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/* utility to check a recorded WAV file in fgpa.test_mode=1 for
* discontinuities in the counter increment/decrements */
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#define STEP 1
static int check_continuity(uint16_t *samples, uint32_t size)
{
uint16_t *end = samples + size/sizeof(uint16_t);
uint16_t *cur;
int inited = 0;
uint16_t last_i, last_q;
for (cur = samples; cur < end; cur += 2) {
if (!inited) {
last_i = cur[0];
last_q = cur[1];
printf("initial I=%04x, Q=%04x\n",
last_i, last_q);
inited = 1;
continue;
}
if (cur[0] != (uint16_t)(last_i - STEP) ||
cur[1] != (uint16_t)(last_q + STEP)) {
fprintf(stderr, "Disocntinuity at %u: "
"I=%04x/%04x Q=%04x/%04x\n",
cur - samples, last_i, cur[0],
last_q, cur[1]);
}
last_i = cur[0];
last_q = cur[1];
}
return 0;
}
int main(int argc, char **argv)
{
struct stat st;
int fd;
void *map;
uint16_t *samples;
if (argc < 2) {
fprintf(stderr, "You have to specify a wave file name\n");
exit(2);
}
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("opening file");
exit(2);
}
if (fstat(fd, &st) < 0) {
perror("stat");
exit(1);
}
map = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (!map) {
perror("mmap");
exit(1);
}
if (memcmp(map, "RIFF", 4)) {
fprintf(stderr, "Doeesn't look like a WAV file\n");
exit(1);
}
samples = (uint16_t *)(map + 0x44);
check_continuity(samples, st.st_size-0x44);
exit(0);
}
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