Plumb media data from renderers up to MediaInternals in the browser process.

BUG=none
TEST=manually


Review URL: http://codereview.chromium.org/7480032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@95542 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 149 insertions, 0 deletions

diff --git a/media/base/media_log.cc b/media/base/media_log.cc
new file mode 100644
index 0000000..6bcbcd71
--- /dev/null
+++ b/media/base/media_log.cc
@@ -0,0 +1,60 @@
+// 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 "media/base/media_log.h"
+
+#include "base/atomic_sequence_num.h"
+#include "base/logging.h"
+
+namespace media {
+
+// A count of all MediaLogs created on this render process.
+// Used to generate unique ids.
+static base::AtomicSequenceNumber media_log_count(base::LINKER_INITIALIZED);
+
+const char* MediaLog::EventTypeToString(MediaLogEvent::Type type) {
+  switch (type) {
+    case MediaLogEvent::CREATING:
+      return "CREATING";
+    case MediaLogEvent::DESTROYING:
+      return "DESTROYING";
+    case MediaLogEvent::LOAD:
+      return "LOAD";
+    case MediaLogEvent::PLAY:
+      return "PLAY";
+    case MediaLogEvent::PAUSE:
+      return "PAUSE";
+  }
+  NOTREACHED();
+  return NULL;
+}
+
+MediaLog::MediaLog() {
+  id_ = media_log_count.GetNext();
+}
+
+MediaLog::~MediaLog() {}
+
+void MediaLog::Load(const std::string& url) {
+  MediaLogEvent* event = CreateEvent(MediaLogEvent::LOAD);
+  event->params.SetString("url", url);
+  AddEvent(event);
+}
+
+void MediaLog::AddEventOfType(MediaLogEvent::Type type) {
+  MediaLogEvent* event = CreateEvent(type);
+  AddEvent(event);
+}
+
+MediaLogEvent* MediaLog::CreateEvent(MediaLogEvent::Type type) {
+  MediaLogEvent* event = new MediaLogEvent;
+  event->id = id_;
+  event->type = type;
+  event->time = base::Time::Now();
+  return event;
+}
+
+void MediaLog::AddEvent(MediaLogEvent* event) {}
+
+}  //namespace media
diff --git a/media/base/media_log.h b/media/base/media_log.h
new file mode 100644
index 0000000..fcf0c31
--- /dev/null
+++ b/media/base/media_log.h
@@ -0,0 +1,50 @@
+// 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.
+
+#ifndef MEDIA_BASE_MEDIA_LOG_H_
+#define MEDIA_BASE_MEDIA_LOG_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"
+#include "media/base/media_log_event.h"
+
+namespace media {
+
+class MediaLog : public base::RefCountedThreadSafe<MediaLog> {
+ public:
+
+  // Return a string to represent an EventType.
+  static const char* EventTypeToString(MediaLogEvent::Type type);
+
+  MediaLog();
+
+  // Methods called by loggers when events occur. These generate appropriate
+  // event parameters so the caller need not worry about them.
+  void Load(const std::string& url);
+
+  // Add an event to this log. Overriden by inheritors to actually do something
+  // with it.
+  // Takes ownership of |event|.
+  virtual void AddEvent(MediaLogEvent* event);
+
+  // Convenience method for adding an event with no parameters.
+  void AddEventOfType(MediaLogEvent::Type type);
+
+  // Convenience method for filling in common fields of a new event.
+  MediaLogEvent* CreateEvent(MediaLogEvent::Type type);
+
+ protected:
+  friend class base::RefCountedThreadSafe<MediaLog>;
+  virtual ~MediaLog();
+
+ private:
+  // A unique (to this process) id for this MediaLog.
+  int32 id_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaLog);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIA_LOG_H_
diff --git a/media/base/media_log_event.h b/media/base/media_log_event.h
new file mode 100644
index 0000000..dd1735e
--- /dev/null
+++ b/media/base/media_log_event.h
@@ -0,0 +1,39 @@
+// 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.
+
+#ifndef MEDIA_BASE_MEDIA_LOG_EVENT_H_
+#define MEDIA_BASE_MEDIA_LOG_EVENT_H_
+#pragma once
+
+#include "base/time.h"
+#include "base/values.h"
+
+namespace media {
+
+struct MediaLogEvent {
+  enum Type {
+    // A media player is being created or destroyed.
+    // params: none.
+    CREATING,
+    DESTROYING,
+
+    // A media player is loading a resource.
+    // params: "url": <URL of the resource>.
+    LOAD,
+
+    // A media player has been told to play or pause.
+    // params: none.
+    PLAY,
+    PAUSE,
+  };
+
+  int32 id;
+  Type type;
+  base::DictionaryValue params;
+  base::Time time;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_MEDIA_LOG_EVENT_H_