
+  WebKit::WebVector<WebKit::WebMediaStreamSource>
+      source_vector(static_cast<size_t>(1));
+  source_vector[0].initialize(WebKit::WebString::fromUTF8(""),
+                              WebKit::WebMediaStreamSource::TypeVideo,
+                              WebKit::WebString::fromUTF8(remote_label_));
+  WebKit::WebMediaStreamDescriptor descriptor;
+  descriptor.initialize(UTF8ToUTF16(remote_label_), source_vector);
+  client_->didAddRemoteStream(descriptor);
+}
+
+void PeerConnectionHandler::OnRemoveStreamCallback(
+    const std::string& stream_label) {
+  // TODO(grunell): Support several tracks.
+  // TODO(grunell): One for audio and one for video?
+  WebKit::WebVector<WebKit::WebMediaStreamSource> source_vector(
+      static_cast<size_t>(1));
+  source_vector[0].initialize(WebKit::WebString::fromUTF8(""),
+                              WebKit::WebMediaStreamSource::TypeVideo,
+                              WebKit::WebString::fromUTF8(stream_label));
+  WebKit::WebMediaStreamDescriptor descriptor;
+  descriptor.initialize(UTF8ToUTF16(stream_label), source_vector);
+  client_->didRemoveRemoteStream(descriptor);
+}