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error_resilience: initialize s->block_index[].

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-06 10:27:05 -08:00
parent 11b940a1a8
commit 6193ff6854
1 changed files with 20 additions and 0 deletions
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20
libavcodec/error_resilience.c
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@ -419,9 +419,14 @@ static void guess_mv(MpegEncContext *s)
if ((!(s->avctx->error_concealment&FF_EC_GUESS_MVS)) ||
num_avail <= mb_width / 2) {
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
s->mb_x = 0;
s->mb_y = mb_y;
ff_init_block_index(s);
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
const int mb_xy = mb_x + mb_y * s->mb_stride;
ff_update_block_index(s);
if (IS_INTRA(s->current_picture.f.mb_type[mb_xy]))
continue;
if (!(s->error_status_table[mb_xy] & ER_MV_ERROR))
@ -456,6 +461,9 @@ static void guess_mv(MpegEncContext *s)
changed = 0;
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
s->mb_x = 0;
s->mb_y = mb_y;
ff_init_block_index(s);
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
const int mb_xy = mb_x + mb_y * s->mb_stride;
int mv_predictor[8][2] = { { 0 } };
@ -467,6 +475,8 @@ static void guess_mv(MpegEncContext *s)
const int mot_index = (mb_x + mb_y * mot_stride) * mot_step;
int prev_x, prev_y, prev_ref;
ff_update_block_index(s);
if ((mb_x ^ mb_y ^ pass) & 1)
continue;
@ -1072,11 +1082,16 @@ void ff_er_frame_end(MpegEncContext *s)
/* handle inter blocks with damaged AC */
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
s->mb_x = 0;
s->mb_y = mb_y;
ff_init_block_index(s);
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
const int mb_xy = mb_x + mb_y * s->mb_stride;
const int mb_type = s->current_picture.f.mb_type[mb_xy];
int dir = !s->last_picture.f.data[0];
ff_update_block_index(s);
error = s->error_status_table[mb_xy];
if (IS_INTRA(mb_type))
@ -1114,11 +1129,16 @@ void ff_er_frame_end(MpegEncContext *s)
/* guess MVs */
if (s->pict_type == AV_PICTURE_TYPE_B) {
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
s->mb_x = 0;
s->mb_y = mb_y;
ff_init_block_index(s);
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
int xy = mb_x * 2 + mb_y * 2 * s->b8_stride;
const int mb_xy = mb_x + mb_y * s->mb_stride;
const int mb_type = s->current_picture.f.mb_type[mb_xy];
ff_update_block_index(s);
error = s->error_status_table[mb_xy];
if (IS_INTRA(mb_type))