profiling bash script for work with rgba2fb.c (https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=264109)

yuvrgbfb

#!/bin/bash
if [[ rgb2fb.c -nt rgb2fb ]]; then
  echo "compiling rgb2fb.c"; gcc -O6 -Wall -pedantic -Wextra rgb2fb.c -o rgb2fb
fi

if [[ "$#" > 0 ]]; then t=$1; else t=600000; fi
raspividyuv -fps 90 -rgb -o - -pts $0.pts                    \
            -md 7 -w 640 -h 480 -n -t $t -awb greyworld | \
./rgb2fb 640 480 F 2> $0.txt

if [[ "$#" < 2 ]]; then exit; fi

paste -d";" \
<(echo "     fread[us]" && 
  awk 'NR%2==1 { printf "%6s\n",int($1/1000)"xxx" }' $0.txt | sort -n | uniq -c
) \
<(echo "      fill[us]" &&
  awk 'NR%2==0 { printf "%6s\n",int($1/100)"xx" }' $0.txt | sort -n | uniq -c
) \
<(awk 'NR==1 { }
  NR==2 { print ",0"; old=$1 }
  NR>2  { print int(1000*($1-old)+0.5); old=$1 }
  ' yuvrgbfb.pts > yuvrgbfb.csv

  us=`cat $0.csv | sort -n | uniq -c | sort -n | tail -1 | cut -b9-`
  l=`wc --lines $0.csv | cut -f1 -d\ `
  fps=$((1000000 / $us)) 
  echo "   $l frames were captured at ${fps}fps" 

  echo "   frame delta[us]"
  cat $0.csv | cut -f1 -d, | sort -n | uniq -c
) | sed 's/^;/              ;/;s/;;/;              ;/'