Refactor MediaResource to be multi-stream capable

media/mojo/services/media_resource_shim.h

 // Copyright 2014 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_MOJO_SERVICES_MEDIA_RESOURCE_SHIM_H_
 #define MEDIA_MOJO_SERVICES_MEDIA_RESOURCE_SHIM_H_
 
 #include <stddef.h>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_resource.h"
 #include "media/mojo/services/mojo_demuxer_stream_adapter.h"
 
 namespace media {
 
 // MediaResource shim for mojom::DemuxerStreams.
 class MediaResourceShim : public MediaResource {
  public:
   // Constructs the shim; at least a single audio or video stream must be
   // provided.  |demuxer_ready_cb| will be called once the streams have been
   // initialized.  Calling any method before then is an error.
   MediaResourceShim(std::vector<mojom::DemuxerStreamPtr> streams,
                     const base::Closure& demuxer_ready_cb);
   ~MediaResourceShim() override;
 
   // MediaResource interface.
-  DemuxerStream* GetStream(DemuxerStream::Type type) override;
+  std::vector<DemuxerStream*> GetStreams() override;
+  void SetStreamStatusChangeCB(const StreamStatusChangeCB& cb) override;
 
  private:
   // Called as each mojom::DemuxerStream becomes ready.  Once all streams
   // are ready it will fire the |demuxer_ready_cb_| provided during
   // construction.
   void OnStreamReady();
 
   // Stored copy the ready callback provided during construction; cleared once
   // all streams are ready.
   base::Closure demuxer_ready_cb_;
 
   // Container for demuxer stream adapters which interface with the mojo level
   // demuxer streams.  |streams_ready_| tracks how many streams are ready and is
   // used by OnStreamReady() to know when |demuxer_ready_cb_| should be fired.
   std::vector<std::unique_ptr<MojoDemuxerStreamAdapter>> streams_;
   size_t streams_ready_;
 
   // WeakPtrFactorys must always be the last member variable.
   base::WeakPtrFactory<MediaResourceShim> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaResourceShim);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MEDIA_RESOURCE_SHIM_H_