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close attention to the details of the entire recruiting, interviewing, and hiring process to make sure there are no accidental parts of the procedure that send any message other than We re not worthy! to your star candidates. Coder Bob Reselman told a poignant story of going to Microsoft to interview.5 When lunchtime came, he was left by himself in a conference room and given a box lunch. This is an absolutely reprehensible way to treat any guest, let alone a potential samurai who is considering coming to defend your village. Even if you ve already written off someone in the morning interviews, they ve gone to enormous trouble, taken off work and maybe flown across the country to volunteer to help you with your problems, and just because they re not going to be a perfect fit is no excuse to treat them with anything less than the utmost in humility and respect. Finally, if you do have to say no to someone, do it quickly and respectfully. You are, of course, under no obligation to tell people why they re not the right fit, but you do have to tell them, and you have to do it promptly. It s just common decency to let them move on to the next opportunity.

{ public class WebCamMSS : MediaStreamSource { WebCamVideoSink vsink = null; WebCamAudioSink asink = null;

<window title="Hello" border="normal"> <button label="Say Hello" onClick="sayHello()"/> <zscript src="sayHello.zs"/> </window>

private Dictionary<MediaSourceAttributesKeys, string> mediaSourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>(); private List<MediaStreamDescription> availableMediaStreams = new List<MediaStreamDescription>(); private Dictionary<MediaSampleAttributeKeys, string> videoSampleAttributes = new Dictionary<MediaSampleAttributeKeys, string>(); bool VideoFormatSelected = false; bool AudioFormatSelected = false; Queue<VideoSample> VideoSampleBuffer = new Queue<VideoSample>(); Queue<AudioSample> AudioSampleBuffer = new Queue<AudioSample>(); object VideoBufferCritSec = new object(); object AudioBufferCritSec = new object(); internal ManualResetEvent AudioSampleRequest = new ManualResetEvent(false); internal ManualResetEvent VideoSampleRequest = new ManualResetEvent(false); internal AutoResetEvent AudioSampleArrived = new AutoResetEvent(false); internal AutoResetEvent VideoSampleArrived = new AutoResetEvent(false); private MediaElement meTarget = null; private CaptureSource _WebCamSource = default(CaptureSource); public CaptureSource WebCamSource { get { return _WebCamSource; } set { if (value != _WebCamSource) { _WebCamSource = value; //attach the sinks to the capture source vsink.CaptureSource = _WebCamSource; asink.CaptureSource = _WebCamSource;

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} } } public WebCamMSS(MediaElement target, WebCamVideoSink vSink, WebCamAudioSink aSink) { meTarget = target; vsink = vSink; asink = aSink; //handle the various sink events vsink.FormatChanged += new EventHandler<VideoFormatChangedEventArgs>(VideoSink_FormatChanged); vsink.SampleGenerated += new EventHandler<VideoSampleEventArgs>(VideoSink_SampleGenerated); asink.FormatChanged += new EventHandler<AudioFormatChangedEventArgs>(AudioSink_FormatChanged); asink.SampleGenerated += new EventHandler<AudioSampleEventArgs>(AudioSink_SampleGenerated); //cannot seek and duration is infinite mediaSourceAttributes.Add(MediaSourceAttributesKeys.CanSeek, false.ToString()); mediaSourceAttributes.Add(MediaSourceAttributesKeys.Duration, TimeSpan.MaxValue.Ticks.ToString()); //create the background workers to handle incoming samples BackgroundWorker VideoSampleDispatch = new BackgroundWorker(); BackgroundWorker AudioSampleDispatch = new BackgroundWorker(); VideoSampleDispatch.DoWork += new DoWorkEventHandler(VideoSampleDispatch_DoWork); AudioSampleDispatch.DoWork += new DoWorkEventHandler(AudioSampleDispatch_DoWork); //run the background workers VideoSampleDispatch.RunWorkerAsync(this); AudioSampleDispatch.RunWorkerAsync(this); } void AudioSink_FormatChanged(object sender, AudioFormatChangedEventArgs e) { //switch context to the thread the MSS was created on (UI thread)

