278 lines
11 KiB
C
278 lines
11 KiB
C
/*
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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 AVUTIL_IMGUTILS_H
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#define AVUTIL_IMGUTILS_H
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/**
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* @file
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* misc image utilities
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*
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* @addtogroup lavu_picture
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* @{
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*/
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#include "avutil.h"
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#include "pixdesc.h"
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#include "rational.h"
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/**
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* Compute the max pixel step for each plane of an image with a
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* format described by pixdesc.
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*
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* The pixel step is the distance in bytes between the first byte of
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* the group of bytes which describe a pixel component and the first
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* byte of the successive group in the same plane for the same
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* component.
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*
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* @param max_pixsteps an array which is filled with the max pixel step
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* for each plane. Since a plane may contain different pixel
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* components, the computed max_pixsteps[plane] is relative to the
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* component in the plane with the max pixel step.
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* @param max_pixstep_comps an array which is filled with the component
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* for each plane which has the max pixel step. May be NULL.
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*/
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void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
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const AVPixFmtDescriptor *pixdesc);
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/**
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* Compute the size of an image line with format pix_fmt and width
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* width for the plane plane.
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*
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* @return the computed size in bytes
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*/
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int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane);
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/**
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* Fill plane linesizes for an image with pixel format pix_fmt and
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* width width.
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*
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* @param linesizes array to be filled with the linesize for each plane
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* @return >= 0 in case of success, a negative error code otherwise
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*/
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int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width);
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/**
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* Fill plane data pointers for an image with pixel format pix_fmt and
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* height height.
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*
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* @param data pointers array to be filled with the pointer for each image plane
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* @param ptr the pointer to a buffer which will contain the image
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* @param linesizes the array containing the linesize for each
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* plane, should be filled by av_image_fill_linesizes()
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* @return the size in bytes required for the image buffer, a negative
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* error code in case of failure
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*/
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int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
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uint8_t *ptr, const int linesizes[4]);
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/**
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* Allocate an image with size w and h and pixel format pix_fmt, and
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* fill pointers and linesizes accordingly.
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* The allocated image buffer has to be freed by using
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* av_freep(&pointers[0]).
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*
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* @param align the value to use for buffer size alignment
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* @return the size in bytes required for the image buffer, a negative
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* error code in case of failure
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*/
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int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
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int w, int h, enum AVPixelFormat pix_fmt, int align);
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/**
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* Copy image plane from src to dst.
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* That is, copy "height" number of lines of "bytewidth" bytes each.
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* The first byte of each successive line is separated by *_linesize
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* bytes.
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*
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* bytewidth must be contained by both absolute values of dst_linesize
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* and src_linesize, otherwise the function behavior is undefined.
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*
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* @param dst_linesize linesize for the image plane in dst
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* @param src_linesize linesize for the image plane in src
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*/
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void av_image_copy_plane(uint8_t *dst, int dst_linesize,
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const uint8_t *src, int src_linesize,
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int bytewidth, int height);
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/**
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* Copy image in src_data to dst_data.
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*
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* @param dst_linesizes linesizes for the image in dst_data
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* @param src_linesizes linesizes for the image in src_data
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*/
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void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
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const uint8_t *src_data[4], const int src_linesizes[4],
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enum AVPixelFormat pix_fmt, int width, int height);
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/**
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* Copy image data located in uncacheable (e.g. GPU mapped) memory. Where
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* available, this function will use special functionality for reading from such
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* memory, which may result in greatly improved performance compared to plain
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* av_image_copy().
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*
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* The data pointers and the linesizes must be aligned to the maximum required
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* by the CPU architecture.
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*
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* @note The linesize parameters have the type ptrdiff_t here, while they are
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* int for av_image_copy().
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* @note On x86, the linesizes currently need to be aligned to the cacheline
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* size (i.e. 64) to get improved performance.
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*/
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void av_image_copy_uc_from(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4],
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const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4],
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enum AVPixelFormat pix_fmt, int width, int height);
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/**
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* Setup the data pointers and linesizes based on the specified image
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* parameters and the provided array.
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*
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* The fields of the given image are filled in by using the src
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* address which points to the image data buffer. Depending on the
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* specified pixel format, one or multiple image data pointers and
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* line sizes will be set. If a planar format is specified, several
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* pointers will be set pointing to the different picture planes and
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* the line sizes of the different planes will be stored in the
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* lines_sizes array. Call with src == NULL to get the required
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* size for the src buffer.
