Motown in-proc streaming framework used to implement media services.

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
new file mode 100644
index 0000000000000000000000000000000000000000..c89ef25c71bae60c2c634c0d65192da7a70350d9
--- /dev/null
+++ b/services/media/framework/stages/active_source_stage.h
@@ -0,0 +1,47 @@
+// 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_ACTIVE_SOURCE_STAGE_H_
+#define SERVICES_MEDIA_FRAMEWORK_ENGINE_ACTIVE_SOURCE_STAGE_H_
+
+#include <deque>
+
+#include "services/media/framework/models/active_source.h"
+#include "services/media/framework/stages/stage.h"
+
+namespace mojo {
+namespace media {
+
+// A stage that hosts an ActiveSource.
+class ActiveSourceStage : public Stage {
+ public:
+  ActiveSourceStage(ActiveSourcePtr source);
+
+  ~ActiveSourceStage() override;
+
+  // Stage implementation.
+  uint32_t input_count() const override;
+
+  StageInput& input(uint32_t index) override;
+
+  uint32_t output_count() const override;
+
+  StageOutput& output(uint32_t index) override;
+
+  bool Prepare(UpdateCallback update_callback) override;

[jeffbrown, 2016/02/02 05:35:48]

Probably want const UpdateCallback&

[dalesat, 2016/02/02 21:46:40]

Will investigate. Added a TODO.

+
+  void Update(Engine* engine) override;
+
+ private:
+  StageOutput output_;
+  ActiveSourcePtr source_;
+  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_