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memory: fix alignment calculations

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Fix the alignment calculation.
Improve documentation.
This commit is contained in:
Wim Taymans 2011-06-02 18:13:33 +02:00
parent d2d23074af
commit c8fc05743d
1 changed files with 7 additions and 2 deletions
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9
gst/gstmemory.c
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@ -131,7 +131,7 @@ _default_mem_new_block (gsize maxsize, gsize align, gsize offset, gsize size)
data = (guint8 *) mem + sizeof (GstMemoryDefault);
if ((aoffset = ((guintptr) data & align)))
aoffset = align - aoffset;
aoffset = (align + 1) - aoffset;
_default_mem_init (mem, 0, NULL, slice_size, data, NULL, maxsize + align,
aoffset + offset, size);
@ -405,9 +405,12 @@ gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data,
* @maxsize: allocated size of @data
* @align: alignment for the data
*
* Allocate a new memory block with memory that is at least @maxsize big and las
* Allocate a new memory block with memory that is at least @maxsize big and has
* the given alignment.
*
* @align is given as a bitmask so that @align + 1 equals the amount of bytes to
* align to. For example, to align to 8 bytes, use an alignment of 7.
*
* Returns: a new #GstMemory.
*/
GstMemory *
@ -415,6 +418,8 @@ gst_memory_new_alloc (gsize maxsize, gsize align)
{
GstMemoryDefault *mem;
g_return_val_if_fail (((align + 1) & align) == 0, NULL);
mem = _default_mem_new_block (maxsize, align, 0, maxsize);
return (GstMemory *) mem;