#!/bin/bash

# Este script pasa un Divx a VCD. Para los archivos temporales se
# necesita al menos 4.5 Gigas (m1v y mpa, los .mpg y los .bin)

DIR=`pwd`
TEMPFOLDER=/tmp/divx2vcd-$RANDOM
TEMP_TEMPLATE=/tmp/tcmplex-template-$RANDOM

# CDSIZE Values. VCDs are write in Mode 2, so the filesizes are the
# the following: 
#	74 Min/650Mb ---> CDSIZE=735
#	80 Min/700Mb ---> CDSIZE=795
CDSIZE=795
#VIDEORATE=1150
AUDIORATE=224

if [ $# -eq 0 ]; then
	echo "Usage:"
	echo "        divx2vcd <divxfile>"
	exit 1
fi

FILE=$1
if [ "$1" == "`basename \"$1\"`" ]; then
	FILE="$DIR/$1"
fi

mkdir $TEMPFOLDER
cd $TEMPFOLDER

tcprobe -i "$FILE" > $TEMPFOLDER/info

WIDTH=`grep '\[avilib\] V:' $TEMPFOLDER/info | \
  perl -e ' $line=<STDIN> ; $line =~ /width=(\d+)/  ;  print $1' `
HEIGHT=`grep '\[avilib\] V:' $TEMPFOLDER/info | \
  perl -e ' $line=<STDIN> ; $line =~ /height=(\d+)/  ;  print $1' `
FPS=`grep '\[avilib\] V:' $TEMPFOLDER/info | \
  perl -e ' $line=<STDIN> ; $line =~ /V: (.+?) fps/  ;  print $1' `
FPS_1=`echo "scale=1 ; $FPS/1"| bc -l`
FRAMES=`grep '\[avilib\] V:' $TEMPFOLDER/info | \
  perl -e ' $line=<STDIN> ; $line =~ /frames=(\d+)/  ;  print $1' `
SEGUNDOS_TOTAL=`echo "scale=0 ; ($FRAMES / $FPS)"| bc -l`
HORAS=`echo "scale=0 ; ($SEGUNDOS_TOTAL / 3600)"| bc -l`
MINUTOS=`echo "scale=0 ; (($SEGUNDOS_TOTAL - 3600 * $HORAS)/60)"| \
  bc -l`
SEGUNDOS=`echo "scale=0 ; ($SEGUNDOS_TOTAL % 60)"| bc -l`

echo "*************** FILE INFO ***************"
echo "Frame Size: ${WIDTH}x${HEIGHT}  -   FPS: $FPS"
echo "Length: $FRAMES   -  Seconds: $SEGUNDOS_TOTAL"
echo "$HORAS hours, $MINUTOS minutes, $SEGUNDOS seconds"

if [ $FPS_1 == "29.9" -o $FPS_1 == "30" -o  $FPS_1 == "23.9" ]; then
	WIDTH_OUT=352
	HEIGHT_OUT=240
else
	WIDTH_OUT=352
	HEIGHT_OUT=288
fi

echo "Video Output: ${WIDTH_OUT}x${HEIGHT_OUT}"

# Ahora calculamos los valores pa los bordes.

ANCHO_1_1_OUT=`echo "($HEIGHT_OUT * 4/3)"| bc -l`
ALTO_OUT=`echo "$HEIGHT / ($WIDTH / $ANCHO_1_1_OUT)" | bc -l`
# Redondeamos
ALTO_OUT=`echo "scale=0 ; $ALTO_OUT/1"| bc -l`
# Nos aseguramos de que sea par
ALTO_OUT=`echo "scale=0 ; $ALTO_OUT+$ALTO_OUT%2" | bc -l`

BORDE=`echo "scale=0 ; ($HEIGHT_OUT-$ALTO_OUT)/2"| bc -l`
echo "alto sin bordes: $ALTO_OUT, con borde: $BORDE"

# Borramos Pelicula.m1v y Pelicula.mpa
rm -f Pelicula.m1v Pelicula.mpa 


cd $TEMPFOLDER

echo "transcode -i \"$FILE\" -V -x mplayer -y mpeg2enc,mp2enc \
  -F 1 -Z ${WIDTH_OUT}x$ALTO_OUT -Y -$BORDE,0,-$BORDE,0 \
  --export_asr 2 -E 44100  -b $AUDIORATE -o $DIR/Pelicula"
transcode -i "$FILE" -V -x mplayer -y mpeg2enc,mp2enc \
  -F 1 -Z ${WIDTH_OUT}x$ALTO_OUT -Y -$BORDE,0,-$BORDE,0 \
  --export_asr 2 -E 44100  -b $AUDIORATE -o $DIR/Pelicula 

RETVAL=$?
if [ $RETVAL -ne 0 ]; then
	echo -e "\n**** ERROR during transcoding. Code $RETVAL"
	exit 1
fi


rm $TEMPFOLDER/*
rmdir $TEMPFOLDER

cd $DIR

# Si no hay Pelicula.m1v y Pelicula.mpa salir
[ -f Pelicula.m1v -a -f Pelicula.mpa ] || exit 1

rm -f Pelicula*.mpg

#Ahora multiplexamos el .mpg
echo "maxFileSize = $CDSIZE" > $TEMP_TEMPLATE
tcmplex -i Pelicula.m1v -p Pelicula.mpa -o Pelicula.mpg \
  -m 1 -F $TEMP_TEMPLATE
rm $TEMP_TEMPLATE

[ -n "`ls Pelicula*mpg 2> /dev/null`" ] || exit 1

# Y creamos las imagenes...
for i in `ls Pelicula*mpg` ; do
	vcdimager -t vcd2 -c $i.cue -b $i.bin $i
	RETVAL=$?
	if [ $RETVAL -ne 0 ]; then
		echo -e "\n**** ERROR creating VCD images. Code $RETVAL"
		exit 1
	fi
done

echo -e "\n****** VCD creation finished successfully"