#!/bin/sh
# Copyright © 2001-2005 Jamie Zawinski <jwz@dnalounge.com>
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation.  No representations are made about the suitability of this
# software for any purpose.  It is provided "as is" without express or 
# implied warranty.
#
# Created: 23-May-2001.

PATH=/usr/local/bin:$PATH
PATH=/home/jwz/src/slideshow:$PATH
export PATH

copyright="
    DNA Lounge Live Webcam: http://www.dnalounge.com/cam/
    %%DATE%%

    Copyright (c) %%YEAR%% by DNA Lounge, http://www.dnalounge.com/
    Unauthorized use or reproduction prohibited.

"

progname=slideshow-grab

file1="html/live.jpg"
file2="html/live2.jpg"
file3="html/live-thumb.jpg"
tmp1="${file1}.~1~"
tmp2="${file1}.~2~"

# size of the resultant image
 width1=480
height1=360
 width2=640
height2=480
 width3=120
height3=90

rm -f "$tmp1" "$tmp2"

check_for_signal() {
  lines=`od -b -w24 $1 | head -20 | wc -l`
  if [ "$lines" -lt 10 ]; then
    # The image must be all one color (blue, or black, or something.)
    # So there's no signal.  So replace it with colorbars.
    djpeg < colorbars.jpg > $1
  fi
}


grab_one() {
  year=`date '+%Y'`
  date=`date '+%a, %d-%b-%Y %l:%M:%S %p %Z'`
  tdate=`date '+%Y%m%d%H%M.%S'`
  copy=`echo "$copyright" | sed "s/%%YEAR%%/$year/;s/%%DATE%%/$date/"`

#  bttvgrab -N NTSC -d q -w $width2 -W $height2 -l 1 -o ppm -Q -f "$tmp1"

  # evidence suggests that bttvgrab eats my ass: let's try "streamer" from
  # the xawtv package now.  (It requires the file name to end in .ppm.)
  #
  rm -f "$tmp1.ppm"

  # from xawtv
  # streamer -n NTSC -q -s "${width2}x${height2}" -o "$tmp1.ppm" 2>/dev/null

  # from http://ovcam.org/ov511/download/apps/w3cam-0.7.2.tar.gz
  # note: "-n ntsc" gets "ioctl (VIDIOCGCHAN): Invalid argument", so make sure
  # we've done "v4lctl setnorm ntsc" first (slideshow-grab-loop.sh does)
  vidcat -d /dev/video0 -b -f ppm -s "${width2}x${height2}" > "$tmp1.ppm" 2>/dev/null

  if [ \! -s "$tmp1.ppm" ]; then
    echo "$progname: no image grabbed" >&2
    exit 1
  fi
  mv "$tmp1.ppm" "$tmp2"

  # save away a large copy of the file...
  ppmnorm < "$tmp2" 2>/dev/null | cjpeg -q 90 > "$file2"

  # ...then scale it down, and go to work on the small version.
  pnmscale -xysize $width1 $height1 < "$tmp2" > "$tmp1"

  check_for_signal "$tmp1"

  ppmcaption "$tmp1" - \
    -pos  10,-5 -left  -text "DNA Lounge" \
    -pos -10,-5 -right -text "$date" \
  > "$tmp2"

  # create medium image
  cjpeg < "$tmp2" | wrjpgcom -replace -comment "$copy" > "$tmp1"
  touch -t "$tdate" "$tmp1"
  mv "$tmp1" "$file1"

  # create thumb image
  pnmscale -xysize $width3 $height3 < "$tmp2" | cjpeg -q 50 -opt > "$tmp1"
  touch -t "$tdate" "$tmp1"
  mv "$tmp1" "$file3"

  rm -f "$tmp2"

  # now that the medium image has been created, save away the large image
  # and the thumbnail.
  #
  slideshow-archive.pl $file2 $file3
  # logger -t "$progname" "... `ls -lGFd $file2`"
}

grab_one
exit 0