func NewEncoder(sampleRate, channels int, application Application) (*Encoder, error) {
encoder := &Encoder{}
encoder.data = make([]byte, int(C.opus_encoder_get_size(C.int(channels))))
encoder.cEncoder = (*C.struct_OpusEncoder)(unsafe.Pointer(&encoder.data[0]))
ret := C.opus_encoder_init(encoder.cEncoder, C.opus_int32(sampleRate), C.int(channels), C.int(application))
if err := getErr(ret); err != nil {
return nil, err
}
return encoder, nil
}
// 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 {
if enc.p != nil {
return fmt.Errorf("opus encoder already initialized")
}
if channels != 1 && channels != 2 {
return fmt.Errorf("Number of channels must be 1 or 2: %d", channels)
}
size := C.opus_encoder_get_size(C.int(channels))
enc.mem = make([]byte, size)
enc.p = (*C.OpusEncoder)(unsafe.Pointer(&enc.mem[0]))
errno := int(C.opus_encoder_init(
enc.p,
C.opus_int32(sample_rate),
C.int(channels),
C.int(application)))
if errno != 0 {
return opuserr(int(errno))
}
return nil
}