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examples/vumeter.py: New file, a VU meter application that reads from alsasrc.
Original commit message from CVS: 2005-07-13 Andy Wingo <wingo@pobox.com> * examples/vumeter.py: New file, a VU meter application that reads from alsasrc. * examples/fvumeter.py: New file, imported from Flumotion and relicensed under the LGPL. Implements a simple VU meter widget.
This commit is contained in:
Andy Wingo
parent
19dd2cc030
commit
6074356cec
4 changed files with 400 additions and 1 deletions
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@ -1,3 +1,11 @@
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2005-07-13 Andy Wingo <wingo@pobox.com>
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* examples/vumeter.py: New file, a VU meter application that reads
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from alsasrc.
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* examples/fvumeter.py: New file, imported from Flumotion and
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relicensed under the LGPL. Implements a simple VU meter widget.
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2005-07-13 Edward Hervey <edward@fluendo.com>
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* gst/gstbus.override: (bus_handler) (bus_sync_handler):
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@ -9,6 +9,8 @@ examples_DATA = \
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vorbisplay.py \
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gstfile.py \
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audioconcat.py \
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pipeline-tester
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pipeline-tester \
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vumeter.py \
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fvumeter.py
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EXTRA_DIST = $(examples_DATA)
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286
examples/fvumeter.py
Normal file
286
examples/fvumeter.py
Normal file
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@ -0,0 +1,286 @@
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# gst-python
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# Copyright (C) 2005 Fluendo S.L.
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# Originally from the Flumotion streaming server.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import gtk
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from gtk import gdk
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import gobject
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# this VUMeter respects IEC standard
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# BS 6840-18:1996/IEC-268-18
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# and is inspired by JACK's meterbridge dpm_meters.c
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class FVUMeter(gtk.DrawingArea):
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__gsignals__ = { 'expose-event' : 'override',
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'size-allocate': 'override',
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'size-request': 'override',
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'realize' : 'override'
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}
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__gproperties__ = {
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'peak' : (gobject.TYPE_FLOAT,
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'peak volume level',
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'peak volume level in dB',
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-90.0,
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0,
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-90.0,
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gobject.PARAM_READWRITE),
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'decay' : (gobject.TYPE_FLOAT,
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'decay volume level',
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'decay volume level in dB',
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-90.0,
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0,
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-90.0,
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gobject.PARAM_READWRITE),
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'orange-threshold': (gobject.TYPE_FLOAT,
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'threshold for orange',
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'threshold for orange use in dB',
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-90.0,
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0,
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-10.0,
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gobject.PARAM_READWRITE),
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'red-threshold': (gobject.TYPE_FLOAT,
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'threshold for red',
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'threshold for red use in dB',
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-90.0,
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0,
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-1.0,
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gobject.PARAM_READWRITE)
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}
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green_gc = None
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orange_gc = None
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red_gc = None
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yellow_gc = None
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topborder = 7
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peaklevel = -90.0
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decaylevel = -90.0
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orange_threshold = -10.0
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red_threshold = -1.0
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bottomborder = 25
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leftborder = 15
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rightborder = 65
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# Returns the meter deflection percentage given a db value
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def iec_scale(self, db):
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pct = 0.0
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if db < -70.0:
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pct = 0.0
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elif db < -60.0:
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pct = (db + 70.0) * 0.25
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elif db < -50.0:
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pct = (db + 60.0) * 0.5 + 2.5
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elif db < -40.0:
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pct = (db + 50.0) * 0.75 + 7.5
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elif db < -30.0:
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pct = (db + 40.0) * 1.5 + 15.0
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elif db < -20.0:
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pct = (db + 30.0) * 2.0 + 30.0
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elif db < 0.0:
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pct = (db + 20.0) * 2.5 + 50.0
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else:
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pct = 100.0
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return pct
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def do_get_property(self, property):
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if property.name == 'peak':
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return self.peaklevel
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elif property.name == 'decay':
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return self.decaylevel
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elif property.name == 'orange-threshold':
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return self.orange_threshold
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elif property.name == 'red-threshold':
