Plugins that have the capability flag HWPLUG_CAPS_SAVESAMPLE set can register
one or more additional output sample formats. The user will then be able to save samples
in the output formats supported by the plugin. Plugins have to register new output
sample formats by passing the name of a constant that should be used to access the new format.
For example, a plugin might choose to register a new output sample format under the
constant #SMPFMT_CUSTOMFORMAT. Whenever the user calls SaveSample()
now and passes #SMPFMT_CUSTOMFORMAT as the sample format, Hollywood will ask the plugin to
save the sample.