2. Creating apps that use video and audio
Windows Azure
4/20/2017
Creating apps that use video and audio
Gabe Frost
Senior Program Manager, Lead
2-087
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

3. Agenda A recap of video and audio What’s new for 8.1
Completing your audio experience
Completing your video experience
Better together with Xbox One

4. A recap of video and audio
Desktop apps use IMFMediaEngine, etc.
Windows.Media namespace
Great battery life with hardware offload
Apps can extend formats and codecs
Multimedia platform
Media Foundation
Playback & preview
(IMFMediaEngine)
Windows Store app
Camera & mic capture
(IMFCaptureEngine)
Streaming to Xbox
(IMFMediaSharingEngine)
Transcode & trim
(IMFTranscodeEngine)
Audio/video reader (source)
Video
decoder
effect 1
encoder
effect n
Audio/video writer or render (sink)
Audio
HTML5 video & audio tags,
XAML MediaElement
Windows Runtime (WinRT)

5. A recap of video and audio
Content protection, e.g. PlayReady
Background audio
Stream to Xbox, TVs and audio receivers
Convert between popular formats
Low latency mode for communications and games
Video stabilization
Zoom and mirror modes
Stereo 3D
And more

6. What’s new Improved quality, performance & battery
Adaptive bitrate and encrypted streaming with HTML5 standards
Improved online playlists and ad insertion in connected standby
Custom formats without native code

7. What’s new Unconstrained download of large files
App discovery and launching on Xbox One
Audio effect management
Edit media file metadata in local libraries
And more

8. Completing your audio experience
Demo

9. Simple background audio playlist
Build 2012
4/20/2017
Simple background audio playlist
// Create audio element that continues to play in the background <audio id=“audioplayer" msAudioCategory=“BackgroundCapableMedia” autoplay /> // First track is from local library, then 2nd is chosen by the app var picker = new Windows.Storage.FileOpenPicker(); picker.pickSingleFileAsync(). then(function(file) { var url = URL.createObjectURL(file); document.getElementById(“audioplayer”).src = url; }); audio.addEventListener("ended", function() { document.getElementById(“audioplayer”).src = " }); /* If the device idles to connected standby, track2 can’t be fetched */
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. Set audio behavior using msAudioCategory
Set attribute for best experience when app is not visible and when audio is mixed
ForegroundOnlyMedia
BackgroundCapableMedia
Communications
Alert
SoundEffects
GameEffects
GameMedia
Other

11. Audio playlist while in connected standby
// Create downloader and download instance for a given URI to download to “newFile” var nextItem = " var downloader = new Windows.Networking.BackgroundTransfer.BackgroundDownloader(); var download = downloader.createDownload(nextItem, newFile); // Set priority so the download starts immediately download.priority = Windows.Networking.BackgroundTransfer.BackgroundTransferPriority.high; download.startAsync(); // Play the resulting file var url = URL.createObjectURL(newFile); document.getElementById(“audioplayer”).src = url;

12. Media playback controls
function initSystemMediaControls() { /* initialize at app activation */ SystemMediaControls = Windows.Media.SystemMediaTransportControls.getForCurrentView(); SystemMediaControls. /* Events for both software and hardware buttons */ addEventListener(“buttonpressed”, systemMediaControlsButtonPressed, false); SystemMediaControls.isPlayEnabled = true; /* Enable all buttons */ SystemMediaControls.isPauseEnabled = true; // Reflect the current playback state in the system UI SystemMediaControls.playbackStatus = Windows.Media.MediaPlaybackStatus.closed; }

13. Media playback controls
function systemMediaControlsButtonPressed(e) { var mediaButton = Windows.Media.SystemMediaTransportControlsButton; switch (e.button) { /* Add case statements for case mediaButton.play: audio.play(); break; /* each button */ case mediaButton.pause: audio.pause(); break; } function updateSystemMediaTransportControlsMetadata() { displayUpdater.type = Windows.Media.MediaPlaybackType.music; musicProperties.title = “my track title”; /* Add other metadata too */ displayUpdater.update();

