[mp4-tech] format of amr data stored in .3gp file

[Dave Singer]

Hi
the documents you need are available free from  3GPP and IETF.  For 
the storage format, you need the 3GPP file format, which is a 26 
series document from www.3gpp.org.  26.234 (streaming) might also 
help.
It references the AMR RFC which is available from www.ietf.org.
At 19:09  +0100 31/08/05, mallikarjun rao wrote:
>Hello experts,
>
>
>
>Can any body tell me, the format of  amr data stored in .3gp file.?
>
>
>
>I am having MP4 parser, which is giving amr data output, for a given 
>.3gp(mpeg4 video + amr) input file.
>
>
>
>Is the amr data format type is Interface Format 1 or Interface 
>format 2 or other format?
>
>
>
>I am having a amr decoder which decodes the files either in MMS_IO 
>format or  file format  which defined in 26073 document.
>
>
>
>With these both options, it is not decoding the parser output amr data.
>
>
>
>Can you tell me how to convert a .3gp file to above to formats and 
>the parser is giving output in which format?
>
>
>
>The audio output of the parser for a .3gp file (mpeg4 video + aac), 
>I am able to decode with aac decoder and play it successfully.
>
>
>
>Thanks in advance
>
>
>
>Thanks&Regds
>
>Mallikarjun
>
>
>
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-- 
David Singer
Apple Computer/QuickTime
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