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Code Issues Releases Activity

experimental half-pel motion compensation for C planes, courtesy of Dr.

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Tim

Originally committed as revision 2331 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2003-10-02 04:19:56 +00:00
parent dda6142361
commit ec59fd536f
1 changed files with 99 additions and 4 deletions
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103
libavcodec/roqvideo.c
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@ -41,6 +41,9 @@ typedef struct {
int idx[4];
} roq_qcell;
static int uiclip[1024], *uiclp; /* clipping table */
#define avg2(a,b) uiclp[(((int)(a)+(int)(b)+1)>>1)]
#define avg4(a,b,c,d) uiclp[(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)]
typedef struct RoqContext {
@ -132,9 +135,9 @@ static void apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
}
static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
char mean_x, char mean_y)
signed char mean_x, signed char mean_y)
{
int i, mx, my;
int i, hw, mx, my;
unsigned char *pa, *pb;
mx = x + 8 - (mv >> 4) - mean_x;
@ -151,6 +154,7 @@ static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
pb += ri->y_stride;
}
#if 0
pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
for(i = 0; i < 2; i++) {
@ -168,12 +172,53 @@ static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
pa += ri->c_stride;
pb += ri->c_stride;
}
#else
hw = ri->y_stride/2;
pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
for(i = 0; i < 2; i++) {
switch(((my & 0x01) << 1) | (mx & 0x01)) {
case 0:
pa[0] = pb[0];
pa[1] = pb[1];
pa[hw] = pb[hw];
pa[hw+1] = pb[hw+1];
break;
case 1:
pa[0] = avg2(pb[0], pb[1]);
pa[1] = avg2(pb[1], pb[2]);
pa[hw] = avg2(pb[hw], pb[hw+1]);
pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
break;
case 2:
pa[0] = avg2(pb[0], pb[hw]);
pa[1] = avg2(pb[1], pb[hw+1]);
pa[hw] = avg2(pb[hw], pb[hw*2]);
pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
break;
case 3:
pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
break;
}
pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
#endif
}
static void apply_motion_8x8(RoqContext *ri, int x, int y,
unsigned char mv, char mean_x, char mean_y)
unsigned char mv, signed char mean_x, signed char mean_y)
{
int mx, my, i;
int mx, my, i, j, hw;
unsigned char *pa, *pb;
mx = x + 8 - (mv >> 4) - mean_x;
@ -194,6 +239,7 @@ static void apply_motion_8x8(RoqContext *ri, int x, int y,
pb += ri->y_stride;
}
#if 0
pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
for(i = 0; i < 4; i++) {
@ -215,6 +261,50 @@ static void apply_motion_8x8(RoqContext *ri, int x, int y,
pa += ri->c_stride;
pb += ri->c_stride;
}
#else
hw = ri->c_stride;
pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
for(j = 0; j < 2; j++) {
for(i = 0; i < 4; i++) {
switch(((my & 0x01) << 1) | (mx & 0x01)) {
case 0:
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
break;
case 1:
pa[0] = avg2(pb[0], pb[1]);
pa[1] = avg2(pb[1], pb[2]);
pa[2] = avg2(pb[2], pb[3]);
pa[3] = avg2(pb[3], pb[4]);
break;
case 2:
pa[0] = avg2(pb[0], pb[hw]);
pa[1] = avg2(pb[1], pb[hw+1]);
pa[2] = avg2(pb[2], pb[hw+2]);
pa[3] = avg2(pb[3], pb[hw+3]);
break;
case 3:
pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
pa[2] = avg4(pb[2], pb[3], pb[hw+2], pb[hw+3]);
pa[3] = avg4(pb[3], pb[4], pb[hw+3], pb[hw+4]);
break;
}
pa += ri->c_stride;
pb += ri->c_stride;
}
pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
#endif
}
static void roqvideo_decode_frame(RoqContext *ri)
@ -339,6 +429,7 @@ static void roqvideo_decode_frame(RoqContext *ri)
static int roq_decode_init(AVCodecContext *avctx)
{
RoqContext *s = avctx->priv_data;
int i;
s->avctx = avctx;
s->first_frame = 1;
@ -346,6 +437,10 @@ static int roq_decode_init(AVCodecContext *avctx)
avctx->has_b_frames = 0;
dsputil_init(&s->dsp, avctx);
uiclp = uiclip+512;
for(i = -512; i < 512; i++)
uiclp[i] = (i < 0 ? 0 : (i > 255 ? 255 : i));
return 0;
}