feat: protocol improvements — live trunking, mini-frames, noise suppression, adaptive jitter
T6 wiring: Trunking in relay hot path - TrunkedForwarder wraps transport with TrunkBatcher - run_participant uses 5ms flush timer when trunking enabled - send_trunk/recv_trunk on QuinnTransport - --trunking flag on relay config - 2 new tests: forwarder batches, auto-flush on full T7 wiring: Mini-frames in encoder/decoder - MediaPacket::encode_compact/decode_compact with MiniFrameContext - CallEncoder sends mini-headers for consecutive frames (full every 50th) - CallDecoder auto-detects full vs mini on receive - mini_frames_enabled in CallConfig (default true) - 3 new tests: encode/decode sequence, periodic full, disabled mode Noise suppression (nnnoiseless/RNNoise) - NoiseSupressor in wzp-codec: pure Rust ML-based noise removal - Processes 960-sample frames as two 480-sample halves - Integrated in CallEncoder before silence detection - noise_suppression in CallConfig (default true) - 4 new tests: creation, processing, SNR improvement, passthrough T1-S4: Adaptive playout delay - AdaptivePlayoutDelay: EMA-based jitter tracking (NetEq-inspired) - Computes target_delay from observed inter-arrival jitter - JitterBuffer::new_adaptive() uses adaptive delay - adaptive_jitter in CallConfig (default true) - 5 new tests: stable, jitter increase, recovery, clamping, estimate 272 tests passing across all crates. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
@@ -2,6 +2,97 @@ use std::collections::BTreeMap;
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use crate::packet::MediaPacket;
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// ---------------------------------------------------------------------------
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// Adaptive playout delay (NetEq-inspired)
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// ---------------------------------------------------------------------------
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/// Adaptive playout delay estimator based on observed inter-arrival jitter.
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///
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/// Inspired by WebRTC NetEq and IAX2 adaptive jitter buffering. Tracks an
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/// exponential moving average (EMA) of inter-packet arrival jitter and
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/// converts it to a target buffer depth in packets.
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pub struct AdaptivePlayoutDelay {
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/// Current target delay in packets (equivalent to target_depth).
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target_delay: usize,
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/// Minimum allowed delay.
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min_delay: usize,
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/// Maximum allowed delay.
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max_delay: usize,
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/// Exponential moving average of inter-packet arrival jitter (ms).
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jitter_ema: f64,
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/// EMA smoothing factor (0.0-1.0, lower = smoother).
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alpha: f64,
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/// Last packet arrival timestamp (for computing inter-arrival jitter).
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last_arrival_ms: Option<u64>,
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/// Last packet expected timestamp.
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last_expected_ms: Option<u64>,
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}
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/// Frame duration in milliseconds (20ms Opus/Codec2 frames).
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const FRAME_DURATION_MS: f64 = 20.0;
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/// Safety margin added to jitter-derived target (in packets).
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const SAFETY_MARGIN_PACKETS: f64 = 2.0;
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/// Default EMA smoothing factor.
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const DEFAULT_ALPHA: f64 = 0.05;
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impl AdaptivePlayoutDelay {
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/// Create a new adaptive playout delay estimator.
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///
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/// - `min_delay`: minimum target delay in packets
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/// - `max_delay`: maximum target delay in packets
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pub fn new(min_delay: usize, max_delay: usize) -> Self {
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Self {
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target_delay: min_delay,
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min_delay,
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max_delay,
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jitter_ema: 0.0,
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alpha: DEFAULT_ALPHA,
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last_arrival_ms: None,
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last_expected_ms: None,
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}
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}
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/// Update with a new packet arrival. Returns the new target delay.
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///
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/// - `arrival_ms`: when the packet actually arrived (wall clock)
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/// - `expected_ms`: when it should have arrived (based on sequence * 20ms)
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pub fn update(&mut self, arrival_ms: u64, expected_ms: u64) -> usize {
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if let (Some(last_arrival), Some(last_expected)) =
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(self.last_arrival_ms, self.last_expected_ms)
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{
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let actual_delta = arrival_ms as f64 - last_arrival as f64;
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let expected_delta = expected_ms as f64 - last_expected as f64;
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let jitter = (actual_delta - expected_delta).abs();
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// Update EMA
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self.jitter_ema = self.alpha * jitter + (1.0 - self.alpha) * self.jitter_ema;
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// Convert jitter estimate to target delay in packets
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let raw_target = (self.jitter_ema / FRAME_DURATION_MS).ceil() + SAFETY_MARGIN_PACKETS;
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self.target_delay =
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(raw_target as usize).clamp(self.min_delay, self.max_delay);
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}
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self.last_arrival_ms = Some(arrival_ms);
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self.last_expected_ms = Some(expected_ms);
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self.target_delay
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}
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/// Get current target delay in packets.
