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ffmpeg.wasm-core
Commit c59f9a68 authored by Ronald S. Bultje's avatar Ronald S. Bultje Committed by Michael Niedermayer
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swscale: error dithering for 16/9/10-bit to 8-bit. 

Based on a somewhat similar idea in FFmpeg's swscale copy.
parent 93a10dd5
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Showing with 160 additions and 49 deletions
libswscale/swscale.c
View file @ c59f9a68
......@@ -193,6 +193,18 @@ DECLARE_ALIGNED(8, const uint8_t, dither_8x8_220)[8][8]={
{ 77, 23, 60, 15, 72, 21, 56, 14, },
};
#endif
DECLARE_ALIGNED(8, const uint8_t, dither_8x8_128)[8][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,},
};
DECLARE_ALIGNED(8, const uint8_t, ff_sws_pb_64)[8] =
{ 64, 64, 64, 64, 64, 64, 64, 64 };
DECLARE_ALIGNED(8, const uint8_t, dithers)[8][8][8]={
{
......@@ -387,16 +399,16 @@ static void yuv2yuvX_c(SwsContext *c, const int16_t *lumFilter,
const int16_t *chrFilter, const int16_t **chrUSrc,
const int16_t **chrVSrc,
int chrFilterSize, const int16_t **alpSrc,
uint8_t *dest[4], int dstW, int chrDstW,
const uint8_t *lumDither, const uint8_t *chrDither)
uint8_t *dest[4], int dstW, int chrDstW)
{
uint8_t *yDest = dest[0], *uDest = dest[1], *vDest = dest[2],
*aDest = CONFIG_SWSCALE_ALPHA ? dest[3] : NULL;
int i;
const uint8_t *lumDither = c->lumDither8, *chrDither = c->chrDither8;
//FIXME Optimize (just quickly written not optimized..)
for (i=0; i<dstW; i++) {
int val = lumDither[i&7] << 12;
int val = lumDither[i & 7] << 12;
int j;
for (j=0; j<lumFilterSize; j++)
val += lumSrc[j][i] * lumFilter[j];
......@@ -406,8 +418,8 @@ static void yuv2yuvX_c(SwsContext *c, const int16_t *lumFilter,
if (uDest)
for (i=0; i<chrDstW; i++) {
int u = chrDither[i&7] << 12;
int v = chrDither[(i+3)&7] << 12;
int u = chrDither[i & 7] << 12;
int v = chrDither[(i + 3) & 7] << 12;
int j;
for (j=0; j<chrFilterSize; j++) {
u += chrUSrc[j][i] * chrFilter[j];
......@@ -420,7 +432,7 @@ static void yuv2yuvX_c(SwsContext *c, const int16_t *lumFilter,
if (CONFIG_SWSCALE_ALPHA && aDest)
for (i=0; i<dstW; i++) {
int val = lumDither[i&7] << 12;
int val = lumDither[i & 7] << 12;
int j;
for (j=0; j<lumFilterSize; j++)
val += alpSrc[j][i] * lumFilter[j];
......@@ -432,29 +444,29 @@ static void yuv2yuvX_c(SwsContext *c, const int16_t *lumFilter,
static void yuv2yuv1_c(SwsContext *c, const int16_t *lumSrc,
const int16_t *chrUSrc, const int16_t *chrVSrc,
const int16_t *alpSrc,
uint8_t *dest[4], int dstW, int chrDstW,
const uint8_t *lumDither, const uint8_t *chrDither)
uint8_t *dest[4], int dstW, int chrDstW)
{
uint8_t *yDest = dest[0], *uDest = dest[1], *vDest = dest[2],
*aDest = CONFIG_SWSCALE_ALPHA ? dest[3] : NULL;
int i;
const uint8_t *lumDither = c->lumDither8, *chrDither = c->chrDither8;
for (i=0; i<dstW; i++) {
int val= (lumSrc[i]+lumDither[i&7])>>7;
int val = (lumSrc[i]+ lumDither[i & 7]) >> 7;
