printing error messages if something is wrong instead of just return NULL;

Originally committed as revision 4530 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

diff --git a/postproc/swscale.c b/postproc/swscale.c
index a1bccd3..c5a5b0d 100644 (file)
--- a/postproc/swscale.c
+++ b/postproc/swscale.c
@@ -1127,11 +1127,24 @@ SwsContext *getSwsContext(int srcW, int srcH, int srcFormat, int dstW, int dstH,
        if(srcFormat==IMGFMT_Y8)   srcFormat=IMGFMT_Y800;
        if(dstFormat==IMGFMT_Y8)   dstFormat=IMGFMT_Y800;
 
-       if(!isSupportedIn(srcFormat)) return NULL;
-       if(!isSupportedOut(dstFormat)) return NULL;
+       if(!isSupportedIn(srcFormat)) 
+       {
+               fprintf(stderr, "swScaler: %s is not supported as input format\n", vo_format_name(srcFormat));
+               return NULL;
+       }
+       if(!isSupportedOut(dstFormat))
+       {
+               fprintf(stderr, "swScaler: %s is not supported as output format\n", vo_format_name(dstFormat));
+               return NULL;
+       }
 
        /* sanity check */
-       if(srcW<4 || srcH<1 || dstW<8 || dstH<1) return NULL; //FIXME check if these are enough and try to lowwer them after fixing the relevant parts of the code
+       if(srcW<4 || srcH<1 || dstW<8 || dstH<1) //FIXME check if these are enough and try to lowwer them after fixing the relevant parts of the code
+       {
+               fprintf(stderr, "swScaler: %dx%d -> %dx%d is invalid scaling dimension\n", 
+                       srcW, srcH, dstW, dstH);
+               return NULL;
+       }
 
        if(!dstFilter) dstFilter= &dummyFilter;
        if(!srcFilter) srcFilter= &dummyFilter;