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"Online base64 encoder audio mp3" | "Base64 encode converter audio mp3" | "Base64 decoding online audio mp3"

Convert "base64 audio mp3" to file

You have binary data encoded in "base64 string" here. First of all you need trim data url meta info. Then you can create binary buffer from "base64 string" and store it to file.

How to create an audio mp3 file from a mp3 base64 string

"Convert a base64" from an "audio mp3" to a file with "Javascript" and Cordova is more easier than you think. However, you can't directly use the cordova-plugin-file to write your string into a file because it is not supported. However, the filewriter accepts binary data, so taking advantage of this principle that's the way in which we are going to save our string as an audio mp3 file on the device. To create a mp3 file from a base64 string, we'll convert it into a Blob using a non-conventional method.

As we are handling files, you need to have the cordova-file-plugin in your project. To install this plugin execute the following command on your command prompt

How to "Base64" and save a "binary audio mp3 file" to

First we need an audio mp3 file

I don't want to point to any specific audio mp3 example since I'd feel bad if some poor soul's hosted mp3 file gets hammered (not likely) because of this example. But you just need a link to a simple, short mp3 (or whatever audio mp3 type you're trying to test). If you look at the sample below replace <> with the link to your test audio mp3 file.

Won't fit in localStorage?

If you're trying to save an audio mp3 file that's too large as a Base64 encoded audio mp3 file will be larger than it's original size and we don't get very much space in localStorage then, ya you're using a file that's too large Get something smaller or don't to this. Just sayin :P

How does it work?

Use fetch api we can easily get at the blob()

Run the Blob through the FileReader

Which also handily turned it into a data url for us

The data url is just a base64 encoded string which is easy to save to localStorage

Read the string back out of localStorage

Set the audio mp3's src attribute to the audio mp3 data url


While I was prototyping this I was borrowing someone else short mp3 file and to work around CORS (cross origin http request) I used the handy<> service. This may be ok to do for a prototype, but you should't typically run your requests through this service. It's insecure and against pretty much all the different web religions.

How to convert mic audio mp3 input to LINEAR16 encoding BASE64 string

The easist solution you may find with the website Convert speech from an audio mp3 file to text using Google Speech API.

The hard way: you must know your input format and than find a converter from it to your LINEAR16 format. Sometimes a conversion in 3 steps for works best like:

Hide Copy Code

Your input format => meta format (like PCM) => LINEAR16

because you may find some converter or code.

Encoding that byte

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