Androidで
スクリーン配信をする技術

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14. .FEJB1SPKFDUJPOͷεςοϓ .FEJB1SPKFDUJPO
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15. DSFBUF.FEJB1SPKFDUJPOҎ߱ͷεςοϓ DSFBUF7JSUVBM%JTQMBZ .FEJB$PEFD 35.1
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16. 4FDVSJUZ

17. 4FDVSJUZ 3&26&45@.&%*"@130+&$5*0/

18. UBSHFU4EL7FSTJPO
     "OESPJE
     <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="your.package.name"> <uses-permission android:name="android.permission.FOREGROUND_SERVICE"

    /> <!-- লུ --> </manifest>

19. UBSHFU4EL7FSTJPO
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     .FEJB1SPKFDUJPO͸'PSFHSPVOEͰผϓϩηεͰಈͨ͘Ίهड़ඞਢ <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="your.package.name"> <uses-permission

    android:name="android.permission.FOREGROUND_SERVICE" /> <!-- লུ --> </manifest>

20. 6TFDBTFT 4DSFFO4IPU -JWF
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21. .FEJB1SPKFDUJPO
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22. (FU
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23. DPNQBOJPO
    PCKFDU companion object { private const val REQUEST_CAPTURE = 1

    private var projection: (MediaProjection?) -> Unit = {} val run: (context: Context, (MediaProjection?) -> Unit) -> Unit = { context, callback -> projection = callback context.startActivity(Intent(context, MediaProjectionModel::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_T ASK)) } }

24. HFU4ZTUFN4FSWJDF class MediaProjectionModel : Activity() { private lateinit var mediaProjectionManager:

    MediaProjectionManager override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) mediaProjectionManager = getSystemService(Service.MEDIA_PROJECTION_SERVICE) as MediaProjectionManager startActivityForResult(mediaProjectionManager.createScreenCaptureIntent (), REQUEST_CAPTURE) }

25. TUBSU"DUJWJUZ'PS3FTVMU override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

    if (requestCode == REQUEST_CAPTURE && resultCode == RESULT_OK && data != null) { projection(mediaProjectionManager.getMediaProjection(resultCode , data)) } finish() }

26. "MMPX
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27. 7JSUVBM%JTQMBZ 

28. "OESPJE
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29. "OESPJE
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30. "OESPJE
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31. "OESPJE
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32. 4VSGBDF7JFX ௨ৗͷ7JFXΫϥεΛܧঝͨ͠Ϋϥε 6*εϨου͔Βಠཱͯ͠ॲཧͰ͖Δ (-4VSGBDF7JFXͰ0QFO(-Λ࢖ͬͨඳը΋Ͱ͖Δ

33. 7JSUVBM%JTQMBZ View

34. 7JSUVBM%JTQMBZ View VirtualDisplay Mirroring

35. 7JSUVBM%JTQMBZ VirtualDisplay 4VSGBDF7JFX *NBHF3FOEFS #JUNBQग़ྗ༻ͷ4VSGBDFʹίϐʔ͢Δ ผͷ4VSGBDF7JFXʹίϐʔ͢Δ

36. *NBHF3FOEFS fun setupVirtualDisplay(): ImageReader? { val width = (metrics.widthPixels *

    scale).toInt() val height = (metrics.heightPixels * scale).toInt() val reader = ImageReader.newInstance(width , height, PixelFormat.RGBA_8888, 2).also { it.setOnImageAvailableListener(this, null) } virtualDisplay = mediaProjection?.createVirtualDisplay( "Capturing Display", width, height, metrics.densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, reader!!.surface, null, null ) callback.changeState(StatesType.Running) return reader

37. *NBHF3FOEFS override fun onImageAvailable(reader: ImageReader) { reader.acquireLatestImage().use { img ->

    runCatching { heepPlane = img?.planes?.get(0) ?: return@use null val width = heepPlane.rowStride / heepPlane.pixelStride val height = (metrics.heightPixels * scale).toInt() heepBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888).apply { copyPixelsFromBuffer(heepPlane.buffer) } callback.changeBitmap(heepBitmap) } } }

