[mythtv-commits] Ticket #11564: Feature patch to increase read size in hdhrstreamhandler.cpp

[MythTV]

#11564: Feature patch to increase read size in hdhrstreamhandler.cpp
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     Reporter:  Gary Buhrmaster                  |      Owner:  danielk
  <gary.buhrmaster@…>                            |     Status:  new
         Type:  Patch - Feature                  |  Milestone:  unknown
     Priority:  minor                            |    Version:  Master Head
    Component:  MythTV - DVB                     |   Keywords:
     Severity:  medium                           |
Ticket locked:  0                                |
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 In ticket #10414 ( patch
 http://code.mythtv.org/trac/changeset/2be3dd91fba8d438cb25d81a1ba9d0d5e8657fb6/mythtv
 ) the patch increased the buffersize for the hdhr.  This was ineffective
 in that patch, since that particular variable was no longer used.  This
 patch increases the maximum returned read size to be 1/8 of a second of
 potential buffer (implementing, partially, what I believe the original
 ticket was intended to do).  With the presumption that the loop *is*
 executed around 20 ms (the usleep counter) the current 64KB read limit,
 with a high bitrate stream (which can produce ~100KB in 20ms), can result
 in 3 or 4 calls through the hdhr library to read all the buffered data.
 Increasing the amount of data to examine to the 1/8 second value (~300KB)
 results in reducing the number of calls to 2 or 3 potentially reducing the
 lock overheads (whether it is the higher value will depend on whether a
 new packet arrived while processing the existing set of packets, and lower
 bitrate content (a more common case) will show no improvement).

 Patch:

 https://github.com/garybuhrmaster/mythtv/commit/e25720a96f35d794209f5b0f3369086e187756ff

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Ticket URL: <http://code.mythtv.org/trac/ticket/11564>
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