generateSpectraImage

Generate Spectra Images and Audio File Segments from a MediaFile.

Note

If the queried endTime is greater than the length of the file, the endTime will be updated to the length of the file and returned in the parameters.

generateSpectraImage/{mediaFileId}/

POST

• Parameters

  • startTime

    in seconds, relative to the beginning of the file.

  • endTime

    in seconds, relative to the beginning of the file. If this is greater than the length of the file, then data will be returned up until the end of the file.

  • numTimeFramesPerSecond

  • numFrequencyBands

  • dampingFactor

  • minFrequency

    (in Hz)

  • maxFrequency

    (in Hz)

  • gain

    (optional, default 1.0)

• Response

  • A JSON dictionary of
    • imageUrl
    • audioSegmentUrl
    • params
    • imageHeight
    • imageWidth

Example

Example Parameters

{
    "startTime": 0.0,
    "endTime": 5.0,
    "minFrequency": 20.0,
    "maxFrequency": 20000.0,
    "numFrequencyBands": 32,
    "numTimeFramesPerSecond": 20,
    "dampingFactor": 0.02,
    "gain": 1
}

Example Response

POST /api/v0/generateSpectraImage/179070/

HTTP 200 OK
Content-Type: application/json
Vary: Accept
Allow: POST, OPTIONS

{
    "imageUrl": "https://media.amanda.arloproject.com/files/<!-- SNIP -->.jpg",
    "audioSegmentUrl": "https://media.amanda.arloproject.com/files/<!-- SNIP -->.segment.wav",
    "params": {
        "minFrequency": 20.0,
        "numTimeFramesPerSecond": 20,
        "dampingFactor": 0.02,
        "numFrequencyBands": 32,
        "showFrequencyScale": true,
        "showTimeScale": true,
        "maxFrequency": 20000.0,
        "catalogSpectraNumFrequencyBands": null,
        "mediaFile": 179070,
        "topBorderHeight": 30,
        "simpleNormalization": true,
        "gain": 1.0,
        "startTime": 0.0,
        "timeScaleHeight": 22,
        "endTime": 5.0,
        "borderWidth": 50
    },
    "imageHeight": 84,
    "imageWidth": 200.0
}