Rename neteq4 folder to neteq

Keep the old neteq4/audio_decoder_unittests.isolate while waiting for
a hard-coded reference to change.

This CL effectively reverts r6257 "Rename neteq4 folder to neteq".

BUG=2996
TBR=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/21629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6367 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_coding/neteq/post_decode_vad.cc

@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2013 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/modules/audio_coding/neteq/post_decode_vad.h"
+
+namespace webrtc {
+
+PostDecodeVad::~PostDecodeVad() {
+  if (vad_instance_)
+    WebRtcVad_Free(vad_instance_);
+}
+
+void PostDecodeVad::Enable() {
+  if (!vad_instance_) {
+    // Create the instance.
+    if (WebRtcVad_Create(&vad_instance_) != 0) {
+      // Failed to create instance.
+      Disable();
+      return;
+    }
+  }
+  Init();
+  enabled_ = true;
+}
+
+void PostDecodeVad::Disable() {
+  enabled_ = false;
+  running_ = false;
+}
+
+void PostDecodeVad::Init() {
+  running_ = false;
+  if (vad_instance_) {
+    WebRtcVad_Init(vad_instance_);
+    WebRtcVad_set_mode(vad_instance_, kVadMode);
+    running_ = true;
+  }
+}
+
+void PostDecodeVad::Update(int16_t* signal, int length,
+                           AudioDecoder::SpeechType speech_type,
+                           bool sid_frame,
+                           int fs_hz) {
+  if (!vad_instance_ || !enabled_) {
+    return;
+  }
+
+  if (speech_type == AudioDecoder::kComfortNoise || sid_frame ||
+      fs_hz > 16000) {
+    // TODO(hlundin): Remove restriction on fs_hz.
+    running_ = false;
+    active_speech_ = true;
+    sid_interval_counter_ = 0;
+  } else if (!running_) {
+    ++sid_interval_counter_;
+  }
+
+  if (sid_interval_counter_ >= kVadAutoEnable) {
+    Init();
+  }
+
+  if (length > 0 && running_) {
+    int vad_sample_index = 0;
+    active_speech_ = false;
+    // Loop through frame sizes 30, 20, and 10 ms.
+    for (int vad_frame_size_ms = 30; vad_frame_size_ms >= 10;
+        vad_frame_size_ms -= 10) {
+      int vad_frame_size_samples = vad_frame_size_ms * fs_hz / 1000;
+      while (length - vad_sample_index >= vad_frame_size_samples) {
+        int vad_return = WebRtcVad_Process(
+            vad_instance_, fs_hz, &signal[vad_sample_index],
+            vad_frame_size_samples);
+        active_speech_ |= (vad_return == 1);
+        vad_sample_index += vad_frame_size_samples;
+      }
+    }
+  }
+}
+
+}  // namespace webrtc