Web media player pipeline: implemented feature to choose proper...

media/base/filters.h

 // Copyright (c) 2010 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.
 
 // Filters are connected in a strongly typed manner, with downstream filters
 // always reading data from upstream filters.  Upstream filters have no clue
 // who is actually reading from them, and return the results via callbacks.
 //
 //                         DemuxerStream(Video) <- VideoDecoder <- VideoRenderer
 // DataSource <- Demuxer <
@@ skipping 32 matching lines @@
 class Filter;
 class FilterHost;
 
 // Used for completing asynchronous methods.
 typedef Callback0::Type FilterCallback;
 
 class Filter : public base::RefCountedThreadSafe<Filter> {
  public:
   Filter();
 
+  virtual bool supports_codec_id(int codec_id) { return false; }
+  virtual const char* filter_name() { return "UnknownMediaFilter"; }
+
   // Return the major mime type for this filter.
   virtual const char* major_mime_type() const;
 
   // Sets the private member |host_|. This is the first method called by
   // the FilterHost after a filter is created.  The host holds a strong
   // reference to the filter.  The reference held by the host is guaranteed
   // to be released before the host object is destroyed by the pipeline.
   virtual void set_host(FilterHost* host);
 
   virtual FilterHost* host();
@@ skipping 255 matching lines @@
   // buffer.
   virtual bool HasEnded() = 0;
 
   // Sets the output volume.
   virtual void SetVolume(float volume) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTERS_H_