Use a constant for default number of threads

picard/acoustid/__init__.py

@@ -36,7 +36,10 @@ from PyQt5 import QtCore
 from picard import log
 from picard.acoustid.json_helpers import parse_recording
 from picard.config import get_config
-from picard.const import FPCALC_NAMES
+from picard.const import (
+    DEFAULT_FPCALC_THREADS,
+    FPCALC_NAMES,
+)
 from picard.const.sys import IS_WIN
 from picard.file import File
 from picard.util import (
@@ -84,7 +87,7 @@ class AcoustIDClient(QtCore.QObject):
 
     def get_max_processes(self):
         config = get_config()
-        return config.setting['fpcalc_threads'] or 2
+        return config.setting['fpcalc_threads'] or DEFAULT_FPCALC_THREADS
 
     def _on_lookup_finished(self, task, document, http, error):
         doc = {}

picard/const/__init__.py

@@ -56,6 +56,7 @@ ACOUSTID_KEY = 'v8pQ6oyB'
 ACOUSTID_HOST = 'api.acoustid.org'
 ACOUSTID_PORT = 443
 FPCALC_NAMES = ['fpcalc', 'pyfpcalc']
+DEFAULT_FPCALC_THREADS = 2
 
 # MB OAuth client credentials
 MUSICBRAINZ_OAUTH_CLIENT_ID = 'ACa9wsDX19cLp-AeEP-vVw'

picard/ui/options/fingerprinting.py

@@ -39,6 +39,7 @@ from picard.config import (
     TextOption,
     get_config,
 )
+from picard.const import DEFAULT_FPCALC_THREADS
 from picard.util import webbrowser2
 
 from picard.ui.options import (
@@ -71,7 +72,7 @@ class FingerprintingOptionsPage(OptionsPage):
         TextOption("setting", "fingerprinting_system", "acoustid"),
         TextOption("setting", "acoustid_fpcalc", ""),
         TextOption("setting", "acoustid_apikey", ""),
-        IntOption("setting", "fpcalc_threads", 2),
+        IntOption("setting", "fpcalc_threads", DEFAULT_FPCALC_THREADS),
     ]
 
     def __init__(self, parent=None):