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

services/media/framework/parts/decoder.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 SERVICES_MEDIA_FRAMEWORK_PARTS_DECODER_H_
+#define SERVICES_MEDIA_FRAMEWORK_PARTS_DECODER_H_
+
+#include "services/media/framework/allocator.h"
+#include "services/media/framework/models/packet_transform.h"
+#include "services/media/framework/packet.h"
+#include "services/media/framework/result.h"
+#include "services/media/framework/stream_type.h"
+
+namespace mojo {
+namespace media {
+
+class Decoder;
+
+typedef SharedPtr<Decoder, PacketTransform> DecoderPtr;
+
+// Abstract base class for transforms that decode compressed media.
+class Decoder : public PacketTransform {
+ public:
+  // Creates a Decoder object for a given stream type.
+  static Result Create(
+      const StreamTypePtr& stream_type,
+      DecoderPtr* decoder_out);
+
+  ~Decoder() override {}
+
+  // Returns the type of the stream the decoder will produce.
+  virtual StreamTypePtr output_stream_type() = 0;
+
+ protected:
+  // Initializes the decoder. Called by Decoder::Create.
+  virtual Result Init(const StreamTypePtr& stream_type) = 0;
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // SERVICES_MEDIA_FRAMEWORK_PARTS_DECODER_H_