From b0a4e2ea93fafc4d65d474f3ada616a0ad5e19d5 Mon Sep 17 00:00:00 2001
From: Ariver <ar@Arm1.local>
Date: Sun, 12 Jul 2026 11:39:35 +0800
Subject: [PATCH] feat: bind helper stream timing markers
---
src/main.rs | 452 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 425 insertions(+), 27 deletions(-)
diff --git a/src/main.rs b/src/main.rs
index 281351d..611993a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,6 +34,7 @@
use reqwest::Client;
use serde::{Deserialize, Serialize};
use serde_json::json;
+use sha2::{Digest, Sha256};
use tokio::time::{sleep, sleep_until, timeout};
use tokio::{
sync::{mpsc, mpsc::UnboundedReceiver, watch},
@@ -51,6 +52,11 @@
const PCM_16K_SAMPLE_RATE_HZ: u32 = 16_000;
const BOT_NUM_CHANNELS: u16 = 1;
const TRACK_NAME: &str = "bot-main-audio";
+const STREAM_TIMING_VERSION: u32 = 1;
+const STREAM_TIMING_FIRST_SEGMENT: u64 = 1;
+const STREAM_TIMING_FIRST_CHUNK: u64 = 1;
+const STREAM_TIMING_MAX_ELAPSED_MS: u64 = 5_000;
+const STREAM_TIMING_SOURCE: &str = "stream_anchor_monotonic";
#[tokio::main(flavor = "multi_thread")]
async fn main() -> Result<()> {
@@ -660,6 +666,31 @@
"reasonCode": reason_code,
"retryable": retryable,
"extension": extension,
+ });
+ println!("{payload}");
+}
+
+fn emit_anchored_activity(
+ call_id: &str,
+ trace_id: &str,
+ turn_id: &str,
+ event_name: &str,
+ marker: &RuntimeTurnStreamTimingMarker,
+ extension: serde_json::Value,
+) {
+ let payload = json!({
+ "type": "cv_activity",
+ "callId": call_id,
+ "traceId": trace_id,
+ "turnId": turn_id,
+ "eventName": event_name,
+ "eventWallTimeMs": current_time_millis(),
+ "serverDeltaMs": marker.server_delta_ms,
+ "serverDeltaSource": STREAM_TIMING_SOURCE,
+ "result": "ok",
+ "reasonCode": null,
+ "retryable": null,
+ "extension": marker.extension_with(extension),
});
println!("{payload}");
}
@@ -1420,6 +1451,7 @@
.await?;
}
}
+ state.close_timing();
if !state.completed {
warn!(
call_id = %call_id,
@@ -1549,6 +1581,7 @@
call_id,
trace_id,
turn,
+ &event,
audio_chunk,
state,
turn_pipeline_started_at,
@@ -1567,6 +1600,7 @@
}
Some("turn_completed") => {
state.completed = true;
+ state.close_timing();
info!(
call_id = %call_id,
trace_id = %trace_id,
@@ -1577,6 +1611,7 @@
);
}
Some("turn_failed") => {
+ state.close_timing();
let error = event.error.as_ref();
let reason_code = error
.and_then(|value| value.reason_code.as_deref())
@@ -1611,6 +1646,7 @@
}
Some("turn_cancelled") => {
state.completed = true;
+ state.close_timing();
info!(
call_id = %call_id,
trace_id = %trace_id,
@@ -1643,6 +1679,19 @@
}
Some("activity") => {
if let Some(activity) = event.activity.as_ref() {
+ if activity.event_type.as_deref() == Some("tts_first_audio_chunk_ready") {
+ if let Some(runtime_session_nonce) =
+ bridge_config.runtime_session_nonce.as_deref()
+ {
+ let _ = state.arm_timing_anchor(
+ call_id,
+ trace_id,
+ &turn.turn_id,
+ runtime_session_nonce,
+ &event,
+ );
+ }
+ }
info!(
call_id = %call_id,
