// DefaultOutputDevice returns information for the default
// output device on the system.
func DefaultOutputDevice() (*DeviceInfo, error) {
devs, err := Devices()
if err != nil {
return nil, err
}
i := C.Pa_GetDefaultOutputDevice()
if i < 0 {
return nil, newError(C.PaError(i))
}
return devs[i], nil
}
func OpenStream(inOpts *InputOptions,
outOpts *OutputOptions,
sampleRate float64) (strm *Stream, err error) {
// initialize return value first
strm = new(Stream)
strm.inopts = inOpts
strm.outopts = outOpts
// initialize in and out
var _inopts *C.PaStreamParameters
var _outopts *C.PaStreamParameters
if inOpts != nil {
_inopts = new(C.PaStreamParameters)
_inopts.device = C.Pa_GetDefaultInputDevice()
if inOpts.DeviceID != DefaultDevice {
_inopts.device = C.PaDeviceIndex(inOpts.DeviceID)
}
_inopts.channelCount = C.int(inOpts.ChannelCnt)
_inopts.sampleFormat = C.paFloat32
_inopts.suggestedLatency = C.Pa_GetDeviceInfo(_inopts.device).defaultHighInputLatency
_inopts.hostApiSpecificStreamInfo = nil
}
if outOpts != nil {
_outopts = new(C.PaStreamParameters)
_outopts.device = C.Pa_GetDefaultOutputDevice()
if outOpts.DeviceID != DefaultDevice {
_outopts.device = C.PaDeviceIndex(outOpts.DeviceID)
}
_outopts.channelCount = C.int(outOpts.ChannelCnt)
_outopts.sampleFormat = C.paFloat32
_outopts.suggestedLatency = C.Pa_GetDeviceInfo(_outopts.device).defaultHighOutputLatency
_outopts.hostApiSpecificStreamInfo = nil
}
cerr := C.Pa_OpenStream(
&strm.cee,
_inopts,
_outopts,
C.double(sampleRate),
C.paClipOff,
0,
nil,
nil,
)
if cerr != C.paNoError {
err = errors.New(C.GoString(C.Pa_GetErrorText(cerr)))
return
}
cerr = C.Pa_StartStream(strm.cee)
if cerr != C.paNoError {
err = errors.New(C.GoString(C.Pa_GetErrorText(cerr)))
return
}
return
}
// GetDefaultOutputDevice function as declared in portaudio/portaudio.h:398
func GetDefaultOutputDevice() DeviceIndex {
__ret := C.Pa_GetDefaultOutputDevice()
__v := (DeviceIndex)(__ret)
return __v
}