Method and apparatus for a single codec

The present invention provides an intra prediction mode encoding method comprising: a prediction mode from a predetermined set of obtaining current intra prediction mode of intra-coded blocks; obtaining reference prediction mode of the current intra-coded block, the said reference prediction mode to the standby mode of the current reference intra-coded blocks available intra prediction mode of a neighboring block or preset prediction mode set; according to the reference prediction mode and the intra prediction mode, the code writing a first flag bit stream; when the intra-prediction mode encoding block and the prediction mode are not reference the same time, depending on the size relationship between the intra prediction mode and the reference prediction mode, the prediction mode encoding value is obtained , encoding of the prediction mode values ​​are encoded. Using the coding method provided by the invention, decision logic can save on the encoding side, to improve efficiency of encoding. The present invention also provides a corresponding decoding method and a decoding apparatus will.