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Use Steam VR-enabled applications with your phone as HMD (Head-mounted display). The only Open-Source solution to similar commercial packages like VRidge, Riftcat, Trinus etc etc.

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Contents

• Requirements
• Installation
• Advanced Configuration
• Development
• Troubleshooting
• Issues

Requirements

A PC with Windows 7 or above, A smartphone with Android 5.0(Lollipop) or above with OpenGL-ES 3.0 or above, Steam and some SteamVR applications installed.

Installation

• Make sure you have Steam and SteamVR installed (To find SteamVR on steam, Library -> Tools -> SteamVR).
• Download latest release PhoneVR.zip of this repository.
• Copy the whole folder PVRServer in driver folder of zip file into your SteamVR/drivers folder. (Default Path: C:\Program Files (x86)\Steam\steamapps\common\SteamVR\drivers.
• Install the Android Apk on your mobile from Releases page.
• Make sure that "Run in Background", "Auto Start"(Restart on Crash) permissions, if exists on your device(espicially Xiaomi users), are given. Also make sure that any kind of 3rd party battery saver app dosen't kill PhoneVR when in background.

To play, first open the Phone App(SteamVR should also be closed), then run the game of your choice on PC. (Obviously, both PC and Mobile should be on same Network, preferably Wifi 5.0)

Advanced Configuration

• Windows Driver Settings

  Windows SteamVR Driver, auto loads with SteamVR, and gets FrameTextures from VRApplication(like SteamVR Home, VRChat, etc.) via SteamVR. These Textures are then Encoded and Streamed, at specified game_fps, to Mobile device using x264 Encoder. Some configurations of this encoder can be adjusted via, pvrsettings.json in default installation location C:\Program Files (x86)\Steam\steamapps\common\SteamVR\drivers\PVRServer\.
  Default Settings :

  {
      "enable" : true,
      "game_fps" : 65,
      "video_stream_port" : 15243,
      "pose_stream_port" : 51423,
      "pairing_port" : 33333,
      "encoder" : {
          "preset" : "ultrafast",
          "tune" : "zerolatency",
          "qp" : 20,
          "profile" : "baseline"
      }
  }

  Most settings are self-explanatory. Any change in settings will require SteamVR to be restarted for application.

  • "encoder" : Encoder x264 Settings

    • "preset" : Can be set to "ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow" or "placebo" Warning: the speed of these presets scales dramatically. Ultrafast is a full 100 times faster than placebo! These presets affect the encoding speed. Using a slower preset gives you better compression, or quality per filesize, whereas faster presets give you worse compression. In general, you should just use the preset you can afford to wait for.

    • "tune" : Can be set to "film", "animation", "grain", "stillimage", "psnr", "ssim", "fastdecode", "zerolatency" Tune affects the video quality(and size), film being the best quality and gradually decreasing to the right

    • "profile" : Can be set to "baseline", "main", "high", "high10", "high422", "high444" Applies the restrictions of the given profile. Currently available profiles are specified above, from most to least restrictive. Does NOT guarantee that the given profile will be used: if the restrictions of "High" are applied to settings that are already Baseline-compatible, the stream will remain baseline. In short, it does not increase settings, only decrease them.

    • "qp" : Quantization packet constant, Range 0-51, 0-Lossless

    • "rc_method" : Rate Control Method, 1/2/3 Constant QP (CQP) - 0; Constant Rate factor (CRF) - 1; Average Bitrate (ABR) - 2; Default is 1 i.e., CRF with rf 24 (and rf_max 26)

    Other standard x264 settings,

    • "qcomp" : Default : 0
    • "keyint_max" : Default : -1
    • "intra_refresh" : Default : False
    • "bitrate" : Default : -1 (min 1000)

  Do only adjust when required, and keep a eye on pvrlog.txt file in default installation location C:\Program Files (x86)\Steam\steamapps\common\SteamVR\drivers\PVRServer\logs\ for "Skipped frame! Please re-tune the encoder parameters" messages. If you are getting these messages in excess, you may wish to downgrade settings since windows does not seems to have enough processing power and resources to render with existing settings.

Development

This Project is presently under testing. But, pull requests are welcome.

• Windows Driver: <root>/code/windows/PhoneVR.sln

  • Compiled/Tested on Microsoft Visual Studio 2017
  • After building copy the driver_PhoveVR.dll and other files from <solution root>/build/[win32 or x64]/ to local driver folder.
  • For Runtime debugging, You need to Attach MSVS JIT debugger to vrserver.exe (which actually loads the driver_PhonveVR.dll)
  • For testing, this project has 2 Build Configs, Debug and Release. Debug has lots of debugging callouts to both local-driver-folder/pvrlog.txt and MSVS Debugger Output.

