mpegaudiodecheader: check the header in avpriv_mpegaudio_decode_header

Almost all the places from which this function is called already check
the header manually and in the two that don't (the mp3 muxer) the check
should not cause any problems.

1 files changed, 7 insertions, 5 deletions

diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c
index a875b82c0a..8904797491 100644
--- a/libavformat/mp3dec.c
+++ b/libavformat/mp3dec.c
@@ -275,14 +275,16 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
     MPADecodeHeader c;
     int vbrtag_size = 0;
     MP3DecContext *mp3 = s->priv_data;
+    int ret;
 
     ffio_init_checksum(s->pb, ff_crcA001_update, 0);
 
     v = avio_rb32(s->pb);
-    if(ff_mpa_check_header(v) < 0)
-      return -1;
 
-    if (avpriv_mpegaudio_decode_header(&c, v) == 0)
+    ret = avpriv_mpegaudio_decode_header(&c, v);
+    if (ret < 0)
+        return ret;
+    else if (ret == 0)
         vbrtag_size = c.frame_size;
     if(c.layer != 3)
         return -1;
@@ -388,8 +390,8 @@ static int check(AVIOContext *pb, int64_t pos, int64_t *out_pos)
 
         header = avio_rb32(pb);
 
-        if (ff_mpa_check_header(header) < 0 ||
-            avpriv_mpegaudio_decode_header(&mh, header))
+
+        if (avpriv_mpegaudio_decode_header(&mh, header))
             break;
         out_pos[i] = off;
     }