View source for SoC 2021

{{DISPLAYTITLE:Google Summer of Code 2021}}
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This page gives the current list of ideas for VideoLAN project, for the [https://summerofcode.withgoogle.com Google Summer Of Code 2021] program.

The list is long, but it is not exhaustive, and  not limitative. Feel free to apply with '''your own idea!''', we love original ideas.

== Introduction &amp; Information  ==
[[File:Asterix VLC.svg|frameless|right]]

This page covers the [[VideoLAN]] program as a mentoring organization for [http://code.google.com/soc/ Google Summer of Code], in order to improve [[VLC]], [[VLMC]] and [https://code.videolan.org/videolan/dav1d dav1d] (or the [[libVLC]] engine), but also the VideoLAN infrastructure and some other related projects.

We have projects in '''C''', '''C++''', '''ASM''', '''JS''',  '''Wasm''', '''Go''', '''Obj-C''', '''GPU Shaders''', '''C#''', '''Java/Kotlin''' and '''Swift'''.

=== Summer of Code ===

Google Summer of Code is a way for '''university students''' to have a paid '''internship''' by '''Google''' to work on open source projects and become top developers!

[[VideoLAN]] was a ''Google Summer of Code'' mentoring organization in [[SoC 2007|2007]], [[SoC 2008|2008]], [[SoC 2009|2009]], [[SoC 2010|2010]], [[SoC 2011|2011]], [[SoC 2013|2013]], [[SoC 2016|2016]], [[SoC_2017|2017]], [[SoC_2018|2018]], [[SoC_2019|2019]] and [[SoC_2020|2020]].

This page lists some ideas for Summer of Code projects on '''dav1d''', VLMC, '''libVLC''' and {{VLC}}, but also on ''VLC infrastructure'' projects.

=== VLC & libVLC  ===

{{VLC}} is a cross-platform multimedia player, encoder and streamer application. It is one of the most successful open-source projects worldwide. 

{{VLC}} is downloaded at an approximate monthly rate of 25 millions from the main website and that's not including third-party distributions (Linux)! 

You can find more information on [http://en.wikipedia.org/wiki/VLC_media_player VLC on Wikipedia] or on this [[Main Page|wiki]].

The engine of VLC is '''libVLC''', and is used by '''VLMC''' and mobile versions of VLC.

=== dav1d ===

'''dav1d''' is the reference AV1 decoder that is shipped inside VLC, Chrome, Edge and Firefox.

It's a very low-level codec, mostly written in C and assembly.

=== VideoLAN Movie Creator ===
[[VLMC]] is a cross-platform non-linear video editing software based on libVLC technology. It was started as a final year student project at the French IT school [http://www.epitech.eu EPITECH].

[[VLMC]] currently awaits a transition to the current libvlc API and it's actual 1.0 release!

=== Summer of Code rules ===

If selected and developed, SoC projects for VLMC and VLC will be included in later releases.

All projects are covered by the GPL (v2+) or LGPL (v2.1+) licenses depending on the module.

The VideoLAN [[CoC|Code of Conducts]] applies to all Summer projects.

== How to Start ==
=== Find an idea ===
First, you need to find an idea.

This current page gives you a list of ideas. Those ideas are '''NOT exhaustive''': you can bring your own idea! Some of the best ideas we've ever had were '''custom''' ideas!

=== Submit your idea ===
You need to submit your idea on the ''Google Summer of Code'' platform.

You should do so, very quickly, even before having finished compilation and the next steps, so that we can give you early feedback.

=== Compile libVLC or VLMC ===
This may sound trivial, but it's harder than many expect. See https://wiki.videolan.org/Category:Building/ for more informations.

You should come on [[IRC]] to get help to compile.

=== Provide a small patch ===
To demonstrate your skills, share a small patch with us. This will let you become familiar with [[Git]], in case you don't know it already and our process on [[Sending Patches VLC|merging patches]].

=== Let's get in touch ===

If you have a doubt, are not sure about anything or want clarification, please get in touch with us.

