media/base/vector_math.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_BASE_VECTOR_MATH_H_
   6 #define MEDIA_BASE_VECTOR_MATH_H_
   7
   8 #include "media/base/media_export.h"
   9
  10 namespace media {
  11 namespace vector_math {
  12
  13 // Required alignment for inputs and outputs to all vector math functions
  14 enum { kRequiredAlignment = 16 };
  15
  16 // Selects runtime specific optimizations such as SSE.  Must be called prior to
  17 // calling FMAC() or FMUL().  Called during media library initialization; most
  18 // users should never have to call this.
  19 MEDIA_EXPORT void Initialize();
  20
  21 // Multiply each element of |src| (up to |len|) by |scale| and add to |dest|.
  22 // |src| and |dest| must be aligned by kRequiredAlignment.
  23 MEDIA_EXPORT void FMAC(const float src[], float scale, int len, float dest[]);
  24
  25 // Multiply each element of |src| by |scale| and store in |dest|.  |src| and
  26 // |dest| must be aligned by kRequiredAlignment.
  27 MEDIA_EXPORT void FMUL(const float src[], float scale, int len, float dest[]);
  28
  29 }  // namespace vector_math
  30 }  // namespace media
  31
  32 #endif  // MEDIA_BASE_VECTOR_MATH_H_