Update formatting of AudioLevel class

webrtc/voice_engine/audio_level.cc

+/*
+ *  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/voice_engine/audio_level.h"
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+#include "webrtc/modules/include/module_common_types.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
+constexpr int8_t kPermutation[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()
+    : abs_max_(0), count_(0), current_level_(0), current_level_full_range_(0) {
+  WebRtcSpl_Init();
+}
+
+AudioLevel::~AudioLevel() {}
+
+int8_t AudioLevel::Level() const {
+  rtc::CritScope cs(&crit_sect_);
+  return current_level_;
+}
+
+int16_t AudioLevel::LevelFullRange() const {
+  rtc::CritScope cs(&crit_sect_);
+  return current_level_full_range_;
+}
+
+void AudioLevel::Clear() {
+  rtc::CritScope cs(&crit_sect_);
+  abs_max_ = 0;
+  count_ = 0;
+  current_level_ = 0;
+  current_level_full_range_ = 0;
+}
+
+void AudioLevel::ComputeLevel(const AudioFrame& audioFrame) {
+  // Check speech level (works for 2 channels as well)
+  int16_t abs_value = 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(&crit_sect_);
+
+  if (abs_value > abs_max_)
+    abs_max_ = abs_value;
+
+  // Update level approximately 10 times per second
+  if (count_++ == kUpdateFrequency) {
+    current_level_full_range_ = abs_max_;
+
+    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 = abs_max_ / 1000;
+
+    // Make it less likely that the bar stays at position 0. I.e. only if it's
+    // in the range 0-250 (instead of 0-1000)
+    if ((position == 0) && (abs_max_ > 250)) {
+      position = 1;
+    }
+    current_level_ = kPermutation[position];
+
+    // Decay the absolute maximum (divide by 4)
+    abs_max_ >>= 2;
+  }
+}
+
+}  // namespace voe
+}  // namespace webrtc