trace_id = %trace_id,
@@ -1701,6 +1750,7 @@
call_id: &str,
trace_id: &str,
turn: &FinishedSpeechTurn,
+ event: &RuntimeTurnStreamEvent,
audio_chunk: &RuntimeTurnStreamAudioChunk,
state: &mut RuntimeTurnStreamState,
turn_pipeline_started_at: Instant,
@@ -1724,21 +1774,37 @@
return Err(anyhow!("unsupported reply_audio_chunk format {format}"));
}
match state.reply_chunk_markers.observe(audio_chunk.segment_seq) {
- ReplyChunkMarker::FirstReply => emit_activity(
- call_id,
- trace_id,
- Some(&turn.turn_id),
- "helper_first_reply_audio_chunk_received",
- "ok",
- None,
- None,
- json!({
+ ReplyChunkMarker::FirstReply => {
+ let extension = json!({
"segmentSeq": audio_chunk.segment_seq,
"chunkSeq": audio_chunk.chunk_seq,
"format": format.as_str(),
"bytes": payload.len(),
- }),
- ),
+ });
+ if let Some(marker) =
+ state.record_m6(call_id, trace_id, &turn.turn_id, event, audio_chunk)
+ {
+ emit_anchored_activity(
+ call_id,
+ trace_id,
+ &turn.turn_id,
+ "helper_first_reply_audio_chunk_received",
+ &marker,
+ extension,
+ );
+ } else {
+ emit_activity(
+ call_id,
+ trace_id,
+ Some(&turn.turn_id),
+ "helper_first_reply_audio_chunk_received",
+ "ok",
+ None,
+ None,
+ extension,
+ );
+ }
+ }
ReplyChunkMarker::SegmentFirst => emit_activity(
call_id,
trace_id,
@@ -1875,21 +1941,33 @@
sink.write_pcm_frame(frame).await?;
if !state.first_audio_frame_written {
state.first_audio_frame_written = true;
- emit_activity(
- call_id,
- trace_id,
- Some(&turn.turn_id),
- "bot_reply_first_audio_frame_written",
- "ok",
- None,
- None,
- json!({
- "replyPlaybackMode": state.reply_playback_mode.as_str(),
- "format": format.as_str(),
- "chunkSeq": audio_chunk.chunk_seq,
- "replyTotalAfterVadEndMs": turn_pipeline_started_at.elapsed().as_millis() as u64,
- }),
- );
+ let extension = json!({
+ "replyPlaybackMode": state.reply_playback_mode.as_str(),
+ "format": format.as_str(),
+ "chunkSeq": audio_chunk.chunk_seq,
+ "replyTotalAfterVadEndMs": turn_pipeline_started_at.elapsed().as_millis() as u64,
+ });
+ if let Some(marker) = state.record_m7() {
+ emit_anchored_activity(
+ call_id,
+ trace_id,
+ &turn.turn_id,
+ "bot_reply_first_audio_frame_written",
+ &marker,
+ extension,
+ );
+ } else {
+ emit_activity(
+ call_id,
+ trace_id,
+ Some(&turn.turn_id),
+ "bot_reply_first_audio_frame_written",
+ "ok",
+ None,
+ None,
+ extension,
+ );
+ }
}
sleep_until(pacing_started_at + Duration::from_millis(((index + 1) as u64) * 20)).await;
}
@@ -2347,6 +2425,7 @@
pcm_stream_decoder: Option<audio::PcmS16leStreamDecoder>,
pcm_stream_network_chunk_count: u64,
reply_chunk_markers: ReplyChunkMarkerState,
+ timing: RuntimeTurnStreamTimingState,
}
impl Default for RuntimeTurnStreamState {
@@ -2363,8 +2442,233 @@
pcm_stream_decoder: None,
pcm_stream_network_chunk_count: 0,
reply_chunk_markers: ReplyChunkMarkerState::default(),
+ timing: RuntimeTurnStreamTimingState::default(),
}
}
+}
+
+impl RuntimeTurnStreamState {
