diff --git a/encoder.go b/encoder.go
index a9ced73..04a0d54 100644
--- a/encoder.go
+++ b/encoder.go
@@ -34,6 +34,56 @@ bridge_encoder_get_sample_rate(OpusEncoder *st)
 	opus_encoder_ctl(st, OPUS_GET_SAMPLE_RATE(&sample_rate));
 	return sample_rate;
 }
+
+opus_int32
+set_bitrate(OpusEncoder *st, opus_int32 bitrate)
+{
+	opus_int32 res;
+	res = opus_encoder_ctl(st, OPUS_SET_BITRATE(bitrate));
+	return res;
+}
+
+opus_int32
+get_bitrate(OpusEncoder *st, opus_int32 *bitrate)
+{
+	int res;
+	res = opus_encoder_ctl(st, OPUS_GET_BITRATE(bitrate));
+	return res;
+}
+
+opus_int32
+set_complexity(OpusEncoder *st, opus_int32 complexity)
+{
+	opus_int32 res;
+	res = opus_encoder_ctl(st, OPUS_SET_COMPLEXITY(complexity));
+	return res;
+}
+
+opus_int32
+get_complexity(OpusEncoder *st, opus_int32 *complexity)
+{
+	int res;
+	res = opus_encoder_ctl(st, OPUS_GET_COMPLEXITY(complexity));
+	return res;
+}
+
+opus_int32
+set_max_bandwidth(OpusEncoder *st, opus_int32 max_bw)
+{
+	opus_int32 res;
+	res = opus_encoder_ctl(st, OPUS_SET_MAX_BANDWIDTH(max_bw));
+	return res;
+}
+
+opus_int32
+get_max_bandwidth(OpusEncoder *st, opus_int32 *max_bw)
+{
+	int res;
+	res = opus_encoder_ctl(st, OPUS_GET_MAX_BANDWIDTH(max_bw));
+	return res;
+}
+
+
 */
 import "C"
 
@@ -50,7 +100,7 @@ type Encoder struct {
 
 // NewEncoder allocates a new Opus encoder and initializes it with the
 // appropriate parameters. All related memory is managed by the Go GC.
-func NewEncoder(sample_rate int, channels int, application Application) (*Encoder, error) {
+func NewEncoder(sample_rate int, channels int, application int) (*Encoder, error) {
 	var enc Encoder
 	err := enc.Init(sample_rate, channels, application)
 	if err != nil {
@@ -62,7 +112,7 @@ func NewEncoder(sample_rate int, channels int, application Application) (*Encode
 // Init initializes a pre-allocated opus encoder. Unless the encoder has been
 // created using NewEncoder, this method must be called exactly once in the
 // life-time of this object, before calling any other methods.
-func (enc *Encoder) Init(sample_rate int, channels int, application Application) error {
+func (enc *Encoder) Init(sample_rate int, channels int, application int) error {
 	if enc.p != nil {
 		return fmt.Errorf("opus encoder already initialized")
 	}
@@ -162,3 +212,61 @@ func (enc *Encoder) DTX() bool {
 func (enc *Encoder) SampleRate() int {
 	return int(C.bridge_encoder_get_sample_rate(enc.p))
 }
+
+// SetBitrate sets the bitrate of the Encoder
+func (enc *Encoder) SetBitrate(bitrate int) error {
+	res := int(C.set_bitrate(enc.p, C.opus_int32(bitrate)))
+	if res < 0 {
+		return opusError(res)
+	}
+	return nil
+}
+
+// Bitrate returns the bitrate of the Encoder
+func (enc *Encoder) Bitrate() (int, error) {
+	var bitrate C.opus_int32
+	res := int(C.get_bitrate(enc.p, &bitrate))
+	if res < 0 {
+		return 0, opusError(res)
+	}
+	return int(bitrate), nil
+}
+
+// SetComplexity sets the encoder's computational complexity
+func (enc *Encoder) SetComplexity(complexity int) error {
+	res := int(C.set_complexity(enc.p, C.opus_int32(complexity)))
+	if res < 0 {
+		return opusError(res)
+	}
+	return nil
+}
+
+// Complexity returns the bitrate of the Encoder
+func (enc *Encoder) Complexity() (int, error) {
+	var complexity C.opus_int32
+	res := int(C.get_complexity(enc.p, &complexity))
+	if res < 0 {
+		return 0, opusError(res)
+	}
+	return int(complexity), nil
+}
+
+// SetMaxBandwidth configures the maximum bandpass that the encoder will select
+// automatically
+func (enc *Encoder) SetMaxBandwidth(maxBw int) error {
+	res := int(C.set_max_bandwidth(enc.p, C.opus_int32(maxBw)))
+	if res < 0 {
+		return opusError(res)
+	}
+	return nil
+}
+
+// MaxBandwidth gets the encoder's configured maximum allowed bandpass.
