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avcodec/vc1: fix calculation of the last line of a slice 

Only for the last slice of the first field is the last line of the slice
equal to the height of the field.

Signed-off-by: Jerome Borsboom <jerome.borsboom@carpalis.nl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Jerome Borsboom 2018-05-18 17:06:32 +02:00 committed by Michael Niedermayer
parent ca878845ae
commit 2b86472a65
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vc1dec.c
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@ -1029,7 +1029,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
av_log(v->s.avctx, AV_LOG_ERROR, "first field slice count too large\n");
continue;
}
s->end_mb_y = (i <= n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
s->end_mb_y = (i == n_slices1 + 1) ? mb_height : FFMIN(mb_height, slices[i].mby_start % mb_height);
}
if (s->end_mb_y <= s->start_mb_y) {
av_log(v->s.avctx, AV_LOG_ERROR, "end mb y %d %d invalid\n", s->end_mb_y, s->start_mb_y);