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optimize 

Originally committed as revision 1883 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-05-15 00:43:43 +00:00
parent d8085ea727
commit 94d44f455c
1 changed files with 41 additions and 25 deletions
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66
libavcodec/svq3.c
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@ -43,6 +43,10 @@
* svq3 decoder.
*/
#define FULLPEL_MODE 1
#define HALFPEL_MODE 2
#define THIRDPEL_MODE 3
/* dual scan (from some older h264 draft)
o-->o-->o o
| /|
@ -374,17 +378,13 @@ static void sixpel_mc_put (MpegEncContext *s,
}
static inline void svq3_mc_dir_part (MpegEncContext *s, int x, int y,
int width, int height, int mx, int my) {
int width, int height, int mx, int my, int dxy) {
uint8_t *src, *dest;
int i, emu = 0;
const int sx = ((unsigned) (mx + 0x7FFFFFFE)) % 6;
const int sy = ((unsigned) (my + 0x7FFFFFFE)) % 6;
const int dxy= 6*sy + sx;
/* decode and clip motion vector to frame border (+16) */
mx = x + (mx - sx) / 6;
my = y + (my - sy) / 6;
mx += x;
my += y;
if (mx < 0 || mx >= (s->width - width - 1) ||
my < 0 || my >= (s->height - height - 1)) {
@ -441,17 +441,17 @@ static int svq3_decode_mb (H264Context *h, unsigned int mb_type) {
h->topright_samples_available = 0xFFFF;
if (mb_type == 0) { /* SKIP */
svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0);
svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0);
cbp = 0;
mb_type = MB_TYPE_SKIP;
} else if (mb_type < 8) { /* INTER */
if (h->thirdpel_flag && h->halfpel_flag == !get_bits (&s->gb, 1)) {
mode = 3; /* thirdpel */
mode = THIRDPEL_MODE;
} else if (h->halfpel_flag && h->thirdpel_flag == !get_bits (&s->gb, 1)) {
mode = 2; /* halfpel */
mode = HALFPEL_MODE;
} else {
mode = 1; /* fullpel */
mode = FULLPEL_MODE;
}
/* fill caches */
@ -496,6 +496,7 @@ static int svq3_decode_mb (H264Context *h, unsigned int mb_type) {
for (i=0; i < 16; i+=part_height) {
for (j=0; j < 16; j+=part_width) {
int dxy;
x = 16*s->mb_x + j;
y = 16*s->mb_y + i;
k = ((j>>2)&1) + ((i>>1)&2) + ((j>>1)&4) + (i&8);
@ -513,23 +514,38 @@ static int svq3_decode_mb (H264Context *h, unsigned int mb_type) {
if (dx == INVALID_VLC || dy == INVALID_VLC) {
return -1;
}
/* compute motion vector */
if (mode == 3) {
mx = ((mx + 1) & ~0x1) + 2*dx;
my = ((my + 1) & ~0x1) + 2*dy;
} else if (mode == 2) {
mx = (mx + 1) - ((unsigned) (0x7FFFFFFF + mx) % 3) + 3*dx;
my = (my + 1) - ((unsigned) (0x7FFFFFFF + my) % 3) + 3*dy;
} else if (mode == 1) {
mx = (mx + 3) - ((unsigned) (0x7FFFFFFB + mx) % 6) + 6*dx;
my = (my + 3) - ((unsigned) (0x7FFFFFFB + my) % 6) + 6*dy;
if (mode == THIRDPEL_MODE) {
int fx, fy;
mx = ((mx + 1)>>1) + dx;
my = ((my + 1)>>1) + dy;
fx= ((unsigned)(mx + 0x3000))/3 - 0x1000;
fy= ((unsigned)(my + 0x3000))/3 - 0x1000;
dxy= 2*(mx - 3*fx) + 2*6*(my - 3*fy);
svq3_mc_dir_part (s, x, y, part_width, part_height, fx, fy, dxy);
mx += mx;
my += my;
} else if (mode == HALFPEL_MODE) {
mx = ((unsigned)(mx + 1 + 0x3000))/3 + dx - 0x1000;
my = ((unsigned)(my + 1 + 0x3000))/3 + dy - 0x1000;
dxy= 3*(mx&1) + 6*3*(my&1);
svq3_mc_dir_part (s, x, y, part_width, part_height, mx>>1, my>>1, dxy);
mx *= 3;
my *= 3;
} else {
assert(mode == FULLPEL_MODE);
mx = ((unsigned)(mx + 3 + 0x6000))/6 + dx - 0x1000;
my = ((unsigned)(my + 3 + 0x6000))/6 + dy - 0x1000;
svq3_mc_dir_part (s, x, y, part_width, part_height, mx, my, 0);
mx *= 6;
my *= 6;
}
/* update mv_cache */
/* update mv_cache */
fill_rectangle(h->mv_cache[0][scan8[k]], part_width>>2, part_height>>2, 8, (mx&0xFFFF)+(my<<16), 4);
svq3_mc_dir_part (s, x, y, part_width, part_height, mx, my);
}
}