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*
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* To allocate the buffer and fill in the dst_data and dst_linesize in
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* one call, use av_image_alloc().
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*
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* @param dst_data data pointers to be filled in
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* @param dst_linesize linesizes for the image in dst_data to be filled in
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* @param src buffer which will contain or contains the actual image data, can be NULL
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* @param pix_fmt the pixel format of the image
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* @param width the width of the image in pixels
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* @param height the height of the image in pixels
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* @param align the value used in src for linesize alignment
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* @return the size in bytes required for src, a negative error code
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* in case of failure
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*/
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int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
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const uint8_t *src,
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enum AVPixelFormat pix_fmt, int width, int height, int align);
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/**
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* Return the size in bytes of the amount of data required to store an
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* image with the given parameters.
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*
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* @param pix_fmt the pixel format of the image
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* @param width the width of the image in pixels
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* @param height the height of the image in pixels
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* @param align the assumed linesize alignment
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* @return the buffer size in bytes, a negative error code in case of failure
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*/
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int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align);
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/**
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* Copy image data from an image into a buffer.
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*
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* av_image_get_buffer_size() can be used to compute the required size
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* for the buffer to fill.
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*
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* @param dst a buffer into which picture data will be copied
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* @param dst_size the size in bytes of dst
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* @param src_data pointers containing the source image data
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* @param src_linesize linesizes for the image in src_data
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* @param pix_fmt the pixel format of the source image
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* @param width the width of the source image in pixels
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* @param height the height of the source image in pixels
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* @param align the assumed linesize alignment for dst
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* @return the number of bytes written to dst, or a negative value
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* (error code) on error
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*/
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int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
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const uint8_t * const src_data[4], const int src_linesize[4],
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enum AVPixelFormat pix_fmt, int width, int height, int align);
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/**
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* Check if the given dimension of an image is valid, meaning that all
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* bytes of the image can be addressed with a signed int.
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*
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* @param w the width of the picture
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* @param h the height of the picture
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* @param log_offset the offset to sum to the log level for logging with log_ctx
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* @param log_ctx the parent logging context, it may be NULL
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* @return >= 0 if valid, a negative error code otherwise
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*/
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int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx);
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/**
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* Check if the given dimension of an image is valid, meaning that all
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* bytes of a plane of an image with the specified pix_fmt can be addressed
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* with a signed int.
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*
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* @param w the width of the picture
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* @param h the height of the picture
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* @param max_pixels the maximum number of pixels the user wants to accept
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* @param pix_fmt the pixel format, can be AV_PIX_FMT_NONE if unknown.
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* @param log_offset the offset to sum to the log level for logging with log_ctx
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* @param log_ctx the parent logging context, it may be NULL
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* @return >= 0 if valid, a negative error code otherwise
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*/
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int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx);
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/**
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* Check if the given sample aspect ratio of an image is valid.
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*
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* It is considered invalid if the denominator is 0 or if applying the ratio
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* to the image size would make the smaller dimension less than 1. If the
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* sar numerator is 0, it is considered unknown and will return as valid.
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*
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* @param w width of the image
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* @param h height of the image
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* @param sar sample aspect ratio of the image
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* @return 0 if valid, a negative AVERROR code otherwise
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*/
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int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar);
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/**
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* Overwrite the image data with black. This is suitable for filling a
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* sub-rectangle of an image, meaning the padding between the right most pixel
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* and the left most pixel on the next line will not be overwritten. For some
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* formats, the image size might be rounded up due to inherent alignment.
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*
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* If the pixel format has alpha, the alpha is cleared to opaque.
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*
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* This can return an error if the pixel format is not supported. Normally, all
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* non-hwaccel pixel formats should be supported.
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*
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* Passing NULL for dst_data is allowed. Then the function returns whether the
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* operation would have succeeded. (It can return an error if the pix_fmt is
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* not supported.)
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*
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* @param dst_data data pointers to destination image
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* @param dst_linesize linesizes for the destination image
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* @param pix_fmt the pixel format of the image
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* @param range the color range of the image (important for colorspaces such as YUV)
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* @param width the width of the image in pixels
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* @param height the height of the image in pixels
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* @return 0 if the image data was cleared, a negative AVERROR code otherwise
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*/
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int av_image_fill_black(uint8_t *dst_data[4], const ptrdiff_t dst_linesize[4],
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enum AVPixelFormat pix_fmt, enum AVColorRange range,
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int width, int height);
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/**
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* @}
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*/
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#endif /* AVUTIL_IMGUTILS_H */
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