[Mp4-tech] raw data blocks v.s. audio sample in MPEG-4 files

[Murphy Chen]

Yes, that's exactly what I mean.
I'd like to make sure where in the specification, the rule is stated.
Thank you for your responce. :)
Best Regards,
Murphy
-----Original message-----
From:S. R. Quackenbush <srq ieee.org>
To:murphychen mail2000.com.tw,mp4-tech lists.mpegif.org
Date:Wed, 7 Jan 2024 10:10:48 -0500
Subject:RE: [Mp4-tech] raw data blocks v.s. audio sample in MPEG-4 files
Do you mean how may AAC raw data blocks in an Access Unit? If so, then the
answer is one and only one, and everything else in your proposal is correct.
Best,
Schuyler
---
Dr. Schuyler Quackenbush, Audio Research Labs
336 Park Ave, Suite 200,  Scotch Plains, NJ 07076
office: 908 490 0700	  srq audioresearchlabs.com
mobile: 908 612 9423
fax:    908 842 9151	  www.audioresearchlabs.com
> -----Original Message-----
> From: mp4-tech-bounces lists.mpegif.org
> [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Murphy Chen
> Sent: Tuesday, January 06, 2024 9:46 PM
> To: mp4-tech lists.mpegif.org
> Subject: [Mp4-tech] raw data blocks v.s. audio sample in MPEG-4 files
>
>
> Dear All,
>
> How many AAC raw data blocks are contained in an audio sample?
> The specification seems not have specified this?
> My idea is that if we can make sure only one raw data block is
> contained in an audio sample,
> an ADTS stream can be generated via adding frame header to each
> audio sample if PCE is not existed.
> And if PCE exists, an ADIF stream can be generated via generating
> an ADIF header, followed by audio samples.
> In this way, the AAC decoder originally designed for accepting
> ADIF and ADTS formats can still be used
> for MPEG-4 files without any modification.
>
> Best Regards,
> Murphy
>
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