Enhance AudioSplicer to crossfade marked splice frames.

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 <utility>
 
 #include "media/base/media_export.h"
@@ skipping 20 matching lines @@
 // Computes the exponentially-weighted moving average power of a signal by
 // iterating the recurrence:
 //
 //   y[-1] = initial_value
 //   y[n] = smoothing_factor * src[n]^2 + (1-smoothing_factor) * y[n-1]
 //
 // Returns the final average power and the maximum squared element value.
 MEDIA_EXPORT std::pair<float, float> EWMAAndMaxPower(
     float initial_value, const float src[], int len, float smoothing_factor);
 
+MEDIA_EXPORT void Crossfade(const float src[], int len, float dest[]);
+
 }  // namespace vector_math
 }  // namespace media
 
 #endif  // MEDIA_BASE_VECTOR_MATH_H_