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faster 8x8 & 16x16 plane prediction by skal (massimin at planet-d dot net)

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Originally committed as revision 1769 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-04-12 22:49:54 +00:00
parent 487bce53eb
commit 30f73fc72e
1 changed files with 56 additions and 69 deletions
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125
libavcodec/h264.c
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@ -1681,42 +1681,35 @@ static void pred16x16_128_dc_c(uint8_t *src, int stride){
}
static void pred16x16_plane_c(uint8_t *src, int stride){
uint8_t *cm = cropTbl + MAX_NEG_CROP;
int i, dx, dy, dc;
int temp[16];
dc= 16*(src[15-stride] + src[-1+15*stride]);
dx=dy=0;
for(i=1; i<9; i++){
dx += i*(src[7+i-stride] - src[7-i-stride]);
dy += i*(src[-1+(7+i)*stride] - src[-1+(7-i)*stride]);
}
dx= (5*dx+32)>>6;
dy= (5*dy+32)>>6;
dc += 16;
int i, j, k;
int a;
uint8_t *cm = cropTbl + MAX_NEG_CROP;
const uint8_t * const src0 = src+7-stride;
const uint8_t *src1 = src+8*stride-1;
const uint8_t *src2 = src1-2*stride; // == src+6*stride-1;
int H = src0[1] - src0[-1];
int V = src1[0] - src2[ 0];
for(k=2; k<=8; ++k) {
src1 += stride; src2 -= stride;
H += k*(src0[k] - src0[-k]);
V += k*(src1[0] - src2[ 0]);
}
H = ( 5*H+32 ) >> 6;
V = ( 5*V+32 ) >> 6;
//FIXME modifiy dc,dx,dy to avoid -7
for(i=0; i<16; i++)
temp[i]= dx*(i-7) + dc;
if( (dc - ABS(dx)*8 - ABS(dy)*8)>>5 < 0
|| (dc + ABS(dx)*8 + ABS(dy)*8)>>5 > 255){
for(i=0; i<16; i++){
int j;
for(j=0; j<16; j++)
src[j + i*stride]= cm[ (temp[j] + dy*(i-7))>>5 ];
}
}else{
for(i=0; i<16; i++){
int j;
for(j=0; j<16; j++)
src[j + i*stride]= (temp[j] + dy*(i-7))>>5;
}
a = 16*(src1[0] + src2[16] + 1) - 7*(V+H);
for(j=16; j>0; --j) {
int b = a;
a += V;
for(i=-16; i<0; i+=4) {
src[16+i] = cm[ (b ) >> 5 ];
src[17+i] = cm[ (b+ H) >> 5 ];
src[18+i] = cm[ (b+2*H) >> 5 ];
src[19+i] = cm[ (b+3*H) >> 5 ];
b += 4*H;
}
src += stride;
}
}
static void pred8x8_vertical_c(uint8_t *src, int stride){
@ -1823,42 +1816,36 @@ static void pred8x8_dc_c(uint8_t *src, int stride){
}
static void pred8x8_plane_c(uint8_t *src, int stride){
uint8_t *cm = cropTbl + MAX_NEG_CROP;
int i, dx, dy, dc;
int temp[8];
int j, k;
int a;
uint8_t *cm = cropTbl + MAX_NEG_CROP;
const uint8_t * const src0 = src+3-stride;
const uint8_t *src1 = src+4*stride-1;
const uint8_t *src2 = src1-2*stride; // == src+2*stride-1;
int H = src0[1] - src0[-1];
int V = src1[0] - src2[ 0];
for(k=2; k<=4; ++k) {
src1 += stride; src2 -= stride;
H += k*(src0[k] - src0[-k]);
V += k*(src1[0] - src2[ 0]);
}
H = ( 17*H+16 ) >> 5;
V = ( 17*V+16 ) >> 5;
dc= 16*(src[7-stride] + src[-1+7*stride]);
dx=dy=0;
for(i=1; i<5; i++){
dx += i*(src[3+i-stride] - src[3-i-stride]);
dy += i*(src[-1+(3+i)*stride] - src[-1+(3-i)*stride]);
}
dx= (17*dx+16)>>5;
dy= (17*dy+16)>>5;
dc += 16;
//FIXME modifiy dc,dx,dy to avoid -3
for(i=0; i<8; i++)
temp[i]= dx*(i-3) + dc;
if( (dc - ABS(dx)*4 - ABS(dy)*4)>>5 < 0
|| (dc + ABS(dx)*4 + ABS(dy)*4)>>5 > 255){
for(i=0; i<8; i++){
int j;
for(j=0; j<8; j++)
src[j + i*stride]= cm[ (temp[j] + dy*(i-3))>>5 ];
}
}else{
for(i=0; i<8; i++){
int j;
for(j=0; j<8; j++)
src[j + i*stride]= (temp[j] + dy*(i-3))>>5;
}
}
a = 16*(src1[0] + src2[8]+1) - 3*(V+H);
for(j=8; j>0; --j) {
int b = a;
a += V;
src[0] = cm[ (b ) >> 5 ];
src[1] = cm[ (b+ H) >> 5 ];
src[2] = cm[ (b+2*H) >> 5 ];
src[3] = cm[ (b+3*H) >> 5 ];
src[4] = cm[ (b+4*H) >> 5 ];
src[5] = cm[ (b+5*H) >> 5 ];
src[6] = cm[ (b+6*H) >> 5 ];
src[7] = cm[ (b+7*H) >> 5 ];
src += stride;
}
}
static inline void mc_dir_part(H264Context *h, Picture *pic, int n, int square, int chroma_height, int delta, int list,