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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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12
libavutil/tree.h
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@ -27,6 +27,9 @@
#ifndef AVUTIL_TREE_H
#define AVUTIL_TREE_H
#include "attributes.h"
#include "version.h"
/**
* @addtogroup lavu_tree AVTree
* @ingroup lavu_data
@ -40,7 +43,14 @@
struct AVTreeNode;
extern const int av_tree_node_size;
#if FF_API_CONTEXT_SIZE
extern attribute_deprecated const int av_tree_node_size;
#endif
/**
* Allocate an AVTreeNode.
*/
struct AVTreeNode *av_tree_node_alloc(void);
/**
* Find an element.