[mythtv-commits] Ticket #2703: Localtime is sent to CAM module instead of timestamp from MPEG stream

[MythTV]

#2703: Localtime is sent to CAM module instead of timestamp from MPEG stream
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 Reporter:  david at hardeman.nu  |        Owner:  danielk
     Type:  defect             |       Status:  closed 
 Priority:  trivial            |    Milestone:  0.21   
Component:  dvb                |      Version:  head   
 Severity:  low                |   Resolution:  fixed  
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Changes (by danielk):

  * status:  reopened => closed
  * resolution:  => fixed

Comment:

 (In [12439]) Fixes #2703. Adds PSIP UTC time handling.

  * Adds DVB TDT parsing
  * Adds accurate time estimation based on DVB TDT and ATSC STT time.
  * Passes the accurate time delta to the Conditional Access Module class
  * Adds code to the CAM class to so that it can pass the correct time
    to the CAM wrt to what time the station thinks it is (which can be
    several seconds off from our time even when using NTP.)
  * Moves time handling function to util so it can be shared by the
    new code and the existing time methods in EITHelper.

 The DVB spec says that the CAM must be given accurate time WRT to the
 transmission time of the stream, if either our clock was off or the
 transmitters time was off then the old code did not do this because we
 just sent our UTC time to the CAM. With this code we calculate the offset
 between our time and DVB time and use that to adjust the code we send to
 the CAM. This change should prevent us from losing more than a second of
 data when the CAM encryption changes during the transmission of a program
 we are recording.

 The ATSC time offset is just a bonus since the computation is performed in
 mpegstreamdata, but this and the DVB time offset could be used to set the
 local clock.

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Ticket URL: <http://cvs.mythtv.org/trac/ticket/2703#comment:12>
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