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

services/media/framework/models/lpcm_frames.h

Index: services/media/framework/models/lpcm_frames.h
diff --git a/services/media/framework/models/lpcm_frames.h b/services/media/framework/models/lpcm_frames.h
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+++ b/services/media/framework/models/lpcm_frames.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_LPCM_FRAMES_H_
+#define MOJO_MEDIA_MODELS_LPCM_FRAMES_H_
+
+#include <cstdint>
+
+#include "base/logging.h"
+
+namespace mojo {
+namespace media {
+
+// References LPCM frames.
+struct LpcmFrames {
+  LpcmFrames() :
+      buffer_(nullptr),
+      frame_count_(0),
+      bytes_per_frame_(0) {}
+
+  void advance(uint64_t frames) {
+    DCHECK(frames <= frame_count_);
+    buffer_ = reinterpret_cast<uint8_t*>(buffer_) + (frames * bytes_per_frame_);
+    frame_count_ -= frames;
+  }
+
+  void* buffer_;
+  uint64_t frame_count_;
+  uint32_t bytes_per_frame_;
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif // MOJO_MEDIA_MODELS_LPCM_FRAMES_H_