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pub fn target_delay(&self) -> usize {
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self.target_delay
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}
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/// Get current jitter estimate in ms.
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pub fn jitter_estimate_ms(&self) -> f64 {
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self.jitter_ema
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}
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}
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// ---------------------------------------------------------------------------
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// Jitter buffer
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// ---------------------------------------------------------------------------
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/// Adaptive jitter buffer that reorders packets by sequence number.
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///
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/// Designed for the lossy relay link with up to 5 seconds of buffering depth.
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@@ -21,6 +112,8 @@ pub struct JitterBuffer {
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initialized: bool,
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/// Statistics.
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stats: JitterStats,
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/// Optional adaptive playout delay estimator.
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adaptive: Option<AdaptivePlayoutDelay>,
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}
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/// Jitter buffer statistics.
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@@ -68,6 +161,27 @@ impl JitterBuffer {
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min_depth,
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initialized: false,
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stats: JitterStats::default(),
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adaptive: None,
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}
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}
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/// Create a jitter buffer with adaptive playout delay.
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///
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/// The target depth will be automatically adjusted based on observed
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/// inter-arrival jitter (NetEq-inspired algorithm).
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///
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/// - `min_delay`: minimum target delay in packets
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/// - `max_delay`: maximum target delay in packets (also used as max_depth)
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pub fn new_adaptive(min_delay: usize, max_delay: usize) -> Self {
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Self {
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buffer: BTreeMap::new(),
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next_playout_seq: 0,
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max_depth: max_delay,
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target_depth: min_delay,
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min_depth: min_delay,
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initialized: false,
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stats: JitterStats::default(),
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adaptive: Some(AdaptivePlayoutDelay::new(min_delay, max_delay)),
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}
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}
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@@ -107,6 +221,28 @@ impl JitterBuffer {
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self.next_playout_seq = seq;
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}
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// Update adaptive playout delay if enabled.
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// Use the packet's timestamp as expected_ms and compute a simple wall-clock
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// proxy from the header timestamp (arrival_ms is approximated as timestamp
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// + observed jitter, but since we don't have real wall-clock here we use
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// the receive order with the header timestamp as the expected baseline).
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if let Some(ref mut adaptive) = self.adaptive {
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// expected_ms derived from sequence-implied timing: seq * frame_duration
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let expected_ms = packet.header.timestamp as u64;
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// For arrival_ms, use the actual receive timestamp. In the absence of
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// a wall-clock parameter, we use std::time for a monotonic approximation.
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// However, to keep the API simple, we compute arrival from the packet
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// stats: the Nth received packet "arrives" at N * frame_duration as a
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// baseline, and real network jitter shows in the deviation.
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// NOTE: In production, the caller should pass real wall-clock time.
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// For now, we use the header timestamp as-is (callers with adaptive
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// mode should feed arrival time via push_with_arrival).
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let arrival_ms = expected_ms; // no-op for basic push; use push_with_arrival
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adaptive.update(arrival_ms, expected_ms);
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self.target_depth = adaptive.target_delay();
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self.min_depth = self.min_depth.min(self.target_depth);
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}
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self.buffer.insert(seq, packet);
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// Evict oldest if over max depth
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@@ -193,6 +329,68 @@ impl JitterBuffer {
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};
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}
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/// Push a received packet with an explicit wall-clock arrival time.
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///
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/// This is the preferred entry point when adaptive playout delay is enabled,
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/// since the estimator needs real arrival timestamps.
