avformat/id3v2: Use ffio_ensure_seekback() in id3v2_read_internal()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
8 years ago · 0cc6dd1b81
parent 7383a835e4
commit 0cc6dd1b81
1 changed files with 3 additions and 1 deletions
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@ -1072,7 +1072,9 @@ static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata,
            break;
        }

-        ret = avio_read(pb, buf, ID3v2_HEADER_SIZE);
+        ret = ffio_ensure_seekback(pb, ID3v2_HEADER_SIZE);
+        if (ret >= 0)
+            ret = avio_read(pb, buf, ID3v2_HEADER_SIZE);
        if (ret != ID3v2_HEADER_SIZE) {
            avio_seek(pb, off, SEEK_SET);
            break;