dxr3plugin analog audio output with dvdplugin - vdr

8 Apr 2005


      Hi All,
Frustrated by the fact that dvd AC3 audio via the dxr3's analog output 
hasn't been working for a while I had a bit of a look into the source 
code and managed to get it going. I'm using vdr-1.3.21, dxr3plugin CVS 
(vdr-dxr3-0-2 branch) and dvdplugin latest CVS.
The problem seems to be that the dxr3 plugin  won't  decode an LPCM 
audio stream. The dvd AC3 audio is downmixed to a PCM stream by the 
dvdplugin when UseDolbyDigital is set to "no" in vdr setup.
My quick and dirty hack was to make a minor change in dxr3demuxdevice.c 
at around line 510.
Here we have :
else if (pesFrame.GetPesDataType() == cDxr3PesFrame::PES_PRIVATE_DATA
                              && m_demuxMode != DXR3_DEMUX_VIDEO_ONLY_MODE
                              && !cDxr3ConfigData::Instance().GetAc3OutPut()
                              && !bAc3Dts)
if we omit the check for bAc3Dts...
else if (pesFrame.GetPesDataType() == cDxr3PesFrame::PES_PRIVATE_DATA
                              && m_demuxMode != DXR3_DEMUX_VIDEO_ONLY_MODE
                              && 
!cDxr3ConfigData::Instance().GetAc3OutPut())
//                            && !bAc3Dts)
we get working analog audio from AC3 and PCM dvds.
This isn't intended as a permanent fix since I'm assuming that the 
private stream always contains PCM data, if it doesn't vdr crashes 
immediately. Hopefully someone will write a proper patch to fix it soon.