amr: remove shift out of the AMR_BIT() macro.

MSVC doesn't like the offsetof(..) >> 1 construct, it interprets it as
a non-literal, thus causing use of this in static tables to fail
compilation.

libavcodec/amr.h

@@ -61,7 +61,7 @@ static inline void ff_amr_bit_reorder(uint16_t *out, int size,
            field <<= 1;
            field |= data[bit >> 3] >> (bit & 7) & 1;
         }
-        out[field_offset] = field;
+        out[field_offset >> 1] = field;
     }
 }
 

libavcodec/amrnbdata.h

@@ -71,7 +71,7 @@ typedef struct {
 } AMRNBFrame;
 
 /** The index of a frame parameter */
-#define AMR_BIT(field)                  (offsetof(AMRNBFrame, field) >> 1)
+#define AMR_BIT(field)                  (offsetof(AMRNBFrame, field))
 /** The index of a subframe-specific parameter */
 #define AMR_OF(frame_num, variable)     AMR_BIT(subframe[frame_num].variable)
 

libavcodec/amrwbdata.h

@@ -82,7 +82,7 @@ typedef struct {
 } AMRWBFrame;
 
 /** The index of a frame parameter */
-#define AMR_BIT(field)                  (offsetof(AMRWBFrame, field) >> 1)
+#define AMR_BIT(field)                  (offsetof(AMRWBFrame, field))
 /** The index of a subframe-specific parameter */
 #define AMR_OF(frame_num, variable)     AMR_BIT(subframe[frame_num].variable)