1 /* 2 * AV1 helper functions for muxers 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVFORMAT_AV1_H 22 #define AVFORMAT_AV1_H 23 24 #include <stdint.h> 25 26 #include "avio.h" 27 28 typedef struct AV1SequenceParameters { 29 uint8_t profile; 30 uint8_t level; 31 uint8_t tier; 32 uint8_t bitdepth; 33 uint8_t monochrome; 34 uint8_t chroma_subsampling_x; 35 uint8_t chroma_subsampling_y; 36 uint8_t chroma_sample_position; 37 uint8_t color_description_present_flag; 38 uint8_t color_primaries; 39 uint8_t transfer_characteristics; 40 uint8_t matrix_coefficients; 41 uint8_t color_range; 42 } AV1SequenceParameters; 43 44 /** 45 * Filter out AV1 OBUs not meant to be present in ISOBMFF sample data and write 46 * the resulting bitstream to the provided AVIOContext. 47 * 48 * @param pb pointer to the AVIOContext where the filtered bitstream shall be 49 * written 50 * @param buf input data buffer 51 * @param size size of the input data buffer 52 * 53 * @return the amount of bytes written in case of success, a negative AVERROR 54 * code in case of failure 55 */ 56 int ff_av1_filter_obus(AVIOContext *pb, const uint8_t *buf, int size); 57 58 /** 59 * Filter out AV1 OBUs not meant to be present in ISOBMFF sample data and return 60 * the result in a data buffer, avoiding allocations and copies if possible. 61 * 62 * @param in input data buffer 63 * @param out pointer to pointer for the returned buffer. In case of success, 64 * it is independently allocated if and only if `*out` differs from in. 65 * @param size size of the input data buffer. The size of the resulting output 66 * data buffer will be written here 67 * @param offset offset of the returned data inside `*out`: It runs from 68 * `*out + offset` (inclusive) to `*out + offset + size` 69 * (exclusive); is zero if `*out` is independently allocated. 70 * 71 * @return 0 in case of success, a negative AVERROR code in case of failure. 72 * On failure, *out and *size are unchanged 73 * @note *out will be treated as unintialized on input and will not be freed. 74 */ 75 int ff_av1_filter_obus_buf(const uint8_t *in, uint8_t **out, 76 int *size, int *offset); 77 78 /** 79 * Parses a Sequence Header from the the provided buffer. 80 * 81 * @param seq pointer to the AV1SequenceParameters where the parsed values will 82 * be written 83 * @param buf input data buffer 84 * @param size size in bytes of the input data buffer 85 * 86 * @return >= 0 in case of success, a negative AVERROR code in case of failure 87 */ 88 int ff_av1_parse_seq_header(AV1SequenceParameters *seq, const uint8_t *buf, int size); 89 90 /** 91 * Writes AV1 extradata (Sequence Header and Metadata OBUs) to the provided 92 * AVIOContext. 93 * 94 * @param pb pointer to the AVIOContext where the av1C box shall be written 95 * @param buf input data buffer 96 * @param size size in bytes of the input data buffer 97 * 98 * @return >= 0 in case of success, a negative AVERROR code in case of failure 99 */ 100 int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size); 101 102 #endif /* AVFORMAT_AV1_H */ 103