[libav-stable] wav: Always seek to an even offset

Luca Barbato git at libav.org
Mon May 6 09:42:53 CEST 2013


Module: libav
Branch: master
Commit: ac87eaf856e0fb51917266b899bb15d19b907baf

Author:    Luca Barbato <lu_zero at gentoo.org>
Committer: Luca Barbato <lu_zero at gentoo.org>
Date:      Sat May  4 12:18:57 2013 +0200

wav: Always seek to an even offset

RIFF chunks are aligned to 16bit according to the specification.

Bug-Id:500
CC:libav-stable at libav.org

---

 libavformat/wavdec.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 63f9c38..a3471fd 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -49,6 +49,12 @@ static int64_t next_tag(AVIOContext *pb, uint32_t *tag)
     return avio_rl32(pb);
 }
 
+/* RIFF chunks are always on a even offset. */
+static int64_t wav_seek_tag(AVIOContext *s, int64_t offset, int whence)
+{
+    return avio_seek(s, offset + (offset & 1), whence);
+}
+
 /* return the size of the found tag */
 static int64_t find_tag(AVIOContext *pb, uint32_t tag1)
 {
@@ -61,7 +67,7 @@ static int64_t find_tag(AVIOContext *pb, uint32_t tag1)
         size = next_tag(pb, &tag);
         if (tag == tag1)
             break;
-        avio_skip(pb, size);
+        wav_seek_tag(pb, size, SEEK_CUR);
     }
     return size;
 }
@@ -307,7 +313,7 @@ static int wav_read_header(AVFormatContext *s)
 
         /* seek to next tag unless we know that we'll run into EOF */
         if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
-            avio_seek(pb, next_tag_ofs, SEEK_SET) < 0) {
+            wav_seek_tag(pb, next_tag_ofs, SEEK_SET) < 0) {
             break;
         }
     }



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