Mojify demuxers and allow running {Chunk/FFmpeg}Demuxer in a Utility Process

media/mojo/services/mojo_demuxer_service_context.h

+// Copyright 2017 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_MOJO_DEMUXER_SERVICE_CONTEXT_H_
+#define MEDIA_MOJO_SERVICES_MOJO_DEMUXER_SERVICE_CONTEXT_H_
+
+#include <map>
+
+#include "base/memory/weak_ptr.h"
+#include "media/base/pipeline.h"
+#include "media/mojo/services/media_mojo_export.h"
+
+namespace media {
+
+class Demuxer;
+class MojoDemuxerService;
+class SourceBuffer;
+
+// A class that creates, owns and manages all MojoDemuxerService instances.
+class MEDIA_MOJO_EXPORT MojoDemuxerServiceContext {
+ public:
+  MojoDemuxerServiceContext();
+  ~MojoDemuxerServiceContext();
+
+  base::WeakPtr<MojoDemuxerServiceContext> GetWeakPtr();
+
+  // Registers The |demuxer_service| with |demuxer_id|.
+  void RegisterDemuxer(int demuxer_id, MojoDemuxerService* demuxer_service);
+
+  // Unregisters the Demuxer. Must be called before the Demuxer is destroyed.
+  void UnregisterDemuxer(int demuxer_id);
+
+  // Returns the Demuxer associated with |demuxer_id|.
+  Demuxer* GetDemuxer(int demuxer_id, const PipelineStatusCB& demuxer_init_cb);
+
+  media::Demuxer* GetDemuxerSourceBuffer(
+      int demuxer_id,
+      media::SourceBuffer** source_buffer_out);
+
+ private:
+  // A map between Demuxer ID and MojoDemuxerService.
+  std::map<int, MojoDemuxerService*> demuxer_services_;
+
+  // NOTE: Weak pointers must be invalidated before all other member variables.
+  base::WeakPtrFactory<MojoDemuxerServiceContext> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoDemuxerServiceContext);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_SERVICE_CONTEXT_H_