Increase audio packet duration for low bandwidth connections

src/Limelight-internal.h

@@ -39,10 +39,14 @@ extern int AudioPacketDuration;
 
 #define UDP_RECV_POLL_TIMEOUT_MS 100
 
-// At this value, we will request high quality audio unless CAPABILITY_SLOW_OPUS_DECODER
+// At this value or above, we will request high quality audio unless CAPABILITY_SLOW_OPUS_DECODER
 // is set on the audio renderer.
 #define HIGH_AUDIO_BITRATE_THRESHOLD 15000
 
+// Below this value, we will request 20 ms audio frames to reduce bandwidth if the audio
+// renderer sets CAPABILITY_SUPPORTS_ARBITRARY_AUDIO_DURATION.
+#define LOW_AUDIO_BITRATE_TRESHOLD 5000
+
 int serviceEnetHost(ENetHost* client, ENetEvent* event, enet_uint32 timeoutMs);
 int extractVersionQuadFromString(const char* string, int* quad);
 int isReferenceFrameInvalidationEnabled(void);