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ffmpeg/libswscale/vscale.c
Niklas Haas 67adb30322 swscale: rename SwsContext to SwsInternal 
And preserve the public SwsContext as separate name. The motivation here
is that I want to turn SwsContext into a public struct, while keeping the
internal implementation hidden. Additionally, I also want to be able to
use multiple internal implementations, e.g. for GPU devices.

This commit does not include any functional changes. For the most part, it is
a simple rename. The only complications arise from the public facing API
functions, which preserve their current type (and hence require an additional
unwrapping step internally), and the checkasm test framework, which directly
accesses SwsInternal.

For consistency, the affected functions that need to maintain a distionction
have generally been changed to refer to the SwsContext as *sws, and the
SwsInternal as *c.

In an upcoming commit, I will provide a backing definition for the public
SwsContext, and update `sws_internal()` to dereference the internal struct
instead of merely casting it.

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
2024-10-24 22:50:00 +02:00

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/*
* Copyright (C) 2015 Pedro Arthur <bygrandao@gmail.com>
*
* 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 "libavutil/mem.h"
#include "swscale_internal.h"
typedef struct VScalerContext
{
uint16_t *filter[2];
int32_t *filter_pos;
int filter_size;
int isMMX;
union {
yuv2planar1_fn yuv2planar1;
yuv2planarX_fn yuv2planarX;
yuv2interleavedX_fn yuv2interleavedX;
yuv2packed1_fn yuv2packed1;
yuv2packed2_fn yuv2packed2;
yuv2anyX_fn yuv2anyX;
} pfn;
yuv2packedX_fn yuv2packedX;
} VScalerContext;
static int lum_planar_vscale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
VScalerContext *inst = desc->instance;
int dstW = desc->dst->width;
int first = FFMAX(1-inst->filter_size, inst->filter_pos[sliceY]);
int sp = first - desc->src->plane[0].sliceY;
int dp = sliceY - desc->dst->plane[0].sliceY;
uint8_t **src = desc->src->plane[0].line + sp;
uint8_t **dst = desc->dst->plane[0].line + dp;
uint16_t *filter = inst->filter[0] + (inst->isMMX ? 0 : sliceY * inst->filter_size);
if (inst->filter_size == 1)
inst->pfn.yuv2planar1((const int16_t*)src[0], dst[0], dstW, c->lumDither8, 0);
else
inst->pfn.yuv2planarX(filter, inst->filter_size, (const int16_t**)src, dst[0], dstW, c->lumDither8, 0);
if (desc->alpha) {
int sp = first - desc->src->plane[3].sliceY;
int dp = sliceY - desc->dst->plane[3].sliceY;
uint8_t **src = desc->src->plane[3].line + sp;
uint8_t **dst = desc->dst->plane[3].line + dp;
uint16_t *filter = inst->filter[1] + (inst->isMMX ? 0 : sliceY * inst->filter_size);
if (inst->filter_size == 1)
inst->pfn.yuv2planar1((const int16_t*)src[0], dst[0], dstW, c->lumDither8, 0);
else
inst->pfn.yuv2planarX(filter, inst->filter_size, (const int16_t**)src, dst[0], dstW, c->lumDither8, 0);
}
return 1;
}
static int chr_planar_vscale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
