$ tree -a com/
com/
└── termux
    └── api
        ├── AudioAPI.java
        ├── TermuxApiReceiver.java
        └── util
            ├── ResultReturner.java
            ├── TermuxApiLogger.java
            └── TermuxApiPermissionActivity.java

3 directories, 5 files

$ cat com/termux/api/TermuxApiReceiver.java
package com.termux.api;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

import com.termux.api.util.TermuxApiLogger;

public class TermuxApiReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String apiMethod = intent.getStringExtra("api_method");
        if (apiMethod == null) {
            TermuxApiLogger.error("Missing 'api_method' extra");
            return;
        }

        switch (apiMethod) {
            case "AudioInfo":
                AudioAPI.onReceive(this, context, intent);
                break;
            default:
                TermuxApiLogger.error("Unrecognized 'api_method' extra: '" + apiMethod + "'");
        }
    }

}

$ git diff com/termux/api/AudioAPI.java
diff --git a/app/src/main/java/com/termux/api/AudioAPI.java b/app/src/main/java/com/termux/api/AudioAPI.java
index acf87ed..7e13c2d 100644
--- a/app/src/main/java/com/termux/api/AudioAPI.java
+++ b/app/src/main/java/com/termux/api/AudioAPI.java
@@ -23,6 +23,7 @@ public class AudioAPI {
         final boolean bluetootha2dp = am.isBluetoothA2dpOn();
         final boolean wiredhs = am.isWiredHeadsetOn();
         final int nativeoutput = AudioTrack.getNativeOutputSampleRate(AudioManager.STREAM_MUSIC);
+       int _bs = 0;
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             AudioTrack at = new AudioTrack(
                 new AudioAttributes.Builder()
@@ -34,11 +35,12 @@ public class AudioAPI {
                 AudioTrack.MODE_STREAM,
                 AudioManager.AUDIO_SESSION_ID_GENERATE
             );
-            final int bs = at.getBufferSizeInFrames();
+            _bs = at.getBufferSizeInFrames();
             //final int bc = at.getBufferCapacityInFrames(); only available api 24 and up and apparently
             // always returns same value as the initial getbuffersizeinframes.
             at.release();
         }
+       final int bs = _bs;

         ResultReturner.returnData(apiReceiver, intent, new ResultReturner.ResultJsonWriter() {
             public void writeJson(JsonWriter out) throws Exception {

$ ecj com/
----------
1. WARNING in /data/data/com.termux/files/home/termux-api/app/src/main/java/com/termux/api/AudioAPI.java (at line 23)
        final boolean bluetootha2dp = am.isBluetoothA2dpOn();
                                         ^^^^^^^^^^^^^^^^^^^
The method isBluetoothA2dpOn() from the type AudioManager is deprecated
----------
2. WARNING in /data/data/com.termux/files/home/termux-api/app/src/main/java/com/termux/api/AudioAPI.java (at line 24)
        final boolean wiredhs = am.isWiredHeadsetOn();
                                   ^^^^^^^^^^^^^^^^^^
The method isWiredHeadsetOn() from the type AudioManager is deprecated
----------
2 problems (2 warnings)
$