About the Vamp Test Plugin¶

The Vamp Test Plugin is a plugin that does no real work, does not analyse its input at all, and always returns the same results. (With one caveat: you should feed it at least 15 seconds of input audio, because it returns features across a 15-second span.)

It has several outputs, which are designed to test the host's handling of various aspects of the Vamp OutputDescriptor SampleType and SampleRate settings. Note that all output features have labels indicating the expected timing and (in some cases) values for the feature.

Think of it as the Vamp plugin equivalent of a TV test pattern or printer test page.

Outputs¶

The plugin has the following outputs:

instants¶

The instants output is a VariableSampleRate output containing ten instants explicitly timestamped at 1.5 second intervals. They are labelled by number and time.

"test.wav",0.000000000,"1 of 10 at 0" 
,1.500000000,"2 of 10 at 1.5" 
,3.000000000,"3 of 10 at 3" 
,4.500000000,"4 of 10 at 4.5" 
,6.000000000,"5 of 10 at 6" 
,7.500000000,"6 of 10 at 7.5" 
,9.000000000,"7 of 10 at 9" 
,10.500000000,"8 of 10 at 10.5" 
,12.000000000,"9 of 10 at 12" 
,13.500000000,"10 of 10 at 13.5" 

curve-oss¶

The curve-oss output is a OneSamplePerStep output containing 20 values from 0 to 0.95 in increments of 0.05. They have implicit timing, so their timestamps will depend on the process block size. The expected times are calculated by the plugin and returned in the feature labels.

"test.wav",0.000000000,0,"1 of 20: 0 at 0" 
,0.023219954,0.05,"2 of 20: 0.05 at 0.023" 
,0.046439909,0.1,"3 of 20: 0.1 at 0.046" 
,0.069659863,0.15,"4 of 20: 0.15 at 0.069" 
,0.092879818,0.2,"5 of 20: 0.2 at 0.092" 
,0.116099773,0.25,"6 of 20: 0.25 at 0.116" 
,0.139319727,0.3,"7 of 20: 0.3 at 0.139" 
,0.162539682,0.35,"8 of 20: 0.35 at 0.162" 
,0.185759637,0.4,"9 of 20: 0.4 at 0.185" 
,0.208979591,0.45,"10 of 20: 0.45 at 0.208" 
,0.232199546,0.5,"11 of 20: 0.5 at 0.232" 
,0.255419501,0.55,"12 of 20: 0.55 at 0.255" 
,0.278639455,0.6,"13 of 20: 0.6 at 0.278" 
,0.301859410,0.65,"14 of 20: 0.65 at 0.301" 
,0.325079365,0.7,"15 of 20: 0.7 at 0.325" 
,0.348299319,0.75,"16 of 20: 0.75 at 0.348" 
,0.371519274,0.8,"17 of 20: 0.8 at 0.371" 
,0.394739229,0.85,"18 of 20: 0.85 at 0.394" 
,0.417959183,0.9,"19 of 20: 0.9 at 0.417" 
,0.441179138,0.95,"20 of 20: 0.95 at 0.441"