Squadio

Calculate content metadata from audio, e.g. levels and duration.

Installation

Requires FFmpeg to be installed.

npm install --save withyoursquad/squadio

Squadio exports a single function calculateMetadata, which returns metadata about a given audio sample.

The metadata returned contains:

Name	Description
`duration`	Duration of the sample in seconds.
`levels`	Normalized levels (0 is silence and 100 at the peak level of the sample)
`peak`	The peak level of the sample as the reported Root Mean Square of the highest amplitude reported in a frame.
`min`	The minimum level of the sample, in contrast to `peak`.

calculateMetadata accepts a single object as arguments, with the following available options:

Name	Description
`path`	File path to the audio sample being analyzed.
`compressedLength`	(Optional) The number of samples to limit the output `levels` to. If `undefined`, defaults to the maximum value, 1000.

Uses FFmpeg for most of the logic. We're shelling out to the release itself, so we are not required to provide its source or similarly license Squadio under the (L)GPL.
Test fixture sound effects from Pixabay.