rmdec: Move SIPR code shared with Matroska demuxer to a separate file

libavformat/rmsipr.h

@@ -0,0 +1,35 @@
+/*
+ * tables and functions for demuxing SIPR audio muxed RealMedia style
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_RMSIPR_H
+#define AVFORMAT_RMSIPR_H
+
+#include <stdint.h>
+
+extern const unsigned char ff_sipr_subpk_size[4];
+
+/**
+ * Perform 4-bit block reordering for SIPR data.
+ *
+ * @param buf SIPR data
+ */
+void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize);
+
+#endif /* AVFORMAT_RMSIPR_H */