[feat](trx-server,trx-client): raise default audio opus bitrate

Co-authored-by: Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/src/audio_bridge.rs

@@ -232,7 +232,7 @@ fn run_capture(
     };
     let mut encoder =
         opus::Encoder::new(info.sample_rate, opus_channels, opus::Application::Audio)?;
-    encoder.set_bitrate(opus::Bitrate::Bits(24_000))?;
+    encoder.set_bitrate(opus::Bitrate::Bits(cfg.bitrate_bps as i32))?;
     let mut opus_buf = vec![0u8; 4096];
 
     let (sample_tx, sample_rx) = std_mpsc::sync_channel::<Vec<f32>>(64);
@@ -251,8 +251,9 @@ fn run_capture(
 
     stream.play()?;
     info!(
-        "Audio bridge capture active on '{}'",
-        device.name().unwrap_or_else(|_| "unknown".to_string())
+        "Audio bridge capture active on '{}' ({} bps)",
+        device.name().unwrap_or_else(|_| "unknown".to_string()),
+        cfg.bitrate_bps
     );
 
     let tx_gain = cfg.tx_gain.max(0.0);

src/trx-client/src/config.rs

@@ -132,6 +132,8 @@ pub struct AudioBridgeConfig {
     pub rx_output_device: Option<String>,
     /// Local input device for TX uplink capture.
     pub tx_input_device: Option<String>,
+    /// Opus bitrate in bits per second for TX uplink capture.
+    pub bitrate_bps: u32,
     /// RX playback gain multiplier.
     pub rx_gain: f32,
     /// TX capture gain multiplier.
@@ -144,6 +146,7 @@ impl Default for AudioBridgeConfig {
             enabled: false,
             rx_output_device: None,
             tx_input_device: None,
+            bitrate_bps: 192000,
             rx_gain: 1.0,
             tx_gain: 1.0,
         }
@@ -367,6 +370,9 @@ impl ClientConfig {
         {
             return Err("[frontends.audio.bridge].tx_gain must be finite and >= 0".to_string());
         }
+        if self.frontends.audio.bridge.bitrate_bps == 0 {
+            return Err("[frontends.audio.bridge].bitrate_bps must be > 0".to_string());
+        }
         validate_tokens(
             "[frontends.http_json.auth].tokens",
             &self.frontends.http_json.auth.tokens,

src/trx-server/src/config.rs

@@ -267,7 +267,7 @@ impl Default for AudioConfig {
             sample_rate: 48000,
             channels: 1,
             frame_duration_ms: 20,
-            bitrate_bps: 24000,
+            bitrate_bps: 192000,
         }
     }
 }