vapoursynth4_sys

Type Alias VSFrameDoneCallback

Source 
pub type VSFrameDoneCallback = unsafe extern "system-unwind" fn(userData: *mut c_void, f: *const VSFrame, n: c_int, node: *mut VSNode, errorMsg: *const c_char);
Expand description

Function of the client application called by the core when a requested frame is ready, after a call to getFrameAsync().

If multiple frames were requested, they can be returned in any order. Client applications must take care of reordering them.

This function is only ever called from one thread at a time.

getFrameAsync() may be called from this function to request more frames.

ยงArguments

  • userData - Pointer to private data from the client application, as passed previously to getFrameAsync().

  • f - Contains a reference to the generated frame, or NULL in case of failure. The ownership of the frame is transferred to the caller.

  • n - The frame number.

  • node - Node the frame belongs to.

  • errorMsg - String that usually contains an error message if the frame generation failed. NULL if there is no error.