Tizen 2.0 Release2.0_release

1 files changed, 284 insertions, 0 deletions

diff --git a/opencore/codecs_v2/audio/gsm_amr/amr_nb/dec/src/dec_lag3.cpp b/opencore/codecs_v2/audio/gsm_amr/amr_nb/dec/src/dec_lag3.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: dec_lag3.cpp
+ Functions: Dec_lag3
+
+ ------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+    index   -- Word16 -- received pitch index
+    t0_min  -- Word16 -- minimum of search range
+    t0_max  -- Word16 -- maximum of search range
+    i_subfr -- Word16 -- subframe flag
+    T0_prev -- Word16 -- integer pitch delay of last subframe
+                         used in 2nd and 4th subframes
+    flag4   -- Word16 -- flag for encoding with 4 bits
+
+ Outputs:
+
+    T0 -- Pointer to type Word16 -- integer part of pitch lag
+    T0_frac -- Pointer to type Word16 -- fractional part of pitch lag
+    pOverflow -- Pointer to type Flag -- Flag set when overflow occurs
+
+ Returns:
+    None.
+
+ Global Variables Used:
+    None
+
+ Local Variables Needed:
+    None
+
+
+              )
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ PURPOSE:  Decoding of fractional pitch lag with 1/3 resolution.
+           Extract the integer and fraction parts of the pitch lag from
+           the received adaptive codebook index.
+
+  See "Enc_lag3.c" for more details about the encoding procedure.
+
+  The fractional lag in 1st and 3rd subframes is encoded with 8 bits
+  while that in 2nd and 4th subframes is relatively encoded with 4, 5
+  and 6 bits depending on the mode.
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ dec_lag3.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+
+
+------------------------------------------------------------------------------
+*/
+
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include "dec_lag3.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 STORE/BUFFER/POINTER DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL FUNCTION REFERENCES
+; Declare functions defined elsewhere and referenced in this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
+; Declare variables used in this module but defined elsewhere
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; FUNCTION CODE
+----------------------------------------------------------------------------*/
+
+void Dec_lag3(Word16 index,     /* i : received pitch index                 */
+              Word16 t0_min,    /* i : minimum of search range              */
+              Word16 t0_max,    /* i : maximum of search range              */
+              Word16 i_subfr,   /* i : subframe flag                        */
+              Word16 T0_prev,   /* i : integer pitch delay of last subframe
+                                       used in 2nd and 4th subframes        */
+              Word16 * T0,      /* o : integer part of pitch lag            */
+              Word16 * T0_frac, /* o : fractional part of pitch lag         */
+              Word16 flag4,     /* i : flag for encoding with 4 bits        */
+              Flag  *pOverflow  /* o : Flag set when overflow occurs        */
+             )
+{
+    Word16 i;
+    Word16 tmp_lag;
+
+    if (i_subfr == 0)    /* if 1st or 3rd subframe */
+    {
+
+        if (index < 197)
+        {
+
+            tmp_lag = index + 2;
+
+            tmp_lag =
+                mult(
+                    tmp_lag,
+                    10923,
+                    pOverflow);
+
+            i = tmp_lag + 19;
+
+            *T0 = i;
+
+            /* i = 3 * (*T0) */
+
+            i <<=  1;
+            i += *T0;
+
+            tmp_lag = index - i;
+
+            *T0_frac = tmp_lag + 58;
+        }
+        else
+        {
+            *T0 = index - 112;
+
+            *T0_frac = 0;
+        }
+
+    }
+    else
+    {  /* 2nd or 4th subframe */
+
+        if (flag4 == 0)
+        {
+
+            /* 'normal' decoding: either with 5 or 6 bit resolution */
+
+            i = index + 2;
+
+            i = ((Word32) i * 10923) >> 15;
+
+
+            i -= 1;
+
+            *T0 = i + t0_min;
+
+            /* i = 3* (*T0) */
+            i = i + (i << 1);
+
+            tmp_lag = index - 2;
+
+            *T0_frac = tmp_lag - i;
+        }
+        else
+        {
+
+            /* decoding with 4 bit resolution */
+
+            tmp_lag = T0_prev;
+
+            i =
+                sub(
+                    tmp_lag,
+                    t0_min,
+                    pOverflow);
+
+            if (i > 5)
+            {
+                tmp_lag = t0_min + 5;
+            }
+
+            i = t0_max - tmp_lag;
+
+            if (i > 4)
+            {
+                tmp_lag = t0_max - 4;
+            }
+
+            if (index < 4)
+            {
+                i = tmp_lag - 5;
+
+                *T0 = i + index;
+
+                *T0_frac = 0;
+            }
+            else
+            {
+                /* 4 >= index < 12 */
+                if (index < 12)
+                {
+                    i = index - 5;
+                    i = ((Word32) i * 10923) >> 15;
+
+
+                    i--;
+
+                    *T0 =  i + tmp_lag;
+
+                    i = i + (i << 1);
+
+                    tmp_lag = index - 9;
+
+                    *T0_frac = tmp_lag - i;
+                }
+                else
+                {
+                    i = index - 12;
+
+                    i = i + tmp_lag;
+
+                    *T0 = i + 1;
+
+                    *T0_frac = 0;
+                }
+            }
+
+        } /* end if (decoding with 4 bit resolution) */
+    }
+
+    return;
+}