LCOV - code coverage report
Current view: top level - libavcodec/tests - iirfilter.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 14 14 100.0 %
Date: 2017-10-24 00:14:43 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #include <math.h>
      20             : #include <stdint.h>
      21             : #include <stdio.h>
      22             : 
      23             : #include "libavutil/libm.h"
      24             : 
      25             : #include "libavcodec/iirfilter.h"
      26             : 
      27             : #define FILT_ORDER 4
      28             : #define SIZE 1024
      29             : 
      30           1 : int main(void)
      31             : {
      32           1 :     struct FFIIRFilterCoeffs *fcoeffs = NULL;
      33           1 :     struct FFIIRFilterState  *fstate  = NULL;
      34           1 :     float cutoff_coeff = 0.4;
      35             :     int16_t x[SIZE], y[SIZE];
      36             :     int i;
      37             : 
      38           1 :     fcoeffs = ff_iir_filter_init_coeffs(NULL, FF_FILTER_TYPE_BUTTERWORTH,
      39             :                                         FF_FILTER_MODE_LOWPASS, FILT_ORDER,
      40             :                                         cutoff_coeff, 0.0, 0.0);
      41           1 :     fstate  = ff_iir_filter_init_state(FILT_ORDER);
      42             : 
      43        1025 :     for (i = 0; i < SIZE; i++)
      44        1024 :         x[i] = lrint(0.75 * INT16_MAX * sin(0.5 * M_PI * i * i / SIZE));
      45             : 
      46           1 :     ff_iir_filter(fcoeffs, fstate, SIZE, x, 1, y, 1);
      47             : 
      48        1025 :     for (i = 0; i < SIZE; i++)
      49        1024 :         printf("%6d %6d\n", x[i], y[i]);
      50             : 
      51           1 :     ff_iir_filter_free_coeffsp(&fcoeffs);
      52           1 :     ff_iir_filter_free_statep(&fstate);
      53           1 :     return 0;
      54             : }

Generated by: LCOV version 1.13