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Tweak dual layer detection heuristic.

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Was not working with Wild Arms: Alter Code F.
This commit is contained in:
Jean-Philip Desjardins 2017-07-22 12:46:06 -04:00
parent e09079c211
commit 722459177f
1 changed files with 5 additions and 1 deletions
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6
Source/OpticalMedia.cpp
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@ -66,7 +66,11 @@ void COpticalMedia::CheckDualLayerDvd(const StreamPtr& stream)
//We need to look for the start of the second layer
//The second layer is at most as big as the first one, so
//we can start looking from half of the disk image
auto searchBlockAddress = imageBlockCount / 2;
//NOTE: Wild Arms: Alter Code F seems to have a second layer that's a bit
//larger than the first one? That's why we start looking at 15 / 32 of the image's size
auto searchBlockAddress = imageBlockCount * 15 / 32;
stream->Seek(static_cast<uint64>(searchBlockAddress) * blockSize, Framework::STREAM_SEEK_SET);
//Scan all blocks from the search point, looking for a valid ISO9660 descriptor