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74 lines
2.4 KiB
74 lines
2.4 KiB
/* |
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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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