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