| /* |
| * Copyright (c) 2018, Alliance for Open Media. All rights reserved. |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| #ifndef AOM_COMMON_AV1_CONFIG_H_ |
| #define AOM_COMMON_AV1_CONFIG_H_ |
| |
| #include "aom/aom_integer.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // Struct representing ISOBMFF/Matroska AV1 config. See: |
| // https://aomediacodec.github.io/av1-isobmff/#av1codecconfigurationbox-syntax |
| // |
| // The AV1 config has the following format: |
| // |
| // unsigned int (1) marker = 1; |
| // unsigned int (7) version = 1; |
| // unsigned int (3) seq_profile; |
| // unsigned int (5) seq_level_idx_0; |
| // unsigned int (1) seq_tier_0; |
| // unsigned int (1) high_bitdepth; |
| // unsigned int (1) twelve_bit; |
| // unsigned int (1) monochrome; |
| // unsigned int (1) chroma_subsampling_x; |
| // unsigned int (1) chroma_subsampling_y; |
| // unsigned int (2) chroma_sample_position; |
| // unsigned int (3) reserved = 0; |
| // |
| // unsigned int (1) initial_presentation_delay_present; |
| // if (initial_presentation_delay_present) { |
| // unsigned int (4) initial_presentation_delay_minus_one; |
| // } else { |
| // unsigned int (4) reserved = 0; |
| // } |
| // |
| // unsigned int (8)[] configOBUs; |
| // |
| // Note: get_av1config_from_obu() does not currently store 'configOBUs' data, so |
| // the field is omitted. |
| typedef struct _Av1Config { |
| uint8_t marker; |
| uint8_t version; |
| uint8_t seq_profile; |
| uint8_t seq_level_idx_0; |
| uint8_t seq_tier_0; |
| uint8_t high_bitdepth; |
| uint8_t twelve_bit; |
| uint8_t monochrome; |
| uint8_t chroma_subsampling_x; |
| uint8_t chroma_subsampling_y; |
| uint8_t chroma_sample_position; |
| uint8_t initial_presentation_delay_present; |
| uint8_t initial_presentation_delay_minus_one; |
| } Av1Config; |
| |
| // Attempts to parse a Sequence Header OBU and set the paramenters of 'config'. |
| // Returns 0 upon success, and -1 upon failure. 'buffer' can contain multiple |
| // OBUs, but the Sequence Header OBU must be the first OBU within the buffer. |
| int get_av1config_from_obu(const uint8_t *buffer, size_t length, int is_annexb, |
| Av1Config *config); |
| |
| // Attempts to parse an AV1 config from 'buffer'. Returns 0 upon success. |
| // Returns -1 when 'buffer_length' is less than 4, when passed NULL pointers, or |
| // when parsing of 'buffer' fails. |
| int read_av1config(const uint8_t *buffer, size_t buffer_length, |
| size_t *bytes_read, Av1Config *config); |
| |
| // Writes 'config' to 'buffer'. Returns 0 upon successful write to 'buffer'. |
| // Returns -1 when passed NULL pointers or when 'capacity' insufficient. |
| int write_av1config(const Av1Config *config, size_t capacity, |
| size_t *bytes_written, uint8_t *buffer); |
| |
| #ifdef __cplusplus |
| } /* extern "C" */ |
| #endif |
| |
| #endif // AOM_COMMON_AV1_CONFIG_H_ |