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livesync: Use the actual output buffer duration of gap filler buffers

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Otherwise the following can happen:

  - 25fps stream
  - buffer with PTS 0ms, duration 20ms arrives, is output
  - buffer with PTS 40ms, duration 20ms arrives
  - is considered early because 20ms < 40ms
  - filler buffer with PTS 20ms and 40ms duration is output
  - buffer with PTS 40ms is output

After this change no filler would be inserted because the gap is smaller
than the duration of a filler buffer.

Also, previously the 40ms duration would be used if a filler was
previously output because in that case the cached output buffer duration
would've already been patched from 20ms to 40ms.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1647>
This commit is contained in:
Sebastian Dröge 2024-07-02 17:15:58 +03:00
parent eee93aea52
commit bd2a039c8d
1 changed files with 7 additions and 3 deletions
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10
utils/livesync/src/livesync/imp.rs
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@ -1295,10 +1295,14 @@ impl LiveSync {
}; };
// When out_timestamp is set, we also have an out_buffer unless it is the first buffer // When out_timestamp is set, we also have an out_buffer unless it is the first buffer
let Some(ref out_buffer) = state.out_buffer else { if state.out_buffer.is_none() {
return false; return false;
}; }
let slack = out_buffer.duration().unwrap();
// Use the duration we would insert as a gap filler in patch_output_buffer()
let slack = state.out_duration.map_or(DEFAULT_DURATION, |dur| {
dur.clamp(MINIMUM_DURATION, MAXIMUM_DURATION)
});
if timestamp.start < out_timestamp.end + slack { if timestamp.start < out_timestamp.end + slack {
return false; return false;