yDest[i]= av_clip_uint8(val);
}
if (uDest)
for (i=0; i<chrDstW; i++) {
int u=(chrUSrc[i]+chrDither[i&7])>>7;
int v=(chrVSrc[i]+chrDither[(i+3)&7])>>7;
int u = (chrUSrc[i] + chrDither[i & 7]) >> 7;
int v = (chrVSrc[i] + chrDither[(i + 3) & 7]) >> 7;
uDest[i]= av_clip_uint8(u);
vDest[i]= av_clip_uint8(v);
}
if (CONFIG_SWSCALE_ALPHA && aDest)
for (i=0; i<dstW; i++) {
int val= (alpSrc[i]+lumDither[i&7])>>7;
int val = (alpSrc[i] + lumDither[i & 7]) >> 7;
aDest[i]= av_clip_uint8(val);
}
}
......@@ -464,16 +476,16 @@ static void yuv2nv12X_c(SwsContext *c, const int16_t *lumFilter,
const int16_t *chrFilter, const int16_t **chrUSrc,
const int16_t **chrVSrc, int chrFilterSize,
const int16_t **alpSrc, uint8_t *dest[4],
int dstW, int chrDstW,
const uint8_t *lumDither, const uint8_t *chrDither)
int dstW, int chrDstW)
{
uint8_t *yDest = dest[0], *uDest = dest[1];
enum PixelFormat dstFormat = c->dstFormat;
const uint8_t *lumDither = c->lumDither8, *chrDither = c->chrDither8;
//FIXME Optimize (just quickly written not optimized..)
int i;
for (i=0; i<dstW; i++) {
int val = lumDither[i&7]<<12;
int val = lumDither[i & 7] << 12;
int j;
for (j=0; j<lumFilterSize; j++)
val += lumSrc[j][i] * lumFilter[j];
......@@ -486,8 +498,8 @@ static void yuv2nv12X_c(SwsContext *c, const int16_t *lumFilter,
if (dstFormat == PIX_FMT_NV12)
for (i=0; i<chrDstW; i++) {
int u = chrDither[i&7]<<12;
int v = chrDither[(i+3)&7]<<12;
int u = chrDither[i & 7] << 12;
int v = chrDither[(i + 3) & 7] << 12;
int j;
for (j=0; j<chrFilterSize; j++) {
u += chrUSrc[j][i] * chrFilter[j];
......@@ -499,8 +511,8 @@ static void yuv2nv12X_c(SwsContext *c, const int16_t *lumFilter,
}
else
for (i=0; i<chrDstW; i++) {
int u = chrDither[i&7]<<12;
int v = chrDither[(i+3)&7]<<12;
int u = chrDither[i & 7] << 12;
int v = chrDither[(i + 3) & 7] << 12;
int j;
for (j=0; j<chrFilterSize; j++) {
u += chrUSrc[j][i] * chrFilter[j];
......@@ -2523,6 +2535,7 @@ static int swScale(SwsContext *c, const uint8_t* src[],
const int chrSrcSliceH= -((-srcSliceH) >> c->chrSrcVSubSample);
int lastDstY;
uint32_t *pal=c->pal_yuv;
int should_dither= isNBPS(c->srcFormat) || is16BPS(c->srcFormat);
yuv2planar1_fn yuv2yuv1 = c->yuv2yuv1;
yuv2planarX_fn yuv2yuvX = c->yuv2yuvX;
......@@ -2578,6 +2591,9 @@ static int swScale(SwsContext *c, const uint8_t* src[],
lastInChrBuf= -1;
}
if (!should_dither) {
c->chrDither8 = c->lumDither8 = ff_sws_pb_64;
}
lastDstY= dstY;
for (;dstY < dstH; dstY++) {
......@@ -2588,8 +2604,6 @@ static int swScale(SwsContext *c, const uint8_t* src[],
dst[2] + dstStride[2] * chrDstY,
(CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3] + dstStride[3] * dstY : NULL,
};
const uint8_t *lumDither= should_dither ? dithers[7][dstY &7] : flat64;
const uint8_t *chrDither= should_dither ? dithers[7][chrDstY&7] : flat64;
const int firstLumSrcY= vLumFilterPos[dstY]; //First line needed as input
const int firstLumSrcY2= vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)];
