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1
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2 Status of libxtract features implemented via vamp-libxtract.
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3
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4 A feature is described as "plausible" if it runs without crashing on a
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5 test audio file in Sonic Visualiser and produces real valued results
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6 that are not always zero and look (to the uneducated) as if they might
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7 be in a sensible range.
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8
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9 A features is "suspect" if it returns results but they look like
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10 they're all over the place. Other failures are marked accordingly. I
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11 have no idea whether these fail in SV, the plugin, or the extraction
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12 code. The ones that seem to need investigating are marked with a *.
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13
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14 For simple features like mean, variance etc the plugin just extracts
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15 the feature from the spectrum magnitudes of each block.
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16
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17 MEAN Plausible
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18 VARIANCE Plausible
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19 STANDARD_DEVIATION Plausible
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20 AVERAGE_DEVIATION Plausible
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21 SKEWNESS * Suspect
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22 KURTOSIS * Suspect
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23 CENTROID Plausible
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24 IRREGULARITY_K * All zeroes
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25 IRREGULARITY_J * No data
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26 TRISTIMULUS_1 Not implemented (no harmonic spectrum input)
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27 TRISTIMULUS_2 Not implemented (no harmonic spectrum input)
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28 TRISTIMULUS_3 Not implemented (no harmonic spectrum input)
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29 SMOOTHNESS Plausible
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30 SPREAD Plausible
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31 ZCR Plausible
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32 ROLLOFF * Not sure (does produce some data)
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33 LOUDNESS * Does not complete (wild value exposes SV bug?)
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34 FLATNESS Plausible
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35 TONALITY Not implemented (code looks wrong in scalar.c)
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36 CREST Not implemented in libxtract
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37 NOISINESS Not implemented in libxtract
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38 RMS_AMPLITUDE Plausible
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39 INHARMONICITY * Fails to find fundamental frequencies in my test file
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40 POWER Not implemented in libxtract
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41 ODD_EVEN_RATIO Not implemented (no harmonic spectrum input)
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42 SHARPNESS Not implemented in libxtract
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43 SLOPE Not implemented in libxtract
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44 LOWEST_MATCH Not implemented
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45 HPS Not implemented (libxtract code says it doesn't work)
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46 F0 * Fails to find fundamental frequencies in my test file
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47 FLUX Not implemented in libxtract
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48 ATTACK_TIME Not implemented in libxtract
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49 DECAY_TIME Not implemented in libxtract
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50 DELTA_FEATURE Not implemented in libxtract
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51 AUTOCORRELATION Plausible (how should the output be represented?)
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52 AMDF Plausible (how should the output be represented?)
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53 ASDF Plausible (how should the output be represented?)
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54 BARK_COEFFICIENTS Plausible
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55 PEAKS Plausible
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56 MAGNITUDE_SPECTRUM Plausible
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57 AUTOCORRELATION_FFT Plausible (how should the output be represented?)
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58 MFCC * All zeroes
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59 DCT Plausible
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60
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