We have 3 major communication channels:
* Our [https://mailman.videolan.org/mailman/listinfo mailing-lists] to discuss patches and further development related topics;
* Furthermore, we have our [http://forum.videolan.org web forums] for VLC-related end-user support - a VLMC section will be created once the product is published.
* Finally, there is our IRC channel ''#videolan'' (for libVLC) and ''#vlmc'' on the ''Freenode'' network. It's open to any kind of discussion. Usage issues, questions how to compile VLC/VLMC, getting to know the fellow developers, etc.

= Ideas for VLC & libVLC =
== Advanced Audio Filters ==

'''Project Description''':
We are looking for a skilled audiophile that knows a lot about audio theory and practice to work on new audio filters for VLC.

'''Tasks to do''':
* SRS WoW like or other 3D effects;
* channels mixing, notably upmixing, like Prologic-II;
* tracks mixing, and transitions;
* scriptable new audio filters in lua and enable users to create whatever audio filtering function they want in a Lua script;
* LADSPA or other libraries integration. 

'''Requirements''': 
This project needs some good audio knowledge and good C experience.

'''Qualification task:'''
Port any audio filter from MPlayer

''Proposed mentor: unidan ''

== VLC Qt interface work ==
'''Project Description''':
The VLC interface is quite outdated on Linux and Windows. It has a lot of features, but some are not properly exposed.

We are currently reworking the interface, but we need help.

'''Scope of the tasks to do''':

Use the new designs shared on the mailing list, and help developping part of those, using '''Qml'''.

This new interface is simpler, more user friendly, and has a better "media center" feel into it.

It requires integration with the media library and with the current interface.

Qml is the technology needed to improve the current UI.

'''Requirements''': 
This project requires '''Qt/C++''' knowledge, and qml would be a nice plus.

''Proposed mentor: Pierre''

== VLC.js ==
'''Project Description''':
We're currently porting VLC to the web, using WebAssembly. This is a current work in progress, so we need a lot of help to improve it

This requires working close to the toolchain, compilation and the web browsers.

'''Scope of the tasks to do''':

There are lots of things to do (not all of them need to be done by the same person:
* Improving compilation of the VLC core to Wasm,
* Improving compilation of VLC 3rd party libraries,
* Fixing the VLC core to support the Web platform,
* Implement WebCodec inside VLC,
* Improve audio pipeline inside VLC,
* Improve emscripten :)

'''Requirements''': 
This project requires '''C''' knowledge, and compilation.

''Proposed mentor: JB''

== VLC macOS interface  redesign ==
'''Project Description''':
The VLC interface is quite outdated on macOS and we are currently in the process of re-writing it to give it a modern feel, but also to integrate recent additions to libvlc regarding playback control and library management.

This project for the summer is to rework heavily this interface to make it beautiful and useful again.

'''Scope of the tasks to do''':

There is a full design already done and tested. The major hurdle is to actually implement it the way we want it to be. The iOS/tvTV interface is simpler, more user friendly, and has a better "media center" feel into it, which influenced what we want to achieve on the Mac. Note that the objective is to use AppKit. UIKit (aka "Marzipan") will not be part of this project.

Iterating from the current UI and closely collaborating with the team currently working on it is a requirement.

'''Requirements''': 
This project requires '''Obj-C''' knowledge, a thorough understanding of OOP and proven previous Mac development experience. You cannot use swift for this project.

''Proposed mentor: David Fuhrmann, Felix Paul Kühne''


== Scripting VLC with wasm ==
'''Project Description''':
We're would like to try to replace the lua scripting support of VLC with Wasm, like wasmer, directly inside VLC.

This requires working close to the toolchain, VLC and understanding C.

'''Scope of the tasks to do''':

There are lots of things to do:
* Study Wasm
* Embed wasm inside VLC
* Map VLC Scripts
* Improve emscripten  and wasm:)

'''Requirements''': 
This project requires '''C''' knowledge, and compilation.

''Proposed mentor: tguillem''


== VLC iOS UI update ==
'''Project Description''':
We're currently in the process of rewriting and updating the entire UI for VLC iOS 

There is a lot of components that need refactoring and need to get an updated UI. Like for example the network navigation section.

