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

services/media/framework/stages/lpcm_transform_stage.cc

Index: services/media/framework/stages/lpcm_transform_stage.cc
diff --git a/services/media/framework/stages/lpcm_transform_stage.cc b/services/media/framework/stages/lpcm_transform_stage.cc
deleted file mode 100644
index 3f42e01537cf194d7b7d3cd555ae95d511c07bc2..0000000000000000000000000000000000000000
--- a/services/media/framework/stages/lpcm_transform_stage.cc
+++ /dev/null
@@ -1,68 +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.
-
-#include "services/media/framework/stages/lpcm_transform_stage.h"
-
-namespace mojo {
-namespace media {
-
-LpcmTransformStage::LpcmTransformStage(LpcmTransformPtr transform) :
-    transform_(transform) {
-  DCHECK(transform_);
-  input_.set_stream_type(transform_->input_stream_type());
-  output_.set_stream_type(transform_->output_stream_type());
-}
-
-LpcmTransformStage::~LpcmTransformStage() {}
-
-uint32_t LpcmTransformStage::input_count() const {
-  return 1;
-};
-
-StageInput& LpcmTransformStage::input(uint32_t index) {
-  DCHECK_EQ(index, 0u);
-  return input_;
-}
-
-uint32_t LpcmTransformStage::output_count() const {
-  return 1;
-}
-
-StageOutput& LpcmTransformStage::output(uint32_t index) {
-  DCHECK_EQ(index, 0u);
-  return output_;
-}
-
-bool LpcmTransformStage::Prepare(UpdateCallback update_callback) {
-  output_.Prepare(false);
-  input_.Prepare(nullptr, false);
-  return false;
-}
-
-void LpcmTransformStage::Update(Engine* engine) {
-  DCHECK(engine);
-
-  LpcmFrameBuffer& supply = input_.lpcm_supply();
-
-  if (supply.frame_count() != 0 || input_.end_of_stream()) {
-    // TODO(dalesat): Assumes 1-1.
-    LpcmFrameBuffer& demand = output_.lpcm_demand(supply.frame_count());
-
-    if (demand.frame_count() != 0) {
-      if (supply.frame_count() != 0) {
-        transform_->TransformFrames(&supply, &demand, output_.mix());
-      }
-
-      if (demand.frame_count() == 0 || input_.end_of_stream()) {
-        output_.SupplyFrames(input_.end_of_stream(), engine);
-      }
-    }
-  }
-
-  // TODO(dalesat): Assumes 1-1.
-  input_.SuggestDemand(output_.demand_suggestion(), engine);
-}
-
-}  // namespace media
-}  // namespace mojo