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).
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.
Generated on Fri May 27 10:37:26 2005 for ALSA project - the C library reference by
1.4.2