Enable <video> in test_shell

This is a work in progress draft.

Summary of changes:
1. Moved code shared by chrome and test_shell to webkie/glue:
   WebMediaPlayerImpl
   SimpleDataSource
   VideoRendererImpl

2. Since WebMediaPlayerImpl is shared, chrome specific renderers
   are enabled by passing the FilterFactoryCollection into
   WebMediaPlayerImpl, this is done in RenderView. And
   WebMediaPlayerImpl provides some default renderer filters, 
   which are used by the test shell and also chrome.


Review URL: http://codereview.chromium.org/119229

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18182 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 229 insertions, 0 deletions

diff --git a/webkit/glue/webmediaplayer_impl.h b/webkit/glue/webmediaplayer_impl.h
new file mode 100644
index 0000000..e670535
--- /dev/null
+++ b/webkit/glue/webmediaplayer_impl.h
@@ -0,0 +1,229 @@
+// Copyright (c) 2008-2009 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.
+//
+// Delegate calls from WebCore::MediaPlayerPrivate to Chrome's video player.
+// It contains PipelineImpl which is the actual media player pipeline, it glues
+// the media player pipeline, data source, audio renderer and renderer.
+// PipelineImpl would creates multiple threads and access some public methods
+// of this class, so we need to be extra careful about concurrent access of
+// methods and members.
+//
+// Properties that are shared by main thread and media threads:
+//   CancelableTaskList tasks_;
+//   ^--- This property is shared for keeping records of the tasks posted to
+//        make sure there will be only one task for each task type that can
+//        exist in the main thread.
+//
+// Methods that are accessed in media threads:
+//   SetAudioRenderer()
+//   ^--- Called during the initialization of the pipeline, essentially from the
+//        the pipeline thread.
+//   SetVideoRenderer()
+//   ^--- Called during the initialization of the pipeline, essentially from the
+//        the pipeline thread.
+//   PostRepaintTask()
+//   ^--- Called from the video renderer thread to notify a video frame has
+//        been prepared.
+//   PostTask()
+//   ^--- A method that helps posting tasks to the main thread, it is
+//        accessed from main thread and media threads, it access the |tasks_|
+//        internally. Needs locking inside to avoid concurrent access to
+//        |tasks_|.
+//
+//
+// Other issues:
+// During tear down of the whole browser or a tab, the DOM tree may not be
+// destructed nicely, and there will be some dangling media threads trying to
+// the main thread, so we need this class to listen to destruction event of the
+// main thread and cleanup the media threads when the even is received. Also
+// at destruction of this class we will need to unhook it from destruction event
+// list of the main thread.
+
+#ifndef WEBKIT_GLUE_WEBMEDIAPLAYER_IMPL_H_
+#define WEBKTI_GLUE_WEBMEDIAPLAYER_IMPL_H_
+
+#include <vector>
+
+#include "base/gfx/platform_canvas.h"
+#include "base/lock.h"
+#include "base/message_loop.h"
+#include "media/base/filters.h"
+#include "media/base/pipeline_impl.h"
+#include "webkit/api/public/WebMediaPlayer.h"
+#include "webkit/api/public/WebMediaPlayerClient.h"
+
+class AudioRendererImpl;
+class DataSourceImpl;
+class GURL;
+class RenderView;
+class VideoRendererImpl;
+
+namespace media {
+class FilterFactoryCollection;
+}
+
+namespace webkit_glue {
+
+// This typedef is used for WebMediaPlayerImpl::PostTask() and
+// NotifyWebMediaPlayerTask in the source file.
+typedef void (WebKit::WebMediaPlayerClient::*WebMediaPlayerClientMethod)();
+
+class WebMediaPlayerImpl : public WebKit::WebMediaPlayer,
+                           public MessageLoop::DestructionObserver {
+ public:
+  // Construct a WebMediaPlayerImpl with reference to the client, and media
+  // filter factory collection. By providing the filter factory collection
+  // the implementor can provide more specific media filters that does resource
+  // loading and rendering. |factory| should contain filter factories for:
+  // 1. Data source
+  // 2. Audio renderer
+  // 3. Video renderer (optional)
+  //
+  // There are some default filters provided by this method:
+  // 1. FFmpeg demuxer
+  // 2. FFmpeg audio decoder
+  // 3. FFmpeg video decoder
+  // 4. Video renderer
+  // 5. Simple data source
+  // 6. Null audio renderer
+  // The video renderer provided by this class is using the graphics context
+  // provided by WebKit to perform renderering. The simple data source does
+  // resource loading by loading the whole resource object into memory. Null
+  // audio renderer is a fake audio device that plays silence. Provider of the
