Video recording

app/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.1)
+cmake_minimum_required(VERSION 3.10)
 
 add_library(
         gocryptfs
@@ -23,6 +23,56 @@ target_link_libraries(
         gocryptfs
 )
 
-include_directories(
+add_library(
-        ${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/
+        avformat
+        STATIC
+        IMPORTED
 )
+
+set_target_properties(
+        avformat
+        PROPERTIES IMPORTED_LOCATION
+        ${PROJECT_SOURCE_DIR}/ffmpeg/build/${ANDROID_ABI}/libavformat/libavformat.a
+)
+
+add_library(
+        avcodec
+        STATIC
+        IMPORTED
+)
+
+set_target_properties(
+        avcodec
+        PROPERTIES IMPORTED_LOCATION
+        ${PROJECT_SOURCE_DIR}/ffmpeg/build/${ANDROID_ABI}/libavcodec/libavcodec.a
+)
+
+add_library(
+        avutil
+        STATIC
+        IMPORTED
+)
+
+set_target_properties(
+        avutil
+        PROPERTIES IMPORTED_LOCATION
+        ${PROJECT_SOURCE_DIR}/ffmpeg/build/${ANDROID_ABI}/libavutil/libavutil.a
+)
+
+add_library(
+        mux
+        SHARED
+        src/main/native/libmux.c
+)
+
+target_link_libraries(
+        mux
+        avformat
+        avcodec
+        avutil
+)
+
+include_directories(
+        ${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}
+        ${PROJECT_SOURCE_DIR}/ffmpeg/build/${ANDROID_ABI}
+)

app/build.gradle

@@ -2,8 +2,8 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
-    buildToolsVersion "30.0.3"
+    buildToolsVersion "31"
     ndkVersion "21.4.7075529"
 
     compileOptions {
@@ -57,7 +57,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation "androidx.core:core-ktx:1.6.0"
     implementation "androidx.appcompat:appcompat:1.3.1"
-    implementation "androidx.constraintlayout:constraintlayout:2.1.0"
+    implementation "androidx.constraintlayout:constraintlayout:2.1.1"
 
     implementation "androidx.sqlite:sqlite-ktx:2.1.0"
     implementation "androidx.preference:preference-ktx:1.1.1"
@@ -66,14 +66,16 @@ dependencies {
     implementation "com.github.bumptech.glide:glide:4.12.0"
     implementation "androidx.biometric:biometric:1.1.0"
 
-    def exoplayer_version = "2.15.0"
+    def exoplayer_version = "2.15.1"
     implementation "com.google.android.exoplayer:exoplayer-core:$exoplayer_version"
     implementation "com.google.android.exoplayer:exoplayer-ui:$exoplayer_version"
 
-    def camerax_v1 = "1.1.0-alpha08"
+    implementation "androidx.concurrent:concurrent-futures:1.1.0"
+
+    def camerax_v1 = "1.1.0-alpha09"
     implementation "androidx.camera:camera-camera2:$camerax_v1"
     implementation "androidx.camera:camera-lifecycle:$camerax_v1"
-    def camerax_v2 = "1.0.0-alpha28"
+    def camerax_v2 = "1.0.0-alpha29"
     implementation "androidx.camera:camera-view:$camerax_v2"
     implementation "androidx.camera:camera-extensions:$camerax_v2"
 }

app/ffmpeg/.gitignore

@@ -0,0 +1,2 @@
+ffmpeg
+build

app/ffmpeg/build.sh

@@ -0,0 +1,81 @@
+#!/bin/bash
+
+if [ -z ${ANDROID_NDK_HOME+x} ]; then
+	echo "Error: \$ANDROID_NDK_HOME is not defined."
+else
+	compile_for_arch() {
+		case $1 in
+			"x86_64")
+				CFN="x86_64-linux-android21-clang"
+				ARCH="x86_64"
+				;;
+			"x86")
+				CFN="i686-linux-android21-clang"
+				ARCH="i686"
+				;;
+			"arm64-v8a")
+				CFN="aarch64-linux-android21-clang"
+				ARCH="aarch64"
+				;;
+			"armeabi-v7a")
+				CFN="armv7a-linux-androideabi19-clang"
+				ARCH="arm"
+				;;
+		esac
+		cd ffmpeg && make clean &&
+		./configure \
+			--cc="$CFN" \
+			--cxx="$CFN++" \
+			--arch="$ARCH" \
+			--target-os=android \
+			--enable-cross-compile \
+			--enable-version3 \
+			--disable-programs \
+			--disable-bsfs \
+			--disable-parsers \
+			--disable-demuxers \
+			--disable-decoders \
+			--disable-avdevice \
+			--disable-swresample \
+			--disable-swscale \
+			--disable-postproc \
+			--disable-avfilter \
+			--disable-network \
+			--disable-doc \
+			--disable-htmlpages \
+			--disable-manpages \
+			--disable-podpages \
+			--disable-txtpages \
+			--disable-sndio \
+			--disable-schannel \
+			--disable-securetransport \
+			--disable-xlib \
+			--disable-zlib \
+			--disable-cuvid \
+			--disable-nvenc \
+			--disable-vdpau \
+			--disable-videotoolbox \
+			--disable-audiotoolbox \
+			--disable-appkit \
+			--disable-alsa \
+			--disable-debug \
+			>/dev/null &&
+			make -j 8 >/dev/null &&
+			mkdir -p ../build/$1/libavformat ../build/$1/libavcodec ../build/$1/libavutil &&
+			cp libavformat/*.h libavformat/libavformat.a ../build/$1/libavformat &&
+			cp libavcodec/*.h libavcodec/libavcodec.a ../build/$1/libavcodec &&
+			cp libavutil/*.h libavutil/libavutil.a ../build/$1/libavutil &&
+			cd ..
+	}
+
+	export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
+	if [ "$#" -eq 1 ]; then
+		compile_for_arch $1
+	else
+		declare -a ABIs=("x86_64" "x86" "arm64-v8a" "armeabi-v7a")
+		for abi in ${ABIs[@]}; do
+			echo "Compiling for $abi..."
+			compile_for_arch $abi
+		done
+	fi
+fi