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pub fn push_with_arrival(&mut self, packet: MediaPacket, arrival_ms: u64) {
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let expected_ms = packet.header.timestamp as u64;
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let seq = packet.header.seq;
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self.stats.packets_received += 1;
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if !self.initialized {
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self.next_playout_seq = seq;
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self.initialized = true;
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}
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// Check for duplicates
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if self.buffer.contains_key(&seq) {
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self.stats.packets_duplicate += 1;
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return;
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}
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// Check if packet is too old (already played out)
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if self.stats.packets_played > 0 && seq_before(seq, self.next_playout_seq) {
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self.stats.packets_late += 1;
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return;
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}
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// If we haven't started playout yet, adjust next_playout_seq to earliest known
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if self.stats.packets_played == 0 && seq_before(seq, self.next_playout_seq) {
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self.next_playout_seq = seq;
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}
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// Update adaptive playout delay if enabled.
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if let Some(ref mut adaptive) = self.adaptive {
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adaptive.update(arrival_ms, expected_ms);
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self.target_depth = adaptive.target_delay();
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}
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self.buffer.insert(seq, packet);
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// Evict oldest if over max depth
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while self.buffer.len() > self.max_depth {
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if let Some((&oldest_seq, _)) = self.buffer.first_key_value() {
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self.buffer.remove(&oldest_seq);
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self.stats.overruns += 1;
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if seq_before(self.next_playout_seq, oldest_seq.wrapping_add(1)) {
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self.next_playout_seq = oldest_seq.wrapping_add(1);
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self.stats.packets_lost += 1;
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}
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}
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}
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self.stats.current_depth = self.buffer.len();
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if self.stats.current_depth > self.stats.max_depth_seen {
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self.stats.max_depth_seen = self.stats.current_depth;
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}
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}
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/// Get a reference to the adaptive playout delay estimator, if enabled.
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pub fn adaptive_delay(&self) -> Option<&AdaptivePlayoutDelay> {
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self.adaptive.as_ref()
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}
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/// Adjust target depth based on observed jitter.
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pub fn set_target_depth(&mut self, depth: usize) {
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self.target_depth = depth.min(self.max_depth);
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@@ -334,4 +532,192 @@ mod tests {
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other => panic!("expected packet 0, got {:?}", other),
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}
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}
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// ---------------------------------------------------------------
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// AdaptivePlayoutDelay tests
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// ---------------------------------------------------------------
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#[test]
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fn adaptive_delay_stable() {
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// Feed packets with consistent 20ms spacing — target should stay at minimum.
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let mut apd = AdaptivePlayoutDelay::new(3, 50);
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for i in 0u64..200 {
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let arrival_ms = i * 20;
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let expected_ms = i * 20;
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apd.update(arrival_ms, expected_ms);
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}
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// With zero jitter, target should be min_delay (ceil(0/20) + 2 = 2,
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// clamped to min_delay=3).
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assert_eq!(apd.target_delay(), 3);
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assert!(
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apd.jitter_estimate_ms() < 1.0,
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"jitter estimate should be near zero, got {}",
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apd.jitter_estimate_ms()
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);
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}
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#[test]
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fn adaptive_delay_increases_on_jitter() {
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// Feed packets with variable spacing (±10ms jitter).
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let mut apd = AdaptivePlayoutDelay::new(3, 50);
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// Alternate: arrive 10ms early / 10ms late
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for i in 0u64..200 {
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let expected_ms = i * 20;
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let jitter_offset: i64 = if i % 2 == 0 { 10 } else { -10 };
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let arrival_ms = (expected_ms as i64 + jitter_offset).max(0) as u64;
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apd.update(arrival_ms, expected_ms);
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}
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// Inter-arrival jitter should be ~20ms (swing of 10 to -10 = delta 20).
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// target = ceil(~20/20) + 2 = 3, but EMA converges near 20 so target >= 3.
