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#!/bin/sh

if [ "$1" == "" ]; then
	MPDFILE=$(ls *.mpd)

	if [ "$MPDFILE" == "" ]; then
		echo "No .mpd file."
		exit 1
	else
		MPD="$PWD/$MPDFILE"
	fi
else
	# .mpd file, full path and just file
	MPD="$1"
	MPDFILE=$(basename "$1")
fi

# create temp dirs
rm -rf VIDEO AUDIO
mkdir VIDEO AUDIO

if [ "$MPDFILE" == "manifest.mpd" ]; then
	# new manifest format

	# get base URL, video & audio respresentation
	BASE=$(grep manifest "$MPD" | cut -d ">" -f 2 | cut -d "<" -f 1 | rev | cut -d "/" -f 2- | rev)
	VIDEO=$(grep "id=" "$MPD" | grep v1 | sort | head -1 | cut -d '"' -f 2)
	AUDIO=$(grep "id=" "$MPD" | grep a1 | sort | head -1 | cut -d '"' -f 2)

	# get number of chunks, generate sequence for use in URL
	DURATION=$(grep " r=" "$MPD" | uniq | cut -d "\"" -f 4)
	DURATION=$(($DURATION+2))
	DURATION=$(eval echo {1.."$DURATION"})

	# get initial video .mp4
	cd VIDEO
	wget --no-check-certificate --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 0 "$BASE/init-$VIDEO.mp4" -O IS.mp4

	cd ..

	# get initial audio .mp4
	cd AUDIO
	wget --no-check-certificate --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 0 "$BASE/init-$AUDIO.mp4" -O IS.mp4

	cd ..

	# dowload video & audio chunks
	for VAR in $DURATION; do
		# pad fragment number with zeroes for saving
		CHUNK=$(echo "000000$VAR" | rev)
		CHUNK=${CHUNK:0:6}
		CHUNK=$(echo "$CHUNK" | rev)

		cd VIDEO
		wget --no-check-certificate --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 0 "$BASE/fragment-$VAR-$VIDEO.m4s" -O "$CHUNK".m4s
		cd ..

		cd AUDIO
		wget --no-check-certificate --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 0 "$BASE/fragment-$VAR-$AUDIO.m4s" -O "$CHUNK".m4s
		cd ..
	done
else
	# old manifest format

	# get base URL, video & audio respresentation
	BASE=$(grep -i baseurl "$MPD" | cut -d ">" -f 2 | cut -d "<" -f 1)
	VIDEO=$(grep -i height "$MPD" | grep -i 576 | cut -d "\"" -f 2)
	AUDIO=$(grep -i audiosamplingrate "$MPD" |  cut -d "\"" -f 2)

	# get number of chunks, generate sequence for use in URL
	DURATION=$(grep " r=" "$MPD" | sort | uniq | head -1 | cut -d "\"" -f 6)
	DURATION=$(echo "000000$DURATION" | rev)
	DURATION=${DURATION:0:6}
	DURATION=$(echo "$DURATION" | rev)
	DURATION=$(eval echo {000000.."$DURATION"})

	# get initial video .mp4
	cd VIDEO
	wget --no-check-certificate "$BASE/$VIDEO/IS.mp4"

	cd ..

	# get initial audio .mp4
	cd AUDIO
	wget --no-check-certificate "$BASE/$AUDIO/IS.mp4"

	cd ..

	# dowload video & audio chunks
	for VAR in $DURATION; do
		cd VIDEO
		wget --no-check-certificate --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 0 "$BASE/$VIDEO/$VAR.m4s"
		cd ..

		cd AUDIO
		wget --no-check-certificate --retry-connrefused --waitretry=1 --read-timeout=20 --timeout=15 -t 0 "$BASE/$AUDIO/$VAR.m4s"
		cd ..
	done
fi

# merge video chunks
cd VIDEO
cat IS.mp4 *.m4s > video.mp4
cd ..

# merge audio chunks
cd AUDIO
cat IS.mp4 *.m4s > audio.mp4
cd ..

# merge video and audio streams to single AV file
ffmpeg -i VIDEO/video.mp4 -i AUDIO/audio.mp4 -c copy stream.mkv < /dev/null > /dev/null