gstreamer

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History

Benjamin Otte 42827c7be8 gst/level/gstlevel.c: add proxying getcaps function, so level doesn't advertise impossible caps Original commit message from CVS: * gst/level/gstlevel.c: (gst_level_init): add proxying getcaps function, so level doesn't advertise impossible caps		2004-03-24 14:04:53 +00:00
..
.gitignore	tagging stuff and build fixes. In detail:	2003-11-24 04:08:47 +00:00
demo.c	gst-indent	2004-03-14 22:34:33 +00:00
filter.func	gcc-2.95 fixage	2003-10-14 10:07:59 +00:00
gstlevel-marshal.list	added second example with plotting fixed some aesthetics	2003-09-26 16:45:04 +00:00
gstlevel.c	gst/level/gstlevel.c: add proxying getcaps function, so level doesn't advertise impossible caps	2004-03-24 14:04:53 +00:00
gstlevel.h	*.h: Revert indenting	2004-03-15 16:32:54 +00:00
Makefile.am	gst/: -marshal.[ch] and -enum.[ch] files should not be disted, -marshal.h files should not be installed, and -enum.h ...	2004-02-27 02:39:18 +00:00
plot.c	don't mix tabs and spaces	2004-03-15 19:32:27 +00:00
README	added second example with plotting fixed some aesthetics	2003-09-26 16:45:04 +00:00

README

level plugin by thomas <thomas@apestaart.org>

this plugin signals:
  - running time since last EOS/start
  - channel
  - RMS level
  - peak level
  - decaying peak level
over the given interval.

This is useful for a VU meter display and for plotting out the signal graph.
The VU meter can either display RMS, or display immediate peak level and
have the falloff decaying peak level displayed as a line.

The interval for signal emission, ttl of decay peak, and falloff of decay peak
can all be set.

The element only takes unsigned data in; it could be extended to signed as
well, if separate fast chain functions are made that displaces the incoming
data to its midpoint (ie, 0,65535 should be mapped to -32768, 32767)

There are two demo apps, apps and plot.  apps will create some GTK sliders
to display the volume.  plot will output data readable by gnuplot.

Here is a sample plot script to plot output of the plot command that was
stored to plot.dat

set xlabel "Seconds"
set ylabel "dB"
set yrange [-60:0]
plot 'plot.dat' using 1:2 title 'L RMS' with lines, \
     'plot.dat' using 1:3 title 'L peak' with lines, \
     'plot.dat' using 1:4 title 'L decay' with lines

plot 'plot.dat' using 1:5 title 'R RMS' with lines, \
     'plot.dat' using 1:6 title 'R peak' with lines, \
     'plot.dat' using 1:7 title 'R decay' with lines