2011-07-07 10:21:25 +02:00
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/*
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2012-05-03 01:56:37 +02:00
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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2011-07-07 10:21:25 +02:00
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "level_indicator.h"
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#include "module_common_types.h"
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#include "signal_processing_library.h"
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namespace webrtc {
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namespace voe {
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// Number of bars on the indicator.
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// Note that the number of elements is specified because we are indexing it
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// in the range of 0-32
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const WebRtc_Word8 permutation[33] =
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{0,1,2,3,4,4,5,5,5,5,6,6,6,6,6,7,7,7,7,8,8,8,9,9,9,9,9,9,9,9,9,9,9};
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AudioLevel::AudioLevel() :
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_absMax(0),
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_count(0),
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_currentLevel(0),
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_currentLevelFullRange(0)
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{
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}
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AudioLevel::~AudioLevel()
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{
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}
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void
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AudioLevel::Clear()
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{
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_absMax = 0;
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_count = 0;
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_currentLevel = 0;
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_currentLevelFullRange = 0;
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}
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void
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AudioLevel::ComputeLevel(const AudioFrame& audioFrame)
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{
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WebRtc_Word16 absValue(0);
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// Check speech level (works for 2 channels as well)
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absValue = WebRtcSpl_MaxAbsValueW16(
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2012-05-03 01:56:37 +02:00
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audioFrame.data_,
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audioFrame.samples_per_channel_*audioFrame.num_channels_);
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2011-07-07 10:21:25 +02:00
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if (absValue > _absMax)
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_absMax = absValue;
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// Update level approximately 10 times per second
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if (_count++ == kUpdateFrequency)
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{
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_currentLevelFullRange = _absMax;
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_count = 0;
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// Highest value for a WebRtc_Word16 is 0x7fff = 32767
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// Divide with 1000 to get in the range of 0-32 which is the range of
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// the permutation vector
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WebRtc_Word32 position = _absMax/1000;
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// Make it less likely that the bar stays at position 0. I.e. only if
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// its in the range 0-250 (instead of 0-1000)
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if ((position == 0) && (_absMax > 250))
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{
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position = 1;
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}
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_currentLevel = permutation[position];
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// Decay the absolute maximum (divide by 4)
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_absMax >>= 2;
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}
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}
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WebRtc_Word8
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AudioLevel::Level() const
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{
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return _currentLevel;
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}
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WebRtc_Word16
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AudioLevel::LevelFullRange() const
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{
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return _currentLevelFullRange;
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}
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} // namespace voe
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} // namespace webrtc
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