# gst-python # Copyright (C) 2005 Fluendo S.L. # Originally from the Flumotion streaming server. # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Library General Public # License as published by the Free Software Foundation; either # version 2 of the License, or (at your option) any later version. # # This library 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 # Library General Public License for more details. # # You should have received a copy of the GNU Library General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. # # Author: Zaheer Merali <zaheermerali at gmail dot com> import gtk from gtk import gdk import gobject # this VUMeter respects IEC standard # BS 6840-18:1996/IEC-268-18 # and is inspired by JACK's meterbridge dpm_meters.c class FVUMeter(gtk.DrawingArea): __gsignals__ = { 'expose-event' : 'override', 'size-allocate': 'override', 'size-request': 'override', 'realize' : 'override' } __gproperties__ = { 'peak' : (gobject.TYPE_FLOAT, 'peak volume level', 'peak volume level in dB', -90.0, 0, -90.0, gobject.PARAM_READWRITE), 'decay' : (gobject.TYPE_FLOAT, 'decay volume level', 'decay volume level in dB', -90.0, 0, -90.0, gobject.PARAM_READWRITE), 'orange-threshold': (gobject.TYPE_FLOAT, 'threshold for orange', 'threshold for orange use in dB', -90.0, 0, -10.0, gobject.PARAM_READWRITE), 'red-threshold': (gobject.TYPE_FLOAT, 'threshold for red', 'threshold for red use in dB', -90.0, 0, -1.0, gobject.PARAM_READWRITE) } green_gc = None orange_gc = None red_gc = None yellow_gc = None topborder = 7 peaklevel = -90.0 decaylevel = -90.0 orange_threshold = -10.0 red_threshold = -1.0 bottomborder = 25 leftborder = 15 rightborder = 65 # Returns the meter deflection percentage given a db value def iec_scale(self, db): pct = 0.0 if db < -70.0: pct = 0.0 elif db < -60.0: pct = (db + 70.0) * 0.25 elif db < -50.0: pct = (db + 60.0) * 0.5 + 2.5 elif db < -40.0: pct = (db + 50.0) * 0.75 + 7.5 elif db < -30.0: pct = (db + 40.0) * 1.5 + 15.0 elif db < -20.0: pct = (db + 30.0) * 2.0 + 30.0 elif db < 0.0: pct = (db + 20.0) * 2.5 + 50.0 else: pct = 100.0 return pct def do_get_property(self, property): if property.name == 'peak': return self.peaklevel elif property.name == 'decay': return self.decaylevel elif property.name == 'orange-threshold': return self.orange_threshold elif property.name == 'red-threshold': return self.red_threshold else: raise AttributeError, 'unknown property %s' % property.name def do_set_property(self, property, value): if property.name == 'peak': self.peaklevel = value elif property.name == 'decay': self.decaylevel = value elif property.name == 'orange-threshold': self.orange_threshold = value elif property.name == 'red-threshold': self.red_threshold = value else: raise AttributeError, 'unknown property %s' % property.name self.queue_draw() def do_size_request(self, requisition): requisition.width = 250 requisition.height = 50 def do_size_allocate(self, allocation): self.allocation = allocation if self.flags() & gtk.REALIZED: self.window.move_resize(*allocation) def do_realize(self): self.set_flags(self.flags() | gtk.REALIZED) self.window = gdk.Window(self.get_parent_window(), width=self.allocation.width, height=self.allocation.height, window_type=gdk.WINDOW_CHILD, wclass=gdk.INPUT_OUTPUT, event_mask=self.get_events() | gdk.EXPOSURE_MASK) colormap = gtk.gdk.colormap_get_system() green = colormap.alloc_color(0, 65535, 0) orange = colormap.alloc_color(65535, 32768, 0) red = colormap.alloc_color(65535, 0, 0) yellow = colormap.alloc_color(65535, 65535, 0) self.green_gc = gdk.GC(self.window, foreground=green) self.orange_gc = gdk.GC(self.window, foreground=orange) self.red_gc = gdk.GC(self.window, foreground=red) self.yellow_gc = gdk.GC(self.window, foreground=yellow) self.window.set_user_data(self) self.style.attach(self.window) self.style.set_background(self.window, gtk.STATE_NORMAL) def