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Rounding control for motion compensation. 

Originally committed as revision 5759 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-07-16 03:45:04 +00:00
parent 408ec4e2a6
commit c5b32ec1cb
1 changed files with 41 additions and 16 deletions
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49
libavcodec/vc1.c
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@ -320,6 +320,7 @@ typedef struct VC1Context{
int mv_type_is_raw; ///< mv type mb plane is not coded
int skip_is_raw; ///< skip mb plane is not coded
uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
int rnd; ///< rounding control
/** Frame decoding info for S/M profiles only */
//@{
@ -978,19 +979,27 @@ static void vc1_mc_1mv(VC1Context *v)
my >>= 1;
dxy = ((my & 1) << 1) | (mx & 1);
if(!v->rnd)
dsp->put_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);
else
dsp->put_no_rnd_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);
} else {
dxy = ((my & 3) << 2) | (mx & 3);
if(!v->rnd)
dsp->put_qpel_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize);
else
dsp->put_no_rnd_qpel_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize);
}
uvmx >>= 1;
uvmy >>= 1;
uvdxy = ((uvmy & 1) << 1) | (uvmx & 1);
dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize, 8);
dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize, 8);
// dsp->put_mspel_pixels_tab[uvdxy](s->dest[1], srcU, s->uvlinesize);
// dsp->put_mspel_pixels_tab[uvdxy](s->dest[2], srcV, s->uvlinesize);
/* Chroma MC always uses qpel blilinear */
uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);
if(!v->rnd){
dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);
dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);
}else{
dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);
dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);
}
}
/** Do motion compensation for 4-MV macroblock - luminance block
@ -1030,10 +1039,16 @@ static void vc1_mc_4mv_luma(VC1Context *v, int n)
my >>= 1;
dxy = ((my & 1) << 1) | (mx & 1);
if(!v->rnd)
dsp->put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);
else
dsp->put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);
} else {
dxy = ((my & 3) << 2) | (mx & 3);
if(!v->rnd)
dsp->put_qpel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize);
else
dsp->put_no_rnd_qpel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize);
}
}
@ -1128,11 +1143,15 @@ static void vc1_mc_4mv_chroma(VC1Context *v)
uvmy = uvmy + ((uvmy<0)?(uvmy&1):-(uvmy&1));
}
uvmx >>= 1;
uvmy >>= 1;
uvdxy = ((uvmy & 1) << 1) | (uvmx & 1);
dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize, 8);
dsp->put_no_rnd_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize, 8);
/* Chroma MC always uses qpel blilinear */
uvdxy = ((uvmy & 3) << 2) | (uvmx & 3);
if(!v->rnd){
dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);
dsp->put_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);
}else{
dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[1], srcU, s->uvlinesize);
dsp->put_no_rnd_qpel_pixels_tab[1][uvdxy](s->dest[2], srcV, s->uvlinesize);
}
}
/**
@ -1299,6 +1318,12 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
if(v->s.pict_type == I_TYPE)
get_bits(gb, 7); // skip buffer fullness
/* calculate RND */
if(v->s.pict_type == I_TYPE)
v->rnd = 1;
if(v->s.pict_type == P_TYPE)
v->rnd ^= 1;
/* Quantizer stuff */
pqindex = get_bits(gb, 5);
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)