93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCORE_IMGUTILS_H
|
|
#define AVCORE_IMGUTILS_H
|
|
|
|
/**
|
|
* @file
|
|
* misc image utilities
|
|
*/
|
|
|
|
#include "libavutil/pixdesc.h"
|
|
#include "avcore.h"
|
|
|
|
/**
|
|
* Compute the max pixel step for each plane of an image with a
|
|
* format described by pixdesc.
|
|
*
|
|
* The pixel step is the distance in bytes between the first byte of
|
|
* the group of bytes which describe a pixel component and the first
|
|
* byte of the successive group in the same plane for the same
|
|
* component.
|
|
*
|
|
* @param max_pixsteps an array which is filled with the max pixel step
|
|
* for each plane. Since a plane may contain different pixel
|
|
* components, the computed max_pixsteps[plane] is relative to the
|
|
* component in the plane with the max pixel step.
|
|
* @param max_pixstep_comps an array which is filled with the component
|
|
* for each plane which has the max pixel step. May be NULL.
|
|
*/
|
|
void av_fill_image_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
|
|
const AVPixFmtDescriptor *pixdesc);
|
|
|
|
/**
|
|
* Compute the size of an image line with format pix_fmt and width
|
|
* width for the plane plane.
|
|
*
|
|
* @return the computed size in bytes
|
|
*/
|
|
int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane);
|
|
|
|
/**
|
|
* Fill plane linesizes for an image with pixel format pix_fmt and
|
|
* width width.
|
|
*
|
|
* @param linesizes array to be filled with the linesize for each plane
|
|
* @return >= 0 in case of success, a negative error code otherwise
|
|
*/
|
|
int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width);
|
|
|
|
/**
|
|
* Fill plane data pointers for an image with pixel format pix_fmt and
|
|
* height height.
|
|
*
|
|
* @param data pointers array to be filled with the pointer for each image plane
|
|
* @param ptr the pointer to a buffer which will contain the image
|
|
* @param linesizes[4] the array containing the linesize for each
|
|
* plane, should be filled by av_fill_image_linesizes()
|
|
* @return the size in bytes required for the image buffer, a negative
|
|
* error code in case of failure
|
|
*/
|
|
int av_fill_image_pointers(uint8_t *data[4], enum PixelFormat pix_fmt, int height,
|
|
uint8_t *ptr, const int linesizes[4]);
|
|
|
|
/**
|
|
* Check if the given dimension of an image is valid, meaning that all
|
|
* bytes of the image can be addressed with a signed int.
|
|
*
|
|
* @param w the width of the picture
|
|
* @param h the height of the picture
|
|
* @param log_offset the offset to sum to the log level for logging with log_ctx
|
|
* @param log_ctx the parent logging context, it may be NULL
|
|
* @return >= 0 if valid, a negative error code otherwise
|
|
*/
|
|
int av_check_image_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx);
|
|
|
|
#endif /* AVCORE_IMGUTILS_H */
|