Don't allow previous recording's size to show when starting new recording

[srec] / srec.py

diff --git a/srec.py b/srec.py
index 4abe5817ac2be6826201dbfbddf0aab77c2c8ba4..0828310be4dfc96b2b21cc912462ed5937b31331 100644 (file)
--- a/srec.py
+++ b/srec.py
@@ -4,24 +4,44 @@
 # 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
-from typing import Callable
+import sys
+from typing import Any, Callable
 
 import gi
 gi.require_version("Gtk", "4.0")
-from gi.repository import Gtk  # nopep8 pylint: disable=wrong-import-position
+gi.require_version("GLib", "2.0")
+
+from gi.repository import Gtk   # nopep8 pylint: disable=wrong-import-position
+from gi.repository import GLib  # nopep8 pylint: disable=wrong-import-position
 
 
 @dataclass
-class Recording:
-    filename: str
+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
+        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:
@@ -35,31 +55,57 @@ def make_filename() -> str:
 
 def video_source(stack: Gtk.Stack) -> list[str]:
     if stack.get_child_by_name('not_recording').get_first_child().get_active():
-        return ['-f', 'v4l2', '-i', '/dev/video0']
-    return ['-f', 'x11grab', '-i', ':0.0+0,0']
+        return ['-f', 'x11grab', '-i', ':0.0+0,0']
+    return ['-f', 'v4l2', '-i', '/dev/video0']
+
+
+def find_size_display(stack: Gtk.Stack) -> Gtk.Label:
+    return stack.get_child_by_name(
+        'recording').get_first_child().get_next_sibling()
+
+
+def summarize_size(n: int) -> str:
+    if n > 100_000_000:
+        m = int(n / (1024 * 1024))
+        return f'{m}M'
+    if n > 100_000:
+        k = int(n / 1024)
+        return f'{k}K'
+    return str(n)
+
+
+def begin_monitoring_file_size(size_display: Gtk.Label, filename: str) -> None:
+    def update_size_display() -> Any:
+        done = recording is None
+        if done:
+            size_display.set_label('')
+        else:
+            try:
+                size = summarize_size(os.stat(filename).st_size)
+            except FileNotFoundError:
+                size = '--'
+            size_display.set_label(f'<big>{size}</big>')
+        return GLib.SOURCE_REMOVE if done else GLib.SOURCE_CONTINUE
+    GLib.timeout_add_seconds(1, update_size_display)
 
 
 def on_start_recording(_: Gtk.Button, stack: Gtk.Stack) -> None:
     global recording  # pylint: disable=global-statement
     assert recording is None
+
     filename = make_filename()
-    command = (['ffmpeg', '-framerate', '25'] + video_source(stack) +
-               ['-f', 'pulse', '-ac', '2', '-i', 'default', filename])
-    # pylint: disable=consider-using-with
-    recording = Recording(
-        filename=filename,
-        process=subprocess.Popen(command, stdin=subprocess.PIPE))
+    begin_monitoring_file_size(find_size_display(stack), filename)
+
+    recording = Stream.start(
+        ['ffmpeg', '-framerate', '25'] + video_source(stack) +
+        ['-f', 'pulse', '-ac', '2', '-i', 'default', filename])
     stack.set_visible_child_name("recording")
 
 
 def on_stop_recording(_: Gtk.Button, stack: Gtk.Stack) -> None:
     global recording  # pylint: disable=global-statement
     assert recording is not None
-    stdin = recording.process.stdin
-    assert stdin is not None
-    stdin.write(b'q')
-    stdin.flush()
-    recording.process.wait()
+    recording.stop()
     recording = None
     stack.set_visible_child_name("not_recording")
 
@@ -75,22 +121,34 @@ def make_button(label: str, action: Callable[[
     return button
 
 
+def make_share_control() -> Gtk.CheckButton:
+    can_share = os.path.exists('/sys/module/v4l2loopback')
+    control = Gtk.CheckButton(
+        label='Share Webcam', sensitive=can_share, active=can_share)
+    control.set_margin_start(20)
+    return control
+
+
 def on_activate(app: Gtk.Application) -> None:
     win = Gtk.ApplicationWindow(application=app)
     win.set_title('SRec')
+    win.set_icon_name('srec')
+
     stack = Gtk.Stack()
 
     nr_box = Gtk.Box()
     nr_box.set_orientation(Gtk.Orientation.VERTICAL)
-    webcam = Gtk.CheckButton(label='Webcam', active=True)
-    nr_box.append(webcam)
-    nr_box.append(Gtk.CheckButton(label='Screen', group=webcam))
+    screen = Gtk.CheckButton(label='Screen')
+    nr_box.append(screen)
+    nr_box.append(Gtk.CheckButton(label='Webcam', active=True, group=screen))
+    nr_box.append(make_share_control())
     nr_box.append(make_button("Start Recording", on_start_recording, stack))
     stack.add_named(nr_box, "not_recording")
 
     r_box = Gtk.Box()
     r_box.set_orientation(Gtk.Orientation.VERTICAL)
     r_box.append(make_button("Stop Recording", on_stop_recording, stack))
+    r_box.append(Gtk.Label(use_markup=True, justify=Gtk.Justification.CENTER))
     stack.add_named(r_box, "recording")
 
     win.set_child(stack)