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ffmpeg/libavutil/imgutils.c
Lynne d5de9965ef
imgutils: expose av_image_copy_plane_uc_from() 
The reason why the generic av_image_copy_uc_from() doesn't really
fit in the case for Vulkan is because some planes may be copied via
other methods (such as mapping GPU memory), and if they don't satisfy
the strict alignment requirements, a gpu image->gpu buffer->cpu ram
copy is performed.

We need this for hwcontext_vulkan, and I think this will also be
useful to API users like libplacebo who would rather not write
a custom SIMD memcpy.
2021-08-14 00:27:43 +02:00

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/*
* 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;
}
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