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Code Issues Releases Activity

avcodec/svq1enc: fix undefined pointer operation

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Fixes Ticket3152

This also removes the dependance on ff_init_block_index/ff_update_block_index()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-25 03:34:00 +01:00
parent c25d2cd20b
commit a81ee2651f
1 changed files with 11 additions and 4 deletions
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15
libavcodec/svq1enc.c
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@ -258,6 +258,15 @@ static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref,
return best_score;
}
static void init_block_index(MpegEncContext *s){
s->block_index[0]= s->b8_stride*(s->mb_y*2 ) + s->mb_x*2;
s->block_index[1]= s->b8_stride*(s->mb_y*2 ) + 1 + s->mb_x*2;
s->block_index[2]= s->b8_stride*(s->mb_y*2 + 1) + s->mb_x*2;
s->block_index[3]= s->b8_stride*(s->mb_y*2 + 1) + 1 + s->mb_x*2;
s->block_index[4]= s->mb_stride*(s->mb_y + 1) + s->b8_stride*s->mb_height*2 + s->mb_x;
s->block_index[5]= s->mb_stride*(s->mb_y + s->mb_height + 2) + s->b8_stride*s->mb_height*2 + s->mb_x;
}
static int svq1_encode_plane(SVQ1Context *s, int plane,
unsigned char *src_plane,
unsigned char *ref_plane,
@ -353,8 +362,7 @@ static int svq1_encode_plane(SVQ1Context *s, int plane,
for (x = 0; x < block_width; x++) {
s->m.mb_x = x;
ff_init_block_index(&s->m);
ff_update_block_index(&s->m);
init_block_index(&s->m);
ff_estimate_p_frame_motion(&s->m, x, y);
}
@ -394,8 +402,7 @@ static int svq1_encode_plane(SVQ1Context *s, int plane,
}
s->m.mb_x = x;
ff_init_block_index(&s->m);
ff_update_block_index(&s->m);
init_block_index(&s->m);
if (f->pict_type == AV_PICTURE_TYPE_I ||
(s->m.mb_type[x + y * s->m.mb_stride] &