From a62178be80dd6a643973f62002fc0ed42495c358 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 16 Nov 2015 18:34:44 +0100
Subject: [PATCH] avcodec/pngdec: Replace assert by request for sample for
 unsupported TRNS cases

Fixes assertion failure
Fixes: 7f646252a30ee28b583aac1f82e7985e/signal_sigabrt_7ffff6ae7cc9_7353_62fc077bf2f454d39e188c69807193a6.png

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/pngdec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index fe81d02601..305908700b 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -665,7 +665,10 @@ static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
                 break;
 
             default:
-                av_assert0(0);
+                avpriv_request_sample(avctx, "bit depth %d "
+                        "and color type %d with TRNS",
+                        s->bit_depth, s->color_type);
+                return AVERROR_INVALIDDATA;
             }
 
             s->bpp += byte_depth;