+ fn arm_timing_anchor(
+ &mut self,
+ call_id: &str,
+ trace_id: &str,
+ turn_id: &str,
+ runtime_session_nonce: &str,
+ event: &RuntimeTurnStreamEvent,
+ ) -> bool {
+ if self.timing.phase != RuntimeTurnStreamTimingPhase::Empty
+ || event.call_id.as_deref() != Some(call_id)
+ || event.trace_id.as_deref() != Some(trace_id)
+ || event.turn_id.as_deref() != Some(turn_id)
+ {
+ return false;
+ }
+ let Some(activity) = event.activity.as_ref() else {
+ return false;
+ };
+ if activity.event_type.as_deref() != Some("tts_first_audio_chunk_ready") {
+ return false;
+ }
+ let Some(extension) = activity.extension.as_ref() else {
+ return false;
+ };
+ let Some(anchor_id) = extension.stream_anchor_id.as_deref() else {
+ return false;
+ };
+ let valid_anchor_id = (16..=64).contains(&anchor_id.len()) && anchor_id.is_ascii();
+ let expected_nonce_hash = runtime_session_nonce_hash(runtime_session_nonce);
+ if extension.stream_timing_version != Some(STREAM_TIMING_VERSION)
+ || !valid_anchor_id
+ || extension.runtime_session_nonce_hash.as_deref() != Some(expected_nonce_hash.as_str())
+ || extension.segment_seq != Some(STREAM_TIMING_FIRST_SEGMENT)
+ || extension.stream_timing_validation.as_deref() != Some("bound")
+ {
+ return false;
+ }
+ let Some(server_delta_ms) = extension.stream_anchor_server_delta_ms else {
+ return false;
+ };
+ self.timing.anchor = Some(RuntimeTurnStreamTimingAnchor {
+ call_id: call_id.to_string(),
+ trace_id: trace_id.to_string(),
+ turn_id: turn_id.to_string(),
+ anchor_id: anchor_id.to_string(),
+ server_delta_ms,
+ runtime_session_nonce_hash: expected_nonce_hash,
+ segment_seq: STREAM_TIMING_FIRST_SEGMENT,
+ received_at: Instant::now(),
+ });
+ self.timing.phase = RuntimeTurnStreamTimingPhase::Armed;
+ true
+ }
+
+ fn record_m6(
+ &mut self,
+ call_id: &str,
+ trace_id: &str,
+ turn_id: &str,
+ event: &RuntimeTurnStreamEvent,
+ audio_chunk: &RuntimeTurnStreamAudioChunk,
+ ) -> Option<RuntimeTurnStreamTimingMarker> {
+ if self.timing.phase != RuntimeTurnStreamTimingPhase::Armed {
+ return None;
+ }
+ let anchor = self.timing.anchor.as_ref()?;
+ if anchor.call_id != call_id
+ || anchor.trace_id != trace_id
+ || anchor.turn_id != turn_id
+ || event.call_id.as_deref() != Some(call_id)
+ || event.trace_id.as_deref() != Some(trace_id)
+ || event.turn_id.as_deref() != Some(turn_id)
+ || audio_chunk.segment_seq != Some(anchor.segment_seq)
+ || audio_chunk.chunk_seq != Some(STREAM_TIMING_FIRST_CHUNK)
+ || audio_chunk.stream_timing_version != Some(STREAM_TIMING_VERSION)
+ || audio_chunk.stream_anchor_id.as_deref() != Some(anchor.anchor_id.as_str())
+ {
+ return None;
+ }
+ let Some(marker) = RuntimeTurnStreamTimingMarker::from_anchor(
+ anchor,
+ audio_chunk.chunk_seq.unwrap_or(STREAM_TIMING_FIRST_CHUNK),
+ ) else {
+ self.close_timing();
+ return None;
+ };
+ self.timing.chunk_seq = Some(marker.chunk_seq);
+ self.timing.phase = RuntimeTurnStreamTimingPhase::M6Recorded;
