Simple C program to modify and verify errors on SubRip subtitles

📚This is the final project of a C language seminar on university. It's a command line program that checks for usual errors on subtitles in SubRip format (usually with a .srt extension).

In the SubRip format, the sequence of subtitles are formatted like this:

Example of a SubRip subtitle:

• -f "filein" ← file is the file name to process

• -o "fileout" ← fileout is the file name where changes will be saved

• -b index ← deletes the subtitle on index

• -i startmilis endmillis "text" ← inserts a new subtitle text, starting on startmilis to endmilis

• -v ← validates the subtitle looking for the following errors:

  • index values are not ordered consecutive numbers
  • index numbers don't start on 1
  • subtitles are overlapped (subtitle i end_time is greater than subtitle i+1 start_time)
  • a subtitle lasts less than 1 second
  • a subtitle lasts more than 7 seconds
  • subtitle line too long (more than 36 characters)
  • too many characters per second (more than 25)
  • subtitle has more than 2 lines of text
  • less than 75 miliseconds between subtitle i end and subtitle i+1 start.

  If errors are found, the program must print the index of the respective subtitle and a description of the error, and keep validating the file.

• f parameter is mandatory and cannot repeat
• o parameter is mandatory if the file is modified with other parameters (all except -v) and cannot repeat
• the rest of parameters are opcional, all need to be processed , and processed in order
• parameters are received in any order
• if there are more than one -f or -o parameter a help message is displayed and the exit code is 1
• if a mandatory parameter is not received the previous message is displayed and the exit code is 2
• if a invalid parameter is received the help message is displayed and exit code is 3
• if the file in or file out cannot be opened or saved the exit code is 4.

Clone the repository

git clone https://github.com/fgerst/srt-parser.git

Compile the C source code using Makefile and GCC

cd srt-parser
make 

An example of a program invocation would be like this

> ./srt_parser -v -f "pine_barrens.srt" -o "pine_barrens_out.srt" -i 7000 8200 "Did you wrap the package?" -v -b 3 -v