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

services/media/framework/models/packet_transform.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 MOJO_MEDIA_MODELS_PACKET_TRANSFORM_H_
-#define MOJO_MEDIA_MODELS_PACKET_TRANSFORM_H_
-
-#include <memory>
-
-#include "services/media/framework/allocator.h"
-#include "services/media/framework/packet.h"
-
-namespace mojo {
-namespace media {
-
-// Synchronous packet transform.
-class PacketTransform {
- public:
-  virtual ~PacketTransform() {}
-
-  // Processes a packet. Returns true to indicate the transform is done
-  // processing the input packet. Returns false to indicate the input
-  // packet should be processed again. new_input indicates whether the input
-  // packet is new (true) or is being processed again (false). An output packet
-  // may or may not be generated for any given invocation of this method.
-  virtual bool TransformPacket(
-      const PacketPtr& input,
-      bool new_input,
-      Allocator* allocator,
-      PacketPtr* output) = 0;
-};
-
-typedef std::shared_ptr<PacketTransform> PacketTransformPtr;
-
-}  // namespace media
-}  // namespace mojo
-
-#endif // MOJO_MEDIA_MODELS_PACKET_TRANSFORM_H_