Intelligent window code stream rising and falling method based on large screen decoding capability

The invention discloses an intelligent window code stream ascending and descending method based on large-screen decoding capability, relates to the technical field of image processing, and provides a scheme for overcoming the defects that hardware stream selection can only appoint one code stream to use and code stream information cannot be dynamically allocated according to global information, and the method comprises the following steps: S1, selecting a code stream for calculation; s2, recording a current snapshot; s3, cutting into a plurality of window fragments, and calculating a window display area on each display screen; s4, the window fragments on each display screen preferentially occupy the layer in sequence; s5, a window is initialized, and the lowest-level code stream is used; s6, upgrading the code stream step by step, then judging whether the code stream continues to be upgraded, if not, ending the upgrading of the code stream, and if yes, continuing to upgrade the code stream; and S7, comparing