+
+/* Planar 8-bit grayscale */
+#define FOURCC_GREY VLC_FOURCC('G','R','E','Y')
+#define FOURCC_Y800 VLC_FOURCC('Y','8','0','0')
+#define FOURCC_Y8 VLC_FOURCC('Y','8',' ',' ')
+
+/* Alignment of critical dynamic data structure
+ *
+ * Not all platforms support memalign so we provide a vlc_memalign wrapper
+ * void *vlc_memalign( size_t align, size_t size, void **pp_orig )
+ * *pp_orig is the pointer that has to be freed afterwards.
+ */
+static inline
+void *vlc_memalign (void **pp, size_t align, size_t size)
+{
+#if defined (HAVE_POSIX_MEMALIGN)
+ return posix_memalign (pp, align, size) ? NULL : *pp;
+#elif defined (HAVE_MEMALIGN)
+ return *pp = memalign (align, size);
+#else
+ unsigned char *ptr;
+
+ if (align < 1)
+ return NULL;
+
+ align--;
+ ptr = malloc (size + align);
+ if (ptr == NULL)
+ return NULL;
+
+ *pp = ptr;
+ ptr += align;
+ return (void *)(((uintptr_t)ptr) & ~align);
+#endif
+}
+