Once we create our MediaRecorder, we can access its MediaStream with the stream property.
VISUALIZE YOU FOR ANDROID HOW TO
But, before we get to that stage, we need to understand how to take the real-time audio data and make it usable. Even a pulsing red circle would be better than nothing! But, we can do better than that.įor our audio visualization, we are going to use HTML5 Canvas. Also, nothing indicates to the user that the recording is working. Now we have an idea about how to record audio input from our users, we can get onto the fun stuff! Without any visualization, our audio recording UI isn’t very engaging. Note: For a more in-depth look at setting up the MediaRecorder and using it, check out this MDN article: “ Using the MediaStream Recording API”. getDevices: async () => )ĪtAttribute('src', (AUDIO_BLOB)) If we choose to use a different device from the default, this gets stored in the demo state. These are then stored in the demo state and shown as buttons if we choose to change from the default audio input. In the demo, we are filtering and returning the audio inputs returned from enumerateDevices. This gives us access to any connected media devices like webcams and microphones. The main API at play is the MediaRecorder API and using diaDevices. But, we can cherry-pick the important parts you need to know. Now, in the starting point, Kent uses XState to process the different states of the audio recorder. Google Recorder Audio Visualization ( Large preview)īefore we begin to create that visualization, let’s break down that starting point. To be honest, this is actually nicer to work with for reasons we will mention later. He wanted an audio visualization like those on Zencastr or Google Recorder.
In fact, Kent set up a lot of the functionality here for me using XState (XState is another article in itself).īut, the part he wasn’t satisfied with was the visualization. You can pause and stop your recording and re-record. And you’ll see a pretty cool audio wave visualization. You’re able to choose your input device and start recording your audio. You can try it out here in this CodePen example: Where do we start? Well, Kent kindly had a starting point already up and running for me. Note: To see the demos in action, you’ll need to open and test directly them on the CodePen website. We’ll focus on how you capture audio from a user and what you can do with that data. It’s the case that I needed to create this in React as Kent’s site uses Remix. The underlying techniques work with or without React. Although the output demos are in React, we aren’t going to dwell on the React side of things too much. So today, we’re going to look at how you can visualize audio input with JavaScript. One feature of Kent’s site is being able to “ record a call” and then he’d respond via a podcast episode.
Besides adding a little whimsy here and there, there was one part, in particular, Kent wanted a hand with.
The underlying techniques work with or without React.Ī while back I got approached by friend Kent C. Although the output demos are in React, Jhey Tompkins isn’t going to dwell on the React side of things too much. What started as a case study turned into a guide to visualizing audio with JavaScript.
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