Roc for Android!

Android app implementing Roc sender and receiver. Work in progress!

Features:

• receive sound from remote Roc-compatible sender and play to local audio device
• capture sound from apps or microphone and send to remote Roc-compatible receiver

Download

• Download APK from latest release

• Download from F-Droid or IzzyOnDroid:

Screenshot

About Roc

Compatible senders and receivers include:

• command-line tools
• sound server modules (PulseAudio, PipeWire)
• C library
• language bindings (Go, Java)

Key features:

• real-time streaming with guaranteed latency;
• restoring lost packets using Forward Erasure Correction codes;
• converting between the sender and receiver clock domains;
• CD-quality audio;
• multiple profiles for different CPU and latency requirements;
• portability;
• relying on open, standard protocols.

See Roc Toolkit documentation for details.

Building

The app uses Java bindings for Roc Toolkit. You don't need to install them manually; gradle will automatically download AAR from maven central, which contains both libroc and Java bindings built for all Android ABIs.

The easiest way to build the app is using Android Studio.

Alternatively, you can build and deploy APK from command-line.

Build:

./gradlew build

Install to device:

adb install app/build/outputs/apk/debug/roc-droid-*.apk

Development

To check code style use:

./gradlew spotlessCheck

To apply code style use:

./gradlew spotlessApply

To check consistency of version name and code:

./gradlew checkVersion

Signing

Keystore with certificates was generated using this command:

keytool -genkey -v -keystore roc-droid.jks -alias apk -keyalg RSA -keysize 2048 -validity 10000

Then it was encoded to base64:

base64 roc-droid.jks

Then the following secrets were added to the repo:

• SIGNING_STORE_BASE64 - base64-encoded keystore (roc-droid.jks)
• SIGNING_STORE_PASSWORD - keystore password
• SIGNING_KEY_ALIAS - key alias (apk)
• SIGNING_KEY_PASSWORD - key password (same as keystore password)

GitHub actions decode SIGNING_STORE_BASE64 into a temporary .jks file and set SIGNING_* environment variables with the name of the file and credentials.

Then the following command is run:

./gradlew assembleRelease

It reads credentials from the environment variables and signs release APK using them.

Release

To release a new version:

• Create git tag

  ./tag.py --push <remote> <version>
  

  e.g.

  ./tag.py --push origin 1.2.3
  

  Or use tag.py without --push to only create a tag locally, and then push it manually.

• Wait until "Release" CI job completes and creates GitHub release draft.

• Edit GitHub release created by CI and publish it.

Authors

See here.

License

MPL-2.0