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ffmpeg/libswscale/hscale.c

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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 "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(SwsContext *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(SwsContext *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);
} else if (c->readLumPlanar) {
c->readLumPlanar(dst, src, srcW, c->input_rgb2yuv_table);
}
if (desc->alpha) {
dst = desc->dst->plane[3].line[i];
if (c->alpToYV12) {
c->alpToYV12(dst, src[3], src[1], src[2], srcW, pal);
} else if (c->readAlpPlanar) {
c->readAlpPlanar(dst, src, srcW, NULL);
}
}
}
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(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
FilterContext *instance = desc->instance;
int srcW = FF_CEIL_RSHIFT(desc->src->width, desc->src->h_chr_sub_sample);
int dstW = FF_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(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
{
int srcW = FF_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);
} else if (c->readChrPlanar) {
c->readChrPlanar(dst1, dst2, src, srcW, c->input_rgb2yuv_table);
}
}
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(SwsContext *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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