+ Some(marker)
+ }
+
+ fn record_m7(&mut self) -> Option<RuntimeTurnStreamTimingMarker> {
+ if self.timing.phase != RuntimeTurnStreamTimingPhase::M6Recorded {
+ return None;
+ }
+ let anchor = self.timing.anchor.as_ref()?;
+ let Some(marker) = RuntimeTurnStreamTimingMarker::from_anchor(
+ anchor,
+ self.timing.chunk_seq.unwrap_or(STREAM_TIMING_FIRST_CHUNK),
+ ) else {
+ self.close_timing();
+ return None;
+ };
+ self.timing.phase = RuntimeTurnStreamTimingPhase::M7Recorded;
+ Some(marker)
+ }
+
+ fn close_timing(&mut self) {
+ self.timing.close();
+ }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum RuntimeTurnStreamTimingPhase {
+ Empty,
+ Armed,
+ M6Recorded,
+ M7Recorded,
+ Closed,
+}
+
+struct RuntimeTurnStreamTimingState {
+ phase: RuntimeTurnStreamTimingPhase,
+ anchor: Option<RuntimeTurnStreamTimingAnchor>,
+ chunk_seq: Option<u64>,
+}
+
+impl Default for RuntimeTurnStreamTimingState {
+ fn default() -> Self {
+ Self {
+ phase: RuntimeTurnStreamTimingPhase::Empty,
+ anchor: None,
+ chunk_seq: None,
+ }
+ }
+}
+
+impl RuntimeTurnStreamTimingState {
+ fn close(&mut self) {
+ self.anchor = None;
+ self.chunk_seq = None;
+ self.phase = RuntimeTurnStreamTimingPhase::Closed;
+ }
+}
+
+impl Drop for RuntimeTurnStreamTimingState {
+ fn drop(&mut self) {
+ self.anchor = None;
+ self.chunk_seq = None;
+ }
+}
+
+struct RuntimeTurnStreamTimingAnchor {
+ call_id: String,
+ trace_id: String,
+ turn_id: String,
+ anchor_id: String,
+ server_delta_ms: u64,
+ runtime_session_nonce_hash: String,
+ segment_seq: u64,
+ received_at: Instant,
+}
+
+struct RuntimeTurnStreamTimingMarker {
+ version: u32,
+ anchor_id: String,
+ anchor_server_delta_ms: u64,
+ anchor_elapsed_ms: u64,
+ server_delta_ms: u64,
+ runtime_session_nonce_hash: String,
+ segment_seq: u64,
+ chunk_seq: u64,
+}
+
+impl RuntimeTurnStreamTimingMarker {
+ fn from_anchor(anchor: &RuntimeTurnStreamTimingAnchor, chunk_seq: u64) -> Option<Self> {
+ let elapsed_ms = u64::try_from(anchor.received_at.elapsed().as_millis()).ok()?;
+ if elapsed_ms > STREAM_TIMING_MAX_ELAPSED_MS {
+ return None;
+ }
+ Some(Self {
+ version: STREAM_TIMING_VERSION,
+ anchor_id: anchor.anchor_id.clone(),
+ anchor_server_delta_ms: anchor.server_delta_ms,
+ anchor_elapsed_ms: elapsed_ms,
+ server_delta_ms: anchor.server_delta_ms.checked_add(elapsed_ms)?,
+ runtime_session_nonce_hash: anchor.runtime_session_nonce_hash.clone(),
+ segment_seq: anchor.segment_seq,
+ chunk_seq,
+ })
+ }
+
+ fn extension_with(&self, extra: serde_json::Value) -> serde_json::Value {
+ let mut extension = match extra {
+ serde_json::Value::Object(value) => value,
+ _ => serde_json::Map::new(),
+ };
+ extension.insert("streamTimingVersion".to_string(), json!(self.version));
+ extension.insert("streamAnchorId".to_string(), json!(self.anchor_id));
+ extension.insert(
+ "streamAnchorServerDeltaMs".to_string(),
+ json!(self.anchor_server_delta_ms),
+ );
