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A symbol starting with two leading underscores is reserved for
the compiler/standard library implementation.
Also remove the trailing two double underscores for consistency
and symmetry.
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This fixes failures when an OBU has more than a byte's worth of
trailing zeros.
As part of this work, it also rejigs the dav1d_flush_get_bits function
slightly. This worked before, but it wasn't very obvious why (it
worked because bits_left was never more than 7). This patch renames it
to dav1d_bytealign_get_bits, which makes it clearer what it does and
adds a comment explaining why it works properly.
The new dav1d_bytealign_get_bits is also now void (rather than
returning the next byte to read). The patch defines
dav1d_get_bits_pos, which returns the current bit position. This feels
a little easier to reason about.
We also add a new check to make sure that we haven't fallen off the
end of the OBU. This can happen when a byte buffer contains more than
one OBU: the GetBits might not have got to EOF, but we might now be
half-way through the next OBU.
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Calling get_uniform(max=1) results in a read_bits(n=0),
In get_uniform, the n param is renamed to max to clarify the
semantics. Asserts are added to detect calls to get_uniform()
and get_bits() that don't actually read anything.
Closes #76
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With minor contributions from:
- Jean-Baptiste Kempf <jb@videolan.org>
- Marvin Scholz <epirat07@gmail.com>
- Hugo Beauzée-Luyssen <hugo@videolan.org>
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