app/src/main/AndroidManifest.xml

@@ -11,6 +11,7 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
     <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
 
     <uses-feature
         android:name="android.hardware.camera.any"

app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt

@@ -1,6 +1,7 @@
 package sushi.hardcore.droidfs
 
 import android.Manifest
+import android.annotation.SuppressLint
 import android.content.Context
 import android.content.pm.PackageManager
 import android.hardware.camera2.CameraCharacteristics
@@ -20,26 +21,31 @@ import android.widget.EditText
 import android.widget.ImageView
 import android.widget.RelativeLayout
 import android.widget.Toast
+import androidx.annotation.RequiresApi
 import androidx.camera.camera2.interop.Camera2CameraInfo
 import androidx.camera.core.*
+//import androidx.camera.core.VideoCapture
 import androidx.camera.extensions.ExtensionMode
 import androidx.camera.extensions.ExtensionsManager
 import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import sushi.hardcore.droidfs.adapters.DialogSingleChoiceAdapter
 import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.databinding.ActivityCameraBinding
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.video_recording.SeekableWriter
+import sushi.hardcore.droidfs.video_recording.VideoCapture
 import sushi.hardcore.droidfs.widgets.ColoredAlertDialogBuilder
-import java.io.ByteArrayInputStream
+import java.io.*
-import java.io.ByteArrayOutputStream
 import java.text.SimpleDateFormat
 import java.util.*
 import java.util.concurrent.Executor
 
 class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     companion object {
-        private const val CAMERA_PERMISSION_REQUEST_CODE = 1
+        private const val CAMERA_PERMISSION_REQUEST_CODE = 0
+        private const val AUDIO_PERMISSION_REQUEST_CODE = 1
         private const val fileNameRandomMin = 100000
         private const val fileNameRandomMax = 999999
         private val dateFormat = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US)
@@ -61,19 +67,23 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     private lateinit var orientedIcons: List<ImageView>
     private lateinit var gocryptfsVolume: GocryptfsVolume
     private lateinit var outputDirectory: String
-    private lateinit var fileName: String
     private var isFinishingIntentionally = false
+    private var isAskingPermissions = false
     private var permissionsGranted = false
     private lateinit var executor: Executor
     private lateinit var cameraProvider: ProcessCameraProvider
     private lateinit var extensionsManager: ExtensionsManager
+    private lateinit var cameraSelector: CameraSelector
     private val cameraPreview = Preview.Builder().build()
     private var imageCapture: ImageCapture? = null
+    private var videoCapture: VideoCapture? = null
     private var camera: Camera? = null
     private var resolutions: List<Size>? = null
     private var currentResolutionIndex: Int = 0
     private var captureMode = ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
     private var isBackCamera = true
+    private var isInVideoMode = false
+    private var isRecording = false
     private lateinit var binding: ActivityCameraBinding
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -88,6 +98,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
             if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED){
                 permissionsGranted = true
             } else {
+                isAskingPermissions = true
                 requestPermissions(arrayOf(Manifest.permission.CAMERA), CAMERA_PERMISSION_REQUEST_CODE)
             }
         } else {
@@ -174,10 +185,6 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
             dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
             dialog.show()
         }
-        binding.imageClose.setOnClickListener {
-            isFinishingIntentionally = true
-            finish()
-        }
         binding.imageFlash.setOnClickListener {
             binding.imageFlash.setImageResource(when (imageCapture?.flashMode) {
                 ImageCapture.FLASH_MODE_AUTO -> {
@@ -194,6 +201,22 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 }
             })
         }
+        binding.imageModeSwitch.setOnClickListener {
+            isInVideoMode = !isInVideoMode
+            if (isInVideoMode) {
+                binding.recordVideoButton.visibility = View.VISIBLE
+                binding.takePhotoButton.visibility = View.GONE
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
+                        isAskingPermissions = true
+                        requestPermissions(arrayOf(Manifest.permission.RECORD_AUDIO), AUDIO_PERMISSION_REQUEST_CODE)
+                    }
+                }
+            } else {
+                binding.recordVideoButton.visibility = View.GONE
+                binding.takePhotoButton.visibility = View.VISIBLE
+            }
+        }
         binding.imageCameraSwitch.setOnClickListener {
             isBackCamera = if (isBackCamera) {
                 binding.imageCameraSwitch.setImageResource(R.drawable.icon_camera_back)
@@ -205,7 +228,8 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
             setupCamera()
         }
         binding.takePhotoButton.onClick = ::onClickTakePhoto
-        orientedIcons = listOf(binding.imageRatio, binding.imageTimer, binding.imageClose, binding.imageFlash, binding.imageCameraSwitch)
+        binding.recordVideoButton.setOnClickListener { onClickRecordVideo() }
+        orientedIcons = listOf(binding.imageRatio, binding.imageTimer, binding.imageCaptureMode, binding.imageFlash, binding.imageModeSwitch, binding.imageCameraSwitch)
         sensorOrientationListener = SensorOrientationListener(this)
 
