virtual_display.bat

@echo off
setlocal enabledelayedexpansion

:: Windows batch script to create a virtual display on an Android device and use scrcpy to connect to it

:: Function to clean up the virtual display when the script is terminated
:cleanup
echo Cleaning up...
echo Removing the virtual display...
adb shell settings put global overlay_display_devices none
echo Virtual display removed.
goto :eof

:: Check if adb is available
where adb >nul 2>&1
if %ERRORLEVEL% neq 0 (
    echo Error: adb is not installed or not in PATH. Please install Android Debug Bridge.
    pause
    exit /b 1
)

:: Check if device is connected
adb devices | findstr "device$" >nul
if %ERRORLEVEL% neq 0 (
    echo Error: No Android device connected. Please connect a device and try again.
    pause
    exit /b 1
)

:: Function to get the list of display IDs and save them to a temporary file
:get_display_ids
echo Getting display IDs...
adb shell dumpsys display | findstr "mDisplayId=" > display_ids_temp.txt
exit /b 0

:: Get initial display IDs
call :get_display_ids
set "initial_displays=display_ids_temp.txt"

:: Create a virtual display on the Android device
echo Creating a virtual display...
adb shell settings put global overlay_display_devices 1920x1080/240

:: Wait for the new display to be recognized
echo Waiting for display to be created...
timeout /t 2 >nul

:: Get new display IDs
call :get_display_ids
set "new_displays=display_ids_temp.txt"

:: Find the new display ID
echo Finding the secondary display ID...
set "secondary_display_id="
for /f "tokens=1 delims==" %%a in ('adb shell dumpsys display ^| findstr "mDisplayId="') do (
    set "display_id=%%a"
    set "display_id=!display_id:mDisplayId=!"
    set "display_id=!display_id: =!"
    
    findstr "!display_id!" %initial_displays% >nul
    if !ERRORLEVEL! neq 0 (
        set "secondary_display_id=!display_id!"
    )
)

if not defined secondary_display_id (
    echo Failed to detect the new display ID.
    call :cleanup
    del display_ids_temp.txt
    pause
    exit /b 1
) else (
    echo Detected secondary display ID: !secondary_display_id!
)

:: Clean up temporary files
del display_ids_temp.txt

:: Check if scrcpy is available
where scrcpy >nul 2>&1
if %ERRORLEVEL% neq 0 (
    echo Error: scrcpy is not installed or not in PATH. Please install scrcpy.
    call :cleanup
    pause
    exit /b 1
)

:: Start scrcpy with the provided options and detected display ID
echo Starting scrcpy on the virtual display...
start "" scrcpy -b 24M --window-title="Pixel" --max-fps=60 --no-audio --display-id !secondary_display_id!

echo.
echo Virtual display is running. Close this window to terminate and clean up.
echo.

:: Wait for user to close the window
pause
:: The cleanup function will be called when the script exits
call :cleanup
exit /b 0