FillFrameBuffer
virtual status_t FillFrameBuffer(BBuffer *buffer, bigtime_t *stamp=NULL);
err = fCamDevice->FillFrameBuffer(buffer, &stamp);
virtual status_t FillFrameBuffer(BBuffer *buffer, bigtime_t *stamp=NULL);
virtual status_t FillFrameBuffer(BBuffer *buffer,
int nDecodeRetVal = FillFrameBuffer();
int FillFrameBuffer();