Function av_fast_padded_malloc

pub unsafe extern "C" fn av_fast_padded_malloc(
    ptr: *mut c_void,
    size: *mut u32,
    min_size: usize,
)

Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.

In addition the whole buffer will initially and after resizes be 0-initialized so that no uninitialized data will ever appear.