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

services/media/framework/models/active_sink.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_SINK_H_
+#define MOJO_MEDIA_MODELS_ACTIVE_SINK_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 {
+
+// Sink that consumes packets asynchronously.
+class ActiveSink {
+ public:
+  using DemandCallback = std::function<void(Demand demand)>;
+
+  virtual ~ActiveSink() {}
+
+  // Indicates whether the sink must allocate.
+  virtual bool must_allocate() const = 0;
+
+  // The consumer's allocator. Can return nullptr, in which case the default
+  // allocator should be used.
+  virtual Allocator* allocator() = 0;
+
+  // Sets the callback that signals demand asynchronously.
+  virtual void SetDemandCallback(DemandCallback demand_callback) = 0;
+
+  // Initiates demand.
+  virtual void Prime() = 0;
+
+  // Supplies a packet to the sink.
+  virtual Demand SupplyPacket(PacketPtr packet) = 0;
+};
+
+typedef std::shared_ptr<ActiveSink> ActiveSinkPtr;
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // MOJO_MEDIA_MODELS_ACTIVE_SINK_H_