Split AudioRendererMixer::VectorFMAC into VectorMath library.

media/base/vector_math.h

+// Copyright (c) 2012 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 MEDIA_BASE_VECTOR_MATH_H_
+#define MEDIA_BASE_VECTOR_MATH_H_
+
+#include "media/base/media_export.h"
+
+namespace media {
+namespace vector_math {
+
+// Required alignment for inputs and outputs to all vector math functions
+enum { kRequiredAlignment = 16 };
+
+// Multiply each element of |src| (up to |len|) by |scale| and add to |dest|.
+// |src| and |dest| must be aligned by kRequiredAlignment.
+MEDIA_EXPORT void FMAC(const float src[], float scale, int len, float dest[]);
+
+}  // namespace vector_math
+}  // namespace media
+
+#endif  // MEDIA_BASE_VECTOR_MATH_H_