mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 12:11:13 +00:00
239 lines
8.6 KiB
Python
239 lines
8.6 KiB
Python
# -*- 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)
|