Re: 96kHz 24bit WAV playback

Greg Wright wrote:
> John Stirling wrote:
>> Hi Greg,
>>
>> Full log attached.
>>
>> The line -
>> audrend.cpp:WriteToAudioServices OK t=5720
>>
>
> First, it would be helpful if the logs has timestamps
> at the beginning of each line (HX_TICKCOUNT()). This helps
> us track time between calls, which can point to certain
> problems. Next, from part of the log:
ok i'll try to add that to any future logs

>
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1483776
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1483776
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1497600
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1497600
> wvffplin.cpp:GetPacket
> wvffplin.cpp:RIFFReadDone s=11520 st=5 286 df=(nil)
> wvffplin.cpp:RIFFReadDone ->PacketReady t=5700
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1497600
> audrend.cpp:OnPacket to=0 t=5700 s=11520
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1497600
> audlinux_oss.cpp:_SyncUpTimeStamps c=0
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1382400
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1382400
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1382400
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1396224
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1396224
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1396224
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1396224
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
> audlinux_oss.cpp:_GetBytesActualyPlayed c=1400832
>
>
>
>
> Why would GetBytesActualyPlayed() go backwards? 1497600-->1382400?
>
>
> Is any rebuffering going on, any pausing? In normal continuous
> playback, that should just be increasing. It is how we generate
> the timeline. I would certainly printout the values from
> getcurrenttime() and make sure it looks good, my guess is that
> it does not.
There's no rebuffering or pausing. GetTickTime() looks ok.

I think maybe WriteBytes is not getting called regularly enough or the 
amount of data in that call is not correct. 

WriteBytes gets called
GetBytesActuallyPlayed gets called a few times
WriteBytes gets called again, but SyncUpTimestamps intervenes to reduce 
the BytesActuallyPlayed count.

Does that sound like a renderer problem ? Or fileformat ? (or neither)

>
> Is there some bad math, due to 24 bits/sample, or perhaps some
> wrap around (INT overflow) happening in the OSS code? It should
> be easy to check.
>
> --greg.
>