lavu: check av_clip*() limits

This code cannot use av_assert* due to circular header dependancies
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/common.h

@@ -97,6 +97,9 @@ av_const int av_log2_16bit(unsigned v);
  */
 static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
 {
+#if defined(HAVE_AV_CONFIG_H) && ASSERT_LEVEL >= 2
+    if (amin > amax) abort();
+#endif
     if      (a < amin) return amin;
     else if (a > amax) return amax;
     else               return a;
@@ -111,6 +114,9 @@ static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
  */
 static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
 {
+#if defined(HAVE_AV_CONFIG_H) && ASSERT_LEVEL >= 2
+    if (amin > amax) abort();
+#endif
     if      (a < amin) return amin;
     else if (a > amax) return amax;
     else               return a;
@@ -216,6 +222,9 @@ static av_always_inline int av_sat_dadd32_c(int a, int b)
  */
 static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
 {
+#if defined(HAVE_AV_CONFIG_H) && ASSERT_LEVEL >= 2
+    if (amin > amax) abort();
+#endif
     if      (a < amin) return amin;
     else if (a > amax) return amax;
     else               return a;