us.c

语音信号处理工具包,里面提供了很多有用的操作。这是最新版本

/*
  ----------------------------------------------------------------
	Speech Signal Processing Toolkit (SPTK): version 3.0
			 SPTK Working Group

		   Department of Computer Science
		   Nagoya Institute of Technology
				and
    Interdisciplinary Graduate School of Science and Engineering
		   Tokyo Institute of Technology
		      Copyright (c) 1984-2000
			All Rights Reserved.

  Permission is hereby granted, free of charge, to use and
  distribute this software and its documentation without
  restriction, including without limitation the rights to use,
  copy, modify, merge, publish, distribute, sublicense, and/or
  sell copies of this work, and to permit persons to whom this
  work is furnished to do so, subject to the following conditions:

    1. The code must retain the above copyright notice, this list
       of conditions and the following disclaimer.

    2. Any modifications must be clearly marked as such.

  NAGOYA INSTITUTE OF TECHNOLOGY, TOKYO INSITITUTE OF TECHNOLOGY,
  SPTK WORKING GROUP, AND THE CONTRIBUTORS TO THIS WORK DISCLAIM
  ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT
  SHALL NAGOYA INSTITUTE OF TECHNOLOGY, TOKYO INSITITUTE OF
  TECHNOLOGY, SPTK WORKING GROUP, NOR THE CONTRIBUTORS BE LIABLE
  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
  DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  PERFORMANCE OF THIS SOFTWARE.
 ----------------------------------------------------------------
*/

/************************************************************************
*                                                                       *
*    sampling rate conversion                                           *
*                                                                       *
*                                       1998.3  T.Kobayashi             *
*                                                                       *
*       usage:                                                          *
*               srcnv [ options ] infile  > stdout                      *
*       options:                                                        *
*               -s s  :  conversion type                          [58]  *
*               -c c  :  filename of low pass filter coef.   [Default]  *
*               -u u  :  upsampling ratio                          [1]  *
*               -d d  :  downsampling ratio                        [1]	*
*       infile:                                                         *
*               data sequence (float)                          [stdin]  *
*       notice:                                                         *
*                                                                       *
************************************************************************/

/* Standard C Libraries */
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

/* Default Value */
#define	RBSIZE		512
#define	DSIZE		512
#define	SIZE		256
#define LINEBUFSIZE	256
#define STYPE		"58"
#define	mod(x)	((x) & (RBSIZE -1))

#ifndef LIB
	#define LIB "/usr/local/SPTK/lib"
#endif

#define COEF23F	LIB "/lpfcoef.2to3f"
#define COEF23S	LIB "/lpfcoef.2to3s"
#define COEF34	LIB "/lpfcoef.3to4"
#define COEF45	LIB "/lpfcoef.4to5"
#define COEF57	LIB "/lpfcoef.5to7"
#define COEF58	LIB "/lpfcoef.5to8"

/* Command Name */
char		*cmnd, *coef = NULL, *type = STYPE;

void usage(int status)
{
	fprintf(stderr, "\n");
	fprintf(stderr, " %s - sampling rate convert\n\n",cmnd);
	fprintf(stderr, "  usage:\n");
	fprintf(stderr, "       %s [ options ] infile1 > stdout\n", cmnd);
	fprintf(stderr, "  options:\n");
	fprintf(stderr, "       -s s  : conversion type                           [%s]\n",STYPE);
	fprintf(stderr, "                23F up sampling by 2:3\n");
	fprintf(stderr, "                23S up sampling by 2:3\n");
	fprintf(stderr, "                34  up sampling by 3:4\n");
	fprintf(stderr, "                45  up sampling by 4:5\n");
	fprintf(stderr, "                57  up sampling by 5:7\n");
	fprintf(stderr, "                58  up sampling by 5:8\n");
	fprintf(stderr, "       -c c  : filename of low pass filter coefficients  [Default]\n");
	fprintf(stderr, "       -u u  : upsampling ratio                          [N/A]\n");
	fprintf(stderr, "       -d d  : downsampling ratio                        [N/A]\n");
	fprintf(stderr, "       -h    : print this message\n");
	fprintf(stderr, "  infile:\n");
	fprintf(stderr, "       data                                              [stdin]\n");
	fprintf(stderr, "  notice:\n");
	fprintf(stderr, "       Default LPF coefficients File\n");
	fprintf(stderr, "        2:3 -> %s\n", COEF23F);
	fprintf(stderr, "        2:3 -> %s\n", COEF23S);
	fprintf(stderr, "        3:4 -> %s\n", COEF34);
	fprintf(stderr, "        4:5 -> %s\n", COEF45);
	fprintf(stderr, "        5:7 -> %s\n", COEF57);
	fprintf(stderr, "        5:8 -> %s\n", COEF58);
	fprintf(stderr, "\n");
	exit(status);
}

static int	start = -1, u_rate=0, d_rate=0;

main(argc,argv)
int	argc;
char	*argv[];
{
	FILE	*fp, *fopen();
	char	*s, *infile = NULL, c;
	int	def_d_rate, def_u_rate;

