librespot/README.md

# librespot
*librespot* is an open source client library for Spotify. It enables
applications to use Spotify's service, without using the official but
closed-source libspotify. Additionally, it will provide extra features
which are not available in the official library.

## Building
Rust 1.15.0 or later is required to build librespot.

It also requires a C, with portaudio.

On debian / ubuntu, the following command will install these dependencies :
```shell
sudo apt-get install build-essential portaudio19-dev
```

On Fedora systems, the following command will install these dependencies :
```shell
sudo dnf install portaudio-devel make gcc
```

On OS X, using homebrew :
```shell
brew install portaudio
```

Once you've cloned this repository you can build *librespot* using `cargo`.
```shell
cargo build --release
```

## Usage
A sample program implementing a headless Spotify Connect receiver is provided.
Once you've built *librespot*, run it using :
```shell
target/release/librespot --username USERNAME --cache CACHEDIR --name DEVICENAME
```

## Discovery mode
*librespot* can be run in discovery mode, in which case no password is required at startup.
For that, simply omit the `--username` argument.

## Audio Backends
*librespot* supports various audio backends. Multiple backends can be enabled at compile time by enabling the
corresponding cargo feature. By default, only PortAudio is enabled.

A specific backend can selected at runtime using the `--backend` switch.

```shell
cargo build --features portaudio-backend
target/release/librespot [...] --backend portaudio
```

The following backends are currently available :
- ALSA
- PortAudio 
- PulseAudio

## Cross-compiling
A cross compilation environment is provided as a docker image.
Build the image from the root of the project with the following command :

```
$ docker build -t librespot-cross -f contrib/Dockerfile .
```

The resulting image can be used to build librespot for linux x86_64, armhf and armel.
The compiled binaries will be located in /tmp/librespot-build

```
docker run -v /tmp/librespot-build:/build librespot-cross
```

If only one architecture is desired, cargo can be invoked directly with the appropriate options :
```shell
docker run -v /tmp/librespot-build:/build librespot-cross cargo build --release --no-default-features --features alsa-backend
docker run -v /tmp/librespot-build:/build librespot-cross cargo build --release --target arm-unknown-linux-gnueabihf --no-default-features --features alsa-backend
docker run -v /tmp/librespot-build:/build librespot-cross cargo build --release --target arm-unknown-linux-gnueabi --no-default-features --features alsa-backend
```

Don't forget to set the `with-tremor` feature flag if your target device does not have floating-point capabilities.

## Development
When developing *librespot*, it is preferable to use Rust nightly, and build it using the following :
```shell
cargo build --no-default-features --features "nightly portaudio-backend"
```

This produces better compilation error messages than with the default configuration.

## Disclaimer
Using this code to connect to Spotify's API is probably forbidden by them.
Use at your own risk.

## Contact
Come and hang out on gitter if you need help or want to offer some.
https://gitter.im/sashahilton00/spotify-connect-resources

## License
Everything in this repository is licensed under the MIT license.