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-rw-r--r--media/ffvpx/libavutil/imgutils.c692
1 files changed, 692 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/imgutils.c b/media/ffvpx/libavutil/imgutils.c
new file mode 100644
index 0000000000..9ab5757cf6
--- /dev/null
+++ b/media/ffvpx/libavutil/imgutils.c
@@ -0,0 +1,692 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * misc image utilities
+ */
+
+#include "avassert.h"
+#include "common.h"
+#include "imgutils.h"
+#include "imgutils_internal.h"
+#include "internal.h"
+#include "intreadwrite.h"
+#include "log.h"
+#include "mathematics.h"
+#include "pixdesc.h"
+#include "rational.h"
+
+void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
+ const AVPixFmtDescriptor *pixdesc)
+{
+ int i;
+ memset(max_pixsteps, 0, 4*sizeof(max_pixsteps[0]));
+ if (max_pixstep_comps)
+ memset(max_pixstep_comps, 0, 4*sizeof(max_pixstep_comps[0]));
+
+ for (i = 0; i < 4; i++) {
+ const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
+ if (comp->step > max_pixsteps[comp->plane]) {
+ max_pixsteps[comp->plane] = comp->step;
+ if (max_pixstep_comps)
+ max_pixstep_comps[comp->plane] = i;
+ }
+ }
+}
+
+static inline
+int image_get_linesize(int width, int plane,
+ int max_step, int max_step_comp,
+ const AVPixFmtDescriptor *desc)
+{
+ int s, shifted_w, linesize;
+
+ if (!desc)
+ return AVERROR(EINVAL);
+
+ if (width < 0)
+ return AVERROR(EINVAL);
+ s = (max_step_comp == 1 || max_step_comp == 2) ? desc->log2_chroma_w : 0;
+ shifted_w = ((width + (1 << s) - 1)) >> s;
+ if (shifted_w && max_step > INT_MAX / shifted_w)
+ return AVERROR(EINVAL);
+ linesize = max_step * shifted_w;
+
+ if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)
+ linesize = (linesize + 7) >> 3;
+ return linesize;
+}
+
+int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
+{
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ int max_step [4]; /* max pixel step for each plane */
+ int max_step_comp[4]; /* the component for each plane which has the max pixel step */
+
+ if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
+ return AVERROR(EINVAL);
+
+ av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
+ return image_get_linesize(width, plane, max_step[plane], max_step_comp[plane], desc);
+}
+
+int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width)
+{
+ int i, ret;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ int max_step [4]; /* max pixel step for each plane */
+ int max_step_comp[4]; /* the component for each plane which has the max pixel step */
+
+ memset(linesizes, 0, 4*sizeof(linesizes[0]));
+
+ if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
+ return AVERROR(EINVAL);
+
+ av_image_fill_max_pixsteps(max_step, max_step_comp, desc);
+ for (i = 0; i < 4; i++) {
+ if ((ret = image_get_linesize(width, i, max_step[i], max_step_comp[i], desc)) < 0)
+ return ret;
+ linesizes[i] = ret;
+ }
+
+ return 0;
+}
+
+int av_image_fill_plane_sizes(size_t sizes[4], enum AVPixelFormat pix_fmt,
+ int height, const ptrdiff_t linesizes[4])
+{
+ int i, has_plane[4] = { 0 };
+
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ memset(sizes , 0, sizeof(sizes[0])*4);
+
+ if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
+ return AVERROR(EINVAL);
+
+ if (linesizes[0] > SIZE_MAX / height)
+ return AVERROR(EINVAL);
+ sizes[0] = linesizes[0] * (size_t)height;
+
+ if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
+ sizes[1] = 256 * 4; /* palette is stored here as 256 32 bits words */
+ return 0;
+ }
+
+ for (i = 0; i < 4; i++)
+ has_plane[desc->comp[i].plane] = 1;
+
+ for (i = 1; i < 4 && has_plane[i]; i++) {
+ int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
