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CONTRIBUTING.md

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Contributing to Anja

Thank you for your interest in making Anja the most useful live sample player ever. Before continuing, take your time to read through these guidelines on how to proceed.

Reporting bugs

Most software contains bugs, and this is likely to be true for Anja as well. If you find any bug you can currently post an issue to the GitHub issue tracker [1]. When posting a bug record, include the following information:

  1. The exact procedure to reproduce the bad behaviour

  2. The session file used, together with all waveform files. This may require some online file sharing service.

  3. Your hardware specification. Do you have AVX or not? How much RAM do you have?

  4. If you experience strange look and feel, state what GTK+3 theme you are using.

Finally, if there was a crash, deadlock, or CPU spinning. Run anja with the debug option

anja --debug [options]

This will launch the debugger. Start anja by typing

catch throw
run

If the program crashed, type backtrace, and add the information retrieved to the bug report. In the two other cases, press Ctrl+C when it hangs, and then type backtrace. Add the retrieved information to the bug report.

Feature requests

Anja has been written to satisfy the needs of the developer. As the developer has not seen the entire world, you may need a feature that the developer has not though of. Feature requests can also be posted to the GitHub issue tracker [1]. A feature request should include

  1. A short description of the missing feature

  2. What it is good for

  3. Some kind of UI concept such as how to access it and how to set parameters

Any feature within the scope of "playing sound effects" can be requested. However, they will only be implemented if it can be done within lowlatency realtime constraints. This means that a feature request that says "add PulseAudio support" will be rejected unless PulseAudio gets a better realtime behaviour, but it is fine to suggest a seamingly more radical change that the UI should be ported to another API such as modern versions of Qt, the classic GTK+-2.0 or the upcoming GTK+-4.0.

Code contributions

As Anja is free software, you are welcome to improve Anja and make a pull request. To do so

  1. Fork the project

  2. Clone your fork

  3. Compile it

  4. Do your changes

  5. Test it

  6. Push your fork

  7. Make a pull request

Before doing anything, you will probably benefit from reading the source code overview in the manual [2]. In addition to that text, here are some coding practices that are followed withinthis project. Items are not mentioned in any particular order.

  • Declare each variable separately

    Good:

    float foo;
float bar;

    OK:

    float foo; float bar;

    Bad:

    float foo, bar;

  • Do not use any naked resource allocating function or operator

  • Follow "rule of the zero", or "rule of the five"

  • If you find and correct a bug, and correct it, add more comments to the location in the code where the bug appeared. Since there was a bug, it is likely that this part of the code was harder to understand.

  • Make constructors explicit

  • Prefer ISO C or C++ function over system specific functions, but be careful with C99 functions, as it is possible that C99 is not supported out-of-the-box everywhere (MinGW links to the old MSVCRT which is C89 only + Microsoft specific extensions [3]).

  • Remember when you are in a realtime context. When you hacking on a function that is called from a realtime context, it must not call malloc/free or any blocking function. Also, minimize the use of trancendental functions, and rational powers.

  • Use immutable state if and only if keeping the object would not be cheaper in terms of asymptotic complexity

  • Use long if and only if a function from an external library uses it. If you want a pointer-sized integer, user intptr_t or size_t. If it is another integer you should use int or, if larger range is required, long long.

  • Use tabs for indentation, except in markdown files

  • Surround every block with braces

    Good:

    if(foo)
    {doStuff();}

    Bad:

    if(foo)
    doStuff();

[1] https://milasudril.github.io/anja#srcview

[2] https://github.com/milasudril/anja/issues

[3] http://www.mingw.org/wiki/c99