Merge remote branch 'qatar/master'

* qatar/master:
  swscale: properly inline bits/endianness in yuv2yuvX16inC().
(We didnt pull the bug)  swscale: fix clipping of 9/10bit YUV420P.
  Add av_clip_uintp2() function
(our patch / duplicate)  dfa: fix buffer overflow checks to avoid integer overflows.
(our patch / duplicate)  movenc: always write esds descriptor length using 4 bytes.
(our patch / duplicate)  ffmpeg: use parse_number_and_die() when it makes sense
(No thanks)  ffmpeg: get rid of the 'q' key schizofrenia

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/vp8.c

@@ -1329,9 +1329,7 @@ static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *m
         filter_level += s->lf_delta.mode[mb->mode];
     }
 
-/* Like av_clip for inputs 0 and max, where max is equal to (2^n-1) */
-#define POW2CLIP(x,max) (((x) & ~max) ? (-(x))>>31 & max : (x));
-    filter_level = POW2CLIP(filter_level, 63);
+    filter_level = av_clip_uintp2(filter_level, 6);
 
     interior_limit = filter_level;
     if (s->filter.sharpness) {

libavutil/common.h

@@ -171,6 +171,18 @@ static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
     else                                         return a;
 }
 
+/**
+ * Clip a signed integer to an unsigned power of two range.
+ * @param  a value to clip
+ * @param  p bit position to clip at
+ * @return clipped value
+ */
+static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
+{
+    if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
+    else                   return  a;
+}
+
 /**
  * Clip a float value into the amin-amax range.
  * @param a value to clip
@@ -364,6 +376,9 @@ static av_always_inline av_const int av_popcount_c(uint32_t x)
 #ifndef av_clipl_int32
 #   define av_clipl_int32   av_clipl_int32_c
 #endif
+#ifndef av_clip_uintp2
+#   define av_clip_uintp2   av_clip_uintp2_c
+#endif
 #ifndef av_clipf
 #   define av_clipf         av_clipf_c
 #endif

libswscale/swscale.c

@@ -367,6 +367,20 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
     //FIXME Optimize (just quickly written not optimized..)
     int i;
 
+#define output_pixel(pos, val) \
+    if (big_endian) { \
+        if (output_bits == 16) { \
+            AV_WB16(pos, av_clip_uint16(val >> shift)); \
+        } else { \
+            AV_WB16(pos, av_clip_uintp2(val >> shift, output_bits)); \
+        } \
+    } else { \
+        if (output_bits == 16) { \
+            AV_WL16(pos, av_clip_uint16(val >> shift)); \
+        } else { \
+            AV_WL16(pos, av_clip_uintp2(val >> shift, output_bits)); \
+        } \
+    }
     for (i = 0; i < dstW; i++) {
         int val = 1 << 10;
         int j;
@@ -374,11 +388,7 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
         for (j = 0; j < lumFilterSize; j++)
             val += lumSrc[j][i] * lumFilter[j];
 
-        if (big_endian) {
-            AV_WB16(&dest[i], av_clip_uint16(val >> 11));
-        } else {
-            AV_WL16(&dest[i], av_clip_uint16(val >> 11));
-        }
+        output_pixel(&dest[i], val);
     }
 
     if (uDest) {
@@ -392,13 +402,8 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
                 v += chrSrc[j][i + VOFW] * chrFilter[j];
             }
 
-            if (big_endian) {
-                AV_WB16(&uDest[i], av_clip_uint16(u >> 11));
-                AV_WB16(&vDest[i], av_clip_uint16(v >> 11));
-            } else {
-                AV_WL16(&uDest[i], av_clip_uint16(u >> 11));
-                AV_WL16(&vDest[i], av_clip_uint16(v >> 11));
-            }
+            output_pixel(&uDest[i], u);
+            output_pixel(&vDest[i], v);
         }
     }
 
@@ -410,11 +415,7 @@ static av_always_inline void yuv2yuvX16inC_template(const int16_t *lumFilter, co
             for (j = 0; j < lumFilterSize; j++)
                 val += alpSrc[j][i] * lumFilter[j];
 
-            if (big_endian) {
-                AV_WB16(&aDest[i], av_clip_uint16(val >> 11));
-            } else {
-                AV_WL16(&aDest[i], av_clip_uint16(val >> 11));
-            }
+            output_pixel(&aDest[i], val);
         }
     }
 }