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Add early stale-out in ANSRTSPClient::GetImage

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When the decoder hasn't produced a frame in 5s, skip the call to
_playerClient->getImage() entirely and return the cached frame with
unchanged _pts. LabVIEW sees STALE PTS one poll earlier and can
trigger reconnect sooner.

Threshold matches the existing checks on the duplicate-PTS branch and
in areImagesIdentical() so all three stale paths agree. Near-zero cost:
one getLastFrameAgeMs() call before the main path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Tuan Nghia Nguyen
2026-04-20 08:35:23 +10:00
parent 0925aa1d63
commit adf32da2a2
1 changed files with 19 additions and 0 deletions
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19
modules/ANSCV/ANSRTSP.cpp
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@@ -454,6 +454,25 @@ namespace ANSCENTER {
return _pLastFrame; // Shallow copy (fast)
}
// Early stale-out: if the decoder hasn't produced a frame in 5s the
// camera is dead. Skip _playerClient->getImage() entirely and return
// the cached frame with unchanged _pts so LabVIEW sees STALE PTS one
// poll earlier and triggers reconnect. Matches the 5000ms threshold
// already used on the duplicate-PTS branch below and in
// areImagesIdentical(), so all three stale paths agree.
if (!_pLastFrame.empty()) {
double ageMs = _playerClient->getLastFrameAgeMs();
if (ageMs >= 5000.0) {
ANS_DBG("RTSP_GetImage",
"EARLY STALE: ageMs=%.1f pts=%lld url=%s — skipping getImage()",
ageMs, (long long)_pts, _url.c_str());
width = _imageWidth;
height = _imageHeight;
pts = _pts;
return _pLastFrame;
}
}
int imageW = 0, imageH = 0;
int64_t currentPts = 0;