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MP3 to Waveform

Introduction

This codebase is for a talk at Prairie Dev Con in June 2019. Slides can be found here. The demo will take an MP3 file and generate a waveform png via ffmpeg up on Google Cloud Platform.

prdc-generateUploadLink - Generates a "signed URL" that a user will be able to POST an MP3 to. The MP3 is placed in a bucket called prdc19-audio-upload.

prdc-generateWaveform - Is triggered from MP3s being placed in the prdc19-audio-upload bucket and will generate a waveform png into the prdc19-waveform bucuket and will pass back a link to it.

Running the demo

Prerequisites

  1. Install gcloud SDK for your chosen platform
  2. Google Cloud Platform Service account
    1. The service account must have the following IAM role:
      • Service Account Token Creator
  3. Google Cloud Function & Google Cloud Storage must be enabled
  4. Create two GCS buckets: prdc19-audio-upload & prdc19-waveform
    • The prdc-waveform bucket should have allUsers read-access such that the pngs being generated are accessible publically

Clone this repository

git clone git@github.com:ctataryn/prdc19-gcf-waveform.git

Deploy

gcloud functions deploy prdc-generateUploadLink --entry-point generateUploadLink --memory 128MB --runtime nodejs8 --timeout 10s --trigger-http

gcloud functions deploy prdc-generateWaveform --entry-point generateWaveform --memory 1024MB --runtime nodejs8 --timeout 540s --trigger-bucket prdc19-audio-upload

Invoking

To generate an upload link for an MP3: https://us-central1-crowdscriber.cloudfunctions.net/prdc-generateUploadLink?id=this-is-a-test-id

To upload the MP3 and generate a waveform png: curl -X put -H 'Content-Type: audio/mpeg' --upload-file ./mp3s/test000.mp3 <upload link>

This will upload an MP3 to the prdc19-audio-upload bucket. The prdc19-generateWaveform function will then be triggered, create the waveform png and then send a POST request to the url specified in the lib/util.js If you don't have the ability to receive the notification, then just refresh the bucket in the Google Cloud Platform Web Console until the png appears.

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