[Mp4-tech] AAC header in MP4 file format

[Mody, Mihir]

Hi Vinayak,
In case of MP4 file, the data is in raw form and its configuration
(parameteres e.g. sampling frequnecy, number of channels) etc are specified
in Audio's 'DecodeSpecificInfo' inside 'mp4a' atom.
Regards,
Mihir Mody,
Multimedia Group,
Texas Instruments Inc.,
Bangalore, India,
Email: mihir ti.com <mailto:mihir ti.com> 
Phone :- +91-80-5099307
-----Original Message-----
From: Vinayaka Hegde [mailto:vinayaka.hegde celstream.com]
Sent: Wednesday, August 06, 2023 7:50 PM
To: Mody, Mihir; 'bharat nihalani'; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] AAC header in MP4 file format
Hi,
I think Mihir is right. But how can we identify input stream in RAW form is
AAC or not? If decoder is know that, endoer is sending RAW form then only we
can procede with decoding. 
If decoder is not aware of the input bitstream type and some encoder sends
RAW form data to decoder. Is this possible?. If yes, How decoder identify
that input is AAC RAW form? Is it mandatory to have MP4 header or
MP2(ADIF/ADTS) header? 
Regards
Vinayaka
-----Original Message-----
From: Mody, Mihir [mailto:mihir ti.com]
Sent: Wednesday, August 06, 2023 7:26 PM
To: 'bharat nihalani'; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] AAC header in MP4 file format
HI Bharat,
The MP4 file contains AAC stream in RAW form. It is not possible to have
ADIF/ADTS header in AAC stream of MP4 file
Regards,
Mihir Mody,
Multimedia Group,
Texas Instruments Inc.,
Bangalore, India,
Email: mihir ti.com <mailto:mihir ti.com> 
Phone :- +91-80-5099307
-----Original Message-----
From: bharat nihalani [mailto:ban611 yahoo.com]
Sent: Wednesday, August 06, 2023 6:56 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] AAC header in MP4 file format
Hi All,
What kind of header can a MP4 file have in case of AAC?
1) ADIF, 
2) ADTS, or
3) RAW. 
I found with the MP4 file format streams that I have, that the AAC stream
was RAW, i.e. without ADIF or ADTS header in it. But is it possible to have
ADIF or ADTS header present in the MP4 file in case of AAC stream?
Please clarify on this.
Regards,
Bharat
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