......@@ -2669,6 +2683,10 @@ static int swScale(SwsContext *c, const uint8_t* src[],
#if HAVE_MMX
updateMMXDitherTables(c, dstY, lumBufIndex, chrBufIndex, lastInLumBuf, lastInChrBuf);
#endif
if (should_dither) {
c->chrDither8 = dither_8x8_128[chrDstY & 7];
c->lumDither8 = dither_8x8_128[dstY & 7];
}
if (dstY >= dstH-2) {
// hmm looks like we can't use MMX here without overwriting this array's tail
find_c_packed_planar_out_funcs(c, &yuv2yuv1, &yuv2yuvX,
......@@ -2689,13 +2707,13 @@ static int swScale(SwsContext *c, const uint8_t* src[],
if (c->yuv2yuv1 && vLumFilterSize == 1 && vChrFilterSize == 1) { // unscaled YV12
const int16_t *alpBuf= (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? alpSrcPtr[0] : NULL;
yuv2yuv1(c, lumSrcPtr[0], chrUSrcPtr[0], chrVSrcPtr[0], alpBuf,
dest, dstW, chrDstW, lumDither, chrDither);
dest, dstW, chrDstW);
} else { //General YV12
yuv2yuvX(c, vLumFilter + dstY * vLumFilterSize,
lumSrcPtr, vLumFilterSize,
vChrFilter + chrDstY * vChrFilterSize,
chrUSrcPtr, chrVSrcPtr, vChrFilterSize,
alpSrcPtr, dest, dstW, chrDstW, lumDither, chrDither);
alpSrcPtr, dest, dstW, chrDstW);
}
} else {
assert(lumSrcPtr + vLumFilterSize - 1 < lumPixBuf + vLumBufSize*2);
......
libswscale/swscale_internal.h
View file @ c59f9a68
......@@ -75,8 +75,7 @@ typedef int (*SwsFunc)(struct SwsContext *context, const uint8_t* src[],
typedef void (*yuv2planar1_fn) (struct SwsContext *c,
const int16_t *lumSrc, const int16_t *chrUSrc,
const int16_t *chrVSrc, const int16_t *alpSrc,
uint8_t *dest[4], int dstW, int chrDstW,
const uint8_t *lumDither, const uint8_t *chrDither);
uint8_t *dest[4], int dstW, int chrDstW);
/**
* Write one line of horizontally scaled Y/U/V/A to planar output
* with multi-point vertical scaling between input pixels.
......@@ -99,7 +98,7 @@ typedef void (*yuv2planarX_fn) (struct SwsContext *c, const int16_t *lumFilter,
const int16_t *chrFilter, const int16_t **chrUSrc,
const int16_t **chrVSrc, int chrFilterSize,
const int16_t **alpSrc, uint8_t *dest[4],
int dstW, int chrDstW, const uint8_t *lumDither, const uint8_t *chrDither);
int dstW, int chrDstW);
/**
* Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
* output without any additional vertical scaling (or point-scaling). Note
......@@ -323,7 +322,7 @@ typedef struct SwsContext {
#define UV_OFF "11*8+4*4*256*3+48"
#define UV_OFFx2 "11*8+4*4*256*3+56"
#define DITHER16 "11*8+4*4*256*3+64"
#define DITHER32 "11*8+4*4*256*3+64+16"
#define DITHER32 "11*8+4*4*256*3+80"
DECLARE_ALIGNED(8, uint64_t, redDither);
DECLARE_ALIGNED(8, uint64_t, greenDither);
......@@ -351,6 +350,8 @@ typedef struct SwsContext {
uint16_t dither16[8];
uint32_t dither32[8];
const uint8_t *chrDither8, *lumDither8;
#if HAVE_ALTIVEC
vector signed short CY;
vector signed short CRV;
......
libswscale/x86/swscale_template.c
View file @ c59f9a68
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