+ extension.insert("anchorElapsedMs".to_string(), json!(self.anchor_elapsed_ms));
+ extension.insert(
+ "runtimeSessionNonceHash".to_string(),
+ json!(self.runtime_session_nonce_hash),
+ );
+ extension.insert("segmentSeq".to_string(), json!(self.segment_seq));
+ extension.insert("chunkSeq".to_string(), json!(self.chunk_seq));
+ extension.insert("streamTimingValidation".to_string(), json!("bound"));
+ serde_json::Value::Object(extension)
+ }
+}
+
+fn runtime_session_nonce_hash(value: &str) -> String {
+ let digest = Sha256::digest(value.as_bytes());
+ digest[..6]
+ .iter()
+ .map(|byte| format!("{byte:02x}"))
+ .collect()
}
#[derive(Debug, PartialEq, Eq)]
@@ -2412,6 +2716,12 @@
struct RuntimeTurnStreamEvent {
#[serde(rename = "type", alias = "event")]
event_type: Option<String>,
+ #[serde(rename = "callId")]
+ call_id: Option<String>,
+ #[serde(rename = "traceId")]
+ trace_id: Option<String>,
+ #[serde(rename = "turnId")]
+ turn_id: Option<String>,
#[serde(rename = "seq")]
seq: Option<u64>,
#[serde(rename = "replyPlaybackMode")]
@@ -2449,6 +2759,10 @@
chunk_seq: Option<u64>,
#[serde(rename = "segmentSeq")]
segment_seq: Option<u64>,
+ #[serde(rename = "streamTimingVersion")]
+ stream_timing_version: Option<u32>,
+ #[serde(rename = "streamAnchorId")]
+ stream_anchor_id: Option<String>,
format: Option<String>,
#[serde(rename = "sampleRate")]
sample_rate: Option<u32>,
@@ -2465,6 +2779,23 @@
stage: Option<String>,
#[serde(rename = "reasonCode")]
reason_code: Option<String>,
+ extension: Option<RuntimeTurnStreamTimingExtension>,
+}
+
+#[derive(Clone, Deserialize)]
+struct RuntimeTurnStreamTimingExtension {
+ #[serde(rename = "streamTimingVersion")]
+ stream_timing_version: Option<u32>,
+ #[serde(rename = "streamAnchorId")]
+ stream_anchor_id: Option<String>,
+ #[serde(rename = "streamAnchorServerDeltaMs")]
+ stream_anchor_server_delta_ms: Option<u64>,
+ #[serde(rename = "runtimeSessionNonceHash")]
+ runtime_session_nonce_hash: Option<String>,
+ #[serde(rename = "segmentSeq")]
+ segment_seq: Option<u64>,
+ #[serde(rename = "streamTimingValidation")]
+ stream_timing_validation: Option<String>,
}
#[derive(Deserialize)]
@@ -3562,7 +3893,10 @@
#[cfg(test)]
mod tests {
- use super::{ReplyChunkMarker, ReplyChunkMarkerState, RuntimeTurnStreamEvent};
+ use super::{
+ ReplyChunkMarker, ReplyChunkMarkerState, RuntimeTurnStreamEvent, RuntimeTurnStreamState,
+ RuntimeTurnStreamTimingPhase, runtime_session_nonce_hash,
+ };
#[test]
fn reply_chunk_marker_state_emits_turn_first_once_and_later_segment_first_once() {
@@ -3595,4 +3929,68 @@
event.audio_chunk.and_then(|chunk| chunk.segment_seq)
);
}
+
+ #[test]
+ fn runtime_turn_stream_reads_frozen_m5_and_audio_chunk_timing_contract() {
+ let activity: RuntimeTurnStreamEvent = serde_json::from_str(
+ r#"{"type":"activity","callId":"call-1","traceId":"trace-1","turnId":"turn-1","activity":{"eventType":"tts_first_audio_chunk_ready","extension":{"streamTimingVersion":1,"streamAnchorId":"0123456789abcdef","streamAnchorServerDeltaMs":1200,"runtimeSessionNonceHash":"abcdef012345","segmentSeq":1,"streamTimingValidation":"bound"}}}"#,
