Media Broadcaster

Description

a Rasperry Pi-based appliance that broadcasts video or audio via DILC servers.

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Materials

A. Audio Streaming

  * Raspberry Pi (Model B)

  * SD Card with installed Raspbian "Wheezy" OS (Operating System)

         

  * USB Sound Card

  * Audio Computer Microphone

  * USB Micro Cable with Power Brick (5 Volts, 2 Amperes)

  * Ethernet Cable 

B. For Programming

  *PC Monitor 
  *USB Keyboard
  *USB Mouse
  *VGA to HDMI Cable or RCA Cable

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Procedure

A. Installing and Running the Rasbian Wheezy OS (Operating System)

• Use Win32 Disk Imager to write a boot image to your SD Card.

• Download the Wheezy zip file and extract the file.

• Insert the SD Card into your Raspberry Pi and write the disk image file using the installed win32 Disk Imager.

B. Setting Static IP

• Check first the set-up by

cat /etc/network/interfaces

then the line iface eth0 inet dhcp implies that the IP address is via DHCP which is dynamically registered by the router.This is what we want to change.

• Get Information

ifconfig

with these you will get the different information that we will use later such as:

inet address (Pi's Current IP Address)

Bcast (The Broadcast IP Range)

Mask (Subnet Mask Address)

then

netstat -nr or route n

(note that these commands will give you the same information)

Get also the

Gateway Address

Destination Address

• Editing Network Configuration

open the file /etc/network/interfaces by:

sudo nano /etc/network/interfaces

change the line

iface eth0 inet dhcp

to

iface eth0 inet static

then after this line directly type the information that we gathered a while ago then save and exit by Ctrl+o and Ctrl+X

next is to reboot..

sudo reboot

to check..

ifconfig

these will reveal the changes or try to ping it with your IP Address by

ping (your IP Address) -c 5

C.Programming for the Audio Streaming

After installing and running the OS of your Raspberry Pi, you are now ready to program the audio streaming.

Open the LX Terminal,

• Install PulseAudio and these preference GUI with the command

sudo apt-get install pulseaudio

sudo apt-get paprefs

sudo reboot

• After the system being rebooted, next thing to do is to edit and add the following lines in the file /etc/pulse/daemon.conf by these command

sudo nano /etc/pulse/daemon.conf

lines:

resample-method = ffmpeg

default-sample-rate = 44100

alternate-sample-rate = 44100

after these save and exit by Ctrl+o and Ctrl+x

• To make the Raspberry Pi audio server appearing automatically in your "Sound Setting" on every client (PC) and the server (raspberry Pi).

sudo sed -i 's/AVAHI_DAEMON_DETECT_LOCAL=1/AVAHI_DAEMON_DETECT_LOCAL=0/g' /etc/default/avahi-daemon

• Activate the network feature of PulseAudio on both client and server.

paprefs

For the server mark the following boxes

Network Server -Enable network access to local sound devices

Network Server -Allow other machines on the LAN to discover local sound devices

Network Server -Don't require authentication

For the client you want to stream from the server (Raspberry Pi)

Network Access -Make discoverable PulseAudio network sound devices available locally

• Reboot the both server and the client by:

sudo reboot

After the system rebooted the Sound Setting should appear like these:

• To check if the streaming is working plug in the Computer Audio Microphone in the USB Sound card and start to talk. note that there will be a delay of 1000ms-2000ms.

Project Team

• Catherine Bagotsay (developer)
• Dawn Benigno (consultant)
• Dan Villareal (consultant)
• Peter Sy (consultant)

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