+func (enc *Encoder) MaxBandwidth() (int, error) {
+	var maxBw C.opus_int32
+	res := int(C.get_max_bandwidth(enc.p, &maxBw))
+	if res < 0 {
+		return 0, opusError(res)
+	}
+	return int(maxBw), nil
+}
diff --git a/encoder_test.go b/encoder_test.go
index 527a5e3..785001e 100644
--- a/encoder_test.go
+++ b/encoder_test.go
@@ -1,10 +1,8 @@
-// Copyright © 2015, 2016 Authors (see AUTHORS file)
-//
-// License for use of this code is detailed in the LICENSE file
-
 package opus
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestEncoderNew(t *testing.T) {
 	enc, err := NewEncoder(48000, 1, APPLICATION_VOIP)
@@ -57,3 +55,118 @@ func TestEncoderSampleRate(t *testing.T) {
 		}
 	}
 }
+
+func TestEncoder_SetGetBitrate(t *testing.T) {
+	enc, err := NewEncoder(8000, 1, APPLICATION_AUDIO)
+	if err != nil || enc == nil {
+		t.Errorf("Error creating new encoder: %v", err)
+	}
+	vals := []int{500, 100000, 300000}
+	for _, bitrate := range vals {
+		err := enc.SetBitrate(bitrate)
+		if err != nil {
+			t.Error("Error set bitrate:", err)
+		}
+		br, err := enc.Bitrate()
+		if err != nil {
+			t.Error("Error getting bitrate", err)
+		}
+		if br != bitrate {
+			t.Errorf("Unexpected bitrate. Got %d, but expected %d", br, bitrate)
+		}
+	}
+}
+
+func TestEncoder_SetGetInvalidBitrate(t *testing.T) {
+	enc, err := NewEncoder(8000, 1, APPLICATION_AUDIO)
+	if err != nil || enc == nil {
+		t.Errorf("Error creating new encoder: %v", err)
+	}
+	invalidVals := []int{-20, 0}
+	for _, bitrate := range invalidVals {
+		err := enc.SetBitrate(bitrate)
+		if err == nil {
+			t.Errorf("Expected Error invalid bitrate: %d", bitrate)
+		}
+		br, err := enc.Bitrate()
+		if err != nil {
+			t.Error("Error getting bitrate", err)
+		}
+		// default bitrate is 32 kbit/s
+		if br != 32000 {
+			t.Errorf("Unexpected bitrate. Got %d, but expected %d", br, bitrate)
+		}
+	}
+}
+
+func TestEncoder_SetGetComplexity(t *testing.T) {
+	enc, err := NewEncoder(8000, 1, APPLICATION_AUDIO)
+	if err != nil || enc == nil {
+		t.Errorf("Error creating new encoder: %v", err)
+	}
+	vals := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+	for _, complexity := range vals {
+		err := enc.SetComplexity(complexity)
+		if err != nil {
+			t.Error("Error setting complexity value:", err)
+		}
+		cpx, err := enc.Complexity()
+		if err != nil {
+			t.Error("Error getting complexity value", err)
+		}
+		if cpx != complexity {
+			t.Errorf("Unexpected encoder complexity value. Got %d, but expected %d",
+				cpx, complexity)
+		}
+	}
+}
+
+func TestEncoder_SetGetInvalidComplexity(t *testing.T) {
+	enc, err := NewEncoder(8000, 1, APPLICATION_AUDIO)
+	if err != nil || enc == nil {
