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  1. #1
    Registered User
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    Apr 2005
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    2

    Question How to send audio over a SCO link?

    Hello,
    I am trying to do an audio streaming over bluetooth using an SCO channel. I want to connect the phone with a computer. In the computer side I am using a Widcomm driver.
    I am using a CBluetoothSynchronousLink object. When I do a CBluetoothSynchronousLink::SetupConnection() I have a SCO link opened. I know that it is openened because in the callback function MBluetoothSynchronousLinkNotifier::HandleSetupConnectionCompleteL() I have a KErrNone.
    The CBluetoothSynchronousLink has the member function CBluetoothSynchronousLink::Send(). I would want to know how I must send audio data over this link, because I have a CMdaAudioInputStream object and I am trying to send an audio data buffer obtained by CMdaAudioInputStream::ReadL and, in this case, the phone reboots. When I use the CBluetoothSynchronousLink::Send() function to send any other data I obtain a KErrNone in the callback function MBluetoothSynchronousLinkNotifier::HandleSendCompleteL().

    Thanks in advance.
    Regards.
    Lino.

  2. #2
    Registered User
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    Apr 2005
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    5

    Audio Over SCO

    Hi,
    I have writed tha same question in this topic

    http://discussion.forum.nokia.com/fo...o+bluetooth%2A

    but no one answer me. I'm a newbye and I think that you are more expert than me, for this I pray you to aid me...What language are you using and where I can start to do this application.
    Thank you very much in advance

  3. #3
    Nokia Developer Expert
    Join Date
    Mar 2003
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    Tampere, Finland
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    58

    Re: How to send audio over a SCO link?

    audio receiving over SCO is not supported in s60

  4. #4
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    Oct 2005
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    5

    Re: How to send audio over a SCO link?

    Hi!

    I would also like to this, but since it´s impossible I´m thinking of ways to get around the problem. My application would work fine if i could just send an mp3 via bluetooth, and then have the java app to autoplay it.

    Is this possible?

    Thx in advance.

    Niklas

  5. #5
    Registered User
    Join Date
    Nov 2005
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    9

    Re: How to send audio over a SCO link?

    Is there any other layer to use on bluetooth streaming?

    Such as HCI or L2Cap?

    I'm currently on a project to do Bluetooth video streaming... heard that there was a SIG on it... but still couldn'e get them...

    Any advice?... pls?

    Cheers,
    michael

  6. #6
    Registered User
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    Nov 2005
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    5

    Re: How to send audio over a SCO link?

    Quote Originally Posted by gamermic
    Is there any other layer to use on bluetooth streaming?

    Such as HCI or L2Cap?

    I'm currently on a project to do Bluetooth video streaming... heard that there was a SIG on it... but still couldn'e get them...

    Any advice?... pls?

    Cheers,
    michael
    Hi.. anyonde find the solution??

  7. #7
    Regular Contributor
    Join Date
    Nov 2003
    Posts
    92

    Re: How to send audio over a SCO link?

    I don't know which point you've reached, but I've previously worked on a proto soft using L2CAP sockets to stream A/V feeds between two symbian devices. L2CAP broadly being TCP-like, we had encouraging results (in close vicinity that is, don't let a concrete wall slip between the two handsets...).

    Olivier

  8. #8
    Registered User
    Join Date
    Nov 2005
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    9

    Re: How to send audio over a SCO link?

    How is it like? How are the resolutions, fps, lags?
    What are the difficulties you encountered along the way?

    Cheers,
    michael

  9. #9
    Regular Contributor
    Join Date
    Nov 2003
    Posts
    92

    Re: How to send audio over a SCO link?

    Hello,


    It's been two years now so I don't have all the details, here is what I remember:

    It was a "quick" prototype, so we dealt only with SQCIF & QQVGA frames, from the on-board camera. We tried to stream only 3GPP-like content so, that would be 12.2 kbps AMR for audio & MPEG4 SP (64 kbps) for video. Observed frame rates ranged from 9 to 12 fps when the handsets were not far from each other 3 m) and would then quickly drop with increasing distance.

    Lag, I don't remember exact values. Sure thing is that it quickly increased with the distance. But initially we'd experience something like 3 second-delay between recording & playback.

    Olivier

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