Function ffmpeg_dev::sys::avio_enum_protocols

pub unsafe extern "C" fn avio_enum_protocols(
    opaque: *mut *mut c_void, 
    output: c_int
) -> *const c_char

Iterate through names of available protocols.

@param opaque A private pointer representing current protocol. It must be a pointer to NULL on first iteration and will be updated by successive calls to avio_enum_protocols. @param output If set to 1, iterate over output protocols, otherwise over input protocols.

@return A static string containing the name of current protocol or NULL