// See reddit rtlsdr post "HDSDR for Linux wo/Borip" for info

#include <stdio.h>
#include <stdlib.h>

#define BLOCKSIZE 512
#define NBLOCKS 10000
#define BUFSIZE (BLOCKSIZE * NBLOCKS * 2)
#define SDR_SAMPLERATE 1024000

main(int argc,char* argv[] ) {

char c;
int i=0;
char * buffer;
FILE *fp;

struct headstruct {
  char      	riff[4];       
  int32_t   	chunksize;      
  char  	wave[4];        
  char  	fmt[4];         
  int32_t   	subchunksize;               
  int16_t 	format;     
  int16_t 	nchannels;      
  int32_t   	srate;          
  int32_t   	byteRate;  
  int16_t 	blockAlign; 
  int16_t 	nbits;  
  char  	data[4];        
  int32_t   	ndata;        
};

if (argc <=1) return;

struct headstruct iqhead = {"RIFF",BUFSIZE,"WAVE",
"fmt ",16,1,2,SDR_SAMPLERATE,SDR_SAMPLERATE*2,2,8,"data",BUFSIZE};

fp = fopen(argv[1],"w");
fwrite(&iqhead,sizeof(struct headstruct),1,fp);
buffer = (char*) malloc(BLOCKSIZE*2);
while( fread (buffer,2,BLOCKSIZE,stdin) > 0 ) {
      fwrite(buffer,2,BLOCKSIZE,fp);
      if (++i > NBLOCKS) {
          fseek(fp,44,SEEK_SET);
          i=0;
          }
      }
   fclose(fp);
}