@@ -168,6 +168,13 @@ void *av_mallocz(size_t size)

     return ptr;

 }

+void *av_calloc(size_t nmemb, size_t size)

+{

+    if (size <= 0 || nmemb >= INT_MAX / size)

+        return NULL;

+    return av_mallocz(nmemb * size);

+}

+

 char *av_strdup(const char *s)

 {

     char *ptr= NULL;

@@ -107,6 +107,18 @@ void av_free(void *ptr);

 void *av_mallocz(size_t size) av_malloc_attrib av_alloc_size(1);

 /**

+ * Allocate a block of nmemb * size bytes with alignment suitable for all

+ * memory accesses (including vectors if available on the CPU) and

+ * zero all the bytes of the block.

+ * The allocation will fail if nmemb * size is greater than or equal

+ * to INT_MAX.

+ * @param nmemb

+ * @param size

+ * @return Pointer to the allocated block, NULL if it cannot be allocated.

+ */

+void *av_calloc(size_t nmemb, size_t size) av_malloc_attrib;

+

+/**

  * Duplicate the string s.

  * @param s string to be duplicated

  * @return Pointer to a newly allocated string containing a