The Android port of VLC has done most of that and was successful. We need the same level of features.

'''Tasks to do''':

* Get an overview of the current App and components that need an update 
* Refactor and give the appropriate components a new look
* See what is missing compared to the Android version
* Code it :

'''Requirements''': 
This project requires '''Obj-C''' and '''Swift''' knowledge and ideally knowledge of writing tests for iOS but this can be learned.

''Proposed mentor: Soomin Lee, Felix Paul Kühne ''


== Interactive movie support ==

The idea is to add support for interactive movies inside VLC using the matroska.org mkv format. An interactive movie is like a gamebook but for movies.

'''Tasks to do''':
* Extend the MKV spec to add support for titles, menus, that will be used by interactive movies
* Improve a MKV muxing tool (ffmpeg, mkvtoolnix) to support the extended spec
* Add interactive movies support inside VLC's MKV module

Those will be done in '''C''' and '''C++'''

''Proposed mentor: Thomas Guillem, Steve Lhomme''


== Develop a MPD server inside VLC ==

The idea is to add support for VLC to act as a MPD server.

'''Tasks to do''':
* Study the MPD protocol
* Code a MPD server as a control module that will connect to the [https://code.videolan.org/videolan/medialibrary medialibrary]

Those will be done in '''C''' and '''C++''', and it requires familiarity with an MPD client

''Proposed mentor: Thomas Guillem''


== Improve the web interface of VLC in Vue.js ==

The idea is to improve the new web interface of VLC, that is currently in '''Vue.JS'''. It requires significant improvements

* Review the current code
* Clean and improve the modularity
* Adapt to the new playlist code
* Connect to the new medialibrary
* Improve the look

Those will be done in '''JS''' and '''C++''', and it requires familiarity with the Vue.JS framework
''Proposed mentor: David''

== Improve VLCKit Objective-C - Swift interoperability == 

'''Project description''':

Currently VLCKit is not very '''Swift''' friendly.
Indeed, it will be beneficial for VLCKit to have a better '''Swift''' interoperability interface than one generated by default.

'''Tasks to do''':

* Study exposed VLCKit methods
* Improve Objective-C - Swift interop
* Make a test Swift project to test the interoperability

'''Requirements''': This project requires '''Objective-C''' and '''Swift''' knowledge.

'''Proposed mentor''': Felix Paul Kühne, Soomin Lee

== Other ideas for VLC & libVLC ==

Those ideas are not detailed, but they are ideas that we could help to spring new ideas.
We can help work with you to make those more detailed.

* Integrate '''Rust''' inside VLC, as a demuxer or a parser
* Improve Vulkan output for VLC, including HDR support
* Improve id3 tag and metadata handling in VLC
* Bridge module for GMI'C or other video filters
* Automated Testing Environment like ffmpeg Fate (port ?) for demuxing, non-hw decoding
* Integrate libavfilter in VLC
* Improve the libVLCSharp bindings for VLC in '''C#'''
* Provide setups for popular streaming services / sout templates (ui ?)

= Ideas for VideoLAN infrastructure =

== Improve the VideoLAN crash reporter in Go and Vue.js ==

The idea is to improve the current crash reporter of VLC, called [https://code.videolan.org/videolan/CrashDragon CrashDragon].

The tasks are the following:
* Review the current code
* Improve the API in Go
* Write a new Vue.js frontend

Those will be done in '''Go''' and '''JS'''

''Proposed mentor: David and j-b''

= Ideas for VLMC =

== Port to Android ==

'''Project Description''': 
VLMC is now working on the desktop. It would be nice to port it also to the mobile world, starting by Android.

This project would require to adapt to smaller screens, and simplify the UI to fit the Android workflow.

'''Tasks to do''':
# Fix the VLMC build for Android. As libVLC works fine on Android, this is more focused on compiling the Qt part for Android.
# Split more parts of the UI in components that are reusable on mobile.
# Change the components to fit the small resolutions of the Android devices.
# Rewrite some UI components in QML.
# Write a simpler timeline widget for Mobile workflows.

