lgd323_import.sh

#! /bin/sh

# LGD323 import script
#
# Takes 1- or 2-channel LGD323 dashcam video from ./input
# Renames video following below format and puts it in ./output
# If 2-channel:
#   - horizontally flips rear channel
#   - combines video horizontally, front channel on left

# Depends: basename bc cut ffmpeg

# output filename format
# YYYYMMDDThhmmss_<moving/parked>_<normal/motion/impact>.avi

# input filename format
# aaab_cccc_dddddddd_eeeeee_f.avi
# aaa      -> inf     normal
#             moe     motion
#             evt     impact
# b        -> 0       1-channel
#             1       2-channel
# cccc     -> index
# dddddddd -> YYYYMMDD
# eeeeee   -> hhmmss  (24-hour)
# f        -> I       normal
#             P       parking mode

source_dir="./input"
target_dir="./output"
used_dir="./processed"

declare -A modes=(   ["I"]="moving"
                     ["P"]="parked" )

declare -A reasons=( ["inf"]="normal"
                     ["moe"]="motion"
                     ["evt"]="impact" )

if [[ ! -d $target_dir ]]
then
    mkdir -p $target_dir
fi

if [[ ! -d $used_dir ]]
then
    mkdir -p $used_dir
fi

for f in ${source_dir}/*avi
do
    name=`basename -s .avi $f`

    why=`echo $name | cut -d'_' -f1 | cut -c -3`
    why=${reasons[$why]}
    chans=`echo $name | cut -d'_' -f1 | cut -c 4`
    chans=`echo $chans + 1 | bc`
    index=`echo $name | cut -d'_' -f2`
    date=`echo $name | cut -d'_' -f3`
    time=`echo $name | cut -d'_' -f4`
    mode=`echo $name | cut -d'_' -f5`
    mode=${modes[$mode]}

    echo "Recording $index: $chans-channel at ${date}T$time $mode mode because $why."
    new_filename="${date}T${time}_${mode}_${why}"
    echo "New base filename: $new_filename"

    if [[ $chans -eq "2" ]]
    then
        echo "Combining 2-channel video side-by-side"
        ffmpeg -i $f -c:v libx264 -crf 18 -an -filter_complex "[0:v:1]hflip[rear];[0:v:0][rear]hstack=inputs=2[v]" -map "[v]" -an "${target_dir}/${new_filename}.avi"
        #echo "Splitting 2-channel video"
        #ffmpeg -i $f -map 0:0 -an -c copy "${target_dir}/${new_filename}_front.avi"
        #ffmpeg -i $f -map 0:1 -an -c copy "${target_dir}/${new_filename}_rear.avi"
    else
        echo "Copying 1-channel video"
        cp $f "${target_dir}/${new_filename}.avi"
    fi
        
    mv $f $used_dir
done