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cleanup macroblock layer: merged decode of skipped MBs

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with non-skipped

Originally committed as revision 5603 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer 2006-07-03 18:43:45 +00:00
parent f503b19574
commit ad78c0f3f1
1 changed files with 32 additions and 52 deletions
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80
libavcodec/cavs.c
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@ -574,7 +574,8 @@ static inline void mv_pred_median(AVSContext *h, vector_t *mvP, vector_t *mvA, v
}
static inline void mv_pred_direct(AVSContext *h, vector_t *pmv_fw,
vector_t *pmv_bw, vector_t *col_mv) {
vector_t *col_mv) {
vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;
int den = h->direct_den[col_mv->ref];
int m = col_mv->x >> 31;
@ -862,13 +863,15 @@ static inline int next_mb(AVSContext *h) {
return 1;
}
static void decode_mb_i(AVSContext *h, int is_i_pic) {
static void decode_mb_i(AVSContext *h) {
GetBitContext *gb = &h->s.gb;
int block, pred_mode_uv;
uint8_t top[18];
uint8_t left[18];
uint8_t *d;
init_mb(h);
/* get intra prediction modes from stream */
for(block=0;block<4;block++) {
int nA,nB,predpred;
@ -913,7 +916,7 @@ static void decode_mb_i(AVSContext *h, int is_i_pic) {
}
/* get coded block pattern */
if(is_i_pic)
if(h->pic_type == FF_I_TYPE)
h->cbp = cbp_tab[get_ue_golomb(gb)][0];
if(h->cbp && !h->qp_fixed)
h->qp += get_se_golomb(gb); //qp_delta
@ -960,39 +963,15 @@ static void decode_mb_i(AVSContext *h, int is_i_pic) {
*h->col_type = I_8X8;
}
static void mb_skip_p(AVSContext *h) {
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
inter_pred(h);
store_mvs(h);
filter_mb(h,P_SKIP);
*h->col_type = P_SKIP;
}
static void mb_skip_b(AVSContext *h) {
int i;
if(!(*h->col_type)) {
/* intra MB at co-location, do in-plane prediction */
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
} else {
/* direct prediction from co-located P MB, block-wise */
for(i=0;i<4;i++)
mv_pred_direct(h,&h->mv[mv_scan[i]],
&h->mv[mv_scan[i]+MV_BWD_OFFS],
&h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + i]);
}
}
static void decode_mb_p(AVSContext *h, enum mb_t mb_type) {
GetBitContext *gb = &h->s.gb;
int ref[4];
init_mb(h);
switch(mb_type) {
case P_SKIP:
mb_skip_p(h);
return;
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
break;
case P_16X16:
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]);
@ -1021,6 +1000,7 @@ static void decode_mb_p(AVSContext *h, enum mb_t mb_type) {
}
inter_pred(h);
store_mvs(h);
if(mb_type != P_SKIP)
decode_residual_inter(h);
filter_mb(h,mb_type);
*h->col_type = mb_type;
@ -1031,6 +1011,8 @@ static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {
enum sub_mb_t sub_type[4];
int flags;
init_mb(h);
/* reset all MVs */
h->mv[MV_FWD_X0] = dir_mv;
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
@ -1038,12 +1020,16 @@ static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
switch(mb_type) {
case B_SKIP:
mb_skip_b(h);
inter_pred(h);
filter_mb(h,B_SKIP);
return;
case B_DIRECT:
mb_skip_b(h);
if(!(*h->col_type)) {
/* intra MB at co-location, do in-plane prediction */
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
} else
/* direct prediction from co-located P MB, block-wise */
for(block=0;block<4;block++)
mv_pred_direct(h,&h->mv[mv_scan[block]],
&h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);
break;
case B_FWD_16X16:
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
@ -1070,7 +1056,6 @@ static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {
MV_PRED_BSKIP, BLK_8X8, 0);
} else
mv_pred_direct(h,&h->mv[mv_scan[block]],
&h->mv[mv_scan[block]+MV_BWD_OFFS],
&h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);
break;
case B_SUB_FWD:
@ -1131,6 +1116,7 @@ static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {
}
}
inter_pred(h);
if(mb_type != B_SKIP)
decode_residual_inter(h);
filter_mb(h,mb_type);
}
@ -1199,7 +1185,7 @@ static void init_pic(AVSContext *h) {
static int decode_pic(AVSContext *h) {
MpegEncContext *s = &h->s;
int i,skip_count;
int skip_count;
enum mb_t mb_type;
if (!s->context_initialized) {
@ -1273,26 +1259,23 @@ static int decode_pic(AVSContext *h) {
check_for_slice(h);
if(h->pic_type == FF_I_TYPE) {
do {
init_mb(h);
decode_mb_i(h,1);
decode_mb_i(h);
} while(next_mb(h));
} else if(h->pic_type == FF_P_TYPE) {
do {
if(h->skip_mode_flag) {
skip_count = get_ue_golomb(&s->gb);
for(i=0;i<skip_count;i++) {
init_mb(h);
mb_skip_p(h);
while(skip_count--) {
decode_mb_p(h,P_SKIP);
if(!next_mb(h))
goto done;
}
mb_type = get_ue_golomb(&s->gb) + P_16X16;
} else
mb_type = get_ue_golomb(&s->gb) + P_SKIP;
init_mb(h);
if(mb_type > P_8X8) {
h->cbp = cbp_tab[mb_type - P_8X8 - 1][0];
decode_mb_i(h,0);
decode_mb_i(h);
} else
decode_mb_p(h,mb_type);
} while(next_mb(h));
@ -1300,11 +1283,8 @@ static int decode_pic(AVSContext *h) {
do {
if(h->skip_mode_flag) {
skip_count = get_ue_golomb(&s->gb);
for(i=0;i<skip_count;i++) {
init_mb(h);
mb_skip_b(h);
inter_pred(h);
filter_mb(h,B_SKIP);
while(skip_count--) {
decode_mb_b(h,B_SKIP);
if(!next_mb(h))
goto done;
}
@ -1314,7 +1294,7 @@ static int decode_pic(AVSContext *h) {
init_mb(h);
if(mb_type > B_8X8) {
h->cbp = cbp_tab[mb_type - B_8X8 - 1][0];
decode_mb_i(h,0);
decode_mb_i(h);
} else
decode_mb_b(h,mb_type);
} while(next_mb(h));