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VoIP on Android



Wednesday 7 April 2010
Johan Cloetens
                                  @belgianwaves
                    • background interest since start
                    • huge android fan since oct. 2008
                    • free applications on Android Market:
                         SipAgent, ShootMe/PicMe, OnAir, ...
                    • professional android consultant since feb.
                         2009
                    • Escaux, Philips, Cherry, ...
Wednesday 7 April 2010
VoIP
                                why should i care?

                    • isn’t this boring?
                    • break free / save costs
                    • market trends
                    • bringing voice in the network allows
                         enriched experiences
                    • Android is the ideal platform
Wednesday 7 April 2010
Android (overview)




Wednesday 7 April 2010
Android (ipc)

              • Intents               • Services
               • loose coupling        • tight coupling
               • asynchronous          • synchronous
               • hash-like messages    • aidl / corba-like

Wednesday 7 April 2010
Android (audio)

                                     AudioTrack
                         App
                                     AudioRecord
                                                   MediaServer




Wednesday 7 April 2010
Android (audio)
                         APPLICATIONS               Audio Apps



                         APP FRAMEWORK AudioTrack /           MediaPlayer /
                                          AudioRecord         Recorder Class

                         RUNTIME -> NATIVE              JNI

                         NATIVE LIBRARIES
                                                        Media
                                                        Library
                                                    IPC binding
                                 MediaPlayer                        Audio Flinger
                                 Service (Native)                   (Native)



                             PV OpenCore Player/
                             Author Engine                 IPC binding


                                                                         HAL of Audio
                          PV Audio Enc/     PV Media
                          Dec Node          In/Out Node

                                               PV MIO
                                               I/F
                                                                         Alsa user Lib
                                                    Android Audio
                                                    I/O Wrapper



                         LINUX KERNEL
                                                                    Alsa Driver




Wednesday 7 April 2010
AudioTrack

                         AudioTrack t = new AudioTrack(AudioManager.STREAM_VOICE_CALL,
                             	   	   	   	   	   	     8000,
                             	   	   	   	   	   	     AudioFormat.CHANNEL_CONFIGURATION_MONO,
                         	   	   	   	   	   	   	     AudioFormat.ENCODING_PCM_16BIT,
                         	   	   	   	   	   	   	     bufferSizeOut(),
                         	   	   	   	   	   	   	     AudioTrack.MODE_STREAM);
                         	   	   t.play();
                         	   	   	   byte buffer[] = new byte[BUFFER_SIZE];
                         	   	   	   while (!stopped()) {
                         	   	   	   	   int read = fetchIn(buffer);
                         	   	   	   	   if (read > 0) {
                         	   	   	   	   	   t.write(buffer, 0, read);
                         	   	   	   	   }
                         	   	   	   }
                         	   	   t.stop();




Wednesday 7 April 2010
AudioRecord

                     AudioRecord r = new AudioRecord(MediaRecorder.AudioSource.MIC,
                     	   	  	   	   	   	   	  	     8000,
                     	   	  	   	   	   	   	  	     AudioFormat.CHANNEL_CONFIGURATION_MONO,
                     	   	  	   	   	   	   	  	     AudioFormat.ENCODING_PCM_16BIT,
                     	   	  	   	   	   	   	  	     bufferSizeIn());
                     	   	  r.startRecording();
                     	   	  	   byte buffer[] = new byte[BUFFER_SIZE];
                     	   	  	   while(!stopped()) {
                     	   	  	   	   int read = r.read(buffer, 0, BUFFER_SIZE);
                     	   	  	   	   if (read > 0) {
                     	   	  	   	   	   pushOut(buffer, read);
                     	   	  	   	   }
                     	   	  	   }
                     	   	  r.stop();




Wednesday 7 April 2010
It’s easy ;-)
                                  choices left

                    • compliancy to protocols (sip & iax)
                    • codecs (ulaw, alaw, gsm, g729, ...)
                    • java versus native
                    • to silo or not to silo...
                    • gotcha’s

Wednesday 7 April 2010
Gotchas

                    • fragmentation
                    • room for interpretation api’s
                    • hardware dependency / buffer hints
                    • latency
                    • bugs
                    • floating point support
Wednesday 7 April 2010
Demos




Wednesday 7 April 2010
To silo or not to silo
                            that is the question...


