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Audio Broadcast and Video Streaming Using Raspberry Pi 3.
The OpenOB project is an audio over IP software package designed for broadcast engineers and system integrators at broadcasters.
The goal of the project is to provide a simple framework for configuring and managing low delay audio links between devices over standard IP networks, with a programmer-friendly API for easy integration into other projects. It can be used on a variety of network connections including over the internet and mobile links such as 3Gwith operating bitrates as low as 16kbps in compressed mode, and support for fully lossless operation in linear PCM mode. If you are using the 2. OpenOB was originally developed by James Harrison at Insanity Radio, a London based community radio station, as a studio-transmitter link.
Over the years many improvements and updates have been made by a wide community of contributors. It is now in regular use in a number of community, non-profit and commercial radio stations in the UK and abroad, and continues to be developed and expanded. OpenOB 3. OpenOB can be used for: Studio to studio contribution links Outside broadcast contribution links Talkback links Studio to transmitter distribution links It can be used on a variety of network connections including over the internet and mobile links such as 3Gwith operating bitrates as low as 16kbps in compressed mode, and support for fully lossless operation in linear PCM mode.
Last updated on Mar 09, Created using Sphinx 1.You can switch between these modes at any time. If your HDMI monitor or TV has built-in speakers, the audio can be played over the HDMI cable, but you can switch it to a set of headphones or other speakers plugged into the headphone jack. If your display claims to have speakers, sound is output via HDMI by default; if not, it is output via the headphone jack.
This may not be the desired output setup, or the auto-detection is inaccurate, in which case you can manually switch the output. Right-clicking the volume icon on the desktop taskbar brings up the audio output selector; this allows you to select between the internal audio outputs. It also allows you to select any external audio devices, such as USB sound cards and Bluetooth audio devices. A green tick is shown against the currently selected audio output device — simply left-click the desired output in the pop-up menu to change this.
The volume control and mute operate on the currently selected device. Here the output is being set to 2which is HDMI. Setting the output to 1 switches to analogue headphone jack.
The default setting is 0 which is automatic. Open up raspi-config by entering the following into the command line:. Select Advanced Options here shown as Option 7, but yours may be different and press Enter. Now select the Option named, Audio here shown as A6, but yours may be different and press Enter :. Now you are presented with the two modes explained above as an alternative to the default Auto option. Select a mode, press Enter and press the right arrow key to exit the options list, then select Finish to exit the configuration tool.
After you have finished modifying your audio settings, you need to restart your Raspberry Pi in order for your changes to take effect. In some rare cases, it is necessary to edit config. Changing the audio output There are three ways of setting the audio output. Desktop volume control Right-clicking the volume icon on the desktop taskbar brings up the audio output selector; this allows you to select between the internal audio outputs. Now select the Option named, Audio here shown as A6, but yours may be different and press Enter : Now you are presented with the two modes explained above as an alternative to the default Auto option.Sending an audio stream across the network to a remote Raspberry Pi with Pulseaudio, the easy way.
You have a nice amplifier in a corner of the living-room, tethered to nice loudspeakers. The average narcissistic audiophile pays more than that for a RCA cable. So, I grabbed a Raspberry Pi model B first generation — get them cheap!
First step is to set it up with an operating system. Since I love DebianI chose Raspbian. Also, the default install at the time of this writing uses Debian Wheezy, which contains a Pulseaudio version too old for our purposes — we need Debian Jessie which offers Pulseaudio 5 instead of Pulseaudio 2.
Pulseaudio is primarily designed to cater to desktop usage by integrating with the interactive session of a logged in user — typically under control of the session manager of whatever graphical desktop environment. Now is a good time to take a moment to consider how much more fastidious the writing of a SysVinit script would have been compared to just dropping this systemd unit in place.
If you stumbled upon this article, you might have read other methods to the same goal, such as this one or this one. So why complicate the system with Avahi? Module-tunnel-sink-new and module-tunnel-source-new are the reason why we require Pulseaudio 5 — they appeared in this version. They are a reimplementation of module-tunnel-sink, using libpulse instead of reinventing the wheel by using their own implementation of the Pulseaudio protocol.
It is possible to authenticate the client more strictly using a cookie file, but for my domestic purposes I decided that identification by IP address is enough — and lets leave some leeway for my daughters to have fun discovering that, spoof it and stream crap to the livingroom.
Also, as some of you may have noticed, this works with IPv6, but it works well with legacy IPv4 too — in which case the address must not be enclosed in brackets. So now, while some of your sound applications such as the sweet Clementine music player pictured here plays, you can switch it to the remote device:.
Sound quality is also a reason why this method is better than a really long stereo line extension cord whose attenuation would degrade sound noticeably. Well, that was verbose and long winded — but I hope to have clearly covered everything… If I there is anything you feel I should explain better, please ask questions in the comments! Name required. Mail will not be published required. Your email address will not be published. Content is available under Attribution-ShareAlike 3.
Send comments, suggestions, criticism, money and death threats to Jean-Marc Liotier. Serendipitous altruism. Jean-Marc Liotier liotier says:. June 1, at GinTechTonic says:.
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Volunteer-led clubs CoderDojo CoderDojos are free, creative coding clubs in community spaces for young people aged 7— Raspberry Jams Meetups for people interested in making things with Raspberry Pi computers. Find a club near me. Find s more books and magazines in the Raspberry Pi Press shop. Make something with code New to Pi? Rock band Make your own musical instruments with code blocks. Happy birthday Make an online birthday card on a webpage.
