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2899995a6f
ff_av1_filter_obus_buf() and ff_avc_parse_nal_units_buf() both have a pointer-to-pointer parameter which they use to pass a newly allocated buffer to the caller. And both functions freed what this pointer points to before overwriting it. But no caller of these functions used this feature, but some had to initialize the pointer just because of this. So remove it and update the documentation of ff_av1_filter_obus_buf() wrt this fact. ff_hevc_annexb2mp4_buf in contrast did not free the pointer. This has been documented, too. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
100 lines
3.4 KiB
C
100 lines
3.4 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
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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 in case of success, a negative AVERROR
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* code in case of failure
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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 write
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* the resulting bitstream to a newly allocated data buffer.
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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
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* @param in input data buffer
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* @param out pointer to pointer that will hold the allocated data buffer
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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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*
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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, int *size);
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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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*
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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);
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#endif /* AVFORMAT_AV1_H */
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