88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Coda multi-standard codec IP - MPEG-4 helper functions
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*
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* Copyright (C) 2019 Pengutronix, Philipp Zabel
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*/
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#include <linux/kernel.h>
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#include <linux/videodev2.h>
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#include "coda.h"
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int coda_mpeg4_profile(int profile_idc)
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{
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switch (profile_idc) {
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case 0:
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return V4L2_MPEG_VIDEO_MPEG4_PROFILE_SIMPLE;
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case 15:
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return V4L2_MPEG_VIDEO_MPEG4_PROFILE_ADVANCED_SIMPLE;
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case 2:
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return V4L2_MPEG_VIDEO_MPEG4_PROFILE_CORE;
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case 1:
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return V4L2_MPEG_VIDEO_MPEG4_PROFILE_SIMPLE_SCALABLE;
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case 11:
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return V4L2_MPEG_VIDEO_MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY;
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default:
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return -EINVAL;
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}
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}
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int coda_mpeg4_level(int level_idc)
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{
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switch (level_idc) {
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case 0:
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return V4L2_MPEG_VIDEO_MPEG4_LEVEL_0;
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case 1:
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return V4L2_MPEG_VIDEO_MPEG4_LEVEL_1;
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case 2:
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return V4L2_MPEG_VIDEO_MPEG4_LEVEL_2;
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case 3:
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return V4L2_MPEG_VIDEO_MPEG4_LEVEL_3;
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case 4:
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return V4L2_MPEG_VIDEO_MPEG4_LEVEL_4;
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case 5:
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return V4L2_MPEG_VIDEO_MPEG4_LEVEL_5;
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default:
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return -EINVAL;
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}
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}
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/*
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* Check if the buffer starts with the MPEG-4 visual object sequence and visual
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* object headers, for example:
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*
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* 00 00 01 b0 f1
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* 00 00 01 b5 a9 13 00 00 01 00 00 00 01 20 08
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* d4 8d 88 00 f5 04 04 08 14 30 3f
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*
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* Returns the detected header size in bytes or 0.
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*/
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u32 coda_mpeg4_parse_headers(struct coda_ctx *ctx, u8 *buf, u32 size)
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{
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static const u8 vos_start[4] = { 0x00, 0x00, 0x01, 0xb0 };
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static const union {
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u8 vo_start[4];
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u8 start_code_prefix[3];
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} u = { { 0x00, 0x00, 0x01, 0xb5 } };
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if (size < 30 ||
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memcmp(buf, vos_start, 4) != 0 ||
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memcmp(buf + 5, u.vo_start, 4) != 0)
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return 0;
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if (size == 30 ||
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(size >= 33 && memcmp(buf + 30, u.start_code_prefix, 3) == 0))
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return 30;
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if (size == 31 ||
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(size >= 34 && memcmp(buf + 31, u.start_code_prefix, 3) == 0))
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return 31;
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if (size == 32 ||
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(size >= 35 && memcmp(buf + 32, u.start_code_prefix, 3) == 0))
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return 32;
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return 0;
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}
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