unsafe extern "C" fn audiosink_prepare<T: AudioSinkImpl>(
ptr: *mut GstAudioSink,
spec: *mut GstAudioRingBufferSpec,
) -> gbooleanunsafe extern "C" fn audiosink_prepare<T: AudioSinkImpl>(
ptr: *mut GstAudioSink,
spec: *mut GstAudioRingBufferSpec,
) -> gboolean