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* Update along with the latest Vamp API change
author cannam
date Mon, 26 Feb 2007 18:12:19 +0000
parents 298dc5b79772
children
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Status of libxtract features implemented via vamp-libxtract.

A feature is described as "plausible" if it runs without crashing on a
test audio file in Sonic Visualiser and produces real valued results
that are not always zero and look (to the uneducated) as if they might
be in a sensible range.

A features is "suspect" if it returns results but they look like
they're all over the place.  Other failures are marked accordingly.  I
have no idea whether these fail in SV, the plugin, or the extraction
code.  The ones that seem to need investigating are marked with a *.

For simple features like mean, variance etc the plugin just extracts
the feature from the spectrum magnitudes of each block.

    MEAN		  Plausible
    VARIANCE		  Plausible
    STANDARD_DEVIATION	  Plausible
    AVERAGE_DEVIATION	  Plausible
    SKEWNESS		* Suspect
    KURTOSIS		* Suspect
    CENTROID		  Plausible
    IRREGULARITY_K	* All zeroes
    IRREGULARITY_J	* No data
    TRISTIMULUS_1	  Not implemented (no harmonic spectrum input)
    TRISTIMULUS_2	  Not implemented (no harmonic spectrum input)
    TRISTIMULUS_3	  Not implemented (no harmonic spectrum input)
    SMOOTHNESS		  Plausible
    SPREAD		  Plausible
    ZCR			  Plausible
    ROLLOFF		* Not sure (does produce some data)
    LOUDNESS		* Does not complete (wild value exposes SV bug?)
    FLATNESS		  Plausible
    TONALITY		  Not implemented (code looks wrong in scalar.c)
    CREST		  Not implemented in libxtract
    NOISINESS		  Not implemented in libxtract
    RMS_AMPLITUDE	  Plausible
    INHARMONICITY	* Fails to find fundamental frequencies in my test file
    POWER		  Not implemented in libxtract
    ODD_EVEN_RATIO	  Not implemented (no harmonic spectrum input)
    SHARPNESS		  Not implemented in libxtract
    SLOPE		  Not implemented in libxtract
    LOWEST_MATCH	  Not implemented
    HPS			  Not implemented (libxtract code says it doesn't work)
    F0			* Fails to find fundamental frequencies in my test file
    FLUX		  Not implemented in libxtract
    ATTACK_TIME		  Not implemented in libxtract
    DECAY_TIME		  Not implemented in libxtract
    DELTA_FEATURE	  Not implemented in libxtract
    AUTOCORRELATION	  Plausible (how should the output be represented?)
    AMDF		  Plausible (how should the output be represented?)
    ASDF		  Plausible (how should the output be represented?)
    BARK_COEFFICIENTS	  Plausible
    PEAKS		  Plausible
    MAGNITUDE_SPECTRUM	  Plausible
    AUTOCORRELATION_FFT	  Plausible (how should the output be represented?)
    MFCC		* All zeroes
    DCT			  Plausible