15. Stream to, and remotely control Xbox
Build 2012
4/20/2017
Stream to, and remotely control Xbox
// Step 1: Obtain PlayToManager object for app’s current view var ptm = Windows.Media.PlayToManager.getForCurrentView(); // Step 2: Register for the “sourcerequested” event (when user selects Devices charm) ptm.addEventListener(“sourcerequested”, function(e) { var request = e.sourceRequest; var deferral = request.getDeferral(); // Step 3: Specify the media to be streamed request.setSource(document.getElementById(“audioplayer”).msPlayToSource); deferral.complete(); // The media will then be streamed to the device chosen by the user in the Charm. });
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

16. What’s new for the Devices charm
Clarity on what devices are supported: Play, Print, Project
Add a device from the charm
Adobe Flash video and audio now works from the browser
Audio from a video can be streamed to audio-only receivers (e.g. music videos)

17. Add a custom file or stream format
App is responsible for retrieving audio samples and parsing file format
MediaStreamSource takes elementary stream samples as input
Decoding and rendering by platform
Multimedia platform
Media Foundation
Playback & preview
(IMFMediaEngine)
Windows Store app
Camera & mic capture
(IMFCaptureEngine)
Streaming to Xbox
(IMFMediaSharingEngine)
Transcode & trim
(IMFTranscodeEngine)
Video
decoder
effect 1
encoder
effect n
Audio/video writer (sink)
Audio
HTML5 video & audio tags
XAML MediaElement
Windows Runtime (WinRT)
Media Stream Source
Get audio samples (e.g. sockets) and parse file format
Windows.Media.Core.MediaStreamSource
Audio/video reader (source)

18. Add a custom file or stream format
// Audio sample details and encoding properties: // Raw AAC data, 48KHz sampling rate, 2 channel and approx 124Kbps var sampleSize = 1024; var sampleDuration = 20; var audioProps = Windows.Media.MediaProperties.AudioEncodingProperties. createAac(48000, 2, ); // Create the media source with specific encoding properties. var streamSource = new Windows.Media.Core.MediaStreamSource(new Windows.Media.Core.AudioStreamDescriptor(audioProps));

19. Add a custom file or stream format
// Register handlers streamSource.addEventListener(“samplerequested”, sampleRequestedHandler, false); streamSource.canSeek = true; streamSource.musicProperties.title = “My track title”; var songDuration = 60000; // Attach media source to the audio tag and start playing var audio = document.getElementById(“audiotag”); audio.src = URL.createObjectURL(streamSource); audio.play();

20. Add a custom file or stream format
Build 2012
4/20/2017
Add a custom file or stream format
function sampleRequestedHandler(e) { var request = e.request; if (!MyCustomFormatParser.IsAtEndOfStream(randomAccessStream)) { var deferral = request.getDeferral(); var inputStream = MyCustomFormatParser.getInputStream(randomAccessStream); MediaStreamSample.createFromStreamAsync(inputStream, sampleSize, timeOffset). then(function(sample) { sample.duration = sampleDuration; /* When sample is requested, your */ sample.keyFrame = true; /* custom parser extracts audio data */ request.sample = sample; /* from RandomAccessStream and returns */ deferral.complete(); /* an InputStream of only audio samples */ }); }
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

21. Build 2012
4/20/2017
In review
Add audio declaration in app manifest and set msAudioCategory attribute
Handle media button events for play and pause at minimum
Set high priority on background downloader for online playlists
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

22. In review PlayTo app contract for streaming to Xbox
Build 2012
4/20/2017
In review
PlayTo app contract for streaming to Xbox
Use MediaStreamSource for advanced streaming or custom formats
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

23. Completing your video experience
Demo

24. Simple video playback, Windows 8.1
Build 2012
4/20/2017
Simple video playback, Windows 8.1
<MediaElement Name=“VideoPlayer” Source=“ PosterSource=“movie1_artwork.png” AreTransportControlsEnabled=“true” /> /* No longer necessary to create buttons and handlers for each. All transport control buttons, including Zoom and Fullscreen are free, as are power and performance optimizations */
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

