func (d *Decoder) Decode(data []byte, frameSize int, fec bool) ([]int16, error) {
var dataPtr *C.uchar
if len(data) > 0 {
dataPtr = (*C.uchar)(unsafe.Pointer(&data[0]))
}
dataLen := C.opus_int32(len(data))
output := make([]int16, d.channels*frameSize)
outputPtr := (*C.opus_int16)(unsafe.Pointer(&output[0]))
var cFec C.int
if fec {
cFec = 1
} else {
cFec = 0
}
cRet := C.opus_decode(d.cDecoder, dataPtr, dataLen, outputPtr, C.int(frameSize), cFec)
ret := int(cRet)
if ret < 0 {
return nil, getErr(cRet)
}
return output[:ret*d.channels], nil
}
// Decode encoded Opus data into the supplied buffer. On success, returns the
// number of samples correctly written to the target buffer.
func (dec *Decoder) Decode(data []byte, pcm []int16) (int, error) {
if dec.p == nil {
return 0, errDecUninitialized
}
if len(data) == 0 {
return 0, fmt.Errorf("opus: no data supplied")
}
if len(pcm) == 0 {
return 0, fmt.Errorf("opus: target buffer empty")
}
n := int(C.opus_decode(
dec.p,
(*C.uchar)(&data[0]),
C.opus_int32(len(data)),
(*C.opus_int16)(&pcm[0]),
C.int(cap(pcm)),
0))
if n < 0 {
return 0, opuserr(n)
}
return n, nil
}