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 // 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 #include "media/base/media_shmem_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_SHMEM_EXPORT void FMAC(const float src[], float scale, int len, float dest[]); // Multiply each element of |src| by |scale| and store in |dest|. |src| and // |dest| must be aligned by kRequiredAlignment. MEDIA_SHMEM_EXPORT void FMUL(const float src[], float scale, int len, float dest[]); // 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_SHMEM_EXPORT std::pair EWMAAndMaxPower( float initial_value, const float src[], int len, float smoothing_factor); } // namespace vector_math } // namespace media #endif // MEDIA_BASE_VECTOR_MATH_H_