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  1. #1
    Registered User
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    Sep 2004
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    AMR codec details

    Hi everybody,
    I need some help, about the codec used by symbian to encode some sound in ".amr".
    I use the Class CRecorderAdapter to encode this sound and the parameters used for the codec are :

    - const TUid KMMFExControllerUID = {0x101F5022};
    - const TUid KMMFExDesFormatUID = {0x101FAF66};
    - const TUint32 KMMFFourCCCodeAMR = {0x524d4120};

    If you know any details or link that could help me please let me know.
    Moreover if you have any code example in C++ to decode the recorded sound, you are welcome.

    tnx in advance guys

  2. #2
    Super Contributor
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    Mar 2004
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    Czech Republic
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    2,037

    Re: AMR codec details

    Hi,

    if you'll search the forum AMR recoding and playback was solved half a year ago. there're many threads discussing it again and again, but it was solved and in my application it works for half a year without any problems. Pls search this forum carefully. I used our solution on 6630 and 6630.

    Bye
    STeN

  3. #3
    Nokia Developer Moderator
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    Mar 2003
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    Lempäälä/Finland
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    Re: AMR codec details

    I have also used STeN's solution with several OS 7.0 phones, so it really works.

    yucca

  4. #4
    Registered User
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    Sep 2004
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    Re: AMR codec details

    I am sorry, I think there is a misunderstanding.

    I am allready able to encode and decode an amr file. My question was, do you know any details about the characteristic of the codec used by the symbian library to encode the amr file such as the byte rate or anything else that can help me to decode this amr file once transmitted to a computer.

    I hope i am clear enough this time.

    Tnx

  5. #5
    Registered User
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    Sep 2004
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    Re: AMR codec details

    More precisely, here there are the different type of amr encription codec coming from the 3gpp internet site.

    MR475 4.75 kbit/s
    MR515 5.15 kbit/s
    MR59 5.90 kbit/s
    MR67 6.70 kbit/s
    MR74 7.40 kbit/s
    MR795 7.95 kbit/s
    MR102 10.20 kbit/s
    MR122 12.20 kbit/s

    does anyone know which one is used by the symbian library to encript its amr sound.

  6. #6
    Super Contributor
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    Mar 2004
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    Re: AMR codec details

    Hi,
    as I remember the MR475 is used as default - I never change it, but if youlooke on the link below you'll find a way how to use also other types (maybe that amount of supported formats depends on the used device type...)

    http://discussion.forum.nokia.com/fo...ighlight=MR475

    Bye
    STeN

  7. #7
    Registered User
    Join Date
    Sep 2004
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    Re: AMR codec details

    txn for all steN

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