const int chrSkipMask = (1 << desc->dst->v_chr_sub_sample) - 1;
if (sliceY & chrSkipMask)
return 0;
else {
VScalerContext *inst = desc->instance;
int dstW = AV_CEIL_RSHIFT(desc->dst->width, desc->dst->h_chr_sub_sample);
int chrSliceY = sliceY >> desc->dst->v_chr_sub_sample;
int first = FFMAX(1-inst->filter_size, inst->filter_pos[chrSliceY]);
int sp1 = first - desc->src->plane[1].sliceY;
int sp2 = first - desc->src->plane[2].sliceY;
int dp1 = chrSliceY - desc->dst->plane[1].sliceY;
int dp2 = chrSliceY - desc->dst->plane[2].sliceY;
uint8_t **src1 = desc->src->plane[1].line + sp1;
uint8_t **src2 = desc->src->plane[2].line + sp2;
uint8_t **dst1 = desc->dst->plane[1].line + dp1;
uint8_t **dst2 = desc->dst->plane[2].line + dp2;
uint16_t *filter = inst->filter[0] + (inst->isMMX ? 0 : chrSliceY * inst->filter_size);
if (c->yuv2nv12cX) {
inst->pfn.yuv2interleavedX(c->dstFormat, c->chrDither8, filter, inst->filter_size, (const int16_t**)src1, (const int16_t**)src2, dst1[0], dstW);
} else if (inst->filter_size == 1) {
inst->pfn.yuv2planar1((const int16_t*)src1[0], dst1[0], dstW, c->chrDither8, 0);
inst->pfn.yuv2planar1((const int16_t*)src2[0], dst2[0], dstW, c->chrDither8, 3);
} else {
inst->pfn.yuv2planarX(filter, inst->filter_size, (const int16_t**)src1, dst1[0], dstW, c->chrDither8, 0);
inst->pfn.yuv2planarX(filter, inst->filter_size, (const int16_t**)src2, dst2[0], dstW, c->chrDither8, inst->isMMX ? (c->uv_offx2 >> 1) : 3);
}
}
return 1;
}
static int packed_vscale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
VScalerContext *inst = desc->instance;
int dstW = desc->dst->width;
int chrSliceY = sliceY >> desc->dst->v_chr_sub_sample;
int lum_fsize = inst[0].filter_size;
int chr_fsize = inst[1].filter_size;
uint16_t *lum_filter = inst[0].filter[0];
uint16_t *chr_filter = inst[1].filter[0];
int firstLum = FFMAX(1-lum_fsize, inst[0].filter_pos[ sliceY]);
int firstChr = FFMAX(1-chr_fsize, inst[1].filter_pos[chrSliceY]);
int sp0 = firstLum - desc->src->plane[0].sliceY;
int sp1 = firstChr - desc->src->plane[1].sliceY;
int sp2 = firstChr - desc->src->plane[2].sliceY;
int sp3 = firstLum - desc->src->plane[3].sliceY;
int dp = sliceY - desc->dst->plane[0].sliceY;
uint8_t **src0 = desc->src->plane[0].line + sp0;
uint8_t **src1 = desc->src->plane[1].line + sp1;
uint8_t **src2 = desc->src->plane[2].line + sp2;
uint8_t **src3 = desc->alpha ? desc->src->plane[3].line + sp3 : NULL;
uint8_t **dst = desc->dst->plane[0].line + dp;
if (c->yuv2packed1 && lum_fsize == 1 && chr_fsize == 1) { // unscaled RGB
inst->pfn.yuv2packed1(c, (const int16_t*)*src0, (const int16_t**)src1, (const int16_t**)src2,
(const int16_t*)(desc->alpha ? *src3 : NULL), *dst, dstW, 0, sliceY);
} else if (c->yuv2packed1 && lum_fsize == 1 && chr_fsize == 2 &&
chr_filter[2 * chrSliceY + 1] + chr_filter[2 * chrSliceY] == 4096 &&
chr_filter[2 * chrSliceY + 1] <= 4096U) { // unscaled RGB
int chrAlpha = chr_filter[2 * chrSliceY + 1];
