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d5de9965ef
The reason why the generic av_image_copy_uc_from() doesn't really fit in the case for Vulkan is because some planes may be copied via other methods (such as mapping GPU memory), and if they don't satisfy the strict alignment requirements, a gpu image->gpu buffer->cpu ram copy is performed. We need this for hwcontext_vulkan, and I think this will also be useful to API users like libplacebo who would rather not write a custom SIMD memcpy.
310 lines
13 KiB
C
310 lines
13 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 sizes for an image with pixel format pix_fmt and height height.
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*
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* @param size the array to be filled with the size of each image plane
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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 >= 0 in case of success, a negative error code otherwise
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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_fill_linesizes().
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*/
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int av_image_fill_plane_sizes(size_t size[4], enum AVPixelFormat pix_fmt,
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int height, const ptrdiff_t linesizes[4]);
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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 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_plane().
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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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* @note The linesize parameters have the type ptrdiff_t here, while they are
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* int for av_image_copy_plane().
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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_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize,
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const uint8_t *src, ptrdiff_t src_linesize,
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ptrdiff_t 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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