LCOV - code coverage report
Current view: top level - libavcodec - cbrt_tablegen.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 18 18 100.0 %
Date: 2017-12-16 13:57:32 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Header file for hardcoded AAC cube-root table
       3             :  *
       4             :  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
       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_CBRT_TABLEGEN_H
      24             : #define AVCODEC_CBRT_TABLEGEN_H
      25             : 
      26             : #include <stdint.h>
      27             : #include <math.h>
      28             : #include "libavutil/attributes.h"
      29             : #include "libavutil/intfloat.h"
      30             : #include "libavcodec/aac_defines.h"
      31             : 
      32             : #if USE_FIXED
      33             : #define CBRT(x) lrint((x) * 8192)
      34             : #else
      35             : #define CBRT(x) av_float2int((float)(x))
      36             : #endif
      37             : 
      38             : uint32_t AAC_RENAME(ff_cbrt_tab)[1 << 13];
      39             : 
      40         160 : av_cold void AAC_RENAME(ff_cbrt_tableinit)(void)
      41             : {
      42             :     static double cbrt_tab_dbl[1 << 13];
      43         160 :     if (!AAC_RENAME(ff_cbrt_tab)[(1<<13) - 1]) {
      44             :         int i, j, k;
      45             :         double cbrt_val;
      46             : 
      47     1310720 :         for (i = 1; i < 1<<13; i++)
      48     1310560 :             cbrt_tab_dbl[i] = 1;
      49             : 
      50             :         /* have to take care of non-squarefree numbers */
      51       14240 :         for (i = 2; i < 90; i++) {
      52       14080 :             if (cbrt_tab_dbl[i] == 1) {
      53        3840 :                 cbrt_val = i * cbrt(i);
      54       15520 :                 for (k = i; k < 1<<13; k *= i)
      55     3364320 :                     for (j = k; j < 1<<13; j += k)
      56     3352640 :                         cbrt_tab_dbl[j] *= cbrt_val;
      57             :             }
      58             :         }
      59             : 
      60      648320 :         for (i = 91; i <= 8191; i+= 2) {
      61      648160 :             if (cbrt_tab_dbl[i] == 1) {
      62      160640 :                 cbrt_val = i * cbrt(i);
      63      967680 :                 for (j = i; j < 1<<13; j += i)
      64      807040 :                     cbrt_tab_dbl[j] *= cbrt_val;
      65             :             }
      66             :         }
      67             : 
      68     1310880 :         for (i = 0; i < 1<<13; i++)
      69     1310720 :             AAC_RENAME(ff_cbrt_tab)[i] = CBRT(cbrt_tab_dbl[i]);
      70             :     }
      71         160 : }
      72             : 
      73             : #endif /* AVCODEC_CBRT_TABLEGEN_H */

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