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# This file is part of Gajim.
#
# Gajim is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published
# by the Free Software Foundation; version 3 only.
#
# Gajim is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Gajim. If not, see <http://www.gnu.org/licenses/>.
from typing import Optional
import logging
from gi.repository import GLib
from gi.repository import Gtk
from gajim.common import app
from gajim.common.i18n import _
from .builder import get_builder
from .gstreamer import create_gtk_widget
try:
from gi.repository import Gst # pylint: disable=ungrouped-imports
except Exception:
pass
log = logging.getLogger('gajim.gui.preview')
class VideoPreview:
def __init__(self) -> None:
self._ui = get_builder('video_preview.ui')
self._active = False
self._av_pipeline: Optional[Gst.Pipeline] = None
self._av_src: Optional[Gst.Bin] = None
self._av_sink: Optional[Gst.Element] = None
self._av_widget: Optional[Gtk.Widget] = None
@property
def widget(self) -> Gtk.Box:
return self._ui.video_preview_box
@property
def is_active(self) -> bool:
return self._active
def toggle_preview(self, value: bool) -> None:
self._active = value
if value:
return self._enable_preview()
return self._disable_preview()
def _enable_preview(self) -> None:
src_name = app.settings.get('video_input_device')
try:
self._av_src = Gst.parse_bin_from_description(src_name, True)
except GLib.Error as error:
log.error(error)
log.error('Failed to parse "%s" as Gstreamer element', src_name)
self._set_error_text()
return
gtk_widget = create_gtk_widget()
if gtk_widget is None:
log.error('Failed to obtain a working Gstreamer GTK+ sink, '
'video support will be disabled')
self._set_error_text()
return
sink, widget, name = gtk_widget
self._set_sink_text(name)
if self._av_pipeline is None:
self._av_pipeline = Gst.Pipeline.new('preferences-pipeline')
else:
self._av_pipeline.set_state(Gst.State.NULL)
self._av_pipeline.add(sink)
self._av_sink = sink
if self._av_widget is not None:
self._ui.video_preview_box.remove(self._av_widget)
self._ui.video_preview_placeholder.set_visible(False)
self._ui.video_preview_box.pack_end(widget, True, True, 0)
self._av_widget = widget
assert self._av_src is not None
self._av_pipeline.add(self._av_src)
self._av_src.link(self._av_sink)
self._av_pipeline.set_state(Gst.State.PLAYING)
def _disable_preview(self) -> None:
if self._av_pipeline is not None:
self._av_pipeline.set_state(Gst.State.NULL)
if self._av_src is not None:
self._av_pipeline.remove(self._av_src)
if self._av_sink is not None:
self._av_pipeline.remove(self._av_sink)
self._av_src = None
self._av_sink = None
if self._av_widget is not None:
self._ui.video_preview_box.remove(self._av_widget)
self._ui.video_preview_placeholder.set_visible(True)
self._av_widget = None
self._av_pipeline = None
def _set_sink_text(self, sink_name: str) -> None:
text = ''
if sink_name == 'gtkglsink':
text = _('<span color="green" font-weight="bold">'
'OpenGL</span> accelerated')
elif sink_name == 'gtksink':
text = _('<span color="yellow" font-weight="bold">'
'Not accelerated</span>')
self._ui.video_source_label.set_markup(text)
def _set_error_text(self) -> None:
self._ui.video_source_label.set_text(
_('Something went wrong. Video feature disabled.'))
def refresh(self) -> None:
self.toggle_preview(False)
self.toggle_preview(True)
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