[Mp4-tech] Re: [audio] Regarding conformance testing of HE-AAC

[sakthi.narayanan soc-soft.com]

Hi Ralph,
   Thanks for your immediate reply. I want to do MPEG4 AAC Decoder Error
Conformance test.Rightnow,I don't have any standard erroneous bit stream
With me. I generated the erroneous bit stream by corrupting the standard
bit stream. By that I cant generate erroneous bit stream for
UNIMPLEMENTED_CCE error.So,I just want to know how to generate erroneous
bit stream for the MPEG4 AAC Decoder.
With Regards,
Sakthi Narayanan.D
-----Original Message-----
From: Ralph Sperschneider [mailto:ralph.sperschneider iis.fraunhofer.de]
Sent: Saturday, December 17, 2023 4:47 AM
To: sakthi narayanan
Cc: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Re: [audio] Regarding conformance testing of HE-AAC
sakthi narayanan wrote:
> Hi,
>
>   Presently,Iam working in MPEG4 AAC-LC Decoder.I had the standard 
> bitstreams.Iam having small doubt in the profile.
>
> In Adts file,we will get the profile information from the header 
> itself.So,I come to know the bitstream is whether LC,Main or SSR.
> But,for raw how can we know whether the bitstream is LC,Main or SSR.
> Whether profile information is needed for the raw file format.So,how 
> can to differentiate the LC & main profile bitstreams in MPEG4 AAC for
> raw file format.
>
There is no such thing as a "raw file format", but only a 
raw_data_stream() is defined in the standard. When feeding such 
raw_data_stream() into any decoder, such decoder needs to be provided 
with the meta information like profile information and sampling rate 
from another source. It is the same problem when you store raw pcm data;
any player needs to know the meta information like the number of 
channels, the number of bits per sample, the bit order and the kind of 
quantization.
>
> And also,where can i get Erroneous bitsream & required documents for 
> the error conformace test.
>
Which "error conformance test" do you refer to?
Best regards,
Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
Fraunhofer IIS                  | Fax:   +49 9131 776 398
Am Wolfsmantel 33               |
mailto:ralph.sperschneider iis.fraunhofer.de
D 91058 Erlangen                | http://www.iis.fraunhofer.de/amm/
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