116 lines
4.2 KiB
Python
116 lines
4.2 KiB
Python
"""Cattura dello schermo per ambilight su Wayland/KDE (ScreenCast portal + PipeWire).
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Restituisce i colori medi di N zone lungo un bordo dello schermo.
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Nessuna dipendenza da X11: usa xdg-desktop-portal (consenso una volta sola,
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token persistente) e GStreamer con pipewiresrc.
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"""
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import os
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CACHE_DIR = os.path.expanduser("~/.cache/ambilight")
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PORTAL = "org.freedesktop.portal.Desktop"
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PPATH = "/org/freedesktop/portal/desktop"
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def screencast_stream(cache_dir=CACHE_DIR):
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"""Negozia la condivisione del monitor; ritorna (node_id, width, height)."""
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import dbus
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from dbus.mainloop.glib import DBusGMainLoop
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from gi.repository import GLib
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DBusGMainLoop(set_as_default=True)
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bus = dbus.SessionBus()
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sc = dbus.Interface(bus.get_object(PORTAL, PPATH), "org.freedesktop.portal.ScreenCast")
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sender = bus.get_unique_name()[1:].replace(".", "_")
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counter = [0]
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def request(fn, *args, **opts):
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counter[0] += 1
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token = f"ambi{os.getpid()}{counter[0]}"
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path = f"{PPATH}/request/{sender}/{token}"
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iface = dbus.Interface(bus.get_object(PORTAL, path, introspect=False),
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"org.freedesktop.portal.Request")
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box = {}
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loop = GLib.MainLoop()
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def on_response(code, results):
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box["code"], box["results"] = code, results
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loop.quit()
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iface.connect_to_signal("Response", on_response)
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fn(*args, dbus.Dictionary({"handle_token": token, **opts}, signature="sv"))
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GLib.timeout_add_seconds(180, lambda: (loop.quit(), False)[1])
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loop.run()
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if box.get("code") != 0:
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raise RuntimeError("condivisione schermo annullata o rifiutata")
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return box["results"]
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res = request(sc.CreateSession, session_handle_token="ambilight")
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session = str(res["session_handle"])
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token_file = os.path.join(cache_dir, "restore_token")
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opts = {}
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if os.path.exists(token_file):
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tok = open(token_file).read().strip()
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if tok:
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opts["restore_token"] = tok
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request(sc.SelectSources, session, types=dbus.UInt32(1), multiple=False,
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cursor_mode=dbus.UInt32(1), persist_mode=dbus.UInt32(2), **opts)
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res = request(sc.Start, session, "")
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node = int(res["streams"][0][0])
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size = [int(v) for v in res["streams"][0][1].get("size", [0, 0])]
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if "restore_token" in res:
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os.makedirs(cache_dir, exist_ok=True)
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with open(token_file, "w") as f:
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f.write(str(res["restore_token"]))
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return node, size[0], size[1]
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class Capture:
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"""Pipeline GStreamer ridotta a (led*sub) x gh pixel RGB, pronta per il calcolo zone."""
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def __init__(self, node, leds, sub=4, rows=72, fps=60):
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import gi
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gi.require_version("Gst", "1.0")
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gi.require_version("GstApp", "1.0")
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from gi.repository import Gst, GstApp # noqa: F401 (registra il tipo AppSink)
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Gst.init(None)
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self.gw = leds * sub
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self.gh = rows
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desc = (f"pipewiresrc path={node} do-timestamp=true ! "
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f"videoconvert ! videoscale ! videorate ! "
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f"video/x-raw,format=RGB,width={self.gw},height={self.gh},"
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f"framerate={int(fps)}/1 ! "
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f"appsink name=sink emit-signals=false max-buffers=2 drop=true sync=false")
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self.pipe = Gst.parse_launch(desc)
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self.sink = self.pipe.get_by_name("sink")
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def start(self):
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from gi.repository import Gst
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self.pipe.set_state(Gst.State.PLAYING)
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def stop(self):
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from gi.repository import Gst
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self.pipe.set_state(Gst.State.NULL)
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def frame(self, timeout_ms=200):
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"""Ritorna un array numpy (gh, gw, 3) uint8, oppure None."""
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import numpy as np
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from gi.repository import Gst
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sample = self.sink.try_pull_sample(timeout_ms * Gst.MSECOND)
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if sample is None:
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return None
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buf = sample.get_buffer()
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ok, info = buf.map(Gst.MapFlags.READ)
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if not ok:
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return None
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try:
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need = self.gw * self.gh * 3
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data = bytes(info.data)[:need]
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finally:
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buf.unmap(info)
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if len(data) < need:
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return None
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return np.frombuffer(data, dtype=np.uint8).reshape(self.gh, self.gw, 3)
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