diff options
Diffstat (limited to 'third_party/webrtc/src/webrtc/common_audio/signal_processing/energy.c')
-rw-r--r-- | third_party/webrtc/src/webrtc/common_audio/signal_processing/energy.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/third_party/webrtc/src/webrtc/common_audio/signal_processing/energy.c b/third_party/webrtc/src/webrtc/common_audio/signal_processing/energy.c new file mode 100644 index 00000000..e83f1a69 --- /dev/null +++ b/third_party/webrtc/src/webrtc/common_audio/signal_processing/energy.c @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2011 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 contains the function WebRtcSpl_Energy(). + * The description header can be found in signal_processing_library.h + * + */ + +#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" + +int32_t WebRtcSpl_Energy(int16_t* vector, + size_t vector_length, + int* scale_factor) +{ + int32_t en = 0; + size_t i; + int scaling = + WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length); + size_t looptimes = vector_length; + int16_t *vectorptr = vector; + + for (i = 0; i < looptimes; i++) + { + en += (*vectorptr * *vectorptr) >> scaling; + vectorptr++; + } + *scale_factor = scaling; + + return en; +} |