25. Simple video playback, before 8.1
Build 2012
4/20/2017
Simple video playback, before 8.1
<MediaElement Name=“VideoPlayer” Source=“ PosterSource=“movie1_artwork.png” /> /* Before 8.1, Media playback buttons had to be manual. You can still do this for custom controls */ <StackPanel x:Name=“mtcPanel” Orientation=“Horizontal”> <Button Name=“btnPlay” Click=“btnPlay_Click” Content=“Play” /> <Button Name=“btnStop” Click=“btnStop_Click” Content=“Stop” /> <Button Name=“btnZoom” Click=“btnZoom_Click” Content=“Zoom” /> <Button Name=“btnFull” Click=“btnFull_Click” Content=“Full” /> </StackPanel>
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

26. Simple video playback, before 8.1
Build 2012
4/20/2017
Simple video playback, before 8.1
private DisplayRequest dispRequest = null; private void btnPlay_Click(object sender, RoutedEventArgs e) { VideoPlayer.Play(); /* Before 8.1, button handlers */ if (dispRequest == null) /* had to be manual, and a */ { /* display request had to be made */ dispRequest = new DisplayRequest(); /* to prevent the screen from */ dispRequest.RequestActive(); /* turning off after 2 minutes */ } private void btnStop_Click(object sender, RoutedEventArgs e) VideoPlayer.Stop(); if (dispRequest != null) { dispRequest.RequestRelease(); }
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

27. Full screen video, Windows 8.1
Build 2012
4/20/2017
Full screen video, Windows 8.1
/* Full screen is free using AreTransportControlsEnabled. This hides all UI and stretches to screen perfectly to ensure hardware offload */ <MediaElement Name=“VideoPlayer” Source=“ PosterSource=“movie1_artwork.png” AreTransportControlsEnabled=“true” /> /* For custom controls, let Windows optimize for hardware offload and set display request using the new IsFullWindow */ private void btnFull_Click(object sender, RoutedEventArgs e) { VideoPlayer.IsFullWindow = “true”; }
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

28. Video zoom for small screen tablets
Build 2012
4/20/2017
Video zoom for small screen tablets
/* Zoom is free using AreTransportControlsEnabled */ <MediaElement Name=“VideoPlayer” Source=“ PosterSource=“movie1_artwork.png” AreTransportControlsEnabled=“true” /> /* For custom controls, use Stretch */ private void btnZoom_Click(object sender, RoutedEventArgs e) { VideoPlayer.Stretch = “UniformToFill”; }
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

29. Media playback controls
Build 2012
4/20/2017
Media playback controls
private SystemMediaTransportControls SystemMediaControls = null; public void InitSystemMediaControls() { SystemMediaControls = SystemMediaTransportControls.getForCurrentView(); /* The new SystemMediaTransportControls events for software and hardware buttons */ SystemMediaControls.ButtonPressed += SystemMediaControls_ButtonPressed; /* Enable specific media playback buttons (for brevity, only play and pause are shown) */ SystemMediaControls.IsPlayEnabled = true; SystemMediaControls.IsPauseEnabled = true; /* Reflect the current playback state in the system UI */ SystemMediaControls.PlaybackStatus = MediaPlaybackStatus.Closed; }
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

30. Media playback controls
Build 2012
4/20/2017
Media playback controls
private async void SystemMediaControls_ButtonPressed(SystemMediaTransportControls sender, SystemMediaTransportControlsButtonPressedEventArgs args) { switch case SystemMediaTransportControlsButton.Play: /* Add case statements for */ VideoPlayer.Play(); break; /* each button – both system UI */ } /* and hardware buttons will event the same */ } /* Sets metadata from properties in the passed StorageFile */ private async Task UpdateSystemMediaControlsDisplayAsync(StorageFile mediaFile) copyFromFileAsyncSuccessful = await SystemMediaControls.DisplayUpdater.CopyFromFileAsync(Music, mediaFile);
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

