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

services/media/framework/models/multistream_packet_source.h

Index: services/media/framework/models/multistream_packet_source.h
diff --git a/services/media/framework/models/multistream_packet_source.h b/services/media/framework/models/multistream_packet_source.h
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+// 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_MULTISTREAM_PACKET_SOURCE_H_
+#define MOJO_MEDIA_MODELS_MULTISTREAM_PACKET_SOURCE_H_
+
+#include <memory>
+
+#include "services/media/framework/packet.h"
+
+namespace mojo {
+namespace media {
+
+// Synchronous source of packets for multiple streams. This is currently used
+// by Demux, though it would be better if Demux were asynchronous.
+class MultiStreamPacketSource {
+ public:
+  virtual ~MultiStreamPacketSource() {}
+
+  // Returns the number of streams the source produces.
+  virtual uint32_t stream_count() const = 0;
+
+  // Gets a packet for the stream indicated via stream_index_out. This call
+  // should always produce a packet until end-of-stream. The caller is
+  // responsible for releasing the packet.
+  virtual PacketPtr PullPacket(uint32_t *stream_index_out) = 0;
+};
+
+typedef std::shared_ptr<MultiStreamPacketSource> MultiStreamPacketSourcePtr;
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // MOJO_MEDIA_MODELS_MULTISTREAM_PACKET_SOURCE_H_