/**[txh]********************************************************************

  Copyright (c) 2002 Salvador Eduardo Tropea.
  This file is covered by the GPL license.
  Este archivo esta protegido por la licencia GPL.

  #include <disclaimer.h>
  For use with material you have the rights to manipulate, avoid using this
program with encripted and/or copyrighted DVDs. Read mencoder documentation.

***************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>

// DVD Chapter, usually when you send to create a DVD you get the video in
// the chapter 1.
const int dvdChapter=1;
// This is only if you used profesional filmic cameras (i.e. 35 or 16 mm)
const int fpsOut=24;

// Recommended audio options
const int audioQuality=4,
          audioAlgoQuality=1;

// Output size, that's for a 650 Mb CD where you reserve some room for
// extra information and CD TOC.
const int aviSize=644;

int movieLen;

int LookForMovieLen(const char *file)
{
 FILE *f=fopen(file,"rt");
 if (!f) return 0;
 char b[200];
 while (!feof(f))
   {
    fgets(b,199,f);
    if (strncmp(b,"Video stream",12)==0)
      {
       float vbr,len;
       int size,bps,frames;
       if (sscanf(b,"Video stream:    %f kbit/s  (%d bps)  size: %d bytes  %f secs  %d frames",&vbr,&bps,&size,&len,&frames)!=5)
          return 0;
       //printf("%s\n%f %d %d %f %d\n",b,vbr,bps,size,len,frames);
       movieLen=(int)(len+0.9);
       int h,m,s,l;
       l=movieLen;
       h=l/3600; l-=h*3600;
       m=l/60;   l-=m*60;
       s=l;
       printf("Movie length: %d:%02d:%02d aprox. (%d s)\n",h,m,s,movieLen);
       return 1;
      }      
   }
 return 0;
}

int main(int argc, char *argv[])
{
 // Remove temporal files
 unlink("frameno.avi");
 unlink("test.avi");
 unlink("subtitles.idx");
 unlink("subtitles.sub");
 unlink("lavc_stats.txt");

 char b[PATH_MAX];
 sprintf(b,"mencoder dvd://%d -ofps %d -ovc frameno -oac mp3lame -lameopts aq=%d:q=%d -aid 128 -o frameno.avi -slang es -vobsubout subtitles -vobsuboutindex 0 -vobsuboutid es > mplayer_out.txt",
         dvdChapter,fpsOut,audioAlgoQuality,audioQuality);
 system(b);
 //printf("%s\n",b);

 struct stat st;
 if (stat("frameno.avi",&st)!=0)
   {
    printf("Error stating frameno.avi, operation aborted\n");
    return 1;
   }
 printf("Trying to generate a file of %d Mb\n",aviSize);
 printf("Audio size: %6.2f Mb\n",st.st_size/(double)(1<<20));
 unsigned sizeAvail=(aviSize<<20)-st.st_size;
 printf("Space available for the video: %6.2f Mb\n",sizeAvail/(double)(1<<20));

 if (!LookForMovieLen("mplayer_out.txt"))
   {
    printf("Unable to determine movie length :-(\n");
    return 2;
   }

 int videoBR=(int)(sizeAvail*8.0/movieLen/1000.0);
 printf("Video bit rate: %d Kb/s\n",videoBR);

 int i;
 for (i=1; i<=2; i++)
    {
     sprintf(b,"mencoder dvd://%d -ofps %d -vop scale=640:360 -sws 2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=%d:vhq:keyint=250:vbitrate=%d -oac copy -o movie.avi >> mplayer_out.txt",
             dvdChapter,fpsOut,i,videoBR);
     system(b);
     //printf("%s\n",b);
    }
 system("ls -lah");
 return 0;
}