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Previously, the area of a lost slice would be left at the slice number of the previous
frame which could occasionally match the number of the next slice and thus a non existing
slice could have been used for prediction leading to additional decoding errors in otherwise
undamaged slices.


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This fixes some old ogm files that had the 3rd vorbis header after a data
packet in another stream. This is invalid in ogg, but this change shouldn't
affect the behaviour of any valid file.

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If size == 1 and buf[0] == 0 and buf[1] == 0 (the first byte after the
buffer), it would set size = -1 and crash in the later memcpy.


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Change default speed back to a slower variant.


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instead of using the original host name


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This takes into account whether the granule defines the start or end times
of packets, and sets the correct file offset of the associated page.

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(skeleton will need them)

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Otherwise it gets set automatically to a page midstream and prevents seeking
to the first page.

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Replace SDL timer by a seperate thread, more accurate and less annoying.
frame drop is enabled by default, bug reports welcome.
Fixes issue1191


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w53_32_c() and w97_32_c() are defined as stubs when snow encoder is
disabled.  In this case, those functions are not referenced at all
and do thus not need to be defined.

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These casts are correct and safe.  The pointers are guaranteed to
have proper alignment, and aliasing is not a problem with character
types.

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