+ h = (height + (1 << s) - 1) >> s;
+ if (linesizes[i] > SIZE_MAX / h)
+ return AVERROR(EINVAL);
+ sizes[i] = (size_t)h * linesizes[i];
+ }
+
+ return 0;
+}
+
+int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
+ uint8_t *ptr, const int linesizes[4])
+{
+ int i, ret;
+ ptrdiff_t linesizes1[4];
+ size_t sizes[4];
+
+ memset(data , 0, sizeof(data[0])*4);
+
+ for (i = 0; i < 4; i++)
+ linesizes1[i] = linesizes[i];
+
+ ret = av_image_fill_plane_sizes(sizes, pix_fmt, height, linesizes1);
+ if (ret < 0)
+ return ret;
+
+ ret = 0;
+ for (i = 0; i < 4; i++) {
+ if (sizes[i] > INT_MAX - ret)
+ return AVERROR(EINVAL);
+ ret += sizes[i];
+ }
+
+ if (!ptr)
+ return ret;
+
+ data[0] = ptr;
+ for (i = 1; i < 4 && sizes[i]; i++)
+ data[i] = data[i - 1] + sizes[i - 1];
+
+ return ret;
+}
+
+int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
+{
+ int i;
+
+ for (i = 0; i < 256; i++) {
+ int r, g, b;
+
+ switch (pix_fmt) {
+ case AV_PIX_FMT_RGB8:
+ r = (i>>5 )*36;
+ g = ((i>>2)&7)*36;
+ b = (i&3 )*85;
+ break;
+ case AV_PIX_FMT_BGR8:
+ b = (i>>6 )*85;
+ g = ((i>>3)&7)*36;
+ r = (i&7 )*36;
+ break;
+ case AV_PIX_FMT_RGB4_BYTE:
+ r = (i>>3 )*255;
+ g = ((i>>1)&3)*85;
+ b = (i&1 )*255;
+ break;
+ case AV_PIX_FMT_BGR4_BYTE:
+ b = (i>>3 )*255;
+ g = ((i>>1)&3)*85;
+ r = (i&1 )*255;
+ break;
+ case AV_PIX_FMT_GRAY8:
+ r = b = g = i;
+ break;
+ default:
+ return AVERROR(EINVAL);
+ }
+ pal[i] = b + (g << 8) + (r << 16) + (0xFFU << 24);
+ }
+
+ return 0;
+}
+
+int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
+ int w, int h, enum AVPixelFormat pix_fmt, int align)
+{
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ int i, ret;
+ ptrdiff_t linesizes1[4];
+ size_t total_size, sizes[4];
+ uint8_t *buf;
+
+ if (!desc)
+ return AVERROR(EINVAL);
+
+ if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
+ return ret;
+ if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, align>7 ? FFALIGN(w, 8) : w)) < 0)
+ return ret;
+
+ for (i = 0; i < 4; i++) {
+ linesizes[i] = FFALIGN(linesizes[i], align);
+ linesizes1[i] = linesizes[i];
+ }
+
+ if ((ret = av_image_fill_plane_sizes(sizes, pix_fmt, h, linesizes1)) < 0)
+ return ret;
+ total_size = align;
+ for (i = 0; i < 4; i++) {
+ if (total_size > SIZE_MAX - sizes[i])
+ return AVERROR(EINVAL);
+ total_size += sizes[i];
+ }
+ buf = av_malloc(total_size);
+ if (!buf)
+ return AVERROR(ENOMEM);
+ if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
+ av_free(buf);
+ return ret;
+ }
+ if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
+ avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
+ if (align < 4) {
+ av_log(NULL, AV_LOG_ERROR, "Formats with a palette require a minimum alignment of 4\n");
+ av_free(buf);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ if (desc->flags & AV_PIX_FMT_FLAG_PAL && pointers[1] &&
+ pointers[1] - pointers[0] > linesizes[0] * h) {
+ /* zero-initialize the padding before the palette */
+ memset(pointers[0] + linesizes[0] * h, 0,
+ pointers[1] - pointers[0] - linesizes[0] * h);
+ }
+
+ return ret;
+}
+
+typedef struct ImgUtils {
+ const AVClass *class;
+ int log_offset;
+ void *log_ctx;
+} ImgUtils;
+
+static const AVClass imgutils_class = {
+ .class_name = "IMGUTILS",
+ .item_name = av_default_item_name,
+ .option = NULL,
+ .version = LIBAVUTIL_VERSION_INT,
+ .log_level_offset_offset = offsetof(ImgUtils, log_offset),
+ .parent_log_context_offset = offsetof(ImgUtils, log_ctx),
+};
+
+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)
+{
+ ImgUtils imgutils = {
+ .class = &imgutils_class,
+ .log_offset = log_offset,
+ .log_ctx = log_ctx,
+ };
+ int64_t stride = av_image_get_linesize(pix_fmt, w, 0);
