linux/drivers/media/platform/chips-media/coda/coda-mpeg4.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Coda multi-standard codec IP - MPEG-4 helper functions
 *
 * Copyright (C) 2019 Pengutronix, Philipp Zabel
 */

#include <linux/kernel.h>
#include <linux/videodev2.h>

#include "coda.h"

int coda_mpeg4_profile(int profile_idc)
{ … }

int coda_mpeg4_level(int level_idc)
{ … }

/*
 * Check if the buffer starts with the MPEG-4 visual object sequence and visual
 * object headers, for example:
 *
 *   00 00 01 b0 f1
 *   00 00 01 b5 a9 13 00 00 01 00 00 00 01 20 08
 *               d4 8d 88 00 f5 04 04 08 14 30 3f
 *
 * Returns the detected header size in bytes or 0.
 */
u32 coda_mpeg4_parse_headers(struct coda_ctx *ctx, u8 *buf, u32 size)
{ … }