/* * EVC helper functions for muxers * Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVFORMAT_EVC_H#define AVFORMAT_EVC_H #include <stdint.h> #include "libavutil/intreadwrite.h"#include "libavutil/rational.h"#include "libavcodec/evc.h"#include "avio.h" static inline int evc_get_nalu_type(const uint8_t *p, int bits_size){    int unit_type_plus1 = 0;     if (bits_size >= EVC_NALU_HEADER_SIZE) {        // forbidden_zero_bit        if ((p[0] & 0x80) != 0)   // Cannot get bitstream information. Malformed bitstream.            return -1;         // nal_unit_type        unit_type_plus1 = (p[0] >> 1) & 0x3F;    }     return unit_type_plus1 - 1;} static inline uint32_t evc_read_nal_unit_length(const uint8_t *bits, int bits_size){    if (bits_size >= EVC_NALU_LENGTH_PREFIX_SIZE)        return AV_RB32(bits);     return 0;} /** * Writes EVC sample metadata to the provided AVIOContext. * * @param pb pointer to the AVIOContext where the evc sample metadata shall be written * @param buf input data buffer * @param size size in bytes of the input data buffer * @param ps_array_completeness @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3 * * @return 0 in case of success, a negative error code in case of failure */int ff_isom_write_evcc(AVIOContext *pb, const uint8_t *data,                       int size, int ps_array_completeness); #endif // AVFORMAT_EVC_H