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lavu: add helper functions for integer lists.

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Add av_int_list_length() to compute a list length.
Add av_opt_set_int_list() to set a binary option.

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Nicolas George
2013-04-11 14:58:06 +02:00
committed by Michael Niedermayer
parent 3d7d819aad
commit af0d270aac
4 changed files with 58 additions and 0 deletions
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19
libavutil/utils.c
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@ -79,3 +79,22 @@ char av_get_picture_type_char(enum AVPictureType pict_type)
default: return '?';
}
}
unsigned av_int_list_length_for_size(unsigned elsize,
const void *list, uint64_t term)
{
unsigned i;
if (!list)
return 0;
#define LIST_LENGTH(type) \
{ type t = term, *l = list; for (i = 0; l[i] != t; i++); }
switch (elsize) {
case 1: LIST_LENGTH(uint8_t); break;
case 2: LIST_LENGTH(uint16_t); break;
case 4: LIST_LENGTH(uint32_t); break;
case 8: LIST_LENGTH(uint64_t); break;
default: av_assert0(!"valid element size");
}
return i;
}