icecast-parser

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Node.js module for getting and parsing metadata from SHOUTcast/Icecast radio streams.

NOTE: the server that serves radio station stream must support Icy-Metadata header. If that is not the case, this parser cannot parse the metadata from there.

Features

- Opens async connection to URL and gets response with radio stream and metadata. Then pipes the response to Transform stream for processing;
- Getting metadata from stream is implemented as Transform stream, so you can pipe it to another Writable\Duplex\Transform;
- Once it receives metadata, metadata event triggers with metadata object;
- After metadata is received, connection to radio station closes automatically, so you will not spend a lot of traffic;
- But you can set keepListen flag in configuration object and continue listening radio station;
- Auto updating metadata from radio station by interval in economical way (connection is opens when time has come);
- Metadata parsed as a Map with key-value;
- When you create a new instance, you get EventEmitter. So you can subscribe to other events;
- Easy to configure and use;

Getting Started

You can install icecast-parser from npm.

``shell
npm install icecast-parser
`

Get your first metadata from radio station.

`typescript
import { Parser } from 'icecast-parser';

const radioStation = new Parser({ url: 'https://live.hunter.fm/80s_high' });
radioStation.on('metadata', (metadata) => process.stdout.write(${metadata.get('StreamTitle') ?? 'unknown'}\n));
`

Configuration

You can provide additional parameters to constructor:

- url - by default empty and REQUIRED. Otherwise, you will get an error.
- userAgent - by default icecast-parser.
- keepListen - by default false. If you set to true, then response from radio station will not be destroyed and you can pipe it to another streams. E.g. piping it to the speaker module.
- autoUpdate - by default true. If you set to false, then parser will not be listening for recent updates and immediately close the stream. So that, you will get a metadata only once.
- notifyOnChangeOnly - by default false. If you set both autoUpdate and notifyOnChangeOnly to true, it will keep listening the stream and notifying you about metadata, but it will not notify if metadata did not change from the previous time.
- errorInterval - by default 10 minutes. If an error occurred when requesting, the next try will be executed after this interval. Works only if autoUpdate is enabled.
- emptyInterval - by default 5 minutes. If the request was fullfiled but the metadata field was empty, the next try will be executed after this interval. Works only if autoUpdate is enabled.
- metadataInterval - by default 5 seconds. If the request was fullfiled and the metadata was present, the next update will be scheduled after this interval. Works only if autoUpdate is enabled.

`typescript
import { Parser } from 'icecast-parser';

const radioStation = new Parser({
autoUpdate: true,
emptyInterval: 5 * 60,
errorInterval: 10 * 60,
keepListen: false,
metadataInterval: 5,
notifyOnChangeOnly: false,
url: 'https://live.hunter.fm/80s_high',
userAgent: 'Custom User Agent',
});

radioStation.on('metadata', (metadata) => process.stdout.write(${metadata.get('StreamTitle') ?? 'unknown'}\n));
`

Events

You can subscribe to following events: end, error, empty, metadata, stream.

- end event triggers when connection to radio station was ended;
- error event triggers when connection to radio station was refused, rejected or timed out;
- empty event triggers when connection was established successfully, but the radio station doesn't have metadata in there;
- metadata event triggers when connection was established successfully and metadata is parsed;
- stream event triggers when response from radio station returned and successfully piped to Transform` stream.

License

MIT