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assert!(
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apd.target_delay() >= 3,
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"target should increase with jitter, got {}",
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apd.target_delay()
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);
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assert!(
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apd.jitter_estimate_ms() > 5.0,
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"jitter estimate should be significant, got {}",
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apd.jitter_estimate_ms()
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);
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}
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#[test]
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fn adaptive_delay_decreases_on_recovery() {
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let mut apd = AdaptivePlayoutDelay::new(3, 50);
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// Phase 1: high jitter (±30ms)
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for i in 0u64..200 {
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let expected_ms = i * 20;
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let offset: i64 = if i % 2 == 0 { 30 } else { -30 };
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let arrival_ms = (expected_ms as i64 + offset).max(0) as u64;
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apd.update(arrival_ms, expected_ms);
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}
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let high_target = apd.target_delay();
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let high_jitter = apd.jitter_estimate_ms();
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// Phase 2: stable (no jitter) — target should decrease via EMA decay
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for i in 200u64..600 {
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let t = i * 20;
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apd.update(t, t);
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}
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let low_target = apd.target_delay();
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let low_jitter = apd.jitter_estimate_ms();
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assert!(
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low_target <= high_target,
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"target should decrease after recovery: {} -> {}",
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high_target,
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low_target
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);
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assert!(
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low_jitter < high_jitter,
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"jitter estimate should decrease: {} -> {}",
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high_jitter,
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low_jitter
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);
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}
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#[test]
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fn adaptive_delay_clamped() {
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let mut apd = AdaptivePlayoutDelay::new(3, 10);
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// Extreme jitter: packets arrive with huge variance
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for i in 0u64..500 {
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let expected_ms = i * 20;
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let offset: i64 = if i % 2 == 0 { 500 } else { -500 };
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let arrival_ms = (expected_ms as i64 + offset).max(0) as u64;
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apd.update(arrival_ms, expected_ms);
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}
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assert!(
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apd.target_delay() <= 10,
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"target should not exceed max_delay=10, got {}",
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apd.target_delay()
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);
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assert!(
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apd.target_delay() >= 3,
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"target should not go below min_delay=3, got {}",
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apd.target_delay()
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);
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}
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#[test]
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fn adaptive_jitter_estimate() {
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let mut apd = AdaptivePlayoutDelay::new(3, 50);
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// Initial jitter estimate should be zero
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assert_eq!(apd.jitter_estimate_ms(), 0.0);
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// After one packet, still zero (no delta yet)
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apd.update(0, 0);
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assert_eq!(apd.jitter_estimate_ms(), 0.0);
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// Second packet with 5ms jitter
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apd.update(25, 20); // arrived 5ms late
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assert!(
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apd.jitter_estimate_ms() > 0.0,
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"jitter estimate should be positive after jittery packet"
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);
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assert!(
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apd.jitter_estimate_ms() <= 5.0,
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"first jitter sample of 5ms with alpha=0.05 should not exceed 5ms, got {}",
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apd.jitter_estimate_ms()
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);
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// Feed many packets with ~15ms jitter — EMA should converge
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for i in 2u64..500 {
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let expected_ms = i * 20;
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let arrival_ms = expected_ms + 15; // consistently 15ms late
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apd.update(arrival_ms, expected_ms);
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}
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// Steady-state: inter-arrival jitter = |35 - 20| = 0 actually,
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// because if every packet is 15ms late, delta_actual = 35-35 = 20,
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// same as expected. So jitter should converge toward 0.
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// Let's use variable jitter instead for a better test.
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let mut apd2 = AdaptivePlayoutDelay::new(3, 50);
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for i in 0u64..500 {
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let expected_ms = i * 20;
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// Alternate 0ms and 15ms late
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let extra = if i % 2 == 0 { 0 } else { 15 };
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let arrival_ms = expected_ms + extra;
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apd2.update(arrival_ms, expected_ms);
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}
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let est = apd2.jitter_estimate_ms();
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assert!(
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est > 5.0 && est < 20.0,
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"jitter estimate should converge near 15ms with alternating 0/15ms offsets, got {}",
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est
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);
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}
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// ---------------------------------------------------------------
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// JitterBuffer with adaptive mode tests
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// ---------------------------------------------------------------
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#[test]
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fn jitter_buffer_adaptive_constructor() {
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let jb = JitterBuffer::new_adaptive(5, 250);
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assert!(jb.adaptive_delay().is_some());
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assert_eq!(jb.adaptive_delay().unwrap().target_delay(), 5);
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}
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#[test]
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fn jitter_buffer_adaptive_push_with_arrival() {
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let mut jb = JitterBuffer::new_adaptive(3, 50);
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// Push packets with consistent timing
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for i in 0u16..20 {
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let pkt = make_packet(i);
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let arrival_ms = i as u64 * 20;
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jb.push_with_arrival(pkt, arrival_ms);
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}
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// With zero jitter, target should stay at min
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let ad = jb.adaptive_delay().unwrap();
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assert_eq!(ad.target_delay(), 3);
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}
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}
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Reference in New Issue
Block a user