38. #JUNBQ
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39. 1JYFM'PSNBU 1JYFM'PSNBU3(#"@ 1JYFM'PSNBU3(#9@

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41. "MMPX
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42. .FEJB$PEFD 

43. .FEJB$PEFD .FEJB'PSNBUͰࢦఆ͞Εͨ΋ͷΛΤϯίʔυͨ͠Γ
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44. .FEJB'PSNBU val mime = MediaFormat.MIMETYPE_VIDEO_AVC val format = MediaFormat.createVideoFormat(mime, width,

    height) //ϑΥʔϚοτͷϓϩύςΟΛઃఆ //࠷௿ݶͷϓϩύςΟΛઃఆ͠ͳ͍ͱconfigureͰΤϥʔʹͳΔ format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface) format.setInteger(MediaFormat.KEY_FRAME_RATE, 30) // LolipopͰ͸͜͜͸ແࢹ͞ΕΔ format.setInteger(MediaFormat.KEY_BIT_RATE, 1000 * 1024) format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 10) format.setLong(MediaFormat.KEY_REPEAT_PREVIOUS_FRAME_AFTER, 1000000L / 30)

45. .FEJB'PSNBU ϓϩύςΟ આ໌ ,&:@$0-03@'03."5 ΧϥʔϑΥʔϚοτΛࢦఆ͠·͢ɻ4VSGBDFͷ৔߹͸ωΠςΟϒ3"8ϑΥʔ ϚοτͰ͋Δ
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    ϏοτϨʔτΛࢦఆ͠·͢ɻ.FEJB$PEFDͷ)Τϯίʔμʔ͸࢒೦ͳ ͕Βѹॖޮ཰͕Α͘ͳ͍ͨΊɺߴΊʹઃఆ͠ͳ͍ͱϒϩοΫ ϊΠζ͕ग़΍͢ ͍Ͱ͢ɻ ,&:@*@'3".&@*/5&37"- ΩʔϑϨʔϜ *ϑϨʔϜ ͷִؒΛઃఆ͠·͢ɻ௨ৗ͸ϑϨʔϜຖͰ͍͍ ͱࢥ͍·͕͢ɺΩʔϑϨʔϜִؒΛ୹͘͢Δͱ஗Ԇ͕গͳ͘ͳΓ·͢ɻ ,&:@3&1&"5@13&7*064@'3".&@"'5&3 4VSGBDFͰϑϨʔϜ͕͜ͳ͍৔߹ʹɺલͷϑϨʔϜΛ܁Γฦִؒ͢Λઃఆ͠ ·͢ɻ

46. .FEJB$PEFD$BMMCBDL codec = MediaCodec.createEncoderByType(mime) codec.setCallback(object: MediaCodec.Callback() { override fun onInputBufferAvailable(@NonNull

    codec: MediaCodec, index: Int) { Log.d("MediaCodec", "onInputBufferAvailable : " + codec.codecInfo) }

47. .FEJB$PEFD-JTU val codecName: String? = if (Build.VERSION_CODES.LOLLIPOP <= Build.VERSION.SDK_INT) {

    MediaCodecList(MediaCodecList.REGULAR_CODECS).findEncoderForFormat(mediaFormat) } else null return if (codecName != null) { MediaCodec.createByCodecName(codecName) } else { MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_AUDIO_AAC) }

48. .FEJB$PEFD$BMMCBDL override fun onOutputBufferAvailable(@NonNull codec: MediaCodec, index: Int, @NonNull info:

    MediaCodec.BufferInfo) { Log.d("MediaCodec", "onOutputBufferAvailable : $info") val buffer: ByteBuffer = codec.getOutputBuffer(index) val array = ByteArray(buffer.limit()) buffer.get(array) //Τϯίʔυ͞ΕͨσʔλΛૹ৴ Send(array) //όοϑΝΛղ์ codec.releaseOutputBuffer(index, false) }

49. .FEJB$PEFD$BMMCBDL override fun onError(@NonNull codec: MediaCodec, @NonNull e: CodecException) {

