[Mp4-tech] .mp4 audio file format

[Dave Singer]

At 6:36  +0100 5/10/05, Deshpande,Vishvanath wrote:
>Friends ,
>Do you know what is the .mp4 file structure for audio
>?
>I have a AAC decoder which decodes .adts and .adif
>files.I wanted to know the parsing routine for .mp4
>file as well. Can u ppl tell me abt it OR where i will
>get it from ?

you need iso/iec 14496-12 and 14496-14.  The former is free from the 
iso web site, and may be enough.  Look also for open source projects 
etc. that support the MP4 file format (I know there is at least one).
Best wishes
>
>Thanks,
>vD
>--- Umang Garg <ugarg neomagic.com> wrote:
>
>>  Friends,
>>
>>  HE-AAC testing requires conformance to AAC-LC
>>  conformance criterion
>>  along with conformance to SBR normative test
>>  streams.
>>
>>  Both categories of test streams are available at:
>>
>ftp://mpaudconf:adif2mp4@ftp.iis.fhg.de/mpeg4audio-conformance
>>
>>  Two folders of interest at the aforesaid FTP site
>>  are :  compressedMp4
>>  and  referencesWav.
>>
>>  AAC-LC test streams are of the form al<xxx>.mp4, and
>>  SBR test streams
>>  are of the form al_sbr<yyy>.mp4
>>
>>  These streams can also be bought from the ISO along
>>  with the Conformance
>>  document(ISO/IEC 14496-4). The Conformance
>>  document(ISO/IEC 14496-4) is
>>  not available at the FTP site.
>>
>>  I hope that the above information is useful.
>>
>>  Best Regards,
>>  Umang Garg
>>
>>  NeoMagic Corporation, based in Santa Clara,
>>  California, enables new
>>  generations of handheld systems with its Multimedia
>>  Processors that are
>>  designed to offer the lowest power, smallest
>>  form-factor and best
>>  multimedia features and performance. The company is
>>  a pioneer in the
>>  integration of complex logic, memory and analog
>>  circuits into
>>  single-chip solutions. Information on the company
>>  may be found on the
>>  World Wide Web at www.neomagic.com.
>>
>>
>>
>>  Gautam Moharir wrote:
>>
>>  >
>>  >U can get HEAAC (AAC + SBR) test streams from
>>
>>http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC%2014496
>>  >-4_2004_Amd_8_2005_Bitstreams/
>>  >
>>  >Gautam S. Moharir
>>  >NVIDIA Graphics Pvt. Ltd.
>>  >Floors 1-4, Muttha Chambers II
>>  >Senapati Bapat Road
>>  >Pune  411046
>>  >India
>>  >
>>  >
>>  >
>>  >------------------------------
>>  >
>>  >Message: 2
>>  >Date: Wed, 28 Sep 2023 06:22:58 +0100 (BST)
>>  >From: "Deshpande,Vishvanath" <vishu_dash yahoo.com>
>>  >Subject: [Mp4-tech] re : AAC conformance streams
>>  >To: mp4-tech lists.mpegif.org
>>  >Message-ID:
>>  <20050928052258.71934.qmail web60711.mail.yahoo.com>
>>  >Content-Type: text/plain; charset=iso-8859-1
>>  >
>>  >Hi ,
>>  >
>>  >Can any one of you tell me where to get the
>>  complete
>>  >set of AAC conformance streams ?
>>  >I want to test the HEAAC (AAC + SBR) decoder
>>  fully.So
>>  >it would be greatful if ne one of you let me know
>>  >where i find these streams.
>>  >
>>  >If we need to buy these from ISO , then please let
>>  me
>>  >know the url link for the same .
>>  >
>>  >Thanks in advance ,
>>  >
>>  >Best Regards ,
>>  >-Vishvanath
>>  >
>>  >
>>  >
>>  >
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>>  > 
>>  >
>>
>
>
>
>
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-- 
David Singer
Apple Computer/QuickTime