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#!/bin/sh
#
# Copyright (C) 2017 Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>
#
# 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/>.
set -e
FFMEG="ffmpeg"
ADB_PATH="adb"
FB_PATH="/dev/graphics/fb0"
SSH_HOST=""
TMP_FB="fb_raw"
TMP_FB_RS="fb_raw_rs"
RECOVERY=false
ssh_wrapper()
{
if [ "$1" = "shell" ] ; then
shift 1
ssh "${SSH_HOST}" "su -c \"$@\""
elif [ "$1" = "pull" ] ; then
shift 1
scp ${SSH_HOST}:$@
fi
}
print_usage () {
echo
echo "Usage: $0 [OPTIONS] -f OUTPUT.PNG"
echo " $0 [OPTIONS] --filename OUTPUT.PNG"
echo
echo "Options:"
echo "-r, --recovery Device is booted in recovery mode"
echo "-s, --screen-size Specify screen size (mandatory in recovery mode)"
echo "-h, --ssh-host Connect to the given host through SSH"
echo
}
print_recovery_advice () {
echo "For screenshots in recovery mode, the screen size needs to be specified,"
echo "e.g. with \"-s 720x1280\""
}
get_screen_size () {
if [ -f $( $ADB shell command -v wm ) ]; then
echo "Screen size can't be determined. Are you in recovery mode?"
print_recovery_advice
exit 1
fi
SCREEN_SIZE=$( $ADB shell wm size )
SCREEN_SIZE=$( echo ${SCREEN_SIZE#*: } | tr -d '\r' )
echo "Screen size is $SCREEN_SIZE"
}
take_screenshot () {
SCREEN_SIZE_X=${SCREEN_SIZE%x*}
SCREEN_SIZE_Y=${SCREEN_SIZE#*x}
if [ $RECOVERY = true ]; then
BS=$(( $SCREEN_SIZE_X * 4 ))
PIX_FMT="bgr0"
else
BS=$(( $SCREEN_SIZE_X * 2 ))
PIX_FMT="rgb565"
fi
$ADB shell "cat $FB_PATH > /data/local/tmp/$TMP_FB"
$ADB pull /data/local/tmp/$TMP_FB $TMP_FB
dd bs=$BS count=$SCREEN_SIZE_Y if=$TMP_FB of=$TMP_FB_RS
$FFMEG -vcodec rawvideo -f rawvideo -pix_fmt $PIX_FMT -s $SCREEN_SIZE \
-i $TMP_FB_RS -f image2 -vcodec png $OUTFILE
# cleanup
rm -f $TMP_FB $TMP_FB_RS
}
while true
do
case "$1" in
-r|--recovery)
RECOVERY=true
shift
;;
-f|--filename)
OUTFILE="$2"
shift 2
;;
-s|--screen-size)
SCREEN_SIZE="$2"
shift 2
;;
-h|--ssh-host)
SSH_HOST="$2"
shift 2
;;
"")
break
;;
*)
echo "Unknown option"
print_usage
exit 1
;;
esac
done
if [ -z "${SSH_HOST}" ] ; then
ADB="$ADB_PATH"
else
ADB="ssh_wrapper"
fi
if [ "$OUTFILE" = "" ]; then
echo "No output file specified"
print_usage
exit 1
fi
if [ $RECOVERY = true ] && [ -f $SCREEN_SIZE ]; then
print_recovery_advice
exit 1
fi
if [ $RECOVERY = false ] && [ -f $SCREEN_SIZE ]; then
get_screen_size
fi
take_screenshot
echo "Finished successfully"
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