         val scaleGestureDetector = ScaleGestureDetector(this, object : ScaleGestureDetector.SimpleOnScaleGestureListener(){
@@ -232,11 +256,13 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
     }
 
+    @RequiresApi(Build.VERSION_CODES.M)
     override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
         super.onRequestPermissionsResult(requestCode, permissions, grantResults)
-        when (requestCode) {
+        isAskingPermissions = false
-            CAMERA_PERMISSION_REQUEST_CODE -> if (grantResults.size == 1) {
+        if (grantResults.size == 1) {
-                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+            when (requestCode) {
+                CAMERA_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     permissionsGranted = true
                     setupCamera()
                 } else {
@@ -249,6 +275,12 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                             finish()
                         }.show()
                 }
+                AUDIO_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    if (videoCapture != null) {
+                        cameraProvider.unbind(videoCapture)
+                        camera = cameraProvider.bindToLifecycle(this, cameraSelector, videoCapture)
+                    }
+                }
             }
         }
     }
@@ -266,6 +298,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         (binding.cameraPreview.layoutParams as RelativeLayout.LayoutParams).addRule(RelativeLayout.CENTER_IN_PARENT)
     }
 
+    @SuppressLint("RestrictedApi")
     private fun setupCamera(resolution: Size? = null){
         if (permissionsGranted && ::extensionsManager.isInitialized && ::cameraProvider.isInitialized) {
             imageCapture = ImageCapture.Builder()
@@ -278,13 +311,19 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 }
                 .build()
 
-            var cameraSelector = if (isBackCamera){ CameraSelector.DEFAULT_BACK_CAMERA } else { CameraSelector.DEFAULT_FRONT_CAMERA }
+            videoCapture = VideoCapture.Builder().apply {
+                resolution?.let {
+                    setTargetResolution(it)
+                }
+            }.build()
+
+            cameraSelector = if (isBackCamera){ CameraSelector.DEFAULT_BACK_CAMERA } else { CameraSelector.DEFAULT_FRONT_CAMERA }
             if (extensionsManager.isExtensionAvailable(cameraProvider, cameraSelector, ExtensionMode.HDR)) {
                 cameraSelector = extensionsManager.getExtensionEnabledCameraSelector(cameraProvider, cameraSelector, ExtensionMode.HDR)
             }
 
             cameraProvider.unbindAll()
-            camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, imageCapture)
+            camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, imageCapture, videoCapture)
 
             adaptPreviewSize(resolution ?: imageCapture!!.attachedSurfaceResolution!!.swap())
 
@@ -299,15 +338,15 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
     }
 
-    private fun takePhoto() {
+    private fun takePhoto(outputPath: String) {
         val imageCapture = imageCapture ?: return
         val outputBuff = ByteArrayOutputStream()
         val outputOptions = ImageCapture.OutputFileOptions.Builder(outputBuff).build()
         imageCapture.takePicture(outputOptions, executor, object : ImageCapture.OnImageSavedCallback {
             override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
                 binding.takePhotoButton.onPhotoTaken()
-                if (gocryptfsVolume.importFile(ByteArrayInputStream(outputBuff.toByteArray()), PathUtils.pathJoin(outputDirectory, fileName))){
+                if (gocryptfsVolume.importFile(ByteArrayInputStream(outputBuff.toByteArray()), outputPath)){
-                    Toast.makeText(applicationContext, getString(R.string.picture_save_success, fileName), Toast.LENGTH_SHORT).show()
+                    Toast.makeText(applicationContext, getString(R.string.picture_save_success, outputPath), Toast.LENGTH_SHORT).show()
                 } else {
                     ColoredAlertDialogBuilder(this@CameraActivity)
                         .setTitle(R.string.error)
@@ -327,11 +366,17 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         })
     }
 
