AAC failure using CMMFDevSound on E71 device

[bfriedk1]

Hello,

My application uses the CMMFDevSound class to play back AAC audio. The code works well on the N95 device, but fails the InitializeL call on the E71 with a KErrNotFound (-1) error:

TRAPD(err, iDevSound->InitializeL(*this, KMMFFourCCCodeAAC, EMMFStatePlaying));

The InitializeComplete callback in the MDevSoundObserver instance is not called either.

The failure is a little odd, because the GetSupportedInputDataTypesL and "Find" call succeeds on the E71:

priority.iPriority = 100;
priority.iPref = EMdaPriorityPreferenceTimeAndQuality;
priority.iState = EMMFStatePlaying;
TRAPD(err, iDevSound->GetSupportedInputDataTypesL(types, priority));
TRAPD(err2, types.Find(KMMFFourCCCodeAAC));

I know the E71 has an on-board AAC decoder. Is there a different initialization sequence required for this device?

Thanks,
Brian

[qxiaoyuan]

it seems that you need use CMMFCodec decode aac audio.
search wiki or dibo find more.

[bfriedk1]

qxiaoyuan -

Thank you for your reply.

I have looked through the CMMFCodec interface and understand how it works. But I wanted to double check that there really isn't a way to support AAC audio playback on the E71 using the CMMFDevSound approach. Using CMMFDevSound works great for MP3 on both the N95 and E71, so it seems a little odd that AAC doesn't work on the E71 but works fine on the N95...

- Brian

[wizard_hu_]

See http://discussion.forum.nokia.com/fo...d.php?t=165710