Factorise id3v2 header parsing from mp3.c to be shared

Patch by Alex Converse ( alex converse gmail com )

Originally committed as revision 16615 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 35 insertions, 0 deletions

diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
new file mode 100644
index 0000000000..c27443b3c2
--- /dev/null
+++ b/libavformat/id3v2.c
@@ -0,0 +1,35 @@
+/*
+ * ID3v2 header parser
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "id3v2.h"
+
+int ff_id3v2_match(const uint8_t *buf)
+{
+    return  buf[0] == 'I' &&
+            buf[1] == 'D' &&
+            buf[2] == '3' &&
+            buf[3] != 0xff &&
+            buf[4] != 0xff &&
+            (buf[6] & 0x80) == 0 &&
+            (buf[7] & 0x80) == 0 &&
+            (buf[8] & 0x80) == 0 &&
+            (buf[9] & 0x80) == 0;
+}