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

1 files changed, 196 insertions, 0 deletions

diff --git a/media/libstagefright/codecs/amrnb/common/src/weight_a.cpp b/media/libstagefright/codecs/amrnb/common/src/weight_a.cpp
new file mode 100644
index 0000000..2e2efc4
--- /dev/null
+++ b/media/libstagefright/codecs/amrnb/common/src/weight_a.cpp
@@ -0,0 +1,196 @@
+/* ------------------------------------------------------------------
+ * 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.
+****************************************************************************************/
+/*
+
+ Pathname: ./audio/gsm-amr/c/src/weight_a.c
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+ Description: Put file into template and first pass at optimization.
+
+ Description: Made changes based on comments from the review meeting. Used
+    pointers instead of index addressing in the arrays.
+
+ Description: Synchronized file with UMTS version 3.2.0. Updated coding
+              template. Removed unnecessary include files.
+
+ Description: Fixed typecasting issue with TI C compiler.
+
+ Description: Made the following changes per comments from Phase 2/3 review:
+              1. Modified FOR loop to count down.
+              2. Used address pre-increment instead of address offsets.
+
+ Description:  Replaced "int" and/or "char" with OSCL defined types.
+
+ Description: Changed round function name to pv_round to avoid conflict with
+              round function in C standard library.
+
+ Who:                           Date:
+ Description:
+
+------------------------------------------------------------------------------
+*/
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include    "weight_a.h"
+#include    "typedef.h"
+#include    "cnst.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
+----------------------------------------------------------------------------*/
+
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: Weight_Ai
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+    a = LPC coefficients (Word16)
+    fac = Spectral expansion factors (Word16)
+    a_exp = Spectral expanded LPC coefficients (Word16)
+
+ Outputs:
+    a_exp points to the updated spectral expanded LPC coefficients
+
+ Returns:
+    None.
+
+ Global Variables Used:
+    None.
+
+ Local Variables Needed:
+    None.
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ This function calculates the spectral expansion for the LP coefficients of
+ order M.
+    a_exp[i] = a[i] * fac[i-1]    ; i=1..M
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None.
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ weight_a.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+void Weight_Ai (
+    Word16 a[],         // (i)     : a[M+1]  LPC coefficients   (M=10)
+    const Word16 fac[], // (i)     : Spectral expansion factors.
+    Word16 a_exp[]      // (o)     : Spectral expanded LPC coefficients
+)
+{
+    Word16 i;
+    a_exp[0] = a[0];
+
+    for (i = 1; i <= M; i++)
+    {
+        a_exp[i] = pv_round (L_mult (a[i], fac[i - 1]));
+    }
+    return;
+}
+
+------------------------------------------------------------------------------
+ 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]
+
+------------------------------------------------------------------------------
+*/
+
+void Weight_Ai(
+    Word16 a[],         /* (i)   : a[M+1]  LPC coefficients   (M=10)    */
+    const Word16 fac[], /* (i)   : Spectral expansion factors.          */
+    Word16 a_exp[]      /* (o)   : Spectral expanded LPC coefficients   */
+)
+{
+    register Word16 i;
+
+    *(a_exp) = *(a);
+
+    for (i = M; i >= 1; i--)
+    {
+        a_exp += 1;
+        a += 1;
+        fac += 1;
+        *(a_exp) = (Word16)((((Word32) * (a)) * *(fac - 1)
+                             + 0x00004000L) >> 15);
+    }
+
+    return;
+}
+