text: /*
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #ifndef AVUTIL_FLOAT_DSP_H
  #define AVUTIL_FLOAT_DSP_H
  
  #include "config.h"
  
  typedef struct AVFloatDSPContext {
      /**
       * Calculate the entry wise product of two vectors of floats and store the result in
       * a vector of floats.
       *
       * @param dst  output vector
       *             constraints: 32-byte aligned
       * @param src0 first input vector
       *             constraints: 32-byte aligned
       * @param src1 second input vector
       *             constraints: 32-byte aligned
       * @param len  number of elements in the input
       *             constraints: multiple of 16
       */
      void (*vector_fmul)(float *dst, const float *src0, const float *src1,
                          int len);
  
      /**
       * Multiply a vector of floats by a scalar float and add to
       * destination vector.  Source and destination vectors must
       * overlap exactly or not at all.
       *
       * @param dst result vector
       *            constraints: 32-byte aligned
       * @param src input vector
       *            constraints: 32-byte aligned
       * @param mul scalar value
       * @param len length of vector
       *            constraints: multiple of 16
       */
      void (*vector_fmac_scalar)(float *dst, const float *src, float mul,
                                 int len);
  
      /**
       * Multiply a vector of floats by a scalar float.  Source and
       * destination vectors must overlap exactly or not at all.
       *
       * @param dst result vector
       *            constraints: 16-byte aligned
       * @param src input vector
       *            constraints: 16-byte aligned
       * @param mul scalar value
       * @param len length of vector
       *            constraints: multiple of 4
       */
      void (*vector_fmul_scalar)(float *dst, const float *src, float mul,
                                 int len);
  
      /**
       * Multiply a vector of double by a scalar double.  Source and
       * destination vectors must overlap exactly or not at all.
       *
       * @param dst result vector
       *            constraints: 32-byte aligned
       * @param src input vector
       *            constraints: 32-byte aligned
       * @param mul scalar value
       * @param len length of vector
       *            constraints: multiple of 8
       */
      void (*vector_dmul_scalar)(double *dst, const double *src, double mul,
                                 int len);
  
      /**
       * Overlap/add with window function.
       * Used primarily by MDCT-based audio codecs.
       * Source and destination vectors must overlap exactly or not at all.
       *
       * @param dst  result vector
       *             constraints: 16-byte aligned
       * @param src0 first source vector
       *             constraints: 16-byte aligned
       * @param src1 second source vector
       *             constraints: 16-byte aligned
       * @param win  half-window vector
       *             constraints: 16-byte aligned
       * @param len  length of vector
       *             constraints: multiple of 4
       */
      void (*vector_fmul_window)(float *dst, const float *src0,
                                 const float *src1, const float *win, int len);
  
      /**
       * Calculate the entry wise product of two vectors of floats, add a third vector of
       * floats and store the result in a vector of floats.
       *
       * @param dst  output vector
       *             constraints: 32-byte aligned
       * @param src0 first input vector
       *             constraints: 32-byte aligned
       * @param src1 second input vector
       *             constraints: 32-byte aligned
       * @param src2 third input vector
       *             constraints: 32-byte aligned
       * @param len  number of elements in the input
       *             constraints: multiple of 16
       */
      void (*vector_fmul_add)(float *dst, const float *src0, const float *src1,
                              const float *src2, int len);
  
      /**
       * Calculate the entry wise product of two vectors of floats, and store the result
       * in a vector of floats. The second vector of floats is iterated over
       * in reverse order.
       *
       * @param dst  output vector
       *             constraints: 32-byte aligned
       * @param src0 first input vector
       *             constraints: 32-byte aligned
       * @param src1 second input vector
       *             constraints: 32-byte aligned
       * @param len  number of elements in the input
       *             constraints: multiple of 16
       */
      void (*vector_fmul_reverse)(float *dst, const float *src0,
                                  const float *src1, int len);
  
      /**
       * Calculate the sum and difference of two vectors of floats.
       *
       * @param v1  first input vector, sum output, 16-byte aligned
       * @param v2  second input vector, difference output, 16-byte aligned
       * @param len length of vectors, multiple of 4
       */
      void (*butterflies_float)(float *av_restrict v1, float *av_restrict v2, int len);
  
      /**
       * Calculate the scalar product of two vectors of floats.
       *
       * @param v1  first vector, 16-byte aligned
       * @param v2  second vector, 16-byte aligned
       * @param len length of vectors, multiple of 4
       *
       * @return sum of elementwise products
       */
      float (*scalarproduct_float)(const float *v1, const float *v2, int len);
  } AVFloatDSPContext;
  
  /**
   * Return the scalar product of two vectors.
   *
   * @param v1  first input vector
   * @param v2  first input vector
   * @param len number of elements
   *
   * @return sum of elementwise products
   */
  float avpriv_scalarproduct_float_c(const float *v1, const float *v2, int len);
  
  void ff_float_dsp_init_aarch64(AVFloatDSPContext *fdsp);
  void ff_float_dsp_init_arm(AVFloatDSPContext *fdsp);
  void ff_float_dsp_init_ppc(AVFloatDSPContext *fdsp, int strict);
  void ff_float_dsp_init_x86(AVFloatDSPContext *fdsp);
  void ff_float_dsp_init_mips(AVFloatDSPContext *fdsp);
  
  /**
   * Allocate a float DSP context.
   *
   * @param strict  setting to non-zero avoids using functions which may not be IEEE-754 compliant
   */
  AVFloatDSPContext *avpriv_float_dsp_alloc(int strict);
  
  #endif /* AVUTIL_FLOAT_DSP_H */
  