-    private fun onClickTakePhoto() {
+    private fun getOutputPath(isVideo: Boolean): String {
-        val baseName = "IMG_"+dateFormat.format(Date())+"_"
+        val baseName = if (isVideo) {"VID"} else {"IMG"}+'_'+dateFormat.format(Date())+'_'
+        var fileName: String
         do {
-            fileName = baseName+(random.nextInt(fileNameRandomMax-fileNameRandomMin)+fileNameRandomMin)+".jpg"
+            fileName = baseName+(random.nextInt(fileNameRandomMax-fileNameRandomMin)+fileNameRandomMin)+'.'+ if (isVideo) {"mp4"} else {"jpg"}
         } while (gocryptfsVolume.pathExists(fileName))
+        return PathUtils.pathJoin(outputDirectory, fileName)
+    }
+
+    private fun onClickTakePhoto() {
+        val path = getOutputPath(false)
         if (timerDuration > 0){
             binding.textTimer.visibility = View.VISIBLE
             Thread{
@@ -340,12 +385,47 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                     Thread.sleep(1000)
                 }
                 runOnUiThread {
-                    takePhoto()
+                    takePhoto(path)
                     binding.textTimer.visibility = View.GONE
                 }
             }.start()
         } else {
-            takePhoto()
+            takePhoto(path)
+        }
+    }
+
+    @SuppressLint("MissingPermission")
+    private fun onClickRecordVideo() {
+        isRecording = if (isRecording) {
+            videoCapture?.stopRecording()
+            false
+        } else {
+            val path = getOutputPath(true)
+            val handleId = gocryptfsVolume.openWriteMode(path)
+            videoCapture?.startRecording(VideoCapture.OutputFileOptions(object : SeekableWriter {
+                var offset = 0L
+                override fun write(byteArray: ByteArray) {
+                    offset += gocryptfsVolume.writeFile(handleId, offset, byteArray, byteArray.size)
+                }
+                override fun seek(offset: Long) {
+                    this.offset = offset
+                }
+                override fun close() {
+                    gocryptfsVolume.closeFile(handleId)
+                }
+            }), executor, object : VideoCapture.OnVideoSavedCallback {
+                override fun onVideoSaved() {
+                    Toast.makeText(applicationContext, getString(R.string.video_save_success, path), Toast.LENGTH_SHORT).show()
+                    binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
+                }
+                override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
+                    Toast.makeText(applicationContext, message, Toast.LENGTH_SHORT).show()
+                    cause?.printStackTrace()
+                    binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
+                }
+            })
+            binding.recordVideoButton.setImageResource(R.drawable.stop_recording_video_button)
+            true
         }
     }
 
@@ -367,10 +447,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     override fun onPause() {
         super.onPause()
         sensorOrientationListener.remove(this)
-        if (
+        if (!isAskingPermissions && !usf_keep_open) {
-                (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) //not asking for permission
-                && !usf_keep_open
-        ){
             finish()
         }
     }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt

@@ -171,7 +171,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                     listOf("importFolder", R.string.import_folder, R.drawable.icon_import_folder),
                     listOf("createFile", R.string.new_file, R.drawable.icon_file_unknown),
                     listOf("createFolder", R.string.mkdir, R.drawable.icon_create_new_folder),
-                    listOf("takePhoto", R.string.take_photo, R.drawable.icon_camera)
+                    listOf("camera", R.string.camera, R.drawable.icon_camera)
                 )
                 ColoredAlertDialogBuilder(this)
                     .setSingleChoiceItems(adapter, -1){ thisDialog, which ->
@@ -215,7 +215,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                             "createFolder" -> {
                                 openDialogCreateFolder()
                             }
-                            "takePhoto" -> {
+                            "camera" -> {
                                 val intent = Intent(this, CameraActivity::class.java)
                                 intent.putExtra("path", currentDirectoryPath)
                                 intent.putExtra("sessionID", gocryptfsVolume.sessionID)

