1/*
2 * Coda multi-standard codec IP - H.264 helper functions
3 *
4 * Copyright (C) 2012 Vista Silicon S.L.
5 *    Javier Martin, <javier.martin@vista-silicon.com>
6 *    Xavier Duret
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/kernel.h>
15#include <linux/string.h>
16
17static const u8 coda_filler_nal[14] = { 0x00, 0x00, 0x00, 0x01, 0x0c, 0xff,
18			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 };
19static const u8 coda_filler_size[8] = { 0, 7, 14, 13, 12, 11, 10, 9 };
20
21int coda_h264_padding(int size, char *p)
22{
23	int nal_size;
24	int diff;
25
26	diff = size - (size & ~0x7);
27	if (diff == 0)
28		return 0;
29
30	nal_size = coda_filler_size[diff];
31	memcpy(p, coda_filler_nal, nal_size);
32
33	/* Add rbsp stop bit and trailing at the end */
34	*(p + nal_size - 1) = 0x80;
35
36	return nal_size;
37}
38