    Log.d("MediaCodec", "onError : " + e.message) } override fun onOutputFormatChanged(@NonNull codec: MediaCodec, @NonNull format: MediaFormat) { Log.d("MediaCodec", "onOutputFormatChanged : " + format.getString(MediaFormat.KEY_MIME)) } })

50. $POGJHVSF //ΤϯίʔμΛઃఆ codec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE) //ΤϯίʔμʹϑϨʔϜΛ౉͢ͷʹ࢖͏SurfaceΛऔಘ //configureͱstartͷؒͰݺͿඞཁ͋Γ inputSurface =

    codec.createInputSurface()

51. 7JSUVBM%JTQMBZ VirtualDisplay 4VSGBDF7JFX *NBHF3FOEFS #JUNBQग़ྗ༻ͷ4VSGBDFʹίϐʔ͢Δ ผͷ4VSGBDF7JFXʹίϐʔ͢Δ

52. 7JSUVBM%JTQMBZ fun setupVirtualDisplay(inputSurface: Surface) { val width = (metrics.widthPixels *

    scale).toInt() val height = (metrics.heightPixels * scale).toInt() virtualDisplay = mediaProjection?.createVirtualDisplay( "Capturing Display", width, height, metrics.densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, inputSurface, null, null ) callback.changeState(StatesType.Running) }

53. .FEJB$PEFD
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54. ө૾ϑΟϧλʔ 

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56. 7JSUVBM%JTQMBZ View VirtualDisplay Mirroring

57. 7JSUVBM%JTQMBZ View VirtualDisplay Mirroring Mirroring OpenGL ES (Shader)

58. (-4VSGBDF7JFX 4VSGBDF7JFXΑΓ΋ߴ଎ʹॲཧͰ͖Δ "OESPJEͰ͸&(-Λ࢖ͬͯ0QFO(-ͱϒϦοδ͍ͯ͠Δ 4IBEFSΛॻ͘͜ͱͰө૾ϑΟϧλʔΛ͚ͭΔ͜ͱ͕Ͱ͖Δ

59. (SBGJLB

60. (SBGJLB (PPHMF͕։ൃͨ͠άϥϑΟοΫε"1*ͷαϯϓϧू "QBDIF
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61. TFUVQ&(- fun setupEgl(surface: Surface) { eglCore = EglCore() windowSurface =

    WindowSurface(eglCore, surface, true).apply { makeCurrent() } defaultTexture2dProgram = DefaultTexture2dProgram( DefaultTexture2dProgram.TextureTarget.TextureExt ) blurTexture2dProgram = GaussianBlurTexture2dProgram( outputWidth = outputSize.width, outputHeight = outputSize.height ) texId = GlUtil.createTextureObject(GLES11Ext.GL_TEXTURE_EXTERNAL_OES)

62. TFUVQ&(- texId = GlUtil.createTextureObject(GLES11Ext.GL_TEXTURE_EXTERNAL_OES) GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR.toFloat()) GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR.toFloat())

    sprite2d = Sprite2d(Drawable2d(Drawable2d.Prefab.RECTANGLE)) .apply { setTexture(texId) setPosition(outputSize.width / 2f, outputSize.height / 2f) setScale(outputSize.width.toFloat(), outputSize.height.toFloat()) }

63. TFUVQ&(- sourceSurfaceTexture = SurfaceTexture(texId).apply { setDefaultBufferSize(renderConfig.width, renderConfig.height) setOnFrameAvailableListener { synchronized(hasRenderFrame)

    { hasRenderFrame = true } try { updateTexImage() } catch (e: Exception) { Timber.e(e, "failed to updateTexImage.") } } } sourceSurface = Surface(sourceSurfaceTexture) }

64. TFUVQ7JSUVBM%JTQMBZ fun setupVirtualDisplay() { virtualDisplay = mediaProjection.createVirtualDisplay( "screen_capture", renderConfig.width, renderConfig.height,

    renderConfig.dpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, sourceSurface, null, null ) }

