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librempeg/libswscale/swscale.c
Andreas Rheinhardt a1a1d49355 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2024-04-01 19:51:37 +02:00

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/*
* Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
*
* 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 <stdio.h>
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/bswap.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/emms.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "libavutil/pixdesc.h"
#include "config.h"
#include "swscale_internal.h"
#include "swscale.h"
DECLARE_ALIGNED(8, const uint8_t, ff_dither_8x8_128)[9][8] = {
{ 36, 68, 60, 92, 34, 66, 58, 90, },
{ 100, 4, 124, 28, 98, 2, 122, 26, },
{ 52, 84, 44, 76, 50, 82, 42, 74, },
{ 116, 20, 108, 12, 114, 18, 106, 10, },
{ 32, 64, 56, 88, 38, 70, 62, 94, },
{ 96, 0, 120, 24, 102, 6, 126, 30, },
{ 48, 80, 40, 72, 54, 86, 46, 78, },
{ 112, 16, 104, 8, 118, 22, 110, 14, },
{ 36, 68, 60, 92, 34, 66, 58, 90, },
};
DECLARE_ALIGNED(8, static const uint8_t, sws_pb_64)[8] = {
64, 64, 64, 64, 64, 64, 64, 64
};
static av_always_inline void fillPlane(uint8_t *plane, int stride, int width,
int height, int y, uint8_t val)
{
int i;
uint8_t *ptr = plane + stride * y;
for (i = 0; i < height; i++) {
memset(ptr, val, width);
ptr += stride;
}
}
static void hScale16To19_c(SwsContext *c, int16_t *_dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
int i;
int32_t *dst = (int32_t *) _dst;
const uint16_t *src = (const uint16_t *) _src;
int bits = desc->comp[0].depth - 1;
int sh = bits - 4;
if ((isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8) && desc->comp[0].depth<16) {
sh = 9;
} else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */
sh = 16 - 1 - 4;
}
for (i = 0; i < dstW; i++) {
int j;
int srcPos = filterPos[i];
int val = 0;
for (j = 0; j < filterSize; j++) {
val += src[srcPos + j] * filter[filterSize * i + j];
}
// filter=14 bit, input=16 bit, output=30 bit, >> 11 makes 19 bit
dst[i] = FFMIN(val >> sh, (1 << 19) - 1);
}
}
static void hScale16To15_c(SwsContext *c, int16_t *dst, int dstW,
const uint8_t *_src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
int i;
const uint16_t *src = (const uint16_t *) _src;
int sh = desc->comp[0].depth - 1;
if (sh<15) {
sh = isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8 ? 13 : (desc->comp[0].depth - 1);
} else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */
sh = 16 - 1;
}
for (i = 0; i < dstW; i++) {
int j;
int srcPos = filterPos[i];
int val = 0;
for (j = 0; j < filterSize; j++) {
val += src[srcPos + j] * filter[filterSize * i + j];
}
// filter=14 bit, input=16 bit, output=30 bit, >> 15 makes 15 bit
dst[i] = FFMIN(val >> sh, (1 << 15) - 1);
}
}
// bilinear / bicubic scaling
static void hScale8To15_c(SwsContext *c, int16_t *dst, int dstW,
const uint8_t *src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
int i;
for (i = 0; i < dstW; i++) {
int j;
int srcPos = filterPos[i];
int val = 0;
for (j = 0; j < filterSize; j++) {
val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
}
dst[i] = FFMIN(val >> 7, (1 << 15) - 1); // the cubic equation does overflow ...
}
}
static void hScale8To19_c(SwsContext *c, int16_t *_dst, int dstW,
const uint8_t *src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
int i;
int32_t *dst = (int32_t *) _dst;
for (i = 0; i < dstW; i++) {
int j;
int srcPos = filterPos[i];
int val = 0;
for (j = 0; j < filterSize; j++) {
val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
}
dst[i] = FFMIN(val >> 3, (1 << 19) - 1); // the cubic equation does overflow ...
}
}
// FIXME all pal and rgb srcFormats could do this conversion as well
// FIXME all scalers more complex than bilinear could do half of this transform
static void chrRangeToJpeg_c(int16_t *dstU, int16_t *dstV, int width)
{
int i;
for (i = 0; i < width; i++) {
dstU[i] = (FFMIN(dstU[i], 30775) * 4663 - 9289992) >> 12; // -264
dstV[i] = (FFMIN(dstV[i], 30775) * 4663 - 9289992) >> 12; // -264
}
}
static void chrRangeFromJpeg_c(int16_t *dstU, int16_t *dstV, int width)
{
int i;
for (i = 0; i < width; i++) {
dstU[i] = (dstU[i] * 1799 + 4081085) >> 11; // 1469
dstV[i] = (dstV[i] * 1799 + 4081085) >> 11; // 1469
}
}
static void lumRangeToJpeg_c(int16_t *dst, int width)
{
int i;
for (i = 0; i < width; i++)
dst[i] = (FFMIN(dst[i], 30189) * 19077 - 39057361) >> 14;
}
static void lumRangeFromJpeg_c(int16_t *dst, int width)
{
int i;
for (i = 0; i < width; i++)
dst[i] = (dst[i] * 14071 + 33561947) >> 14;
}
static void chrRangeToJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)
{
int i;
int32_t *dstU = (int32_t *) _dstU;
int32_t *dstV = (int32_t *) _dstV;
for (i = 0; i < width; i++) {
dstU[i] = (FFMIN(dstU[i], 30775 << 4) * 4663 - (9289992 << 4)) >> 12; // -264
dstV[i] = (FFMIN(dstV[i], 30775 << 4) * 4663 - (9289992 << 4)) >> 12; // -264
}
}
static void chrRangeFromJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)
{
int i;
int32_t *dstU = (int32_t *) _dstU;
int32_t *dstV = (int32_t *) _dstV;
for (i = 0; i < width; i++) {
dstU[i] = (dstU[i] * 1799 + (4081085 << 4)) >> 11; // 1469
dstV[i] = (dstV[i] * 1799 + (4081085 << 4)) >> 11; // 1469
}
}
static void lumRangeToJpeg16_c(int16_t *_dst, int width)
{
int i;
int32_t *dst = (int32_t *) _dst;
for (i = 0; i < width; i++) {
dst[i] = ((int)(FFMIN(dst[i], 30189 << 4) * 4769U - (39057361 << 2))) >> 12;
}
}
static void lumRangeFromJpeg16_c(int16_t *_dst, int width)
{
int i;
int32_t *dst = (int32_t *) _dst;
for (i = 0; i < width; i++)
dst[i] = (dst[i]*(14071/4) + (33561947<<4)/4)>>12;
}
#define DEBUG_SWSCALE_BUFFERS 0
#define DEBUG_BUFFERS(...) \
if (DEBUG_SWSCALE_BUFFERS) \
av_log(c, AV_LOG_DEBUG, __VA_ARGS__)
static int swscale(SwsContext *c, const uint8_t *src[],
int srcStride[], int srcSliceY, int srcSliceH,
uint8_t *dst[], int dstStride[],
int dstSliceY, int dstSliceH)
{
const int scale_dst = dstSliceY > 0 || dstSliceH < c->dstH;
/* load a few things into local vars to make the code more readable?
