kopia lustrzana https://github.com/F5OEO/rpitx
116 wiersze
2.7 KiB
C
116 wiersze
2.7 KiB
C
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdarg.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <math.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <signal.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
|
||
|
|
|
||
|
|
#include <sndfile.h>
|
||
|
|
|
||
|
|
#define BUFFER_LEN 1024*8
|
||
|
|
int FileFreqTiming;
|
||
|
|
// Test program using SNDFILE
|
||
|
|
// see http://www.mega-nerd.com/libsndfile/api.html for API
|
||
|
|
void WriteTone(double Frequency,uint32_t Timing)
|
||
|
|
{
|
||
|
|
typedef struct {
|
||
|
|
double Frequency;
|
||
|
|
uint32_t WaitForThisSample;
|
||
|
|
} samplerf_t;
|
||
|
|
samplerf_t RfSample;
|
||
|
|
|
||
|
|
|
||
|
|
RfSample.Frequency=Frequency;
|
||
|
|
RfSample.WaitForThisSample=Timing; //en 100 de nanosecond
|
||
|
|
//printf("Freq =%f Timing=%d\n",RfSample.Frequency,RfSample.WaitForThisSample);
|
||
|
|
write(FileFreqTiming,&RfSample,sizeof(samplerf_t));
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv) {
|
||
|
|
float data [2*BUFFER_LEN] ;
|
||
|
|
float data_filtered[2*BUFFER_LEN] ; // we generate complex I/Q samples
|
||
|
|
SNDFILE *infile, *outfile ;
|
||
|
|
SF_INFO sfinfo ;
|
||
|
|
|
||
|
|
int readcount, nb_samples ;
|
||
|
|
char *infilename ;
|
||
|
|
char *outfilename ;
|
||
|
|
int k ;
|
||
|
|
float x ;
|
||
|
|
|
||
|
|
if( argc < 2 ) {
|
||
|
|
printf("Usage : %s in.wav [out.wav]\n", argv[0]);
|
||
|
|
return(1);
|
||
|
|
}
|
||
|
|
infilename = argv[1] ;
|
||
|
|
if( argc == 3 ) {
|
||
|
|
outfilename = argv[2] ;
|
||
|
|
} else {
|
||
|
|
outfilename = (char *)malloc( 128 );
|
||
|
|
sprintf( outfilename, "%s", "out.ft");
|
||
|
|
}
|
||
|
|
if (! (infile = sf_open (infilename, SFM_READ, &sfinfo)))
|
||
|
|
{ /* Open failed so print an error message. */
|
||
|
|
printf ("Not able to open input file %s.\n", infilename) ;
|
||
|
|
/* Print the error message from libsndfile. */
|
||
|
|
puts (sf_strerror (NULL)) ;
|
||
|
|
return 1 ;
|
||
|
|
} ;
|
||
|
|
|
||
|
|
if( sfinfo.samplerate != 48000 ) {
|
||
|
|
printf("Input rate must be 48K.\n");
|
||
|
|
return 1 ;
|
||
|
|
}
|
||
|
|
|
||
|
|
FileFreqTiming = open(outfilename,'r');
|
||
|
|
|
||
|
|
|
||
|
|
/** **/
|
||
|
|
printf ("Reading file : %s\n", infilename ) ;
|
||
|
|
printf ("Sample Rate : %d\n", sfinfo.samplerate) ;
|
||
|
|
printf ("Channels : %d\n", sfinfo.channels) ;
|
||
|
|
printf ("----------------------------------------\n") ;
|
||
|
|
printf ("Writing file : %s\n", outfilename ) ;
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* While there are.frames in the input file, read them, process
|
||
|
|
** them and write them to the output file.
|
||
|
|
*/
|
||
|
|
int Excursion=12500;
|
||
|
|
while ((readcount = sf_readf_float(infile, data, BUFFER_LEN)))
|
||
|
|
{
|
||
|
|
nb_samples = readcount / sfinfo.channels ;
|
||
|
|
for( k=0 ; k < nb_samples ; k++ ) {
|
||
|
|
x = data[k*sfinfo.channels] ;
|
||
|
|
if( sfinfo.channels == 2 ) {
|
||
|
|
// stereo file, avg left + right
|
||
|
|
x += data[k*sfinfo.channels+1] ;
|
||
|
|
x /= 2 ;
|
||
|
|
}
|
||
|
|
//printf("%f \n",x);
|
||
|
|
WriteTone(x*Excursion*2.0,1e9/48000.0);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
} ;
|
||
|
|
|
||
|
|
/* Close input and output files. */
|
||
|
|
sf_close (infile) ;
|
||
|
|
close(FileFreqTiming);
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|