Allow transitioning to HAVE_METADATA before pipeline initialization completes.

media/base/pipeline.h

Index: media/base/pipeline.h
diff --git a/media/base/pipeline.h b/media/base/pipeline.h
index 91b6c5ea958d7e7154b161e91e723c9dee5d8c0e..84cf55182b92baf75f832d7b63caafd1e794fb73 100644
--- a/media/base/pipeline.h
+++ b/media/base/pipeline.h
@@ -97,6 +97,15 @@ class MEDIA_EXPORT Pipeline
     : public base::RefCountedThreadSafe<Pipeline>,
       public DemuxerHost {
  public:
+
+  // Current buffering state in terms of HTMLMediaElement.readyState values.
+  enum ReadyState {
+    HaveMetadata,

[Ami GONE FROM CHROMIUM, 2012/08/15 18:00:08]

kChromiumStyle

[acolwell GONE FROM CHROMIUM, 2012/08/15 23:21:15]

Done.

+    HaveEnoughData,
+  };
+
+  typedef base::Callback<void(ReadyState)> ReadyStateCB;
+
   // Constructs a media pipeline that will execute on |message_loop|.
   Pipeline(MessageLoop* message_loop, MediaLog* media_log);
 
@@ -113,7 +122,8 @@ class MEDIA_EXPORT Pipeline
   void Start(scoped_ptr<FilterCollection> filter_collection,
              const PipelineStatusCB& ended_cb,
              const PipelineStatusCB& error_cb,
-             const PipelineStatusCB& start_cb);
+             const PipelineStatusCB& start_cb,
+             const ReadyStateCB& ready_state_cb);

[scherkus (not reviewing), 2012/08/15 19:53:43]

docs?

[acolwell GONE FROM CHROMIUM, 2012/08/15 23:21:15]

Done.

 
   // Asynchronously stops the pipeline, executing |stop_cb| when the pipeline
   // teardown has completed.
@@ -295,7 +305,8 @@ class MEDIA_EXPORT Pipeline
   void StartTask(scoped_ptr<FilterCollection> filter_collection,
                  const PipelineStatusCB& ended_cb,
                  const PipelineStatusCB& error_cb,
-                 const PipelineStatusCB& start_cb);
+                 const PipelineStatusCB& start_cb,
+                 const ReadyStateCB& ready_state_cb);
 
   // InitializeTask() performs initialization in multiple passes. It is executed
   // as a result of calling Start() or InitializationComplete() that advances
@@ -493,6 +504,7 @@ class MEDIA_EXPORT Pipeline
   base::Closure stop_cb_;
   PipelineStatusCB ended_cb_;
   PipelineStatusCB error_cb_;
+  ReadyStateCB ready_state_cb_;
 
   // Audio renderer reference used for setting the volume and determining
   // when playback has finished.