# youtube-audio-stream

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This module streams youtube using [ytdl](https://github.com/fent/node-ytdl) to get the youtube download stream.

To convert to audio the module [fluent-ffmpeg](https://github.com/schaermu/node-fluent-ffmpeg) is used.

You will need to have [ffmpeg](http://www.ffmpeg.org/) and the necessary encoding libraries installed, as well as in your PATH.

If you're on OSX, this can be handled easily using [Homebrew](http://brew.sh/) with `brew install ffmpeg`.

## Getting Started

1. With [npm](http://npmjs.org), run `npm install youtube-audio-stream`
2. `const stream = require('youtube-audio-stream')`

## Usage

Here is an example that:

1. queries for a video by video ID
2. Retrieves the audio via this package
3. write it to `res`

```js
const stream = require('youtube-audio-stream')
async function handleView (req, res) {
  try {
    for await (const chunk of stream(`http://youtube.com/watch?v=${req.params.videoId}`)) {
      res.write(chunk)
    }
    res.end()
  } catch (err) {
    console.error(err)
    if (!res.headersSent) {
      res.writeHead(500)
      res.end('internal system error')
    }
  }
}
```

## Node example playing directly to speaker
```js
const stream = require('youtube-audio-stream')
const url = 'http://youtube.com/watch?v=34aQNMvGEZQ'
const decoder = require('lame').Decoder
const speaker = require('speaker')

stream(url)
.pipe(decoder())
.pipe(speaker())
```

## Testing

This package comes with a simple example for testing. This can be run with the command `npm test`, which will then serve the example at `localhost:3000`. The example consists of an `<audio>` component whose source is retrieved via this package.

### Testing inside a docker container

You can test this module without the need o have [ffmeg](http://www.ffmpeg.org/) locally installed
doing it inside a container.

To build the Docker image:
```
docker build . -t youtube-audio-stream-test
```

To run the test:
```
docker run --rm -it -p 3000:3000 youtube-audio-stream-test
```