+  // |factory| can override the default filters by adding extra filters to
+  // |factory| before calling this method.
+  WebMediaPlayerImpl(WebKit::WebMediaPlayerClient* client,
+                     media::FilterFactoryCollection* factory);
+  virtual ~WebMediaPlayerImpl();
+
+  virtual void load(const WebKit::WebURL& url);
+  virtual void cancelLoad();
+
+  // Playback controls.
+  virtual void play();
+  virtual void pause();
+  virtual void stop();
+  virtual void seek(float seconds);
+  virtual void setEndTime(float seconds);
+  virtual void setRate(float rate);
+  virtual void setVolume(float volume);
+  virtual void setVisible(bool visible);
+  virtual bool setAutoBuffer(bool autoBuffer);
+  virtual bool totalBytesKnown();
+  virtual float maxTimeBuffered() const;
+  virtual float maxTimeSeekable() const;
+
+  // Methods for painting.
+  virtual void setSize(const WebKit::WebSize& size);
+
+  // TODO(hclam): enable this for mac.
+#if WEBKIT_USING_SKIA
+  virtual void paint(WebKit::WebCanvas* canvas, const WebKit::WebRect& rect);
+#endif
+
+  // True if a video is loaded.
+  virtual bool hasVideo() const;
+
+  // Dimensions of the video.
+  virtual WebKit::WebSize naturalSize() const;
+
+  // Getters of playback state.
+  virtual bool paused() const;
+  virtual bool seeking() const;
+  virtual float duration() const;
+  virtual float currentTime() const;
+
+  // Get rate of loading the resource.
+  virtual int32 dataRate() const;
+
+  // Internal states of loading and network.
+  // TODO(hclam): Ask the pipeline about the state rather than having reading
+  // them from members which would cause race conditions.
+  virtual WebKit::WebMediaPlayer::NetworkState networkState() const {
+    return network_state_;
+  }
+  virtual WebKit::WebMediaPlayer::ReadyState readyState() const {
+    return ready_state_;
+  }
+
+  virtual unsigned long long bytesLoaded() const;
+  virtual unsigned long long totalBytes() const;
+
+  // As we are closing the tab or even the browser, |main_loop_| is destroyed
+  // even before this object gets destructed, so we need to know when
+  // |main_loop_| is being destroyed and we can stop posting repaint task
+  // to it.
+  virtual void WillDestroyCurrentMessageLoop();
+
+  // Notification from |pipeline_| when initialization has finished.
+  void OnPipelineInitialize(bool successful);
+
+  // Notification from |pipeline_| when a seek has finished.
+  void OnPipelineSeek(bool successful);
+
+  // Called from tasks posted to |main_loop_| from this object to remove
+  // reference of them.
+  void DidTask(CancelableTask* task);
+
+  // Public methods to be called from renderers and data source so that
+  // WebMediaPlayerImpl has references to them.
+  void SetVideoRenderer(VideoRendererImpl* video_renderer);
+
+  // Called from VideoRenderer to fire a repaint task to |main_loop_|.
+  void PostRepaintTask();
+
+  // Inline getters.
+  WebKit::WebMediaPlayerClient* client() { return client_; }
+
+ private:
+  // Methods for posting tasks and cancelling tasks. This method may lives in
+  // the main thread or the media threads.
+  void PostTask(int index, WebMediaPlayerClientMethod method);
+
+  // Cancel all tasks currently live in |main_loop_|.
+  void CancelAllTasks();
+
+  // Indexes for tasks.
+  enum {
+    kRepaintTaskIndex = 0,
+    kReadyStateTaskIndex,
+    kNetworkStateTaskIndex,
+    kTimeChangedTaskIndex,
+    kLastTaskIndex
+  };
+
+  // TODO(hclam): get rid of these members and read from the pipeline directly.
+  WebKit::WebMediaPlayer::NetworkState network_state_;
+  WebKit::WebMediaPlayer::ReadyState ready_state_;
+
+  // Message loops for posting tasks between Chrome's main thread. Also used
+  // for DCHECKs so methods calls won't execute in the wrong thread.
+  MessageLoop* main_loop_;
+
+  // A collection of factories for creating filters.
+  scoped_refptr<media::FilterFactoryCollection> filter_factory_;
+
+  // The actual pipeline. We do it a composition here because we expect to have
+  // the same lifetime as the pipeline.
+  media::PipelineImpl pipeline_;
+
+  // We have the interface to VideoRenderer to delegate paint messages to it
+  // from WebKit.
+  scoped_refptr<VideoRendererImpl> video_renderer_;
+
+  WebKit::WebMediaPlayerClient* client_;
+
+  // List of tasks for holding pointers to all tasks currently in the
+  // |main_loop_|. |tasks_| can be access from main thread or the media threads
+  // we need a lock for protecting it.
+  Lock task_lock_;
+  typedef std::vector<CancelableTask*> CancelableTaskList;
+  CancelableTaskList tasks_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
+};
+
+}  // namespace webkit_glue
+
+#endif  // WEBKIT_GLUE_WEBMEDIAPLAYER_IMPL_H_