269 lines
9.5 KiB
Python
269 lines
9.5 KiB
Python
# -*- Mode: Python; coding: utf-8; indent-tabs-mode: nil; tab-width: 4 -*-
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### BEGIN LICENSE
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# Copyright (C) 2013 Sean Davis <smd.seandavis@gmail.com>
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 3, as published
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# by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranties of
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# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
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# PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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### END LICENSE
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from locale import gettext as _
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import logging
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logger = logging.getLogger('mugshot')
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from gi.repository import Gtk, GdkX11, GObject, Gst, GstVideo, GdkPixbuf
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import cairo
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import tempfile, os
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from mugshot_lib.CameraDialog import CameraDialog
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class CameraMugshotDialog(CameraDialog):
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__gtype_name__ = "CameraMugshotDialog"
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def finish_initializing(self, builder): # pylint: disable=E1002
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"""Set up the preferences dialog"""
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super(CameraMugshotDialog, self).finish_initializing(builder)
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Gst.init(None)
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# Code for other initialization actions should be added here.
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vbox = builder.get_object('camera_box')
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self.video_window = Gtk.DrawingArea()
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self.draw_handler = self.video_window.connect('draw', self.on_draw)
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self.video_window.connect("realize",self.__on_video_window_realized)
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vbox.pack_start(self.video_window, True, True, 0)
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self.video_window.show()
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self.camerabin = Gst.ElementFactory.make("camerabin", "camera-source")
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bus = self.camerabin.get_bus()
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bus.add_signal_watch()
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bus.enable_sync_message_emission()
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bus.connect("message", self._on_message)
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bus.connect("sync-message::element", self._on_sync_message)
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self.realized = False
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self.record_button = builder.get_object('camera_record')
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self.apply_button = builder.get_object('camera_apply')
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self.show_all()
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self.filename = None
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def on_draw(self, widget, ctx):
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alloc = widget.get_allocation()
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height = alloc.height
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width = alloc.width
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font_size = 20
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ctx.set_source_rgb(255,255,255)
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ctx.select_font_face("Sans", cairo.FONT_SLANT_NORMAL,
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cairo.FONT_WEIGHT_NORMAL)
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ctx.set_font_size(20)
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ctx.move_to(10,(height-font_size)/2)
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ctx.show_text(_("Please wait while your"))
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ctx.move_to(10,(height-font_size)/2+20)
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ctx.show_text(_("camera is initialized."))
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widget.disconnect(self.draw_handler)
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self.draw_handler = widget.connect('draw', self.on_blank)
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def on_blank(self, widget, ctx):
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ctx.set_source_rgb(0,0,0)
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ctx.paint()
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def play(self):
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"""play - Start the camera streaming and display the output. It is
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necessary to start the camera playing before using most other functions.
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This function has no arguments
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"""
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if not self.realized:
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self._set_video_window_id()
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if not self.realized:
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print _("Cannot display web cam output. Ignoring play command")
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else:
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self.camerabin.set_state(Gst.State.PLAYING)
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def pause(self):
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"""pause - Pause the camera output. It will cause the image to
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"freeze". Use play() to start the camera playng again. Note that
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calling pause before play may cause errors on certain camera.
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This function has no arguments
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"""
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self.camerabin.set_state(Gst.State.PAUSED)
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def take_picture(self, filename):
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"""take_picture - grab a frame from the web cam and save it to
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~/Pictures/datestamp.png, where datestamp is the current datestamp.
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It's possible to add a prefix to the datestamp by setting the
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filename_prefix property.
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If play is not called before take_picture,
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an error may occur. If take_picture is called immediately after play,
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the camera may not be fully initialized, and an error may occur.
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Connect to the signal "image-captured" to be alerted when the picture
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is saved.
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This function has no arguments
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returns - a string of the filename used to save the image
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"""
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self.camerabin.set_property("location", filename)
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self.camerabin.emit("start-capture")
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#self.pause()
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return filename
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def stop(self):
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"""stop - Stop the camera streaming and display the output.
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This function has no arguments
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"""
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self.camerabin.set_state(Gst.State.NULL)
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def _on_message(self, bus, message):
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""" _on_message - internal signal handler for bus messages.
