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* Adding some heuristic error correction to the j2k decoder module to combat some of the situations that we see in mantis 3049 . 

* This may help people on certain 64 bit systems where the end byte position of each layer data packet is incorrect but the start positions are correct.
* The console will still be extremely chatty with 'Inconsistent packet data in JPEG2000 stream:' messages, however..  if OpenSimulator was able to recover the data, it will say HURISTICS SUCCEEDED
0.6.5-rc1
Teravus Ovares 2009-03-28 20:50:08 +00:00
parent 4f6c4378da
commit b857635712
1 changed files with 83 additions and 1 deletions
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84
OpenSim/Region/CoreModules/Agent/TextureSender/J2KDecoderModule.cs
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@ -211,7 +211,89 @@ namespace OpenSim.Region.CoreModules.Agent.TextureSender
else
{
m_log.WarnFormat("[J2KDecoderModule]: JPEG2000 texture decoding failed for {0}", AssetId);
/*
Random rnd = new Random();
// scramble ends for test
for (int i = 0; i < texture.LayerInfo.Length; i++)
{
texture.LayerInfo[i].End = rnd.Next(999999);
}
*/
// Try to do some heuristics error correction! Yeah.
bool sane2Heuristics = true;
if (texture.LayerInfo.Length == 0)
sane2Heuristics = false;
if (sane2Heuristics)
{
// Last layer start is less then the end of the file and last layer start is greater then 0
if (texture.LayerInfo[texture.LayerInfo.Length - 1].Start < texture.AssetData.Length && texture.LayerInfo[texture.LayerInfo.Length - 1].Start > 0)
{
}
else
{
sane2Heuristics = false;
}
}
if (sane2Heuristics)
{
int start = 0;
// try to fix it by using consistant data in the start field
for (int i = 0; i < texture.LayerInfo.Length; i++)
{
if (i == 0)
start = 0;
if (i == texture.LayerInfo.Length - 1)
texture.LayerInfo[i].End = texture.AssetData.Length;
else
texture.LayerInfo[i].End = texture.LayerInfo[i + 1].Start - 1;
// in this case, the end of the next packet is less then the start of the last packet
// after we've attempted to fix it which means the start of the last packet is borked
// there's no recovery from this
if (texture.LayerInfo[i].End < start)
{
sane2Heuristics = false;
break;
}
if (texture.LayerInfo[i].End < 0 || texture.LayerInfo[i].End > texture.AssetData.Length)
{
sane2Heuristics = false;
break;
}
if (texture.LayerInfo[i].Start < 0 || texture.LayerInfo[i].Start > texture.AssetData.Length)
{
sane2Heuristics = false;
break;
}
start = texture.LayerInfo[i].Start;
}
}
if (sane2Heuristics)
{
layers = texture.LayerInfo;
fCache.SaveFileCacheForAsset(AssetId, layers);
// Write out decode time
m_log.InfoFormat("[J2KDecoderModule]: HEURISTICS SUCCEEDED {0} Decode Time: {1}", Environment.TickCount - DecodeTime,
AssetId);
}
else
{
m_log.WarnFormat("[J2KDecoderModule]: JPEG2000 texture decoding failed for {0}", AssetId);
}
}
texture = null; // dereference and dispose of ManagedImage
}