+ if (stride <= 0)
+ stride = 8LL*w;
+ stride += 128*8;
+
+ if ((int)w<=0 || (int)h<=0 || stride >= INT_MAX || stride*(uint64_t)(h+128) >= INT_MAX) {
+ av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
+ return AVERROR(EINVAL);
+ }
+
+ if (max_pixels < INT64_MAX) {
+ if (w*(int64_t)h > max_pixels) {
+ av_log(&imgutils, AV_LOG_ERROR,
+ "Picture size %ux%u exceeds specified max pixel count %"PRId64", see the documentation if you wish to increase it\n",
+ w, h, max_pixels);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ return 0;
+}
+
+int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
+{
+ return av_image_check_size2(w, h, INT64_MAX, AV_PIX_FMT_NONE, log_offset, log_ctx);
+}
+
+int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
+{
+ int64_t scaled_dim;
+
+ if (sar.den <= 0 || sar.num < 0)
+ return AVERROR(EINVAL);
+
+ if (!sar.num || sar.num == sar.den)
+ return 0;
+
+ if (sar.num < sar.den)
+ scaled_dim = av_rescale_rnd(w, sar.num, sar.den, AV_ROUND_ZERO);
+ else
+ scaled_dim = av_rescale_rnd(h, sar.den, sar.num, AV_ROUND_ZERO);
+
+ if (scaled_dim > 0)
+ return 0;
+
+ return AVERROR(EINVAL);
+}
+
+static void image_copy_plane(uint8_t *dst, ptrdiff_t dst_linesize,
+ const uint8_t *src, ptrdiff_t src_linesize,
+ ptrdiff_t bytewidth, int height)
+{
+ if (!dst || !src)
+ return;
+ av_assert0(FFABS(src_linesize) >= bytewidth);
+ av_assert0(FFABS(dst_linesize) >= bytewidth);
+ for (;height > 0; height--) {
+ memcpy(dst, src, bytewidth);
+ dst += dst_linesize;
+ src += src_linesize;
+ }
+}
+
+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)
+{
+ int ret = -1;
+
+#if ARCH_X86
+ ret = ff_image_copy_plane_uc_from_x86(dst, dst_linesize, src, src_linesize,
+ bytewidth, height);
+#endif
+
+ if (ret < 0)
+ image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
+}
+
+void av_image_copy_plane(uint8_t *dst, int dst_linesize,
+ const uint8_t *src, int src_linesize,
+ int bytewidth, int height)
+{
+ image_copy_plane(dst, dst_linesize, src, src_linesize, bytewidth, height);
+}
+
+static void image_copy(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,
+ void (*copy_plane)(uint8_t *, ptrdiff_t, const uint8_t *,
+ ptrdiff_t, ptrdiff_t, int))
+{
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+
+ if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
+ return;
+
+ if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
+ copy_plane(dst_data[0], dst_linesizes[0],
+ src_data[0], src_linesizes[0],
+ width, height);
+ /* copy the palette */
+ if ((desc->flags & AV_PIX_FMT_FLAG_PAL) || (dst_data[1] && src_data[1]))
+ memcpy(dst_data[1], src_data[1], 4*256);
+ } else {
+ int i, planes_nb = 0;
+
+ for (i = 0; i < desc->nb_components; i++)
+ planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
+
+ for (i = 0; i < planes_nb; i++) {
+ int h = height;
+ ptrdiff_t bwidth = av_image_get_linesize(pix_fmt, width, i);
+ if (bwidth < 0) {
+ av_log(NULL, AV_LOG_ERROR, "av_image_get_linesize failed\n");
+ return;
+ }
+ if (i == 1 || i == 2) {
+ h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h);
+ }
+ copy_plane(dst_data[i], dst_linesizes[i],
+ src_data[i], src_linesizes[i],
+ bwidth, h);
+ }
+ }
+}
+
+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)
+{
+ ptrdiff_t dst_linesizes1[4], src_linesizes1[4];
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ dst_linesizes1[i] = dst_linesizes[i];
+ src_linesizes1[i] = src_linesizes[i];
+ }
+
+ image_copy(dst_data, dst_linesizes1, src_data, src_linesizes1, pix_fmt,
+ width, height, image_copy_plane);
+}
+
+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)
+{
