Tizen 2.0 Release2.0_release

1 files changed, 193 insertions, 0 deletions

diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/enc_lag6.cpp b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/enc_lag6.cpp
new file mode 100644
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+++ b/opencore/codecs_v2/audio/gsm_amr/amr_nb/enc/src/enc_lag6.cpp
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+/* ------------------------------------------------------------------
+ * 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: enc_lag6.cpp
+
+------------------------------------------------------------------------------
+ MODULE DESCRIPTION
+
+
+------------------------------------------------------------------------------
+*/
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include "enc_lag6.h"
+#include "typedef.h"
+#include "basic_op.h"
+
+/*----------------------------------------------------------------------------
+; MACROS
+; Define module specific macros here
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; DEFINES
+; Include all pre-processor statements here. Include conditional
+; compile variables also.
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL FUNCTION DEFINITIONS
+; Function Prototype declaration
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL VARIABLE DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: Enc_lag6
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+    T0 -- Word16 -- Pitch delay
+    T0_frac -- Word16 -- Fractional pitch delay
+    T0_min -- Word16 -- minimum of search range
+    delta_flag -- Word16 -- Flag for 1st (or 3rd) subframe
+
+ Outputs:
+    pOverflow -- Pointer to Flag -- overflow indicator
+
+ Returns:
+    Word16 -- Return index of encoding
+
+ Global Variables Used:
+    None
+
+ Local Variables Needed:
+    None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ PURPOSE:  Encoding of fractional pitch lag with 1/6 resolution.
+
+ DESCRIPTION:
+                  First and third subframes:
+                  --------------------------
+ The pitch range is divided as follows:
+         17 3/6  to   94 3/6   resolution 1/6
+         95      to   143      resolution 1
+
+ The period is encoded with 9 bits.
+ For the range with fractions:
+   index = (T-17)*6 + frac - 3;
+                       where T=[17..94] and frac=[-2,-1,0,1,2,3]
+ and for the integer only range
+   index = (T - 95) + 463;        where T=[95..143]
+
+                  Second and fourth subframes:
+                  ----------------------------
+ For the 2nd and 4th subframes a resolution of 1/6 is always used,
+ and the search range is relative to the lag in previous subframe.
+ If t0 is the lag in the previous subframe then
+ t_min=t0-5   and  t_max=t0+4   and  the range is given by
+     (t_min-1) 3/6   to  (t_max) 3/6
+
+ The period in the 2nd (and 4th) subframe is encoded with 6 bits:
+   index = (T-(t_min-1))*6 + frac - 3;
+               where T=[t_min-1..t_max] and frac=[-2,-1,0,1,2,3]
+
+ Note that only 61 values are used. If the decoder receives 61, 62,
+ or 63 as the relative pitch index, it means that a transmission
+ error occurred and the pitch from previous subframe should be used.
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ enc_lag6.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+
+------------------------------------------------------------------------------
+ CAUTION [optional]
+ [State any special notes, constraints or cautions for users of this function]
+
+------------------------------------------------------------------------------
+*/
+
+Word16 Enc_lag6(         /* o : Return index of encoding             */
+    Word16 T0,           /* i : Pitch delay                          */
+    Word16 T0_frac,      /* i : Fractional pitch delay               */
+    Word16 T0_min,       /* i : minimum of search range              */
+    Word16 delta_flag,   /* i : Flag for 1st (or 3rd) subframe       */
+    Flag   *pOverflow    /* o : overflow indicator                   */
+)
+{
+    Word16 index;
+    Word16 i;
+    Word16 temp;
+
+    if (delta_flag == 0)          /* if 1st or 3rd subframe */
+    {
+        /* encode pitch delay (with fraction) */
+        if (T0 <= 94)
+        {
+            /* index = T0*6 - 105 + T0_frac */
+            i = (T0 << 3) - (T0 << 1) - 105;
+
+            index = i + T0_frac;
+        }
+        else
+        {
+            index = T0 + 368;
+        }
+
+    }
+    else
+        /* if second or fourth subframe */
+    {
+        /* index = 6*(T0-T0_min) + 3 + T0_frac  */
+        temp = (T0 - T0_min);
+
+        i = (temp << 3) - (temp << 1);
+        i += 3;
+
+        index = i + T0_frac;
+    }
+
+    return index;
+}