* and faster */
const int dstW = c->dstW;
int dstH = c->dstH;
const enum AVPixelFormat dstFormat = c->dstFormat;
const int flags = c->flags;
int32_t *vLumFilterPos = c->vLumFilterPos;
int32_t *vChrFilterPos = c->vChrFilterPos;
const int vLumFilterSize = c->vLumFilterSize;
const int vChrFilterSize = c->vChrFilterSize;
yuv2planar1_fn yuv2plane1 = c->yuv2plane1;
yuv2planarX_fn yuv2planeX = c->yuv2planeX;
yuv2interleavedX_fn yuv2nv12cX = c->yuv2nv12cX;
yuv2packed1_fn yuv2packed1 = c->yuv2packed1;
yuv2packed2_fn yuv2packed2 = c->yuv2packed2;
yuv2packedX_fn yuv2packedX = c->yuv2packedX;
yuv2anyX_fn yuv2anyX = c->yuv2anyX;
const int chrSrcSliceY = srcSliceY >> c->chrSrcVSubSample;
const int chrSrcSliceH = AV_CEIL_RSHIFT(srcSliceH, c->chrSrcVSubSample);
int should_dither = isNBPS(c->srcFormat) ||
is16BPS(c->srcFormat);
int lastDstY;
/* vars which will change and which we need to store back in the context */
int dstY = c->dstY;
int lastInLumBuf = c->lastInLumBuf;
int lastInChrBuf = c->lastInChrBuf;
int lumStart = 0;
int lumEnd = c->descIndex[0];
int chrStart = lumEnd;
int chrEnd = c->descIndex[1];
int vStart = chrEnd;
int vEnd = c->numDesc;
SwsSlice *src_slice = &c->slice[lumStart];
SwsSlice *hout_slice = &c->slice[c->numSlice-2];
SwsSlice *vout_slice = &c->slice[c->numSlice-1];
SwsFilterDescriptor *desc = c->desc;
int needAlpha = c->needAlpha;
int hasLumHoles = 1;
int hasChrHoles = 1;
if (isPacked(c->srcFormat)) {
src[1] =
src[2] =
src[3] = src[0];
srcStride[1] =
srcStride[2] =
srcStride[3] = srcStride[0];
}
srcStride[1] *= 1 << c->vChrDrop;
srcStride[2] *= 1 << c->vChrDrop;
DEBUG_BUFFERS("swscale() %p[%d] %p[%d] %p[%d] %p[%d] -> %p[%d] %p[%d] %p[%d] %p[%d]\n",
src[0], srcStride[0], src[1], srcStride[1],
src[2], srcStride[2], src[3], srcStride[3],
dst[0], dstStride[0], dst[1], dstStride[1],
dst[2], dstStride[2], dst[3], dstStride[3]);
DEBUG_BUFFERS("srcSliceY: %d srcSliceH: %d dstY: %d dstH: %d\n",
srcSliceY, srcSliceH, dstY, dstH);
DEBUG_BUFFERS("vLumFilterSize: %d vChrFilterSize: %d\n",
vLumFilterSize, vChrFilterSize);
if (dstStride[0]&15 || dstStride[1]&15 ||
dstStride[2]&15 || dstStride[3]&15) {
SwsContext *const ctx = c->parent ? c->parent : c;
if (flags & SWS_PRINT_INFO &&
!atomic_exchange_explicit(&ctx->stride_unaligned_warned, 1, memory_order_relaxed)) {
av_log(c, AV_LOG_WARNING,
"Warning: dstStride is not aligned!\n"
" ->cannot do aligned memory accesses anymore\n");
}
}
#if ARCH_X86
if ( (uintptr_t)dst[0]&15 || (uintptr_t)dst[1]&15 || (uintptr_t)dst[2]&15
|| (uintptr_t)src[0]&15 || (uintptr_t)src[1]&15 || (uintptr_t)src[2]&15
|| dstStride[0]&15 || dstStride[1]&15 || dstStride[2]&15 || dstStride[3]&15
|| srcStride[0]&15 || srcStride[1]&15 || srcStride[2]&15 || srcStride[3]&15
) {
SwsContext *const ctx = c->parent ? c->parent : c;
int cpu_flags = av_get_cpu_flags();
if (flags & SWS_PRINT_INFO && HAVE_MMXEXT && (cpu_flags & AV_CPU_FLAG_SSE2) &&
!atomic_exchange_explicit(&ctx->stride_unaligned_warned,1, memory_order_relaxed)) {
av_log(c, AV_LOG_WARNING, "Warning: data is not aligned! This can lead to a speed loss\n");
}
}
#endif
if (scale_dst) {
dstY = dstSliceY;
dstH = dstY + dstSliceH;
lastInLumBuf = -1;
lastInChrBuf = -1;
} else if (srcSliceY == 0) {
/* Note the user might start scaling the picture in the middle so this
* will not get executed. This is not really intended but works
* currently, so people might do it. */
dstY = 0;
lastInLumBuf = -1;
lastInChrBuf = -1;
}
if (!should_dither) {
c->chrDither8 = c->lumDither8 = sws_pb_64;
}
lastDstY = dstY;
ff_init_vscale_pfn(c, yuv2plane1, yuv2planeX, yuv2nv12cX,
yuv2packed1, yuv2packed2, yuv2packedX, yuv2anyX, c->use_mmx_vfilter);
ff_init_slice_from_src(src_slice, (uint8_t**)src, srcStride, c->srcW,
srcSliceY, srcSliceH, chrSrcSliceY, chrSrcSliceH, 1);
ff_init_slice_from_src(vout_slice, (uint8_t**)dst, dstStride, c->dstW,
dstY, dstSliceH, dstY >> c->chrDstVSubSample,
AV_CEIL_RSHIFT(dstSliceH, c->chrDstVSubSample), scale_dst);
if (srcSliceY == 0) {
hout_slice->plane[0].sliceY = lastInLumBuf + 1;
hout_slice->plane[1].sliceY = lastInChrBuf + 1;
