Notify HTMLMediaElement when media pipeline init has finished

media/filters/pipeline_controller.h

 // Copyright 2016 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_FILTERS_PIPELINE_CONTROLLER_H_
 #define MEDIA_FILTERS_PIPELINE_CONTROLLER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 28 matching lines @@
   };
 
   using RendererFactoryCB = base::Callback<std::unique_ptr<Renderer>(void)>;
   using SeekedCB = base::Callback<void(bool time_updated)>;
   using SuspendedCB = base::Callback<void()>;
 
   // Construct a PipelineController wrapping |pipeline_|. |pipeline_| must
   // outlive the resulting PipelineController. The callbacks are:
   //   - |renderer_factory_cb| is called by PipelineController to create new
   //     renderers when starting and resuming.
+  //   - |start_done_cb| is called when the pipeline has finished the async
+  //     start operation either successfully or unsuccessfully.
   //   - |seeked_cb| is called upon reaching a stable state if a seek occured.
   //   - |suspended_cb| is called immediately after suspendeding.
   //   - |error_cb| is called if any operation on |pipeline_| does not result
   //     in PIPELINE_OK or its error callback is called.
   PipelineController(Pipeline* pipeline,
                      const RendererFactoryCB& renderer_factory_cb,
+                     const PipelineStatusCB& start_done_cb,
                      const SeekedCB& seeked_cb,
                      const SuspendedCB& suspended_cb,
                      const PipelineStatusCB& error_cb);
   ~PipelineController();
 
   // Start |pipeline_|. |demuxer| will be retained and StartWaitingForSeek()/
   // CancelPendingSeek() will be issued to it as necessary.
   //
   // When |is_streaming| is true, Resume() will always start at the
   // beginning of the stream, rather than attempting to seek to the current
@@ skipping 43 matching lines @@
 
   // PipelineStaus callback that also carries the target state.
   void OnPipelineStatus(State state, PipelineStatus pipeline_status);
 
   // The Pipeline we are managing state for.
   Pipeline* pipeline_ = nullptr;
 
   // Factory for Renderers, used for Start() and Resume().
   RendererFactoryCB renderer_factory_cb_;
 
+  // Called when Pipeline::Start is completed.
+  PipelineStatusCB start_done_cb_;
+
   // Called after seeks (which includes Start()) upon reaching a stable state.
   // Multiple seeks result in only one callback if no stable state occurs
   // between them.
   SeekedCB seeked_cb_;
 
   // Called immediately when |pipeline_| completes a suspend operation.
   SuspendedCB suspended_cb_;
 
   // Called immediately when any operation on |pipeline_| results in an error.
   PipelineStatusCB error_cb_;
@@ skipping 32 matching lines @@
 
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<PipelineController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PipelineController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_PIPELINE_CONTROLLER_H_