inst->pfn.yuv2packed1(c, (const int16_t*)*src0, (const int16_t**)src1, (const int16_t**)src2,
(const int16_t*)(desc->alpha ? *src3 : NULL), *dst, dstW, chrAlpha, sliceY);
} else if (c->yuv2packed2 && lum_fsize == 2 && chr_fsize == 2 &&
lum_filter[2 * sliceY + 1] + lum_filter[2 * sliceY] == 4096 &&
lum_filter[2 * sliceY + 1] <= 4096U &&
chr_filter[2 * chrSliceY + 1] + chr_filter[2 * chrSliceY] == 4096 &&
chr_filter[2 * chrSliceY + 1] <= 4096U
) { // bilinear upscale RGB
int lumAlpha = lum_filter[2 * sliceY + 1];
int chrAlpha = chr_filter[2 * chrSliceY + 1];
c->lumMmxFilter[2] =
c->lumMmxFilter[3] = lum_filter[2 * sliceY] * 0x10001;
c->chrMmxFilter[2] =
c->chrMmxFilter[3] = chr_filter[2 * chrSliceY] * 0x10001;
inst->pfn.yuv2packed2(c, (const int16_t**)src0, (const int16_t**)src1, (const int16_t**)src2, (const int16_t**)src3,
*dst, dstW, lumAlpha, chrAlpha, sliceY);
} else { // general RGB
if ((c->yuv2packed1 && lum_fsize == 1 && chr_fsize == 2) ||
(c->yuv2packed2 && lum_fsize == 2 && chr_fsize == 2)) {
if (!c->warned_unuseable_bilinear)
av_log(c, AV_LOG_INFO, "Optimized 2 tap filter code cannot be used\n");
c->warned_unuseable_bilinear = 1;
}
inst->yuv2packedX(c, lum_filter + sliceY * lum_fsize,
(const int16_t**)src0, lum_fsize, chr_filter + chrSliceY * chr_fsize,
(const int16_t**)src1, (const int16_t**)src2, chr_fsize, (const int16_t**)src3, *dst, dstW, sliceY);
}
return 1;
}
static int any_vscale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
VScalerContext *inst = desc->instance;
int dstW = desc->dst->width;
int chrSliceY = sliceY >> desc->dst->v_chr_sub_sample;
int lum_fsize = inst[0].filter_size;
int chr_fsize = inst[1].filter_size;
uint16_t *lum_filter = inst[0].filter[0];
uint16_t *chr_filter = inst[1].filter[0];
int firstLum = FFMAX(1-lum_fsize, inst[0].filter_pos[ sliceY]);
int firstChr = FFMAX(1-chr_fsize, inst[1].filter_pos[chrSliceY]);
int sp0 = firstLum - desc->src->plane[0].sliceY;
int sp1 = firstChr - desc->src->plane[1].sliceY;
int sp2 = firstChr - desc->src->plane[2].sliceY;
int sp3 = firstLum - desc->src->plane[3].sliceY;
int dp0 = sliceY - desc->dst->plane[0].sliceY;
int dp1 = chrSliceY - desc->dst->plane[1].sliceY;
int dp2 = chrSliceY - desc->dst->plane[2].sliceY;
int dp3 = sliceY - desc->dst->plane[3].sliceY;
uint8_t **src0 = desc->src->plane[0].line + sp0;
uint8_t **src1 = desc->src->plane[1].line + sp1;
uint8_t **src2 = desc->src->plane[2].line + sp2;
uint8_t **src3 = desc->alpha ? desc->src->plane[3].line + sp3 : NULL;
uint8_t *dst[4] = { desc->dst->plane[0].line[dp0],
desc->dst->plane[1].line[dp1],
desc->dst->plane[2].line[dp2],
desc->alpha ? desc->dst->plane[3].line[dp3] : NULL };
av_assert1(!c->yuv2packed1 && !c->yuv2packed2);
inst->pfn.yuv2anyX(c, lum_filter + sliceY * lum_fsize,
(const int16_t**)src0, lum_fsize, chr_filter + sliceY * chr_fsize,
(const int16_t**)src1, (const int16_t**)src2, chr_fsize, (const int16_t**)src3, dst, dstW, sliceY);
return 1;
}
int ff_init_vscale(SwsInternal *c, SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst)
{
