Re-Land: Implement AudioReceiveStream::GetStats().

R=tommi@webrtc.org
BUG=webrtc:4690

Committed: https://chromium.googlesource.com/external/webrtc/+/a457752f4afc496ed7f4d6b584b08d8635f18cc0

Review URL: https://codereview.webrtc.org/1390753002 .

Cr-Commit-Position: refs/heads/master@{#10369}
diff --git a/webrtc/audio/conversion.h b/webrtc/audio/conversion.h
new file mode 100644
index 0000000..c1cf9b6
--- /dev/null
+++ b/webrtc/audio/conversion.h
@@ -0,0 +1,22 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_AUDIO_CONVERSION_H_
+#define WEBRTC_AUDIO_CONVERSION_H_
+
+namespace webrtc {
+
+// Convert fixed point number with 14 bit fractional part, to floating point.
+inline float Q14ToFloat(uint16_t v) {
+  return static_cast<float>(v) / (1 << 14);
+}
+}  // namespace webrtc
+
+#endif  // WEBRTC_AUDIO_CONVERSION_H_