65. ܨ͍͛ͯ͘ setupEgl(surface) setupVirtualDisplay() renderDisposable = Observable.interval( 0L, 1000L / renderConfig.frameRate,

    TimeUnit.MILLISECONDS ).observeOn(AndroidSchedulers.from(Looper.myLooper())) .subscribe({ drawFrame() }, { Timber.e("draw frame error") }) rotationChangeDetector.addListener(onRotationChange) notificationReceiveDetector.addListener(onNotificationReceive)

66. ϑϨʔϜ͕དྷͨΒESBX͢Δ private fun drawFrame() { synchronized(hasRenderFrame) { if (!hasRenderFrame) return

    hasRenderFrame = false } windowSurface.makeCurrent() GLES20.glViewport(0, 0, outputSize.width, outputSize.height) if (blurStatus.shouldBlur()) { sprite2d.draw(blurTexture2dProgram, tmpMatrix) } else { sprite2d.draw(defaultTexture2dProgram, tmpMatrix) } windowSurface.swapBuffers() }

67. ը໘ճస 

68. ը໘ͷճసΛݕ஌͢Δ override fun onReceive(context: Context, intent: Intent) { val windowManager

    = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager val angle = when (windowManager.defaultDisplay.rotation) { Surface.ROTATION_0 -> 0 Surface.ROTATION_90 -> 90 Surface.ROTATION_180 -> 180 Surface.ROTATION_270 -> 270 else -> throw IllegalArgumentException("unknown rotation.") } listeners.forEach { it(angle) } }

69. 0QFO(-ͰॎԣൺΛ߹ΘͤΔ private fun updateRotation(rotationAngle: Int) { val diffAngle = rotationAngle

    - renderConfig.rotationAngle val (w, h) = if (Math.abs(diffAngle) == 270 || Math.abs(diffAngle) == 90) { val scale = if (outputSize.width > outputSize.height) { outputSize.width.toFloat() / outputSize.height } else { outputSize.height.toFloat() / outputSize.width } Pair(outputSize.width * scale, outputSize.height * scale) } else { Pair(outputSize.width.toFloat(), outputSize.height.toFloat()) } sprite2d.setScale(w, h) sprite2d.setRotationZ(diffAngle.toFloat()) }

70. "VEJP1MBZCBDL$BQUVSF 

71. "VEJP1MBZCBDL$BQUVSF "OESPJE
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72. ྺ࢙ "OESPJE
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75. ੍໿ • DPNQJMF4EL7FSTJPO
    
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76. "VEJP1MBZCBDL$BQUVSF$POGJHVSBUJPO public boolean prepareInternalAudio(int bitrate, int sampleRate, boolean isStereo) {

    if (mediaProjection == null) { mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data); } AudioPlaybackCaptureConfiguration config = new AudioPlaybackCaptureConfiguration .Builder(mediaProjection) .addMatchingUsage(AudioAttributes.USAGE_MEDIA) .addMatchingUsage(AudioAttributes.USAGE_GAME) .addMatchingUsage(AudioAttributes.USAGE_UNKNOWN) .build(); microphoneManager.createInternalMicrophone(config, sampleRate, isStereo); prepareAudioRtp(isStereo, sampleRate); return audioEncoder.prepareAudioEncoder(bitrate, sampleRate, isStereo, microphoneManager.getMaxInputSize()); }

77. "VEJP1MBZCBDL$BQUVSF$POGJHVSBUJPO public void createInternalMicrophone(AudioPlaybackCaptureConfiguration config, int sampleRate, boolean isStereo) {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { this.sampleRate = sampleRate; if (!isStereo) channel = AudioFormat.CHANNEL_IN_MONO; audioRecord = new AudioRecord.Builder() .setAudioPlaybackCaptureConfig(config) .setAudioFormat(new AudioFormat.Builder() .setEncoding(audioFormat) .setSampleRate(sampleRate) .setChannelMask(channel) .build()) .setBufferSizeInBytes(getPcmBufferSize()) .build();

78. ·ͱΊ

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80. ँࣙ

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