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Local Audio Broadcast

This simple application captures the local audio playback in Windows and sends it over the local network to a UPnP renderer. I originally wrote it to stream Spotify music playback from my computer over the home network to my HTPC running XBMC/Kodi (since I wasn't satisfied with the available Spotify plugins), it can be used for any audio though.

Screenshot of the GUI

The app has a simple GUI that offers the possibility to select a target UPnP renderer and send the audio captured from the default playback interface to it. It also acts as a UPnP server that can be browsed from a UPnP controller, where audio streams of all active playback devices (not just the default device) are served.

Download a binary release here.

Features

  • Captures local audio playback from any playback device
  • Supports multiple simultaneous streams to multiple renderers
  • UPnP control point (to push the default playback stream to a UPnP renderer)
  • UPnP server (to request a playback stream from a UPnP controller)
  • Metadata embedding if requested by the renderer (supported e.g. by XBMC/Kodi and foobar2000)
    • Embeds the Spotify track name into the stream if a running instance is detected
    • Can be extended for other music players through a simple interface

Requirements

  • Windows 7+
  • tested with XBMC 12, XBMC 13, Kodi 14 and foobar2000 1.3, Windows Media Player (WMP cannot browse server directory and only renders WAV)

Issues

  • Depending on the buffering in the renderer, there can be a noticeable lag.
  • The consumption of RAM grows slowly but constantly over hours of use until at some point it also starts hogging one CPU core and slowing down the system. This seems to be a bug in the UPnP library and also happens with other tools using the library.

License

Copyright 2014 Mario Guggenberger [email protected]

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.