From a92dbeb9ae520d39069381be528c5e8d4756da5f Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Mon, 10 Jul 2023 01:26:31 +0200
Subject: [PATCH] avcodec/decode: Return EAGAIN instead of discarding unused
 packet

Should fix #10457, a regression caused by
69516ab3e917a6e91d26e38d04183c60fd71cbab.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/decode.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index 269633ce10..a47abeca06 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -666,7 +666,9 @@ int attribute_align_arg avcodec_send_packet(AVCodecContext *avctx, const AVPacke
     if (avpkt && !avpkt->size && avpkt->data)
         return AVERROR(EINVAL);
 
-    av_packet_unref(avci->buffer_pkt);
+    if (!AVPACKET_IS_EMPTY(avci->buffer_pkt))
+        return AVERROR(EAGAIN);
+
     if (avpkt && (avpkt->data || avpkt->side_data_elems)) {
         ret = av_packet_ref(avci->buffer_pkt, avpkt);
         if (ret < 0)