app/src/main/java/sushi/hardcore/droidfs/video_recording/MediaMuxer.kt

@@ -0,0 +1,92 @@
+package sushi.hardcore.droidfs.video_recording
+
+import android.media.MediaCodec
+import android.media.MediaFormat
+import java.nio.ByteBuffer
+
+class MediaMuxer(val writer: SeekableWriter) {
+    external fun allocContext(): Long
+    external fun addVideoTrack(formatContext: Long, bitrate: Int, width: Int, height: Int): Int
+    external fun addAudioTrack(formatContext: Long, bitrate: Int, sampleRate: Int, channelCount: Int): Int
+    external fun writeHeaders(formatContext: Long): Int
+    external fun writePacket(formatContext: Long, buffer: ByteArray, pts: Long, streamIndex: Int, isKeyFrame: Boolean)
+    external fun writeTrailer(formatContext: Long)
+    external fun release(formatContext: Long)
+
+    companion object {
+        const val VIDEO_TRACK_INDEX = 0
+        const val AUDIO_TRACK_INDEX = 1
+    }
+
+    var formatContext: Long?
+
+    var realVideoTrackIndex: Int? = null
+    var audioFrameSize: Int? = null
+    var firstPts: Long? = null
+    private var audioPts = 0L
+
+    init {
+        System.loadLibrary("mux")
+        formatContext = allocContext()
+    }
+
+    fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo) {
+        val byteArray = ByteArray(bufferInfo.size)
+        buffer.get(byteArray)
+        if (firstPts == null) {
+            firstPts = bufferInfo.presentationTimeUs
+        }
+        if (trackIndex == AUDIO_TRACK_INDEX) {
+            writePacket(formatContext!!, byteArray, audioPts, -1, false)
+            audioPts += audioFrameSize!!
+        } else {
+            writePacket(
+                formatContext!!, byteArray, bufferInfo.presentationTimeUs - firstPts!!, realVideoTrackIndex!!,
+                bufferInfo.flags and MediaCodec.BUFFER_FLAG_KEY_FRAME != 0
+            )
+        }
+    }
+
+    fun addTrack(format: MediaFormat): Int {
+        val mime = format.getString("mime")!!.split('/')
+        val bitrate = format.getInteger("bitrate")
+        return if (mime[0] == "audio") {
+            audioFrameSize = addAudioTrack(
+                formatContext!!,
+                bitrate,
+                format.getInteger("sample-rate"),
+                format.getInteger("channel-count")
+            )
+            AUDIO_TRACK_INDEX
+        } else {
+            realVideoTrackIndex = addVideoTrack(
+                formatContext!!,
+                bitrate,
+                format.getInteger("width"),
+                format.getInteger("height")
+            )
+            VIDEO_TRACK_INDEX
+        }
+    }
+
+    fun start() {
+        writeHeaders(formatContext!!)
+    }
+    fun stop() {
+        writeTrailer(formatContext!!)
+    }
+    fun release() {
+        writer.close()
+        release(formatContext!!)
+        firstPts = null
+        audioPts = 0
+        formatContext = null
+    }
+
+    fun writePacket(buff: ByteArray) {
+        writer.write(buff)
+    }
+    fun seek(offset: Long) {
+        writer.seek(offset)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/video_recording/SeekableWriter.kt

@@ -0,0 +1,7 @@
+package sushi.hardcore.droidfs.video_recording
+
+interface SeekableWriter {
+    fun write(byteArray: ByteArray)
+    fun seek(offset: Long)
+    fun close()
+}

