[M4IF Technotes] Start code

[Ivan Dimkovic]

Dear All,
This frame start code applies only if ADTS syncwords are used in the AAC
bitstream - some AAC decoders also accept streams without the ADTS headers
(sequences with ADIF header, or even headerless sequences)
In case of MP4 file format, also no ADTS syncwords are used.
Best Regards,
-- Ivan
----- Original Message -----
From: "Dokic, Miroslav" <miroslav.dokic   cirrus.com>
To: <cloverleafland   mail.hongkong.com>; <technotes   lists.m4if.org>
Sent: Wednesday, June 25, 2023 12:32 AM
Subject: RE: [M4IF Technotes] Start code
> Clover,
>
> MP3 and AAC do not have the start_codes in the form of 0x000001,
> rather the audio frame starts with 12 bit field 0xfff.
> This is true for both MP3 and AAC. More bits after 0xfff are
> needed
> to figure out is it MP3 or AAC (or MPEG-1/2 Layer I or II for
> that matter)
>
> Best regards,
>
> Miroslav
>
> -----Original Message-----
> From: cloverleafland   mail.hongkong.com
> [mailto:cloverleafland   mail.hongkong.com]
> Sent: Tuesday, June 24, 2023 1:31 AM
> To: technotes   lists.m4if.org
> Subject: [M4IF Technotes] Start code
>
>
> Dear all,
>
> Would any one know whether MP3 or AAC have start_code? if yes,
> what are the start code? Thanks a lot.
>
> regards,
> clover
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