// private int _packetsSent;
private void PrepareAndSendAudioPacket(AudioContext audioContext, short[] audioBuffer)
{
// Apply any custom filters.
ApplyAudioInputFilter(audioBuffer);
//if (++_packetsSent % 100 == 0)
//{
// DebugHelper.AnalyzeAudioFrame("MediaController_PrepareAndSendAudioPacket", audioBuffer, 0, audioBuffer.Length);
//}
if (MediaConfig.EnableDenoise)
{
audioContext.DtxFilter.Filter(audioBuffer);
}
// Check to see if we've succeeded in sending some audio.
if (!AudioSentSuccessfully)
{
AudioSentSuccessfully = !audioContext.DtxFilter.IsSilent;
}
// Set the volume.
if (MediaConfig.ApplyVolumeFilterToRecordedSound)
{
ApplyVolumeFilter(MicrophoneVolume, audioBuffer, 0, audioBuffer.Length);
}
// Compress the audio onto the audioEncodeBuffer.
LastAudioEncoder = audioContext.Encoder.CodecType;
int length = audioContext.Encoder.Encode(audioBuffer, 0, audioBuffer.Length, audioContext.SendBuffer, audioContext.DtxFilter.IsSilent);
// Send the packet
MediaConnection.SendAudioPacket(audioContext.SendBuffer, length, audioContext.Encoder.CodecType, audioContext.DtxFilter.IsSilent, (int)_mediaEnvironment.LocalProcessorLoad);
Logger.LogAudioFrameTransmitted(audioContext.DtxFilter.IsSilent);
}
protected override void OnSamples(long sampleTime, long sampleDuration, byte[] sampleData)
{
try
{
// Raise an event if we managed to successfully capture real audio.
if (!_dataReceived && HasRealAudio(sampleData))
{
ClientLogger.Debug("The AudioSinkAdapter has detected that there's real audio coming in.");
_dataReceived = true;
if (CaptureSuccessful != null)
{
CaptureSuccessful(this, new EventArgs());
}
}
if (_audioContextFactory != null && AudioController != null && AudioController.IsConnected)
{
var ctx = _audioContextFactory.GetAudioContext();
if (ctx != _lastAudioContext)
{
ClientLogger.Debug("Changed audio context: \r\nFrom: {0}\r\nTo: {1}", _lastAudioContext == null ? "" : _lastAudioContext.ToString(), ctx.ToString());
_lastAudioContext = ctx;
}
ctx.Resampler.Write(sampleData);
_logger.LogRawFrame(sampleTime, sampleDuration, sampleData);
bool moreFrames;
do
{
if (ctx.Resampler.Read(ctx.ResampleBuffer, out moreFrames))
{
SubmitFrame(ctx, ctx.ResampleBuffer);
}
} while (moreFrames);
}
}
catch (Exception ex)
{
ClientLogger.Debug(ex.Message);
}
}
/// <summary>
/// Sets the audio frame to be processed before it is transmitted to the media server. Typically called by the RtpAudioSink class.
/// </summary>
/// <param name="audioContext">The audio context for the frame in question</param>
/// <param name="frame">A byte[] array representing the samples received from the local microphone.</param>
public void SubmitRecordedFrame(AudioContext audioContext, byte[] frame)
{
Logger.LogAudioFrameSet();
_microphoneStatistics.LatestFrame = frame;
if (!IsConnected || !OtherMembersInRoom)
{
return;
}
if (IsMicrophoneMuted)
{
frame = _silentBytes;
}
lock (_audioFrames)
{
_audioFrames.Enqueue(new AudioFrame(audioContext, frame));
}
_audioEncodeResetEvent.Set();
}
public AudioFrame(AudioContext audioContext, byte[] samples)
{
AudioContext = audioContext;
Samples = samples;
}
/// <summary>
/// Creates a new instance of the AudioContextFactory.
