mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-08 21:28:45 +00:00
Original commit message from CVS: * gst/level/gstlevel.c: (gst_level_init): add proxying getcaps function, so level doesn't advertise impossible caps |
||
---|---|---|
.. | ||
.gitignore | ||
demo.c | ||
filter.func | ||
gstlevel-marshal.list | ||
gstlevel.c | ||
gstlevel.h | ||
Makefile.am | ||
plot.c | ||
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