83 lines
2.5 KiB
Rust
83 lines
2.5 KiB
Rust
use std::sync::{Mutex, OnceLock};
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use std::time::{Duration, Instant};
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fn capture_clock_origin() -> &'static Instant {
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static ORIGIN: OnceLock<Instant> = OnceLock::new();
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ORIGIN.get_or_init(Instant::now)
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}
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pub fn capture_pts_us() -> u64 {
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capture_clock_origin().elapsed().as_micros() as u64
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}
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pub fn upstream_timing_trace_enabled() -> bool {
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std::env::var("LESAVKA_UPSTREAM_TIMING_TRACE")
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.ok()
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.map(|value| {
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let trimmed = value.trim();
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!(trimmed.eq_ignore_ascii_case("0")
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|| trimmed.eq_ignore_ascii_case("false")
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|| trimmed.eq_ignore_ascii_case("no")
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|| trimmed.eq_ignore_ascii_case("off"))
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})
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.unwrap_or(false)
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}
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#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
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pub struct RebasedSourcePts {
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pub packet_pts_us: u64,
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pub capture_now_us: u64,
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pub source_pts_us: Option<u64>,
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pub source_base_us: Option<u64>,
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pub capture_base_us: Option<u64>,
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pub used_source_pts: bool,
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}
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#[derive(Debug, Default)]
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struct SourcePtsRebaserState {
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source_base_us: Option<u64>,
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capture_base_us: Option<u64>,
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last_packet_pts_us: Option<u64>,
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}
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#[derive(Debug, Default)]
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pub struct SourcePtsRebaser {
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state: Mutex<SourcePtsRebaserState>,
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}
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impl SourcePtsRebaser {
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pub fn rebase_or_now(&self, source_pts_us: Option<u64>, min_step_us: u64) -> RebasedSourcePts {
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let capture_now_us = capture_pts_us();
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let mut state = self
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.state
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.lock()
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.expect("source pts rebaser mutex poisoned");
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let mut packet_pts_us = capture_now_us;
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let mut used_source_pts = false;
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if let Some(source_pts_us) = source_pts_us {
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let source_base_us = *state.source_base_us.get_or_insert(source_pts_us);
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let capture_base_us = *state.capture_base_us.get_or_insert(capture_now_us);
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packet_pts_us =
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capture_base_us.saturating_add(source_pts_us.saturating_sub(source_base_us));
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used_source_pts = true;
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}
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if let Some(last_packet_pts_us) = state.last_packet_pts_us
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&& packet_pts_us <= last_packet_pts_us
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{
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packet_pts_us = last_packet_pts_us.saturating_add(min_step_us.max(1));
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}
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state.last_packet_pts_us = Some(packet_pts_us);
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RebasedSourcePts {
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packet_pts_us,
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capture_now_us,
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source_pts_us,
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source_base_us: state.source_base_us,
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capture_base_us: state.capture_base_us,
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used_source_pts,
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}
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}
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}
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