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

services/media/framework/stages/packet_transform_stage.cc

Index: services/media/framework/stages/packet_transform_stage.cc
diff --git a/services/media/framework/stages/packet_transform_stage.cc b/services/media/framework/stages/packet_transform_stage.cc
deleted file mode 100644
index 2564f123f23933dbe2c790bd954cb2ce0b144c4e..0000000000000000000000000000000000000000
--- a/services/media/framework/stages/packet_transform_stage.cc
+++ /dev/null
@@ -1,73 +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/packet_transform_stage.h"
-
-namespace mojo {
-namespace media {
-
-PacketTransformStage::PacketTransformStage(
-    PacketTransformPtr transform) :
-    transform_(transform),
-    allocator_(nullptr),
-    input_packet_is_new_(true) {
-  DCHECK(transform_);
-}
-
-PacketTransformStage::~PacketTransformStage() {}
-
-uint32_t PacketTransformStage::input_count() const {
-  return 1;
-};
-
-StageInput& PacketTransformStage::input(uint32_t index) {
-  DCHECK_EQ(index, 0u);
-  return input_;
-}
-
-uint32_t PacketTransformStage::output_count() const {
-  return 1;
-}
-
-StageOutput& PacketTransformStage::output(uint32_t index) {
-  DCHECK_EQ(index, 0u);
-  return output_;
-}
-
-bool PacketTransformStage::Prepare(const UpdateCallback update_callback) {
-  allocator_ = output_.Prepare(true);
-  if (allocator_ == nullptr) {
-    allocator_ = Allocator::GetDefault();
-  }
-  input_.Prepare(nullptr, false);
-  return false;
-}
-
-void PacketTransformStage::Update(Engine* engine) {
-  DCHECK(engine);
-  DCHECK(allocator_);
-
-  if (input_.packet_from_upstream() && output_.demand() != Demand::kNegative) {
-    PacketPtr output_packet;
-    if (transform_->TransformPacket(
-        input_.packet_from_upstream(),
-        input_packet_is_new_,
-        allocator_,
-        &output_packet)) {
-      input_.packet_from_upstream().reset();
-      input_packet_is_new_ = true;
-    } else {
-      input_packet_is_new_ = false;
-    }
-
-    if (output_packet) {
-      output_.SupplyPacket(std::move(output_packet), engine);
-    }
-  }
-
-  input_.SetDemand(output_.demand(), engine);
-}
-
-}  // namespace media
-}  // namespace mojo