gstreamer/examples/pipeline-tester

#!/usr/bin/env python
#
# gst-python
# Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
#
# 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.


# A test more of gst-plugins than of gst-python.


import sys

import pygtk
pygtk.require('2.0')
import gtk
import gtk.gdk
import pango
import gobject

import pygst
pygst.require('0.10')
import gst

import debugslider


data = (('Video capture via V4L',
         'v4lsrc name=source \n'
         '    ! videorate \n'
         '    ! xvimagesink'),
        ('Video capture via V4L, fixed frame rate',
         'v4lsrc name=source autoprobe=false autoprobe-fps=false \n'
         '    ! video/x-raw-yuv,format=(fourcc)I420,framerate=(double)7.5 \n'
         '    ! videorate \n'
         '    ! ffmpegcolorspace \n'
         '    ! xvimagesink'),
        ('Sound capture via ALSA',
         'alsasrc\n'
         '    ! audio/x-raw-int,rate=22050,depth=16,channels=1,width=16,signed=(boolean)TRUE,endianness=1234\n'
         '    ! level message=true\n'
         '    ! fakesink'),
        ('Streaming Ogg/Theora+Vorbis playback, tee to disk',
         'gnomevfssrc location=http://gstreamer.freedesktop.org/media/small/cooldance.ogg \n'
         '    ! tee name=tee \n'
         '    tee. ! oggdemux name=demux \n'
         '    demux. ! queue ! theoradec ! xvimagesink \n'
         '    demux. ! queue ! vorbisdec ! audioconvert ! alsasink \n'
         '    tee. ! queue ! filesink location=cooldance.ogg'),
        ('Video test, YUV format',
         'videotestsrc \n'
         '    ! video/x-raw-yuv,format=(fourcc)I420 \n'
         '    ! xvimagesink'),
        ('Video test, RGB format',
         'videotestsrc \n'
         '    ! video/x-raw-rgb,red_mask=0xff00 \n'
         '    ! ffmpegcolorspace \n'
         '    ! ximagesink'),
        ('Software scaling',
         'videotestsrc \n'
         '    ! video/x-raw-rgb,height=200,width=320 \n'
         '    ! videoscale method=2 \n'
         '    ! ximagesink'),
        ('Reencode Vorbis to mulaw, play via ALSA',
         'filesrc location=cooldance.ogg \n'
         '    ! oggdemux \n'
         '    ! vorbisdec ! audioconvert \n'
         '    ! mulawenc ! mulawdec ! alsasink'),
        ('Capture DV via firewire, transcode into Ogg',
         'dv1394src \n'
         '    ! dvdemux name=demux \n'
         '    ! queue \n'
         '    ! video/x-dv,systemstream=(boolean)false \n'
         '    ! dvdec drop-factor=2 \n'
         '    ! videorate \n'
         '    ! videoscale \n'
         '    ! video/x-raw-yuv,width=360,height=288 \n'
         '    ! videoscale \n'
         '    ! video/x-raw-yuv,width=240,height=192,framerate=10.0,format=(fourcc)YUY2 \n'
         '    ! ffmpegcolorspace \n'
         '    ! theoraenc \n'
         '    ! oggmux name=mux \n'
         '    ! filesink location=dv.ogg \n'
         ' \n'
         '    demux. \n'
         '    ! audio/x-raw-int \n'
         '    ! queue \n'
         '    ! audioconvert \n'
         '    ! vorbisenc \n'
         '    ! mux.'))


def escape(s, chars, escaper='\\'):
    for c in chars:
        s = s.replace(c, '%s%s' % (escaper, c))
    return s


def make_model():
    m = gtk.ListStore(str, str)
    for pair in data:
        i = m.append()
        m.set_value(i, 0, pair[0])
        m.set_value(i, 1, pair[1])
    return m


class Window(gtk.Window):
    def __init__(self):
        gtk.Window.__init__(self, gtk.WINDOW_TOPLEVEL)
        self.playing = False
        self.selected_pipe = None
        self.pipeline = None
        self.prepare_ui()

