| 摘要 |
A process that alleviates processor overloading, adaptively according to the current total processor load, by gracefully degrading video output quality, so that more jobs can be run simultaneously in a multitasking operating system environment is provided. The process reduces computation for video data decompression by substituting zero values for elements of one or more bottom rows of the matrix that is multiplied to a kernel matrix in the two-dimensional inverse discrete cosine transform. In one embodiment, a process is incorporated into an MPEG firmware as a part of library modules built into a multimedia signal processor integrated circuit, which runs a real-time multitasking operating system. If running an additional video decompression task will overload the processor, the operating system rejects running the task. When the additional video compression task is rejected, a degraded version, which will not overload the processor, of the original decompression task is submitted to the operating system.
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