VScalerContext *lumCtx = NULL;
VScalerContext *chrCtx = NULL;
if (isPlanarYUV(c->dstFormat) || (isGray(c->dstFormat) && !isALPHA(c->dstFormat))) {
lumCtx = av_mallocz(sizeof(VScalerContext));
if (!lumCtx)
return AVERROR(ENOMEM);
desc[0].process = lum_planar_vscale;
desc[0].instance = lumCtx;
desc[0].src = src;
desc[0].dst = dst;
desc[0].alpha = c->needAlpha;
if (!isGray(c->dstFormat)) {
chrCtx = av_mallocz(sizeof(VScalerContext));
if (!chrCtx)
return AVERROR(ENOMEM);
desc[1].process = chr_planar_vscale;
desc[1].instance = chrCtx;
desc[1].src = src;
desc[1].dst = dst;
}
} else {
lumCtx = av_calloc(2, sizeof(*lumCtx));
if (!lumCtx)
return AVERROR(ENOMEM);
chrCtx = &lumCtx[1];
desc[0].process = c->yuv2packedX ? packed_vscale : any_vscale;
desc[0].instance = lumCtx;
desc[0].src = src;
desc[0].dst = dst;
desc[0].alpha = c->needAlpha;
}
ff_init_vscale_pfn(c, c->yuv2plane1, c->yuv2planeX, c->yuv2nv12cX,
c->yuv2packed1, c->yuv2packed2, c->yuv2packedX, c->yuv2anyX, c->use_mmx_vfilter);
return 0;
}
void ff_init_vscale_pfn(SwsInternal *c,
yuv2planar1_fn yuv2plane1,
yuv2planarX_fn yuv2planeX,
yuv2interleavedX_fn yuv2nv12cX,
yuv2packed1_fn yuv2packed1,
yuv2packed2_fn yuv2packed2,
yuv2packedX_fn yuv2packedX,
yuv2anyX_fn yuv2anyX, int use_mmx)
{
VScalerContext *lumCtx = NULL;
VScalerContext *chrCtx = NULL;
int idx = c->numDesc - (c->is_internal_gamma ? 2 : 1); //FIXME avoid hardcoding indexes
if (isPlanarYUV(c->dstFormat) || (isGray(c->dstFormat) && !isALPHA(c->dstFormat))) {
if (!isGray(c->dstFormat)) {
chrCtx = c->desc[idx].instance;
chrCtx->filter[0] = use_mmx ? (int16_t*)c->chrMmxFilter : c->vChrFilter;
chrCtx->filter_size = c->vChrFilterSize;
chrCtx->filter_pos = c->vChrFilterPos;
chrCtx->isMMX = use_mmx;
--idx;
if (yuv2nv12cX) chrCtx->pfn.yuv2interleavedX = yuv2nv12cX;
else if (c->vChrFilterSize == 1) chrCtx->pfn.yuv2planar1 = yuv2plane1;
else chrCtx->pfn.yuv2planarX = yuv2planeX;
}
lumCtx = c->desc[idx].instance;
lumCtx->filter[0] = use_mmx ? (int16_t*)c->lumMmxFilter : c->vLumFilter;
lumCtx->filter[1] = use_mmx ? (int16_t*)c->alpMmxFilter : c->vLumFilter;
lumCtx->filter_size = c->vLumFilterSize;
lumCtx->filter_pos = c->vLumFilterPos;
lumCtx->isMMX = use_mmx;
if (c->vLumFilterSize == 1) lumCtx->pfn.yuv2planar1 = yuv2plane1;
else lumCtx->pfn.yuv2planarX = yuv2planeX;
} else {
lumCtx = c->desc[idx].instance;
chrCtx = &lumCtx[1];
lumCtx->filter[0] = c->vLumFilter;
lumCtx->filter_size = c->vLumFilterSize;
lumCtx->filter_pos = c->vLumFilterPos;
chrCtx->filter[0] = c->vChrFilter;
chrCtx->filter_size = c->vChrFilterSize;
chrCtx->filter_pos = c->vChrFilterPos;
lumCtx->isMMX = use_mmx;
chrCtx->isMMX = use_mmx;
if (yuv2packedX) {
if (c->yuv2packed1 && c->vLumFilterSize == 1 && c->vChrFilterSize <= 2)
lumCtx->pfn.yuv2packed1 = yuv2packed1;
else if (c->yuv2packed2 && c->vLumFilterSize == 2 && c->vChrFilterSize == 2)
lumCtx->pfn.yuv2packed2 = yuv2packed2;
lumCtx->yuv2packedX = yuv2packedX;
} else
lumCtx->pfn.yuv2anyX = yuv2anyX;
}
}
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