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

services/media/framework/stages/lpcm_stage_input.h

Index: services/media/framework/stages/lpcm_stage_input.h
diff --git a/services/media/framework/stages/lpcm_stage_input.h b/services/media/framework/stages/lpcm_stage_input.h
deleted file mode 100644
index b5ce1548d13bc1dd52f7f8b06b9420a1705c4525..0000000000000000000000000000000000000000
--- a/services/media/framework/stages/lpcm_stage_input.h
+++ /dev/null
@@ -1,102 +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_LPCM_STAGE_INPUT_H_
-#define SERVICES_MEDIA_FRAMEWORK_ENGINE_LPCM_STAGE_INPUT_H_
-
-#include <vector>
-
-#include "services/media/framework/lpcm_util.h"
-#include "services/media/framework/models/demand.h"
-#include "services/media/framework/models/lpcm_frame_buffer.h"
-#include "services/media/framework/stages/stage_input.h"
-
-namespace mojo {
-namespace media {
-
-class LpcmStageOutput;
-
-// Represents a stage's connector to an adjacent upstream stage, with LPCM
-// optmizations.
-class LpcmStageInput : public StageInput {
- public:
-  LpcmStageInput();
-
-  ~LpcmStageInput();
-
-  // Sets the stream type.
-  void set_stream_type(const LpcmStreamType& stream_type);
-
-  // Suggests possible demand frame count, useful when !connected_to_lpcm().
-  void SuggestDemand(uint64_t frame_count, Engine* engine);
-
-  // Updates the demand signalled to the connected upstream output.
-  void SetLpcmDemand(
-      void* buffer,
-      uint64_t frame_count,
-      bool mix,
-      bool synchronous,
-      Engine* engine);
-
-  // Indicates whether demand is pending.
-  bool demand_pending() const {
-    return demand_pending_;
-  }
-
-  // Returns supplied frames.
-  LpcmFrameBuffer& lpcm_supply() {
-    return lpcm_supply_;
-  }
-
-  // Indicates whether we've hit end-of-stream.
-  bool end_of_stream() const {
-    return end_of_stream_;
-  }
-
-  // Indicates the frame count originally demanded.
-  uint64_t demand_frame_count() const {
-    return frame_count_;
-  }
-
-  // StageInput overrides.
-  bool SupplyPacketFromOutput(PacketPtr packet) override;
-
-  LpcmStageInput* get_lpcm() override;
-
- private:
-  static const uint64_t kDefaultFrameCount = 512;
-
-  bool connected_to_lpcm();
-
-  // Copies or mixes frames from packet_frames_ to demand_frames_. This is only
-  // used when !connected_to_lpcm() and the stage has supplied a buffer. The
-  // return value indicates whether the demand was met.
-  bool CopyOrMixFrames();
-
-  // Ensures demand_buffer_ can accommodate frame_count frames and returns it.
-  void* GetDemandBuffer(uint64_t frame_count);
-
-  bool demand_pending_;
-
-  void* buffer_;
-  uint64_t frame_count_;
-  bool mix_;
-  bool synchronous_;
-
-  LpcmFrameBuffer lpcm_supply_; // Frames supplied to this stage.
-  LpcmFrameBuffer packet_frames_; // Source for packet payload copy/mix.
-  LpcmFrameBuffer demand_frames_; // Destination for packet payload copy/mix.
-
-  bool end_of_stream_;
-
-  std::unique_ptr<LpcmUtil> lpcm_util_;
-  std::vector<uint8_t> demand_buffer_;
-
-  LpcmFrameBuffer::ExhaustedCallback packet_exhausted_function_;
-};
-
-}  // namespace media
-}  // namespace mojo
-
-#endif  // SERVICES_MEDIA_FRAMEWORK_ENGINE_LPCM_STAGE_INPUT_H_