kopia lustrzana https://github.com/F5OEO/rpitx
106 wiersze
2.8 KiB
C
106 wiersze
2.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <math.h>
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#include "ssb_gen.h"
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#include <sndfile.h>
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#define BUFFER_LEN 1024*8
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// Test program using SNDFILE
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// see http://www.mega-nerd.com/libsndfile/api.html for API
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int main(int argc, char **argv)
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{
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float data [2*BUFFER_LEN];
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float data_filtered[2*BUFFER_LEN]; // we generate complex I/Q samples
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SNDFILE *infile, *outfile;
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SF_INFO sfinfo;
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SF_INFO sf_out;
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int readcount, nb_samples;
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char *infilename;
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char *outfilename;
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int k;
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float x,I,Q;
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if( argc < 2 ) {
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printf("Usage : %s in.wav [out.wav]\n", argv[0]);
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return(1);
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}
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infilename = argv[1];
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if( argc == 3 ) {
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outfilename = argv[2];
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} else {
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outfilename = (char *)malloc( 128 );
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sprintf( outfilename, "%s", "out.wav");
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}
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if (! (infile = sf_open (infilename, SFM_READ, &sfinfo)))
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{
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/* Open failed so print an error message. */
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printf ("Not able to open input file %s.\n", infilename);
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/* Print the error message from libsndfile. */
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puts (sf_strerror (NULL));
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return 1;
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}
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if( sfinfo.samplerate != 48000 ) {
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printf("Input rate must be 48K.\n");
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return 1;
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}
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memcpy( (void *)&sf_out, (void *)&sfinfo, sizeof( SF_INFO ));
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sf_out.channels = 2;
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//sf_out.samplerate = sfinfo.samplerate/3;
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/* Open the output file. */
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if (! (outfile = sf_open (outfilename, SFM_WRITE, &sf_out)))
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{
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printf ("Not able to open output file %s.\n", outfilename);
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puts (sf_strerror (NULL));
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return 1;
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}
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/** **/
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printf ("Reading file : %s\n", infilename );
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printf ("Sample Rate : %d\n", sfinfo.samplerate);
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printf ("Channels : %d\n", sfinfo.channels);
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printf ("----------------------------------------\n");
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printf ("Writing file : %s\n", outfilename );
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printf ("Channels : %d\n", sf_out.channels);
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// la porteuse SSB est décalée de +1K
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ssb_init( 000 );
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/* While there are.frames in the input file, read them, process
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** them and write them to the output file.
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*/
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while ((readcount = sf_readf_float(infile, data, BUFFER_LEN)))
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{
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nb_samples = readcount / sfinfo.channels;
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for( k=0 ; k < nb_samples ; k++ ) {
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x = data[k*sfinfo.channels];
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if( sfinfo.channels == 2 ) {
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// stereo file, avg left + right
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x += data[k*sfinfo.channels+1];
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x /= 2;
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}
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// voir ssb_gen.h, mettre MODULE_SSB_LSB pour LSB module
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ssb( x, MODULE_SSB_USB , &I, &Q );
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data_filtered[2*k ] = I; //I and Q seems to be between 0 and 0.5
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data_filtered[2*k+1] = Q;
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/* // FOR COMPRESSOR *2
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data_filtered[2*k ] = I * 2; //I and Q seems to be between 0 and 0.5
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data_filtered[2*k+1] = Q * 2;
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*/
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}
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sf_write_float(outfile, data_filtered, 2*nb_samples );
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}
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/* Close input and output files. */
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sf_close (infile);
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sf_close (outfile);
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return 0;
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}
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