func NewDecoder(sampleRate, channels int) (*Decoder, error) {
decoder := &Decoder{}
decoder.data = make([]byte, int(C.opus_decoder_get_size(C.int(channels))))
decoder.cDecoder = (*C.struct_OpusDecoder)(unsafe.Pointer(&decoder.data[0]))
ret := C.opus_decoder_init(decoder.cDecoder, C.opus_int32(sampleRate), C.int(channels))
if err := getErr(ret); err != nil {
return nil, err
}
decoder.channels = channels
return decoder, nil
}
func (dec *Decoder) Init(sample_rate int, channels int) error {
if dec.p != nil {
return fmt.Errorf("opus decoder already initialized")
}
if channels != 1 && channels != 2 {
return fmt.Errorf("Number of channels must be 1 or 2: %d", channels)
}
size := C.opus_decoder_get_size(C.int(channels))
dec.sample_rate = sample_rate
dec.mem = make([]byte, size)
dec.p = (*C.OpusDecoder)(unsafe.Pointer(&dec.mem[0]))
errno := C.opus_decoder_init(
dec.p,
C.opus_int32(sample_rate),
C.int(channels))
if errno != 0 {
return opuserr(int(errno))
}
return nil
}