LCOV - code coverage report
Current view: top level - libavcodec - celp_math.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 3 0.0 %
Date: 2017-12-11 04:34:20 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Various fixed-point math operations
       3             :  *
       4             :  * Copyright (c) 2008 Vladimir Voroshilov
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #ifndef AVCODEC_CELP_MATH_H
      24             : #define AVCODEC_CELP_MATH_H
      25             : 
      26             : #include <stdint.h>
      27             : 
      28             : typedef struct CELPMContext {
      29             :     /**
      30             :      * Return the dot product.
      31             :      * @param a input data array
      32             :      * @param b input data array
      33             :      * @param length number of elements
      34             :      *
      35             :      * @return dot product = sum of elementwise products
      36             :      */
      37             :     float (*dot_productf)(const float* a, const float* b, int length);
      38             : 
      39             : }CELPMContext;
      40             : 
      41             : /**
      42             :  * Initialize CELPMContext.
      43             :  */
      44             : void ff_celp_math_init(CELPMContext *c);
      45             : void ff_celp_math_init_mips(CELPMContext *c);
      46             : 
      47             : /**
      48             :  * fixed-point implementation of exp2(x) in [0; 1] domain.
      49             :  * @param power argument to exp2, 0 <= power <= 0x7fff
      50             :  *
      51             :  * @return value of (1<<20) * exp2(power / (1<<15))
      52             :  *         0x8000c <= result <= 0xfffea
      53             :  */
      54             : int ff_exp2(uint16_t power);
      55             : 
      56             : /**
      57             :  * Calculate log2(x).
      58             :  * @param value function argument, 0 < value <= 7fff ffff
      59             :  *
      60             :  * @return value of (1<<15) * log2(value)
      61             :  */
      62             : int ff_log2_q15(uint32_t value);
      63             : 
      64             : /**
      65             :  * Calculate the dot product of 2 int16_t vectors.
      66             :  * @param a input data array
      67             :  * @param b input data array
      68             :  * @param length number of elements
      69             :  *
      70             :  * @return dot product = sum of elementwise products
      71             :  */
      72             : int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length);
      73             : 
      74             : /**
      75             :  * Shift value left or right depending on sign of offset parameter.
      76             :  * @param value value to shift
      77             :  * @param offset shift offset
      78             :  *
      79             :  * @return value << offset, if offset>=0; value >> -offset - otherwise
      80             :  */
      81           0 : static inline int bidir_sal(int value, int offset)
      82             : {
      83           0 :     if(offset < 0) return value >> -offset;
      84           0 :     else           return value <<  offset;
      85             : }
      86             : 
      87             : /**
      88             :  * Return the dot product.
      89             :  * @param a input data array
      90             :  * @param b input data array
      91             :  * @param length number of elements
      92             :  *
      93             :  * @return dot product = sum of elementwise products
      94             :  */
      95             : float ff_dot_productf(const float* a, const float* b, int length);
      96             : 
      97             : #endif /* AVCODEC_CELP_MATH_H */

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