1 files changed, 0 insertions, 153 deletions
diff --git a/misc/tlininterp.c b/misc/tlininterp.c
deleted file mode 100644
index 7db6791..0000000
--- a/misc/tlininterp.c
+++ /dev/null
@@ -1,153 +0,0 @@
-/*
-   tlininterp.c
-   David Rowe
-   Jan 2017
-
-   Fast linear interpolator for high oversampling rates.  Upsample
-   with a decent filter first such that the signal is "low pass" wrt
-   to the input sample rate.
-
-   build: gcc tlininterp.c -o tlininterp -Wall -O2
-
-*/
-
-#include <assert.h>
-#include <getopt.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdint.h>
-
-#define NBUF         1000
-#define SIGNED_16BIT    0
-#define SIGNED_8BIT     1
-
-void display_help(void) {
-    fprintf(stderr, "\nusage: tlininterp inputRawFile OutputRawFile OverSampleRatio [-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 16 bit input, complex signed 8 bit output\n");
-    fprintf(stderr, "-f +Fs/4 freq shift\n\n");
-}
-
-int main(int argc, char *argv[]) {
-    FILE       *fin, *fout;
-    short       left[2], right[2], out[2*NBUF], i;
-    float       oversample, t;
-    int8_t      out_s8[2*NBUF];
-    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);
-
-    oversample = atof(argv[3]);
-    if (oversample <= 1) {
- 	display_help();
-	exit(1);
-    }
-       
-    int channels = 1;
-    int freq_shift = 0;
-    lo_i[0] = -1; lo_i[1] =  0;
-    lo_q[0] =  0; lo_q[1] = -1;
-    int format = SIGNED_16BIT;
-    int opt;
-    while ((opt = getopt(argc, argv, "cdf")) != -1) {
-        switch (opt) {
-        case 'c': channels = 2; break;
-        case 'd': channels = 2; format = SIGNED_8BIT; break;
-        case 'f': freq_shift = 1; break;
-        default:
-            display_help();
-            exit(1);
-        }
-    }
-
-    for (i=0; i<channels; i++)
-        left[i] = 0;
-    t = 0.0;
-    int j = 0;
-    while(fread(&right, sizeof(short)*channels, 1, fin) == 1) {
-        while (t < 1.0) {
-
-            for (i=0; i<channels; i++) {
-                out[2*j+i] = (1.0 - t)*left[i] + t*right[i];
-            }
-
-            if (freq_shift) {
-
-                /* update local osc recursion */
-
-                lo_i[2] = -lo_i[0]; lo_q[2] = -lo_q[0];
-                
-                /* complex mixer to up-shift complex samples */
-
-                int a = out[2*j];
-                int b = out[2*j+1];
-                int c = lo_i[2];
-                int d = lo_q[2];
-
-                out[2*j]   = a*c - b*d;
-                out[2*j+1] = b*c + a*d;
-
-                //fprintf(stderr, "% d % d % 5d % 5d\n", lo_i[2], lo_q[2], out[0], out[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]; 
-            }
-
-            /* once we have enough samples write to disk */
-
-            j++;
-            if (j == NBUF) {
-                if (format == SIGNED_16BIT) {
-                    fwrite(&out, sizeof(short)*channels, NBUF, fout);
-                } else {
-                    for (i=0; i<channels*NBUF; i++) {
-                        out_s8[i] = out[i] >> 8;
-                    }
-                    fwrite(&out_s8, sizeof(int8_t)*channels, NBUF, fout);
-                }
-                j = 0;
-            }
-
-            t += 1.0/oversample;
-        }
-        
-        t -= 1.0;
-        for (i=0; i<channels; i++)
-            left[i] = right[i];
-    }
-
-    /* write remaining samples to disk */
-
-    if (format == SIGNED_16BIT) {
-        fwrite(&out, sizeof(short), j, fout);
-    } else {
-        for (i=0; i<j; i++) {
-            out_s8[i] = out[i] >> 8;
-        }
-        fwrite(&out_s8, sizeof(int8_t)*channels, j, fout);
-    }
-
-    fclose(fout);
-    fclose(fin);
-
-    return 0;
-}