blob: 343cea993869f0e1af70edeca3ec1e5e91083c01 [file] [log] [blame]
* 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.
// This sub-API supports the following functionalities:
// - Noise Suppression (NS).
// - Automatic Gain Control (AGC).
// - Echo Control (EC).
// - Receiving side VAD, NS and AGC.
// - Measurements of instantaneous speech, noise and echo levels.
// - Generation of AP debug recordings.
// - Detection of keyboard typing which can disrupt a voice conversation.
// Usage example, omitting error checking:
// using namespace webrtc;
// VoiceEngine* voe = VoiceEngine::Create();
// VoEBase* base = VoEBase::GetInterface();
// VoEAudioProcessing* ap = VoEAudioProcessing::GetInterface(voe);
// base->Init();
// ap->SetEcStatus(true, kAgcAdaptiveAnalog);
// ...
// base->Terminate();
// base->Release();
// ap->Release();
// VoiceEngine::Delete(voe);
#include <stdio.h>
#include "webrtc/common_types.h"
namespace webrtc {
class VoiceEngine;
// VoEAudioProcessing
class WEBRTC_DLLEXPORT VoEAudioProcessing {
// Factory for the VoEAudioProcessing sub-API. Increases an internal
// reference counter if successful. Returns NULL if the API is not
// supported or if construction fails.
static VoEAudioProcessing* GetInterface(VoiceEngine* voiceEngine);
// Releases the VoEAudioProcessing sub-API and decreases an internal
// reference counter. Returns the new reference count. This value should
// be zero for all sub-API:s before the VoiceEngine object can be safely
// deleted.
virtual int Release() = 0;
// Sets Noise Suppression (NS) status and mode.
// The NS reduces noise in the microphone signal.
virtual int SetNsStatus(bool enable, NsModes mode = kNsUnchanged) = 0;
// Gets the NS status and mode.
virtual int GetNsStatus(bool& enabled, NsModes& mode) = 0;
// Sets the Automatic Gain Control (AGC) status and mode.
// The AGC adjusts the microphone signal to an appropriate level.
virtual int SetAgcStatus(bool enable, AgcModes mode = kAgcUnchanged) = 0;
// Gets the AGC status and mode.
virtual int GetAgcStatus(bool& enabled, AgcModes& mode) = 0;
// Sets the AGC configuration.
// Should only be used in situations where the working environment
// is well known.
virtual int SetAgcConfig(AgcConfig config) = 0;
// Gets the AGC configuration.
virtual int GetAgcConfig(AgcConfig& config) = 0;
// Sets the Echo Control (EC) status and mode.
// The EC mitigates acoustic echo where a user can hear their own
// speech repeated back due to an acoustic coupling between the
// speaker and the microphone at the remote end.
virtual int SetEcStatus(bool enable, EcModes mode = kEcUnchanged) = 0;
// Gets the EC status and mode.
virtual int GetEcStatus(bool& enabled, EcModes& mode) = 0;
// Enables the compensation of clock drift between the capture and render
// streams by the echo canceller (i.e. only using EcMode==kEcAec). It will
// only be enabled if supported on the current platform; otherwise an error
// will be returned. Check if the platform is supported by calling
// |DriftCompensationSupported()|.
virtual int EnableDriftCompensation(bool enable) = 0;
virtual bool DriftCompensationEnabled() = 0;
static bool DriftCompensationSupported();
// Sets a delay |offset| in ms to add to the system delay reported by the
// OS, which is used by the AEC to synchronize far- and near-end streams.
// In some cases a system may introduce a delay which goes unreported by the
// OS, but which is known to the user. This method can be used to compensate
// for the unreported delay.
virtual void SetDelayOffsetMs(int offset) = 0;
virtual int DelayOffsetMs() = 0;
// Modifies settings for the AEC designed for mobile devices (AECM).
virtual int SetAecmMode(AecmModes mode = kAecmSpeakerphone,
bool enableCNG = true) = 0;
// Gets settings for the AECM.
virtual int GetAecmMode(AecmModes& mode, bool& enabledCNG) = 0;
// Enables a high pass filter on the capture signal. This removes DC bias
// and low-frequency noise. Recommended to be enabled.
virtual int EnableHighPassFilter(bool enable) = 0;
virtual bool IsHighPassFilterEnabled() = 0;
// Gets the VAD/DTX activity for the specified |channel|.
// The returned value is 1 if frames of audio contains speech
// and 0 if silence. The output is always 1 if VAD is disabled.
virtual int VoiceActivityIndicator(int channel) = 0;
// Enables or disables the possibility to retrieve echo metrics and delay
// logging values during an active call. The metrics are only supported in
// AEC.
virtual int SetEcMetricsStatus(bool enable) = 0;
// Gets the current EC metric status.
virtual int GetEcMetricsStatus(bool& enabled) = 0;
// Gets the instantaneous echo level metrics.
virtual int GetEchoMetrics(int& ERL, int& ERLE, int& RERL, int& A_NLP) = 0;
// Gets the EC internal |delay_median| and |delay_std| in ms between
// near-end and far-end. The metric |fraction_poor_delays| is the amount of
// delay values that potentially can break the EC. The values are aggregated
// over one second and the last updated metrics are returned.
virtual int GetEcDelayMetrics(int& delay_median,
int& delay_std,
float& fraction_poor_delays) = 0;
// Enables recording of Audio Processing (AP) debugging information.
// The file can later be used for off-line analysis of the AP performance.
virtual int StartDebugRecording(const char* fileNameUTF8) = 0;
// Same as above but sets and uses an existing file handle. Takes ownership
// of |file_handle| and passes it on to the audio processing module.
virtual int StartDebugRecording(FILE* file_handle) = 0;
// Disables recording of AP debugging information.
virtual int StopDebugRecording() = 0;
// Enables or disables detection of disturbing keyboard typing.
// An error notification will be given as a callback upon detection.
virtual int SetTypingDetectionStatus(bool enable) = 0;
// Gets the current typing detection status.
virtual int GetTypingDetectionStatus(bool& enabled) = 0;
// Reports the lower of:
// * Time in seconds since the last typing event.
// * Time in seconds since the typing detection was enabled.
// Returns error if typing detection is disabled.
virtual int TimeSinceLastTyping(int& seconds) = 0;
// Optional setting of typing detection parameters
// Parameter with value == 0 will be ignored
// and left with default config.
// TODO(niklase) Remove default argument as soon as libJingle is updated!
virtual int SetTypingDetectionParameters(int timeWindow,
int costPerTyping,
int reportingThreshold,
int penaltyDecay,
int typeEventDelay = 0) = 0;
// Swaps the capture-side left and right audio channels when enabled. It
// only has an effect when using a stereo send codec. The setting is
// persistent; it will be applied whenever a stereo send codec is enabled.
// The swap is applied only to the captured audio, and not mixed files. The
// swap will appear in file recordings and when accessing audio through the
// external media interface.
virtual void EnableStereoChannelSwapping(bool enable) = 0;
virtual bool IsStereoChannelSwappingEnabled() = 0;
VoEAudioProcessing() {}
virtual ~VoEAudioProcessing() {}
} // namespace webrtc