• Android App: App folder: <root>/code/mobile/android/PhoneVR

  • Compiled/Tested on Android Studio 4.0.1
  • For testing, this project has 2 Build Configs, Debug and Release. Debug has lots of debugging callouts to logcat from both JAVA and JNI.

• External Vendor Libraries used (all Headers included in respective Projects):

  • Json v3.8.0 (https://github.com/nlohmann/json) (code\windows\libs\json)
  • Eigen v3.3.7 (https://gitlab.com/libeigen/eigen) (code\common\libs\eigen)
  • Asio v1.12.2 (https://sourceforge.net/projects/asio/files/asio/1.12.2%20%28Stable%29/) (code\common\libs\asio)
  • x264 0.161.r3015 MSVS15(2017) (https://github.com/ShiftMediaProject/x264)
  • GoogleVR 1.200 (https://github.com/googlevr/gvr-android-sdk) (code\mobile\android\libraries\jni)
  • ACRA v5.7 (https://github.com/ACRA/acra)

Troubleshooting

• Android App doesn’t connect to Windows Steam VR even after opening Phone App first and then SteamVR on windows

  1. Make sure that both the Windows and Android devices are in the same Local Network. (connected to the same router/wifi device)
  2. Sometimes, the port which PhoneVR use to connect win/mobile devices, also known as Pairing Port (default :33333), might be used by other services on your devices(Windows/Android). Try changing the "Pairing Port" on Android PhoneVR App settings and pairing_port in C:\Program Files\PhoneVR\pvrsettings.json for Windows PVR driver and restart SteamVR. Both Windows Pairing port and Android Pairing port should be the same. Safe recommended port range : 30000 - 65535

• Android App automatically comes back to "Discovery"(Home/AppStart) page after some VR Application usage

  • Check if Android System Battery saver or similar applications are killing the app when in background. Usually can be found is Android Setting -> Application Manager or Application Settings according to your Android device flavour/OEM.

• Lag while using VR App on mobile

  • Make sure you are not using debug variant of APK(unless you really want to).
  • All relevant component's FPS are displayed on Mobile device when Settings -> Debug is checked. You can find out what the bottleneck component in the whole chain from VRApplication on windows to GoogleVR SDK renderer on Android is and resolve it.

• Incase above mentioned things have not been helpful to you, then you might want to Install Debug variant of APK from [PhoneVR.zip]/android/arm7/debug which can help you/us to get more detailed logs.

• Diagnostics Stats Nomenclature (in order from VRAppFrameCreation to MobileFrameDisplay):
  These stats can be enabled by checking Settings->Stats option. All the values must be stable and more or less equal to game_fps± 10 value in pvrsettings.json.

  • --- @M - Mobile; @C - CPU/Desktop ---

    @FPS(s) :
    SR - StreamReceiver @M
    D - Media Decoder @M
    R - Frame Renderer @M
    
    cR - Frame Renderer @C
    SS - Stream Sender @C
    SW - Stream Writer @C
    E - Media Encoder @C
    VRa - VR Application FPS @C
    
    @Latency(s) :
    tSS - Time Delay between RendererGotFrame and RendererRendered @C
    tE - Time Delay between EncoderGotFrame and EncoderEncoded @C
    tND - NetworkDelay - Time Delay between DataPacketSent from @C to DataPacketReceived @M
    tSR - StreamReceiver - Time Delay between DataPacketSent from @C to DataSentToMediaDecoder @M

  

Issues

You can use the Github Issues or Discord to submit any issues related to working of this Project or for any query. For quick resolution you may want to add the following data along with your issue,

• steamvr.vrsettings file in default location C:\Program Files (x86)\Steam\config\steamvr.vrsettings
• vrserver.txt file in default location C:\Program Files (x86)\Steam\logs\vrserver.txt
• pvrLog.txt and/or pvrDebugLog.txt file(s) in default windows location C:\Program Files (x86)\Steam\steamapps\common\SteamVR\drivers\PVRServer\logs
• pvrLog.txt and/or pvrDebugLog.txt file(s) in default android location .../Android/data/virtualis.phonevr/files/PVR/ and/or Log from your Settings page on the app.
• Open a cmd in the follow default directory and copy paste output of the vrcmd command. C:\Program Files (x86)\Steam\steamapps\common\SteamVR\bin\win64\vrcmd.exe
• And ofcourse, how to reproduce the issue :)