#!/bin/bash
#
# Developer: Alper KANAT <alperkanat at raptiye dot org>
# Contributor: Ricky Cintron <borosai at gmail dot com>
#
# Script name: ipodenc
# Purpose: Used to transcode existing video files
# 		     into ipod-friendly .mp4 files.

# Resulting format of the video (Available Options: mov, mp4)
FORMAT="mp4"
# Video Size (Available Options: 320:240, 640:480)
SIZE="320:240"
# Aspect Ratio (Available Options: 4/3, 16/9)
ASPECT_RATIO="4/3"
# Audio Bitrate (Available Recommended Options: 96, 128, 320)
A_BITRATE=320
# Subtitle Codepage
SUB_CP="iso8859-9"
# Subtitle Size
SUB_SIZE=4

# Log File. It will be saved in the same directory. (Available Options: 0, 1)
LOG=0

if [ $LOG -ge 0 -a $LOG -le 1 ]; then
	if [ $LOG -eq 0 ]; then
		log2here="/dev/null"
	else
		log2here="`basename $0`-log.txt"
	fi
else
	echo
	echo "LOG Switch can only be 1 or 0."
	echo
	exit 0
fi

help_usage ()
{
	echo
	echo "Usage: `basename $0` -a \"Artist\" -n \"Name\" -s /path/to/subtitle.ext /path/to/sourcefile.ext"
	echo
	echo "Options:"
	echo "  -a  Artist name for destination file"
	echo "  -n  Track name for destination file"
	echo "  -s  Subtitle file to be used"
	echo
	echo "Note: The source file is required."
	echo
	exit 1
}

if [ $# -lt 1 ]; then
	help_usage
elif [ $# -gt 7 ]; then
	echo ""
	echo "Incorrect number of parameters."
	help_usage
fi

while getopts a:n:s: opt
do
	case "$opt" in
		a)	if [ ! -f "$OPTARG" ]; then
				artist="$OPTARG"
			else
				help_usage
			fi;;
		n)	if [ ! -f "$OPTARG" ]; then
				name="$OPTARG"
			else
				help_usage
			fi;;
		s)	if [ -f "$OPTARG" ]; then
				sub="$OPTARG"
				echo
				echo "Subtitle detected."
			else
				echo
				echo "Missing or wrong subtitle."
				help_usage
			fi;;
		*)	help_usage;;
	esac
done

# Set the index to the filename
shift $(($OPTIND - 1))

if [ -f "$1" ]; then
	source_filename="$1"
else
	echo
	echo "Missing or wrong filename."
	help_usage
fi

if [ -z "${artist}" ]; then
	artist="Unknown Artist"
fi

if [ -z "${name}" ]; then
	name="Unknown Name"
fi

echo
echo "Process starting..."
echo

if [ -z "${sub}" ]; then
	mencoder -quiet -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=2500:vqmin=2:vqmax=10:acodec=aac:vglobal=1:aglobal=1:abitrate=$A_BITRATE:aspect=$ASPECT_RATIO -oac lavc -lavfopts format=$FORMAT:i_certify_that_my_video_stream_does_not_use_b_frames -vf scale=$SIZE,harddup -of lavf -info artist="${artist}":name="${name}" -o "${artist} - ${name}.$FORMAT" "${source_filename}" &> "$log2here"
else
	mencoder -quiet -sub "${sub}" -subcp $SUB_CP -subfont-encoding unicode -subfont-text-scale $SUB_SIZE -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=2500:vqmin=2:vqmax=10:acodec=aac:vglobal=1:aglobal=1:abitrate=$A_BITRATE:aspect=$ASPECT_RATIO -oac lavc -lavfopts format=$FORMAT:i_certify_that_my_video\_stream_does_not_use_b_frames -vf scale=$SIZE,harddup -of lavf -info artist="${artist}":name="${name}" -o "${artist} - ${name}.$FORMAT" "${source_filename}" &> "$log2here"
fi

echo
echo "Operation completed successfully!"
echo "$source_filename has been transcoded to `pwd`/${artist} - ${name}.$FORMAT"
echo