meTarget.Dispatcher.BeginInvoke(new Action(() => { if (_WebCamSource.AudioCaptureDevice != null) { //set the audio capture device format _WebCamSource.AudioCaptureDevice.DesiredFormat = e.Format; //create WaveFormatEx instance and populate from format information WaveFormatEx wfex = new WaveFormatEx() { //bits per sample BitsPerSample = (ushort)e.Format.BitsPerSample, //always PCM FormatTag = WaveFormatEx.WAVE_FORMAT_PCM, //channel count Channels = (ushort)e.Format.Channels, //samples per sec SamplesPerSecond = (uint)e.Format.SamplesPerSecond }; //add WaveFormatEx as codec private data availableMediaStreams.Add( new MediaStreamDescription(MediaStreamType.Audio, new Dictionary<MediaStreamAttributeKeys, string>() { {MediaStreamAttributeKeys.CodecPrivateData, wfex.ToCodecDataString()} })); //set flag to indicate audio format processing is done AudioFormatSelected = true; } if (VideoFormatSelected && AudioFormatSelected) { //if both formats have been processed, //attach the MSS to the MediaElement meTarget.SetSource(this); } } )); } void VideoSink_FormatChanged(object sender, VideoFormatChangedEventArgs e) { //switch context to the thread the MSS was created on (UI thread) meTarget.Dispatcher.BeginInvoke(new Action(() => {

if (_WebCamSource.VideoCaptureDevice != null) { //set the video capture device format _WebCamSource.VideoCaptureDevice.DesiredFormat = e.Format; //add stream attributes availableMediaStreams.Add( new MediaStreamDescription(MediaStreamType.Video, new Dictionary<MediaStreamAttributeKeys, string>() { //FourCC code - we are processing 32 bit RGBA saqmples {MediaStreamAttributeKeys.VideoFourCC,"RGBA"}, //frame height {MediaStreamAttributeKeys.Height,e.Format.PixelHeight.ToString()}, //frame width {MediaStreamAttributeKeys.Width,e.Format.PixelWidth.ToString()}, //not need for codec private data - RGBA is uncompressed {MediaStreamAttributeKeys.CodecPrivateData,String.Empty} } ) ); //add sample attributes - frame height and frame width videoSampleAttributes.Add(MediaSampleAttributeKeys.FrameHeight, e.Format.PixelHeight.ToString()); videoSampleAttributes.Add(MediaSampleAttributeKeys.FrameWidth, e.Format.PixelWidth.ToString()); //set format selection flag VideoFormatSelected = true; } //if both formats are set if (VideoFormatSelected && AudioFormatSelected) { //attach MSS to ME meTarget.SetSource(this); } })); } void VideoSink_SampleGenerated(object sender, VideoSampleEventArgs e) { lock (VideoBufferCritSec) { //enque the audio sample VideoSampleBuffer.Enqueue(e.Sample); }

Just like you can in JSP pages, you can use EL expressions in any part of ZUML pages, except within the names of attributes, elements, and processing instructions. ZUML EL expressions use the same syntax as JSP EL expressions, that is, ${expr}. See Listing 4-12 for an example.

//signal sample arrival this.VideoSampleArrived.Set(); } void AudioSink_SampleGenerated(object sender, AudioSampleEventArgs e) { lock (AudioBufferCritSec) { //enque the audio sample AudioSampleBuffer.Enqueue(e.Sample); } //signal sample arrival this.AudioSampleArrived.Set(); } protected override void GetSampleAsync(MediaStreamType mediaStreamType) { if (mediaStreamType == MediaStreamType.Audio) { //signal audio sample request to sample processing loop AudioSampleRequest.Set(); } else if (mediaStreamType == MediaStreamType.Video) { //signal video sample request to sample processing loop VideoSampleRequest.Set(); } } void AudioSampleDispatch_DoWork(object sender, DoWorkEventArgs e) { //keep running while (true) { //wait for sample request this.AudioSampleRequest.WaitOne(); //request arrived - is there a sample to dispatch if (this.AudioSampleBuffer.Count > 0) { AudioSample audSample = null; lock (this.AudioBufferCritSec) { //dequeue sample audSample = this.AudioSampleBuffer.Dequeue(); } //flatten sample and report sample

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