What is MIME type "audio/adpcm"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

audio/adpcm is the MIME type for audio files using the Adaptive Differential Pulse-Code Modulation codec.
This codec compresses audio data by encoding only the changes between samples.
It lowers the data rate while keeping resource use low, which is useful where bandwidth or storage is limited.

Used in voice recording and telephony systems.
Common in multimedia applications requiring efficient audio compression.
Favored in environments with limited processing power.

Its main file example is the ADP file.
For more details on ADPCM, check out its overview on Wikipedia.

Associated file extensions

.adp

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: audio/adpcm

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="audio/adpcm">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'audio/adpcm');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.adp

FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.