hout_slice->plane[2].sliceY = lastInChrBuf + 1;
hout_slice->plane[3].sliceY = lastInLumBuf + 1;
hout_slice->plane[0].sliceH =
hout_slice->plane[1].sliceH =
hout_slice->plane[2].sliceH =
hout_slice->plane[3].sliceH = 0;
hout_slice->width = dstW;
}
for (; dstY < dstH; dstY++) {
const int chrDstY = dstY >> c->chrDstVSubSample;
int use_mmx_vfilter= c->use_mmx_vfilter;
// First line needed as input
const int firstLumSrcY = FFMAX(1 - vLumFilterSize, vLumFilterPos[dstY]);
const int firstLumSrcY2 = FFMAX(1 - vLumFilterSize, vLumFilterPos[FFMIN(dstY | ((1 << c->chrDstVSubSample) - 1), c->dstH - 1)]);
// First line needed as input
const int firstChrSrcY = FFMAX(1 - vChrFilterSize, vChrFilterPos[chrDstY]);
// Last line needed as input
int lastLumSrcY = FFMIN(c->srcH, firstLumSrcY + vLumFilterSize) - 1;
int lastLumSrcY2 = FFMIN(c->srcH, firstLumSrcY2 + vLumFilterSize) - 1;
int lastChrSrcY = FFMIN(c->chrSrcH, firstChrSrcY + vChrFilterSize) - 1;
int enough_lines;
int i;
int posY, cPosY, firstPosY, lastPosY, firstCPosY, lastCPosY;
// handle holes (FAST_BILINEAR & weird filters)
if (firstLumSrcY > lastInLumBuf) {
hasLumHoles = lastInLumBuf != firstLumSrcY - 1;
if (hasLumHoles) {
hout_slice->plane[0].sliceY = firstLumSrcY;
hout_slice->plane[3].sliceY = firstLumSrcY;
hout_slice->plane[0].sliceH =
hout_slice->plane[3].sliceH = 0;
}
lastInLumBuf = firstLumSrcY - 1;
}
if (firstChrSrcY > lastInChrBuf) {
hasChrHoles = lastInChrBuf != firstChrSrcY - 1;
if (hasChrHoles) {
hout_slice->plane[1].sliceY = firstChrSrcY;
hout_slice->plane[2].sliceY = firstChrSrcY;
hout_slice->plane[1].sliceH =
hout_slice->plane[2].sliceH = 0;
}
lastInChrBuf = firstChrSrcY - 1;
}
DEBUG_BUFFERS("dstY: %d\n", dstY);
DEBUG_BUFFERS("\tfirstLumSrcY: %d lastLumSrcY: %d lastInLumBuf: %d\n",
firstLumSrcY, lastLumSrcY, lastInLumBuf);
DEBUG_BUFFERS("\tfirstChrSrcY: %d lastChrSrcY: %d lastInChrBuf: %d\n",
firstChrSrcY, lastChrSrcY, lastInChrBuf);
// Do we have enough lines in this slice to output the dstY line
enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&
lastChrSrcY < AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample);
if (!enough_lines) {
lastLumSrcY = srcSliceY + srcSliceH - 1;
lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;
DEBUG_BUFFERS("buffering slice: lastLumSrcY %d lastChrSrcY %d\n",
lastLumSrcY, lastChrSrcY);
}
av_assert0((lastLumSrcY - firstLumSrcY + 1) <= hout_slice->plane[0].available_lines);
av_assert0((lastChrSrcY - firstChrSrcY + 1) <= hout_slice->plane[1].available_lines);
posY = hout_slice->plane[0].sliceY + hout_slice->plane[0].sliceH;
if (posY <= lastLumSrcY && !hasLumHoles) {
firstPosY = FFMAX(firstLumSrcY, posY);
lastPosY = FFMIN(firstLumSrcY + hout_slice->plane[0].available_lines - 1, srcSliceY + srcSliceH - 1);
} else {
firstPosY = posY;
lastPosY = lastLumSrcY;
}
cPosY = hout_slice->plane[1].sliceY + hout_slice->plane[1].sliceH;
if (cPosY <= lastChrSrcY && !hasChrHoles) {
firstCPosY = FFMAX(firstChrSrcY, cPosY);
lastCPosY = FFMIN(firstChrSrcY + hout_slice->plane[1].available_lines - 1, AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample) - 1);
} else {
firstCPosY = cPosY;
lastCPosY = lastChrSrcY;
}
ff_rotate_slice(hout_slice, lastPosY, lastCPosY);
if (posY < lastLumSrcY + 1) {
for (i = lumStart; i < lumEnd; ++i)
desc[i].process(c, &desc[i], firstPosY, lastPosY - firstPosY + 1);
}
lastInLumBuf = lastLumSrcY;
if (cPosY < lastChrSrcY + 1) {
for (i = chrStart; i < chrEnd; ++i)
desc[i].process(c, &desc[i], firstCPosY, lastCPosY - firstCPosY + 1);
}
lastInChrBuf = lastChrSrcY;
if (!enough_lines)
break; // we can't output a dstY line so let's try with the next slice
#if HAVE_MMX_INLINE
ff_updateMMXDitherTables(c, dstY);
#endif
if (should_dither) {
c->chrDither8 = ff_dither_8x8_128[chrDstY & 7];
c->lumDither8 = ff_dither_8x8_128[dstY & 7];
}
if (dstY >= c->dstH - 2) {
/* hmm looks like we can't use MMX here without overwriting
* this array's tail */
ff_sws_init_output_funcs(c, &yuv2plane1, &yuv2planeX, &yuv2nv12cX,
&yuv2packed1, &yuv2packed2, &yuv2packedX, &yuv2anyX);
