TEST(audio_utils_primitives, clamp_to_int) {
static const float testArray[] = {
-NAN, -INFINITY,
-1.e20, -32768., 63.9,
-3.5, -3.4, -2.5, 2.4, -1.5, -1.4, -0.5, -0.2, 0., 0.2, 0.5, 0.8,
1.4, 1.5, 1.8, 2.4, 2.5, 2.6, 3.4, 3.5,
32767., 32768., 1.e20,
INFINITY, NAN };
for (size_t i = 0; i < ARRAY_SIZE(testArray); ++i) {
testClamp16(testArray[i]);
}
for (size_t i = 0; i < ARRAY_SIZE(testArray); ++i) {
testClamp24(testArray[i]);
}
// used for ULP testing (tweaking the lsb of the float)
union {
int32_t i;
float f;
} val;
int32_t res;
// check clampq4_27_from_float()
val.f = 16.;
res = clampq4_27_from_float(val.f);
EXPECT_EQ(res, 0x7fffffff);
val.i--;
res = clampq4_27_from_float(val.f);
EXPECT_LE(res, 0x7fffffff);
EXPECT_GE(res, 0x7fff0000);
val.f = -16.;
res = clampq4_27_from_float(val.f);
EXPECT_EQ(res, (int32_t)0x80000000); // negative
val.i++;
res = clampq4_27_from_float(val.f);
EXPECT_GE(res, (int32_t)0x80000000); // negative
EXPECT_LE(res, (int32_t)0x80008000); // negative
// check u4_28_from_float and u4_12_from_float
uint32_t ures;
uint16_t ures16;
val.f = 16.;
ures = u4_28_from_float(val.f);
EXPECT_EQ(ures, 0xffffffff);
ures16 = u4_12_from_float(val.f);
EXPECT_EQ(ures16, 0xffff);
val.f = -1.;
ures = u4_28_from_float(val.f);
EXPECT_EQ(ures, 0);
ures16 = u4_12_from_float(val.f);
EXPECT_EQ(ures16, 0);
// check float_from_u4_28 and float_from_u4_12 (roundtrip)
for (uint32_t v = 0x100000; v <= 0xff000000; v += 0x100000) {
ures = u4_28_from_float(float_from_u4_28(v));
EXPECT_EQ(ures, v);
}
for (uint32_t v = 0; v <= 0xffff; ++v) { // uint32_t prevents overflow
ures16 = u4_12_from_float(float_from_u4_12(v));
EXPECT_EQ(ures16, v);
}
}
void memcpy_to_q4_27_from_float(int32_t *dst, const float *src, size_t count)
{
while (count--) {
*dst++ = clampq4_27_from_float(*src++);
}
}