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fix(audio): defer MODE_IN_COMMUNICATION to call start, restore on end

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Root cause: MainActivity set MODE_IN_COMMUNICATION at app launch,
hijacking system audio routing immediately — BT A2DP music dropped to
earpiece, and the pre-existing communication mode confused subsequent
setCommunicationDevice calls for BT SCO.

Fix: MainActivity now only sets volumes. MODE_IN_COMMUNICATION is set
via JNI right before Oboe audio_start() in CallEngine, and MODE_NORMAL
is restored after audio_stop() when the call ends.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-04-12 17:29:59 +04:00
parent a37c8b30fe
commit 15c237ceea
3 changed files with 55 additions and 11 deletions
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34
desktop/src-tauri/src/android_audio.rs
View File

@@ -57,11 +57,37 @@ fn audio_manager<'local>(
Ok(am)
}
/// Set `AudioManager.MODE_IN_COMMUNICATION`. Call when a VoIP call starts.
/// This tells the audio policy to route through the communication device
/// path (earpiece/BT SCO) instead of the media path (speaker/BT A2DP).
pub fn set_audio_mode_communication() -> Result<(), String> {
let (vm, activity) = jvm_and_activity()?;
let mut env = vm
.attach_current_thread()
.map_err(|e| format!("attach_current_thread: {e}"))?;
let am = audio_manager(&mut env, &activity)?;
// MODE_IN_COMMUNICATION = 3
env.call_method(&am, "setMode", "(I)V", &[JValue::Int(3)])
.map_err(|e| format!("setMode(MODE_IN_COMMUNICATION): {e}"))?;
tracing::info!("AudioManager: mode set to MODE_IN_COMMUNICATION");
Ok(())
}
/// Restore `AudioManager.MODE_NORMAL`. Call when a VoIP call ends.
pub fn set_audio_mode_normal() -> Result<(), String> {
let (vm, activity) = jvm_and_activity()?;
let mut env = vm
.attach_current_thread()
.map_err(|e| format!("attach_current_thread: {e}"))?;
let am = audio_manager(&mut env, &activity)?;
// MODE_NORMAL = 0
env.call_method(&am, "setMode", "(I)V", &[JValue::Int(0)])
.map_err(|e| format!("setMode(MODE_NORMAL): {e}"))?;
tracing::info!("AudioManager: mode set to MODE_NORMAL");
Ok(())
}
/// Switch between loud speaker (`true`) and earpiece/handset (`false`).
///
/// Calls `AudioManager.setSpeakerphoneOn(on)` on the JVM. Requires that
/// the audio mode is already `MODE_IN_COMMUNICATION` — MainActivity.kt
/// sets this at startup, so by the time a call is up this is always true.
pub fn set_speakerphone(on: bool) -> Result<(), String> {
let (vm, activity) = jvm_and_activity()?;
let mut env = vm