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avutil: Add functions for allocating opaque contexts for algorithms

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The current API where the plain size is exposed is not of much
use - in most cases it is allocated dynamically anyway.

If allocated e.g. on the stack via an uint8_t array, there's no
guarantee that the struct's members are aligned properly (unless
the array is overallocated and the opaque pointer within it
manually aligned to some unspecified alignment).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-10-11 15:08:04 +03:00
parent fb32f31af7
commit 9a92aea27b
10 changed files with 78 additions and 5 deletions
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7
libavutil/tree.c
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@ -28,7 +28,14 @@ typedef struct AVTreeNode {
int state;
} AVTreeNode;
#if FF_API_CONTEXT_SIZE
const int av_tree_node_size = sizeof(AVTreeNode);
#endif
struct AVTreeNode *av_tree_node_alloc(void)
{
return av_mallocz(sizeof(struct AVTreeNode));
}
void *av_tree_find(const AVTreeNode *t, void *key,
int (*cmp)(void *key, const void *b), void *next[2])