fixing get_bits_count at the end

Originally committed as revision 638 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/common.c

@@ -174,6 +174,9 @@ unsigned int get_bits_long(GetBitContext *s, int n)
                 (buf_ptr[-2] << 8) |
                 (buf_ptr[-1]);	    
 #endif
+            val |= bit_buf >> (32 + bit_cnt);
+            bit_buf <<= - bit_cnt;
+            bit_cnt += 32;
         } else {
             buf_ptr -= 4;
             bit_buf = 0;
@@ -185,11 +188,13 @@ unsigned int get_bits_long(GetBitContext *s, int n)
                 bit_buf |= *buf_ptr++ << 8;
             if (buf_ptr < s->buf_end)
                 bit_buf |= *buf_ptr++;
-        }
-        s->buf_ptr = buf_ptr;
+
             val |= bit_buf >> (32 + bit_cnt);
             bit_buf <<= - bit_cnt;
-        bit_cnt += 32;
+            bit_cnt += 8*(buf_ptr - s->buf_ptr);
+            if(bit_cnt<0) bit_cnt=0;
+        }
+        s->buf_ptr = buf_ptr;
     }
     s->bit_buf = bit_buf;
     s->bit_cnt = bit_cnt;