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When the absolute timestamp of incoming frames was not available, it was filled with the current timestamp, which is influenced by latency over time. This mechanism is replaced by an algorithm that detects when latency is the lowest, stores the current timestamp and uses it as reference throughout the rest of the stream.
32 lines
1.1 KiB
Go
32 lines
1.1 KiB
Go
package ntpestimator
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import (
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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)
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func TestEstimator(t *testing.T) {
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e := &Estimator{ClockRate: 90000}
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timeNow = func() time.Time { return time.Date(2003, 11, 4, 23, 15, 7, 0, time.UTC) }
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ntp := e.Estimate(90000)
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require.Equal(t, time.Date(2003, 11, 4, 23, 15, 7, 0, time.UTC), ntp)
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timeNow = func() time.Time { return time.Date(2003, 11, 4, 23, 15, 8, 0, time.UTC) }
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ntp = e.Estimate(2 * 90000)
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require.Equal(t, time.Date(2003, 11, 4, 23, 15, 8, 0, time.UTC), ntp)
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timeNow = func() time.Time { return time.Date(2003, 11, 4, 23, 15, 10, 0, time.UTC) }
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ntp = e.Estimate(3 * 90000)
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require.Equal(t, time.Date(2003, 11, 4, 23, 15, 9, 0, time.UTC), ntp)
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timeNow = func() time.Time { return time.Date(2003, 11, 4, 23, 15, 9, 0, time.UTC) }
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ntp = e.Estimate(4 * 90000)
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require.Equal(t, time.Date(2003, 11, 4, 23, 15, 9, 0, time.UTC), ntp)
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timeNow = func() time.Time { return time.Date(2003, 11, 4, 23, 15, 15, 0, time.UTC) }
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ntp = e.Estimate(5 * 90000)
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require.Equal(t, time.Date(2003, 11, 4, 23, 15, 10, 0, time.UTC), ntp)
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}
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