'''Requirements''': This project requires '''C++/Qt/qml''' knowledge, and access to Android devices.

''Proposed mentors: Geoffrey/Hugo''


== Port to iOS ==

'''Project Description''': 
VLMC is now working on the desktop. It would be nice to port it also to the mobile world, also on iOS.

This project would require to adapt to smaller screens, and simplify the UI to fit the iOS workflow.

'''Tasks to do''':
# Fix the VLMC build for iOS. As libVLC works fine on iOS, this is more focused on compiling the Qt part for iOS.
# Split more parts of the UI in components that are reusable on mobile.
# Change the components to fit the small resolutions of the iOS devices.
# Rewrite some UI components in QML.
# Write a simpler timeline widget for Mobile workflows.

'''Requirements''': This project requires '''C++/Qt/qml''' knowledge, and access to iOS devices. Previous iOS development experience is preferred.

''Proposed mentors: Felix/Hugo''


== Media Workflow rework ==

'''Project Description''':
VLMC is now working on the desktop, but the media workflow is quite slow and is missing some common use cases.

This should be fixed in [https://github.com/mltframework/mlt MLT] framework backend for libVLC and is the continuation from the work from the previous Summer of Code.

'''Tasks to do''':
# Understand the MLT libVLC backend codebase,
# Clean the backend and port it to a cleaner code state in C++,
# Benchmark the code and make it more efficient,
# Work to merge this backend upstream,
# Implement all the missing features in libVLC.

'''Requirements''': This project requires '''C/C++''' knowledge, and understanding of multimedia concepts is a good positive point.

''Proposed mentors: Hugo''


== Workflow audio filters ==

'''Project Description''':
VLMC is now working on the desktop, but we need to have a good setup of audio filters to make it usable for most people.

'''Tasks to do''':
# Understand the VLMC and MLT codebase interactions,
# Add audio filters on the MLT framework backend using the [https://en.wikipedia.org/wiki/LADSPA LADSPA]/[http://lv2plug.in/ LV2] library or a similar open source library,
# Code the interface corresponding to those filters, and their options,
# Prepare visualizations, and notably for soundwave filters,
# Integrate those inside the timeline UI,
# Optimize.

'''Requirements''': This project requires '''C++/Qt/qml''' knowledge, and enough understanding of audio.

''Proposed mentors: J-B''


== Workflow video filters ==

'''Project Description''':
VLMC is now working on the desktop, but we need to have a good setup of video filters to make it usable for most people.

'''Tasks to do''':
# Understand the VLMC and MLT codebase interactions,
# Add video filters on the MLT framework backend using the [https://git.sesse.net/?p=movit;a=summary movit] library or a similar open source library,
# Code the interface corresponding to those filters, and their options,
# Add transitions between clips
# Code the interface to manage those transitions,
# Optimize the code.

'''Requirements''': This project requires '''C/C++''' knowledge.

''Proposed mentors: Felix''


== Improve multiplatform support ==
VLMC is aiming at being fully cross platform, but drifted a bit from that goal. While most VLMC's code is cross platform, and can be easily built targeting platforms, some dependencies might prove more difficult to build or compose with VLMC.

'''Tasks to do''':
# Fix MLT cross compilation for Windows (This will most likely require patching directly inside MLT, all contributions must be sent upstream). 
# Fix medialibrary code & build process on macOS (and potentially iOS). The medialibrary misses some platform specific code to be able to list all connected drives (hard drives & USB removable storage, mostly) along with filesystem browsing
# Update the documentation along the way
# Create jenkins build configuration to have nightly builds on jenkins.videolan.org & nightlies.videolan.org for all supported platforms

'''Requirements''': This project requires buildsystems/toolchains knowledge, basic system programming on macOS & Windows

''Proposed mentors: Hugo''

== Remote UI ==

We would like to have a way to use VLMC from a web browser. You can easily imagine having a nice, shiny & simple UI for minimal movie edition, which would go hand in hand with the cloud storage feature.

