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[FFmpeg-devel,02/18] avformat/utils: Always leave parse_pkt in blank state, avoid resetting

Message ID 20210319055904.2264501-2-andreas.rheinhardt@gmail.com
State Accepted
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Series [FFmpeg-devel,01/18] libavformat/utils: Fix indentation
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Commit Message

Andreas Rheinhardt March 19, 2021, 5:58 a.m. UTC
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.rheinhardt@gmail.com>
---
 libavformat/utils.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

James Almer March 19, 2021, 2:02 p.m. UTC | #1
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.rheinhardt@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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Patch

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;
     av_packet_unref(pkt);
     return ret;
 }