I'm not sure if anyone is aroundbut I'd figured I'd give this a try.

[Jeremy Greiner]

I'm working on a tool to decrypt the vob files from the dvd, using
libdvdcss however I'm having very little luck, the output vob appears to
still be scrambled (has a lot of the green blockyness)
This is the code I'm using currently:

m_CSSHandle is a dvdcss_t and m_Files is a class I built to derive the
sector location of the different files.

I used a tool called vStrip to verify the sector locations of the files
for the movie I was using, TROY ..

Any pointers and hints would be greatly appreciated .. I don't get any
errors, and the function always returns true however it seems scrambled.



bool CDecrypt::CSSDecryptFile(CString input_file, CString output_file)

{

            //grab the starting sector for the file

            int start = m_Files->GetVideoFileLBA(input_file);

            int end = m_Files->GetVideoFileLBA(input_file, true);



            //one sector

            byte buffer[2048];





            FILE * output = fopen(output_file, "w");

            if(output == NULL) return false;



            DVDCssSeek(m_CSSHandle, 490, DVDCSS_SEEK_KEY);



            //for(int i = start; i <= end; i++)

            for(int i = 490; i <= 78931; i++)

            {



                        //read 1 sector

                        if(DVDCssRead(m_CSSHandle, buffer, 1,
DVDCSS_NOFLAGS) != 1)

                        {

                                    return false;

                        }

                        //check to see if the buffer is scrambled

                        if(scrambled(buffer))

                        {

                                    if(DVDCssSeek(m_CSSHandle, i,
DVDCSS_SEEK_MPEG) == i)

                                    {


if(DVDCssRead(m_CSSHandle, buffer, 1, DVDCSS_READ_DECRYPT) != 1)

                                                {

                                                            return
false;

                                                }



                                                if(scrambled(buffer))

                                                {


AfxMessageBox("Error did not decrypt dvd.", MB_OK);

                                                            return
false;

                                                }





                                    }

                                    else

                                    {

                                                AfxMessageBox("Error did
not decrypt dvd.", MB_OK);

                                                return false;

                                    }

                        }

                        fwrite(buffer, sizeof(char), 2048, output);



            }

            fclose(output);

            return true;

}



Thanks in Advance

-jeremy

PS if you have any questions feel free to contact me via the list or
directly.

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