Archived:Support for full-duplex audio on Symbian

Comments

I think this page should be updated for the 5th Edition SDK. I discovered the following, which has been tested on a Nokia 5800 XM device:

- the only working API, at least for PCM data, is CMdaAudioInputStream/CMdaAudioOutputStream. MdaAudioSampleEditor has unacceptable latency, CMMFDevSound is not supported, Audio Proxy Server is not supported and VoIP Audio Services doesn't support PCM data;
- you MUST open the output device first (CMdaAudioOutputStream::Open method);
- you MUST play an (arbitrarily short) audio clip using the output device you open (CMdaAudioOutputStream::WriteL method) BEFORE opening the input device;
- MaoscPlayComplete won't get called anyway;
- you MUST NOT use any other audio I/O API in your program otherwise you'll get conflicts (in particular, don't use MdaAudioSampleEditor);
- priority codes described in this article are not needed "standard" values work;
- the solution works from one thread accessing both input and output stream or with multiple threads, provided you respect the above points.

I started a discussion about these topics here:

http://www.developer.nokia.com/Community/Discussion/showthread.php?180410-Full-duplex-audio-5th-edition&p=647915

Rishikulkarni - Full Duplex on Series 40 phones with Nokia VoIP client

Nice article. Could you help clarify the following query? If Full duplex audio is limited to S60 how is Nokia supporting VoIP client on Series 40 phones listed here: http://www.developer.nokia.com/Community/Wiki/VoIP_support_in_Nokia_devices#Support_in_Series_40_devices.

Thank you.

rishikulkarni 17:46, 3 July 2012 (EEST)

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Created: User:Technical writer 1 (21 Aug 2007)

Last edited: hamishwillee (14 Jun 2012)

Support for full-duplex audio in the S60 platform		TSS000260
Overview	Starting from S60 2nd Edition, Feature Pack 2, a number of S60 devices are based on hardware that supports full-duplex audio (simultaneous playback and recording).
Reported against	S60 2nd Edition, Feature Pack 2 and onwards
Date identified	June 23, 2005, updated June 18, 2008
Symptoms	-
Detailed description	Full-duplex audio is enabled by initializing two audio streams (one for playback and one for recording) and using custom audio priority and preference values for each stream. These values are different in S60 2nd and 3rd Edition platforms. Audio APIs that can be used for full-duplex operation: * Two CMMFDevSound instances * CMdaAudioOutputStream + CMdaAudioInputStream * Audio Proxy Server (S60 3rd Ed) * VoIP Audio Services (S60 3rd Ed, FP1 and FP2)
How to reproduce	Trying to create a second audio stream while another client is already using the audio device will result in the KErrInUse error. Or, if the second client has a higher priority, the first one will be stopped with the KErrDied error value.
Solution	Below are the audio priority (TInt) and preference (TMdaPriorityPreference) values needed for enabling full-duplex audio on S60 3rd Edition and S60 2nd Edition, FP2 or FP3 #ifdef __SERIES60_3X__   #define KFullDuplexAudioPrefOutput 0x05220001 #define KFullDuplexAudioPrefInput 0x05210001   #else // S60 2nd Edition FP2 + FP3   #define KFullDuplexAudioPrefOutput 0x01350001 #define KFullDuplexAudioPrefInput 0x01360001   #endif   #define KFullDuplexAudioPriority 99 For more information and example code, see S60 Platform: Full-Duplex Audio Example on Nokia Developer.