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149 lines
3.7 KiB
149 lines
3.7 KiB
/*
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** Copyright (c) 2002-2016, Erik de Castro Lopo <erikd@mega-nerd.com>
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** All rights reserved.
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**
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** This code is released under 2-clause BSD license. Please see the
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** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <stdio.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 (1<<15)
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#define BLOCK_LEN 100
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static void stream_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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{ 0.3, 0.9, 1.1, 3.0
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} ;
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int k ;
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puts ("\n Zero Order Hold interpolator:") ;
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for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
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stream_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;
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puts ("\n Linear interpolator:") ;
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for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
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stream_test (SRC_LINEAR, src_ratios [k]) ;
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puts ("\n Sinc interpolator:") ;
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for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
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stream_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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stream_test (int converter, double src_ratio)
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{ static float input [BUFFER_LEN], output [BUFFER_LEN] ;
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SRC_STATE *src_state ;
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SRC_DATA src_data ;
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int input_len, output_len, current_in, current_out ;
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int error, terminate ;
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printf ("\tstreaming_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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current_in = current_out = 0 ;
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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 = 0 ; /* Set this later. */
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src_data.data_in = input ;
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src_data.input_frames = BLOCK_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 = BLOCK_LEN ;
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while (1)
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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", src_data.output_frames) ;
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exit (1) ;
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} ;
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if (src_data.end_of_input && src_data.output_frames_gen == 0)
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break ;
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current_in += src_data.input_frames_used ;
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current_out += src_data.output_frames_gen ;
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src_data.data_in += src_data.input_frames_used ;
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src_data.data_out += src_data.output_frames_gen ;
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src_data.input_frames = MIN (BLOCK_LEN, input_len - current_in) ;
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src_data.output_frames = MIN (BLOCK_LEN, output_len - current_out) ;
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src_data.end_of_input = (current_in >= input_len) ? 1 : 0 ;
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} ;
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src_state = src_delete (src_state) ;
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terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;
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if (fabs (current_out - src_ratio * input_len) > 2 * terminate)
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{ printf ("\n\nLine %d : bad output data length %d should be %d.\n", __LINE__,
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current_out, (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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if (current_in != 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 : %d\n\n", current_in) ;
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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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} /* stream_test */
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