Add toggle to control call bandwidth.

app/src/main/java/org/thoughtcrime/securesms/webrtc/CallBandwidthMode.java

@@ -0,0 +1,40 @@
+package org.thoughtcrime.securesms.webrtc;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+
+import org.signal.core.util.logging.Log;
+import org.signal.ringrtc.CallException;
+import org.thoughtcrime.securesms.keyvalue.SignalStore;
+import org.thoughtcrime.securesms.util.NetworkUtil;
+
+/**
+ * Represents the user's desired bandwidth mode for calls.
+ */
+public enum CallBandwidthMode {
+  LOW_ALWAYS(0),
+  HIGH_ON_WIFI(1),
+  HIGH_ALWAYS(2);
+
+  private final int code;
+
+  CallBandwidthMode(int code) {
+    this.code = code;
+  }
+
+  public int getCode() {
+    return code;
+  }
+
+  public static CallBandwidthMode fromCode(int code) {
+    switch (code) {
+      case 1:
+        return HIGH_ON_WIFI;
+      case 2:
+        return HIGH_ALWAYS;
+      default:
+        return LOW_ALWAYS;
+    }
+  }
+}