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      1 /*
      2  * Copyright (C) 2010, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "VectorMath.h"
     30 
     31 #if OS(DARWIN)
     32 #include <Accelerate/Accelerate.h>
     33 #endif
     34 
     35 namespace WebCore {
     36 
     37 namespace VectorMath {
     38 
     39 #if OS(DARWIN)
     40 // On the Mac we use the highly optimized versions in Accelerate.framework
     41 // In 32-bit mode (__ppc__ or __i386__) <Accelerate/Accelerate.h> includes <vecLib/vDSP_translate.h> which defines macros of the same name as
     42 // our namespaced function names, so we must handle this case differently.  Other architectures (64bit, ARM, etc.) do not include this header file.
     43 
     44 void vsmul(const float* sourceP, int sourceStride, const float* scale, float* destP, int destStride, size_t framesToProcess)
     45 {
     46 #if defined(__ppc__) || defined(__i386__)
     47     ::vsmul(sourceP, sourceStride, scale, destP, destStride, framesToProcess);
     48 #else
     49     vDSP_vsmul(sourceP, sourceStride, scale, destP, destStride, framesToProcess);
     50 #endif
     51 }
     52 
     53 void vadd(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess)
     54 {
     55 #if defined(__ppc__) || defined(__i386__)
     56     ::vadd(source1P, sourceStride1, source2P, sourceStride2, destP, destStride, framesToProcess);
     57 #else
     58     vDSP_vadd(source1P, sourceStride1, source2P, sourceStride2, destP, destStride, framesToProcess);
     59 #endif
     60 }
     61 
     62 #else
     63 
     64 void vsmul(const float* sourceP, int sourceStride, const float* scale, float* destP, int destStride, size_t framesToProcess)
     65 {
     66     // FIXME: optimize for SSE
     67     int n = framesToProcess;
     68     float k = *scale;
     69     while (n--) {
     70         *destP = k * *sourceP;
     71         sourceP += sourceStride;
     72         destP += destStride;
     73     }
     74 }
     75 
     76 void vadd(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess)
     77 {
     78     // FIXME: optimize for SSE
     79     int n = framesToProcess;
     80     while (n--) {
     81         *destP = *source1P + *source2P;
     82         source1P += sourceStride1;
     83         source2P += sourceStride2;
     84         destP += destStride;
     85     }
     86 }
     87 
     88 #endif // OS(DARWIN)
     89 
     90 } // namespace VectorMath
     91 
     92 } // namespace WebCore
     93 
     94 #endif // ENABLE(WEB_AUDIO)
     95