diff --git a/src/client/mod.rs b/src/client/mod.rs
index ec08a5e..93a27a8 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -9,7 +9,6 @@ use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 use std::num::NonZeroU32;
 use std::sync::{Arc, Mutex};
 use std::task::Poll;
-use std::time::Instant;
 use std::{fmt::Debug, num::NonZeroU16, pin::Pin};
 
 use self::channel_mapping::*;
@@ -1741,7 +1740,6 @@ impl Session<Playing> {
                     local_addr: SocketAddr::new(sockets.local_ip, sockets.local_rtp_port + 1),
                     peer_addr: SocketAddr::new(sockets.remote_ip, sockets.remote_rtcp_port),
                     received_wall: crate::WallTime::now(),
-                    received: Instant::now(),
                 });
                 match r {
                     Ok(()) => {
@@ -1780,7 +1778,6 @@ impl Session<Playing> {
                     local_addr: SocketAddr::new(sockets.local_ip, sockets.local_rtp_port),
                     peer_addr: SocketAddr::new(sockets.remote_ip, sockets.remote_rtp_port),
                     received_wall: crate::WallTime::now(),
-                    received: Instant::now(),
                 });
                 match r {
                     Ok(()) => {
diff --git a/src/codec/aac.rs b/src/codec/aac.rs
index e1f22aa..5731fac 100644
--- a/src/codec/aac.rs
+++ b/src/codec/aac.rs
@@ -50,6 +50,8 @@ struct ChannelConfig {
     ncc: u16,
 
     /// A human-friendly name for the channel configuration.
+    // The name is used in tests and in the Debug output. Suppress dead code warning.
+    #[cfg_attr(not(test), allow(dead_code))]
     name: &'static str,
 }
 
@@ -425,6 +427,11 @@ pub(crate) struct Depacketizer {
     state: DepacketizerState,
 }
 
+/// [DepacketizerState] holding access units within a single RTP packet.
+///
+/// This is the state used when there are multiple access units within a packet
+/// (thus the name), when there's a single access unit, and even at the
+/// beginning of a fragment.
 #[derive(Debug)]
 struct Aggregate {
     ctx: crate::PacketContext,
@@ -450,10 +457,11 @@ struct Aggregate {
     /// The buffer, positioned at frame 0's header.
     buf: Bytes,
 
-    /// The index in range `[0, frame_count)` of the next frame to output.
+    /// The index in range `[0, frame_count)` of the next frame to return from `pull`.
     frame_i: u16,
 
-    /// The non-zero total frames within this aggregate.
+    /// The total non-zero total frames within this aggregate (including ones which have already
+    /// been returned by `pull`).
     frame_count: u16,
 
     /// The starting byte offset of `frame_i`'s data within `buf`.
@@ -465,6 +473,7 @@ struct Aggregate {
     mark: bool,
 }
 
+/// The received prefix of a single access unit which has been spread across multiple packets.
 #[derive(Debug)]
 struct Fragment {
     rtp_timestamp: u16,
@@ -481,14 +490,22 @@ struct Fragment {
     buf: BytesMut,
 }
 
+/// State of the depacketizer between calls to `push` and `pull`.
 #[derive(Debug)]
 #[allow(clippy::large_enum_variant)]
 enum DepacketizerState {
+    /// State when there's no buffered data.
     Idle {
         prev_loss: u16,
         loss_since_mark: bool,
     },
+
+    /// State after a packet has been RTP packet has been received. As described at
+    /// [`Aggregate`], this may hold the first packet of a fragment, one packet, or multiple
+    /// complete packets.
     Aggregated(Aggregate),
+
+    /// State when a prefix of a fragmented packet has been received.
     Fragmented(Fragment),
     Ready(super::AudioFrame),
 }
diff --git a/src/lib.rs b/src/lib.rs
index 2729f04..24fc9b3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -269,7 +269,6 @@ pub struct ConnectionContext {
     local_addr: std::net::SocketAddr,
     peer_addr: std::net::SocketAddr,
     established_wall: WallTime,
-    established: std::time::Instant,
 }
 
 impl ConnectionContext {
@@ -280,7 +279,6 @@ impl ConnectionContext {
             local_addr: addr,
             peer_addr: addr,
             established_wall: WallTime::now(),
-            established: std::time::Instant::now(),
         }
     }
 }
@@ -364,7 +362,6 @@ enum PacketContextInner {
         local_addr: SocketAddr,
         peer_addr: SocketAddr,
         received_wall: WallTime,
-        received: std::time::Instant,
     },
     Dummy,
 }
diff --git a/src/tokio.rs b/src/tokio.rs
index cdd840b..3b45bfb 100644
--- a/src/tokio.rs
+++ b/src/tokio.rs
@@ -34,7 +34,6 @@ impl Connection {
 
     pub(crate) fn from_stream(stream: TcpStream) -> Result<Self, std::io::Error> {
         let established_wall = WallTime::now();
-        let established = Instant::now();
         let local_addr = stream.local_addr()?;
         let peer_addr = stream.peer_addr()?;
         Ok(Self(Framed::new(
@@ -44,7 +43,6 @@ impl Connection {
                     local_addr,
                     peer_addr,
                     established_wall,
-                    established,
                 },
                 read_pos: 0,
             },