[FFmpeg-devel] [PATCH 1/2] avutil: add a Tile Grid API

[James Almer <jamrial@gmail.com>]

This includes a struct and helpers. It will be used to support container level
tiled image formats like HEIF, but should be generic enough for general usage.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavutil/Makefile |   2 +
 libavutil/tile.c   |  72 +++++++++++++++++++++++++
 libavutil/tile.h   | 132 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 206 insertions(+)
 create mode 100644 libavutil/tile.c
 create mode 100644 libavutil/tile.h

diff --git a/libavutil/Makefile b/libavutil/Makefile
index e7709b97d0..380d706cfe 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -82,6 +82,7 @@ HEADERS = adler32.h                                                     \
           spherical.h                                                   \
           stereo3d.h                                                    \
           threadmessage.h                                               \
+          tile.h                                                        \
           time.h                                                        \
           timecode.h                                                    \
           timestamp.h                                                   \
@@ -172,6 +173,7 @@ OBJS = adler32.o                                                        \
        spherical.o                                                      \
        stereo3d.o                                                       \
        threadmessage.o                                                  \
+       tile.o                                                           \
        time.o                                                           \
        timecode.o                                                       \
        tree.o                                                           \
diff --git a/libavutil/tile.c b/libavutil/tile.c
new file mode 100644
index 0000000000..d6a95d85ed
--- /dev/null
+++ b/libavutil/tile.c
@@ -0,0 +1,72 @@
+/*
+ * 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
+ */
+
+#include <stdint.h>
+#include <limits.h>
+
+#include "log.h"
+#include "mem.h"
+#include "opt.h"
+#include "tile.h"
+
+#define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
+#define OFFSET(x) offsetof(AVTileGrid, x)
+static const AVOption tile_grid_options[] = {
+    { "type", NULL, OFFSET(type), AV_OPT_TYPE_INT,
+            { .i64 = AV_TILE_DIMENSION_TYPE_UNIFORM },
+            AV_TILE_DIMENSION_TYPE_UNIFORM, AV_TILE_DIMENSION_TYPE_VARIABLE, FLAGS, "type" },
+        { "uniform",  NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_TILE_DIMENSION_TYPE_UNIFORM },  .unit = "type" },
+        { "variable", NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_TILE_DIMENSION_TYPE_VARIABLE }, .unit = "type" },
+    { "tile_rows", NULL, OFFSET(tile_rows), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, UINT_MAX, FLAGS },
+    { "tile_cols", NULL, OFFSET(tile_cols), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, UINT_MAX, FLAGS },
+    { "output_size", "size of the output image", OFFSET(output_width), AV_OPT_TYPE_IMAGE_SIZE,
+        { .str = NULL }, 0, INT_MAX, FLAGS },
+    { NULL },
+};
+
+static const AVClass tile_grid_class = {
+    .class_name          = "AVTileGrid",
+    .version             = LIBAVUTIL_VERSION_INT,
+    .option              = tile_grid_options,
+};
+
+const AVClass *av_tile_grid_get_class(void)
+{
+    return &tile_grid_class;
+}
+
+AVTileGrid *av_tile_grid_alloc(void)
+{
+    return av_mallocz(sizeof(AVTileGrid));
+}
+
+void av_tile_grid_free(AVTileGrid **ptile_grid)
+{
+    AVTileGrid *tile_grid = *ptile_grid;
+
+    if (!tile_grid)
+        return;
+
+    if (tile_grid->type == AV_TILE_DIMENSION_TYPE_VARIABLE) {
+        av_freep(&tile_grid->w.tile_widths);
+        av_freep(&tile_grid->h.tile_heights);
+    }
+    av_freep(ptile_grid);
+}
diff --git a/libavutil/tile.h b/libavutil/tile.h
new file mode 100644
index 0000000000..fb8af0d56f
--- /dev/null
+++ b/libavutil/tile.h
@@ -0,0 +1,132 @@
