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lavu/fifo: fix a corner case in av_fifo_grow2()

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When the fifo is grown by exactly the current write offset, it would end
up with offset_w = nb_elems. If av_fifo_write_from_cb() is called in
such a state, the user callback would get callled with *nb_elems=0,
which will then cause the write to return without writing anything.
This commit is contained in:
Anton Khirnov 2022-02-08 19:13:45 +01:00
parent 73b01844c2
commit e9acff8a01
1 changed files with 1 additions and 1 deletions
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2
libavutil/fifo.c
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@ -115,7 +115,7 @@ int av_fifo_grow2(AVFifo *f, size_t inc)
(f->offset_w - copy) * f->elem_size); (f->offset_w - copy) * f->elem_size);
f->offset_w -= copy; f->offset_w -= copy;
} else } else
f->offset_w = f->nb_elems + copy; f->offset_w = copy == inc ? 0 : f->nb_elems + copy;
} }
f->nb_elems += inc; f->nb_elems += inc;