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

services/media/framework/models/lpcm_transform.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_LPCM_TRANSFORM_H_
+#define MOJO_MEDIA_MODELS_LPCM_TRANSFORM_H_
+
+#include <memory>
+
+#include "services/media/framework/models/lpcm_frames.h"
+#include "services/media/framework/stream_type.h"
+
+namespace mojo {
+namespace media {
+
+// Synchronous lpcm transform.
+class LpcmTransform {
+ public:
+  virtual ~LpcmTransform() {}
+
+  // Gets the input stream type.
+  virtual const LpcmStreamType& input_stream_type() const = 0;
+
+  // Gets the output stream type.
+  virtual const LpcmStreamType& output_stream_type() const = 0;
+
+  // Processes frames.
+  virtual void TransformFrames(
+      LpcmFrames* source,

[jeffbrown, 2016/02/02 05:35:47]

const?

[dalesat, 2016/02/02 21:46:39]

No, because the function calls source->Advance, reflecting the consumption of
the frames.

+      LpcmFrames* dest,
+      bool mix) = 0;

[jeffbrown, 2016/02/02 05:35:47]

Consider eliminating the bool and adding another method instead or a different
type.

[dalesat, 2016/02/02 21:46:39]

Acknowledged.

+};
+
+typedef std::shared_ptr<LpcmTransform> LpcmTransformPtr;
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // MOJO_MEDIA_MODELS_LPCM_TRANSFORM_H_