From a9d39d6eb935a9cd96e9cb5fc10e7ba60abdff90 Mon Sep 17 00:00:00 2001
From: Romain Beauxis <romain.beauxis@gmail.com>
Date: Fri, 9 May 2025 18:43:22 -0500
Subject: [PATCH] libavformat/oggdec.{c, h}: Implement packet skip on packet
 return value of 1

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/oggdec.c | 22 ++++++++++++++--------
 libavformat/oggdec.h |  1 +
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 5339fdd32c..9baf8040a9 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -605,20 +605,26 @@ static int ogg_packet(AVFormatContext *s, int *sid, int *dstart, int *dsize,
     } else {
         os->pflags    = 0;
         os->pduration = 0;
+
+        ret = 0;
         if (os->codec && os->codec->packet) {
             if ((ret = os->codec->packet(s, idx)) < 0) {
                 av_log(s, AV_LOG_ERROR, "Packet processing failed: %s\n", av_err2str(ret));
                 return ret;
             }
         }
-        if (sid)
-            *sid = idx;
-        if (dstart)
-            *dstart = os->pstart;
-        if (dsize)
-            *dsize = os->psize;
-        if (fpos)
-            *fpos = os->sync_pos;
+
+        if (!ret) {
+            if (sid)
+                *sid = idx;
+            if (dstart)
+                *dstart = os->pstart;
+            if (dsize)
+                *dsize = os->psize;
+            if (fpos)
+                *fpos = os->sync_pos;
+        }
+
         os->pstart  += os->psize;
         os->psize    = 0;
         if(os->pstart == os->bufpos)
diff --git a/libavformat/oggdec.h b/libavformat/oggdec.h
index 5225b77a07..bc670d0f1e 100644
--- a/libavformat/oggdec.h
+++ b/libavformat/oggdec.h
@@ -43,6 +43,7 @@ struct ogg_codec {
      * @return < 0 (AVERROR) code or -1 on error
      *         == 0 if the packet was a regular data packet.
      *         == 0 or 1 if the packet was a header from a chained bitstream.
+     *           (1 will cause the packet to be skiped in calling code (ogg_packet())
      */
     int (*packet)(AVFormatContext *, int);
     /**