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