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return self.red_threshold
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else:
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raise AttributeError, 'unknown property %s' % property.name
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def do_set_property(self, property, value):
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if property.name == 'peak':
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self.peaklevel = value
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elif property.name == 'decay':
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self.decaylevel = value
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elif property.name == 'orange-threshold':
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self.orange_threshold = value
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elif property.name == 'red-threshold':
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self.red_threshold = value
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else:
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raise AttributeError, 'unknown property %s' % property.name
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self.queue_draw()
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def do_size_request(self, requisition):
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requisition.width = 250
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requisition.height = 50
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def do_size_allocate(self, allocation):
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self.allocation = allocation
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if self.flags() & gtk.REALIZED:
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self.window.move_resize(*allocation)
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def do_realize(self):
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self.set_flags(self.flags() | gtk.REALIZED)
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self.window = gdk.Window(self.get_parent_window(),
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width=self.allocation.width,
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height=self.allocation.height,
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window_type=gdk.WINDOW_CHILD,
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wclass=gdk.INPUT_OUTPUT,
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event_mask=self.get_events() | gdk.EXPOSURE_MASK)
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colormap = gtk.gdk.colormap_get_system()
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green = colormap.alloc_color(0, 65535, 0)
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orange = colormap.alloc_color(65535, 32768, 0)
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red = colormap.alloc_color(65535, 0, 0)
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yellow = colormap.alloc_color(65535, 65535, 0)
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self.green_gc = gdk.GC(self.window, foreground=green)
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self.orange_gc = gdk.GC(self.window, foreground=orange)
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self.red_gc = gdk.GC(self.window, foreground=red)
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self.yellow_gc = gdk.GC(self.window, foreground=yellow)
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self.window.set_user_data(self)
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self.style.attach(self.window)
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self.style.set_background(self.window, gtk.STATE_NORMAL)
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def do_expose_event(self, event):
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self.chain(event)
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x, y, w, h = self.allocation
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vumeter_width = w - (self.leftborder + self.rightborder)
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vumeter_height = h - (self.topborder + self.bottomborder)
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self.window.draw_rectangle(self.style.black_gc, True,
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self.leftborder, self.topborder,
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vumeter_width,
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vumeter_height)
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# draw peak level
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peaklevelpct = self.iec_scale(self.peaklevel)
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peakwidth = int(vumeter_width * (peaklevelpct/100))
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draw_gc = self.green_gc
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if self.peaklevel >= self.orange_threshold:
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draw_gc = self.orange_gc
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if self.peaklevel >= self.red_threshold:
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draw_gc = self.red_gc
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self.window.draw_rectangle(draw_gc, True,
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self.leftborder, self.topborder,
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peakwidth, vumeter_height)
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# draw yellow decay level
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if self.decaylevel > -90.0:
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decaylevelpct = self.iec_scale(self.decaylevel)
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decaywidth = int(vumeter_width * (decaylevelpct/100))
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self.window.draw_line(self.yellow_gc,
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self.leftborder + decaywidth,
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self.topborder,
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self.leftborder + decaywidth,
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self.topborder + vumeter_height)
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# draw tick marks
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# - 90.0 dB
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self.window.draw_line(self.style.black_gc, self.leftborder,
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h - self.bottomborder, self.leftborder,
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("-90")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# -40.0 dB
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self.window.draw_line(self.style.black_gc,
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self.leftborder + int(0.15*vumeter_width),
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h - self.bottomborder,
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self.leftborder + int(0.15*vumeter_width),
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("-40")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + int(0.15*vumeter_width) - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# -30.0 dB
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self.window.draw_line(self.style.black_gc,
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self.leftborder + int(0.30*vumeter_width),
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h - self.bottomborder,
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self.leftborder + int(0.30*vumeter_width),
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("-30")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + int(0.30*vumeter_width) - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# -20.0 dB
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self.window.draw_line(self.style.black_gc,
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self.leftborder + int(0.50*vumeter_width),
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h - self.bottomborder,
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self.leftborder + int(0.50*vumeter_width),
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("-20")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + int(0.50*vumeter_width) - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# -10.0dB
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self.window.draw_line(self.style.black_gc,
