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Andreas RheinhardtandJames Almer
447a07fc12
It is (arguably) a slightly better place for them and avoids a forward declaration of enum AVExifHeaderMode which is not possible in ISO C before C23 (and requires specifying the underlying type with C23). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
95 lines
3.8 KiB
C
95 lines
3.8 KiB
C
/*
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* EXIF metadata parser - internal functions
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* Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de>
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* Copyright (c) 2024-2025 Leo Izen <leo.izen@gmail.com>
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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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/**
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* @file
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* EXIF metadata parser - internal functions
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* @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
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* @author Leo Izen <leo.izen@gmail.com>
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*/
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#ifndef AVCODEC_EXIF_INTERNAL_H
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#define AVCODEC_EXIF_INTERNAL_H
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#include "libavutil/buffer.h"
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#include "libavutil/frame.h"
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#include "exif.h"
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#include "version_major.h"
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#if LIBAVCODEC_VERSION_MAJOR < 63
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/* Used by the AVI demuxer */
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int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size,
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int le, int depth, AVDictionary **metadata);
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#endif
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/**
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* Compares values in the IFD with data in the provided AVFrame and sets the values
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* in that IFD to match the ones in that AVFrame. This is mostly useful for an
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* encoder that wishes to use ff_exif_get_buffer, but would prefer to modify the
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* IFD after it is sanitized and call av_exif_write afterward.
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*/
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int ff_exif_sanitize_ifd(void *logctx, const AVFrame *frame, AVExifMetadata *ifd);
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/**
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* Gets all relevant side data, collects it into an IFD, and writes it into the
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* corresponding buffer pointer. This includes both AV_FRAME_DATA_EXIF and other
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* side data types that are included in the frame data, such as possibly an
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* instance of AV_FRAME_DATA_DISPLAYMATRIX. It also sets width and height tags
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* to match those of the AVFrame if they are different.
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* The *buffer argument must be NULL before calling.
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*
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* On success, a positive number is returned, and the buffer becomes owned by the caller.
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* A negative AVERROR return value means that an error occurred.
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* A zero return value means that there was no EXIF data to write.
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* In both the negative and zero cases, *buffer will be NULL.
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*/
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int ff_exif_get_buffer(void *logctx, const AVFrame *frame, AVBufferRef **buffer, enum AVExifHeaderMode header_mode);
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struct AVCodecContext;
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/**
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* Attach the data buffer to the frame. This is mostly a wrapper for
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* av_side_data_new_from_buffer, but it checks if the orientation tag is
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* present in the provided EXIF buffer. If it is, it zeroes it out and
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* attaches that information as an AV_FRAME_DATA_DISPLAYMATRIX instead
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* of including it in the AV_FRAME_DATA_EXIF side data buffer.
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*
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* *buf is ALWAYS consumed by this function and NULL written in its place, even
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* on failure.
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*/
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int ff_decode_exif_attach_buffer(struct AVCodecContext *avctx, AVFrame *frame, AVBufferRef **buf,
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enum AVExifHeaderMode header_mode);
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/**
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* Attach an already-parsed EXIF metadata struct to the frame as a side data
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* buffer. It writes the EXIF IFD into the buffer and attaches the buffer to
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* the frame.
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*
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* If the metadata struct contains an orientation tag, it will be zeroed before
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* writing, and instead, an AV_FRAME_DATA_DISPLAYMATRIX will be attached in
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* addition to the AV_FRAME_DATA_EXIF side data.
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*/
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int ff_decode_exif_attach_ifd(struct AVCodecContext *avctx, AVFrame *frame,
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const struct AVExifMetadata *ifd);
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#endif /* AVCODEC_EXIF_INTERNAL_H */
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