ffmpeg_sys::av_expr_parse_and_eval

pub unsafe extern fn av_expr_parse_and_eval(res: *mut c_double, s: *const c_char, const_names: *const *const c_char, const_values: *const c_double, func1_names: *const *const c_char, funcs1: *const extern fn(*mut c_void, c_double) -> c_double, func2_names: *const *const c_char, funcs2: *const extern fn(*mut c_void, c_double, c_double) -> c_double, opaque: *mut c_void, log_offset: c_int, log_ctx: *mut c_void) -> c_int