[Mp4-tech] LOAS/LATM without a container

[Danijel Domazet]

Thank you Ralph.
Another question: is it possible to play LOAS/LATM streams (a set of LOAS 
frames, each starting with LOAS syncword 2B7) if they are not inside some 
other container (like MPEG2)?
Thanks,
Danijel Domazet
----- Original Message ----- 
From: "Ralph Sperschneider" <ralph.sperschneider iis.fraunhofer.de>
To: "Danijel Domazet" <Danijel.Domazet zg.t-com.hr>
Cc: "Andreas Schneider" <Andreas.Schneider codingtechnologies.com>; 
<mp4-tech lists.mpegif.org>
Sent: Thursday, July 05, 2023 5:26 PM
Subject: [Mp4-tech] Re: LATM LOAS fill bits
> Danijel Domazet wrote:
>>  Hi MP4Tech,
>>  Here is a syntax snippet from LATM/LOAS AAC audio as defined in ISO/IEC 
>> 14496-3:2001 Technical Corrigendum 2, 15.6.2004. (page 8.):
>>  if(!useSameConfig)
>> {
>>  if(audioMuxVersion==1)
>>  {
>>     ascLen = LatmGetValue();
>>  }
>>   ascLen -=AudioSpecificConfig();
>>   *fillBits*; (ascLen is the nubmer of fill bits to be writen)
>> }
>>  It is obvious that in case of audioMuxVersion == 0, ascLen gets used 
>> without having been initialized. The question is: how many fillBits 
>> should be written to bitstream in this case? Please, help.  Regards,
>> Danijel Domazet
>>
>
> The syntax was fixed meanwhile and reads now as follows:
>
> if (! useSameConfig) {
>   if ( audioMuxVersion == 0 ) {
>      AudioSpecificConfig();
>   }
>   else {
>     ascLen = LatmGetValue();
>     ascLen -= AudioSpecificConfig();
>     fillBits;
>   }
> }
>
> Ralph
> -- 
> Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
> Fraunhofer IIS                  | Fax:   +49 9131 776 398
> Am Wolfsmantel 33               | 
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