FFmpeg 6.0
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imgutils.h
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1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#ifndef AVUTIL_IMGUTILS_H
20#define AVUTIL_IMGUTILS_H
21
22/**
23 * @file
24 * misc image utilities
25 *
26 * @addtogroup lavu_picture
27 * @{
28 */
29
30#include <stddef.h>
31#include <stdint.h>
32#include "pixdesc.h"
33#include "pixfmt.h"
34#include "rational.h"
35
36/**
37 * Compute the max pixel step for each plane of an image with a
38 * format described by pixdesc.
39 *
40 * The pixel step is the distance in bytes between the first byte of
41 * the group of bytes which describe a pixel component and the first
42 * byte of the successive group in the same plane for the same
43 * component.
44 *
45 * @param max_pixsteps an array which is filled with the max pixel step
46 * for each plane. Since a plane may contain different pixel
47 * components, the computed max_pixsteps[plane] is relative to the
48 * component in the plane with the max pixel step.
49 * @param max_pixstep_comps an array which is filled with the component
50 * for each plane which has the max pixel step. May be NULL.
51 * @param pixdesc the AVPixFmtDescriptor for the image, describing its format
52 */
53void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
54 const AVPixFmtDescriptor *pixdesc);
55
56/**
57 * Compute the size of an image line with format pix_fmt and width
58 * width for the plane plane.
59 *
60 * @return the computed size in bytes
61 */
63
64/**
65 * Fill plane linesizes for an image with pixel format pix_fmt and
66 * width width.
67 *
68 * @param linesizes array to be filled with the linesize for each plane
69 * @param pix_fmt the AVPixelFormat of the image
70 * @param width width of the image in pixels
71 * @return >= 0 in case of success, a negative error code otherwise
72 */
73int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width);
74
75/**
76 * Fill plane sizes for an image with pixel format pix_fmt and height height.
77 *
78 * @param size the array to be filled with the size of each image plane
79 * @param pix_fmt the AVPixelFormat of the image
80 * @param height height of the image in pixels
81 * @param linesizes the array containing the linesize for each
82 * plane, should be filled by av_image_fill_linesizes()
83 * @return >= 0 in case of success, a negative error code otherwise
84 *
85 * @note The linesize parameters have the type ptrdiff_t here, while they are
86 * int for av_image_fill_linesizes().
87 */
89 int height, const ptrdiff_t linesizes[4]);
90
91/**
92 * Fill plane data pointers for an image with pixel format pix_fmt and
93 * height height.
94 *
95 * @param data pointers array to be filled with the pointer for each image plane
96 * @param pix_fmt the AVPixelFormat of the image
97 * @param height height of the image in pixels
98 * @param ptr the pointer to a buffer which will contain the image
99 * @param linesizes the array containing the linesize for each
100 * plane, should be filled by av_image_fill_linesizes()
101 * @return the size in bytes required for the image buffer, a negative
102 * error code in case of failure
103 */
104int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
105 uint8_t *ptr, const int linesizes[4]);
106
107/**
108 * Allocate an image with size w and h and pixel format pix_fmt, and
109 * fill pointers and linesizes accordingly.
110 * The allocated image buffer has to be freed by using
111 * av_freep(&pointers[0]).
112 *
113 * @param pointers array to be filled with the pointer for each image plane
114 * @param linesizes the array filled with the linesize for each plane
115 * @param w width of the image in pixels
116 * @param h height of the image in pixels
117 * @param pix_fmt the AVPixelFormat of the image
118 * @param align the value to use for buffer size alignment
119 * @return the size in bytes required for the image buffer, a negative
120 * error code in case of failure
121 */
122int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
123 int w, int h, enum AVPixelFormat pix_fmt, int align);
124
125/**
126 * Copy image plane from src to dst.
127 * That is, copy "height" number of lines of "bytewidth" bytes each.
128 * The first byte of each successive line is separated by *_linesize
129 * bytes.
130 *
131 * bytewidth must be contained by both absolute values of dst_linesize
132 * and src_linesize, otherwise the function behavior is undefined.
133 *
134 * @param dst destination plane to copy to
135 * @param dst_linesize linesize for the image plane in dst
136 * @param src source plane to copy from
137 * @param src_linesize linesize for the image plane in src
138 * @param height height (number of lines) of the plane
139 */
140void av_image_copy_plane(uint8_t *dst, int dst_linesize,
141 const uint8_t *src, int src_linesize,
142 int bytewidth, int height);
143
144/**
145 * Copy image data located in uncacheable (e.g. GPU mapped) memory. Where
146 * available, this function will use special functionality for reading from such
147 * memory, which may result in greatly improved performance compared to plain
148 * av_image_copy_plane().
149 *
150 * bytewidth must be contained by both absolute values of dst_linesize
151 * and src_linesize, otherwise the function behavior is undefined.