Our Mission Our mission is to put the power of computing and digital making into the hands of people all over the world.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Radio over IP is probably the best description for this process.
Repeaters or simple transceivers are paired with a Linux computer running this software, which acts both as a repeater controller as well as a VoIP system. Each station or repeater needs to have an audio connection with the computer running QRadioLink. The audio connection is from the input of the radio to the output port of the soundcard, and from the input port of the soundcard to the output port of the radio.
The software is designed so it can be run on low-power micro-computers like the Raspberry Pi or any other board that supports a Linux operating system. They all have the advantage of small dimensions and very low power consumption. Most of them have all the interfacing ports available by default, while others can be installed. In order to function, the system needs electric power, network access and audio connection to the transceivers or repeaters.
QRadioLink is entering the alpha stage. This means we are out of the planning stage and we can provide working alpha builds. Testing them is encouraged, and bug reports are welcome. Please use the mailing list for discussion and bug reports. Unlike Echolink, this software was designed so it can operate without a classic internet connection. If you can interconnect wirelessly two stations, you can also use QRadioLink to stream audio between them.
In other words, there is no requirement for a central authority server to be accessible. This means that remote repeaters can be linked together without having access to the internet. Commands are still sent through the classic DTMF signaling, and any station running QRadioLink can start a call with any other station about which it knows, or it can gather in a conference a theoretically unlimited number of stations.
Although QRadioLink is mostly designed to link amateur radio stations, it can also be used on any radio network to add VoIP capability. As a use case scenario, station A is a repeater which works normally in standalone mode no connection to other stations. A user of the repeater wishes to connect with repeater B and repeater C which are also in standalone mode. The user dials the access codes of stations B and C and a conference is automatically created.
Now the user of repeater A can also be heard through repeaters B and C.Locating of the IP address of your Raspberry Pi is not a difficult thing if you are using a full blown system with display, keyboardmouse and all the other essentials. Knowing some simple tricks can do your job. You can use the second command when you face the error while running the first.
After the successful run of the command, it will reply back with the Raspberry Pi IP address. If you have connected a network cable with your Pi circuit board, then open the Command Prompt and type:. When you run this command, some lines of information will be displayed on the screen. If you get error in running this command, then enter the following:. Check the output and look for the digits showing the IP address. Your Pi is connected over wireless network, and you are facing the trouble in finding its IP address.
Not to worry. To find Raspberry Pi IP address when you are using a headless Pi device for your project is not that difficult too. Check the next method to do it quickly. You may know that almost all of the home networks contain the combination of IP addresses. You should also know that the IP address may get changed occasionally.
So, I advise you to check it from time to time. Your email address will not be published. Last Friday, when I was tinkering with the Pi 3 in my office, I wondered and tried to connect Did you ever think of creating your own FTP server to get an access anytime without worrying about stilling Leave a Reply Cancel reply Your email address will not be published.
Related Posts 10 Oct. Our Best Posts. All Rights Reserved.A simplex repeater is also known as a store-and-forward voice repeater.
Unlike a traditional duplex repeater that receives and transmits at the same time on two different frequencies, a simplex repeater first receives a voice message, stores it, and then retransmits it out. Often this is done on a single frequency, although it can be done using different frequencies for receive and transmit. The advantage of a simplex repeater is that it is very small and compact, since no complex tuned filter cavities are needed. The Raspberry Pi is a single board computer that runs Linux.
A Python script uses PyAudio to read in audio from an attached USB sound card, which is in turn attached to the audio output of the two-way radio. The video below shows the system in action.
To interface the Raspberry Pi with a two-way radio, you need to connect the audio output of the radio to the audio input of the Pi and vice versa.Experimental Audio over IP Intercom Receiver - using a Raspberry PI & the VOIP APP - Seren
Below are example schematics for interfacing the Raspberry Pi with Icom and Kenwood handheld radios. Other radios should be similar to one of these. Future versions of the PeaterPiPyr will also include provisions to use the COR output of a radio to trigger recording, but for now it is audio level triggered VOX operation. To get started using your Raspberry Pi as a simplex repeater, first follow the steps on this page to get your Pi configured and to install the necessary prerequisites.
Once you have all of the prerequisites installed, you can download the source files here. Simply and copy this tarball into a directory on your Pi and uncompress it:.
Audio distribution with Raspberry Pi
Before editing the config. To start it, navigate to your PeaterPiPyr directory and type:. The utility will list all of your input and output sound devices. You want to find the input and output named pulse. Enter in the index corresponding to pulse for the input and output, and the utility will start taking audio samples and printing the audio level to the console window. Make note of what the audio levels are with no audio input present, and also with audio present.
You can adjust the audio of your scanner or radio using this utility as needed. Here are the parameters in the config. See this forum thread for more information. However, this fixed my audio issues and made TwoToneDetect work well. Overview The Raspberry Pi is a single board computer that runs Linux. PeaterPiPyr Getting Started Hardware To interface the Raspberry Pi with a two-way radio, you need to connect the audio output of the radio to the audio input of the Pi and vice versa.
Software To get started using your Raspberry Pi as a simplex repeater, first follow the steps on this page to get your Pi configured and to install the necessary prerequisites. Simply and copy this tarball into a directory on your Pi and uncompress it: tar zxf PeaterPiPyr3. To Do List Add provisions for playing courtesy beep at the end of the repeated transmission Change audio handling to use ALSA instead of pulseaudio to simplify installation and allow the program to run as sudo so that external TX.