use_mmx_vfilter= 0;
ff_init_vscale_pfn(c, yuv2plane1, yuv2planeX, yuv2nv12cX,
yuv2packed1, yuv2packed2, yuv2packedX, yuv2anyX, use_mmx_vfilter);
}
for (i = vStart; i < vEnd; ++i)
desc[i].process(c, &desc[i], dstY, 1);
}
if (isPlanar(dstFormat) && isALPHA(dstFormat) && !needAlpha) {
int offset = lastDstY - dstSliceY;
int length = dstW;
int height = dstY - lastDstY;
if (is16BPS(dstFormat) || isNBPS(dstFormat)) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(dstFormat);
fillPlane16(dst[3], dstStride[3], length, height, offset,
1, desc->comp[3].depth,
isBE(dstFormat));
} else if (is32BPS(dstFormat)) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(dstFormat);
fillPlane32(dst[3], dstStride[3], length, height, offset,
1, desc->comp[3].depth,
isBE(dstFormat), desc->flags & AV_PIX_FMT_FLAG_FLOAT);
} else
fillPlane(dst[3], dstStride[3], length, height, offset, 255);
}
#if HAVE_MMXEXT_INLINE
if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)
__asm__ volatile ("sfence" ::: "memory");
#endif
emms_c();
/* store changed local vars back in the context */
c->dstY = dstY;
c->lastInLumBuf = lastInLumBuf;
c->lastInChrBuf = lastInChrBuf;
return dstY - lastDstY;
}
av_cold void ff_sws_init_range_convert(SwsContext *c)
{
c->lumConvertRange = NULL;
c->chrConvertRange = NULL;
if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {
if (c->dstBpc <= 14) {
if (c->srcRange) {
c->lumConvertRange = lumRangeFromJpeg_c;
c->chrConvertRange = chrRangeFromJpeg_c;
} else {
c->lumConvertRange = lumRangeToJpeg_c;
c->chrConvertRange = chrRangeToJpeg_c;
}
} else {
if (c->srcRange) {
c->lumConvertRange = lumRangeFromJpeg16_c;
c->chrConvertRange = chrRangeFromJpeg16_c;
} else {
c->lumConvertRange = lumRangeToJpeg16_c;
c->chrConvertRange = chrRangeToJpeg16_c;
}
}
}
}
static av_cold void sws_init_swscale(SwsContext *c)
{
enum AVPixelFormat srcFormat = c->srcFormat;
ff_sws_init_output_funcs(c, &c->yuv2plane1, &c->yuv2planeX,
&c->yuv2nv12cX, &c->yuv2packed1,
&c->yuv2packed2, &c->yuv2packedX, &c->yuv2anyX);
ff_sws_init_input_funcs(c);
if (c->srcBpc == 8) {
if (c->dstBpc <= 14) {
c->hyScale = c->hcScale = hScale8To15_c;
if (c->flags & SWS_FAST_BILINEAR) {
c->hyscale_fast = ff_hyscale_fast_c;
c->hcscale_fast = ff_hcscale_fast_c;
}
} else {
c->hyScale = c->hcScale = hScale8To19_c;
}
} else {
c->hyScale = c->hcScale = c->dstBpc > 14 ? hScale16To19_c
: hScale16To15_c;
}
ff_sws_init_range_convert(c);
if (!(isGray(srcFormat) || isGray(c->dstFormat) ||
srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))
c->needs_hcscale = 1;
}
void ff_sws_init_scale(SwsContext *c)
{
sws_init_swscale(c);
#if ARCH_PPC
ff_sws_init_swscale_ppc(c);
#elif ARCH_X86
ff_sws_init_swscale_x86(c);
#elif ARCH_AARCH64
ff_sws_init_swscale_aarch64(c);
#elif ARCH_ARM
ff_sws_init_swscale_arm(c);
#elif ARCH_LOONGARCH64
ff_sws_init_swscale_loongarch(c);
#endif
}
static void reset_ptr(const uint8_t *src[], enum AVPixelFormat format)
{
if (!isALPHA(format))
src[3] = NULL;
if (!isPlanar(format)) {
src[3] = src[2] = NULL;
if (!usePal(format))
src[1] = NULL;
}
}
static int check_image_pointers(const uint8_t * const data[4], enum AVPixelFormat pix_fmt,
const int linesizes[4])
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
int i;
av_assert2(desc);
for (i = 0; i < 4; i++) {
int plane = desc->comp[i].plane;
if (!data[plane] || !linesizes[plane])
return 0;
}
return 1;
}
static void xyz12Torgb48(struct SwsContext *c, uint16_t *dst,
const uint16_t *src, int stride, int h)
{
int xp,yp;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
for (yp=0; yp<h; yp++) {
for (xp=0; xp+2<stride; xp+=3) {
int x, y, z, r, g, b;
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
x = AV_RB16(src + xp + 0);
y = AV_RB16(src + xp + 1);
z = AV_RB16(src + xp + 2);
} else {
x = AV_RL16(src + xp + 0);
y = AV_RL16(src + xp + 1);
z = AV_RL16(src + xp + 2);
}
x = c->xyzgamma[x>>4];
y = c->xyzgamma[y>>4];
z = c->xyzgamma[z>>4];
// convert from XYZlinear to sRGBlinear
r = c->xyz2rgb_matrix[0][0] * x +
c->xyz2rgb_matrix[0][1] * y +
c->xyz2rgb_matrix[0][2] * z >> 12;
