Method, device and terminal for decoding

A decoder for regulating a power, comprising a processor for executing program codes stored in a memory, to implement:

• a power determining module configured to determine an expected power;
• and to determine a first average power of the decoder according to a cumulative decoding time and the cumulative electrical quantity consumption of the decoder from a moment when the decoder starts working to a current moment, and to determine a second average power of the decoder according to a cumulative decoding time length and a cumulative electrical quantity consumption in the process of decoding a latest preset number of image groups decoded by the decoder;
• a mode determining module configured to determine an operation mode of the decoder according to a comparison result between the expected power and the first average power, in the case that the absolute value of the difference between the expected power and the second average power exceeds a preset threshold and the expected power is not equal to the first average power, wherein different modes of the decoder corresponds to different powers of the decoder;
• and
• an inter-frame predicting module, a deblocking filtering module and a residual processing module which are configured to decode a data frame according to the determined operation mode,
• wherein if the expected power is smaller than the first average power and the current operation mode of the decoder is not a simplified decoding mode, the mode determining module configures the decoder to operate in a first decoding mode, and
• if the expected power is greater than the first average power and the current operation mode of the decoder is the simplified decoding mode, the mode determining module configures the decoder to operate in a second decoding mode.