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https://github.com/librempeg/librempeg
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98ec4261fd
Add a parameter to omit seq header when generating the av1C atom. For now, this does not change any behavior. This will be used by a follow-up patch to add AVIF support. Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/*
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* AV1 helper functions for muxers
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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_AV1_H
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#define AVFORMAT_AV1_H
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#include <stdint.h>
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#include "avio.h"
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typedef struct AV1SequenceParameters {
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uint8_t profile;
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uint8_t level;
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uint8_t tier;
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uint8_t bitdepth;
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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 color_description_present_flag;
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uint8_t color_primaries;
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uint8_t transfer_characteristics;
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uint8_t matrix_coefficients;
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uint8_t color_range;
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} AV1SequenceParameters;
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/**
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* Filter out AV1 OBUs not meant to be present in ISOBMFF sample data and write
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* the resulting bitstream to the provided AVIOContext.
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*
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* @param pb pointer to the AVIOContext where the filtered bitstream shall be
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* written; may be NULL, in which case nothing is written.
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* @param buf input data buffer
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* @param size size of the input data buffer
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*
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* @return the amount of bytes written (or would have been written in case
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* pb had been supplied) in case of success, a negative AVERROR
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* code in case of failure
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* @note One can use NULL for pb to just get the output size.
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*/
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int ff_av1_filter_obus(AVIOContext *pb, const uint8_t *buf, int size);
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/**
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* Filter out AV1 OBUs not meant to be present in ISOBMFF sample data and return
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* the result in a data buffer, avoiding allocations and copies if possible.
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*
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* @param in input data buffer
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* @param out pointer to pointer for the returned buffer. In case of success,
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* it is independently allocated if and only if `*out` differs from in.
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* @param size size of the input data buffer. The size of the resulting output
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* data buffer will be written here
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* @param offset offset of the returned data inside `*out`: It runs from
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* `*out + offset` (inclusive) to `*out + offset + size`
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* (exclusive); is zero if `*out` is independently allocated.
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*
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* @return 0 in case of success, a negative AVERROR code in case of failure.
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* On failure, *out and *size are unchanged
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* @note *out will be treated as unintialized on input and will not be freed.
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*/
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int ff_av1_filter_obus_buf(const uint8_t *in, uint8_t **out,
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int *size, int *offset);
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/**
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* Parses a Sequence Header from the the provided buffer.
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*
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* @param seq pointer to the AV1SequenceParameters where the parsed values will
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* 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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*
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* @return >= 0 in case of success, a negative AVERROR code in case of failure
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*/
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int ff_av1_parse_seq_header(AV1SequenceParameters *seq, const uint8_t *buf, int size);
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/**
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* Writes AV1 extradata (Sequence Header and Metadata OBUs) to the provided
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* AVIOContext.
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*
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* @param pb pointer to the AVIOContext where the av1C box 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 write_seq_header If 1, Sequence Header OBU will be written inside the
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* av1C box. Otherwise, Sequence Header OBU will be omitted.
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*
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* @return >= 0 in case of success, a negative AVERROR code in case of failure
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*/
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int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size, int write_seq_header);
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#endif /* AVFORMAT_AV1_H */
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