1 /*
2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "webrtc/modules/audio_coding/neteq/post_decode_vad.h"
12
13 namespace webrtc {
14
~PostDecodeVad()15 PostDecodeVad::~PostDecodeVad() {
16 if (vad_instance_)
17 WebRtcVad_Free(vad_instance_);
18 }
19
Enable()20 void PostDecodeVad::Enable() {
21 if (!vad_instance_) {
22 // Create the instance.
23 if (WebRtcVad_Create(&vad_instance_) != 0) {
24 // Failed to create instance.
25 Disable();
26 return;
27 }
28 }
29 Init();
30 enabled_ = true;
31 }
32
Disable()33 void PostDecodeVad::Disable() {
34 enabled_ = false;
35 running_ = false;
36 }
37
Init()38 void PostDecodeVad::Init() {
39 running_ = false;
40 if (vad_instance_) {
41 WebRtcVad_Init(vad_instance_);
42 WebRtcVad_set_mode(vad_instance_, kVadMode);
43 running_ = true;
44 }
45 }
46
Update(int16_t * signal,int length,AudioDecoder::SpeechType speech_type,bool sid_frame,int fs_hz)47 void PostDecodeVad::Update(int16_t* signal, int length,
48 AudioDecoder::SpeechType speech_type,
49 bool sid_frame,
50 int fs_hz) {
51 if (!vad_instance_ || !enabled_) {
52 return;
53 }
54
55 if (speech_type == AudioDecoder::kComfortNoise || sid_frame ||
56 fs_hz > 16000) {
57 // TODO(hlundin): Remove restriction on fs_hz.
58 running_ = false;
59 active_speech_ = true;
60 sid_interval_counter_ = 0;
61 } else if (!running_) {
62 ++sid_interval_counter_;
63 }
64
65 if (sid_interval_counter_ >= kVadAutoEnable) {
66 Init();
67 }
68
69 if (length > 0 && running_) {
70 int vad_sample_index = 0;
71 active_speech_ = false;
72 // Loop through frame sizes 30, 20, and 10 ms.
73 for (int vad_frame_size_ms = 30; vad_frame_size_ms >= 10;
74 vad_frame_size_ms -= 10) {
75 int vad_frame_size_samples = vad_frame_size_ms * fs_hz / 1000;
76 while (length - vad_sample_index >= vad_frame_size_samples) {
77 int vad_return = WebRtcVad_Process(
78 vad_instance_, fs_hz, &signal[vad_sample_index],
79 vad_frame_size_samples);
80 active_speech_ |= (vad_return == 1);
81 vad_sample_index += vad_frame_size_samples;
82 }
83 }
84 }
85 }
86
87 } // namespace webrtc
88