'''Tasks to do''':
This task aims toward the uncoupling of the rendering backend & UI, as the renderer will run server side, while the UI runs on the client side.

The idea is to be able to have a UI interacting with the renderer without having to be in the same process, or even machine.

'''Requirements''': This project requires '''C++''' and '''JS''' knowledge.

''Proposed mentor'': jb, chouquette, fkuehne


= Ideas for dav1d =

== dav1d ARM NEON optimization ==

Improving the performance of the AV1 decoder is very important for VLC and the whole ecosystem.

It requires to:
* Profiling to identify hotspots of the new libdav1d video decoder on arm64 across common test files
* Analysis of potential benefits of NEON SIMD for these hotspots
* Write arm64 NEON optimization using directly written assembly code

'''Requirements''': This project requires '''C''' and '''ASM''' knowledge, as well as system programming skills

Contact 'j-b'

== dav1d SSE2/AVX optimizations ==

Improving the performance of the AV1 decoder is very important for VLC and the whole ecosystem.

It requires to:
* Understanding the SSSE3 code of dav1d
* Port it to SSE2
* Write AVX-512 optimizations

'''Requirements''': This project requires '''C''' and '''ASM''' knowledge, as well as system programming skills

Contact 'j-b'

== dav1d GPU Compute Shaders ==

Improving the performance of the AV1 decoder is very important for VLC and the whole ecosystem.

This project requires to port one of the filter, like SGR or Wiener to one of the Shader languages. iPhones or Xbox One would be a good target.

This is a tricky project, but is doable during the summer

'''Requirements''': This project requires '''C''' and '''GPU Shaders''' knowledge, as well as system programming skills

Contact 'j-b'

== dav1d Threading improvements ==

Improving the performance of the AV1 decoder is very important for VLC and the whole ecosystem.

This project aims to:
- improve the threading of AV1, notably to separate the threads for the filters
- provide an external threadpool for multiple players
- provide a good auto-setup of threads counts, after benchmarking.

This is a tricky project, but is doable during the summer

'''Requirements''': This project requires '''C''' and '''threading''' knowledge, as well as system programming skills

Contact 'j-b'

== dav1d statistics extractions ==

The [https://code.videolan.org/videolan/dav1d dav1d] AV1 decoder is a new high performance AV1 decoder by 
VideoLAN.

Current open source tools for AV1 analysis use instrumentation in the reference decoder [https://aomedia.googlesource.com/aom libaom] to extract decode-time metadata for display and reporting, but support for sophisticated analysis is lacking.

To speed development of AV1 tools like the rav1e, it would be helpful to add similar decoder metadata extraction APIs to the dav1d decoder so that rapid testing of encoder algorithms is easier.  This includes the ability to quickly produce statistics, visualizations and other 
reporting that can be used for tuning encoder parameters or guiding development.  Advanced ideas include adding similar encoder metadata API to rav1e that add encode-time visualizations.

'''Requirements''': This project requires '''C''' knowledge.

Contact 'unlord'

= Ideas for VLC dependencies =

== libmicrodns refactoring ==

Our current mDNS discoverer is working, but is not so respectful of the RFC.
Possible improvements include:
* Device TTL support
* Device removal detection
* Better request pacing
* Delegate socket interactions to the caller
* Unit testing
* Fuzzing

'''Requirements''': This project require '''C''' knowledge, as well as system programming skills

''Proposed mentor'': chouquette, tguillem


== rav1e, the AV1 encoder in Rust ==

The [https://github.com/xiph/rav1e rav1e] project aims to create a new AV1 encoder implementation in 
Rust.

To support this we need better AV1 analysis tools that give detailed information about AV1 streams including:

* bit rate across the frame
* frame allocation within a scene
* display of frame data (block partitioning, mode decisions, motion vectors, etc)
* objective quality over time
* average rate (for streaming)

'''Requirements''': This project requires '''Rust''' knowledge.

Contact 'unlord'


{{GSoC}}
[[Category:SoC]]