1 files changed, 84 insertions, 3 deletions

diff --git a/ext/wavpack/gstwavpackcommon.c b/ext/wavpack/gstwavpackcommon.c
index 61c8add0..0272fdf0 100644
--- a/ext/wavpack/gstwavpackcommon.c
+++ b/ext/wavpack/gstwavpackcommon.c
@@ -1,3 +1,30 @@
+/* GStreamer Wavpack plugin
+ * Copyright (c) 2005 Arwed v. Merkatz <v.merkatz@gmx.net>
+ * Copyright (c) 1998 - 2005 Conifer Software
+ * Copyright (c) 2006 Sebastian Dröge <slomo@circular-chaos.org>
+ *
+ * gstwavpackcommon.c: common helper functions
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "gstwavpackcommon.h"
 #include <string.h>
 
@@ -5,10 +32,64 @@ gboolean
 gst_wavpack_read_header (WavpackHeader * header, guint8 * buf)
 {
   g_memmove (header, buf, sizeof (WavpackHeader));
+
+#ifndef WAVPACK_OLD_API
+  WavpackLittleEndianToNative (header, WavpackHeaderFormat);
+#else
   little_endian_to_native (header, WavpackHeaderFormat);
+#endif
+
+  return (memcmp (header->ckID, "wvpk", 4) == 0);
+}
 
-  if (strncmp (header->ckID, "wvpk", 4))
+/* inspired by the original one in wavpack */
+gboolean
+gst_wavpack_read_metadata (GstWavpackMetadata * wpmd, guint8 * header_data,
+    guint8 ** p_data)
+{
+  WavpackHeader hdr;
+  guint8 *end;
+
+  gst_wavpack_read_header (&hdr, header_data);
+  end = header_data + hdr.ckSize + 8;
+
+  if (end - *p_data < 2)
     return FALSE;
-  else
-    return TRUE;
+
+  wpmd->id = GST_READ_UINT8 (*p_data);
+  wpmd->byte_length = 2 * (guint) GST_READ_UINT8 (*p_data + 1);
+
+  *p_data += 2;
+
+  if ((wpmd->id & ID_LARGE) == ID_LARGE) {
+    guint extra;
+
+    wpmd->id &= ~ID_LARGE;
+
+    if (end - *p_data < 2)
+      return FALSE;
+
+    extra = GST_READ_UINT16_LE (*p_data);
+    wpmd->byte_length += (extra << 9);
+    *p_data += 2;
+  }
+
+  if ((wpmd->id & ID_ODD_SIZE) == ID_ODD_SIZE) {
+    wpmd->id &= ~ID_ODD_SIZE;
+    --wpmd->byte_length;
+  }
+
+  if (wpmd->byte_length > 0) {
+    if (end - *p_data < wpmd->byte_length + (wpmd->byte_length & 1)) {
+      wpmd->data = NULL;
+      return FALSE;
+    }
+
+    wpmd->data = *p_data;
+    *p_data += wpmd->byte_length + (wpmd->byte_length & 1);
+  } else {
+    wpmd->data = NULL;
+  }
+
+  return TRUE;
 }