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May be useful to extend in a base class to handle messages
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produced from custom behaviors.
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arguments -
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bus: the bus from which the message was sent, typically self.bux
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message: the message sent
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"""
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if message is None:
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return
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t = message.type
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if t == Gst.MessageType.ASYNC_DONE:
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self.record_button.set_sensitive(True)
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if t == Gst.MessageType.ELEMENT:
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if message.get_structure().get_name() == "image-captured":
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#work around to keep the camera working after lots
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#of pictures are taken
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self.camerabin.set_state(Gst.Sate.NULL)
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self.camerabin.set_state(Gst.State.PLAYING)
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self.emit("image-captured", self.filename)
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elif message.get_structure().get_name() == "image-done":
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self.apply_button.set_sensitive(True)
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self.record_button.set_sensitive(True)
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self.pause()
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if t == Gst.MessageType.EOS:
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self.camerabin.set_state(Gst.State.NULL)
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elif t == Gst.MessageType.ERROR:
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err, debug = message.parse_error()
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print "Error: %s" % err, debug
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def _on_sync_message(self, bus, message):
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""" _on_sync_message - internal signal handler for bus messages.
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May be useful to extend in a base class to handle messages
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produced from custom behaviors.
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arguments -
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bus: the bus from which the message was sent, typically self.bux
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message: the message sent
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"""
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if message.get_structure() is None:
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return
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message_name = message.get_structure().get_name()
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if message_name == "prepare-window-handle":
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imagesink = message.src
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imagesink.set_property("force-aspect-ratio", True)
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imagesink.set_window_handle(self.video_window.get_window().get_xid())
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def __on_video_window_realized(self, widget, data=None):
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"""__on_video_window_realized - internal signal handler, used
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to set up the xid for the drawing area in thread safe manner.
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Do not call directly.
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"""
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self._set_video_window_id()
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def _set_video_window_id(self):
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if not self.realized and self.video_window.get_window() is not None:
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x = self.video_window.get_window().get_xid()
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self.realized = True
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def on_camera_record_clicked(self, widget):
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if self.filename: os.remove(self.filename)
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if self.apply_button.get_sensitive():
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# Retry mode
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self.record_button.set_label(Gtk.STOCK_MEDIA_RECORD)
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self.apply_button.set_sensitive(False)
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self.play()
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else:
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tmpfile = tempfile.NamedTemporaryFile(delete=False)
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tmpfile.close()
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self.filename = tmpfile.name
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self.take_picture(self.filename)
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self.record_button.set_label(_("Retry"))
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self.record_button.set_sensitive(False)
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#self.apply_button.set_sensitive(True)
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def on_camera_apply_clicked(self, widget):
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self.center_crop(self.filename)
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self.emit( "apply", self.filename )
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self.hide()
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def on_camera_cancel_clicked(self, widget):
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self.hide()
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def on_camera_mugshot_dialog_destroy(self, widget, data=None):
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#clean up the camera before exiting
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self.camerabin.set_state(Gst.State.NULL)
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def on_camera_mugshot_dialog_hide(self, widget, data=None):
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self.pause()
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def on_camera_mugshot_dialog_show(self, widget, data=None):
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self.record_button.set_label(Gtk.STOCK_MEDIA_RECORD)
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self.apply_button.set_sensitive(False)
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self.show_all()
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self.play()
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def center_crop(self, filename):
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pixbuf = GdkPixbuf.Pixbuf.new_from_file(filename)
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height = pixbuf.get_height()
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width = pixbuf.get_width()
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start_x = 0
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start_y = 0
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if width > height:
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start_x = (width-height)/2
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width = height
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else:
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start_y = (height-width)/2
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height = width
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new_pixbuf = pixbuf.new_subpixbuf(start_x, start_y, width, height)
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new_pixbuf.savev(filename, "png", [], [])
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def on_camera_mugshot_dialog_delete_event(self, widget, data=None):
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self.hide()
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return True
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__gsignals__ = {'image-captured' : (GObject.SIGNAL_RUN_LAST, GObject.TYPE_NONE,
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(GObject.TYPE_PYOBJECT,)),
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'apply' : (GObject.SIGNAL_RUN_LAST, GObject.TYPE_NONE, (GObject.TYPE_STRING,))
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}
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