/usr/share/gst-python/0.10/examples/fvumeter.py is in python-gst0.10-dev 0.10.22-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | # -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# 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
# 0 maps to width of 0, full scale maps to total width
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
if peakwidth > 0:
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))
# cheat the geometry by drawing 0% level at pixel 0,
# which is same position as just above 0%
if decaywidth == 0:
decaywidth = 1
self.window.draw_line(self.yellow_gc,
self.leftborder + decaywidth - 1,
self.topborder,
self.leftborder + decaywidth - 1,
self.topborder + vumeter_height - 1)
# draw tick marks
scalers = [
('-90', 0.0),
('-40', 0.15),
('-30', 0.30),
('-20', 0.50),
('-10', 0.75),
( '-5', 0.875),
( '0', 1.0),
]
for level, scale in scalers:
# tick mark, 6 pixels high
# we cheat again here by putting the 0 at the first pixel
self.window.draw_line(self.style.black_gc,
self.leftborder + int(scale * (vumeter_width - 1)),
h - self.bottomborder,
self.leftborder + int(scale * (vumeter_width - 1)),
h - self.bottomborder + 5)
# tick label
layout = self.create_pango_layout(level)
layout_width, layout_height = layout.get_pixel_size()
self.window.draw_layout(self.style.black_gc,
self.leftborder + int(scale * vumeter_width)
- int(layout_width / 2),
h - self.bottomborder + 7, layout)
# draw the peak level 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)
|