Factor out Stream.start()

[srec] / srec.py

diff --git a/srec.py b/srec.py
index 50f311c14d1dd6d2ff4e4fac08a31fb9af03d645..944cc5cccd387587d86466a2389383023c5bf230 100644 (file)
--- a/srec.py
+++ b/srec.py
@@ -4,10 +4,13 @@
 # under the terms of the GNU General Public License as published by the
 # Free Software Foundation, version 3.
 
+from __future__ import annotations
+
 from dataclasses import dataclass
 from datetime import datetime
 import os
 import subprocess
+import sys
 from typing import Any, Callable
 
 import gi
@@ -19,18 +22,26 @@ from gi.repository import GLib  # nopep8 pylint: disable=wrong-import-position
 
 
 @dataclass
-class Recording:
+class Stream:
     process: subprocess.Popen[bytes]
 
+    @staticmethod
+    def start(command: list[str]) -> Stream:
+        # pylint: disable=consider-using-with
+        return Stream(process=subprocess.Popen(command, stdin=subprocess.PIPE))
+
     def stop(self) -> None:
         stdin = self.process.stdin
         assert stdin is not None
-        stdin.write(b'q')
-        stdin.flush()
+        try:
+            stdin.write(b'q')
+            stdin.flush()
+        except BrokenPipeError:
+            print("Stream already stopped?", file=sys.stderr)
         self.process.wait()
 
 
-recording: Recording | None = None
+recording: Stream | None = None
 
 
 def make_filename() -> str:
@@ -79,11 +90,9 @@ def on_start_recording(_: Gtk.Button, stack: Gtk.Stack) -> None:
         return GLib.SOURCE_REMOVE if recording is None else GLib.SOURCE_CONTINUE
     GLib.timeout_add_seconds(1, update_size_display)
 
-    command = (['ffmpeg', '-framerate', '25'] + video_source(stack) +
-               ['-f', 'pulse', '-ac', '2', '-i', 'default', filename])
-    # pylint: disable=consider-using-with
-    recording = Recording(
-        process=subprocess.Popen(command, stdin=subprocess.PIPE))
+    recording = Stream.start(
+        ['ffmpeg', '-framerate', '25'] + video_source(stack) +
+        ['-f', 'pulse', '-ac', '2', '-i', 'default', filename])
     stack.set_visible_child_name("recording")