Merge commit 'cce3e0a49f0dd030262c28d9c53de0bd2fd909c4'

* commit 'cce3e0a49f0dd030262c28d9c53de0bd2fd909c4':
  Move av_fast_{m,re}alloc from lavc to lavu.

Conflicts:
	libavcodec/avcodec.h
	libavcodec/utils.c
	libavutil/mem.c
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

3 files changed, 61 insertions, 1 deletions

diff --git a/libavutil/mem.c b/libavutil/mem.c
index 5aad97aa93..10b0137a7e 100644
--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -38,6 +38,7 @@
 
 #include "avassert.h"
 #include "avutil.h"
+#include "common.h"
 #include "intreadwrite.h"
 #include "mem.h"
 
@@ -463,3 +464,41 @@ void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
     }
 }
 
+void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
+{
+    if (min_size < *size)
+        return ptr;
+
+    min_size = FFMAX(17 * min_size / 16 + 32, min_size);
+
+    ptr = av_realloc(ptr, min_size);
+    /* we could set this to the unmodified min_size but this is safer
+     * if the user lost the ptr and uses NULL now
+     */
+    if (!ptr)
+        min_size = 0;
+
+    *size = min_size;
+
+    return ptr;
+}
+
+static inline int ff_fast_malloc(void *ptr, unsigned int *size, size_t min_size, int zero_realloc)
+{
+    void **p = ptr;
+    if (min_size < *size)
+        return 0;
+    min_size = FFMAX(17 * min_size / 16 + 32, min_size);
+    av_free(*p);
+    *p = zero_realloc ? av_mallocz(min_size) : av_malloc(min_size);
+    if (!*p)
+        min_size = 0;
+    *size = min_size;
+    return 1;
+}
+
+void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
+{
+    ff_fast_malloc(ptr, size, min_size, 0);
+}
+
diff --git a/libavutil/mem.h b/libavutil/mem.h
index 77b7adc373..703ce81936 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -336,6 +336,27 @@ void av_max_alloc(size_t max);
 void av_memcpy_backptr(uint8_t *dst, int back, int cnt);
 
 /**
+ * Reallocate the given block if it is not large enough, otherwise do nothing.
+ *
+ * @see av_realloc
+ */
+void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
+
+/**
+ * Allocate a buffer, reusing the given one if large enough.
+ *
+ * Contrary to av_fast_realloc the current buffer contents might not be
+ * preserved and on error the old buffer is freed, thus no special
+ * handling to avoid memleaks is necessary.
+ *
+ * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
+ * @param size size of the buffer *ptr points to
+ * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
+ *                 *size 0 if an error occurred.
+ */
+void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
+
+/**
  * @}
  */
 
diff --git a/libavutil/version.h b/libavutil/version.h
index bd5e7b88e3..05c79fac1a 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -75,7 +75,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR  52
+#define LIBAVUTIL_VERSION_MINOR  53
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \