101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
|
/*
|
||
|
|
* 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 "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
|
||
|
|
#include "webrtc/modules/include/module_common_types.h"
|
||
|
|
#include "webrtc/voice_engine/level_indicator.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
namespace voe {
|
||
|
|
|
||
|
|
// Number of bars on the indicator.
|
||
|
|
// Note that the number of elements is specified because we are indexing it
|
||
|
|
// in the range of 0-32
|
||
|
|
const int8_t permutation[33] =
|
||
|
|
{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};
|
||
|
|
|
||
|
|
|
||
|
|
AudioLevel::AudioLevel() :
|
||
|
|
_absMax(0),
|
||
|
|
_count(0),
|
||
|
|
_currentLevel(0),
|
||
|
|
_currentLevelFullRange(0) {
|
||
|
|
}
|
||
|
|
|
||
|
|
AudioLevel::~AudioLevel() {
|
||
|
|
}
|
||
|
|
|
||
|
|
void AudioLevel::Clear()
|
||
|
|
{
|
||
|
|
rtc::CritScope cs(&_critSect);
|
||
|
|
_absMax = 0;
|
||
|
|
_count = 0;
|
||
|
|
_currentLevel = 0;
|
||
|
|
_currentLevelFullRange = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void AudioLevel::ComputeLevel(const AudioFrame& audioFrame)
|
||
|
|
{
|
||
|
|
int16_t absValue(0);
|
||
|
|
|
||
|
|
// Check speech level (works for 2 channels as well)
|
||
|
|
absValue = WebRtcSpl_MaxAbsValueW16(
|
||
|
|
audioFrame.data_,
|
||
|
|
audioFrame.samples_per_channel_*audioFrame.num_channels_);
|
||
|
|
|
||
|
|
// Protect member access using a lock since this method is called on a
|
||
|
|
// dedicated audio thread in the RecordedDataIsAvailable() callback.
|
||
|
|
rtc::CritScope cs(&_critSect);
|
||
|
|
|
||
|
|
if (absValue > _absMax)
|
||
|
|
_absMax = absValue;
|
||
|
|
|
||
|
|
// Update level approximately 10 times per second
|
||
|
|
if (_count++ == kUpdateFrequency)
|
||
|
|
{
|
||
|
|
_currentLevelFullRange = _absMax;
|
||
|
|
|
||
|
|
_count = 0;
|
||
|
|
|
||
|
|
// Highest value for a int16_t is 0x7fff = 32767
|
||
|
|
// Divide with 1000 to get in the range of 0-32 which is the range of
|
||
|
|
// the permutation vector
|
||
|
|
int32_t position = _absMax/1000;
|
||
|
|
|
||
|
|
// Make it less likely that the bar stays at position 0. I.e. only if
|
||
|
|
// its in the range 0-250 (instead of 0-1000)
|
||
|
|
if ((position == 0) && (_absMax > 250))
|
||
|
|
{
|
||
|
|
position = 1;
|
||
|
|
}
|
||
|
|
_currentLevel = permutation[position];
|
||
|
|
|
||
|
|
// Decay the absolute maximum (divide by 4)
|
||
|
|
_absMax >>= 2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int8_t AudioLevel::Level() const
|
||
|
|
{
|
||
|
|
rtc::CritScope cs(&_critSect);
|
||
|
|
return _currentLevel;
|
||
|
|
}
|
||
|
|
|
||
|
|
int16_t AudioLevel::LevelFullRange() const
|
||
|
|
{
|
||
|
|
rtc::CritScope cs(&_critSect);
|
||
|
|
return _currentLevelFullRange;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace voe
|
||
|
|
|
||
|
|
} // namespace webrtc
|