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FFmpeg/libavutil/imgutils.c
Derek Buitenhuis 21f9468402 avutil: Rename FF_CEIL_COMPAT to AV_CEIL_COMPAT 
Libav, for some reason, merged this as a public API function. This will
aid in future merges.

A define is left for backwards compat, just in case some person
used it, since it is in a public header.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
2016-01-27 16:36:46 +00:00

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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 "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_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
uint8_t *ptr, const int linesizes[4])
{
int i, total_size, size[4] = { 0 }, has_plane[4] = { 0 };
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
memset(data , 0, sizeof(data[0])*4);
if (!desc || desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
return AVERROR(EINVAL);
data[0] = ptr;
if (linesizes[0] > (INT_MAX - 1024) / height)
return AVERROR(EINVAL);
size[0] = linesizes[0] * height;
if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
size[0] = (size[0] + 3) & ~3;
data[1] = ptr + size[0]; /* palette is stored here as 256 32 bits words */
return size[0] + 256 * 4;
}
for (i = 0; i < 4; i++)
has_plane[desc->comp[i].plane] = 1;
total_size = size[0];
for (i = 1; i < 4 && has_plane[i]; i++) {
int h, s = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
data[i] = data[i-1] + size[i-1];
h = (height + (1 << s) - 1) >> s;
if (linesizes[i] > INT_MAX / h)
return AVERROR(EINVAL);
size[i] = h * linesizes[i];
if (total_size > INT_MAX - size[i])
return AVERROR(EINVAL);
total_size += size[i];
}
return total_size;
}
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;
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);
if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
return ret;
buf = av_malloc(ret + align);
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 || desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
avpriv_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
if ((desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) &&
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,
.version = LIBAVUTIL_VERSION_INT,
.log_level_offset_offset = offsetof(ImgUtils, log_offset),
.parent_log_context_offset = offsetof(ImgUtils, log_ctx),
};
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
{
ImgUtils imgutils = {
.class = &imgutils_class,
.log_offset = log_offset,
.log_ctx = log_ctx,
};
if ((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
return 0;
av_log(&imgutils, AV_LOG_ERROR, "Picture size %ux%u is invalid\n", w, h);
return AVERROR(EINVAL);
}
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);
}
void av_image_copy_plane(uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize,
int bytewidth, int height)
{
if (!dst || !src)
return;
av_assert0(abs(src_linesize) >= bytewidth);
av_assert0(abs(dst_linesize) >= bytewidth);
for (;height > 0; height--) {
memcpy(dst, src, bytewidth);
dst += dst_linesize;
src += src_linesize;
}
}
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)
{
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 ||
desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {
av_image_copy_plane(dst_data[0], dst_linesizes[0],
src_data[0], src_linesizes[0],
width, height);
/* copy the palette */
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;
int 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);
}
av_image_copy_plane(dst_data[i], dst_linesizes[i],
src_data[i], src_linesizes[i],
bwidth, h);
}
}
}
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)
{
uint8_t *data[4];
int linesize[4];
int ret;
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;
// do not include palette for these pseudo-paletted formats
if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
return width * height;
return av_image_fill_arrays(data, linesize, NULL, pix_fmt,
width, height, align);
}
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);
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++;
av_image_fill_linesizes(linesize, pix_fmt, width);
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 *)(((size_t)dst + 3) & ~3);
for (i = 0; i<256; i++)
AV_WL32(d32 + i, AV_RN32(src_data[1] + 4*i));
}
return size;
}
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