+ image_copy(dst_data, dst_linesizes, src_data, src_linesizes, pix_fmt,
+ width, height, av_image_copy_plane_uc_from);
+}
+
+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)
+{
+ int ret, i;
+
+ ret = av_image_check_size(width, height, 0, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = av_image_fill_linesizes(dst_linesize, pix_fmt, width);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < 4; i++)
+ dst_linesize[i] = FFALIGN(dst_linesize[i], align);
+
+ return av_image_fill_pointers(dst_data, pix_fmt, height, (uint8_t *)src, dst_linesize);
+}
+
+int av_image_get_buffer_size(enum AVPixelFormat pix_fmt,
+ int width, int height, int align)
+{
+ int ret, i;
+ int linesize[4];
+ ptrdiff_t aligned_linesize[4];
+ size_t sizes[4];
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ if (!desc)
+ return AVERROR(EINVAL);
+
+ ret = av_image_check_size(width, height, 0, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = av_image_fill_linesizes(linesize, pix_fmt, width);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < 4; i++)
+ aligned_linesize[i] = FFALIGN(linesize[i], align);
+
+ ret = av_image_fill_plane_sizes(sizes, pix_fmt, height, aligned_linesize);
+ if (ret < 0)
+ return ret;
+
+ ret = 0;
+ for (i = 0; i < 4; i++) {
+ if (sizes[i] > INT_MAX - ret)
+ return AVERROR(EINVAL);
+ ret += sizes[i];
+ }
+ return ret;
+}
+
+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)
+{
+ int i, j, nb_planes = 0, linesize[4];
+ int size = av_image_get_buffer_size(pix_fmt, width, height, align);
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ int ret;
+
+ if (size > dst_size || size < 0 || !desc)
+ return AVERROR(EINVAL);
+
+ for (i = 0; i < desc->nb_components; i++)
+ nb_planes = FFMAX(desc->comp[i].plane, nb_planes);
+
+ nb_planes++;
+
+ ret = av_image_fill_linesizes(linesize, pix_fmt, width);
+ av_assert0(ret >= 0); // was checked previously
+
+ for (i = 0; i < nb_planes; i++) {
+ int h, shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
+ const uint8_t *src = src_data[i];
+ h = (height + (1 << shift) - 1) >> shift;
+
+ for (j = 0; j < h; j++) {
+ memcpy(dst, src, linesize[i]);
+ dst += FFALIGN(linesize[i], align);
+ src += src_linesize[i];
+ }
+ }
+
+ if (desc->flags & AV_PIX_FMT_FLAG_PAL) {
+ uint32_t *d32 = (uint32_t *)dst;
+
+ for (i = 0; i<256; i++)
+ AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
+ }
+
+ return size;
+}
+
+// Fill dst[0..dst_size] with the bytes in clear[0..clear_size]. The clear
+// bytes are repeated until dst_size is reached. If dst_size is unaligned (i.e.
+// dst_size%clear_size!=0), the remaining data will be filled with the beginning
+// of the clear data only.
+static void memset_bytes(uint8_t *dst, size_t dst_size, uint8_t *clear,
+ size_t clear_size)
+{
+ int same = 1;
+ int i;
+
+ if (!clear_size)
+ return;
+
+ // Reduce to memset() if possible.
+ for (i = 0; i < clear_size; i++) {
+ if (clear[i] != clear[0]) {
+ same = 0;
+ break;
+ }
+ }
+ if (same)
+ clear_size = 1;
+
+ if (clear_size == 1) {
+ memset(dst, clear[0], dst_size);
+ } else {
+ if (clear_size > dst_size)
+ clear_size = dst_size;
+ memcpy(dst, clear, clear_size);
+ av_memcpy_backptr(dst + clear_size, clear_size, dst_size - clear_size);
+ }
+}
+
+// Maximum size in bytes of a plane element (usually a pixel, or multiple pixels
+// if it's a subsampled packed format).
+#define MAX_BLOCK_SIZE 32
+
+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)
+{
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ int nb_planes = av_pix_fmt_count_planes(pix_fmt);
+ // A pixel or a group of pixels on each plane, with a value that represents black.
+ // Consider e.g. AV_PIX_FMT_UYVY422 for non-trivial cases.