31. Mute or pause when app is not visible
Build 2012
4/20/2017
Mute or pause when app is not visible
<MediaElement Name=“VideoPlayer” Source=“ PosterSource=“movie1_artwork.png” AudioCategory=“ForegroundOnlyMedia” /> /* Audio will mute when app */ /* is not visible */ /* If pause is appropriate when the video is not in view, listen for sound level changes similar to listening for button presses */ SystemMediaTransportControls SystemMediaControls = SystemMediaTransportControls.getForCurrentView(); SystemMediaControls.PropertyChanged += SystemMediaControls_PropertyChanged;
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

32. Mute or pause when app is not visible
Build 2012
4/20/2017
Mute or pause when app is not visible
private async void SystemMediaControls_PropertyChanged(SystemMediaTransportControls sender, SystemMediaTransportControlsPropertyChangedEventArgs args) { if (args.Property == SystemMediaTransportControlsProperty.SoundLevel) if (sender.SoundLevel == SoundLevel.Muted) { /* SoundLevel will only report ‘Muted’ when the app is not visible */ VideoPlayer.Pause(); } else { /* If SoundLevel isn’t ‘Muted’ the app must be visible */ VideoPlayer.Play();
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

34. Unconstrained download
Build 2012
4/20/2017
Unconstrained download
StorageFile offlineMovie = /* path for saving downloaded file */; BackgroundDownloader downloader = new BackgroundTransfer.BackgroundDownloader(); var download = downloader.CreateDownload(new Windows.Foundation.Uri(“ offlineMovie); List<DownloadOperation> operations = new List<DownloadOperation>(); operations.Add(download); /* Add as many downloads as you like */ var result = await BackgroundDownloader.RequestUnconstrainedDownloadsAsync(operations); if (result.IsUnconstrained) { /* If user accepts prompt, downloads are unconstrained. If no; constrained */ } Download.StartAsync().AsTask( /* Implement progress indicator, etc. */ );
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

35. Stream to, and remotely control Xbox
/* Step 1: Obtain PlayToManager object for app’s current view */ PlayToManager ptm = PlayToManager.GetForCurrentView(); /* Step 2: Register for SourceRequested event (fires when Devices charm selected) */ ptm.SourceRequested += (PlayToManager sender, PlayToSourceRequestedEventArgs e) => { request = e.SourceRequest; PlayToSourceDeferral deferral = request.GetDeferral(); request.SetSource(VideoPlayer.PlayToSource); /* Step 3: Set source of media */ deferral.Complete(); } /* The media will then be streamed to the device chosen by the user */

36. Add a custom file or stream format
/* Audio sample details and encoding properties: Raw AAC data, 48KHz sampling rate, 2 channel and approx 124Kbps */ AudioEncodingProperties AudioProps = new MediaProperties.AudioEncodingProperties.CreateAac(48000, 2, ); /* Create the media source with specific encoding properties. */ MediaStreamSource StreamSource = new Windows.Media.Core.MediaStreamSource(new Windows.Media.Core.AudioStreamDescriptor(AudioProps));

37. Add a custom file or stream format
/* Handle events on the media source. Only SampleRequested is shown for brevity */ StreamSource.SampleRequested += StreamSource_SampleRequested; /* Set higher level properties */ StreamSource.canSeek = true; StreamSource.MusicProperties.title = “My track title”; TimeSpan songDuration = new TimeSpan( ); StreamSource.duration = SongDuration; /* Attach media source to XAML MediaElement and start playing */ AudioPlayer.SetMediaStreamSource(StreamSource); AudioPlayer.Play();

38. Add a custom file or stream format
Build 2012
4/20/2017
Add a custom file or stream format
async void StreamSource_SampleRequested(MediaStreamSource sender, MediaStreamSourceSampleRequestedEventArgs args) { /* Whenever a sample is requested, */ MediaStreamSourceSampleRequest request = args.Request; /* MyCustomFormatParser parses the */ if (!MyCustomFormatParser.IsAtEndOfStream(RandomAccessStream)) /* RandomAccessStream to retrieve only raw audio */ { /* data then returns it as an InputStream */ Windows.Media.Core.StartingRequestDeferral deferral = request.GetDeferral(); IInputStream InputStream = MyCustomFormatParser.GetInputStream(RandomAccessStream); MediaStreamSample Sample = await MediaStreamSample.CreateFromStreamAsync(InputStream, sampleSize, timeOffset); Sample.duration = SampleDuration; Sample.keyFrame = true; timeOffset.Ticks += SampleDuration.Ticks; Request.Sample = Sample; deferral.Complete(); }
© 2012 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

