ljpeg: Check that lowres is 0 as lowres is not possible with ljpeg.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 5a51201d9d..b3b02daab6 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -233,6 +233,11 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
         return -1;
     }
 
+    if(s->lossless && s->avctx->lowres){
+        av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
+        return -1;
+    }
+
     height = get_bits(&s->gb, 16);
     width = get_bits(&s->gb, 16);