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/*
* 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/modules/audio_processing/voice_detection_impl.h"
#include <assert.h>
#include "webrtc/common_audio/vad/include/webrtc_vad.h"
#include "webrtc/modules/audio_processing/audio_buffer.h"
#include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
namespace webrtc {
typedef VadInst Handle;
namespace {
int MapSetting(VoiceDetection::Likelihood likelihood) {
switch (likelihood) {
case VoiceDetection::kVeryLowLikelihood:
return 3;
case VoiceDetection::kLowLikelihood:
return 2;
case VoiceDetection::kModerateLikelihood:
return 1;
case VoiceDetection::kHighLikelihood:
return 0;
}
assert(false);
return -1;
}
} // namespace
VoiceDetectionImpl::VoiceDetectionImpl(const AudioProcessing* apm,
CriticalSectionWrapper* crit)
: ProcessingComponent(),
apm_(apm),
crit_(crit),
stream_has_voice_(false),
using_external_vad_(false),
likelihood_(kLowLikelihood),
frame_size_ms_(10),
frame_size_samples_(0) {}
VoiceDetectionImpl::~VoiceDetectionImpl() {}
int VoiceDetectionImpl::ProcessCaptureAudio(AudioBuffer* audio) {
if (!is_component_enabled()) {
return apm_->kNoError;
}
if (using_external_vad_) {
using_external_vad_ = false;
return apm_->kNoError;
}
assert(audio->samples_per_split_channel() <= 160);
// TODO(ajm): concatenate data in frame buffer here.
int vad_ret = WebRtcVad_Process(static_cast<Handle*>(handle(0)),
apm_->proc_split_sample_rate_hz(),
audio->mixed_low_pass_data(),
frame_size_samples_);
if (vad_ret == 0) {
stream_has_voice_ = false;
audio->set_activity(AudioFrame::kVadPassive);
} else if (vad_ret == 1) {
stream_has_voice_ = true;
audio->set_activity(AudioFrame::kVadActive);
} else {
return apm_->kUnspecifiedError;
}
return apm_->kNoError;
}
int VoiceDetectionImpl::Enable(bool enable) {
CriticalSectionScoped crit_scoped(crit_);
return EnableComponent(enable);
}
bool VoiceDetectionImpl::is_enabled() const {
return is_component_enabled();
}
int VoiceDetectionImpl::set_stream_has_voice(bool has_voice) {
using_external_vad_ = true;
stream_has_voice_ = has_voice;
return apm_->kNoError;
}
bool VoiceDetectionImpl::stream_has_voice() const {
// TODO(ajm): enable this assertion?
//assert(using_external_vad_ || is_component_enabled());
return stream_has_voice_;
}
int VoiceDetectionImpl::set_likelihood(VoiceDetection::Likelihood likelihood) {
CriticalSectionScoped crit_scoped(crit_);
if (MapSetting(likelihood) == -1) {
return apm_->kBadParameterError;
}
likelihood_ = likelihood;
return Configure();
}
VoiceDetection::Likelihood VoiceDetectionImpl::likelihood() const {
return likelihood_;
}
int VoiceDetectionImpl::set_frame_size_ms(int size) {
CriticalSectionScoped crit_scoped(crit_);
assert(size == 10); // TODO(ajm): remove when supported.
if (size != 10 &&
size != 20 &&
size != 30) {
return apm_->kBadParameterError;
}
frame_size_ms_ = size;
return Initialize();
}
int VoiceDetectionImpl::frame_size_ms() const {
return frame_size_ms_;
}
int VoiceDetectionImpl::Initialize() {
int err = ProcessingComponent::Initialize();
if (err != apm_->kNoError || !is_component_enabled()) {
return err;
}
using_external_vad_ = false;
frame_size_samples_ = frame_size_ms_ *
apm_->proc_split_sample_rate_hz() / 1000;
// TODO(ajm): intialize frame buffer here.
return apm_->kNoError;
}
void* VoiceDetectionImpl::CreateHandle() const {
Handle* handle = NULL;
if (WebRtcVad_Create(&handle) != apm_->kNoError) {
handle = NULL;
} else {
assert(handle != NULL);
}
return handle;
}
void VoiceDetectionImpl::DestroyHandle(void* handle) const {
WebRtcVad_Free(static_cast<Handle*>(handle));
}
int VoiceDetectionImpl::InitializeHandle(void* handle) const {
return WebRtcVad_Init(static_cast<Handle*>(handle));
}
int VoiceDetectionImpl::ConfigureHandle(void* handle) const {
return WebRtcVad_set_mode(static_cast<Handle*>(handle),
MapSetting(likelihood_));
}
int VoiceDetectionImpl::num_handles_required() const {
return 1;
}
int VoiceDetectionImpl::GetHandleError(void* handle) const {
// The VAD has no get_error() function.
assert(handle != NULL);
return apm_->kUnspecifiedError;
}
} // namespace webrtc
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