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External Plugin: Filter-Type Plugin

The filter-type plugin is a plugin to convert the PCM signals from the input and feeds to the output. Thus, this plugin always needs a slave PCM as its output.

The plugin can modify the format and the channels of the input/output PCM. It can not modify the sample rate (because of simplicity reason).

External Plugin: I/O Plugin

The I/O-type plugin is a PCM plugin to work as the input or output terminal point, i.e. as a user-space PCM driver.
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