DECODING METHOD, ENCODING METHOD, DECODER, AND ENCODER

Embodiments of the present application provide a decoding method, an encoding method, a decoder, and an encoder. The decoding method comprises: on the basis of the position of a current frame in a current grid, determining a decoding mode used for the current frame; on the basis of the decoding mode used for the current frame, decoding the current frame. In the present embodiment, the decoder determines the decoding mode used the current frame on the basis of the position of the current frame in the current grid, so that when the decoder determines the decoding mode used for the current frame, the position of the current frame can be considered, thereby improving the decoding performance of the decoder. In addition, since the position of the current frame does not need to be indicated in a code stream, the amount of information that needs to be decoded by the decoder can be reduced, that is, the decoding efficiency of the decoder can be improved while improving the decoding performance of the decoder. Des mod