From a27ea202a735d5aac418938b109b433871c68d2e Mon Sep 17 00:00:00 2001
From: "prompt.ac/@jeffrey" <mail@aesthetic.computer>
Date: Sun, 16 Aug 2026 12:39:38 -0400
Subject: [PATCH] =?UTF-8?q?Room=20audio=20grows=20ears=20for=20its=20own?=
 =?UTF-8?q?=20health:=20the=20sender=20meters=20the=20tapped=20stream=20ev?=
 =?UTF-8?q?ery=205=20s=20(peak=20+=20client=20count)=20and=20the=20receive?=
 =?UTF-8?q?r=20logs=20once=20when=20genuinely=20non-silent=20audio=20arriv?=
 =?UTF-8?q?es=20=E2=80=94=20because=20a=20room=20whose=20every=20leg=20rep?=
 =?UTF-8?q?orts=20locked=20can=20still=20be=20carrying=20pure=20silence,?=
 =?UTF-8?q?=20and=20that=20failure=20was=20indistinguishable=20from=20succ?=
 =?UTF-8?q?ess=20in=20the=20logs?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Sources/ACMacAudio/RoomReceiver.swift      |  5 +++++
 .../Sources/ACMacAudio/RoomSender.swift        | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/slab/macos-audio/Sources/ACMacAudio/RoomReceiver.swift b/slab/macos-audio/Sources/ACMacAudio/RoomReceiver.swift
index b0295056c..8b41f4df1 100644
--- a/slab/macos-audio/Sources/ACMacAudio/RoomReceiver.swift
+++ b/slab/macos-audio/Sources/ACMacAudio/RoomReceiver.swift
@@ -128,6 +128,7 @@ public final class ACAudioRoomReceiver: @unchecked Sendable {
     private let store = ACAudioPacketStore()
     private var nonce: UInt32 = 0
     private var didLogAudio = false
+    private var didLogSignal = false
     private var lastTrafficNanos: UInt64 = 0
 
     public init(configuration: Configuration) { self.configuration = configuration }
@@ -232,6 +233,10 @@ public final class ACAudioRoomReceiver: @unchecked Sendable {
                         self.didLogAudio = true
                         self.log("audio locked at \(packet.sampleRate) Hz, \(self.configuration.channel.name), gain \(self.configuration.gain)")
                     }
+                    if !self.didLogSignal, packet.pcm16.contains(where: { $0 > 2 && $0 < 254 }) {
+                        self.didLogSignal = true
+                        self.log("signal present (non-silent audio arriving)")
+                    }
                 default: break
                 }
             }
diff --git a/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift b/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift
index 524fa4198..bfd15bdf1 100644
--- a/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift
+++ b/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift
@@ -30,6 +30,7 @@ public final class ACAudioRoomSender: @unchecked Sendable {
     private var sequence: UInt32 = 0
     private var nextPresentationNanos: UInt64 = 0
     private var lastAudioNanos: UInt64 = 0
+    private var lastMeterNanos: UInt64 = 0
 
     public init(configuration: Configuration = .init()) {
         self.configuration = configuration
@@ -147,6 +148,23 @@ public final class ACAudioRoomSender: @unchecked Sendable {
             return
         }
 
+        // Level meter every ~5 s: "locked but silent" downstream is
+        // indistinguishable from success without knowing what the tap
+        // actually carries.
+        let meterNow = ACHostClock.nowNanos()
+        if meterNow &- lastMeterNanos > 5_000_000_000 {
+            lastMeterNanos = meterNow
+            var peak: Float = 0
+            for channel in 0..<2 {
+                for frame in 0..<Int(output.frameLength) {
+                    let v = abs(channels[channel][frame])
+                    if v > peak { peak = v }
+                }
+            }
+            log(String(format: "tap level peak %.4f (%u frames, %d clients)",
+                       peak, output.frameLength, connectedClients.count))
+        }
+
         let now = ACHostClock.nowNanos()
         if nextPresentationNanos == 0 || now > lastAudioNanos + 250_000_000 {
             session = UInt32.random(in: 1...UInt32.max)
-- 
2.51.2