+ )
+ .expect("m5 activity event");
+ let audio: RuntimeTurnStreamEvent = serde_json::from_str(
+ r#"{"type":"reply_audio_chunk","callId":"call-1","traceId":"trace-1","turnId":"turn-1","audioChunk":{"chunkSeq":1,"segmentSeq":1,"streamTimingVersion":1,"streamAnchorId":"0123456789abcdef","format":"pcm_s16le","payloadBase64":"AA==","last":false}}"#,
+ )
+ .expect("timed audio chunk event");
+
+ assert_eq!(Some("call-1"), activity.call_id.as_deref());
+ assert_eq!(Some("trace-1"), activity.trace_id.as_deref());
+ assert_eq!(Some("turn-1"), activity.turn_id.as_deref());
+ let extension = activity.activity.unwrap().extension.unwrap();
+ assert_eq!(Some(1), extension.stream_timing_version);
+ assert_eq!(Some(1200), extension.stream_anchor_server_delta_ms);
+ assert_eq!(
+ Some("0123456789abcdef"),
+ audio.audio_chunk.unwrap().stream_anchor_id.as_deref()
+ );
+ }
+
+ #[test]
+ fn runtime_turn_stream_timing_records_m6_and_m7_once_then_rejects_terminal_late_events() {
+ let nonce = "runtime-nonce";
+ let nonce_hash = runtime_session_nonce_hash(nonce);
+ let activity: RuntimeTurnStreamEvent = serde_json::from_str(&format!(
+ r#"{{"type":"activity","callId":"call-1","traceId":"trace-1","turnId":"turn-1","activity":{{"eventType":"tts_first_audio_chunk_ready","extension":{{"streamTimingVersion":1,"streamAnchorId":"0123456789abcdef","streamAnchorServerDeltaMs":1200,"runtimeSessionNonceHash":"{nonce_hash}","segmentSeq":1,"streamTimingValidation":"bound"}}}}}}"#,
+ ))
+ .expect("m5 activity event");
+ let audio: RuntimeTurnStreamEvent = serde_json::from_str(
+ r#"{"type":"reply_audio_chunk","callId":"call-1","traceId":"trace-1","turnId":"turn-1","audioChunk":{"chunkSeq":1,"segmentSeq":1,"streamTimingVersion":1,"streamAnchorId":"0123456789abcdef","format":"pcm_s16le","payloadBase64":"AA==","last":false}}"#,
+ )
+ .expect("timed audio chunk event");
+ let mut state = RuntimeTurnStreamState::default();
+
+ assert!(state.arm_timing_anchor("call-1", "trace-1", "turn-1", nonce, &activity));
+ let chunk = audio.audio_chunk.as_ref().expect("audio chunk");
+ assert!(
+ state
+ .record_m6("call-1", "trace-1", "turn-1", &audio, chunk)
+ .is_some()
+ );
+ assert!(
+ state
+ .record_m6("call-1", "trace-1", "turn-1", &audio, chunk)
+ .is_none()
+ );
+ assert!(state.record_m7().is_some());
+ assert!(state.record_m7().is_none());
+
+ state.close_timing();
+ assert_eq!(RuntimeTurnStreamTimingPhase::Closed, state.timing.phase);
+ assert!(state.timing.anchor.is_none());
+ assert!(!state.arm_timing_anchor("call-1", "trace-1", "turn-1", nonce, &activity));
+ assert!(
+ state
+ .record_m6("call-1", "trace-1", "turn-1", &audio, chunk)
+ .is_none()
+ );
+ assert!(state.record_m7().is_none());
+ }
}
--
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