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zerocodec: check if there is previous frame

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Fixes crash in bug #1219.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-05-04 10:24:39 +00:00
parent b7159877b1
commit 4b70bba57e
1 changed files with 4 additions and 0 deletions
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4
libavcodec/zerocodec.c
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@ -65,6 +65,10 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
pic->key_frame = 1;
pic->pict_type = AV_PICTURE_TYPE_I;
} else {
if (prev == NULL) {
av_log(avctx, AV_LOG_ERROR, "No previous frame!\n");
return AVERROR_INVALIDDATA;
}
pic->key_frame = 0;
pic->pict_type = AV_PICTURE_TYPE_P;
}