	if ((cmnd = strrchr(argv[0], '/')) == NULL)
		cmnd = argv[0];
	else
		cmnd++;

	while(--argc) {
		if(*(s = *++argv) == '-') {
			c = *++s;
			if(*++s == '\0') {
				s = *++argv;
				--argc;
			}
			switch(c) {
			case 'c':
				coef = s;
				type = NULL;
				break;
			case 's':
				type = s;
				break;
			case 'u':
				u_rate = atoi(s);
				break;
			case 'd':
				d_rate = atoi(s);
				break;
			case 'h':
				usage(0);
			default:
				fprintf(stderr, "%s: Invalid option '%c'\n", cmnd, (*argv+1));
				usage(1);
			}
		}
		else
			infile = s;
	}
	if( type == NULL){
		;
	}
	else if( strcmp( type, "23F") == 0){
		coef = COEF23F;
		def_d_rate = 2;
		def_u_rate = 3;
	}
	else if( strcmp(type, "23S") == 0){
		coef = COEF23S;
		def_d_rate = 2;
		def_u_rate = 3;
	}
	else if( strcmp(type, "34") == 0){
		coef = COEF34;
		def_d_rate = 3;
		def_u_rate = 4;
	}
	else if( strcmp(type, "45") == 0){
		coef = COEF45;
		def_d_rate = 4;
		def_u_rate = 5;
	}
	else if( strcmp(type, "57") == 0){
		coef = COEF57;
		def_d_rate = 5;
		def_u_rate = 7;
	}
	else if( strcmp(type, "58") == 0){
		coef = COEF58;
		def_d_rate = 5;
		def_u_rate = 8;
	}
	else{
		fprintf(stderr, "%s: Invalid option '%s'\n", cmnd, type);
		usage(1);
	}
	
	if( d_rate == 0) d_rate = def_d_rate;
	if( u_rate == 0) u_rate = def_u_rate;

	if(coef == NULL) {
		fprintf(stderr, "%s: LPF-coef file not specified\n", cmnd);
		exit(1);
	}
	if(infile) {
		if((fp = fopen(infile, "r")) == NULL) {
			fprintf(stderr, "%s: cannot open %s\n", cmnd, infile);
			exit(1);
		}
	}
	else {
		fp = stdin;
	}
	srcnv(fp);
	fclose(fp);

	return(0);
}

srcnv(fp)
FILE	*fp;
{
	int	is_cont, i, k, nread, count, nwr, delay;
	float	x[SIZE], y[DSIZE];
	void	firin(), firinit();
	double	firout();

	firinit();
	delay = start;
	for(count = is_cont = 1; is_cont; ) {
		if((nread = fread(x, sizeof(*x), SIZE, fp)) == 0) {
			is_cont = 0;
			nread = (d_rate * start) / u_rate;
			for(k = 0; k < nread; ++k)
				x[k] = 0;
		}
		for(nwr = k = 0; k < nread; ++k) {
			firin(x[k]);
			for(i = 0; i < u_rate; ++i) {
				if(--count == 0) {
					y[nwr++] = firout(i);
					count = d_rate;
				}
			}
		}
		if(delay) {
			if(nwr > delay) {
				nwr -= delay;
				if(fwrite(y + delay, sizeof(*y), nwr, stdout) != nwr){
					fprintf(stderr, "%s: write error\n", cmnd);
					exit(1);
				}
				delay = 0;
			} else {
				delay -= nwr;
			}
		} else {
			if(fwrite(y, sizeof(*y), nwr, stdout) != nwr){
				fprintf(stderr, "%s: write error\n", cmnd);
				exit(1);
			}
		}
	}
}

static float	rb[RBSIZE], hdn[RBSIZE + 1];
static int	flengdn = -1, indx = 0;

void firin(in)
double	in;
{
	indx = mod(indx - 1);
	rb[indx] = in;
}

double firout(os)
int	os;
{
	double	out;
	int	k, l;

	out = 0;
	for(k = os, l = indx ; k <= flengdn; k += u_rate, l = mod(l + 1))
		out += rb[l] * hdn[k];

	return(out);
}

void firinit()
{
	FILE	*fp, *fopen();

	if((fp = fopen(coef, "r")) == NULL) {
		fprintf(stderr, "%s: cannot open %s\n", cmnd, coef);
		exit(1);
	}
	flengdn = freada(hdn, RBSIZE + 1, fp);
	fclose(fp);
	if(--flengdn < 0) {
		fprintf(stderr, "%s: cannot read filter coefficients\n", cmnd);
		exit(1);
	}
	if(start) {
		start = flengdn / (2 * d_rate);
	}
}

int freada( p, bl, fp)
float *p;
int bl;
FILE *fp;
{
	int c;
	char buf[LINEBUFSIZE];

	c = 0;
	while( c < bl ){
		if( fgets( buf, LINEBUFSIZE, fp) == NULL) break;
		p[c] = (float)atof( buf);
		c+=1;
	}
	return c;
}