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

services/media/framework/lpcm_util.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_LPCM_UTIL_H_
+#define SERVICES_MEDIA_FRAMEWORK_LPCM_UTIL_H_
+
+#include "services/media/framework/stream_type.h"
+
+namespace mojo {
+namespace media {
+
+// Helper class that performs various LPCM processing functions.
+class LpcmUtil {
+ public:
+  static LpcmUtil* Create(const LpcmStreamType& stream_type);
+
+  // Fills the buffer with silence.
+  virtual void Silence(void* buffer, uint64_t frame_count) const = 0;
+
+  // Copies samples.
+  virtual void Copy(void* in, void* out, uint64_t frame_count) const = 0;
+
+  // Mixes samples.
+  virtual void Mix(void* in, void* out, uint64_t frame_count) const = 0;
+
+  // Interleaves non-interleaved samples.
+  virtual void Interleave(
+      void* in,
+      uint64_t in_byte_count,
+      void* out,
+      uint64_t frame_count) const = 0;
+};
+
+// LpcmUtil implementation that processes samples of type T.
+template<typename T>
+class LpcmUtilImpl : public LpcmUtil {
+ public:
+  LpcmUtilImpl(const LpcmStreamType& stream_type);
+
+  ~LpcmUtilImpl();
+
+  void Silence(void* buffer, uint64_t frame_count) const override;
+
+  void Copy(void* in, void* out, uint64_t frame_count) const override;
+
+  void Mix(void* in, void* out, uint64_t frame_count) const override;
+
+  void Interleave(
+      void* in,
+      uint64_t in_byte_count,
+      void* out,
+      uint64_t frame_count) const override;
+
+ private:
+  LpcmStreamType stream_type_;
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // SERVICES_MEDIA_FRAMEWORK_LPCM_UTIL_H_