mirror of
https://github.com/cookiengineer/audacity
synced 2025-11-04 08:04:06 +01:00
153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*
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** Copyright (C) 2006-2008 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 <math.h>
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#include <string.h>
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#include <samplerate.h>
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#include "util.h"
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#define BUFFER_LEN (1 << 16)
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static void varispeed_test (int converter, double target_snr) ;
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int
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main (void)
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{
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puts ("") ;
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printf (" Zero Order Hold interpolator : ") ;
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varispeed_test (SRC_ZERO_ORDER_HOLD, 10.0) ;
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printf (" Linear interpolator : ") ;
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varispeed_test (SRC_LINEAR, 10.0) ;
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printf (" Sinc interpolator : ") ;
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varispeed_test (SRC_SINC_FASTEST, 115.0) ;
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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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varispeed_test (int converter, double target_snr)
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{ static float input [BUFFER_LEN], output [BUFFER_LEN] ;
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double sine_freq, snr ;
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SRC_STATE *src_state ;
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SRC_DATA src_data ;
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int input_len, error ;
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memset (input, 0, sizeof (input)) ;
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input_len = ARRAY_LEN (input) / 2 ;
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sine_freq = 0.0111 ;
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gen_windowed_sines (1, &sine_freq, 1.0, input, input_len) ;
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/* Perform sample rate conversion. */
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if ((src_state = src_new (converter, 1, &error)) == NULL)
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{ printf ("\n\nLine %d : src_new() failed : %s\n\n", __LINE__, src_strerror (error)) ;
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exit (1) ;
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} ;
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src_data.end_of_input = 1 ;
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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 = 3.0 ;
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src_data.data_out = output ;
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src_data.output_frames = ARRAY_LEN (output) ;
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if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
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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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if ((error = src_process (src_state, &src_data)))
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{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
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printf (" src_data.input_frames : %ld\n", src_data.input_frames) ;
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printf (" src_data.output_frames : %ld\n\n", src_data.output_frames) ;
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exit (1) ;
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} ;
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if (src_data.input_frames_used != input_len)
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{ printf ("\n\nLine %d : unused input.\n", __LINE__) ;
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printf ("\tinput_len : %d\n", input_len) ;
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printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
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exit (1) ;
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} ;
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/* Copy the last output to the input. */
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memcpy (input, output, sizeof (input)) ;
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reverse_data (input, src_data.output_frames_gen) ;
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if ((error = src_reset (src_state)))
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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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src_data.end_of_input = 1 ;
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src_data.data_in = input ;
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input_len = src_data.input_frames = src_data.output_frames_gen ;
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src_data.data_out = output ;
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src_data.output_frames = ARRAY_LEN (output) ;
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if ((error = src_set_ratio (src_state, 1.0 / src_data.src_ratio)))
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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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if ((error = src_process (src_state, &src_data)))
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{ printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
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printf (" src_data.input_frames : %ld\n", src_data.input_frames) ;
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printf (" src_data.output_frames : %ld\n\n", src_data.output_frames) ;
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exit (1) ;
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} ;
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if (src_data.input_frames_used != input_len)
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{ printf ("\n\nLine %d : unused input.\n", __LINE__) ;
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printf ("\tinput_len : %d\n", input_len) ;
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printf ("\tinput_frames_used : %ld\n\n", src_data.input_frames_used) ;
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exit (1) ;
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} ;
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src_state = src_delete (src_state) ;
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snr = calculate_snr (output, src_data.output_frames_gen, 1) ;
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if (target_snr > snr)
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{ printf ("\n\nLine %d : snr (%3.1f) does not meet target (%3.1f)\n\n", __LINE__, snr, target_snr) ;
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save_oct_float ("varispeed.mat", input, src_data.input_frames, output, src_data.output_frames_gen) ;
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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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} /* varispeed_test */
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