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Owain Phillips_2
Owain Phillips_2
Associate II
July 5, 2018
Question

AAC codec

  • July 5, 2018
  • 1 reply
  • 2162 views
Posted on July 05, 2018 at 10:40

Hi,

I am searching for AAC Codec for STM32F4 but struggling to find anything on st.com.

Can anyone point me to a supplier preferably ST. I find stuff at STM for MP3 and WMA but cannot find AAC.

I have seen press announcements saying ST has codec's; but maybe this was an over zelous marketing man...

http://mil-embedded.com/news-id/?41670=

“Further Details on Development Support:

The extensive development ecosystem now in place includes ST’s STM32F429I-DISCO Discovery kit for STM32F429/STM32F439 and STM32F401C-DISCO for STM32F401.

In addition, developers using the STM32F429/39 can already use the STM32429I-EVAL full-featured evaluation board for the STM32F429, which features a 4.3-inch display, or the STM32439I-EVAL for STM32F439, which has a 5.7-inch display.

A complete audio IP package is available on request from ST, containing functions ranging from codecs optimized for STM32F4, such as MP3, WMA, AAC and voice codecs to sound-processing algorithms leveraging the high performance of the STM32F429/F439. These include smart volume control, filters for loudness, bass mix and other controls, and stereo widening and synchronization utilities such as sample-rate converters and clock-drift compensation.�

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    1 reply

    AvaTar
    AvaTar
    Senior III
    July 5, 2018
    Posted on July 05, 2018 at 11:25

    A complete audio IP package is available

    on request

    from ST,

    ...

    I assume this means directly to ST, and not on public download or a public forum.

    And it might not be for free (as in free beer).

    Owain Phillips_2
    Owain Phillips_2Author
    Associate II
    July 5, 2018
    Posted on July 05, 2018 at 12:05

    You may be right. I think AAC is poprietry and not free?

    How to ask STM for that?

    We currently use an AAC codec that we bought in; but its using a lot of CPU and its a binary library. So not visible what processor features been used. I suppose I could disassemble it.
    AvaTar
    AvaTar
    Senior III
    July 5, 2018
    Posted on July 05, 2018 at 12:18

    I think AAC is poprietry and not free?

    Supposedly yes. Wikipedia says :

    ... However, a patent license is required for all manufacturers or developers of AAC codecs. ...

    How to ask STM for that?

    A sales representative or FAE ?

    I suppose I could disassemble it.

    Tools like

    objdump

    can do this, but I'm not sure it it's worth it.

    You would probably like to re-compile the C sources with different settings. Disassembled code would hardly do that.

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