Function av_fifo_peek

pub unsafe extern "C" fn av_fifo_peek(
    f: *const AVFifo,
    buf: *mut c_void,
    nb_elems: usize,
    offset: usize,
) -> i32

Read data from a FIFO without modifying FIFO state.

Returns an error if an attempt is made to peek to nonexistent elements (i.e. if offset + nb_elems is larger than av_fifo_can_read(f)).

@param f the FIFO buffer @param buf Buffer to store the data. nb_elems * av_fifo_elem_size(f) bytes will be written into buf. @param nb_elems number of elements to read from FIFO @param offset number of initial elements to skip.

@return a non-negative number on success, a negative error code on failure