Add an option for MusicExtractor or FreesoundExtractor to work on raw audio input

[009deep]

MusicExtractor and FreesoundExtractor both accepts only filename as input. If I pass signal value as raw data it errors out as
Couldn't find 'signal' in FreesoundExtractor::inputs.

There should be a way to pass buffer as input to these extractors.

[dbogdanov]

Agreed, MusicExtractor and FreesoundExtractor also extract some metadata from files, therefore, they should be probably split into a few auxiliary algorithms, one of which would accept raw audio input.

[009deep]

@dbogdanov In absence of signal option for above extractors, I am using LowLevelSpectralExtractor for deriving mfcc and few other features.

It'll be really helpful if you can add couple of sample codes:

1. An example showing how to give PCM data as signal input to any algorithm
2. An example showing how to give a .wav file's content as signal.

I am struggling with both above issues. Any immediate help will be highly appreciated.

[009deep]

Ignore above comment, I just figured that out.

[ZhiyuLiu1993]

@009deep hi，could you tell me how to use PCM raw data buffer as input for any algorithm? Thank you!

[009deep]

@ZhiyuLiu1993 hey sorry for late reply. For PCM data multiply your data with (1/(2^(n-1) -1)) before feeding it to essentia algorithms. Where n is number of bits to represent PCM data so e.g. if you use S16LE format for PCM data.

[stonelazy]

For PCM data multiply your data with (1/(2^(n-1) -1)) before feeding it to essentia algorithms

@009deep Am sorry for bringing up an ancient thread. I hope you are suggesting to just normalize the input before feeding to Essentia algorithms ? If not, would it be possible to share a snippet or detail more on how to input a wav file to essentia without using MonoLoader or their AudioLoader.