[Mp4-tech] Re: Help: How to generate aac content with LATM header from aac content with ADTS header

[Ralph Sperschneider]

? wrote:
> hello all,
> Anybody who knows how to generate aac audio with LATM header from aac 
> data with ADTS header? I can get some information which 
> audioSpecificConfig() included in LATM header needs from ADTS header, 
> such as audioDecoderType, samplingFreqencyIndex, samplingFrequency, 
> channelConfiguration. But how can I fill the 
> GASpecificConfig()/CelpSpecificConfig() included in
> audioSpecificConfig()..., I can't get the corresponding data form ADTS 
> header?
> Thanks in advance,
> Yelite
>  

No CelpSpecificConfig() needs to be written if only AAC content shall be covered 
  by LATM(). The kind of config to be transmitted depends on the AOT.
Note, that a converter tool is provided as part of the MPEG-4 reference software.
Best regards,
Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
Fraunhofer IIS                  | Fax:   +49 9131 776 398
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