152 *
153 * @note The linesize parameters have the type ptrdiff_t here, while they are
154 * int for av_image_copy_plane().
155 * @note On x86, the linesizes currently need to be aligned to the cacheline
156 * size (i.e. 64) to get improved performance.
157 */
158void av_image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize,
159 const uint8_t *src, ptrdiff_t src_linesize,
160 ptrdiff_t bytewidth, int height);
161
162/**
163 * Copy image in src_data to dst_data.
164 *
165 * @param dst_data destination image data buffer to copy to
166 * @param dst_linesizes linesizes for the image in dst_data
167 * @param src_data source image data buffer to copy from
168 * @param src_linesizes linesizes for the image in src_data
169 * @param pix_fmt the AVPixelFormat of the image
170 * @param width width of the image in pixels
171 * @param height height of the image in pixels
172 */
173void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
174 const uint8_t *src_data[4], const int src_linesizes[4],
175 enum AVPixelFormat pix_fmt, int width, int height);
176
177/**
178 * Copy image data located in uncacheable (e.g. GPU mapped) memory. Where
179 * available, this function will use special functionality for reading from such
180 * memory, which may result in greatly improved performance compared to plain
181 * av_image_copy().
182 *
183 * The data pointers and the linesizes must be aligned to the maximum required
184 * by the CPU architecture.
185 *
186 * @note The linesize parameters have the type ptrdiff_t here, while they are
187 * int for av_image_copy().
188 * @note On x86, the linesizes currently need to be aligned to the cacheline
189 * size (i.e. 64) to get improved performance.
190 */
191void av_image_copy_uc_from(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4],
192 const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4],
193 enum AVPixelFormat pix_fmt, int width, int height);
194
195/**
196 * Setup the data pointers and linesizes based on the specified image
197 * parameters and the provided array.
198 *
199 * The fields of the given image are filled in by using the src
200 * address which points to the image data buffer. Depending on the
201 * specified pixel format, one or multiple image data pointers and
202 * line sizes will be set. If a planar format is specified, several
203 * pointers will be set pointing to the different picture planes and
204 * the line sizes of the different planes will be stored in the
205 * lines_sizes array. Call with src == NULL to get the required
206 * size for the src buffer.
207 *
208 * To allocate the buffer and fill in the dst_data and dst_linesize in
209 * one call, use av_image_alloc().
210 *
211 * @param dst_data data pointers to be filled in
212 * @param dst_linesize linesizes for the image in dst_data to be filled in
213 * @param src buffer which will contain or contains the actual image data, can be NULL
214 * @param pix_fmt the pixel format of the image
215 * @param width the width of the image in pixels
216 * @param height the height of the image in pixels
217 * @param align the value used in src for linesize alignment
218 * @return the size in bytes required for src, a negative error code
219 * in case of failure
220 */
221int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4],
222 const uint8_t *src,
223 enum AVPixelFormat pix_fmt, int width, int height, int align);
224
225/**
226 * Return the size in bytes of the amount of data required to store an
227 * image with the given parameters.
228 *
229 * @param pix_fmt the pixel format of the image
230 * @param width the width of the image in pixels
231 * @param height the height of the image in pixels
232 * @param align the assumed linesize alignment
233 * @return the buffer size in bytes, a negative error code in case of failure
234 */
236
237/**
238 * Copy image data from an image into a buffer.
239 *
240 * av_image_get_buffer_size() can be used to compute the required size
241 * for the buffer to fill.
242 *
243 * @param dst a buffer into which picture data will be copied
244 * @param dst_size the size in bytes of dst
245 * @param src_data pointers containing the source image data
246 * @param src_linesize linesizes for the image in src_data
247 * @param pix_fmt the pixel format of the source image
248 * @param width the width of the source image in pixels
249 * @param height the height of the source image in pixels
250 * @param align the assumed linesize alignment for dst
251 * @return the number of bytes written to dst, or a negative value
252 * (error code) on error
253 */
254int av_image_copy_to_buffer(uint8_t *dst, int dst_size,
255 const uint8_t * const src_data[4], const int src_linesize[4],
256 enum AVPixelFormat pix_fmt, int width, int height, int align);
257
258/**
259 * Check if the given dimension of an image is valid, meaning that all
260 * bytes of the image can be addressed with a signed int.
261 *
262 * @param w the width of the picture
263 * @param h the height of the picture
264 * @param log_offset the offset to sum to the log level for logging with log_ctx
265 * @param log_ctx the parent logging context, it may be NULL
266 * @return >= 0 if valid, a negative error code otherwise
267 */
268int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx);
269
270/**
271 * Check if the given dimension of an image is valid, meaning that all
272 * bytes of a plane of an image with the specified pix_fmt can be addressed
273 * with a signed int.
