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 15 PostDecodeVad::~PostDecodeVad() { 16 if (vad_instance_) 17 WebRtcVad_Free(vad_instance_); 18 } 19 20 void PostDecodeVad::Enable() { 21 if (!vad_instance_) { 22 // Create the instance. 23 vad_instance_ = WebRtcVad_Create(); 24 if (vad_instance_ == nullptr) { 25 // Failed to create instance. 26 Disable(); 27 return; 28 } 29 } 30 Init(); 31 enabled_ = true; 32 } 33 34 void PostDecodeVad::Disable() { 35 enabled_ = false; 36 running_ = false; 37 } 38 39 void PostDecodeVad::Init() { 40 running_ = false; 41 if (vad_instance_) { 42 WebRtcVad_Init(vad_instance_); 43 WebRtcVad_set_mode(vad_instance_, kVadMode); 44 running_ = true; 45 } 46 } 47 48 void PostDecodeVad::Update(int16_t* signal, size_t length, 49 AudioDecoder::SpeechType speech_type, 50 bool sid_frame, 51 int fs_hz) { 52 if (!vad_instance_ || !enabled_) { 53 return; 54 } 55 56 if (speech_type == AudioDecoder::kComfortNoise || sid_frame || 57 fs_hz > 16000) { 58 // TODO(hlundin): Remove restriction on fs_hz. 59 running_ = false; 60 active_speech_ = true; 61 sid_interval_counter_ = 0; 62 } else if (!running_) { 63 ++sid_interval_counter_; 64 } 65 66 if (sid_interval_counter_ >= kVadAutoEnable) { 67 Init(); 68 } 69 70 if (length > 0 && running_) { 71 size_t vad_sample_index = 0; 72 active_speech_ = false; 73 // Loop through frame sizes 30, 20, and 10 ms. 74 for (int vad_frame_size_ms = 30; vad_frame_size_ms >= 10; 75 vad_frame_size_ms -= 10) { 76 size_t vad_frame_size_samples = 77 static_cast<size_t>(vad_frame_size_ms * fs_hz / 1000); 78 while (length - vad_sample_index >= vad_frame_size_samples) { 79 int vad_return = WebRtcVad_Process( 80 vad_instance_, fs_hz, &signal[vad_sample_index], 81 vad_frame_size_samples); 82 active_speech_ |= (vad_return == 1); 83 vad_sample_index += vad_frame_size_samples; 84 } 85 } 86 } 87 } 88 89 } // namespace webrtc 90
