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https://github.com/FFmpeg/FFmpeg.git
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75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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* EVC helper functions for muxers
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* Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_EVC_H
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#define AVFORMAT_EVC_H
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#include <stdint.h>
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#include "libavutil/rational.h"
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#include "libavcodec/evc.h"
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#include "avio.h"
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static inline int evc_get_nalu_type(const uint8_t *bits, int bits_size)
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{
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int unit_type_plus1 = 0;
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if (bits_size >= EVC_NALU_HEADER_SIZE) {
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unsigned char *p = (unsigned char *)bits;
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// forbidden_zero_bit
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if ((p[0] & 0x80) != 0) // Cannot get bitstream information. Malformed bitstream.
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return -1;
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// nal_unit_type
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unit_type_plus1 = (p[0] >> 1) & 0x3F;
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}
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return unit_type_plus1 - 1;
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}
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static inline uint32_t evc_read_nal_unit_length(const uint8_t *bits, int bits_size)
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{
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uint32_t nalu_len = 0;
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if (bits_size >= EVC_NALU_LENGTH_PREFIX_SIZE) {
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unsigned char *p = (unsigned char *)bits;
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for (int i = 0; i < EVC_NALU_LENGTH_PREFIX_SIZE; i++)
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nalu_len = (nalu_len << 8) | p[i];
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}
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return nalu_len;
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}
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/**
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* Writes EVC sample metadata to the provided AVIOContext.
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*
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* @param pb pointer to the AVIOContext where the evc sample metadata shall be written
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* @param buf input data buffer
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* @param size size in bytes of the input data buffer
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* @param ps_array_completeness @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
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*
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* @return 0 in case of success, a negative error code in case of failure
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*/
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int ff_isom_write_evcc(AVIOContext *pb, const uint8_t *data,
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int size, int ps_array_completeness);
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#endif // AVFORMAT_EVC_H
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