record-level

#!/bin/bash

# Records a level to a GIF

# Prerequisites:
# sudo apt-get install wmctrl byzanz ffmpeg

set -e
set -u

LEVEL="$1"
RECORD_DURATION="${2:-12}"
OUTPUT_FILE="${3:-out.gif}"
WINDOW_X="${4:-50}"
WINDOW_Y="${5:-50}"
WINDOW_WIDTH="${6:-400}"
WINDOW_HEIGHT="${7:-300}"
RECORD_X="${8:-120}"
RECORD_Y="${9:-100}"
RECORD_WIDTH="${10:-300}"
RECORD_HEIGHT="${11:-255}"
RECORD_START="${12:-2}"

function wait_for_window()
{
    echo -n "Waiting for a window called '$1' .."
    while ! wmctrl -l | \
        cut -d' ' --complement -f 1,2,3,4 | \
        grep '^'"$1"'$' > /dev/null; do
    {
        echo -n .
        sleep 1
    }; done
    echo " found"
}

function move_window()
{
    wait_for_window "$1"
    echo "Moving window '$1' to position '$2'."
    sleep 1
    wmctrl -F -r "$1" -e "0,$2"
}

function close_window()
{
    echo "Closing window '$1'."
    wmctrl -F -c "$1"
}


# Position the window

./runrabbit swing &

move_window \
    "Rabbit Escape" \
    "${WINDOW_X},${WINDOW_Y},${WINDOW_WIDTH},${WINDOW_HEIGHT}"

sleep 1
close_window "Rabbit Escape"


# Record the action

TMP_OUTPUT=$(tempfile -s ".flv")

echo "Running level ${LEVEL}, recording to ${TMP_OUTPUT}"

./runrabbit swing "--level=${LEVEL}" --solution=1 &

byzanz-record \
    "--x=${RECORD_X}" "--y=${RECORD_Y}" \
    "--width=${RECORD_WIDTH}" "--height=${RECORD_HEIGHT}" \
    "--delay=${RECORD_START}" "--duration=${RECORD_DURATION}" \
    "${TMP_OUTPUT}"

close_window "Rabbit Escape"

echo "Converting to a GIF in '${OUTPUT_FILE}'"

PALETTE="/tmp/palette.png"

# If you want to scale or change fps:
#FILTERS="fps=15,scale=320:-1:flags=lanczos"

# Generate optimal palette
set -x
ffmpeg \
    -loglevel error \
    -i "${TMP_OUTPUT}" \
    -vf "palettegen" \
    -y \
    $PALETTE

ffmpeg \
    -loglevel error \
    -i "${TMP_OUTPUT}" \
    -i $PALETTE \
    -lavfi "paletteuse" \
    -y \
    "${OUTPUT_FILE}"