#!/bin/bash

# set shopt-options used by this shell-script
# Note, 0 (true) from shopt -q is "false" in a math context.
shopt -q globstar; globstar_set=$?
((globstar_set)) && shopt -s globstar
shopt -q extglob; extglob_set=$?
((extglob_set)) && shopt -s extglob

# return default shopt-options
function finish {
        ((globstar_set)) && shopt -u globstar
        ((extglob_set)) && shopt -u extglob
}
trap finish EXIT

print_help() {
  printf "Help: not implemented yet"
}

while getopts 'e:dh' flag; do
        case "${flag}" in
                e) extension+=("$OPTARG");;
                d) delete=true;;
                h) print_help
                exit 0;;
                *) exit 1 ;;
        esac
done

# Print available encoders
readarray -t encoders <<<$(ffmpeg -encoders -hide_banner|grep vp9)
echo "In FFMPEG verfügbare Encoder:"
for i in "${!encoders[@]}"; do
	echo "$i: ${encoders[i]}"
	#encoders[i]=$(echo ${encoders[0]} | awk '{print $2}')
done

# Choose an encoder
while :; do
	read -r -p "Choose an encoder [0]: " encoder
	[[ $encoder =~ ^[0-9]+$ ]] || { echo "Enter a valid number"; continue; }
	if ((encoder >= 0 && encoder < ${#encoders[@]})); then
		encoder=$(echo "${encoders[$encoder]}" | awk '{print $2}')
		break
	else
		echo "Not a valid encoder, try again"
	fi
done

# Choose an GPU, if encoder is GPU accelerated

# write array into string
extension="${extension[*]}"
# change separator
extension=${extension// /|}

for file in **/*.@($extension); do
	echo "$encoder"
	
	#https://wiki.archlinux.org/title/Hardware_video_acceleration

	#VP9_vaapi
	#Hardware video acceleration enabled
	#https://ffmpeg.org/ffmpeg-all.html#VAAPI-encoders
	#https://trac.ffmpeg.org/wiki/Hardware/VAAPI
	#ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD129 -i "$file" -map 0 -c copy -c:v vp9_vaapi -rc_mode CQP -look_ahead 1 -bf 2 -bsf:v vp9_raw_reorder,vp9_superframe -compression_level 0 -vf 'hwupload' Der\ VornameCqpLA.mkv
	
	#VP9_qsv
	#--enable-libmfx or --enable-libvpl and Hardware video acceleration enabled
	#libvpl vs. libmfx: https://www.intel.com/content/www/us/en/developer/articles/technical/onevpl-in-ffmpeg-for-great-streaming-on-intel-gpus.html
	#https://ffmpeg.org/ffmpeg-codecs.html
	#https://trac.ffmpeg.org/wiki/Hardware/QuickSync
	#https://www.intel.com/content/www/us/en/developer/articles/technical/common-bitrate-control-methods-in-intel-media-sdk.html
	#https://www.intel.com/content/www/us/en/developer/articles/technical/advanced-bitrate-control-methods-in-intel-media-sdk.html
	#ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD129 -i "$file" -c:v av1_qsv -vf 'hwupload' output.mkv

done