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

services/media/framework/stages/active_source_stage.h

Index: services/media/framework/stages/active_source_stage.h
diff --git a/services/media/framework/stages/active_source_stage.h b/services/media/framework/stages/active_source_stage.h
index c89ef25c71bae60c2c634c0d65192da7a70350d9..6c0fd239eef410d49f83e1bcfbf75e8b35547c18 100644
--- a/services/media/framework/stages/active_source_stage.h
+++ b/services/media/framework/stages/active_source_stage.h
@@ -2,8 +2,8 @@
 // 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_ACTIVE_SOURCE_STAGE_H_
-#define SERVICES_MEDIA_FRAMEWORK_ENGINE_ACTIVE_SOURCE_STAGE_H_
+#ifndef SERVICES_MEDIA_FRAMEWORK_STAGES_ACTIVE_SOURCE_STAGE_H_
+#define SERVICES_MEDIA_FRAMEWORK_STAGES_ACTIVE_SOURCE_STAGE_H_
 
 #include <deque>
 
@@ -16,32 +16,45 @@ namespace media {
 // A stage that hosts an ActiveSource.
 class ActiveSourceStage : public Stage {
  public:
-  ActiveSourceStage(ActiveSourcePtr source);
+  ActiveSourceStage(std::shared_ptr<ActiveSource> source);
 
   ~ActiveSourceStage() override;
 
   // Stage implementation.
-  uint32_t input_count() const override;
+  size_t input_count() const override;
 
-  StageInput& input(uint32_t index) override;
+  Input& input(size_t index) override;
 
-  uint32_t output_count() const override;
+  size_t output_count() const override;
 
-  StageOutput& output(uint32_t index) override;
+  Output& output(size_t index) override;
 
-  bool Prepare(UpdateCallback update_callback) override;
+  PayloadAllocator* PrepareInput(size_t index) override;
+
+  void PrepareOutput(
+      size_t index,
+      PayloadAllocator* allocator,
+      const PrepareCallback& callback) override;
+
+  void UnprepareOutput(size_t index) override;
 
   void Update(Engine* engine) override;
 
+  void FlushInput(
+      size_t index,
+      const FlushCallback& callback) override;
+
+  void FlushOutput(size_t index) override;
+
  private:
-  StageOutput output_;
-  ActiveSourcePtr source_;
+  Output output_;
+  std::shared_ptr<ActiveSource> source_;
+  bool prepared_;
   ActiveSource::SupplyCallback supply_function_;
-  Stage::UpdateCallback update_callback_;
   std::deque<PacketPtr> packets_;
 };
 
 }  // namespace media
 }  // namespace mojo
 
-#endif  // SERVICES_MEDIA_FRAMEWORK_ENGINE_ACTIVE_SOURCE_STAGE_H_
+#endif  // SERVICES_MEDIA_FRAMEWORK_STAGES_ACTIVE_SOURCE_STAGE_H_