| 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 |
| |
| |
