GSOC - Multiprogram about ccextractor

[cfsmp3]

Some basic notes:

• Multi program requires lots of work in the "library-ation" part. We'll need to get rid of most globals, start using contexts for example.
• The function ts_readstream(void) (in ts_functions.cpp) is possibly the best way to start to understand the issues. That function reads from the transport stream until it can return a complete PES from the program with the correct PID (correct as in where the CC data is expected to be). It also parses PAT and PMT and discards unwanted packets. We will need to change that function so that it returns the next PES from any program.
• The function that calls ts_readstream() -ts_getmoredata()- then takes the PES data and sends it to the appropiate place (depending if it's H264, MPEG, Hauppage's proprietary format, etc). Since it already expects the packet to be prefiltered it doesn't do any kind of per-program magic.
• A very basic part of the job is already done: All PMTs are saved so we can keep track of programs in the transport stream. Now we will need to initialize 'per program' structures so we can keep track of status for each program.
• Since each program has its own closed caption data it follows that this 'per program' structure is where the CC decoder structures will live (as opposed of just having a couple of global as we do now).

[anshul1912]

Multiprogram support is completed as part of GSOC 15, using ccextractor with -multiprogram option allow user to output caption of multiple programs

[anshul1912]

This feature can be tested using /newRepository/TestFiles/General/Closedcaption_atsc_multiprog.ts in our gsoc repository.

using following cmd:
./ccextractor -multirogram /newRepository/TestFiles/General/Closedcaption_atsc_multiprog.ts

[cfsmp3]

I'm assigning this to Willem to validate and make sure our test suite deals OK with multiprogram, if it does I'll close the ticket.

[cfsmp3]

Sample TS: https://drive.google.com/drive/folders/0B_61ywKPmI0TQTZEMm5Tajd5RVU

[cfsmp3]

Closing - confirmed working.