namandClaude Opus 5.5
f8d0e6fc36
Padding/probe packets use a sequence number but carry no audio. They were treated as lost, so each one played an invented 20 ms frame (a glitch) and pushed the buffer a frame deeper for drift correction to remove again. Signature in the first live test: lost ~= drift-drops (74 vs 72 per minute). They are now skipped and counted as 'padding'. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
package main
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import (
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"fmt"
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"math"
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"testing"
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"github.com/pion/rtp"
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"gopkg.in/hraban/opus.v2"
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)
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func TestPadding(t *testing.T) {
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for _, name := range []string{"empty payload", "other payload type"} {
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enc, _ := opus.NewEncoder(rate, channels, opus.AppAudio)
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dec, _ := opus.NewDecoder(rate, channels)
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jb := newJitterBuffer(dec, 111)
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pcm := make([]int16, frameSamps*channels)
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buf := make([]byte, 4000)
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seq, ts := uint16(0), 0.0
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frames := 0
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// 10 minutes of playout; audio packet every 20 ms, plus a padding packet every 40 seqs.
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for tms := 0.0; tms < 600000; tms += 20 {
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for ts <= tms {
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if seq%40 == 39 {
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p := &rtp.Packet{Header: rtp.Header{SequenceNumber: seq, PayloadType: 111}}
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if name != "empty payload" {
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p.PayloadType, p.Payload = 13, []byte{0x40}
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}
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jb.push(p)
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seq++
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continue
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}
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for k := range pcm { pcm[k] = int16(6000 * math.Sin(float64(frames*frameSamps+k/2)*2*math.Pi*220/rate)) }
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n, _ := enc.Encode(pcm, buf)
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jb.push(&rtp.Packet{Header: rtp.Header{SequenceNumber: seq, PayloadType: 111}, Payload: append([]byte(nil), buf[:n]...)})
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seq++; frames++; ts += 20
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}
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jb.next()
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}
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c, d, tg := jb.snapshot()
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fmt.Printf("%-20s padding=%d lost=%d fec=%d concealed=%d drift-drops=%d inserted=%d underruns=%d buffer=%d/%dms\n", name, c.Padding, c.Lost, c.FEC, c.PLC, c.Dropped, c.Inserted, c.Underruns, d, tg)
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if c.Lost+c.PLC+c.Dropped+c.Underruns != 0 { t.Errorf("%s: padding still causes damage", name) }
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}
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}
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