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avcodec/vp3: Fix offset handling 

Fixes use of uninitialized memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-19 20:53:53 +01:00
parent 2df5b506ca
commit c3e6a55956
1 changed files with 8 additions and 5 deletions
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13
libavcodec/vp3.c
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@ -177,6 +177,7 @@ typedef struct Vp3DecodeContext {
int data_offset[3];
uint8_t offset_x;
uint8_t offset_y;
int offset_x_warned;
int8_t (*motion_val[2])[2];
@ -2322,8 +2323,7 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
ret = ff_set_dimensions(avctx, s->width, s->height);
if (ret < 0)
return ret;
if (!(avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) &&
(visible_width != s->width || visible_height != s->height)) {
if (!(avctx->flags2 & CODEC_FLAG2_IGNORE_CROP)) {
avctx->width = visible_width;
avctx->height = visible_height;
// translate offsets from theora axis ([0,0] lower left)
@ -2333,9 +2333,12 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
if ((s->offset_x & 0x1F) && !(avctx->flags & CODEC_FLAG_UNALIGNED)) {
s->offset_x &= ~0x1F;
av_log(avctx, AV_LOG_WARNING, "Reducing offset_x from %d to %d"
"chroma samples to preserve alignment.\n",
offset_x, s->offset_x);
if (!s->offset_x_warned) {
s->offset_x_warned = 1;
av_log(avctx, AV_LOG_WARNING, "Reducing offset_x from %d to %d"
"chroma samples to preserve alignment.\n",
offset_x, s->offset_x);
}
}
}