Motown: Remove LPCM optimizations, fix prepare, add flush, add ActiveMultistreamSink model/stage

services/media/framework/parts/decoder.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 SERVICES_MEDIA_FRAMEWORK_PARTS_DECODER_H_
 #define SERVICES_MEDIA_FRAMEWORK_PARTS_DECODER_H_
 
-#include "services/media/framework/allocator.h"
-#include "services/media/framework/models/packet_transform.h"
+#include "services/media/framework/models/transform.h"
 #include "services/media/framework/packet.h"
+#include "services/media/framework/payload_allocator.h"
 #include "services/media/framework/result.h"
 #include "services/media/framework/stream_type.h"
 
 namespace mojo {
 namespace media {
 
-class Decoder;
-
-typedef SharedPtr<Decoder, PacketTransform> DecoderPtr;
-
 // Abstract base class for transforms that decode compressed media.
-class Decoder : public PacketTransform {
+class Decoder : public Transform {
  public:
   // Creates a Decoder object for a given stream type.
   static Result Create(
-      const StreamTypePtr& stream_type,
-      DecoderPtr* decoder_out);
+      const std::unique_ptr<StreamType>& stream_type,
+      std::shared_ptr<Decoder>* decoder_out);
 
   ~Decoder() override {}
 
   // Returns the type of the stream the decoder will produce.
-  virtual StreamTypePtr output_stream_type() = 0;
+  virtual std::unique_ptr<StreamType> output_stream_type() = 0;
 
  protected:
   // Initializes the decoder. Called by Decoder::Create.
-  virtual Result Init(const StreamTypePtr& stream_type) = 0;
+  virtual Result Init(const std::unique_ptr<StreamType>& stream_type) = 0;
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif // SERVICES_MEDIA_FRAMEWORK_PARTS_DECODER_H_