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

services/media/framework/stages/stage_output.h

Index: services/media/framework/stages/stage_output.h
diff --git a/services/media/framework/stages/stage_output.h b/services/media/framework/stages/stage_output.h
deleted file mode 100644
index 8cf72bd7e8329b8dcd214cce0b04e67f80aee261..0000000000000000000000000000000000000000
--- a/services/media/framework/stages/stage_output.h
+++ /dev/null
@@ -1,81 +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_OUTPUT_H_
-#define SERVICES_MEDIA_FRAMEWORK_ENGINE_STAGE_OUTPUT_H_
-
-#include "services/media/framework/allocator.h"
-#include "services/media/framework/packet.h"
-
-namespace mojo {
-namespace media {
-
-class Stage;
-class Engine;
-class StageInput;
-class LpcmStageOutput;
-
-// Represents a stage's connector to an adjacent downstream stage.
-class StageOutput {
- public:
-  StageOutput();
-
-  ~StageOutput();
-
-  // The stage to which this output is connected.
-  Stage* downstream_stage() const { return downstream_stage_; }
-
-  // The index of the input to which this output is connected.
-  uint32_t input_index() const { return input_index_; }
-
-  // Establishes a connection. Called only by the engine.
-  void connect(Stage* downstream_stage, uint32_t input_index);
-
-  // Breaks a connection. Called only by the engine.
-  void disconnect() {
-    downstream_stage_ = nullptr;
-    input_index_ = 0;
-  }
-
-  // Determines whether the output is connected to an input.
-  bool connected() const {
-    return downstream_stage_ != nullptr;
-  }
-
-  // The connected input.
-  StageInput& mate() const;
-
-  // Gets ready to move packets by negotiating the use of allocators. If the
-  // downstream input provides an allocator, and we can use it, this method
-  // returns the provided allocator. Otherwise, it returns nullptr.
-  virtual Allocator* Prepare(bool can_accept_allocator);
-
-  // Demand signalled from downstream, or kNegative if the downstream input
-  // is currently holding a packet.
-  Demand demand() const;
-
-  // Supplies a packet to mate. Called only by Stage::Update implementations.
-  void SupplyPacket(PacketPtr packet, Engine* engine) const;
-
-  // Updates packet demand. Called only by StageInput instances.
-  bool UpdateDemand(Demand demand);
-
-  // Returns the LPCM specialization if this instance is an LpcmStageOutput,
-  // nullptr otherwise.
-  virtual LpcmStageOutput* get_lpcm();
-
- protected:
-  void SupplyPacketInternal(PacketPtr packet, Engine* engine) const;
-
- private:
-  Stage* downstream_stage_;
-  uint32_t input_index_;
-  Demand demand_;
-  Allocator* copy_allocator_;
-};
-
-}  // namespace media
-}  // namespace mojo
-
-#endif  // SERVICES_MEDIA_FRAMEWORK_ENGINE_STAGE_OUTPUT_H_