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

[mallikarjun rao]

Hi Dave,
Thank you very much. It helps me alot..
Regds
Mallikarjun
Dave Singer <singer apple.com> wrote:
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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