cast filebytes to int64

NPY_PROMOTION_STATE=weak_and_warn reports that several variables changed from int64 to uint8. Casting to int64 addresses the issue.

wfdb/io/annotation.py

@@ -2134,6 +2134,7 @@ def proc_ann_bytes(filebytes, sampto):
     """
     # Base annotation fields
     sample, label_store, subtype, chan, num, aux_note = [], [], [], [], [], []
+    filebytes = filebytes.astype(np.int64)
 
     # Indexing Variables
 
@@ -2216,16 +2217,17 @@ def proc_core_fields(filebytes, bpi):
 
     """
     sample_diff = 0
+    filebytes = filebytes.astype(np.int64)
 
     # The current byte pair will contain either the actual d_sample + annotation store value,
     # or 0 + SKIP.
     while filebytes[bpi, 1] >> 2 == 59:
         # 4 bytes storing dt
         skip_diff = (
-            (int(filebytes[bpi + 1, 0]) << 16)
-            + (int(filebytes[bpi + 1, 1]) << 24)
-            + (int(filebytes[bpi + 2, 0]) << 0)
-            + (int(filebytes[bpi + 2, 1]) << 8)
+            (filebytes[bpi + 1, 0] << 16)
+            + (filebytes[bpi + 1, 1] << 24)
+            + (filebytes[bpi + 2, 0] << 0)
+            + (filebytes[bpi + 2, 1] << 8)
         )
 
         # Data type is long integer (stored in two's complement). Range -2**31 to 2**31 - 1
@@ -2237,7 +2239,7 @@ def proc_core_fields(filebytes, bpi):
 
     # Not a skip - it is the actual sample number + annotation type store value
     label_store = filebytes[bpi, 1] >> 2
-    sample_diff += int(filebytes[bpi, 0] + 256 * (filebytes[bpi, 1] & 3))
+    sample_diff += np.int64(filebytes[bpi, 0]) + 256 * np.int64(filebytes[bpi, 1] & 3)
     bpi = bpi + 1
 
     return sample_diff, label_store, bpi