Tee webcam video to two virtual cameras

[srec] / srec.py

diff --git a/srec.py b/srec.py
index 944cc5cccd387587d86466a2389383023c5bf230..962c147045b95ecbf76a0bca5dfca2b66e4cf5be 100644 (file)
--- a/srec.py
+++ b/srec.py
@@ -11,6 +11,7 @@ from datetime import datetime
 import os
 import subprocess
 import sys
 import os
 import subprocess
 import sys

+import time

 from typing import Any, Callable
 
 import gi
 from typing import Any, Callable
 
 import gi


@@ -42,6 +43,7 @@ class Stream:
 
 
 recording: Stream | None = None
 
 
 recording: Stream | None = None

+sharing: Stream | None = None

 
 
 def make_filename() -> str:
 
 
 def make_filename() -> str:


@@ -56,9 +58,18 @@ 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', 'x11grab', '-i', ':0.0+0,0']
 def video_source(stack: Gtk.Stack) -> list[str]:
     if stack.get_child_by_name('not_recording').get_first_child().get_active():
         return ['-f', 'x11grab', '-i', ':0.0+0,0']

+    if is_sharing_enabled(stack):
+        return ['-f', 'v4l2', '-i', '/dev/video9']

     return ['-f', 'v4l2', '-i', '/dev/video0']
 
 
     return ['-f', 'v4l2', '-i', '/dev/video0']
 
 

+def is_sharing_enabled(stack: Gtk.Stack) -> bool:
+    enabled = stack.get_child_by_name('not_recording').get_first_child(
+    ).get_next_sibling().get_next_sibling().get_active()
+    assert isinstance(enabled, bool)
+    return enabled
+
+

 def find_size_display(stack: Gtk.Stack) -> Gtk.Label:
     return stack.get_child_by_name(
         'recording').get_first_child().get_next_sibling()
 def find_size_display(stack: Gtk.Stack) -> Gtk.Label:
     return stack.get_child_by_name(
         'recording').get_first_child().get_next_sibling()


@@ -74,33 +85,55 @@ def summarize_size(n: int) -> str:
     return str(n)
 
 
     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:
 def on_start_recording(_: Gtk.Button, stack: Gtk.Stack) -> None:

-    global recording  # pylint: disable=global-statement
+    global recording, sharing  # pylint: disable=global-statement

     assert recording is None
     assert recording is None

+    assert sharing is None

 
     filename = make_filename()
 
     filename = make_filename()

-    size_display = find_size_display(stack)
+    begin_monitoring_file_size(find_size_display(stack), filename)

 
 

-    def update_size_display() -> Any:
-        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 recording is None else GLib.SOURCE_CONTINUE
-    GLib.timeout_add_seconds(1, update_size_display)
+    stack.set_visible_child_name("recording")
+
+    if is_sharing_enabled(stack):
+        out_opts = [
+            '-f', 'v4l2', '-framerate', '25', '-codec:v', 'rawvideo',
+            '-pix_fmt', 'yuv420p',
+        ]
+        sharing = Stream.start(
+            ['ffmpeg', '-i', '/dev/video0']
+            + out_opts + ['/dev/video8']
+            + out_opts + ['/dev/video9'])
+        time.sleep(3)  # Bad!!  We should not be sleeping in this thread!

 
     recording = Stream.start(
         ['ffmpeg', '-framerate', '25'] + video_source(stack) +
         ['-f', 'pulse', '-ac', '2', '-i', 'default', 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:
 
 
 def on_stop_recording(_: Gtk.Button, stack: Gtk.Stack) -> None:

-    global recording  # pylint: disable=global-statement
+    global recording, sharing  # pylint: disable=global-statement

     assert recording is not None
     recording.stop()
     recording = None
     assert recording is not None
     recording.stop()
     recording = None

+    if sharing is not None:
+        sharing.stop()
+        sharing = None

     stack.set_visible_child_name("not_recording")
 
 
     stack.set_visible_child_name("not_recording")