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