Keep voice RTP timestamps aligned to 20 ms packets - #48824
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## Why Capture jitter and mute transitions can shift RTP timestamps off the 20 ms source grid, causing receivers that assemble fixed-duration frames to reject subsequent audio. ## What changed Advance elapsed gaps in whole 20 ms packets and keep the track clock on that grid. Bias empty gap durations by 1 ns to avoid losing an RTP tick to floating-point truncation. ## Testing Update jitter and mute tests to assert exact clock advancement, including a 580 ms gap, and verify that resumed RTP timestamps stay aligned to 960-sample packets. GitOrigin-RevId: 1511c739b77ee5871f72723fd34cb67aa9a48c95
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Keep voice RTP timestamps aligned to 20 ms packets
Why
Capture jitter and mute transitions can shift RTP timestamps off the 20 ms source grid, causing receivers that assemble fixed-duration frames to reject subsequent audio.
What changed
Advance elapsed gaps in whole 20 ms packets and keep the track clock on that grid. Bias empty gap durations by 1 ns to avoid losing an RTP tick to floating-point truncation.
Testing
Update jitter and mute tests to assert exact clock advancement, including a 580 ms gap, and verify that resumed RTP timestamps stay aligned to 960-sample packets.