LCOV - code coverage report
Current view: top level - libavutil - fixed_dsp.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 16 17 94.1 %
Date: 2017-10-18 21:45:51 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012
       3             :  *      MIPS Technologies, Inc., California.
       4             :  *
       5             :  * Redistribution and use in source and binary forms, with or without
       6             :  * modification, are permitted provided that the following conditions
       7             :  * are met:
       8             :  * 1. Redistributions of source code must retain the above copyright
       9             :  *    notice, this list of conditions and the following disclaimer.
      10             :  * 2. Redistributions in binary form must reproduce the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer in the
      12             :  *    documentation and/or other materials provided with the distribution.
      13             :  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
      14             :  *    contributors may be used to endorse or promote products derived from
      15             :  *    this software without specific prior written permission.
      16             :  *
      17             :  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
      18             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      19             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      20             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
      21             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      22             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      23             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      24             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      25             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      26             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      27             :  * SUCH DAMAGE.
      28             :  *
      29             :  * Author:  Nedeljko Babic (nbabic@mips.com)
      30             :  *
      31             :  * This file is part of FFmpeg.
      32             :  *
      33             :  * FFmpeg is free software; you can redistribute it and/or
      34             :  * modify it under the terms of the GNU Lesser General Public
      35             :  * License as published by the Free Software Foundation; either
      36             :  * version 2.1 of the License, or (at your option) any later version.
      37             :  *
      38             :  * FFmpeg is distributed in the hope that it will be useful,
      39             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      40             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      41             :  * Lesser General Public License for more details.
      42             :  *
      43             :  * You should have received a copy of the GNU Lesser General Public
      44             :  * License along with FFmpeg; if not, write to the Free Software
      45             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      46             :  */
      47             : 
      48             : #ifndef AVUTIL_FIXED_DSP_H
      49             : #define AVUTIL_FIXED_DSP_H
      50             : 
      51             : #include <stdint.h>
      52             : #include "attributes.h"
      53             : #include "common.h"
      54             : #include "libavcodec/mathops.h"
      55             : 
      56             : typedef struct AVFixedDSPContext {
      57             :     /* Assume len is a multiple of 16, and arrays are 32-byte aligned */
      58             :     /* Results of multiplications are scaled down by 31 bit (and rounded) if not
      59             :      * stated otherwise */
      60             : 
      61             :     /**
      62             :      * Overlap/add with window function.
      63             :      * Result is scaled down by "bits" bits.
      64             :      * Used primarily by MDCT-based audio codecs.
      65             :      * Source and destination vectors must overlap exactly or not at all.
      66             :      *
      67             :      * @param dst  result vector
      68             :      *             constraints: 16-byte aligned
      69             :      * @param src0 first source vector
      70             :      *             constraints: 16-byte aligned
      71             :      * @param src1 second source vector
      72             :      *             constraints: 16-byte aligned
      73             :      * @param win  half-window vector
      74             :      *             constraints: 16-byte aligned
      75             :      * @param len  length of vector
      76             :      *             constraints: multiple of 4
      77             :      * @param bits scaling parameter
      78             :      *
      79             :      */
      80             :     void (*vector_fmul_window_scaled)(int16_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len, uint8_t bits);
      81             : 
      82             :     /**
      83             :      * Overlap/add with window function.
      84             :      * Used primarily by MDCT-based audio codecs.
      85             :      * Source and destination vectors must overlap exactly or not at all.
      86             :      *
      87             :      * @param dst  result vector
      88             :      *             constraints: 32-byte aligned
      89             :      * @param src0 first source vector
      90             :      *             constraints: 16-byte aligned
      91             :      * @param src1 second source vector
      92             :      *             constraints: 16-byte aligned
      93             :      * @param win  half-window vector
      94             :      *             constraints: 16-byte aligned
      95             :      * @param len  length of vector
      96             :      *             constraints: multiple of 4
      97             :      */
      98             :     void (*vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len);
      99             : 
     100             :     /**
     101             :      * Fixed-point multiplication that calculates the entry wise product of two
     102             :      * vectors of integers and stores the result in a vector of integers.
