Merged revisions 269821 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r269821 | mmichelson | 2010-06-10 14:30:12 -0500 (Thu, 10 Jun 2010) | 19 lines
  
  Fix potential crash when writing raw SLIN audio on a PLC-enabled channel.
  
  The issue here was that the frame created when adjusting for PLC had no offset
  to its audio data. If this frame were translated to another format prior to
  being sent out an RTP socket, all went well because the translation code would
  put an appropriate offset into the frame. However, if the SLIN audio were not
  translated before being sent out the RTP socket, bad things would happen.
  Specifically, the ast_rtp_raw_write makes the assumption that the frame has
  at least enough of an offset that it can accommodate an RTP header. This was
  not the case. As such, data was being written prior to the allocation, likely
  corrupting the data the memory allocator had written. Thus when the time came
  to free the data, all hell broke loose. ....Well, Asterisk crashed at least.
  
  The fix was just what one would expect. Offset the data in the frame by a reasonable
  amount. The method I used is a bit odd since the data in the frame is 16 bit integers
  and not bytes. I left a big ol' comment about it. This can be improved on if someone
  is interested. I was more interested in getting the crash resolved.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@269822 65c4cc65-6c06-0410-ace0-fbb531ad65f3

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