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exif.h
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exif.h
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/**
* exif.h - Functions to generate Exif metadata
*
* Copyright (c) 2019, David Imhoff <dimhoff.devel@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the author nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __EXIF_H__
#define __EXIF_H__
#include <stdint.h>
#include <stddef.h>
#include "esp_camera.h"
#include "configuration.h"
#ifdef WITH_GNSS
# include <MicroNMEA.h>
#endif
/**
* Update the configurable EXIF header fields
*
* Update all field in the EXIF header that depend on the configuration. Needs
* to be called every time the configuration is changed.
*
* @returns True on success, else false
*/
bool update_exif_from_cfg(const Configuration &c);
#ifdef WITH_GNSS
/**
* Update GPS data in EXIF header
*
* Should be called for every call to get_exif_header() if GNSS support is enabled.
*/
void update_exif_gps(const MicroNMEA& nmea);
#endif // WITH_GNSS
/**
* Get Exif header
*
* Get a buffer with a new Exif header that can be prepended to a JPEG image.
* The JPEG does need to be stripped from its original header first, see
* get_jpeg_data_offset().
*
* The returned pointer point so a static buffer, and should not be altered.
* This function is not reentrant safe.
*
* @param fb Frame buffer of captured image. Encoding is expected to
* be JPEG
* @param exif_buf If not NULL, used to return pointer to Exif buffer in
* @param exif_buf Used to return the size of the Exif buffer
*
* @returns Pointer to Exif buffer, or NULL on error
*/
const uint8_t *get_exif_header(camera_fb_t *fb, const uint8_t **exif_buf, size_t *exif_len);
/**
* Get offset of first none header byte in buffer
*
* Get the offset of the first none JPEG header byte in capture buffer. This
* can be used to strip the JPEG SOI and JFIF headers from an image.
*
* @returns offset of first non header byte, or 0 on error
*/
size_t get_jpeg_data_offset(camera_fb_t *fb);
#endif // __EXIF_H__