g = c->xyz2rgb_matrix[1][0] * x +
c->xyz2rgb_matrix[1][1] * y +
c->xyz2rgb_matrix[1][2] * z >> 12;
b = c->xyz2rgb_matrix[2][0] * x +
c->xyz2rgb_matrix[2][1] * y +
c->xyz2rgb_matrix[2][2] * z >> 12;
// limit values to 12-bit depth
r = av_clip_uintp2(r, 12);
g = av_clip_uintp2(g, 12);
b = av_clip_uintp2(b, 12);
// convert from sRGBlinear to RGB and scale from 12bit to 16bit
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
AV_WB16(dst + xp + 0, c->rgbgamma[r] << 4);
AV_WB16(dst + xp + 1, c->rgbgamma[g] << 4);
AV_WB16(dst + xp + 2, c->rgbgamma[b] << 4);
} else {
AV_WL16(dst + xp + 0, c->rgbgamma[r] << 4);
AV_WL16(dst + xp + 1, c->rgbgamma[g] << 4);
AV_WL16(dst + xp + 2, c->rgbgamma[b] << 4);
}
}
src += stride;
dst += stride;
}
}
static void rgb48Toxyz12(struct SwsContext *c, uint16_t *dst,
const uint16_t *src, int stride, int h)
{
int xp,yp;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->dstFormat);
for (yp=0; yp<h; yp++) {
for (xp=0; xp+2<stride; xp+=3) {
int x, y, z, r, g, b;
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
r = AV_RB16(src + xp + 0);
g = AV_RB16(src + xp + 1);
b = AV_RB16(src + xp + 2);
} else {
r = AV_RL16(src + xp + 0);
g = AV_RL16(src + xp + 1);
b = AV_RL16(src + xp + 2);
}
r = c->rgbgammainv[r>>4];
g = c->rgbgammainv[g>>4];
b = c->rgbgammainv[b>>4];
// convert from sRGBlinear to XYZlinear
x = c->rgb2xyz_matrix[0][0] * r +
c->rgb2xyz_matrix[0][1] * g +
c->rgb2xyz_matrix[0][2] * b >> 12;
y = c->rgb2xyz_matrix[1][0] * r +
c->rgb2xyz_matrix[1][1] * g +
c->rgb2xyz_matrix[1][2] * b >> 12;
z = c->rgb2xyz_matrix[2][0] * r +
c->rgb2xyz_matrix[2][1] * g +
c->rgb2xyz_matrix[2][2] * b >> 12;
// limit values to 12-bit depth
x = av_clip_uintp2(x, 12);
y = av_clip_uintp2(y, 12);
z = av_clip_uintp2(z, 12);
// convert from XYZlinear to X'Y'Z' and scale from 12bit to 16bit
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
AV_WB16(dst + xp + 0, c->xyzgammainv[x] << 4);
AV_WB16(dst + xp + 1, c->xyzgammainv[y] << 4);
AV_WB16(dst + xp + 2, c->xyzgammainv[z] << 4);
} else {
AV_WL16(dst + xp + 0, c->xyzgammainv[x] << 4);
AV_WL16(dst + xp + 1, c->xyzgammainv[y] << 4);
AV_WL16(dst + xp + 2, c->xyzgammainv[z] << 4);
}
}
src += stride;
dst += stride;
}
}
static void update_palette(SwsContext *c, const uint32_t *pal)
{
for (int i = 0; i < 256; i++) {
int r, g, b, y, u, v, a = 0xff;
if (c->srcFormat == AV_PIX_FMT_PAL8) {
uint32_t p = pal[i];
a = (p >> 24) & 0xFF;
r = (p >> 16) & 0xFF;
g = (p >> 8) & 0xFF;
b = p & 0xFF;
} else if (c->srcFormat == AV_PIX_FMT_RGB8) {
r = ( i >> 5 ) * 36;
g = ((i >> 2) & 7) * 36;
b = ( i & 3) * 85;
} else if (c->srcFormat == AV_PIX_FMT_BGR8) {
b = ( i >> 6 ) * 85;
g = ((i >> 3) & 7) * 36;
r = ( i & 7) * 36;
} else if (c->srcFormat == AV_PIX_FMT_RGB4_BYTE) {
r = ( i >> 3 ) * 255;
g = ((i >> 1) & 3) * 85;
b = ( i & 1) * 255;
} else if (c->srcFormat == AV_PIX_FMT_GRAY8 || c->srcFormat == AV_PIX_FMT_GRAY8A) {
r = g = b = i;
} else {
av_assert1(c->srcFormat == AV_PIX_FMT_BGR4_BYTE);
b = ( i >> 3 ) * 255;
g = ((i >> 1) & 3) * 85;
r = ( i & 1) * 255;
}
#define RGB2YUV_SHIFT 15
#define BY ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define BV (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define BU ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define GY ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define GV (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define GU (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define RY ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define RV ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
#define RU (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
c->pal_yuv[i]= y + (u<<8) + (v<<16) + ((unsigned)a<<24);
switch (c->dstFormat) {
case AV_PIX_FMT_BGR32:
#if !HAVE_BIGENDIAN
case AV_PIX_FMT_RGB24:
#endif
c->pal_rgb[i]= r + (g<<8) + (b<<16) + ((unsigned)a<<24);
break;
case AV_PIX_FMT_BGR32_1:
#if HAVE_BIGENDIAN
case AV_PIX_FMT_BGR24:
#endif
c->pal_rgb[i]= a + (r<<8) + (g<<16) + ((unsigned)b<<24);
break;
case AV_PIX_FMT_RGB32_1:
#if HAVE_BIGENDIAN
case AV_PIX_FMT_RGB24:
