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

services/media/framework/stages/stage_input.h

Index: services/media/framework/stages/stage_input.h
diff --git a/services/media/framework/stages/stage_input.h b/services/media/framework/stages/stage_input.h
deleted file mode 100644
index 2fe61c64888a2ed28951b19096b91d410a5c08a1..0000000000000000000000000000000000000000
--- a/services/media/framework/stages/stage_input.h
+++ /dev/null
@@ -1,83 +0,0 @@
-// 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_ENGINE_STAGE_INPUT_H_
-#define SERVICES_MEDIA_FRAMEWORK_ENGINE_STAGE_INPUT_H_
-
-#include "services/media/framework/models/demand.h"
-#include "services/media/framework/packet.h"
-
-namespace mojo {
-namespace media {
-
-class Stage;
-class Engine;
-class StageOutput;
-class LpcmStageInput;
-
-// Represents a stage's connector to an adjacent upstream stage.
-class StageInput {
- public:
-  StageInput();
-
-  ~StageInput();
-
-  // The stage to which this input is connected.
-  Stage* upstream_stage() const { return upstream_stage_; }
-
-  // The index of the output to which this input is connected.
-  uint32_t output_index() const { return output_index_; }
-
-  // Establishes a connection. Called only by the engine.
-  void connect(Stage* upstream_stage, uint32_t output_index);
-
-  // Breaks a connection. Called only by the engine.
-  void disconnect() {
-    upstream_stage_ = nullptr;
-    output_index_ = 0;
-  }
-
-  // Determines whether the input is connected to an output.
-  bool connected() const { return upstream_stage_ != nullptr; }
-
-  // The connected output.
-  StageOutput& mate() const;
-
-  // Prepare to move packets by providing an allocator for the upstream stage
-  // if we have one and indicating whether we require its use.
-  void Prepare(Allocator* allocator, bool must_allocate);
-
-  // Returns the allocator provided by this input.
-  Allocator* allocator() const;
-
-  // Determines whether the input requires the use of its allocator.
-  bool must_allocate() const;
-
-  // A packet supplied from upstream.
-  PacketPtr& packet_from_upstream() { return packet_from_upstream_; }
-
-  // Updates mate's demand. Called only by Stage::Update implementations.
-  void SetDemand(Demand demand, Engine* engine) const;
-
-  // Updates packet_from_upstream. Return value indicates whether the stage for
-  // this input should be added to the supply backlog. Called only by
-  // StageOutput instances.
-  virtual bool SupplyPacketFromOutput(PacketPtr packet);
-
-  // Returns the LPCM specialization if this instance is an LpcmStageInput,
-  // nullptr otherwise.
-  virtual LpcmStageInput* get_lpcm();
-
- private:
-  Stage* upstream_stage_;
-  uint32_t output_index_;
-  Allocator* allocator_;
-  bool must_allocate_;
-  PacketPtr packet_from_upstream_;
-};
-
-}  // namespace media
-}  // namespace mojo
-
-#endif  // SERVICES_MEDIA_FRAMEWORK_ENGINE_STAGE_INPUT_H_