Symbian
Symbian OS Library

FAQ-1199 Does Symbian OS support full duplex [bi-directional] audio?

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Classification: C++ Category: Multimedia
Created: 12/23/2004 Modified: 01/05/2005
Number: FAQ-1199
Platform: Not Applicable

Question:
I have been trying to play and record audio at the same time and have found no device that supports this. Is this supported on Symbian OS in any version or device ?

Answer:
The Symbian OS reference design does not support full duplex audio because the audio policy has been designed to be simple 'one-shot' audio playback / recording i.e. only one application will have any audio at any time. This policy is in the non-standardised part of the audio subsystem DevSound and so phone manufacturers are able to include full duplex audio in their own designs if they wish.

    At present only the 6630 (based on Symbian OS 8.0a) has included a full duplex audio policy. This is, however, restricted and has to be initialised into full duplex 'mode' via a proprietary request. In order to obtain the information on how to do this, 3rd parties are advised to speak directly to Nokia who may be able to release this information.