+ uint8_t clear_block[4][MAX_BLOCK_SIZE] = {{0}}; // clear padding with 0
+ int clear_block_size[4] = {0};
+ ptrdiff_t plane_line_bytes[4] = {0};
+ int rgb, limited;
+ int plane, c;
+
+ if (!desc || nb_planes < 1 || nb_planes > 4 || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
+ return AVERROR(EINVAL);
+
+ rgb = !!(desc->flags & AV_PIX_FMT_FLAG_RGB);
+ limited = !rgb && range != AVCOL_RANGE_JPEG;
+
+ if (desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) {
+ ptrdiff_t bytewidth = av_image_get_linesize(pix_fmt, width, 0);
+ uint8_t *data;
+ int mono = pix_fmt == AV_PIX_FMT_MONOWHITE || pix_fmt == AV_PIX_FMT_MONOBLACK;
+ int fill = pix_fmt == AV_PIX_FMT_MONOWHITE ? 0xFF : 0;
+ if (nb_planes != 1 || !(rgb || mono) || bytewidth < 1)
+ return AVERROR(EINVAL);
+
+ if (!dst_data)
+ return 0;
+
+ data = dst_data[0];
+
+ // (Bitstream + alpha will be handled incorrectly - it'll remain transparent.)
+ for (;height > 0; height--) {
+ memset(data, fill, bytewidth);
+ data += dst_linesize[0];
+ }
+ return 0;
+ }
+
+ for (c = 0; c < desc->nb_components; c++) {
+ const AVComponentDescriptor comp = desc->comp[c];
+
+ // We try to operate on entire non-subsampled pixel groups (for
+ // AV_PIX_FMT_UYVY422 this would mean two consecutive pixels).
+ clear_block_size[comp.plane] = FFMAX(clear_block_size[comp.plane], comp.step);
+
+ if (clear_block_size[comp.plane] > MAX_BLOCK_SIZE)
+ return AVERROR(EINVAL);
+ }
+
+ // Create a byte array for clearing 1 pixel (sometimes several pixels).
+ for (c = 0; c < desc->nb_components; c++) {
+ const AVComponentDescriptor comp = desc->comp[c];
+ // (Multiple pixels happen e.g. with AV_PIX_FMT_UYVY422.)
+ int w = clear_block_size[comp.plane] / comp.step;
+ uint8_t *c_data[4];
+ const int c_linesize[4] = {0};
+ uint16_t src_array[MAX_BLOCK_SIZE];
+ uint16_t src = 0;
+ int x;
+
+ if (comp.depth > 16)
+ return AVERROR(EINVAL);
+ if (!rgb && comp.depth < 8)
+ return AVERROR(EINVAL);
+ if (w < 1)
+ return AVERROR(EINVAL);
+
+ if (c == 0 && limited) {
+ src = 16 << (comp.depth - 8);
+ } else if ((c == 1 || c == 2) && !rgb) {
+ src = 128 << (comp.depth - 8);
+ } else if (c == 3) {
+ // (Assume even limited YUV uses full range alpha.)
+ src = (1 << comp.depth) - 1;
+ }
+
+ for (x = 0; x < w; x++)
+ src_array[x] = src;
+
+ for (x = 0; x < 4; x++)
+ c_data[x] = &clear_block[x][0];
+
+ av_write_image_line(src_array, c_data, c_linesize, desc, 0, 0, c, w);
+ }
+
+ for (plane = 0; plane < nb_planes; plane++) {
+ plane_line_bytes[plane] = av_image_get_linesize(pix_fmt, width, plane);
+ if (plane_line_bytes[plane] < 0)
+ return AVERROR(EINVAL);
+ }
+
+ if (!dst_data)
+ return 0;
+
+ for (plane = 0; plane < nb_planes; plane++) {
+ size_t bytewidth = plane_line_bytes[plane];
+ uint8_t *data = dst_data[plane];
+ int chroma_div = plane == 1 || plane == 2 ? desc->log2_chroma_h : 0;
+ int plane_h = ((height + ( 1 << chroma_div) - 1)) >> chroma_div;
+
+ for (; plane_h > 0; plane_h--) {
+ memset_bytes(data, bytewidth, &clear_block[plane][0], clear_block_size[plane]);
+ data += dst_linesize[plane];
+ }
+ }
+
+ return 0;
+}