do_expose_event(self, event): self.chain(event) x, y, w, h = self.allocation vumeter_width = w - (self.leftborder + self.rightborder) vumeter_height = h - (self.topborder + self.bottomborder) self.window.draw_rectangle(self.style.black_gc, True, self.leftborder, self.topborder, vumeter_width, vumeter_height) # draw peak level peaklevelpct = self.iec_scale(self.peaklevel) peakwidth = int(vumeter_width * (peaklevelpct/100)) draw_gc = self.green_gc if self.peaklevel >= self.orange_threshold: draw_gc = self.orange_gc if self.peaklevel >= self.red_threshold: draw_gc = self.red_gc self.window.draw_rectangle(draw_gc, True, self.leftborder, self.topborder, peakwidth, vumeter_height) # draw yellow decay level if self.decaylevel > -90.0: decaylevelpct = self.iec_scale(self.decaylevel) decaywidth = int(vumeter_width * (decaylevelpct/100)) self.window.draw_line(self.yellow_gc, self.leftborder + decaywidth, self.topborder, self.leftborder + decaywidth, self.topborder + vumeter_height) # draw tick marks # - 90.0 dB self.window.draw_line(self.style.black_gc, self.leftborder, h - self.bottomborder, self.leftborder, h - self.bottomborder + 5) layout = self.create_pango_layout("-90") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder - int(layout_width/2), h - self.bottomborder + 7, layout) # -40.0 dB self.window.draw_line(self.style.black_gc, self.leftborder + int(0.15*vumeter_width), h - self.bottomborder, self.leftborder + int(0.15*vumeter_width), h - self.bottomborder + 5) layout = self.create_pango_layout("-40") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + int(0.15*vumeter_width) - int(layout_width/2), h - self.bottomborder + 7, layout) # -30.0 dB self.window.draw_line(self.style.black_gc, self.leftborder + int(0.30*vumeter_width), h - self.bottomborder, self.leftborder + int(0.30*vumeter_width), h - self.bottomborder + 5) layout = self.create_pango_layout("-30") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + int(0.30*vumeter_width) - int(layout_width/2), h - self.bottomborder + 7, layout) # -20.0 dB self.window.draw_line(self.style.black_gc, self.leftborder + int(0.50*vumeter_width), h - self.bottomborder, self.leftborder + int(0.50*vumeter_width), h - self.bottomborder + 5) layout = self.create_pango_layout("-20") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + int(0.50*vumeter_width) - int(layout_width/2), h - self.bottomborder + 7, layout) # -10.0dB self.window.draw_line(self.style.black_gc, self.leftborder + int(0.75*vumeter_width), h - self.bottomborder, self.leftborder + int(0.75*vumeter_width), h - self.bottomborder + 5) layout = self.create_pango_layout("-10") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + int(0.75*vumeter_width) - int(layout_width/2), h - self.bottomborder + 7, layout) # - 5.0dB self.window.draw_line(self.style.black_gc, self.leftborder + int(0.875*vumeter_width), h - self.bottomborder, self.leftborder + int(0.875*vumeter_width), h - self.bottomborder + 5) layout = self.create_pango_layout("-5") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + int(0.875*vumeter_width) - int(layout_width/2), h - self.bottomborder + 7, layout) # 0.0dB self.window.draw_line(self.style.black_gc, self.leftborder + vumeter_width, h - self.bottomborder, self.leftborder + vumeter_width, h - self.bottomborder + 5) layout = self.create_pango_layout("0") layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + vumeter_width - int(layout_width/2), h - self.bottomborder + 7, layout) # draw the value to the right layout = self.create_pango_layout("%.2fdB" % self.peaklevel) layout_width, layout_height = layout.get_pixel_size() self.window.draw_layout(self.style.black_gc, self.leftborder + vumeter_width + 5, self.topborder + int(vumeter_height/2 - layout_height/2), layout) gobject.type_register(FVUMeter)