                    • basic functionality easier to integrate
                    • enriched experience asks for silo
                    • how to blend experience / look & feel?
                    • ( what has Google in the pipe? )

Wednesday 7 April 2010
Conclusion
                    • VoIP on Android is a reality
                    • could be easier
                    • will improve
                    • enriched communication experience only
                         limited by your imagination
                    • Android is platform of choice, plenty of
                         options


Wednesday 7 April 2010
Feedback
                         belgianwaves@gmail.com




Wednesday 7 April 2010

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droidcon_voip_android

  • 2. Johan Cloetens @belgianwaves • background interest since start • huge android fan since oct. 2008 • free applications on Android Market: SipAgent, ShootMe/PicMe, OnAir, ... • professional android consultant since feb. 2009 • Escaux, Philips, Cherry, ... Wednesday 7 April 2010
  • 3. VoIP why should i care? • isn’t this boring? • break free / save costs • market trends • bringing voice in the network allows enriched experiences • Android is the ideal platform Wednesday 7 April 2010
  • 5. Android (ipc) • Intents • Services • loose coupling • tight coupling • asynchronous • synchronous • hash-like messages • aidl / corba-like Wednesday 7 April 2010
  • 6. Android (audio) AudioTrack App AudioRecord MediaServer Wednesday 7 April 2010
  • 7. Android (audio) APPLICATIONS Audio Apps APP FRAMEWORK AudioTrack / MediaPlayer / AudioRecord Recorder Class RUNTIME -> NATIVE JNI NATIVE LIBRARIES Media Library IPC binding MediaPlayer Audio Flinger Service (Native) (Native) PV OpenCore Player/ Author Engine IPC binding HAL of Audio PV Audio Enc/ PV Media Dec Node In/Out Node PV MIO I/F Alsa user Lib Android Audio I/O Wrapper LINUX KERNEL Alsa Driver Wednesday 7 April 2010
  • 8. AudioTrack AudioTrack t = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeOut(), AudioTrack.MODE_STREAM); t.play(); byte buffer[] = new byte[BUFFER_SIZE]; while (!stopped()) { int read = fetchIn(buffer); if (read > 0) { t.write(buffer, 0, read); } } t.stop(); Wednesday 7 April 2010
  • 9. AudioRecord AudioRecord r = new AudioRecord(MediaRecorder.AudioSource.MIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeIn()); r.startRecording(); byte buffer[] = new byte[BUFFER_SIZE]; while(!stopped()) { int read = r.read(buffer, 0, BUFFER_SIZE); if (read > 0) { pushOut(buffer, read); } } r.stop(); Wednesday 7 April 2010
  • 10. It’s easy ;-) choices left • compliancy to protocols (sip & iax) • codecs (ulaw, alaw, gsm, g729, ...) • java versus native • to silo or not to silo... • gotcha’s Wednesday 7 April 2010
  • 11. Gotchas • fragmentation • room for interpretation api’s • hardware dependency / buffer hints • latency • bugs • floating point support Wednesday 7 April 2010
  • 13. To silo or not to silo that is the question... • basic functionality easier to integrate • enriched experience asks for silo • how to blend experience / look & feel? • ( what has Google in the pipe? ) Wednesday 7 April 2010
  • 14. Conclusion • VoIP on Android is a reality • could be easier • will improve • enriched communication experience only limited by your imagination • Android is platform of choice, plenty of options Wednesday 7 April 2010
  • 15. Feedback belgianwaves@gmail.com Wednesday 7 April 2010