1 files changed, 131 insertions, 0 deletions
diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/levinson.h b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/levinson.h
new file mode 100644
index 0000000..dec6718
--- /dev/null
+++ b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/levinson.h
@@ -0,0 +1,131 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 1998-2009 PacketVideo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+/****************************************************************************************
+Portions of this file are derived from the following 3GPP standard:
+
+    3GPP TS 26.073
+    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
+    Available from http://www.3gpp.org
+
+(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
+Permission to distribute, modify and use this file under the standard license
+terms listed above has been obtained from the copyright holder.
+****************************************************************************************/
+/*
+------------------------------------------------------------------------------
+
+
+
+ Filename: levinson.h
+
+------------------------------------------------------------------------------
+ INCLUDE DESCRIPTION
+
+      File             : lag_wind.h
+      Purpose          : Lag windowing of autocorrelations.
+
+------------------------------------------------------------------------------
+*/
+
+#ifndef _LEVINSON_H_
+#define _LEVINSON_H_
+#define levinson_h "$Id $"
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include "typedef.h"
+#include "cnst.h"
+
+/*--------------------------------------------------------------------------*/
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /*----------------------------------------------------------------------------
+    ; MACROS
+    ; [Define module specific macros here]
+    ----------------------------------------------------------------------------*/
+
+    /*----------------------------------------------------------------------------
+    ; DEFINES
+    ; [Include all pre-processor statements here.]
+    ----------------------------------------------------------------------------*/
+
+    /*----------------------------------------------------------------------------
+    ; EXTERNAL VARIABLES REFERENCES
+    ; [Declare variables used in this module but defined elsewhere]
+    ----------------------------------------------------------------------------*/
+
+    /*----------------------------------------------------------------------------
+    ; SIMPLE TYPEDEF'S
+    ----------------------------------------------------------------------------*/
+
+    /*----------------------------------------------------------------------------
+    ; ENUMERATED TYPEDEF'S
+    ----------------------------------------------------------------------------*/
+
+    /*----------------------------------------------------------------------------
+    ; STRUCTURES TYPEDEF'S
+    ----------------------------------------------------------------------------*/
+    typedef struct
+    {
+        Word16 old_A[M + 1];     /* Last A(z) for case of unstable filter */
+    } LevinsonState;
+
+    /*----------------------------------------------------------------------------
+    ; GLOBAL FUNCTION DEFINITIONS
+    ; [List function prototypes here]
+    ----------------------------------------------------------------------------*/
+    Word16 Levinson_init(LevinsonState **st);
+    /* initialize one instance of the pre processing state.
+       Stores pointer to filter status struct in *st. This pointer has to
+       be passed to Levinson in each call.
+       returns 0 on success
+     */
+
+    Word16 Levinson_reset(LevinsonState *st);
+    /* reset of pre processing state (i.e. set state memory to zero)
+       returns 0 on success
+     */
+    void Levinson_exit(LevinsonState **st);
+    /* de-initialize pre processing state (i.e. free status struct)
+       stores NULL in *st
+     */
+
+    Word16 Levinson(
+        LevinsonState *st,
+        Word16 Rh[],       /* i : Rh[m+1] Vector of autocorrelations (msb) */
+        Word16 Rl[],       /* i : Rl[m+1] Vector of autocorrelations (lsb) */
+        Word16 A[],        /* o : A[m]    LPC coefficients  (m = 10)       */
+        Word16 rc[],        /* o : rc[4]   First 4 reflection coefficients  */
+        Flag   *pOverflow
+    );
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* _LEVINSON_H_ */
+
+
+
+