Banner Bash (Video sequence generator)

#! /bin/bash
#########################################################################
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#########################################################################
# AUTHOR:  Antonio Vanegas
# WEBPAGE: http://devel.androidsith.com
# DEMO:    http://www.youtube.com/watch?v=F-FiqQEy_OI
#
# DESCRIPTION:
# Video generator of numeric sequences (decremental, incremental, randomic)
#
# REVISION:
# ------------------------------------------------------------------------
# 20110422 Intial version, functions: Random Control via adb from Android
# 20110524 add functions incremental and decremental. Remove adb control
##########################################################################
# PACKAGE DEPENDS:
# apt-get install mplayer ffmpeg imagemagick bsdmainutils giflib-tools
##########################################################################
# CONFIG:
WORKDIR=/tmp
APPDIR=banner
TEMP=$WORKDIR/$APPDIR/tmp
CWIDTH=75                            # Character. Use 132 for frames<100 (best quality)
MODULO=100                           # random%MODULO Example: 100 -> (0-100)
RES="200x200"                        # recommended 600x900 (slow)
COLOR="255 0 10"                     # RGB
OUTPUTDATE=`date +%Y%m%d_%k%M%S`     # string to append file
PLAYVIDEO=1                          # Play video with parameters mplayer -fs -speed x xx.avi
##########################################################################

# Functions
show_help (){
  echo "Banner rev201105 (hpsaturn)"
  echo ""
  echo "SYNOPSYS:"
  echo "banner [command] [options]"
  echo "banner [command] frames speed"
  echo "banner [command] [int] [float]"
  echo "banner [command] [frames]"
  echo ""
  echo "EXAMPLES:"
  echo "banner decremental 20 0.8 (countdown)"
  echo "banner incremental 10"
  echo "banner random 100"
  echo ""
  echo "Speed: Optional, default 1"
  echo "Frames:0-9999"
  echo ""
}
run_video () {  # parameter: speed
  echo "Playing video:"
  mplayer -fs -speed $1 $TEMP/banner_out$OUTPUTDATE.avi 2>/dev/null
  echo "ok"
}
generate_img () { #parameters: input_number, output_name
  printerbanner -w $CWIDTH $1 | text2gif -c $COLOR > $TEMP/$2.gif
  convert -rotate 270 -resize $RES $TEMP/$2.gif $TEMP/out_$2.jpg 2> /dev/null
}
generate_video () {
  echo -n "Loading video.."
  ffmpeg -y -r 1 -i $TEMP/out_%04d.jpg -vcodec copy $TEMP/banner_out$OUTPUTDATE.avi 2>/dev/null
  echo "ok"
}
set_random(){
  echo  "Loading images"
  i=0;
  for (( k=0; k<=$1; k++ ))
  do
    i=`printf '%04d' $i`
    random=$((RANDOM%$MODULO))
    generate_img $random $i
    echo -n -e "\r$i/$1"
    i=`expr $i + 1`
  done
}
set_incremental(){
  echo "Loading images"
  i=0;
  for (( k=0; k<=$1; k++ ))
  do
    i=`printf '%04d' $i`
    generate_img $k $i
    echo -n -e "\r$i/$1"
    i=`expr $i + 1`
  done
}
set_decremental(){
  echo "Loading images"
  i=0;
  for (( k=$1; k>=0; k-- ))
  do
    i=`printf '%04d' $i`
    generate_img $k $i
    echo -n -e "\r$i/$1"
    i=`expr $i + 1`
  done
}
test_dirs(){
  mkdir -p $TEMP
}
clean_temp (){
  echo -n "Cleanning.."
  rm -r $WORKDIR/$APPDIR
  echo "ok"
}
# check parameters
if [ "$1" == "" ] ; then
  show_help
  exit 0
else
  COMMAND=$1
fi
if [ "$2" == "" ] ; then
  show_help
  exit 0
else
  FRAMES=$2
fi
if [ "$3" == "" ] ; then
  SPEED=1
else
  SPEED=$3
fi
########################################################
##                        MAIN                        ##
########################################################
test_dirs
currentdir=`pwd`

case "$COMMAND" in
  incremental)
    set_incremental $FRAMES
    ;;
  decremental)
    set_decremental $FRAMES
    ;;
  random)
    set_random $FRAMES
    ;;
  *)
    show_help
    exit 0
    ;;
esac
echo -e "\nok"

generate_video
if [ $PLAYVIDEO == 1 ] ; then
 run_video $SPEED
fi
echo "Output video: $currentdir/banner_out$OUTPUTDATE.avi"
mv $TEMP/banner_out$OUTPUTDATE.avi $currentdir/
clean_temp