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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
static inline int compare_phase(float a, float b, float delta) {
if (fabs(a - b) < delta)
return 0;
a = fmod(a + M_PI, 2 * M_PI);
b = fmod(b + M_PI, 2 * M_PI);
// fprintf(stderr, "%f %f %f\n", a, b, delta);
if (fabs(a - b) < delta)
return 0;
return -1;
}
static inline int load_file(const char* name, size_t len, size_t offset, size_t bits, float* buf)
{
union {
char b[4];
int32_t i;
} sample;
int bytes_per_sample = 0;
size_t file_size, i;
FILE* file = fopen(name, "r");
if (!file)
return -1;
switch (bits) {
case 8:
bytes_per_sample = 1;
break;
case 24:
bytes_per_sample = 3;
break;
default:
fprintf(stderr, "Unsupported sample format\n");
return -1;
}
fseek(file, 0, SEEK_END);
file_size = ftell(file);
rewind(file);
if (file_size < (offset + len) * bytes_per_sample)
return -1;
if (fseek(file, offset * bytes_per_sample, SEEK_SET)) {
return -1;
}
memset(sample.b, 0, sizeof(sample.b)/sizeof(sample.b[0]));
i = 0;
char* p = sample.b + 4 - bytes_per_sample;
while ((fread(p, 1, bytes_per_sample, file) == bytes_per_sample) && i < len) {
buf[i] = (double)(sample.i) / (double)(1u<<31);
i++;
}
return 0;
}
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