    def prepare_ui(self):
        self.set_default_size(300,400)
        self.set_title('GStreamer Pipeline Tester')
        self.set_type_hint(gtk.gdk.WINDOW_TYPE_HINT_DIALOG)
        self.connect('delete-event', lambda *x: gtk.main_quit())
        self.set_border_width(18)
        b = gtk.VBox(False, 12)
        b.show()
        self.add(b)
        l = gtk.Label()
        l.set_markup('<big><b>GStreamer Pipeline Tester</b></big>')
        l.show()
        b.pack_start(l, False, False, 6)
        l = gtk.Label('Choose a pipeline below to run.')
        l.show()
        b.pack_start(l, False, False, 0)
        sw = gtk.ScrolledWindow()
        sw.set_policy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
        sw.set_shadow_type(gtk.SHADOW_IN)
        sw.show()
        b.pack_start(sw, True, True, 6)
        tv = gtk.TreeView(make_model())
        tv.set_property('can-default', False)
        r = gtk.CellRendererText()
        r.set_property('xalign', 0.5)
        c = gtk.TreeViewColumn('System', r, text=0)
        tv.append_column(c)
        tv.set_headers_visible(False)
        tv.show()
        sw.add(tv)
        ds = debugslider.DebugSlider()
        ds.show()
        b.pack_start(ds, False, False, 0)
        l = gtk.Label()
        l.set_selectable(True)
        l.show()
        b.pack_start(l, False, False, 0)
        bb = gtk.HButtonBox()
        bb.set_layout(gtk.BUTTONBOX_SPREAD)
        bb.show()
        b.pack_start(bb, False, False, 0)
        bu = gtk.Button(stock=gtk.STOCK_MEDIA_PLAY)
        bu.set_property('can-default', True)
        bu.set_focus_on_click(False)
        bu.show()
        bb.pack_start(bu, True, False, 0)
        bu.set_property('has-default', True)
        self.button = bu

        def on_changed(s):
            m, i = s.get_selected()
            if m:
                self.selected_pipe = m.get_value(i, 1)
                pasteable = escape(self.selected_pipe, '\n)(')
                l.set_markup('<small><tt>%s</tt></small>' % pasteable)
            else:
                self.selected_pipe = None
                l.set_markup('')
        tv.get_selection().connect('changed', on_changed)

        tv.connect('row-activated', lambda *x: self.play_toggled())

        bu.connect('clicked', lambda *x: self.play_toggled())

    def error(self, message, secondary=None):
        m = gtk.MessageDialog(self,
                              gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                              gtk.MESSAGE_ERROR,
                              gtk.BUTTONS_OK,
                              message)
        if secondary:
            m.format_secondary_text(secondary)
        m.run()
        m.destroy()
        self.stop()

    def on_message(self, bus, message):
        t = message.type
        print message
        if t == gst.MESSAGE_STATE_CHANGED:
            pass
        elif t == gst.MESSAGE_ERROR:
            err, debug = message.parse_error()
            self.error("%s" % err, debug)
        elif t == gst.MESSAGE_EOS:
            self.play_toggled()
        else:
            print '%s: %s:' % (message.src.get_path_string(),
                               message.type.value_nicks[1])
            if message.structure:
                print '    %s' % message.structure.to_string()
            else:
                print '    (no structure)'
        return True

    def play(self):
        pipestr = self.selected_pipe
        try:
            self.set_sensitive(False)
            pipeline = gst.parse_launch(pipestr)
            self.set_sensitive(True)
        except gobject.GError, e:
            self.set_sensitive(True)
            self.error('Could not create pipeline', str(e))
            return False
        
        bus = pipeline.get_bus()
        bus.add_signal_watch()
        watch_id = bus.connect('message', self.on_message)
        self.pipeline = pipeline
        self.watch_id = watch_id
        pipeline.set_state(gst.STATE_PLAYING)

    def stop(self):
        bus = self.pipeline.get_bus()
        bus.disconnect(self.watch_id)
        bus.remove_signal_watch()
        self.pipeline.set_state(gst.STATE_NULL)
        self.pipeline = None
        del self.watch_id

    def play_toggled(self):
        if self.playing:
            self.stop()
            self.button.set_label(gtk.STOCK_MEDIA_PLAY)
            self.playing = False
        else:
            self.play()
            self.playing = True
            self.button.set_label(gtk.STOCK_MEDIA_STOP)

if __name__ == '__main__':
    w = Window()
    w.show()
    gtk.main()