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ndisrc: Remove slope workaround in timestamping code

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This was needed for an old version of the NDI HX Camera iOS application
and is fixed since quite a while. Let's get rid of unnecessarily
complicated code.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1727>
This commit is contained in:
Sebastian Dröge 2024-08-19 15:16:31 +03:00 committed by GStreamer Marge Bot
parent 57821cade4
commit 0c4ec370cf
1 changed files with 31 additions and 124 deletions
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135
net/ndi/src/ndisrc/imp.rs
View file

@ -798,7 +798,6 @@ impl NdiSrc {
}
}
const PREFILL_WINDOW_LENGTH: usize = 12;
const WINDOW_LENGTH: u64 = 512;
const WINDOW_DURATION: u64 = 2_000_000_000;
@ -813,11 +812,6 @@ struct ObservationsInner {
skew: i64,
filling: bool,
window_size: usize,
// Remote/local times for workaround around fundamentally wrong slopes
// This is not reset below and has a bigger window.
times: VecDeque<(u64, u64)>,
slope_correction: (u64, u64),
}
impl Default for ObservationsInner {
@ -830,8 +824,6 @@ impl Default for ObservationsInner {
skew: 0,
filling: true,
window_size: 0,
times: VecDeque::new(),
slope_correction: (1, 1),
}
}
}
@ -867,33 +859,11 @@ impl Observations {
gst::trace!(
CAT,
obj = element,
"Local time {}, remote time {}, slope correct {}/{}",
"Local time {}, remote time {}",
local_time.nseconds(),
remote_time.nseconds(),
inner.slope_correction.0,
inner.slope_correction.1,
);
inner.times.push_back((remote_time, local_time));
while inner
.times
.back()
.unwrap()
.1
.saturating_sub(inner.times.front().unwrap().1)
> WINDOW_DURATION
{
let _ = inner.times.pop_front();
}
// Static remote times
if inner.slope_correction.1 == 0 {
return None;
}
let remote_time =
remote_time.mul_div_round(inner.slope_correction.0, inner.slope_correction.1)?;
let (base_remote_time, base_local_time) =
match (inner.base_remote_time, inner.base_local_time) {
(Some(remote), Some(local)) => (remote, local),
@ -912,110 +882,47 @@ impl Observations {
}
};
if inner.times.len() < PREFILL_WINDOW_LENGTH {
return Some((local_time.nseconds(), duration, false));
}
// Check if the slope is simply wrong and try correcting
{
let local_diff = inner
.times
.back()
.unwrap()
.1
.saturating_sub(inner.times.front().unwrap().1);
let remote_diff = inner
.times
.back()
.unwrap()
.0
.saturating_sub(inner.times.front().unwrap().0);
if remote_diff == 0 {
inner.reset();
inner.base_remote_time = Some(remote_time);
inner.base_local_time = Some(local_time);
// Static remote times
inner.slope_correction = (0, 0);
return None;
} else {
let remote_diff = remote_time.saturating_sub(base_remote_time);
let local_diff = local_time.saturating_sub(base_local_time);
let delta = (local_diff as i64) - (remote_diff as i64);
let slope = local_diff as f64 / remote_diff as f64;
let scaled_slope =
slope * (inner.slope_correction.1 as f64) / (inner.slope_correction.0 as f64);
// Check for some obviously wrong slopes and try to correct for that
if !(0.5..1.5).contains(&scaled_slope) {
gst::trace!(
CAT,
obj = element,
"Local diff {}, remote diff {}, delta {}, slope {}",
local_diff.nseconds(),
remote_diff.nseconds(),
delta,
slope,
);
if local_diff > gst::ClockTime::from_mseconds(500).nseconds()
&& !(0.5..1.5).contains(&slope)
{
gst::warning!(
CAT,
obj = element,
"Too small/big slope {}, resetting",
scaled_slope
slope
);
let discont = !inner.deltas.is_empty();
inner.reset();
if (0.0005..0.0015).contains(&slope) {
// Remote unit was actually 0.1ns
inner.slope_correction = (1, 1000);
} else if (0.005..0.015).contains(&slope) {
// Remote unit was actually 1ns
inner.slope_correction = (1, 100);
} else if (0.05..0.15).contains(&slope) {
// Remote unit was actually 10ns
inner.slope_correction = (1, 10);
} else if (5.0..15.0).contains(&slope) {
// Remote unit was actually 1us
inner.slope_correction = (10, 1);
} else if (50.0..150.0).contains(&slope) {
// Remote unit was actually 10us
inner.slope_correction = (100, 1);
} else if (50.0..150.0).contains(&slope) {
// Remote unit was actually 100us
inner.slope_correction = (1000, 1);
} else if (50.0..150.0).contains(&slope) {
// Remote unit was actually 1ms
inner.slope_correction = (10000, 1);
} else {
inner.slope_correction = (1, 1);
}
let remote_time = inner
.times
.back()
.unwrap()
.0
.mul_div_round(inner.slope_correction.0, inner.slope_correction.1)?;
gst::debug!(
CAT,
obj = element,
"Initializing base time: local {}, remote {}, slope correction {}/{}",
"Initializing base time: local {}, remote {}",
local_time.nseconds(),
remote_time.nseconds(),
inner.slope_correction.0,
inner.slope_correction.1,
);
inner.reset();
inner.base_remote_time = Some(remote_time);
inner.base_local_time = Some(local_time);
return Some((local_time.nseconds(), duration, discont));
}
}
}
let remote_diff = remote_time.saturating_sub(base_remote_time);
let local_diff = local_time.saturating_sub(base_local_time);
let delta = (local_diff as i64) - (remote_diff as i64);
gst::trace!(
CAT,
obj = element,
"Local diff {}, remote diff {}, delta {}",
local_diff.nseconds(),
remote_diff.nseconds(),
delta,
);
if (delta > inner.skew && delta - inner.skew > 1_000_000_000)
|| (delta < inner.skew && inner.skew - delta > 1_000_000_000)