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lavc: add av_fast_padded_mallocz

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-07-10 03:49:44 +00:00
parent ca16f88c75
commit 0e003d8c91
3 changed files with 21 additions and 0 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2011-04-18
API changes, most recent first:
2012-07-10 - xxxxxxx - lavc 54.33.100
Add av_fast_padded_mallocz().
2012-07-10 - xxxxxxx - lavfi 3.2.0 - avfilter.h
Add init_opaque() callback to AVFilter struct.

6
libavcodec/avcodec.h
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@ -4601,6 +4601,12 @@ void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
*/
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
/**
* Same behaviour av_fast_padded_malloc except that buffer will always
* be 0-initialized after call.
*/
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
/**
* Encode extradata length to a buffer. Used by xiph codecs.
*

12
libavcodec/utils.c
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@ -100,6 +100,18 @@ void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
memset(*p + min_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
{
uint8_t **p = ptr;
if (min_size > SIZE_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
av_freep(p);
*size = 0;
return;
}
if (!ff_fast_malloc(p, size, min_size + FF_INPUT_BUFFER_PADDING_SIZE, 1))
memset(*p, 0, min_size + FF_INPUT_BUFFER_PADDING_SIZE);
}
/* encoder management */
static AVCodec *first_avcodec = NULL;