     103             :      *
     104             :      * @param dst  output vector
     105             :      *             constraints: 32-byte aligned
     106             :      * @param src0 first input vector
     107             :      *             constraints: 32-byte aligned
     108             :      * @param src1 second input vector
     109             :      *             constraints: 32-byte aligned
     110             :      * @param len  number of elements in the input
     111             :      *             constraints: multiple of 16
     112             :      */
     113             :     void (*vector_fmul)(int *dst, const int *src0, const int *src1,
     114             :                         int len);
     115             : 
     116             :     void (*vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len);
     117             :     /**
     118             :      * Calculate the entry wise product of two vectors of integers, add a third vector of
     119             :      * integers and store the result in a vector of integers.
     120             :      *
     121             :      * @param dst  output vector
     122             :      *             constraints: 32-byte aligned
     123             :      * @param src0 first input vector
     124             :      *             constraints: 32-byte aligned
     125             :      * @param src1 second input vector
     126             :      *             constraints: 32-byte aligned
     127             :      * @param src2 third input vector
     128             :      *             constraints: 32-byte aligned
     129             :      * @param len  number of elements in the input
     130             :      *             constraints: multiple of 16
     131             :      */
     132             :     void (*vector_fmul_add)(int *dst, const int *src0, const int *src1,
     133             :                             const int *src2, int len);
     134             : 
     135             :     /**
     136             :      * Calculate the scalar product of two vectors of integers.
     137             :      *
     138             :      * @param v1  first vector, 16-byte aligned
     139             :      * @param v2  second vector, 16-byte aligned
     140             :      * @param len length of vectors, multiple of 4
     141             :      *
     142             :      * @return sum of elementwise products
     143             :      */
     144             :     int (*scalarproduct_fixed)(const int *v1, const int *v2, int len);
     145             : 
     146             :     /**
     147             :      * Calculate the sum and difference of two vectors of integers.
     148             :      *
     149             :      * @param v1  first input vector, sum output, 16-byte aligned
     150             :      * @param v2  second input vector, difference output, 16-byte aligned
     151             :      * @param len length of vectors, multiple of 4
     152             :      */
     153             :     void (*butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len);
     154             : } AVFixedDSPContext;
     155             : 
     156             : /**
     157             :  * Allocate and initialize a fixed DSP context.
     158             :  * note: should be freed with a av_free call when no longer needed.
     159             :  *
     160             :  * @param strict  setting to non-zero avoids using functions which may not be IEEE-754 compliant
     161             :  */
     162             : AVFixedDSPContext * avpriv_alloc_fixed_dsp(int strict);
     163             : 
     164             : void ff_fixed_dsp_init_x86(AVFixedDSPContext *fdsp);
     165             : 
     166             : /**
     167             :  * Calculate the square root
     168             :  *
     169             :  * @param x    input fixed point number
     170             :  *
     171             :  * @param bits format of fixed point number (32 - bits).bits
     172             :  *
     173             :  * note: input is normalized to (0, 1) fixed point value
     174             :  */
     175             : 
     176      137931 : static av_always_inline int fixed_sqrt(int x, int bits)
     177             : {
     178             :     int retval, bit_mask, guess, square, i;
     179             :     int64_t accu;
     180      137931 :     int shift1 = 30 - bits;
     181      137931 :     int shift2 = bits - 15;
     182             : 
     183      137931 :     if (shift1 > 0) retval = ff_sqrt(x << shift1);
     184      137931 :     else retval = ff_sqrt(x >> -shift1);
     185             : 
     186      137931 :     if (shift2 > 0) {
     187      137931 :         retval = retval << shift2;
     188      137931 :         bit_mask = (1 << (shift2 - 1));
     189             : 
     190     2344827 :         for (i=0; i<shift2; i++){
     191     2206896 :             guess = retval + bit_mask;
     192     2206896 :             accu = (int64_t)guess * guess;
     193     2206896 :             square = (int)((accu + bit_mask) >> bits);
     194     2206896 :             if (x >= square)
     195     1102901 :                 retval += bit_mask;
     196     2206896 :             bit_mask >>= 1;
     197             :         }
     198             : 
     199             :     }
     200           0 :     else retval >>= (-shift2);
     201             : 
     202      137931 :     return retval;
     203             : }
     204             : 
     205             : #endif /* AVUTIL_FIXED_DSP_H */

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