On 3/19/2021 2:58 AM, Andreas Rheinhardt wrote:
Always leaving said packet in a blank state after having used it
allows to avoid having to reset it before one uses it; and it also
allows to use it in more places than just in parse_packets() here.

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>
---
  libavformat/utils.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavformat/utils.c b/libavformat/utils.c
index d9a08c9ccd..0c167d0cb9 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -1427,9 +1427,7 @@ static int parse_packet(AVFormatContext *s, AVPacket *pkt,
      int size      = pkt->size;
      int ret = 0, got_output = flush;
- if (size || flush) {
-        av_packet_unref(out_pkt);
-    } else if (st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+    if (!size && !flush && st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
          // preserve 0-size sync packets
          compute_pkt_fields(s, st, st->parser, pkt, AV_NOPTS_VALUE, 
AV_NOPTS_VALUE);
      }
@@ -1525,6 +1523,8 @@ static int parse_packet(AVFormatContext *s, AVPacket *pkt,
      }
fail:
+    out_pkt->data = NULL;
+    out_pkt->size = 0;

Move the av_packet_unref(out_pkt) from the failure path of the avpriv_packet_list_put() call here instead, and put it behind a ret < 0 check. It communicates the intention more clearly than just resetting two fields out of a dozen, which could be wrongly interpreted as "We want the rest intact here". On success avpriv_packet_list_put() will have moved the reference to the list, so the packet will be already clean.

      av_packet_unref(pkt);
      return ret;
  }


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