Added Ogg encoding to alternate API methods

libflac.go

@@ -512,6 +512,48 @@ func NewEncoderWriteSeeker(writer FlacWriter, channels int, depth int, rate int,
 	return
 }
 
+// NewEncoderWriteSeekerOgg creates a new Encoder object from a FlacWriter.
+func NewEncoderWriteSeekerOgg(writer FlacWriter, channels int, depth int, rate int, compressionLevel int, streamable bool, blockSize 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)
+	e.writer = writer
+	e.writeSeeker = writer
+	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))
+	C.FLAC__stream_encoder_set_compression_level(e.e, C.uint(compressionLevel))
+	C.FLAC__stream_encoder_set_blocksize(e.e, C.uint(blockSize))
+	if streamable {
+		C.FLAC__stream_encoder_set_streamable_subset(e.e, C.FLAC__bool(1))
+	} else {
+		C.FLAC__stream_encoder_set_streamable_subset(e.e, C.FLAC__bool(0))
+	}
+	status := C.FLAC__stream_encoder_init_ogg_stream(e.e,
+		(C.FLAC__StreamEncoderWriteCallback)(unsafe.Pointer(C.encoderWriteCallback_cgo)),
+		(C.FLAC__StreamEncoderSeekCallback)(unsafe.Pointer(C.encoderSeekCallback_cgo)),
+		(C.FLAC__StreamEncoderTellCallback)(unsafe.Pointer(C.encoderTellCallback_cgo)),
+		nil, nil)
+	if status != C.FLAC__STREAM_ENCODER_INIT_STATUS_OK {
+		return nil, fmt.Errorf("failed to open file, status = %d, state = %d", int(status), int(C.FLAC__stream_encoder_get_state(e.e)))
+	}
+	e.Channels = channels
+	e.Depth = depth
+	e.Rate = rate
+	return
+}
+
 // NewEncoderWriter creates a new Encoder object from an io.WriteCloser.
 func NewEncoderWriter(writer io.WriteCloser, channels int, depth int, rate int, compressionLevel int, streamable bool, blockSize int) (e *Encoder, err error) {
 	if channels == 0 {
@@ -552,6 +594,46 @@ func NewEncoderWriter(writer io.WriteCloser, channels int, depth int, rate int,
 	return
 }
 
+// NewEncoderWriterOgg creates a new Encoder object from an io.WriteCloser.
+func NewEncoderWriterOgg(writer io.WriteCloser, channels int, depth int, rate int, compressionLevel int, streamable bool, blockSize 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)
+	e.writer = writer
+	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))
+	C.FLAC__stream_encoder_set_compression_level(e.e, C.uint(compressionLevel))
+	C.FLAC__stream_encoder_set_blocksize(e.e, C.uint(blockSize))
+	if streamable {
+		C.FLAC__stream_encoder_set_streamable_subset(e.e, C.FLAC__bool(1))
+	} else {
+		C.FLAC__stream_encoder_set_streamable_subset(e.e, C.FLAC__bool(0))
+	}
+	status := C.FLAC__stream_encoder_init_ogg_stream(e.e,
+		(C.FLAC__StreamEncoderWriteCallback)(unsafe.Pointer(C.encoderWriteCallback_cgo)),
+		nil,
+		nil,
+		nil, nil)
+	if status != C.FLAC__STREAM_ENCODER_INIT_STATUS_OK {
+		return nil, fmt.Errorf("failed to open file, status = %d, state = %d", int(status), int(C.FLAC__stream_encoder_get_state(e.e)))
+	}
+	e.Channels = channels
+	e.Depth = depth
+	e.Rate = rate
+	return
+}
+
 // WriteFrame writes a frame of audio data to the encoder.
 func (e *Encoder) WriteFrame(f Frame) (err error) {
 	if f.Channels != e.Channels || f.Depth != e.Depth || f.Rate != e.Rate {