Initial check in of AMR (NB and WB) decoders based on PV source code.

1 files changed, 258 insertions, 0 deletions

diff --git a/media/libstagefright/codecs/amrnb/common/src/shr.cpp b/media/libstagefright/codecs/amrnb/common/src/shr.cpp
new file mode 100644
index 0000000..775dc69
--- /dev/null
+++ b/media/libstagefright/codecs/amrnb/common/src/shr.cpp
@@ -0,0 +1,258 @@
+/* ------------------------------------------------------------------
+ * 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: /audio/gsm_amr/c/src/shr.c
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+ Description: Created separate file for the shr function. Sync'ed up with
+          the current template and fixed tabs.
+
+ Description: 1. Modified code by seperating var2=0 condition.
+              2. Changed Input range definitions.
+
+ Description: Made changes based on review meeting.
+              1. Changed Overflow definition.
+              2. Removed pseudo-code.
+              3. Deleted (var2>15&&var1!=0) condition.
+              4. Moved var2>0 condition in front of var2<0 condition.
+
+ Description: Changed the function prototype to pass in a pointer to the
+              overflow flag instead of using global data.
+
+ Description: Made changes per formal review. Updated template.
+              Removed code that updates MOPS counter.
+              Changed parameter name from "overflow" and "pOverflow".
+              Optimized code by eliminating unnecessary typecasting.
+              Filled in the PSEUDO CODE section
+
+ Description: Further optimized typecasting for overflow case
+
+ Who:                       Date:
+ Description:
+------------------------------------------------------------------------------
+------------------------------------------------------------------------------
+ MODULE DESCRIPTION
+ Shift right function with overflow control
+------------------------------------------------------------------------------
+*/
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#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
+; [List function prototypes here]
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL VARIABLE DEFINITIONS
+; [Variable declaration - defined here and used outside this module]
+----------------------------------------------------------------------------*/
+
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: shr
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+    var1 = 16 bit short signed integer (Word16) whose value falls in
+           the range : 0xffff 8000 <= var1 <= 0x0000 7fff.
+
+    var2 = 16 bit short signed integer (Word16) whose value falls in
+           the range : 0xffff 8000 <= var2 <= 0x0000 7fff.
+
+    pOverflow = pointer to overflow (Flag)
+
+ Outputs:
+    pOverflow -> 1 if the shift operation resulted in overflow
+
+ Returns:
+    product = Shifted result limited to 16 bits (Word16)
+
+ Global Variables Used:
+    None
+
+ Local Variables Needed:
+    None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ This function arithmetically shifts the 16 bit input var1 right var2 positions
+ with sign extension. If var2 is negative, arithmetically shift var1 left by
+ -var2 with sign extension. Saturate the result in case of underflows or
+ overflows.
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+ None
+------------------------------------------------------------------------------
+ REFERENCES
+
+ [1] shr() function in basic_op2.c,  UMTS GSM AMR speech codec, R99 -
+ Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+Word16 shr_std (Word16 var1, Word16 var2)
+{
+    Word16 var_out;
+
+    if (var2 < 0)
+    {
+        if (var2 < -16)
+            var2 = -16;
+        var_out = shl_std (var1, -var2);
+#if (WMOPS)
+        mult_stdiCounter[currCounter].shl_std--;
+#endif
+    }
+    else
+    {
+        if (var2 >= 15)
+        {
+            var_out = (var1 < 0) ? -1 : 0;
+        }
+        else
+        {
+            if (var1 < 0)
+            {
+                var_out = ~((~var1) >> var2);
+            }
+            else
+            {
+                var_out = var1 >> var2;
+            }
+        }
+    }
+
+#if (WMOPS)
+    mult_stdiCounter[currCounter].shr_std++;
+#endif
+    return (var_out);
+}
+------------------------------------------------------------------------------
+ RESOURCES USED [optional]
+
+ When the code is written for a specific target processor the
+ the resources used should be documented below.
+
+ HEAP MEMORY USED: x bytes
+
+ STACK MEMORY USED: x bytes
+
+ CLOCK CYCLES: (cycle count equation for this function) + (variable
+                used to represent cycle count for each subroutine
+                called)
+     where: (cycle count variable) = cycle count for [subroutine
+                                     name]
+
+------------------------------------------------------------------------------
+ CAUTION [optional]
+ [State any special notes, constraints or cautions for users of this function]
+
+------------------------------------------------------------------------------
+*/
+
+/*----------------------------------------------------------------------------
+; FUNCTION CODE
+----------------------------------------------------------------------------*/
+Word16 shr(register Word16 var1, register Word16 var2, Flag *pOverflow)
+{
+    register Word16 result;
+    register Word32 temp_res;
+
+    if (var2 != 0)
+    {
+        if (var2 > 0)
+        {
+            if (var2 >= 15)
+            {
+                result = ((var1 < 0) ? -1 : 0);
+            }
+            else
+            {
+                if (var1 < 0)
+                {
+                    result = (~((~var1) >> var2));
+                }
+                else
+                {
+                    result = (var1 >> var2);
+                }
+            }
+        }
+        else
+        {
+            if (var2 < -16)
+            {
+                var2 = -16;
+            }
+
+            var2 = -var2;   /* Shift right negative is equivalent */
+            /*   to shifting left positive.       */
+
+            temp_res = ((Word32) var1) << var2;
+            result = (Word16)(temp_res);
+
+            if (temp_res != (Word32) result)
+            {
+                *pOverflow = 1;
+                result = ((var1 > 0) ? MAX_16 : MIN_16);
+            }
+        }
+
+    }
+    else
+    {
+        result = var1;
+    }
+
+    return (result);
+}
+