Base for a multi-threaded video player

C and C++ flavors

Two versions are available in C and C++ directories

1. C using POSIX Threads (Pthreads) or C threads version
2. C++ using C++ threads version

References

The idea came from the excellent ffmepg + SDL tutorial http://dranger.com/ffmpeg/

This videoplayer does not use ffmpeg but libogg, libtheora and libvorbis. It uses also SDL2 for the rendering and playing sound.

The ogg/vorbis ogg/theora tutorials of https://bluishcoder.co.nz/tags/ogg/index.html are a very good material for understanding of the libraries.

The synchronization is quite different. This code uses 1 thread per stream and common real-time deadline to set up synchronization. The sound playing is mostly managed by SDL2. The displayed frame is used with an additional thread and producer/consumer algorithms to synchronize stream reading and displaying.

Compilation and unit testing

The compilation process use Cmake

To compile: sh cd build cmake .. make make test # C only make check # C only

Goal

The goal is to complete and parallelize the provided code using the hints of the subject.

Actions that threads managed

1. reading initialization packet in ogg file; init the sdl (video and audio)
2. initializing the theora stream
3. initializing the vorbis stream
4. reading packets in ogg file (twice, each stream reading thread)
5. decoding theora
6. decoding vorbis
7. displaying the video stream with the sdl
8. playing the sound with the sdl

Threads

1. Thread 1: main thread; init the sdl
2. Thread 2: theora stream reading and decoding video, write texture
3. Thread 3: vorbis stream reading and decoding sound
4. Thread 4: displaying video frame