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avcodec/ituh263dec: Implement B frame support with UMV 

Fixes: u263_b-frames_1.avi
Fixes part of Ticket1536

return -1 is used here as it is used in similar code in this function, I intend
to replace it by proper error codes in the whole function.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-01 17:04:52 +01:00
parent e26e6240b6
commit b28ae1e09b
1 changed files with 43 additions and 6 deletions
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49
libavcodec/ituh263dec.c
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@ -771,11 +771,25 @@ int ff_h263_decode_mb(MpegEncContext *s,
//FIXME UMV
if(USES_LIST(mb_type, 0)){
int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
s->mv_dir = MV_DIR_FORWARD;
mx = ff_h263_decode_motion(s, mx, 1);
my = ff_h263_decode_motion(s, my, 1);
if (s->umvplus)
mx = h263p_decode_umotion(s, pred_x);
else
mx = ff_h263_decode_motion(s, pred_x, 1);
if (mx >= 0xffff)
return -1;
if (s->umvplus)
my = h263p_decode_umotion(s, pred_y);
else
my = ff_h263_decode_motion(s, pred_y, 1);
if (my >= 0xffff)
return -1;
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
s->mv[0][0][0] = mx;
s->mv[0][0][1] = my;
@ -784,11 +798,25 @@ int ff_h263_decode_mb(MpegEncContext *s,
}
if(USES_LIST(mb_type, 1)){
int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
s->mv_dir |= MV_DIR_BACKWARD;
mx = ff_h263_decode_motion(s, mx, 1);
my = ff_h263_decode_motion(s, my, 1);
if (s->umvplus)
mx = h263p_decode_umotion(s, pred_x);
else
mx = ff_h263_decode_motion(s, pred_x, 1);
if (mx >= 0xffff)
return -1;
if (s->umvplus)
my = h263p_decode_umotion(s, pred_y);
else
my = ff_h263_decode_motion(s, pred_y, 1);
if (my >= 0xffff)
return -1;
if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
s->mv[1][0][0] = mx;
s->mv[1][0][1] = my;
@ -1081,6 +1109,12 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
}
}
if (s->pict_type == AV_PICTURE_TYPE_B) {
skip_bits(&s->gb, 4); //ELNUM
if (ufep == 1) {
skip_bits(&s->gb, 4); // RLNUM
}
}
}
s->qscale = get_bits(&s->gb, 5);
@ -1133,6 +1167,9 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
}
s->f_code = 1;
if (s->pict_type == AV_PICTURE_TYPE_B)
s->low_delay = 0;
if(s->h263_aic){
s->y_dc_scale_table=
s->c_dc_scale_table= ff_aic_dc_scale_table;