AVIOInterruptCB code example

[niclasastrom]

Hi!

I'm struggling to set up an AVIOInterruptCB function, and I can't find a working example.
I use .NET6 and FFmpeg.Autogen 6.1

Can someone please share a working code example?

Kind regards,
Niclas

[Sophisticated-IS]

Hi, this one made by myself. But I still have problem of unsubscription and making nullable the callback pointer. Because for me it is does not work and delegate function is calling forever while there are IO operations until AvFormatContext is completely disposed(freed)/ I have not found any possibility how to free or reassign pointer to delegate so it won't be called any more.
Ofc, this not work context->interrupt_callback.callback.Pointer = IntPtr.Zero; Also if I free my delegate app just will crush with EngineExecutionError.

Simple Example:
Version 6.1.0.1

`public unsafe class InterruptingAvFormatContext : IDisposable
{
private readonly CancellationToken _token;
private GCHandle _gcHandle;

public InterruptingAvFormatContext(AVFormatContext* context, CancellationToken token)
{
    _token = token;

    AVIOInterruptCB_callback interruptDelegate = Interrupt_IO;
    _gcHandle = GCHandle.Alloc(interruptDelegate);

    context->interrupt_callback = new()
    {
        callback = interruptDelegate,
        opaque = null
    };
}

private int Interrupt_IO(void* opaque)
{
    return _token.IsCancellationRequested? 1:0;
}

public void Dispose()
{
    if (_gcHandle.IsAllocated)
    {
        _gcHandle.Free();    
    }
}

}`