app/src/main/java/sushi/hardcore/droidfs/video_recording/VideoCaptureConfig.java

@@ -0,0 +1,212 @@
+package sushi.hardcore.droidfs.video_recording;
+
+import android.annotation.SuppressLint;
+
+import androidx.annotation.NonNull;
+import androidx.camera.core.impl.Config;
+import androidx.camera.core.impl.ImageFormatConstants;
+import androidx.camera.core.impl.ImageOutputConfig;
+import androidx.camera.core.impl.OptionsBundle;
+import androidx.camera.core.impl.UseCaseConfig;
+import androidx.camera.core.internal.ThreadConfig;
+
+/**
+ * Config for a video capture use case.
+ *
+ * <p>In the earlier stage, the VideoCapture is deprioritized.
+ */
+@SuppressLint("RestrictedApi")
+public final class VideoCaptureConfig
+        implements UseCaseConfig<VideoCapture>,
+        ImageOutputConfig,
+        ThreadConfig {
+
+    // Option Declarations:
+    // *********************************************************************************************
+
+    public static final Option<Integer> OPTION_VIDEO_FRAME_RATE =
+            Option.create("camerax.core.videoCapture.recordingFrameRate", int.class);
+    public static final Option<Integer> OPTION_BIT_RATE =
+            Option.create("camerax.core.videoCapture.bitRate", int.class);
+    public static final Option<Integer> OPTION_INTRA_FRAME_INTERVAL =
+            Option.create("camerax.core.videoCapture.intraFrameInterval", int.class);
+    public static final Option<Integer> OPTION_AUDIO_BIT_RATE =
+            Option.create("camerax.core.videoCapture.audioBitRate", int.class);
+    public static final Option<Integer> OPTION_AUDIO_SAMPLE_RATE =
+            Option.create("camerax.core.videoCapture.audioSampleRate", int.class);
+    public static final Option<Integer> OPTION_AUDIO_CHANNEL_COUNT =
+            Option.create("camerax.core.videoCapture.audioChannelCount", int.class);
+    public static final Option<Integer> OPTION_AUDIO_MIN_BUFFER_SIZE =
+            Option.create("camerax.core.videoCapture.audioMinBufferSize", int.class);
+
+    // *********************************************************************************************
+
+    private final OptionsBundle mConfig;
+
+    public VideoCaptureConfig(@NonNull OptionsBundle config) {
+        mConfig = config;
+    }
+
+    /**
+     * Returns the recording frames per second.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getVideoFrameRate(int valueIfMissing) {
+        return retrieveOption(OPTION_VIDEO_FRAME_RATE, valueIfMissing);
+    }
+
+    /**
+     * Returns the recording frames per second.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getVideoFrameRate() {
+        return retrieveOption(OPTION_VIDEO_FRAME_RATE);
+    }
+
+    /**
+     * Returns the encoding bit rate.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getBitRate(int valueIfMissing) {
+        return retrieveOption(OPTION_BIT_RATE, valueIfMissing);
+    }
+
+    /**
+     * Returns the encoding bit rate.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getBitRate() {
+        return retrieveOption(OPTION_BIT_RATE);
+    }
+
+    /**
+     * Returns the number of seconds between each key frame.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getIFrameInterval(int valueIfMissing) {
+        return retrieveOption(OPTION_INTRA_FRAME_INTERVAL, valueIfMissing);
+    }
+
+    /**
+     * Returns the number of seconds between each key frame.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getIFrameInterval() {
+        return retrieveOption(OPTION_INTRA_FRAME_INTERVAL);
+    }
+
+    /**
+     * Returns the audio encoding bit rate.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getAudioBitRate(int valueIfMissing) {
+        return retrieveOption(OPTION_AUDIO_BIT_RATE, valueIfMissing);
+    }
+
+    /**
+     * Returns the audio encoding bit rate.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getAudioBitRate() {
+        return retrieveOption(OPTION_AUDIO_BIT_RATE);
+    }
+
+    /**
+     * Returns the audio sample rate.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getAudioSampleRate(int valueIfMissing) {
+        return retrieveOption(OPTION_AUDIO_SAMPLE_RATE, valueIfMissing);
+    }
+
+    /**
+     * Returns the audio sample rate.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getAudioSampleRate() {
+        return retrieveOption(OPTION_AUDIO_SAMPLE_RATE);
+    }
+
+    /**
+     * Returns the audio channel count.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getAudioChannelCount(int valueIfMissing) {
+        return retrieveOption(OPTION_AUDIO_CHANNEL_COUNT, valueIfMissing);
+    }
+
+    /**
+     * Returns the audio channel count.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getAudioChannelCount() {
+        return retrieveOption(OPTION_AUDIO_CHANNEL_COUNT);
+    }
+
+    /**
+     * Returns the audio minimum buffer size, in bytes.
+     *
+     * @param valueIfMissing The value to return if this configuration option has not been set.
+     * @return The stored value or <code>valueIfMissing</code> if the value does not exist in this
+     * configuration.
+     */
+    public int getAudioMinBufferSize(int valueIfMissing) {
+        return retrieveOption(OPTION_AUDIO_MIN_BUFFER_SIZE, valueIfMissing);
+    }
+
+    /**
+     * Returns the audio minimum buffer size, in bytes.
+     *
+     * @return The stored value, if it exists in this configuration.
+     * @throws IllegalArgumentException if the option does not exist in this configuration.
+     */
+    public int getAudioMinBufferSize() {
+        return retrieveOption(OPTION_AUDIO_MIN_BUFFER_SIZE);
+    }
+
+    /**
+     * Retrieves the format of the image that is fed as input.
+     *
+     * <p>This should always be PRIVATE for VideoCapture.
+     */
+    @Override
+    public int getInputFormat() {
+        return ImageFormatConstants.INTERNAL_DEFINED_IMAGE_FORMAT_PRIVATE;
+    }
+
+    @NonNull
+    @Override
+    public Config getConfig() {
+        return mConfig;
+    }
+}

