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ffmpeg/libswscale/hscale.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"
/// Scaler instance data
typedef struct FilterContext
{
uint16_t *filter;
int *filter_pos;
int filter_size;
int xInc;
} FilterContext;
/// Color conversion instance data
typedef struct ColorContext
{
uint32_t *pal;
} ColorContext;
static int lum_h_scale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
FilterContext *instance = desc->instance;
int srcW = desc->src->width;
int dstW = desc->dst->width;
int xInc = instance->xInc;
int i;
for (i = 0; i < sliceH; ++i) {
uint8_t ** src = desc->src->plane[0].line;
uint8_t ** dst = desc->dst->plane[0].line;
int src_pos = sliceY+i - desc->src->plane[0].sliceY;
int dst_pos = sliceY+i - desc->dst->plane[0].sliceY;
if (c->hyscale_fast) {
c->hyscale_fast(c, (int16_t*)dst[dst_pos], dstW, src[src_pos], srcW, xInc);
} else {
c->hyScale(c, (int16_t*)dst[dst_pos], dstW, (const uint8_t *)src[src_pos], instance->filter,
instance->filter_pos, instance->filter_size);
}
if (c->lumConvertRange)
c->lumConvertRange((int16_t*)dst[dst_pos], dstW);
desc->dst->plane[0].sliceH += 1;
if (desc->alpha) {
src = desc->src->plane[3].line;
dst = desc->dst->plane[3].line;
src_pos = sliceY+i - desc->src->plane[3].sliceY;
dst_pos = sliceY+i - desc->dst->plane[3].sliceY;
desc->dst->plane[3].sliceH += 1;
if (c->hyscale_fast) {
c->hyscale_fast(c, (int16_t*)dst[dst_pos], dstW, src[src_pos], srcW, xInc);
} else {
c->hyScale(c, (int16_t*)dst[dst_pos], dstW, (const uint8_t *)src[src_pos], instance->filter,
instance->filter_pos, instance->filter_size);
}
}
}
return sliceH;
}
static int lum_convert(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
int srcW = desc->src->width;
ColorContext * instance = desc->instance;
uint32_t * pal = instance->pal;
int i;
desc->dst->plane[0].sliceY = sliceY;
desc->dst->plane[0].sliceH = sliceH;
desc->dst->plane[3].sliceY = sliceY;
desc->dst->plane[3].sliceH = sliceH;
for (i = 0; i < sliceH; ++i) {
int sp0 = sliceY+i - desc->src->plane[0].sliceY;
int sp1 = ((sliceY+i) >> desc->src->v_chr_sub_sample) - desc->src->plane[1].sliceY;
const uint8_t * src[4] = { desc->src->plane[0].line[sp0],
desc->src->plane[1].line[sp1],
desc->src->plane[2].line[sp1],
desc->src->plane[3].line[sp0]};
uint8_t * dst = desc->dst->plane[0].line[i];
if (c->lumToYV12) {
c->lumToYV12(dst, src[0], src[1], src[2], srcW, pal, c->input_opaque);
} else if (c->readLumPlanar) {
c->readLumPlanar(dst, src, srcW, c->input_rgb2yuv_table, c->input_opaque);
}
if (desc->alpha) {
dst = desc->dst->plane[3].line[i];
if (c->alpToYV12) {
c->alpToYV12(dst, src[3], src[1], src[2], srcW, pal, c->input_opaque);
} else if (c->readAlpPlanar) {
c->readAlpPlanar(dst, src, srcW, NULL, c->input_opaque);
}
}
}
return sliceH;
}
int ff_init_desc_fmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal)
{
ColorContext * li = av_malloc(sizeof(ColorContext));
if (!li)
return AVERROR(ENOMEM);
li->pal = pal;
desc->instance = li;
desc->alpha = isALPHA(src->fmt) && isALPHA(dst->fmt);
desc->src =src;
desc->dst = dst;
desc->process = &lum_convert;
return 0;
}
int ff_init_desc_hscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int * filter_pos, int filter_size, int xInc)
{
FilterContext *li = av_malloc(sizeof(FilterContext));
if (!li)
return AVERROR(ENOMEM);
li->filter = filter;
li->filter_pos = filter_pos;
li->filter_size = filter_size;
li->xInc = xInc;
desc->instance = li;
desc->alpha = isALPHA(src->fmt) && isALPHA(dst->fmt);
desc->src = src;
desc->dst = dst;
desc->process = &lum_h_scale;
return 0;
}
static int chr_h_scale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
FilterContext *instance = desc->instance;
