libs: utils: avoid macro evaluation when stringify

string_of_va_chroma_format() gets a wrong string format description.
For example, the YUV420_10BPP get a string of 0x00000100 as output.

It's because VA_RT_FORMAT_xxx values are macro definitions. And
STRINGIFY(VA_RT_FORMAT_xxx) will expand to its real value
0x00000XXX.

To avoid the macro evaluation, it is changed to show only the color
format without VA_RT_FORMAT_ prefix.

diff --git a/gst-libs/gst/vaapi/gstvaapiutils.c b/gst-libs/gst/vaapi/gstvaapiutils.c
index 6b60395..7f9b9ca 100644 (file)
--- a/gst-libs/gst/vaapi/gstvaapiutils.c
+++ b/gst-libs/gst/vaapi/gstvaapiutils.c
@@ -34,9 +34,13 @@
 #define DEBUG 1
 #include "gstvaapidebug.h"
 
+/* string case an enum */
 #define STRCASEP(p, x)  STRCASE(G_PASTE(p, x))
 #define STRCASE(x)      case x: return G_STRINGIFY(x)
 
+/* string case a macro */
+#define STRCASEM(p, x)  case G_PASTE(p, x): return G_STRINGIFY(x)
+
 #if VA_CHECK_VERSION (0,40,0)
 static gchar *
 strip_msg (const char *message)
@@ -294,7 +298,7 @@ string_of_va_chroma_format (guint chroma_format)
 {
   switch (chroma_format) {
 #define MAP(value) \
-        STRCASEP(VA_RT_FORMAT_, value)
+        STRCASEM(VA_RT_FORMAT_, value)
       MAP (YUV420);
       MAP (YUV422);
       MAP (YUV444);