#endif
c->pal_rgb[i]= a + (b<<8) + (g<<16) + ((unsigned)r<<24);
break;
case AV_PIX_FMT_RGB32:
#if !HAVE_BIGENDIAN
case AV_PIX_FMT_BGR24:
#endif
default:
c->pal_rgb[i]= b + (g<<8) + (r<<16) + ((unsigned)a<<24);
}
}
}
static int scale_internal(SwsContext *c,
const uint8_t * const srcSlice[], const int srcStride[],
int srcSliceY, int srcSliceH,
uint8_t *const dstSlice[], const int dstStride[],
int dstSliceY, int dstSliceH);
static int scale_gamma(SwsContext *c,
const uint8_t * const srcSlice[], const int srcStride[],
int srcSliceY, int srcSliceH,
uint8_t * const dstSlice[], const int dstStride[],
int dstSliceY, int dstSliceH)
{
int ret = scale_internal(c->cascaded_context[0],
srcSlice, srcStride, srcSliceY, srcSliceH,
c->cascaded_tmp, c->cascaded_tmpStride, 0, c->srcH);
if (ret < 0)
return ret;
if (c->cascaded_context[2])
ret = scale_internal(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp,
c->cascaded_tmpStride, srcSliceY, srcSliceH,
c->cascaded1_tmp, c->cascaded1_tmpStride, 0, c->dstH);
else
ret = scale_internal(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp,
c->cascaded_tmpStride, srcSliceY, srcSliceH,
dstSlice, dstStride, dstSliceY, dstSliceH);
if (ret < 0)
return ret;
if (c->cascaded_context[2]) {
ret = scale_internal(c->cascaded_context[2], (const uint8_t * const *)c->cascaded1_tmp,
c->cascaded1_tmpStride, c->cascaded_context[1]->dstY - ret,
c->cascaded_context[1]->dstY,
dstSlice, dstStride, dstSliceY, dstSliceH);
}
return ret;
}
static int scale_cascaded(SwsContext *c,
const uint8_t * const srcSlice[], const int srcStride[],
int srcSliceY, int srcSliceH,
uint8_t * const dstSlice[], const int dstStride[],
int dstSliceY, int dstSliceH)
{
int ret = scale_internal(c->cascaded_context[0],
srcSlice, srcStride, srcSliceY, srcSliceH,
c->cascaded_tmp, c->cascaded_tmpStride,
0, c->cascaded_context[0]->dstH);
if (ret < 0)
return ret;
ret = scale_internal(c->cascaded_context[1],
(const uint8_t * const * )c->cascaded_tmp, c->cascaded_tmpStride,
0, c->cascaded_context[0]->dstH,
dstSlice, dstStride, dstSliceY, dstSliceH);
return ret;
}
static int scale_internal(SwsContext *c,
const uint8_t * const srcSlice[], const int srcStride[],
int srcSliceY, int srcSliceH,
uint8_t *const dstSlice[], const int dstStride[],
int dstSliceY, int dstSliceH)
{
const int scale_dst = dstSliceY > 0 || dstSliceH < c->dstH;
const int frame_start = scale_dst || !c->sliceDir;
int i, ret;
const uint8_t *src2[4];
uint8_t *dst2[4];
int macro_height_src = isBayer(c->srcFormat) ? 2 : (1 << c->chrSrcVSubSample);
int macro_height_dst = isBayer(c->dstFormat) ? 2 : (1 << c->chrDstVSubSample);
// copy strides, so they can safely be modified
int srcStride2[4];
int dstStride2[4];
int srcSliceY_internal = srcSliceY;
if (!srcStride || !dstStride || !dstSlice || !srcSlice) {
av_log(c, AV_LOG_ERROR, "One of the input parameters to sws_scale() is NULL, please check the calling code\n");
return AVERROR(EINVAL);
}
if ((srcSliceY & (macro_height_src - 1)) ||
((srcSliceH & (macro_height_src - 1)) && srcSliceY + srcSliceH != c->srcH) ||
srcSliceY + srcSliceH > c->srcH ||
(isBayer(c->srcFormat) && srcSliceH <= 1)) {
av_log(c, AV_LOG_ERROR, "Slice parameters %d, %d are invalid\n", srcSliceY, srcSliceH);
return AVERROR(EINVAL);
}
if ((dstSliceY & (macro_height_dst - 1)) ||
((dstSliceH & (macro_height_dst - 1)) && dstSliceY + dstSliceH != c->dstH) ||
dstSliceY + dstSliceH > c->dstH) {
av_log(c, AV_LOG_ERROR, "Slice parameters %d, %d are invalid\n", dstSliceY, dstSliceH);
return AVERROR(EINVAL);
}
if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {
av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
return AVERROR(EINVAL);
}
if (!check_image_pointers((const uint8_t* const*)dstSlice, c->dstFormat, dstStride)) {
av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
return AVERROR(EINVAL);
}
// do not mess up sliceDir if we have a "trailing" 0-size slice
if (srcSliceH == 0)
return 0;
if (c->gamma_flag && c->cascaded_context[0])
return scale_gamma(c, srcSlice, srcStride, srcSliceY, srcSliceH,
dstSlice, dstStride, dstSliceY, dstSliceH);
