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/*
* Coda multi-standard codec IP - H.264 helper functions
*
* Copyright (C) 2012 Vista Silicon S.L.
* Javier Martin, <javier.martin@vista-silicon.com>
* Xavier Duret
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <coda.h>
static const u8 coda_filler_size[8] = { 0, 7, 14, 13, 12, 11, 10, 9 };
int coda_h264_filler_nal(int size, char *p)
{
if (size < 6)
return -EINVAL;
p[0] = 0x00;
p[1] = 0x00;
p[2] = 0x00;
p[3] = 0x01;
p[4] = 0x0c;
memset(p + 5, 0xff, size - 6);
/* Add rbsp stop bit and trailing at the end */
p[size - 1] = 0x80;
return 0;
}
int coda_h264_padding(int size, char *p)
{
int nal_size;
int diff;
diff = size - (size & ~0x7);
if (diff == 0)
return 0;
nal_size = coda_filler_size[diff];
coda_h264_filler_nal(nal_size, p);
return nal_size;
}
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