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self.leftborder + int(0.75*vumeter_width),
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h - self.bottomborder,
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self.leftborder + int(0.75*vumeter_width),
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("-10")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + int(0.75*vumeter_width) - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# - 5.0dB
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self.window.draw_line(self.style.black_gc,
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self.leftborder + int(0.875*vumeter_width),
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h - self.bottomborder,
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self.leftborder + int(0.875*vumeter_width),
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("-5")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + int(0.875*vumeter_width) - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# 0.0dB
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self.window.draw_line(self.style.black_gc,
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self.leftborder + vumeter_width,
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h - self.bottomborder,
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self.leftborder + vumeter_width,
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h - self.bottomborder + 5)
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layout = self.create_pango_layout("0")
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + vumeter_width - int(layout_width/2),
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h - self.bottomborder + 7, layout)
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# draw the value to the right
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layout = self.create_pango_layout("%.2fdB" % self.peaklevel)
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layout_width, layout_height = layout.get_pixel_size()
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self.window.draw_layout(self.style.black_gc,
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self.leftborder + vumeter_width + 5,
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self.topborder + int(vumeter_height/2 - layout_height/2),
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layout)
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gobject.type_register(FVUMeter)
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103
examples/vumeter.py
Executable file
103
examples/vumeter.py
Executable file
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@ -0,0 +1,103 @@
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#!/usr/bin/env python
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#
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# gst-python
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# Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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# A test more of gst-plugins than of gst-python.
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import pygtk
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pygtk.require('2.0')
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import gtk
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import gobject
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import pygst
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pygst.require('0.9')
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import gst
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import fvumeter
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def clamp(x, min, max):
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if x < min:
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return min
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elif x > max:
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return max
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return x
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class Window(gtk.Dialog):
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def __init__(self):
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gtk.Dialog.__init__(self, 'Volume Level')
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self.prepare_ui()
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def prepare_ui(self):
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self.set_default_size(200,60)
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self.set_title('Volume Level')
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self.connect('delete-event', lambda *x: gtk.main_quit())
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self.vu = fvumeter.FVUMeter()
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self.vu.show()
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self.vbox.pack_start(self.vu)
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def error(self, message, secondary=None):
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m = gtk.MessageDialog(self,
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gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
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gtk.MESSAGE_ERROR,
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gtk.BUTTONS_OK,
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message)
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if secondary:
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m.format_secondary_text(secondary)
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m.run()
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def on_message(self, bus, message):
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t = message.type
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if t == gst.MESSAGE_STATE_CHANGED:
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pass
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if (t == gst.MESSAGE_APPLICATION and
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message.structure.get_name() == 'level'):
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s = message.structure
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self.vu.set_property('peak', clamp(s['peak'][0], -90.0, 0.0))
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self.vu.set_property('decay', clamp(s['decay'][0], -90.0, 0.0))
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else:
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print '%s: %s:' % (message.src.get_path_string(),
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message.type.value_nicks[1])
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print ' %s' % message.structure.to_string()
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return True
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def run(self):
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try:
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self.set_sensitive(False)
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s = 'alsasrc ! level signal=true ! fakesink'
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pipeline = gst.parse_launch(s)
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self.set_sensitive(True)
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watch_id = pipeline.get_bus().add_watch(self.on_message)
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if pipeline.set_state(gst.STATE_PLAYING) == gst.STATE_SUCCESS:
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gtk.Dialog.run(self)
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else:
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self.error('Could not set state')
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pipeline.set_state(gst.STATE_NULL)
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gobject.source_remove(watch_id)
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except gobject.GError, e:
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self.set_sensitive(True)
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self.error('Could not create pipeline', e.__str__)
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if __name__ == '__main__':
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w = Window()
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w.show()
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w.run()
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