if (c->cascaded_context[0] && srcSliceY == 0 && srcSliceH == c->cascaded_context[0]->srcH)
return scale_cascaded(c, srcSlice, srcStride, srcSliceY, srcSliceH,
dstSlice, dstStride, dstSliceY, dstSliceH);
if (!srcSliceY && (c->flags & SWS_BITEXACT) && c->dither == SWS_DITHER_ED && c->dither_error[0])
for (i = 0; i < 4; i++)
memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));
if (usePal(c->srcFormat))
update_palette(c, (const uint32_t *)srcSlice[1]);
memcpy(src2, srcSlice, sizeof(src2));
memcpy(dst2, dstSlice, sizeof(dst2));
memcpy(srcStride2, srcStride, sizeof(srcStride2));
memcpy(dstStride2, dstStride, sizeof(dstStride2));
if (frame_start && !scale_dst) {
if (srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
return AVERROR(EINVAL);
}
c->sliceDir = (srcSliceY == 0) ? 1 : -1;
} else if (scale_dst)
c->sliceDir = 1;
if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {
uint8_t *base;
int x,y;
av_fast_malloc(&c->rgb0_scratch, &c->rgb0_scratch_allocated,
FFABS(srcStride[0]) * srcSliceH + 32);
if (!c->rgb0_scratch)
return AVERROR(ENOMEM);
base = srcStride[0] < 0 ? c->rgb0_scratch - srcStride[0] * (srcSliceH-1) :
c->rgb0_scratch;
for (y=0; y<srcSliceH; y++){
memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);
for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {
base[ srcStride[0]*y + x] = 0xFF;
}
}
src2[0] = base;
}
if (c->srcXYZ && !(c->dstXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {
uint8_t *base;
av_fast_malloc(&c->xyz_scratch, &c->xyz_scratch_allocated,
FFABS(srcStride[0]) * srcSliceH + 32);
if (!c->xyz_scratch)
return AVERROR(ENOMEM);
base = srcStride[0] < 0 ? c->xyz_scratch - srcStride[0] * (srcSliceH-1) :
c->xyz_scratch;
xyz12Torgb48(c, (uint16_t*)base, (const uint16_t*)src2[0], srcStride[0]/2, srcSliceH);
src2[0] = base;
}
if (c->sliceDir != 1) {
// slices go from bottom to top => we flip the image internally
for (i=0; i<4; i++) {
srcStride2[i] *= -1;
dstStride2[i] *= -1;
}
src2[0] += (srcSliceH - 1) * srcStride[0];
if (!usePal(c->srcFormat))
src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];
src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];
src2[3] += (srcSliceH - 1) * srcStride[3];
dst2[0] += ( c->dstH - 1) * dstStride[0];
dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];
dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];
dst2[3] += ( c->dstH - 1) * dstStride[3];
srcSliceY_internal = c->srcH-srcSliceY-srcSliceH;
}
reset_ptr(src2, c->srcFormat);
reset_ptr((void*)dst2, c->dstFormat);
if (c->convert_unscaled) {
int offset = srcSliceY_internal;
int slice_h = srcSliceH;
// for dst slice scaling, offset the pointers to match the unscaled API
if (scale_dst) {
av_assert0(offset == 0);
for (i = 0; i < 4 && src2[i]; i++) {
if (!src2[i] || (i > 0 && usePal(c->srcFormat)))
break;
src2[i] += (dstSliceY >> ((i == 1 || i == 2) ? c->chrSrcVSubSample : 0)) * srcStride2[i];
}
for (i = 0; i < 4 && dst2[i]; i++) {
if (!dst2[i] || (i > 0 && usePal(c->dstFormat)))
break;
dst2[i] -= (dstSliceY >> ((i == 1 || i == 2) ? c->chrDstVSubSample : 0)) * dstStride2[i];
}
offset = dstSliceY;
slice_h = dstSliceH;
}
ret = c->convert_unscaled(c, src2, srcStride2, offset, slice_h,
dst2, dstStride2);
if (scale_dst)
dst2[0] += dstSliceY * dstStride2[0];
} else {
ret = swscale(c, src2, srcStride2, srcSliceY_internal, srcSliceH,
dst2, dstStride2, dstSliceY, dstSliceH);
}
if (c->dstXYZ && !(c->srcXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {
uint16_t *dst16;
if (scale_dst) {
dst16 = (uint16_t *)dst2[0];
} else {
int dstY = c->dstY ? c->dstY : srcSliceY + srcSliceH;
av_assert0(dstY >= ret);
av_assert0(ret >= 0);
av_assert0(c->dstH >= dstY);
dst16 = (uint16_t*)(dst2[0] + (dstY - ret) * dstStride2[0]);
}
/* replace on the same data */
rgb48Toxyz12(c, dst16, dst16, dstStride2[0]/2, ret);
}
/* reset slice direction at end of frame */
if ((srcSliceY_internal + srcSliceH == c->srcH) || scale_dst)
c->sliceDir = 0;
return ret;
}
void sws_frame_end(struct SwsContext *c)
{
av_frame_unref(c->frame_src);
av_frame_unref(c->frame_dst);
