| /* | |
| * EVC helper functions for muxers | |
| * Copyright (c) 2022 Dawid Kozinski <[email protected]> | |
| * | |
| * 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 | |
| */ | |
| 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); | |