[Mp4-tech] how to play .aac fille with adif header

[Raghavendra K M]

i had added adif ( adts too )header to raw encoded bitstream ..and was able
to play with latest version of winamp... this was for mpeg2 AAC- LC
hope this solves ur problem
-Raghu
On 11/23/06, rgomathi sarayusoftech.com <rgomathi sarayusoftech.com> wrote:
>
> >Hi Apoorva.....
>    Thanks for your reply.....
>    Actually I'm working in Mp4 file format.In the mpeg systems doc....in
> object type indication it is given that for 0x6b,0x69 the stream
> comply to mpeg1 audio and mpeg2 audio.....So once i got that info i
> came to know that the audio stream is mpeg1 or mpeg2 audio and i'll
> parse the stream as such without any decoderSpecificInfo as the
> mpeg1,mpeg2 (layers I,II,III) audio streams itself contains all the
> info needed for decoder.
>    I do see streams (.mp4 file) with .mp3(inside the moov atom) and
> there is no esds atom....so how to parse this stream..... is there any
> more codec like this....please guide me experts .....
>
> Thanks in advance
> Regards,
> Gomathi.
>
>
>
> Hello Gomathi,
> >
> > AAC bit stream according to the standard, contains only syntactic
> > elements (SCE, CPE, LFE, DSE, PCE, FILL, CCE, TERM). So if an AAC
> > decoder is developed, it will be implemented to support and decode the
> > syntactic elements compulsorily. Let us call the AAC containing only
> > syntactic elements as "Raw AAC".
> >
> > When we consider ADTS or ADIF, these are headers which provide
> > information about the bit stream like sampling rate, channels, etc. And
> > these headers (ADTS, ADIF) are not the only format, AAC bit stream could
> > be encapsulated in. Raw AAC can even be a part of MP4 transport stream,
> > in which the data like Sampling rate and channels will be a part of
> > configuration information.
> >
> > So, if a player has AAC decoder but, do not have the implementation to
> > decode the headers (ADTS, ADIF) then, the player can very well decode
> > the "Raw AAC" (information of Sampling rate will have to be provided by
> > the user) but, will not be in a position to decode the AAC with ADTS or
> > ADIF header.
> >
> > Hope this helps,
> > Apoorva Ankad
> >
> > -----Original Message-----
> > From: rgomathi sarayusoftech.com [mailto:rgomathi sarayusoftech.com]
> > Sent: Wednesday, November 22, 2023 2:37 PM
> > To: Deshpande, Vishvanath; mp4-tech lists.mpegif.org;
> > mp4-tech-request lists.mpegif.org
> > Subject: Re: [Mp4-tech] how to play .aac fille with adif header
> >
> >>
> > Hi all....
> >    Thanks a lot for ur replies.can i know the reason behind why only
> > certain players  could play the .acc with ADIF header.B'coz both ADIF
> > and ADTS headers can be used to create .aac file in general.I think the
> > only difference being one time ADIF header for the whole stream and
> > ADTS for every frame.If i'm correct why the normal players couldn't
> > play that.is there any special thing the decoder should do to decode
> > aac stream with adif.....expecting replies...
> >
> > Thanks in advance,
> >
> > regards,
> > Gomathi.
> >
> >
> > Hi,
> >>
> >> You can use Cool Edit to play that,
> >>
> >> -Vishvanath
> >>
> >>
> >>
> >> ----- Original Message ----
> >> From: "rgomathi sarayusoftech.com" <rgomathi sarayusoftech.com>
> >> To: mp4-tech lists.mpegif.org; mp4-tech-request lists.mpegif.org
> >> Sent: Tuesday, 21 November, 2006 3:58:41 PM
> >> Subject: [Mp4-tech] how to play .aac fille with adif header
> >>
> >>
> >> Hi all......
> >>    I badly want to know how to play .aac file with adif header.for the
> >> same raw data with adts header most of the players like vlc,quick time
> >> players play exactly well.but if i put adif header for the same even
> >> VLC 8.5 doen't play.would i do somthing special to play this in
> >> vlc....please guide me experts...expecting replies asap...
> >>
> >> Thanks in advance
> >> Gomathi
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