From 67f00fe5a1f5074a203975b0260a9900c4ac80c2 Mon Sep 17 00:00:00 2001
From: David Chen <chenosaurus@gmail.com>
Date: Thu, 4 Sep 2025 16:54:38 -0700
Subject: [PATCH 1/3] add preconnect buffer option to ffi room proto

---
 livekit-ffi/protocol/room.proto | 1 +
 1 file changed, 1 insertion(+)

diff --git a/livekit-ffi/protocol/room.proto b/livekit-ffi/protocol/room.proto
index 94203d096..f1f1da372 100644
--- a/livekit-ffi/protocol/room.proto
+++ b/livekit-ffi/protocol/room.proto
@@ -261,6 +261,7 @@ message TrackPublishOptions {
   optional bool simulcast = 6;
   optional TrackSource source = 7;
   optional string stream = 8;
+  optional bool preconnect_buffer = 9;
 }
 
 enum IceTransportType {

From 7eb5488542aab11240c7de0234cc1004e7a91ef7 Mon Sep 17 00:00:00 2001
From: David Chen <chenosaurus@gmail.com>
Date: Thu, 4 Sep 2025 17:11:15 -0700
Subject: [PATCH 2/3] set AudioTrackFeatures on AddTrackRequest

---
 livekit-ffi/src/livekit.proto.rs                  | 2 ++
 livekit/src/room/options.rs                       | 2 ++
 livekit/src/room/participant/local_participant.rs | 4 ++++
 3 files changed, 8 insertions(+)

diff --git a/livekit-ffi/src/livekit.proto.rs b/livekit-ffi/src/livekit.proto.rs
index 410c07b92..48bf8dda6 100644
--- a/livekit-ffi/src/livekit.proto.rs
+++ b/livekit-ffi/src/livekit.proto.rs
@@ -3256,6 +3256,8 @@ pub struct TrackPublishOptions {
     pub source: ::core::option::Option<i32>,
     #[prost(string, optional, tag="8")]
     pub stream: ::core::option::Option<::prost::alloc::string::String>,
+    #[prost(bool, optional, tag="9")]
+    pub preconnect_buffer: ::core::option::Option<bool>,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
 #[derive(Clone, PartialEq, ::prost::Message)]
diff --git a/livekit/src/room/options.rs b/livekit/src/room/options.rs
index e17ac2145..8188e7422 100644
--- a/livekit/src/room/options.rs
+++ b/livekit/src/room/options.rs
@@ -85,6 +85,7 @@ pub struct TrackPublishOptions {
     // pub name: String,
     pub source: TrackSource,
     pub stream: String,
+    pub preconnect_buffer: bool,
 }
 
 impl Default for TrackPublishOptions {
@@ -98,6 +99,7 @@ impl Default for TrackPublishOptions {
             simulcast: true,
             source: TrackSource::Unknown,
             stream: "".to_string(),
+            preconnect_buffer: false,
         }
     }
 }
diff --git a/livekit/src/room/participant/local_participant.rs b/livekit/src/room/participant/local_participant.rs
index f4a12d627..edeac969b 100644
--- a/livekit/src/room/participant/local_participant.rs
+++ b/livekit/src/room/participant/local_participant.rs
@@ -245,6 +245,10 @@ impl LocalParticipant {
             ..Default::default()
         };
 
+        if options.preconnect_buffer {
+            req.audio_features.push(proto::AudioTrackFeature::TfPreconnectBuffer as i32);
+        }
+
         let mut encodings = Vec::default();
         match &track {
             LocalTrack::Video(video_track) => {

From 22fb50f73236a2253c1ec9e297c0bbd4b5c393d8 Mon Sep 17 00:00:00 2001
From: David Chen <chenosaurus@gmail.com>
Date: Thu, 4 Sep 2025 17:30:15 -0700
Subject: [PATCH 3/3] add preconect to conversion from proto to
 TrackPublishOptions

---
 livekit-ffi/src/conversion/room.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/livekit-ffi/src/conversion/room.rs b/livekit-ffi/src/conversion/room.rs
index 81772aa7f..b5001649e 100644
--- a/livekit-ffi/src/conversion/room.rs
+++ b/livekit-ffi/src/conversion/room.rs
@@ -232,6 +232,9 @@ impl From<proto::TrackPublishOptions> for TrackPublishOptions {
             red: opts.red.unwrap_or(default_publish_options.red),
             simulcast: opts.simulcast.unwrap_or(default_publish_options.simulcast),
             stream: opts.stream.unwrap_or(default_publish_options.stream),
+            preconnect_buffer: opts
+                .preconnect_buffer
+                .unwrap_or(default_publish_options.preconnect_buffer),
         }
     }
 }