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

services/media/framework/models/active_source.h

+// 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 MOJO_MEDIA_MODELS_ACTIVE_SOURCE_H_
+#define MOJO_MEDIA_MODELS_ACTIVE_SOURCE_H_
+
+#include <memory>
+
+#include "services/media/framework/allocator.h"
+#include "services/media/framework/models/demand.h"
+#include "services/media/framework/packet.h"
+
+namespace mojo {
+namespace media {
+
+// Source that produces packets asynchronously.
+class ActiveSource {
+ public:
+  using SupplyCallback = std::function<void(PacketPtr packet)>;
+
+  virtual ~ActiveSource() {}
+
+  // Whether the source can accept an allocator.
+  virtual bool can_accept_allocator() const = 0;
+
+  // Sets the allocator for the source.
+  virtual void set_allocator(Allocator* allocator) = 0;
+
+  // Sets the callback that supplies a packet asynchronously.
+  virtual void SetSupplyCallback(SupplyCallback supply_callback) = 0;
+
+  // Sets the demand signalled from downstream.
+  virtual void SetDownstreamDemand(Demand demand) = 0;
+};
+
+typedef std::shared_ptr<ActiveSource> ActiveSourcePtr;
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // MOJO_MEDIA_MODELS_ACTIVE_SOURCE_H_