--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/layer1/gtt_include/ctm/diag_interleaver.h	Fri Oct 16 06:23:26 2020 +0000
@@ -0,0 +1,67 @@
+/*
+*******************************************************************************
+*
+*      COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
+*      90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100
+*
+*      The program(s) may be used and/or copied only with the
+*      written permission from Ericsson or in accordance
+*      with the terms and conditions stipulated in the agreement or
+*      contract under which the program(s) have been supplied.
+*
+*******************************************************************************
+*
+*      File             : diag_interleaver.h
+*      Purpose          : diagonal (chain) interleaver routine
+*
+*******************************************************************************
+*/
+#ifndef diag_interleaver_h
+#define diag_interleaver_h "$Id: $"
+
+/*
+*******************************************************************************
+*                         INCLUDE FILES
+*******************************************************************************
+*/
+
+#include "init_interleaver.h"
+
+
+/*
+*******************************************************************************
+*                         DECLARATION OF PROTOTYPES
+*******************************************************************************
+*/
+
+/* ---------------------------------------------------------------------- */
+/* diag_interleaver:                                                      */
+/* Diagonal (chain) interleaver, based on block-by-block processing.      */
+/* An arbitrary number of bits can be interleaved, depending of the       */
+/* value num_bits. The vector "out", which must have the same             */
+/* length than "in", contains the interleaved samples.                    */
+/* All states (memory etc.) of the interleaver are stored in the variable */
+/* *intl_state. Therefore, a pointer to this variable must be handled to  */
+/* this function. This variable initially has to be initialized by the    */
+/* function init_interleaver, which offers also the possibility to        */
+/* specify the dimensions of the interleaver matrix.                      */
+/* ---------------------------------------------------------------------- */
+
+void diag_interleaver(WORD16 *out,
+                      WORD16 *in,
+                      WORD16  num_bits,
+                      interleaver_state_t *intl_state);
+
+/* ---------------------------------------------------------------------- */
+/* diag_interleaver_flush:                                                */
+/* Execution of the diagonal (chain) interleaver without writing in new   */
+/* samples. The number of calculated output samples is returned via the   */
+/* value *num_bits.                                                       */
+/* ---------------------------------------------------------------------- */
+
+void diag_interleaver_flush(WORD16 *out,
+                            WORD16 *num_bits,
+                            interleaver_state_t *intl_state);
+
+#endif
+