int srcW = AV_CEIL_RSHIFT(desc->src->width, desc->src->h_chr_sub_sample);
int dstW = AV_CEIL_RSHIFT(desc->dst->width, desc->dst->h_chr_sub_sample);
int xInc = instance->xInc;
uint8_t ** src1 = desc->src->plane[1].line;
uint8_t ** dst1 = desc->dst->plane[1].line;
uint8_t ** src2 = desc->src->plane[2].line;
uint8_t ** dst2 = desc->dst->plane[2].line;
int src_pos1 = sliceY - desc->src->plane[1].sliceY;
int dst_pos1 = sliceY - desc->dst->plane[1].sliceY;
int src_pos2 = sliceY - desc->src->plane[2].sliceY;
int dst_pos2 = sliceY - desc->dst->plane[2].sliceY;
int i;
for (i = 0; i < sliceH; ++i) {
if (c->hcscale_fast) {
c->hcscale_fast(c, (uint16_t*)dst1[dst_pos1+i], (uint16_t*)dst2[dst_pos2+i], dstW, src1[src_pos1+i], src2[src_pos2+i], srcW, xInc);
} else {
c->hcScale(c, (uint16_t*)dst1[dst_pos1+i], dstW, src1[src_pos1+i], instance->filter, instance->filter_pos, instance->filter_size);
c->hcScale(c, (uint16_t*)dst2[dst_pos2+i], dstW, src2[src_pos2+i], instance->filter, instance->filter_pos, instance->filter_size);
}
if (c->chrConvertRange)
c->chrConvertRange((uint16_t*)dst1[dst_pos1+i], (uint16_t*)dst2[dst_pos2+i], dstW);
desc->dst->plane[1].sliceH += 1;
desc->dst->plane[2].sliceH += 1;
}
return sliceH;
}
static int chr_convert(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
int srcW = AV_CEIL_RSHIFT(desc->src->width, desc->src->h_chr_sub_sample);
ColorContext * instance = desc->instance;
uint32_t * pal = instance->pal;
int sp0 = (sliceY - (desc->src->plane[0].sliceY >> desc->src->v_chr_sub_sample)) << desc->src->v_chr_sub_sample;
int sp1 = sliceY - desc->src->plane[1].sliceY;
int i;
desc->dst->plane[1].sliceY = sliceY;
desc->dst->plane[1].sliceH = sliceH;
desc->dst->plane[2].sliceY = sliceY;
desc->dst->plane[2].sliceH = sliceH;
for (i = 0; i < sliceH; ++i) {
const uint8_t * src[4] = { desc->src->plane[0].line[sp0+i],
desc->src->plane[1].line[sp1+i],
desc->src->plane[2].line[sp1+i],
desc->src->plane[3].line[sp0+i]};
uint8_t * dst1 = desc->dst->plane[1].line[i];
uint8_t * dst2 = desc->dst->plane[2].line[i];
if (c->chrToYV12) {
c->chrToYV12(dst1, dst2, src[0], src[1], src[2], srcW, pal, c->input_opaque);
} else if (c->readChrPlanar) {
c->readChrPlanar(dst1, dst2, src, srcW, c->input_rgb2yuv_table, c->input_opaque);
}
}
return sliceH;
}
int ff_init_desc_cfmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal)
{
ColorContext * li = av_malloc(sizeof(ColorContext));
if (!li)
return AVERROR(ENOMEM);
li->pal = pal;
desc->instance = li;
desc->src =src;
desc->dst = dst;
desc->process = &chr_convert;
return 0;
}
int ff_init_desc_chscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int * filter_pos, int filter_size, int xInc)
{
FilterContext *li = av_malloc(sizeof(FilterContext));
if (!li)
return AVERROR(ENOMEM);
li->filter = filter;
li->filter_pos = filter_pos;
li->filter_size = filter_size;
li->xInc = xInc;
desc->instance = li;
desc->alpha = isALPHA(src->fmt) && isALPHA(dst->fmt);
desc->src = src;
desc->dst = dst;
desc->process = &chr_h_scale;
return 0;
}
static int no_chr_scale(SwsInternal *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
desc->dst->plane[1].sliceY = sliceY + sliceH - desc->dst->plane[1].available_lines;
desc->dst->plane[1].sliceH = desc->dst->plane[1].available_lines;
desc->dst->plane[2].sliceY = sliceY + sliceH - desc->dst->plane[2].available_lines;
desc->dst->plane[2].sliceH = desc->dst->plane[2].available_lines;
return 0;
}
int ff_init_desc_no_chr(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst)
{
desc->src = src;
desc->dst = dst;
desc->alpha = 0;
desc->instance = NULL;
desc->process = &no_chr_scale;
return 0;
}
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