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

services/media/framework/stages/transform_stage.h

Index: services/media/framework/stages/transform_stage.h
diff --git a/services/media/framework/stages/transform_stage.h b/services/media/framework/stages/transform_stage.h
new file mode 100644
index 0000000000000000000000000000000000000000..07cec4abde036a9b0cf99660c04e7c916503c489
--- /dev/null
+++ b/services/media/framework/stages/transform_stage.h
@@ -0,0 +1,60 @@
+// 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_STAGES_TRANSFORM_STAGE_H_
+#define SERVICES_MEDIA_FRAMEWORK_STAGES_TRANSFORM_STAGE_H_
+
+#include "services/media/framework/models/transform.h"
+#include "services/media/framework/stages/stage.h"
+
+namespace mojo {
+namespace media {
+
+// A stage that hosts a Transform.
+class TransformStage : public Stage {
+ public:
+  TransformStage(std::shared_ptr<Transform> transform);
+
+  ~TransformStage() override;
+
+  // Stage implementation.
+  size_t input_count() const override;
+
+  Input& input(size_t index) override;
+
+  size_t output_count() const override;
+
+  Output& output(size_t index) override;
+
+  PayloadAllocator* PrepareInput(size_t index) override;
+
+  void PrepareOutput(
+      size_t index,
+      PayloadAllocator* allocator,
+      const UpstreamCallback& callback) override;
+
+  void UnprepareOutput(
+      size_t index,
+      const UpstreamCallback& callback) override;
+
+  void Update(Engine* engine) override;
+
+  void FlushInput(
+      size_t index,
+      const DownstreamCallback& callback) override;
+
+  void FlushOutput(size_t index) override;
+
+ private:
+  Input input_;
+  Output output_;
+  std::shared_ptr<Transform> transform_;
+  PayloadAllocator* allocator_;
+  bool input_packet_is_new_;
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif  // SERVICES_MEDIA_FRAMEWORK_STAGES_TRANSFORM_STAGE_H_