Add openmax dl routines for review. MUST NOT BE LANDED

third_party/openmax_dl/dl/sp/src/omxSP_FFTGetBufSize_R_S32.c

+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ *
+ *  This file was originally licensed as follows. It has been
+ *  relicensed with permission from the copyright holders.
+ */
+
+/**
+ * 
+ * File Name:  omxSP_FFTGetBufSize_R_S32.c
+ * OpenMAX DL: v1.0.2
+ * Last Modified Revision:   7777
+ * Last Modified Date:       Thu, 27 Sep 2007
+ * 
+ * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
+ * 
+ * 
+ * Description:
+ * Computes the size of the specification structure required.
+ */
+
+#include "dl/api/armOMX.h"
+#include "dl/api/omxtypes.h"
+#include "dl/sp/api/armSP.h"
+#include "dl/sp/api/omxSP.h"
+
+/**
+ * Function: omxSP_FFTGetBufSize_R_S32
+ *
+ * Description:
+ * Computes the size of the specification structure required for the length
+ * 2^order real FFT and IFFT functions.
+ *
+ * Remarks:
+ * This function is used in conjunction with the 32-bit functions
+ * <FFTFwd_RToCCS_S32_Sfs> and <FFTInv_CCSToR_S32_Sfs>.
+ *
+ * Parameters:
+ * [in]  order       base-2 logarithm of the length; valid in the range
+ *                         [0,12].
+ * [out] pSize     pointer to the number of bytes required for the
+ *                         specification structure.
+ *
+ * Return Value:
+ * Standard omxError result. See enumeration for possible result codes.
+ *
+ */
+
+OMXResult omxSP_FFTGetBufSize_R_S32(
+     OMX_INT order,     
+     OMX_INT *pSize
+ )
+{
+    OMX_INT     NBy2,N,twiddleSize;
+    
+    
+    /* Check for order zero */
+    if (order == 0)
+    {
+        *pSize = sizeof(ARMsFFTSpec_R_SC32)
+                + sizeof(OMX_S32) * (2); /* Extra size 'N' is used in FFTInv_CCSToR_S32S16_Sfs as a temporary buf */   
+
+        return OMX_Sts_NoErr;
+    }
+    
+    NBy2 = 1 << (order - 1);
+    N = NBy2<<1;
+    twiddleSize = 5*N/8;            /* 3/4(N/2) + N/4 */
+    
+    /* 2 pointers to store bitreversed array and twiddle factor array */
+    *pSize = sizeof(ARMsFFTSpec_R_SC32)
+        /* Twiddle factors  */
+           + sizeof(OMX_SC32) * twiddleSize
+        /* Ping Pong buffer for doing the N/2 point complex FFT  */      
+           + sizeof(OMX_S32) * (N<<1)  /* Extra size 'N' is used in FFTInv_CCSToR_S32_Sfs as a temporary buf */
+           + 62 ;  /* Extra bytes to get 32 byte alignment of ptwiddle and pBuf */ 
+           
+           
+    return OMX_Sts_NoErr;
+}
+
+/*****************************************************************************
+ *                              END OF FILE
+ *****************************************************************************/
+