Function stainless_ffmpeg_sys::av_expr_parse_and_eval

pub unsafe extern "C" fn av_expr_parse_and_eval(
    res: *mut f64, 
    s: *const c_char, 
    const_names: *const *const c_char, 
    const_values: *const f64, 
    func1_names: *const *const c_char, 
    funcs1: *const Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: f64) -> f64>, 
    func2_names: *const *const c_char, 
    funcs2: *const Option<unsafe extern "C" fn(arg1: *mut c_void, arg2: f64, arg3: f64) -> f64>, 
    opaque: *mut c_void, 
    log_offset: c_int, 
    log_ctx: *mut c_void
) -> c_int

Parse and evaluate an expression. Note, this is significantly slower than av_expr_eval().

@param res a pointer to a double where is put the result value of the expression, or NAN in case of error @param s expression as a zero terminated string, for example "1+2^3+5*5+sin(2/3)" @param const_names NULL terminated array of zero terminated strings of constant identifiers, for example {"PI", "E", 0} @param const_values a zero terminated array of values for the identifiers from const_names @param func1_names NULL terminated array of zero terminated strings of funcs1 identifiers @param funcs1 NULL terminated array of function pointers for functions which take 1 argument @param func2_names NULL terminated array of zero terminated strings of funcs2 identifiers @param funcs2 NULL terminated array of function pointers for functions which take 2 arguments @param opaque a pointer which will be passed to all functions from funcs1 and funcs2 @param log_ctx parent logging context @return >= 0 in case of success, a negative value corresponding to an AVERROR code otherwise