initial commit

Signed-off-by: Sean Cross <sean@xobs.io>

src/main.c

@@ -0,0 +1,65 @@
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <time.h>
+#include <math.h>
+
+#include "bpsk.h"
+
+#define clear() printf("\033[H\033[J")
+#define gotoxy(x, y) printf("\033[%d;%dH", (y), (x))
+
+static uint8_t wave_header[44];
+
+int main(int argc, char **argv)
+{
+    char *wave_file_name = "modulated.wav";
+    struct stat statbuf;
+    int16_t *wave_buffer;
+
+    if (argc > 1)
+    {
+        wave_file_name = argv[1];
+    }
+
+    printf("Opening %s for demodulation...\n", wave_file_name);
+    int fd = open(wave_file_name, O_RDONLY);
+    if (fd == -1)
+    {
+        perror("unable to open wave file");
+        return 1;
+    }
+
+    if (-1 == fstat(fd, &statbuf))
+    {
+        perror("unable to determine size of buffer");
+        return 1;
+    }
+
+    // Read the .wav header (44 bytes) into the wave header array.
+    // This effectively discards it.
+    if (read(fd, wave_header, sizeof(wave_header)) != sizeof(wave_header))
+    {
+        fprintf(stderr, "couldn't read wave header");
+    }
+
+    // Allocate a buffer for the remainder of the wave file.
+    int wave_len_bytes = statbuf.st_size - sizeof(wave_header);
+    wave_buffer = malloc(wave_len_bytes);
+    if (read(fd, wave_buffer, wave_len_bytes) != wave_len_bytes)
+    {
+        fprintf(stderr, "short read of wave file\n");
+        return 1;
+    }
+
+    // Perform a BPSK run on it.
+    bpsk_init();
+    bpsk_run(wave_buffer, wave_len_bytes / sizeof(uint16_t));
+
+    printf("\n");
+    return 0;
+}