Added support for Ogg encoding

libflac.go

@@ -393,6 +393,36 @@ func NewEncoder(name string, channels int, depth int, rate int) (e *Encoder, err
 	return
 }
 
+// NewEncoderOgg creates a new Encoder object.
+func NewEncoderOgg(name string, channels int, depth int, rate int) (e *Encoder, err error) {
+	if channels == 0 {
+		return nil, errors.New("channels must be greater than 0")
+	}
+	if !(depth == 16 || depth == 24) {
+		return nil, errors.New("depth must be 16 or 24")
+	}
+	e = new(Encoder)
+	e.e = C.FLAC__stream_encoder_new()
+	if e.e == nil {
+		return nil, errors.New("failed to create decoder")
+	}
+	encoderPtrs.add(e)
+	c := C.CString(name)
+	defer C.free(unsafe.Pointer(c))
+	runtime.SetFinalizer(e, (*Encoder).Close)
+	C.FLAC__stream_encoder_set_channels(e.e, C.uint(channels))
+	C.FLAC__stream_encoder_set_bits_per_sample(e.e, C.uint(depth))
+	C.FLAC__stream_encoder_set_sample_rate(e.e, C.uint(rate))
+	status := C.FLAC__stream_encoder_init_ogg_file(e.e, c, nil, nil)
+	if status != C.FLAC__STREAM_ENCODER_INIT_STATUS_OK {
+		return nil, errors.New("failed to open file")
+	}
+	e.Channels = channels
+	e.Depth = depth
+	e.Rate = rate
+	return
+}
+
 //export encoderWriteCallback
 func encoderWriteCallback(e *C.FLAC__StreamEncoder, buffer *C.FLAC__byte, bytes C.size_t, samples, current_frame C.unsigned, data unsafe.Pointer) C.FLAC__StreamEncoderWriteStatus {
 	encoder := encoderPtrs.get(e)

libflac_test.go

@@ -237,6 +237,37 @@ func TestEncode(t *testing.T) {
 	os.Remove(fileName)
 }
 
+func TestEncodeOgg(t *testing.T) {
+	a := assert.New(t)
+
+	e, err := NewEncoder("not-existdir/foo.ogg", 2, 24, 48000)
+	a.Equal(e, (*Encoder)(nil), "encoder is nil")
+	a.NotNil(err, "err is not nil")
+
+	fileName := "testdata/test.ogg"
+
+	e, err = NewEncoder(fileName, 2, 24, 48000)
+
+	a.Equal(err, nil, "err is nil")
+
+	f := Frame{Channels: 1, Depth: 24, Rate: 48000}
+
+	err = e.WriteFrame(f)
+
+	a.Error(err, "channels mismatch")
+
+	f.Channels = 2
+	f.Buffer = make([]int32, 2*100)
+
+	err = e.WriteFrame(f)
+
+	a.Equal(err, nil, "frame encoded")
+
+	e.Close()
+
+	os.Remove(fileName)
+}
+
 func TestRoundTrip(t *testing.T) {
 	a := assert.New(t)