app/src/main/native/libmux.c

@@ -0,0 +1,125 @@
+#include <libavformat/avformat.h>
+#include <libavcodec/avcodec.h>
+#include <libavutil/channel_layout.h>
+#include <jni.h>
+
+const size_t BUFF_SIZE = 4096;
+
+struct Muxer {
+    JavaVM* jvm;
+    jobject thiz;
+    jmethodID write_packet_method_id;
+    jmethodID seek_method_id;
+};
+
+int write_packet(void* opaque, uint8_t* buff, int buff_size) {
+    struct Muxer* muxer = opaque;
+    JNIEnv *env;
+    (*muxer->jvm)->GetEnv(muxer->jvm, (void **) &env, JNI_VERSION_1_6);
+    jbyteArray jarray = (*env)->NewByteArray(env, buff_size);
+    (*env)->SetByteArrayRegion(env, jarray, 0, buff_size, buff);
+    (*env)->CallVoidMethod(env, muxer->thiz, muxer->write_packet_method_id, jarray, buff_size);
+    return buff_size;
+}
+
+int64_t seek(void* opaque, int64_t offset, int whence) {
+    struct Muxer* muxer = opaque;
+    JNIEnv *env;
+    (*muxer->jvm)->GetEnv(muxer->jvm, (void **) &env, JNI_VERSION_1_6);
+    (*env)->CallVoidMethod(env, muxer->thiz, muxer->seek_method_id, offset);
+    return offset;
+}
+
+jlong Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_allocContext(JNIEnv *env, jobject thiz) {
+    const AVOutputFormat *format = av_guess_format("mp4", NULL, NULL);
+    struct Muxer* muxer = malloc(sizeof(struct Muxer));
+    (*env)->GetJavaVM(env, &muxer->jvm);
+    muxer->thiz = (*env)->NewGlobalRef(env, thiz);
+    jclass class = (*env)->GetObjectClass(env, thiz);
+    muxer->write_packet_method_id = (*env)->GetMethodID(env, class, "writePacket", "([B)V");
+    muxer->seek_method_id = (*env)->GetMethodID(env, class, "seek", "(J)V");
+    AVIOContext* avio_context = avio_alloc_context(av_malloc(BUFF_SIZE), BUFF_SIZE, 1, muxer, NULL, write_packet, seek);
+    AVFormatContext* fc = avformat_alloc_context();
+    fc->oformat = format;
+    fc->pb = avio_context;
+    return (jlong) fc;
+}
+
+JNIEXPORT jint JNICALL
+Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_addAudioTrack(JNIEnv *env, jobject thiz, jlong format_context, jint bitrate, jint sample_rate,
+                                                     jint channel_count) {
+    const AVCodec* encoder = avcodec_find_encoder(AV_CODEC_ID_AAC);
+    AVStream* stream = avformat_new_stream((AVFormatContext *) format_context, NULL);
+    AVCodecContext* codec_context = avcodec_alloc_context3(encoder);
+    codec_context->channels = channel_count;
+    codec_context->channel_layout = av_get_default_channel_layout(channel_count);
+    codec_context->sample_rate = sample_rate;
+    codec_context->sample_fmt = encoder->sample_fmts[0];
+    codec_context->bit_rate = bitrate;
+    codec_context->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
+    stream->time_base.den = sample_rate;
+    stream->time_base.num = 1;
+    codec_context->flags = AV_CODEC_FLAG_GLOBAL_HEADER;
+    avcodec_open2(codec_context, encoder, NULL);
+    avcodec_parameters_from_context(stream->codecpar, codec_context);
+    int frame_size = codec_context->frame_size;
+    avcodec_free_context(&codec_context);
+    return frame_size;
+}
+
+JNIEXPORT jint JNICALL
+Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_addVideoTrack(JNIEnv *env, jobject thiz, jlong format_context, jint bitrate, jint width,
+                                                     jint height) {
+    AVStream* stream = avformat_new_stream((AVFormatContext *) format_context, NULL);
+    stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+    stream->codecpar->codec_id = AV_CODEC_ID_H264;
+    stream->codecpar->bit_rate = bitrate;
+    stream->codecpar->width = width;
+    stream->codecpar->height = height;
+    return stream->index;
+}
+
+JNIEXPORT jint JNICALL
+Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_writeHeaders(JNIEnv *env, jobject thiz, jlong format_context) {
+    return avformat_write_header((AVFormatContext *) format_context, NULL);
+}
+
+JNIEXPORT void JNICALL
+Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_writePacket(JNIEnv *env, jobject thiz, jlong format_context,
+                                                   jbyteArray buffer, jlong pts, jint stream_index,
+                                                   jboolean is_key_frame) {
+    AVPacket* packet = av_packet_alloc();
+    int size = (*env)->GetArrayLength(env, buffer);
+    av_new_packet(packet, size);
+    packet->pts = pts;
+    if (stream_index >= 0) { //video
+        packet->stream_index = stream_index;
+        AVRational r;
+        r.num = 1;
+        r.den = 1000000;
+        av_packet_rescale_ts(packet, r, ((AVFormatContext *)format_context)->streams[stream_index]->time_base);
+    }
+    unsigned char* buff = malloc(size);
+    (*env)->GetByteArrayRegion(env, buffer, 0, size, buff);
+    packet->data = buff;
+    if (is_key_frame) {
+        packet->flags = AV_PKT_FLAG_KEY;
+    }
+    av_write_frame((AVFormatContext *)format_context, packet);
+    free(buff);
+    av_packet_free(&packet);
+}
+
+JNIEXPORT void JNICALL
+Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_writeTrailer(JNIEnv *env, jobject thiz, jlong format_context) {
+    av_write_trailer((AVFormatContext *) format_context);
+}
+
+JNIEXPORT void JNICALL
+Java_sushi_hardcore_droidfs_video_1recording_MediaMuxer_release(JNIEnv *env, jobject thiz, jlong format_context) {
+    AVFormatContext* fc = (AVFormatContext *) format_context;
+    av_free(fc->pb->buffer);
+    free(fc->pb->opaque);
+    avio_context_free(&fc->pb);
+    avformat_free_context(fc);
+}

app/src/main/res/drawable/icon_video.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M17,10.5V7c0,-0.55 -0.45,-1 -1,-1H4c-0.55,0 -1,0.45 -1,1v10c0,0.55 0.45,1 1,1h12c0.55,0 1,-0.45 1,-1v-3.5l4,4v-11l-4,4z"/>
+</vector>

app/src/main/res/drawable/record_video_button.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true">
+        <shape android:shape="oval">
+            <solid android:color="#ff0000" />
+            <size android:width="75dp" android:height="75dp" />
+            <stroke android:width="15dp" android:color="#444444"/>
+        </shape>
+    </item>
+    <item>
+        <shape android:shape="oval">
+            <solid android:color="#ff0000"/>
+            <size android:width="75dp" android:height="75dp" />
+            <stroke android:width="8dp" android:color="#444444"/>
+        </shape>
+    </item>
+</selector>

app/src/main/res/drawable/stop_recording_video_button.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="#ff0000"/>
+            <size android:width="5dp" android:height="5dp" />
+            <stroke android:color="#00000000" android:width="45dp"/>
+        </shape>
+    </item>
+    <item>
+        <shape android:shape="oval">
+            <size android:width="75dp" android:height="75dp" />
+            <stroke android:width="8dp" android:color="#444444"/>
+        </shape>
+    </item>
+</layer-list>

app/src/main/res/layout/activity_camera.xml

@@ -4,7 +4,8 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    tools:context=".CameraActivity">
+    tools:context=".CameraActivity"
+    android:background="#000000">
 
