1 files changed, 0 insertions, 141 deletions
diff --git a/misc/tdec.c b/misc/tdec.c
deleted file mode 100644
index 501edc6..0000000
--- a/misc/tdec.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
-   tdec.c
-   David Rowe
-   Jan 2017
-
-   Trivial non filtered decimator for high ration sample rate conversion.
-
-   build: gcc tdec.c -o tdec -Wall -O2
-
-*/
-
-#include <assert.h>
-#include <getopt.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdint.h>
-
-#define SIGNED_16BIT   0
-#define SIGNED_8BIT    1
-#define UNSIGNED_8BIT  2
-
-void freq_shift_complex_buf(short buf[], int n, int lo_i[], int lo_q[]);
-
-void display_help(void) {
-    fprintf(stderr, "\nusage: tdec inputRawFile OutputRawFile DecimationRatio [-c]\n");
-    fprintf(stderr, "\nUse - for stdin/stdout\n\n");
-    fprintf(stderr, "-c complex signed 16 bit input and output\n");
-    fprintf(stderr, "-d complex signed 8 bit input (e.g. HackRF), complex signed 16 bit output\n");
-    fprintf(stderr, "-e complex unsigned 8 bit input (e.g. RTL-SDR), complex signed 16 bit output\n");
-    fprintf(stderr, "-f -Fs/4 freq shift\n\n");
-}
-
-int main(int argc, char *argv[]) {
-    FILE       *fin, *fout;
-    short       dec;
-    int         lo_i[3], lo_q[3];
-
-    if (argc < 3) {
-	display_help();
-	exit(1);
-    }
-
-    if (strcmp(argv[1], "-") == 0) 
-        fin = stdin;
-    else
-        fin = fopen(argv[1], "rb");
-    assert(fin != NULL);
-
-    if (strcmp(argv[2], "-") == 0) 
-        fout = stdout;
-    else
-        fout = fopen(argv[2], "wb");
-    assert(fout != NULL);
-
-    dec = atoi(argv[3]);
-
-    int channels = 1;
-    int freq_shift = 0;
-    lo_i[0] = -1; lo_i[1] =  0;
-    lo_q[0] =  0; lo_q[1] = -1;
-    int opt;
-    int format = SIGNED_16BIT;
-    while ((opt = getopt(argc, argv, "cdef")) != -1) {
-        switch (opt) {
-        case 'c': channels = 2; break;
-        case 'd': channels = 2; format = SIGNED_8BIT; break;
-        case 'e': channels = 2; format = UNSIGNED_8BIT; break;
-        case 'f': freq_shift = 1; break;
-        default:
-            display_help();
-            exit(1);
-        }
-    }
-
-    if (format == SIGNED_16BIT) {
-        short buf[dec*channels];
-        while(fread(buf, sizeof(short)*channels, dec, fin) == dec) {
-            if (freq_shift)            
-                freq_shift_complex_buf(buf, dec*channels, lo_i, lo_q);
-            fwrite(buf, sizeof(short), channels, fout);
-        }
-    }
-    else {
-        uint8_t inbuf[dec*channels];
-        short   outbuf[dec*channels];
-        short   sam, i;
-        
-        while(fread(inbuf, sizeof(uint8_t)*channels, dec, fin) == dec) {
-            for (i=0; i<dec*channels; i++) {
-                assert((format == SIGNED_8BIT) || (format == UNSIGNED_8BIT));
-                if (format == SIGNED_8BIT) {
-                    sam = (short)inbuf[i];
-                    sam <<= 8;
-                } else {
-                    sam = (short)inbuf[i] - 127;
-                    sam <<= 8;
-                }
-                outbuf[i] = sam;
-            }
-            if (freq_shift)
-                freq_shift_complex_buf(outbuf, dec*channels, lo_i, lo_q);
-            fwrite(outbuf, sizeof(short), channels, fout);
-        }
-
-    }
-
-    fclose(fout);
-    fclose(fin);
-
-    return 0;
-}
-                
-
-void freq_shift_complex_buf(short buf[], int n, int lo_i[], int lo_q[]) {
-    int i;
-
-    for (i=0; i<n; i+=2) {
-        /* update local osc recursion */
-
-        lo_i[2] = -lo_i[0]; lo_q[2] = -lo_q[0];
-
-        /* freq shift down input samples */
-
-        int a = buf[i];
-        int b = buf[i+1];
-        int c = lo_i[2];
-        int d = -lo_q[2];  /* conj LO as down shift */
-
-        buf[i]   = a*c - b*d;
-        buf[i+1] = b*c + a*d;
-
-        //fprintf(stderr, "% d % d % 5d % 5d\n", lo_i[2], lo_q[2], buf[i], buf[i+1]);
-
-        /* update LO memory */
-
-        lo_i[0] = lo_i[1]; lo_i[1] = lo_i[2]; 
-        lo_q[0] = lo_q[1]; lo_q[1] = lo_q[2]; 
-    }
-}
-