diff options
Diffstat (limited to 'third_party/webrtc/src/webrtc/common_audio/signal_processing/get_scaling_square.c')
-rw-r--r-- | third_party/webrtc/src/webrtc/common_audio/signal_processing/get_scaling_square.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/third_party/webrtc/src/webrtc/common_audio/signal_processing/get_scaling_square.c b/third_party/webrtc/src/webrtc/common_audio/signal_processing/get_scaling_square.c new file mode 100644 index 00000000..82e3c8b0 --- /dev/null +++ b/third_party/webrtc/src/webrtc/common_audio/signal_processing/get_scaling_square.c @@ -0,0 +1,46 @@ +/* + * 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_GetScalingSquare(). + * The description header can be found in signal_processing_library.h + * + */ + +#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" + +int16_t WebRtcSpl_GetScalingSquare(int16_t* in_vector, + size_t in_vector_length, + size_t times) +{ + int16_t nbits = WebRtcSpl_GetSizeInBits((uint32_t)times); + size_t i; + int16_t smax = -1; + int16_t sabs; + int16_t *sptr = in_vector; + int16_t t; + size_t looptimes = in_vector_length; + + for (i = looptimes; i > 0; i--) + { + sabs = (*sptr > 0 ? *sptr++ : -*sptr++); + smax = (sabs > smax ? sabs : smax); + } + t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax)); + + if (smax == 0) + { + return 0; // Since norm(0) returns 0 + } else + { + return (t > nbits) ? 0 : nbits - t; + } +} |