/// </summary>
/// <param name="rawAudioFormat">The format in which the audio coming directly from the microphone is recorded</param>
/// <param name="playedAudioFormat">The format in which the audio will be played back on the far end (typically 16Khz)</param>
/// <param name="config">The currently active MediaConfig instance</param>
/// <param name="mediaEnvironment">An IMediaEnvironment instance which can be used to make decisions about which context to return, for instance,
/// if the CPU is running too hot, or multiple people have joined the conference.</param>
public AudioContextFactory(AudioFormat rawAudioFormat, AudioFormat playedAudioFormat, MediaConfig config, IMediaEnvironment mediaEnvironment)
{
RawAudioFormat = rawAudioFormat;
PlayedAudioFormat = playedAudioFormat;
MediaConfig = config;
MediaEnvironment = mediaEnvironment;
// What we should use when there's only one other person, and CPU is OK:
// 16Khz, Speex, WebRtc at full strength
var directAudioFormat = new AudioFormat();
var directResampler = new ResampleFilter(rawAudioFormat, directAudioFormat);
directResampler.InstanceName = "High Quality Direct Resampler";
var directEnhancer = new WebRtcFilter(config.ExpectedAudioLatency, config.FilterLength, directAudioFormat, playedAudioFormat, config.EnableAec, config.EnableDenoise, config.EnableAgc);
directEnhancer.InstanceName = "High";
var directDtx = new DtxFilter(directAudioFormat);
var directEncoder = new SpeexEncoder(directAudioFormat);
HighQualityDirectCtx = new AudioContext(directAudioFormat, directResampler, directDtx, directEnhancer, directEncoder);
HighQualityDirectCtx.Description = "High Quality Direct";
// What we should use when there are multiple people (and hence the audio will need to be decoded and mixed), but CPU is OK:
// 8Khz, G711, WebRtc at full strength
var conferenceAudioFormat = new AudioFormat(AudioConstants.NarrowbandSamplesPerSecond);
var conferenceResampler = new ResampleFilter(rawAudioFormat, conferenceAudioFormat);
conferenceResampler.InstanceName = "High Quality Conference Resampler";
var conferenceEnhancer = new WebRtcFilter(config.ExpectedAudioLatency, config.FilterLength, conferenceAudioFormat, playedAudioFormat, config.EnableAec, config.EnableDenoise, config.EnableAgc);
conferenceEnhancer.InstanceName = "Medium";
var conferenceDtx = new DtxFilter(conferenceAudioFormat);
var conferenceEncoder = new G711MuLawEncoder(conferenceAudioFormat);
HighQualityConferenceCtx = new AudioContext(conferenceAudioFormat, conferenceResampler, conferenceDtx, conferenceEnhancer, conferenceEncoder);
HighQualityConferenceCtx.Description = "High Quality Conference";
// What we should use when one or more remote CPU's isn't keeping up (regardless of how many people are in the room):
// 8Khz, G711, WebRtc at full-strength
var remoteFallbackAudioFormat = new AudioFormat(AudioConstants.NarrowbandSamplesPerSecond);
var remoteFallbackResampler = new ResampleFilter(rawAudioFormat, remoteFallbackAudioFormat);
remoteFallbackResampler.InstanceName = "Low Quality Remote CPU Resampler";
var remoteFallbackEnhancer = new WebRtcFilter(config.ExpectedAudioLatency, config.FilterLength, remoteFallbackAudioFormat, playedAudioFormat, config.EnableAec, config.EnableDenoise, config.EnableAgc);
remoteFallbackEnhancer.InstanceName = "Medium";
var remoteFallbackDtx = new DtxFilter(remoteFallbackAudioFormat);
var remoteFallbackEncoder = new G711MuLawEncoder(remoteFallbackAudioFormat);
LowQualityForRemoteCpuCtx = new AudioContext(remoteFallbackAudioFormat, remoteFallbackResampler, remoteFallbackDtx, remoteFallbackEnhancer, remoteFallbackEncoder);
LowQualityForRemoteCpuCtx.Description = "Fallback for remote high CPU";
// What we should use when the local CPU isn't keeping up (regardless of how many people are in the room):
// 8Khz, G711, WebRtc at half-strength
var fallbackAudioFormat = new AudioFormat(AudioConstants.NarrowbandSamplesPerSecond);
var fallbackResampler = new ResampleFilter(rawAudioFormat, fallbackAudioFormat);
fallbackResampler.InstanceName = "Low Quality Local CPU Resampler";
var fallbackEnhancer = new WebRtcFilter(config.ExpectedAudioLatencyFallback, config.FilterLengthFallback, fallbackAudioFormat, playedAudioFormat, config.EnableAec, false, false);
fallbackEnhancer.InstanceName = "Low";
var fallbackDtx = new DtxFilter(fallbackAudioFormat);
var fallbackEncoder = new G711MuLawEncoder(fallbackAudioFormat);
LowQualityForLocalCpuCtx = new AudioContext(fallbackAudioFormat, fallbackResampler, fallbackDtx, fallbackEnhancer, fallbackEncoder);
LowQualityForLocalCpuCtx.Description = "Fallback for local high CPU";
_audioContextAdapter = new EnvironmentAdapter <AudioContext>(mediaEnvironment,
HighQualityDirectCtx,
HighQualityConferenceCtx,
LowQualityForRemoteCpuCtx,
LowQualityForLocalCpuCtx);
}
protected virtual void SubmitFrame(AudioContext audioContext, byte[] frame)
{
AudioController.SubmitRecordedFrame(audioContext, frame);
_logger.AudioFormat = audioContext.AudioFormat;
_logger.LogResampledFrame(frame);
}