+		t.Errorf("Error creating new encoder: %v", err)
+	}
+	invalidVals := []int{-20, 11, 1000}
+	for _, complexity := range invalidVals {
+		err := enc.SetComplexity(complexity)
+		if err == nil {
+			t.Errorf("Expected Error invalid complexity value: %d", complexity)
+		}
+		cpx, err := enc.Complexity()
+		if err != nil {
+			t.Error("Error getting complexity value", err)
+		}
+		// default complexity value is 9
+		if cpx != 9 {
+			t.Errorf("Unexpected complexity value. Got %d, but expected %d",
+				cpx, complexity)
+		}
+	}
+}
+
+func TestEncoder_SetGetMaxBandwidth(t *testing.T) {
+	enc, err := NewEncoder(8000, 1, APPLICATION_AUDIO)
+	if err != nil || enc == nil {
+		t.Errorf("Error creating new encoder: %v", err)
+	}
+	vals := []int{OPUS_BANDWIDTH_NARROWBAND,
+		OPUS_BANDWIDTH_MEDIUMBAND,
+		OPUS_BANDWIDTH_WIDEBAND,
+		OPUS_BANDWIDTH_SUPERWIDEBAND,
+		OPUS_BANDWIDTH_FULLBAND,
+	}
+	for _, maxBw := range vals {
+		err := enc.SetMaxBandwidth(maxBw)
+		if err != nil {
+			t.Error("Error setting max Bandwidth:", err)
+		}
+		maxBwRead, err := enc.MaxBandwidth()
+		if err != nil {
+			t.Error("Error getting max Bandwidth", err)
+		}
+		if maxBwRead != maxBw {
+			t.Errorf("Unexpected max Bandwidth value. Got %d, but expected %d",
+				maxBwRead, maxBw)
+		}
+	}
+}
diff --git a/opus.go b/opus.go
index 7bba634..b4835df 100644
--- a/opus.go
+++ b/opus.go
@@ -16,17 +16,27 @@ const int CONST_APPLICATION_RESTRICTED_LOWDELAY = OPUS_APPLICATION_RESTRICTED_LO
 */
 import "C"
 
-type Application int
-
-// These variables should be constants, but for interoperability with CGO
-// they're var. Don't change them, though!
-var (
+const (
 	// Optimize encoding for VOIP
-	APPLICATION_VOIP = Application(C.CONST_APPLICATION_VOIP)
+	APPLICATION_VOIP = C.OPUS_APPLICATION_VOIP
 	// Optimize encoding for non-voice signals like music
-	APPLICATION_AUDIO = Application(C.CONST_APPLICATION_AUDIO)
+	APPLICATION_AUDIO = C.OPUS_APPLICATION_AUDIO
 	// Optimize encoding for low latency applications
-	APPLICATION_RESTRICTED_LOWDELAY = Application(C.CONST_APPLICATION_RESTRICTED_LOWDELAY)
+	APPLICATION_RESTRICTED_LOWDELAY = C.OPUS_APPLICATION_RESTRICTED_LOWDELAY
+	// Auto bitrate
+	OPUS_AUTO = C.OPUS_AUTO
+	// Maximum bitrate
+	OPUS_BITRATE_MAX = C.OPUS_BITRATE_MAX
+	//4 kHz passband
+	OPUS_BANDWIDTH_NARROWBAND = C.OPUS_BANDWIDTH_NARROWBAND
+	// 6 kHz passband
+	OPUS_BANDWIDTH_MEDIUMBAND = C.OPUS_BANDWIDTH_MEDIUMBAND
+	// 8 kHz passband
+	OPUS_BANDWIDTH_WIDEBAND = C.OPUS_BANDWIDTH_WIDEBAND
+	// 12 kHz passband
+	OPUS_BANDWIDTH_SUPERWIDEBAND = C.OPUS_BANDWIDTH_SUPERWIDEBAND
+	// 20 kHz passband
+	OPUS_BANDWIDTH_FULLBAND = C.OPUS_BANDWIDTH_FULLBAND
 )
 
 const (