use low complexity CELT encoder mode

src/client.cpp

@@ -48,6 +48,12 @@ CClient::CClient ( const quint16 iPortNumber ) :
     CeltEncoder = celt_encoder_create ( CeltMode );
     CeltDecoder = celt_decoder_create ( CeltMode );
 
+#ifdef USE_LOW_COMPLEXITY_CELT_ENC
+    // set encoder low complexity
+    celt_encoder_ctl(CeltEncoder,
+        CELT_SET_COMPLEXITY_REQUEST, celt_int32_t ( 1 ) );
+#endif
+
 
     // connections -------------------------------------------------------------
     // connection for protocol

src/global.h

@@ -73,6 +73,9 @@
 #define FRAME_SIZE_FACTOR_DEFAULT       2 // 256 (for frame size 128)
 #define FRAME_SIZE_FACTOR_SAFE          4 // 512 (for frame size 128)
 
+// low complexity CELT encoder (if defined)
+#define USE_LOW_COMPLEXITY_CELT_ENC
+
 // define the maximum mono audio buffer size at a sample rate
 // of 48 kHz, this is important for defining the maximum number
 // of bytes to be expected from the network interface

src/server.cpp

@@ -122,6 +122,12 @@ CServer::CServer ( const QString& strLoggingFileName,
 
         CeltEncoder[i] = celt_encoder_create ( CeltMode[i] );
         CeltDecoder[i] = celt_decoder_create ( CeltMode[i] );
+
+#ifdef USE_LOW_COMPLEXITY_CELT_ENC
+        // set encoder low complexity
+        celt_encoder_ctl(CeltEncoder[i],
+            CELT_SET_COMPLEXITY_REQUEST, celt_int32_t ( 1 ) );
+#endif
     }
 
     // define colors for chat window identifiers