Pipeline_Impl was modified to properly render a stream that has video but no ...

media/base/pipeline.h

 // Copyright (c) 2006-2009 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.
 
 // The pipeline is the public API clients use for playing back media.  Clients
 // provide a filter factory containing the filters they want the pipeline to
 // use to render media.
 
 #ifndef MEDIA_BASE_PIPELINE_H_
 #define MEDIA_BASE_PIPELINE_H_
 
 #include <string>
 
 #include "base/task.h"
 #include "base/time.h"
 #include "media/base/factory.h"
 
 namespace media {
 
-// Error definitions for pipeline.
+// Error definitions for pipeline.  All codes indicate an error except:
+// PIPELINE_OK indicates the pipeline is running normally.
+// PIPELINE_STOPPING is used internally when Pipeline::Stop() is called.
 enum PipelineError {
   PIPELINE_OK,
+  PIPELINE_STOPPING,
+  PIPELINE_ERROR_URL_NOT_FOUND,
   PIPELINE_ERROR_NETWORK,
   PIPELINE_ERROR_DECODE,
   PIPELINE_ERROR_ABORT,
   PIPELINE_ERROR_INITIALIZATION_FAILED,
-  PIPELINE_STOPPING
+  PIPELINE_ERROR_REQUIRED_FILTER_MISSING,
+  PIPELINE_ERROR_OUT_OF_MEMORY,
+  PIPELINE_ERROR_COULD_NOT_RENDER,
+  PIPELINE_ERROR_READ
 };
 
 // Base class for Pipeline class which allows for read-only access to members.
 // Filters are allowed to access the PipelineStatus interface but are not given
 // access to the client Pipeline methods.
 class PipelineStatus {
  public:
   // Returns the current initialization state of the pipeline.  Clients can
   // examine this to determine if it is acceptable to call SetRate/SetVolume/
   // Seek after calling Start on the pipeline.  Note that this will be
@@ skipping 45 matching lines @@
   // progresses from 0 to the end of the media. Becuase this method provides
   // an estimated time, it is possible that subsequent calls to this method will
   // actually progress backwards slightly, so callers must not assume that this
   // method will always return times larger than the last one.
   virtual base::TimeDelta GetInterpolatedTime() const = 0;
 
   // Gets the current error status for the pipeline.  If the pipeline is
   // operating correctly, this will return OK.
   virtual PipelineError GetError() const = 0;
 
+  // If the |major_mime_type| exists in the pipeline and is being rendered, this
+  // method will return true.  Types are defined in media/base/media_foramt.h.
+  // For example, to determine if a pipeline contains video:
+  //   bool has_video = pipeline->IsRendered(mime_type::kMajorTypeVideo);
+  virtual bool IsRendered(const std::string& major_mime_type) const = 0;
+
  protected:
   virtual ~PipelineStatus() {}
 };
 
 
 class Pipeline : public PipelineStatus {
  public:
   // Build a pipeline to render the given URI using the given filter factory to
   // construct a filter chain.  Returns true if successful, false otherwise
   // (i.e., pipeline already started).  Note that a return value of true
@@ skipping 50 matching lines @@
   // This method must be called only after initialization has completed.
   virtual void SetVolume(float volume) = 0;
 
  protected:
   virtual ~Pipeline() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_H_