RTP timestamp doesn't wrap around on ARM CPU

[Dylan-Ying]

func TestEncoder(t *testing.T) {
	e := NewEncoder(90000, 12345)

	ts := e.Encode(0)
	require.Equal(t, uint32(12345), ts)

	e = NewEncoder(90000, 0xffffffff)
	ts = e.Encode(1000000000)
	require.Equal(t, uint32(89999), ts)
}

Test succeeds on x86 CPU, but fails on ARM CPU

--- FAIL: TestEncoder (0.00s)
encoder_test.go:18:
Error Trace: encoder_test.go:18
Error: Not equal:
expected: 0x15f8f
actual : 0xffffffff
Test: TestEncoder
FAIL

The reason seems to be that float64 to uint32 doesn't wrap around on ARM CPU
float64 to uint64 and then to uint32 can pass the test: uint32(uint64(float64(a)))

[aler9]

Thanks for reporting the issue, it has been fixed.

[github-actions]

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