118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <samplerate.h>
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#include "util.h"
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#define BUFFER_LEN 2048
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static void simple_test (int converter, double ratio) ;
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int
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main (void)
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{ static double src_ratios [] =
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{ 1.0001, 0.099, 0.1, 0.33333333, 0.789, 1.9, 3.1, 9.9
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} ;
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int k ;
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puts ("") ;
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puts (" Zero Order Hold interpolator :") ;
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for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
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simple_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
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puts (" Linear interpolator :") ;
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for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
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simple_test (SRC_LINEAR, src_ratios [k]) ;
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puts (" Sinc interpolator :") ;
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for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
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simple_test (SRC_SINC_FASTEST, src_ratios [k]) ;
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puts ("") ;
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return 0 ;
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} /* main */
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static void
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simple_test (int converter, double src_ratio)
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{ static float input [BUFFER_LEN], output [BUFFER_LEN] ;
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SRC_DATA src_data ;
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int input_len, output_len, error, terminate ;
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printf ("\tsimple_test (SRC ratio = %6.4f) ........... ", src_ratio) ;
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fflush (stdout) ;
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/* Calculate maximun input and output lengths. */
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if (src_ratio >= 1.0)
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{ output_len = BUFFER_LEN ;
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input_len = (int) floor (BUFFER_LEN / src_ratio) ;
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}
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else
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{ input_len = BUFFER_LEN ;
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output_len = (int) floor (BUFFER_LEN * src_ratio) ;
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} ;
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/* Reduce input_len by 10 so output is longer than necessary. */
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input_len -= 10 ;
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if (output_len > BUFFER_LEN)
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{ printf ("\n\nLine %d : output_len > BUFFER_LEN\n\n", __LINE__) ;
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exit (1) ;
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} ;
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memset (&src_data, 0, sizeof (src_data)) ;
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src_data.data_in = input ;
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src_data.input_frames = input_len ;
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src_data.src_ratio = src_ratio ;
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src_data.data_out = output ;
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src_data.output_frames = BUFFER_LEN ;
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if ((error = src_simple (&src_data, converter, 1)))
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{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
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exit (1) ;
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} ;
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terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;
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if (fabs (src_data.output_frames_gen - src_ratio * input_len) > 2 * terminate)
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{ printf ("\n\nLine %d : bad output data length %ld should be %d.\n", __LINE__,
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src_data.output_frames_gen, (int) floor (src_ratio * input_len)) ;
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printf ("\tsrc_ratio : %.4f\n", src_ratio) ;
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printf ("\tinput_len : %d\n\toutput_len : %d\n\n", input_len, output_len) ;
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exit (1) ;
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} ;
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puts ("ok") ;
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return ;
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} /* simple_test */
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