[Mp4-tech] AMR payload&Storage format

[Dave Singer]

At 8:05 AM -0700 9/20/04, Mehdi Sharifi wrote:
>Hi ,
>thanks for replying ,
>   in 3GPP file format  it is said that  format of  AMR samples  is 
>according to RFC 3267 ; I read RFC 3267 ; it was alittle complicated 
>; I am looking for a source or some contribution  to convert  this 
>payload format to  ordinary AMR format  in order to  play it with 
>QuickTime  or  another  player
>
>if you can help me , it's very appriciated
>
>thank you alot
>--mehdi

Well converting an RTP stream to a file format is a moderate amount 
of work.  In a 3GPP file, each media track is constructed as a 
sequence of timed samples.  The duration of AMR frames is constant 
(20ms as I recall).  The media data (as represented by the sample 
sizes etc.) is stored as 'samples' (frames).  Each sample consists of 
a set of AMR frames (as indicated by the frames-per-sample value), 
contiguously stored, in the 'storage format' , however, there is no 
magic number stored within the samples;  that is, each sample is just 
a contiguous set of AMR frames.
>
>"Mody, Mihir" <mihir ti.com> wrote:
>
>Hi Mehdi,
>
>Are you refering to storage format as per RFC 3267 or 3GPP file 
>format based on MPEG4 File format?
>
>Regards,
>Mihir Mody,
>Multimedia codecs group,
>Texas Instruments India, Ltd,
>Email : <mailto:mihir ti.com>mihir ti.com
>Phone : +91-80-25099307
>
>-----Original Message-----
>From: mp4-tech-bounces lists.mpegif.org 
>[mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Mehdi Sharifi
>Sent: Monday, September 20, 2023 7:07 PM
>To: mp4-tech lists.mpegif.org
>Subject: [Mp4-tech] AMR payload&Storage format
>
>   Hi dear all,
>   format of AMR  in storage is abit different from it's format  in 
>payload or streaming .  is there any source code  that I can use to 
>convert  payload format to storage format ?
>
>thanx
>     --mehdi
>
>
>
>Do you Yahoo!?
><http://us.rd.yahoo.com/mail_us/taglines/100/*http://promotions.yahoo.com/new_mail/static/efficiency.html>New 
>and Improved Yahoo! Mail - 100MB free storage!
>
>
>
>Do you Yahoo!?
><http://us.rd.yahoo.com/mail_us/taglines/50x/*http://promotions.yahoo.com/new_mail/static/efficiency.html>Yahoo! 
>Mail - 50x more storage than other providers!
>
>_______________________________________________
>NOTE: Please use clear subject lines for your posts. Include [audio, 
>[video], [systems], [general] or another apppropriate identifier to 
>indicate the type of question you have.
>
>Note: Conduct on the mailing list is subject to the Antitrust 
>guidelines found at 
>http://www.mpegif.org/public/documents/vault/mp-out-30042-Antitrust.php

-- 
David Singer
Apple Computer/QuickTime
-------------- next part --------------
An HTML attachment was scrubbed...
URL: /pipermail/mp4-tech/attachments/20040921/3c6437b4/attachment.html