+/*
+ * 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_TILE_H
+#define AVUTIL_TILE_H
+
+#include <stdint.h>
+
+#include "log.h"
+
+/**
+ * @defgroup lavu_tile_grid Tile grid paremeters
+ * @{
+ */
+
+enum AVTileGridType {
+    AV_TILE_DIMENSION_TYPE_UNIFORM,  ///< All tiles have the same size
+    AV_TILE_DIMENSION_TYPE_VARIABLE, ///< Tiles may have variable size
+};
+
+typedef struct AVTileGrid {
+    const AVClass *av_class;
+
+    int tile_rows;  ///< rows in the final grid
+    int tile_cols;  ///< cols in the final grid
+
+    enum AVTileGridType type;
+
+    union {
+        /**
+         * Height of every tile.
+         * This member must be used when the type is AV_TILE_DIMENSION_TYPE_UNIFORM.
+         */
+        int tile_height;
+        /**
+         * A @ref tile_rows * @ref tile_cols sized array of height values for each
+         * tile in the grid, in row major order.
+         * This member must be used when the type is AV_TILE_DIMENSION_TYPE_VARIABLE
+         *
+         * Must be allocated with the av_malloc() family of functions, and will be
+         * freed by av_tile_grid_free().
+         */
+        int *tile_heights;
+    } h;
+
+    union {
+        /**
+         * Width of every tile.
+         * This member must be used when the type is AV_TILE_DIMENSION_TYPE_UNIFORM.
+         */
+        int tile_width;
+        /**
+         * A @ref tile_rows * @ref tile_cols sized array of width values for each
+         * tile in the grid, in row major order.
+         * This member must be used when the type is AV_TILE_DIMENSION_TYPE_VARIABLE
+         *
+         * Must be allocated with the av_malloc() family of functions, and will be
+         * freed by av_tile_grid_free().
+         */
+        int *tile_widths;
+    } w;
+
+    /**
+     * Width of the final image for presentation.
+     *
+     * When @ref type is AV_TILE_DIMENSION_TYPE_UNIFORM, this field must be > 0
+     * and <= tile_width * tile_cols.
+     * When it's not equal to tile_width * tile_cols, the result of
+     * (tile_width * tile_cols) - output_width is the amount of pixels to be
+     * cropped from the right edge of the final image before presentation.
+     *
+     * When @ref type is AV_TILE_DIMENSION_TYPE_VARIABLE, this field must be > 0
+     * and <= the sum of all values in the tile_widths array.
+     * When it's not equal to the sum of all values in the tile_widths array,
+     * the result of said sum minus output_width is the amount of pixels to be
+     * cropped from the right edge of the final image before presentation.
+     */
+    int output_width;
+    /**
+     * Height of the final image for presentation.
+     *
+     * When @ref type is AV_TILE_DIMENSION_TYPE_UNIFORM, this field must be > 0
+     * and <= tile_height * tile_rows.
+     * When it's not equal to tile_height * tile_rows, the result of
+     * (tile_height * tile_rows) - output_width is the amount of pixels to be
+     * cropped from the bottom edge of the final image before presentation.
+     *
+     * When @ref type is AV_TILE_DIMENSION_TYPE_VARIABLE, this field must be > 0
+     * and <= the sum of all values in the tile_heights array.
+     * When it's not equal to the sum of all values in the tile_heights array,
+     * the result of said sum minus output_height is the amount of pixels to be
+     * cropped from the bottom edge of the final image before presentation.
+     */
+    int output_height;
+} AVTileGrid;
+
+const AVClass *av_tile_grid_get_class(void);
+
+/**
+ * Allocates a AVTileGrid, and initializes its fields with default values.
+ * Must be freed with av_tile_grid_free().
+ */
+AVTileGrid *av_tile_grid_alloc(void);
+
+/**
+ * Free an AVTileGrid and all its contents.
+ *
+ * @param tile_grid pointer to pointer to an allocated AVTileGrid.
+ *                  upon return, *tile_grid will be set to NULL.
+ */
+void av_tile_grid_free(AVTileGrid **tile_grid);
+
+/**
+ * @}
+ */
+
+#endif /* AVUTIL_TILE_H */
-- 
2.43.0

_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel

To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".