Connect webrtc MediaSourceInterface ready states with webkit WebMediaStreamSource

content/renderer/media/media_stream_source_observer.cc

Index: content/renderer/media/media_stream_source_observer.cc
diff --git a/content/renderer/media/media_stream_source_observer.cc b/content/renderer/media/media_stream_source_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a62c997525c06d603349fdc5ee5e2ba9add7e8e9
--- /dev/null
+++ b/content/renderer/media/media_stream_source_observer.cc
@@ -0,0 +1,63 @@
+// Copyright (c) 2013 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/media_stream_source_observer.h"
+
+#include "base/logging.h"
+#include "content/renderer/media/media_stream_source_extra_data.h"
+
+namespace content {
+
+MediaStreamSourceObserver::MediaStreamSourceObserver(
+    webrtc::MediaSourceInterface* webrtc_source,
+    MediaStreamSourceExtraData* extra_data)
+     : state_(webrtc_source->state()),
+       webrtc_source_(webrtc_source),
+       extra_data_(extra_data) {
+  webrtc_source_->RegisterObserver(this);
+}
+
+MediaStreamSourceObserver::~MediaStreamSourceObserver() {
+  DCHECK(CalledOnValidThread());
+  if (webrtc_source_)
+    webrtc_source_->UnregisterObserver(this);
+}
+
+void MediaStreamSourceObserver::OnChanged() {
+  DCHECK(CalledOnValidThread());
+  // There should be no more notification after kEnded.
+  DCHECK(webrtc_source_ != NULL);
+
+  webrtc::MediaSourceInterface::SourceState state = webrtc_source_->state();
+  if (state == state_)
+    return;
+  state_ = state;
+  WebKit::WebMediaStreamSource webkit_source(extra_data_->webkit_source());
+
+  switch (state) {
+    case webrtc::MediaSourceInterface::kInitializing:
+      // Ignore the kInitializing state since there is no match in
+      // WebMediaStreamSource::ReadyState.
+      break;
+    case webrtc::MediaSourceInterface::kLive:
+      webkit_source.setReadyState(
+          WebKit::WebMediaStreamSource::ReadyStateLive);
+      break;
+    case webrtc::MediaSourceInterface::kMuted:
+      webkit_source.setReadyState(
+          WebKit::WebMediaStreamSource::ReadyStateMuted);
+      break;
+    case webrtc::MediaSourceInterface::kEnded:
+      webkit_source.setReadyState(
+          WebKit::WebMediaStreamSource::ReadyStateEnded);
+      webrtc_source_->UnregisterObserver(this);
+      webrtc_source_ = NULL;
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+}
+
+}  // namespace content