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author | andrew@webrtc.org <andrew@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> | 2012-10-22 18:19:23 +0000 |
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committer | andrew@webrtc.org <andrew@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> | 2012-10-22 18:19:23 +0000 |
commit | b015cbede88899f67a53fbbe581b02ce8e327949 (patch) | |
tree | 530a64a3cfdbbabacab974c183326517d49e761e /common_audio/signal_processing/dot_product_with_scale.c | |
download | webrtc-b015cbede88899f67a53fbbe581b02ce8e327949.tar.gz |
Move src/ -> webrtc/
TBR=niklas.enbom@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/915006
git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@2963 4adac7df-926f-26a2-2b94-8c16560cd09d
Diffstat (limited to 'common_audio/signal_processing/dot_product_with_scale.c')
-rw-r--r-- | common_audio/signal_processing/dot_product_with_scale.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/common_audio/signal_processing/dot_product_with_scale.c b/common_audio/signal_processing/dot_product_with_scale.c new file mode 100644 index 00000000..48682609 --- /dev/null +++ b/common_audio/signal_processing/dot_product_with_scale.c @@ -0,0 +1,32 @@ +/* + * Copyright (c) 2012 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. + */ + +#include "signal_processing_library.h" + +int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1, + const int16_t* vector2, + int length, + int scaling) { + int32_t sum = 0; + int i = 0; + + /* Unroll the loop to improve performance. */ + for (i = 0; i < length - 3; i += 4) { + sum += (vector1[i + 0] * vector2[i + 0]) >> scaling; + sum += (vector1[i + 1] * vector2[i + 1]) >> scaling; + sum += (vector1[i + 2] * vector2[i + 2]) >> scaling; + sum += (vector1[i + 3] * vector2[i + 3]) >> scaling; + } + for (; i < length; i++) { + sum += (vector1[i] * vector2[i]) >> scaling; + } + + return sum; +} |