274 *
275 * @param w the width of the picture
276 * @param h the height of the picture
277 * @param max_pixels the maximum number of pixels the user wants to accept
278 * @param pix_fmt the pixel format, can be AV_PIX_FMT_NONE if unknown.
279 * @param log_offset the offset to sum to the log level for logging with log_ctx
280 * @param log_ctx the parent logging context, it may be NULL
281 * @return >= 0 if valid, a negative error code otherwise
282 */
283int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx);
284
285/**
286 * Check if the given sample aspect ratio of an image is valid.
287 *
288 * It is considered invalid if the denominator is 0 or if applying the ratio
289 * to the image size would make the smaller dimension less than 1. If the
290 * sar numerator is 0, it is considered unknown and will return as valid.
291 *
292 * @param w width of the image
293 * @param h height of the image
294 * @param sar sample aspect ratio of the image
295 * @return 0 if valid, a negative AVERROR code otherwise
296 */
297int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar);
298
299/**
300 * Overwrite the image data with black. This is suitable for filling a
301 * sub-rectangle of an image, meaning the padding between the right most pixel
302 * and the left most pixel on the next line will not be overwritten. For some
303 * formats, the image size might be rounded up due to inherent alignment.
304 *
305 * If the pixel format has alpha, the alpha is cleared to opaque.
306 *
307 * This can return an error if the pixel format is not supported. Normally, all
308 * non-hwaccel pixel formats should be supported.
309 *
310 * Passing NULL for dst_data is allowed. Then the function returns whether the
311 * operation would have succeeded. (It can return an error if the pix_fmt is
312 * not supported.)
313 *
314 * @param dst_data data pointers to destination image
315 * @param dst_linesize linesizes for the destination image
316 * @param pix_fmt the pixel format of the image
317 * @param range the color range of the image (important for colorspaces such as YUV)
318 * @param width the width of the image in pixels
319 * @param height the height of the image in pixels
320 * @return 0 if the image data was cleared, a negative AVERROR code otherwise
321 */
322int av_image_fill_black(uint8_t *dst_data[4], const ptrdiff_t dst_linesize[4],
323 enum AVPixelFormat pix_fmt, enum AVColorRange range,
324 int width, int height);
325
326/**
327 * @}
328 */
329
330
331#endif /* AVUTIL_IMGUTILS_H */
static int width
static enum AVPixelFormat pix_fmt
static int height
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters.
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
void av_image_copy_plane_uc_from(uint8_t *dst, ptrdiff_t dst_linesize, const uint8_t *src, ptrdiff_t src_linesize, ptrdiff_t bytewidth, int height)
Copy image data located in uncacheable (e.g.
int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height, uint8_t *ptr, const int linesizes[4])
Fill plane data pointers for an image with pixel format pix_fmt and height height.
int av_image_fill_black(uint8_t *dst_data[4], const ptrdiff_t dst_linesize[4], enum AVPixelFormat pix_fmt, enum AVColorRange range, int width, int height)
Overwrite the image data with black.
int av_image_fill_plane_sizes(size_t size[4], enum AVPixelFormat pix_fmt, int height, const ptrdiff_t linesizes[4])
Fill plane sizes for an image with pixel format pix_fmt and height height.
int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], const uint8_t *src, enum AVPixelFormat pix_fmt, int width, int height, int align)
Setup the data pointers and linesizes based on the specified image parameters and the provided array.
void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], const uint8_t *src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Copy image in src_data to dst_data.
int av_image_copy_to_buffer(uint8_t *dst, int dst_size, const uint8_t *const src_data[4], const int src_linesize[4], enum AVPixelFormat pix_fmt, int width, int height, int align)
Copy image data from an image into a buffer.
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
int av_image_alloc(uint8_t *pointers[4], int linesizes[4], int w, int h, enum AVPixelFormat pix_fmt, int align)
Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...
void av_image_copy_uc_from(uint8_t *dst_data[4], const ptrdiff_t dst_linesizes[4], const uint8_t *src_data[4], const ptrdiff_t src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Copy image data located in uncacheable (e.g.
int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
Compute the size of an image line with format pix_fmt and width width for the plane plane.
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)
Check if the given dimension of an image is valid, meaning that all bytes of a plane of an image with...
int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
Fill plane linesizes for an image with pixel format pix_fmt and width width.
void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4], const AVPixFmtDescriptor *pixdesc)
Compute the max pixel step for each plane of an image with a format described by pixdesc.
int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
Check if the given sample aspect ratio of an image is valid.
pixel format definitions
AVColorRange
Visual content value range.
Definition pixfmt.h:626
AVPixelFormat
Pixel format.
Definition pixfmt.h:64
Utilties for rational number calculation.
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition pixdesc.h:69
Rational number (pair of numerator and denominator).
Definition rational.h:58