c->src_ranges.nb_ranges = 0;
}
int sws_frame_start(struct SwsContext *c, AVFrame *dst, const AVFrame *src)
{
int ret, allocated = 0;
ret = av_frame_ref(c->frame_src, src);
if (ret < 0)
return ret;
if (!dst->buf[0]) {
dst->width = c->dstW;
dst->height = c->dstH;
dst->format = c->dstFormat;
ret = av_frame_get_buffer(dst, 0);
if (ret < 0)
return ret;
allocated = 1;
}
ret = av_frame_ref(c->frame_dst, dst);
if (ret < 0) {
if (allocated)
av_frame_unref(dst);
return ret;
}
return 0;
}
int sws_send_slice(struct SwsContext *c, unsigned int slice_start,
unsigned int slice_height)
{
int ret;
ret = ff_range_add(&c->src_ranges, slice_start, slice_height);
if (ret < 0)
return ret;
return 0;
}
unsigned int sws_receive_slice_alignment(const struct SwsContext *c)
{
if (c->slice_ctx)
return c->slice_ctx[0]->dst_slice_align;
return c->dst_slice_align;
}
int sws_receive_slice(struct SwsContext *c, unsigned int slice_start,
unsigned int slice_height)
{
unsigned int align = sws_receive_slice_alignment(c);
uint8_t *dst[4];
/* wait until complete input has been received */
if (!(c->src_ranges.nb_ranges == 1 &&
c->src_ranges.ranges[0].start == 0 &&
c->src_ranges.ranges[0].len == c->srcH))
return AVERROR(EAGAIN);
if ((slice_start > 0 || slice_height < c->dstH) &&
(slice_start % align || slice_height % align)) {
av_log(c, AV_LOG_ERROR,
"Incorrectly aligned output: %u/%u not multiples of %u\n",
slice_start, slice_height, align);
return AVERROR(EINVAL);
}
if (c->slicethread) {
int nb_jobs = c->slice_ctx[0]->dither == SWS_DITHER_ED ? 1 : c->nb_slice_ctx;
int ret = 0;
c->dst_slice_start = slice_start;
c->dst_slice_height = slice_height;
avpriv_slicethread_execute(c->slicethread, nb_jobs, 0);
for (int i = 0; i < c->nb_slice_ctx; i++) {
if (c->slice_err[i] < 0) {
ret = c->slice_err[i];
break;
}
}
memset(c->slice_err, 0, c->nb_slice_ctx * sizeof(*c->slice_err));
return ret;
}
for (int i = 0; i < FF_ARRAY_ELEMS(dst); i++) {
ptrdiff_t offset = c->frame_dst->linesize[i] * (slice_start >> c->chrDstVSubSample);
dst[i] = FF_PTR_ADD(c->frame_dst->data[i], offset);
}
return scale_internal(c, (const uint8_t * const *)c->frame_src->data,
c->frame_src->linesize, 0, c->srcH,
dst, c->frame_dst->linesize, slice_start, slice_height);
}
int sws_scale_frame(struct SwsContext *c, AVFrame *dst, const AVFrame *src)
{
int ret;
ret = sws_frame_start(c, dst, src);
if (ret < 0)
return ret;
ret = sws_send_slice(c, 0, src->height);
if (ret >= 0)
ret = sws_receive_slice(c, 0, dst->height);
sws_frame_end(c);
return ret;
}
/**
* swscale wrapper, so we don't need to export the SwsContext.
* Assumes planar YUV to be in YUV order instead of YVU.
*/
int attribute_align_arg sws_scale(struct SwsContext *c,
const uint8_t * const srcSlice[],
const int srcStride[], int srcSliceY,
int srcSliceH, uint8_t *const dst[],
const int dstStride[])
{
if (c->nb_slice_ctx)
c = c->slice_ctx[0];
return scale_internal(c, srcSlice, srcStride, srcSliceY, srcSliceH,
dst, dstStride, 0, c->dstH);
}
void ff_sws_slice_worker(void *priv, int jobnr, int threadnr,
int nb_jobs, int nb_threads)
{
SwsContext *parent = priv;
SwsContext *c = parent->slice_ctx[threadnr];
const int slice_height = FFALIGN(FFMAX((parent->dst_slice_height + nb_jobs - 1) / nb_jobs, 1),
c->dst_slice_align);
const int slice_start = jobnr * slice_height;
const int slice_end = FFMIN((jobnr + 1) * slice_height, parent->dst_slice_height);
int err = 0;
if (slice_end > slice_start) {
uint8_t *dst[4] = { NULL };
for (int i = 0; i < FF_ARRAY_ELEMS(dst) && parent->frame_dst->data[i]; i++) {
const int vshift = (i == 1 || i == 2) ? c->chrDstVSubSample : 0;
const ptrdiff_t offset = parent->frame_dst->linesize[i] *
((slice_start + parent->dst_slice_start) >> vshift);
dst[i] = parent->frame_dst->data[i] + offset;
}
err = scale_internal(c, (const uint8_t * const *)parent->frame_src->data,
parent->frame_src->linesize, 0, c->srcH,
dst, parent->frame_dst->linesize,
parent->dst_slice_start + slice_start, slice_end - slice_start);
}
parent->slice_err[threadnr] = err;
}
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