/usr/lib/pd/extra/pdp/introduction/input_output.pd is in pd-pdp 1:0.14.1-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | #N canvas 250 34 894 848 10;
#X obj 107 427 pdp_v4l;
#X obj 107 53 metro 40;
#X msg 159 14 stop;
#X msg 107 14 bang;
#X msg 51 14 bang;
#X obj 107 695 pdp_glx;
#X msg 209 93 open /dev/video0;
#X msg 209 117 open /dev/video1;
#X text 347 95 you can choose the input device using the 'open' message.
the default is /dev/video0;
#X msg 209 142 close;
#X text 348 143 closes the video port;
#X msg 209 168 type yv12;
#X msg 209 192 type grey;
#X text 348 171 type sets the ouput image package type. currently only
yv12 (luma/chroma color) and greyscale are supported.;
#X msg 210 221 dim 320 240;
#X msg 210 244 dim 640 480;
#X text 348 215 dim sets the dimensions of the captured frame. please
note that in all objects dimensions and packet type (color/greyscale)
have to be the same to be combined (i.e. mixed);
#X msg 210 556 dim 320 240;
#X msg 210 579 dim 640 480;
#X text 349 559 dim sets the window dimensions;
#X msg 210 510 create;
#X msg 210 531 destroy;
#X text 208 447 pdp_glx ouputs video in a window using the GLX extension.
if your graphics card/driver supports it you can have multiple output
windows. if a pdp message is received and a window is not open \, one
is created automaticly.;
#X text 349 513 use these messages to explicitly create/destroy the
window;
#X text 207 18 pdp_v4l grabs video from the video4linux device. it
grabs a frame whenever a bang message is received. the output rate
is limited by the maximum framerate of the video device. if there is
no device opened \, it will attempt to open /dev/video0;
#X msg 212 627 cursor \$1;
#X obj 212 607 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X text 348 627 enables/disables cursor in xv window;
#X msg 210 319 channel \$1;
#X floatatom 210 295 5 0 0 0 - - -;
#X text 347 320 sets the v4l channel (like tuner \, composite \, svideo
\, ...);
#X floatatom 210 359 5 0 0 0 - - -;
#X msg 210 383 freq \$1;
#X floatatom 271 359 5 0 0 0 - - -;
#X msg 271 383 freqMHz \$1;
#X text 346 359 sets the v4l tuner frequency (in v4l units and MHz)
;
#X text 347 655 specify the x window display;
#X msg 212 653 display :0;
#X obj 107 748 print;
#X text 211 745 the output channel sends mouse event messages (press/release/drag
and individual p/r/d for each button);
#X connect 0 0 5 0;
#X connect 1 0 0 0;
#X connect 2 0 1 0;
#X connect 3 0 1 0;
#X connect 4 0 0 0;
#X connect 5 0 38 0;
#X connect 6 0 0 0;
#X connect 7 0 0 0;
#X connect 9 0 0 0;
#X connect 11 0 0 0;
#X connect 12 0 0 0;
#X connect 14 0 0 0;
#X connect 15 0 0 0;
#X connect 17 0 5 0;
#X connect 18 0 5 0;
#X connect 20 0 5 0;
#X connect 21 0 5 0;
#X connect 25 0 5 0;
#X connect 26 0 25 0;
#X connect 28 0 0 0;
#X connect 29 0 28 0;
#X connect 31 0 32 0;
#X connect 32 0 0 0;
#X connect 33 0 34 0;
#X connect 34 0 0 0;
#X connect 37 0 5 0;
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