| 摘要 |
Media processing in software can be used for consumer terminals like digital television sets or set-top boxes. For reasons of cost-effectiveness, the average processor utilization must be high. This is mostly achieved by allocating below worst-case processor budgets to tasks performing media processing operations. Only if a stable output quality is a primary requirement, a task gets allocated a worst-case processor budget. To gain back on the cost-effectiveness in such a situation, a method and a system are provided to reallocate an unused part of a budget (212) from a first task (taum) with a worst-case budget to a second task (taup) with a below worst-case budget. The second task (taup) may then use the resulting budget surplus (216) to improve the quality of its output. The method and system operate at a very low level, in the scheduling of the tasks performing the media processing. What effectively happens is that the second task (taup) gets executed in the place of the first task (taum), as if it were the first task (taum), with scheduling characteristics such as period and priority of the first task (taum).
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