如何在 C# 中调用

Question

public unsafe struct AVContext
{
   public AVFormatContext* AVFC;
   public AVCodec* videoCodec;
}
    
AVContext *decoder = (AVContext*) calloc(1, sizeof(AVContext));
      

How can i initiate a new struct like this in c#? Is there a calloc function in c#? Thanks in advance!

Answer 1

Yes, though it's not what you want. You have NativeMemory.AllocZeroed for newer.Net versions, and Marshal.AllocHGlobal for older ones.

But again, not what you want. Ffmpeg does its own allocating with its own methods. It also has its own memory free functions. Here's a quick example of how to initialize the format context, for example:

fixed (AVFormatContext** pFormatContext = &formatContext)
    CheckAvSuccess(ffmpeg.avformat_open_input(pFormatContext, path, null, null));