Raspberry Pi: Webcam Microphone Streaming Test

1. Install ALSA

   sudo apt-get install gstreamer0.10-alsa

2. Audio sound test using alsasrc

   gst-launch -v alsasrc device=hw:1 ! audioconvert ! volume volume=10 ! alsasink

3. Microphone streaming over TCP
   TX (RPi)

   gst-launch alsasrc device=hw:1 ! queue ! audioconvert ! speexenc ! queue ! tcpserversink host=x.x.x.x port=5001

   RX (Ubuntu on Pandaboard ES)

   gst-launch tcpclientsrc host=x.x.x.x port=5001 ! sppxdec ! volume volume=10 ! autoaudiosink

   The latency was not good enough, around 1 sec.
   (Note: TX host IP should be receiver/Pandaboard IP address, and RX host IP address should be transmitter/Rpi IP address.)

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4. Microphone streaming over UDP
   TX (RPi)

   gst-launch -v alsasrc device=hw:1 ! audioconvert ! audioresample ! 'audio/x-raw-int,rate=8000,width=16,channels=1' ! speexenc ! rtpspeexpay ! udpsink host=x.x.x.x port=5001

   RX (Ubuntu on Pandaboard ES)

   gst-launch udpsrc port=6666 caps="application/x-rtp, media=(string)audio, clock-rate=(int)16000, encoding-name=(string)SPEEX, encoding-params=(string)1, payload=(int)110" ! gstrtpjitterbuffer ! rtpspeexdepay ! speexdec ! audioconvert ! audioresample ! volume volume=10 ! autoaudiosink

   Still around 1 sec latency...(Note: host IP should be receiver/Pandaboard IP address)

Also read:

[Raspberry Pi] Using Bluetooth Audio Headphone

Hardware:
    Raspberry Pi
    PS3 Eye
    EW-7781Uh WiFi dongle
    Ubuntu machine (Pandaboard ES)

Summary:
    PS3 eye was used for microphone streaming over TCP/UDP.
    The latency was not so great (around 1 sec), and it needs to be investigated, especially using different encoder.  
     RPi CPU usage was about 51%  for TCP(top command)
     RPi CPU usage was about 29%  for UDP(top command)

Reference: