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swscale: Add support to specify chroma position 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-07-14 05:19:44 +02:00
parent 53c853e049
commit b405f4e916
4 changed files with 37 additions and 10 deletions
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5
libswscale/options.c
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@ -64,6 +64,11 @@ static const AVOption options[] = {
{ "param0", "scaler param 0", OFFSET(param[0]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, VE },
{ "param1", "scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, VE },
{ "src_v_chr_pos", "source vertical chroma position in luma grid/256" , OFFSET(src_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 512, VE },
{ "src_h_chr_pos", "source horizontal chroma position in luma grid/256", OFFSET(src_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 512, VE },
{ "dst_v_chr_pos", "source vertical chroma position in luma grid/256" , OFFSET(dst_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 512, VE },
{ "dst_h_chr_pos", "source horizontal chroma position in luma grid/256", OFFSET(dst_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 512, VE },
{ NULL }
};

4
libswscale/swscale_internal.h
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@ -382,6 +382,10 @@ typedef struct SwsContext {
int dst0Alpha;
int srcXYZ;
int dstXYZ;
int src_h_chr_pos;
int dst_h_chr_pos;
int src_v_chr_pos;
int dst_v_chr_pos;
int yuv2rgb_y_offset;
int yuv2rgb_y_coeff;
int yuv2rgb_v2r_coeff;

36
libswscale/utils.c
View File

@ -252,12 +252,21 @@ static double getSplineCoeff(double a, double b, double c, double d,
dist - 1.0);
}
static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)
{
if (pos < 0) {
pos = (128 << chr_subsample) - 128;
}
pos += 128; // relative to ideal left edge
return pos >> chr_subsample;
}
static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
int *outFilterSize, int xInc, int srcW,
int dstW, int filterAlign, int one,
int flags, int cpu_flags,
SwsVector *srcFilter, SwsVector *dstFilter,
double param[2])
double param[2], int srcPos, int dstPos)
{
int i;
int filterSize;
@ -273,7 +282,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
// NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);
if (FFABS(xInc - 0x10000) < 10) { // unscaled
if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
int i;
filterSize = 1;
FF_ALLOCZ_OR_GOTO(NULL, filter,
@ -290,7 +299,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
FF_ALLOC_OR_GOTO(NULL, filter,
dstW * sizeof(*filter) * filterSize, fail);
xDstInSrc = xInc / 2 - 0x8000;
xDstInSrc = ((srcPos*xInc)>>8) - ((dstPos*0x8000)>>7);
for (i = 0; i < dstW; i++) {
int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
@ -306,7 +315,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
FF_ALLOC_OR_GOTO(NULL, filter,
dstW * sizeof(*filter) * filterSize, fail);
xDstInSrc = xInc / 2 - 0x8000;
xDstInSrc = ((srcPos*xInc)>>8) - ((dstPos*0x8000)>>7);
for (i = 0; i < dstW; i++) {
int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
int j;
@ -357,7 +366,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
FF_ALLOC_OR_GOTO(NULL, filter,
dstW * sizeof(*filter) * filterSize, fail);
xDstInSrc = xInc - 0x10000;
xDstInSrc = ((srcPos*xInc)>>7) - ((dstPos*0x10000)>>7);
for (i = 0; i < dstW; i++) {
int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);
int j;
@ -1392,14 +1401,18 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
srcW, dstW, filterAlign, 1 << 14,
(flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
cpu_flags, srcFilter->lumH, dstFilter->lumH,
c->param) < 0)
c->param,
get_local_pos(c, 0, 0, 0),
get_local_pos(c, 0, 0, 0)) < 0)
goto fail;
if (initFilter(&c->hChrFilter, &c->hChrFilterPos,
&c->hChrFilterSize, c->chrXInc,
c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
(flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
cpu_flags, srcFilter->chrH, dstFilter->chrH,
c->param) < 0)
c->param,
get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)
goto fail;
}
} // initialize horizontal stuff
@ -1415,14 +1428,19 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
(flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
cpu_flags, srcFilter->lumV, dstFilter->lumV,
c->param) < 0)
c->param,
get_local_pos(c, 0, 0, 1),
get_local_pos(c, 0, 0, 1)) < 0)
goto fail;
if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
c->chrYInc, c->chrSrcH, c->chrDstH,
filterAlign, (1 << 12),
(flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
cpu_flags, srcFilter->chrV, dstFilter->chrV,
c->param) < 0)
c->param,
get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)
goto fail;
#if HAVE_ALTIVEC

2
libswscale/version.h
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@ -27,7 +27,7 @@
#include "libavutil/avutil.h"
#define LIBSWSCALE_VERSION_MAJOR 2
#define LIBSWSCALE_VERSION_MINOR 3
#define LIBSWSCALE_VERSION_MINOR 4
#define LIBSWSCALE_VERSION_MICRO 100
#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \