avcodec/zerocodec: Avoid undefined NULL - 0

Fixes the zerocodec FATE-test. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2 years ago · 1e1ddbb70d
parent bf8e40ae0d
commit 1e1ddbb70d
1 changed files with 3 additions and 2 deletions
--- a/libavcodec/zerocodec.c
+++ b/libavcodec/zerocodec.c
@ -84,11 +84,12 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, AVFrame *pic,
            return AVERROR_INVALIDDATA;
        }

-        if (!(avpkt->flags & AV_PKT_FLAG_KEY))
+        if (!(avpkt->flags & AV_PKT_FLAG_KEY)) {
            for (j = 0; j < avctx->width << 1; j++)
                dst[j] += prev[j] & -!dst[j];
+            prev -= prev_pic->linesize[0];
+        }

-        prev -= prev_pic->linesize[0];
        dst  -= pic->linesize[0];
    }