Fix a small typo in gst-launch-ext.

Original commit message from CVS:
Fix a small typo in gst-launch-ext.
Add gst-visualise, together with a manpage.

tools/Makefile.am

-bin_SCRIPTS = gst-launch-ext
+bin_SCRIPTS = gst-launch-ext gst-visualise
 
-man_MANS = gst-launch-ext.1
+man_MANS = gst-launch-ext.1 gst-visualise.1
 
 EXTRA_DIST = $(bin_SCRIPTS) $(man_MANS)

tools/gst-launch-ext.1

@@ -2,7 +2,7 @@
 .SH "NAME"
 gst\-launch\-ext \- Run a predefined GStreamer pipeline
 .SH "SYNOPSIS"
-\fBgst\-launch\-ext\fR \fI[OPTION...]\fR PIPELINE\-DESCRIPTION
+\fBgst\-launch\-ext\fR \fIfilename [filename...]\fR
 .SH "DESCRIPTION"
 .LP 
 \fIgst\-launch\-ext\fP is a tool that is used to run a basic predefined \fIGStreamer\fP pipeline.

tools/gst-visualise

+#!/usr/bin/perl -w
+
+# launch a gst-launch pipeline to display a visualisation of the 
+# input audio.
+# make use of default input srcs.
+# visualisation plugin is specified on command line.
+
+### packages
+
+use File::Basename;
+
+
+my (%pipes, %cfg);
+
+sub read_config
+{
+  my $config_file = `echo -n ~`."/.gst";
+  if (-e $config_file)
+  {
+    open CONFIG, $config_file;
+    while (<CONFIG>)
+    {
+      chomp;
+      s/#.*//;
+      s/\s+$//;
+      next unless length;
+      my ($var, $value) = split (/\s*=\s*/, $_, 2);
+      $cfg{$var} = $value;
+    }
+    if (!($cfg{AUDIOSRC}))
+    {
+      print "Please add an AUDIOSRC to $config_file !\n";
+    }
+    if (!($cfg{VIDEOSINK}))
+    {
+      print "Please add a VIDEOSINK to $config_file !\n";
+    }
+  }
+  else
+  {
+    print "No configuration file $config_file found.  You might want to create one.\n";
+  }
+  if (!defined $cfg{AUDIOSRC})   { $cfg{AUDIOSRC} = "esdmon"; }
+  if (!defined $cfg{VIDEOSINK})  { $cfg{VIDEOSINK} = "sdlvideosink"; }
+  if (!defined $cfg{CVS_PATH})   { $cfg{CVS_PATH} =  `echo -n ~`."/gst/cvs"; }
+}
+
+sub visualise(@)
+{
+    my $vis = $cfg{VISUALIZER};
+    $vis = shift() if ($#_ != -1);
+    $vis = "goom" unless $vis;
+
+    my $pipe;
+    $pipe = $vis unless $pipe = $pipes{$vis};
+
+    $command = "gst-launch $cfg{AUDIOSRC} ! $pipe ! { queue ! colorspace ! $cfg{VIDEOSINK} }";
+    print "Running $command\n";
+    system ("PATH=\$PATH:".$cfg{CVS_PATH}."/gstreamer/tools $command");
+}
+
+### main
+
+read_config ();
+
+%pipes = ( 
+  "goom", "goom",
+  "chart", "chart",
+  "synaesthesia", "synaesthesia",
+  "monoscope", "monoscope"
+);
+
+if ($#ARGV > 0) {
+    print STDERR "Usage: gst-visualise [visualiser]\n";
+    exit 1;
+}
+
+visualise(@ARGV);
+

tools/gst-visualise.1

+.TH "GStreamer" "1" "February 2002" "" ""
+.SH "NAME"
+gst\-visualise \- Run a GStreamer pipeline to display an audio visualisation
+.SH "SYNOPSIS"
+\fBgst\-visualise\fR \fI[visualiser]\fR
+.SH "DESCRIPTION"
+.LP 
+\fIgst\-visualise\fP is a tool that is used to run a basic \fIGStreamer\fP pipeline, to display a graphical visualisation of an audio stream.
+
+By default, the audio stream is read from ESD (the Enlightened Sound Daemon),
+but this can be changed by setting the AUDIOSRC parameter in ~/.gst.  For
+example, you might set "AUDIOSRC=osssrc" to display a visualisation of the
+sound input to your soundcard.
+
+You can select a visualiser by providing a parameter naming the visualiser.
+For example:
+
+ gst\-visualise synaesthesia
+
+will use the synaesthesia plugin.  If no visualiser is named, the VISUALIZER
+property in ~/.gst will be used.  If this is not specified either, the goom
+visualiser will be used.
+
+The videosink to use to display the visualisation will be read from the
+VIDEOSINK parameter in ~/.gst, defaulting to sdlvideosink.
+
+.SH "SEE ALSO"
+.BR gst\-launch\-ext (1),
+.BR gst\-guilaunch (1),
+.BR gst\-complete (1),
+.BR gst\-register (1),
+.BR gst\-inspect (1),
+.BR gst\-launch (1),
+.SH "AUTHOR"
+The GStreamer team at http://gstreamer.net/