     <androidx.camera.view.PreviewView
         android:id="@+id/camera_preview"
@@ -43,15 +44,15 @@
             android:layout_height="30dp"
             android:src="@drawable/icon_timer_off"
             app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintEnd_toStartOf="@id/image_close"
+            app:layout_constraintEnd_toStartOf="@id/image_flash"
             app:layout_constraintStart_toEndOf="@id/image_ratio"
             app:layout_constraintTop_toTopOf="parent" />
 
         <ImageView
-            android:id="@+id/image_close"
+            android:id="@+id/image_flash"
             android:layout_width="30dp"
             android:layout_height="30dp"
-            android:src="@drawable/icon_close"
+            android:src="@drawable/icon_flash_auto"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toEndOf="@id/image_timer"
@@ -74,27 +75,41 @@
         android:layout_marginBottom="30dp">
 
         <ImageView
-            android:id="@+id/image_flash"
+            android:id="@+id/image_mode_switch"
             android:layout_width="30dp"
             android:layout_height="30dp"
-            android:src="@drawable/icon_flash_auto"
+            android:src="@drawable/icon_video"
-            android:layout_alignEnd="@id/take_photo_button"
+            android:layout_alignEnd="@id/layout_record_buttons"
             android:layout_marginEnd="120dp"
             android:layout_centerVertical="true"/>
 
-        <sushi.hardcore.droidfs.widgets.TakePhotoButton
+        <RelativeLayout
-            android:id="@+id/take_photo_button"
+            android:id="@+id/layout_record_buttons"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:src="@drawable/take_photo_button"
+            android:layout_centerInParent="true">
-            android:layout_centerInParent="true"/>
+
+            <ImageView
+                android:id="@+id/record_video_button"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:src="@drawable/record_video_button"
+                android:visibility="gone"/>
+
+            <sushi.hardcore.droidfs.widgets.TakePhotoButton
+                android:id="@+id/take_photo_button"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:src="@drawable/take_photo_button"/>
+
+        </RelativeLayout>
 
         <ImageView
             android:id="@+id/image_camera_switch"
             android:layout_width="30dp"
             android:layout_height="30dp"
             android:src="@drawable/icon_camera_front"
-            android:layout_alignStart="@id/take_photo_button"
+            android:layout_alignStart="@id/layout_record_buttons"
             android:layout_marginStart="120dp"
             android:layout_centerVertical="true"/>
 

app/src/main/res/values-pt-rBR/strings.xml

@@ -144,7 +144,7 @@
     <string name="copy_failed">Falha ao copiar o %s .</string>
     <string name="copy_success">Cópia feita!</string>
     <string name="fab_dialog_title">Adicionar</string>
-    <string name="take_photo">Tirar foto</string>
+    <string name="camera">Tirar foto</string>
     <string name="picture_save_success">Foto salva ao %s</string>
     <string name="picture_save_failed">Falha ao salvar esta imagem.</string>
     <string name="file_overwrite_question">%s já existe, você quer substitui-lo ?</string>

app/src/main/res/values-ru/strings.xml

@@ -141,7 +141,7 @@
     <string name="copy_failed">Ошибка при копировании %s.</string>
     <string name="copy_success">Копирование выполнено!</string>
     <string name="fab_dialog_title">Добавить</string>
-    <string name="take_photo">Сфотографировать</string>
+    <string name="camera">Сфотографировать</string>
     <string name="picture_save_success">Изображение сохранено в %s</string>
     <string name="picture_save_failed">Невозможно сохранить изображение.</string>
     <string name="file_overwrite_question">%s уже существует, переписать его?</string>

app/src/main/res/values/strings.xml

@@ -146,9 +146,10 @@
     <string name="copy_failed">Copy of %s failed.</string>
     <string name="copy_success">Copy successful !</string>
     <string name="fab_dialog_title">Add</string>
-    <string name="take_photo">Take photo</string>
+    <string name="camera">Camera</string>
     <string name="picture_save_success">Picture saved to %s</string>
     <string name="picture_save_failed">Failed to save this picture.</string>
+    <string name="video_save_success">Video saved to %s</string>
     <string name="file_overwrite_question">%s already exists, do you want to overwrite it ?</string>
     <string name="dir_overwrite_question">%s already exists, do you want to merge its content ?</string>
     <string name="enter_new_name">Enter new name</string>

build.gradle

@@ -1,6 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.5.30"
+    ext.kotlin_version = "1.5.31"
     repositories {
         google()
         mavenCentral()