[FFmpeg-devel] [PATCH] Add --malloc-prefix to apply a prefix to malloc, free etc

Mans Rullgard mans
Wed Jan 27 18:42:29 CET 2010

This makes it easy to use a replacement allocator instead of the
system default one.
 configure       |    9 +++++++--
 libavutil/mem.c |   17 +++++++++++++++++
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 71ae555..bd19ea9 100755
--- a/configure
+++ b/configure
@@ -231,6 +231,7 @@ Advanced options (experts only):
   --disable-vis            disable VIS optimizations
   --disable-yasm           disable use of yasm assembler
   --enable-pic             build position-independent code
+  --malloc-prefix=PFX      prefix malloc and related names with PFX
 Developer options (useful when working on FFmpeg itself):
   --disable-debug          disable debugging symbols
@@ -1108,6 +1109,7 @@ CMDLINE_SET="
+    malloc_prefix
@@ -2424,9 +2426,9 @@ check_func  gethrtime
 check_func  getrusage
 check_func  inet_aton $network_extralibs
 check_func  isatty
-check_func  memalign
+check_func  ${malloc_prefix}memalign            && enable memalign
 check_func  mkstemp
-check_func  posix_memalign
+check_func  ${malloc_prefix}posix_memalign      && enable posix_memalign
 check_func_headers io.h setmode
 check_func_headers lzo/lzo1x.h lzo1x_999_compress
 check_func_headers windows.h GetProcessTimes
@@ -2973,6 +2975,9 @@ cat > $TMPH <<EOF
 #define EXTERN_ASM ${extern_prefix}
+test -n "$malloc_prefix" &&
+    echo "#define MALLOC_PREFIX $malloc_prefix" >>$TMPH
 if enabled small || disabled optimizations; then
     echo "#define av_always_inline"  >> $TMPH
diff --git a/libavutil/mem.c b/libavutil/mem.c
index 741450b..d5e03f8 100644
--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -33,6 +33,7 @@
 #include <malloc.h>
+#include "avutil.h"
 #include "mem.h"
 /* here we can use OS-dependent allocation functions */
@@ -40,6 +41,22 @@
 #undef malloc
 #undef realloc
+#define malloc         AV_JOIN(MALLOC_PREFIX, malloc)
+#define memalign       AV_JOIN(MALLOC_PREFIX, memalign)
+#define posix_memalign AV_JOIN(MALLOC_PREFIX, posix_memalign)
+#define realloc        AV_JOIN(MALLOC_PREFIX, realloc)
+#define free           AV_JOIN(MALLOC_PREFIX, free)
+extern void *malloc(size_t size);
+extern void *memalign(size_t align, size_t size);
+extern int   posix_memalign(void **ptr, size_t align, size_t size);
+extern void *realloc(void *ptr, size_t size);
+extern void  free(void *ptr);
+#endif /* MALLOC_PREFIX */
 /* You can redefine av_malloc and av_free in your project to use your
    memory allocator. You do not need to suppress this file because the
    linker will do it automatically. */

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