Delphi-OpenCV/source/ffmpeg/ffm.imgutils.pas

unit ffm.imgutils;

{$i ffmpeg.inc}

interface

uses
  ffm.pixfmt, ffm.frame;

(*
  * This file is part of ffm.
  *
  * 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
*)

(*
  * 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);
// Type
// TPointers = array [0 .. 3] of pByte;
// pPointers = ^TPointers;
// TLinesizes = array [0 .. 3] of integer;
// pLinesizes = ^TLinesizes;

function av_image_alloc(Var pointers: TAVFrameByteArray; linesizes: TLinesizes; w: integer; h: integer;
  pix_fmt: TAVPixelFormat; align: integer): integer; cdecl;
// function av_image_alloc(pointers: pPointers; linesizes: TLinesizes; w: integer; h: integer; pix_fmt: TAVPixelFormat;
// align: integer): integer; overload; cdecl;

(*
  * 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);

(*
  * 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_linesizes 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[in] align the assumed linesize alignment
*)
// 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_linesizes 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);

// int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);

implementation

uses ffm.lib;

function av_image_alloc; external avutil_dll;
// function av_image_alloc(Var pointers: TPointers; linesizes: TLinesizes; w: integer; h: integer; pix_fmt: TAVPixelFormat;
// align: integer): integer; overload; cdecl; external avutil_dll name 'av_image_alloc';
// function av_image_alloc(pointers: pPointers; linesizes: TLinesizes; w: integer; h: integer; pix_fmt: TAVPixelFormat;
// align: integer): integer; overload; cdecl; external avutil_dll name 'av_image_alloc';

end.