39. In review
AreTransportControlsEnabled for integrated controls and best performance
With custom controls, optimize for full screen using IsFullWindow
Handle media button events for play and pause at minimum

40. In review SoundLevelChanged events to pause when not visible
Unconstrained background downloader for large files
PlayTo app contract for streaming to Xbox
MediaStreamSource for advanced streaming and custom formats

41. Video performance Video is offloaded to GPU, even when not full screen
Best performance when full screen
Delay setting source URI until ready to play
If you control video encoding, match encoded resolution with device resolutions

42. Small screen tablets Follow touch target size guidelines
Support video zoom for letterbox removal
Consider playing full screen as default
Consider locking screen orientation to landscape when playing full screen

43. Your Windows 8.1 and Xbox One apps are better together
Demo

44. Better together with Xbox One
From the Devices charm, users see Xbox One if your console app is installed
Xbox Music and Video apps are first to implement
Both apps and sites, and for protected content
Transition is fast and continues at current position
Playback controls persist in app, lock screen, Kinect voice, game controller or SmartGlass
Controls work when other apps are being used
Best quality and battery life because streaming is direct from the web

45. Xbox One app manifest
<!-- Register ms-playtoapp protocol handler to enable app launching. Apps can register multiple protocol handlers --> <Extensions> <Extension Category=“windows.protocol” StartPage=“main.html”> <Protocol Name=“ms-playtoapp-myapp” /> </Extension> </Extensions>

46. Windows 8.1 app
/* Pass custom meta info used to initiate streaming from Xbox One app using x-ms-playToPreferredUri */ <video id=“player” src=“ x-ms-playToPreferredUri=“ms-playtoapp-myapp://media?id=12345” controls />

47. Xbox One app contract
ptreceiver = new Windows.Media.PlayTo.PlayToReceiver(); /* Receiver accepts commands */ ptreceiver.supportsVideo = true; /* from home network, and */ ptreceiver.friendlyName = “My Movies App”; /* advertises playback state */ // Subscribe to events on the PlayToReceiver so you know when to control the video tag ptreceiver.addEventListener("playrequested", playRequestedHandler, false); ptreceiver.addEventListener("sourcechangerequested", sourceChangeRequestedHandler, false); // Subscribe to events on the video tag so you can update playback state on home network videoplayer.addEventListener("playing“, playingStateHandler, false); // Advertise the receiver on the home network and start receiving playback commands ptreceiver.startAsync().then( /* notify of current volume level, etc. */ );

48. Xbox One app contract
function playRequestedHandler(e) { document.getElementById(“videoplayer”).play(); } function sourceChangeRequestedHandler(e) { /* Set the source based on whether a preferred URI if (e.stream) { /* is provided or not */ if (e.properties["System.ItemUrl"] != null && e.properties["System.ItemUrl"].indexOf("ms-playtoapp") > -1) { // Parse custom Uri to extract variables encoded to initiate streaming else { var blob = MSApp.createBlobFromRandomAccessStream(e.stream.contentType, e.stream); document.getElementById(“videoplayer").src = URL.createObjectURL(blob); } /* If x-ms-playToPreferredUri isn’t specified, just set source normally */ }

49. Xbox One app contract
/* Call associated notifying method to update the home network whenever the state of the video tag change, such as: volumechange, ratechange, loadedmetadata, durationchange, seeking, seeked, playing, pause, ended, error */ function playingStateHandler(e) { ptreceiver.notifyPlaying(); }

50. Related sessions 3-088: Building apps that use the camera
3-089: Building media streaming apps and sites without plug-ins using MPEG-DASH

51. Resources Designing great entertainment apps for Windows
Playing and previewing audio and video
Creating a media player app
Handling hardware media buttons

52. 4/20/ :58 PM
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© 2013 Microsoft Corporation. All rights reserved. Microsoft, Windows, and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.