simple_test.c

该程序用于采样频率的转化

/*
** Copyright (C) 2002-2004 Erik de Castro Lopo <[e-mail]>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "samplerate.h"
#include "util.h"

#define	BUFFER_LEN		5200

FILE *finput ,*foutput;

static void simple_test (int converter, double ratio) ;

int main(void)
{	
	static double src_ratios [] =
	{1.0001, 0.099, 0.1,0.33333333, 0.789, 1.9, 3.1, 9.9
	} ;

    int k ;

	/* Force output of the Electric Fence banner message. */
	//force_efence_banner () ;

	puts ("") ;

/*	puts ("    Zero Order Hold interpolator :") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		simple_test (SRC_ZERO_ORDER_HOLD, src_ratios [k]) ;

	puts ("    Linear interpolator :") ;
	for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)
		simple_test (SRC_LINEAR, src_ratios [k]) ;*/
	
	finput = fopen("c:\\src_test_data\\stereodata_mp3.bin","r");
    foutput = fopen("c:\\src_test_data\\madoutput.dat","wt");

	puts (" Sinc interpolator :") ;
	/*for (k = 0 ; k < ARRAY_LEN (src_ratios) ; k++)*/
	k = 0;

	simple_test (SRC_SINC_FASTEST, src_ratios[k]);

	puts ("") ;

	return 0 ;
} /* main */

 short data_in[BUFFER_LEN],data_out[BUFFER_LEN];
 static float  input[BUFFER_LEN], output[BUFFER_LEN];

SRC_DATA src_data;
int input_len, output_len, error, terminate ;
static void
simple_test (int converter, double src_ratio)
{	//static float  input[BUFFER_LEN], output[BUFFER_LEN];

	//SRC_DATA	src_data ;

//int input_len, output_len, error, terminate ;

    short *pin_data = data_in, *pout_data = data_out ;
    
	printf ("\tsimple_test      (SRC ratio = %6.4f) ........... ", src_ratio) ;

	fflush (stdout) ; 

	/* Calculate maximun input and output lengths. */
	if (src_ratio >= 1.0)
	{	output_len = BUFFER_LEN ;
		input_len = (int) floor (BUFFER_LEN / src_ratio) ;
		}
	else
	{	input_len = BUFFER_LEN ;
		output_len = (int) floor (BUFFER_LEN * src_ratio) ;
		} ;

	/* Reduce input_len by 10 so output is longer than necessary. */
	input_len -= 10 ;

	if (output_len > BUFFER_LEN)
	{	printf ("\n\nLine %d : output_len > BUFFER_LEN\n\n", __LINE__) ;
		exit (1) ;
		} ;

	memset (&src_data, 0, sizeof (src_data)) ;

	src_data.data_in = input ;

	src_data.input_frames = input_len ;

	src_data.src_ratio = src_ratio ;

	src_data.data_out = output ;

	src_data.output_frames = BUFFER_LEN ;

    fread(pin_data,sizeof(short),BUFFER_LEN,finput);/*****data input********/

	src_short_to_float_array(pin_data,input,BUFFER_LEN);
	
	if ((error = src_simple (&src_data, converter, 1)))
	{	printf ("\n\nLine %d : %s\n\n", __LINE__, src_strerror (error)) ;
		exit (1) ;
		} ;

	terminate = (int) ceil ((src_ratio >= 1.0) ? src_ratio : 1.0 / src_ratio) ;

	if (fabs (src_data.output_frames_gen - src_ratio * input_len) > 2 * terminate)
	{	printf ("\n\nLine %d : bad output data length %ld should be %d.\n", __LINE__,
					src_data.output_frames_gen, (int) floor (src_ratio * input_len)) ;
		printf ("\tsrc_ratio  : %.4f\n", src_ratio) ;
		printf ("\tinput_len  : %d\n\toutput_len : %d\n\n", input_len, output_len);
		exit (1);
		};
    src_float_to_short_array(output,data_out,output_len); /*********data output***********/ 
	
    fwrite(output, sizeof(float),output_len,foutput);

	puts ("ok") ;

	return ;
} /* simple_test */

/*
** Do not edit or modify anything in this comment block.
** The arch-tag line is a file identity tag for the GNU Arch 
** revision control system.
** arch-tag: d60f8f5f-154b-4541-958e-e1062140e085
*/