Improve video recording: fix freezes & ExoPlayer errors

app/CMakeLists.txt

@@ -72,4 +72,5 @@ target_link_libraries(
         avformat
         avcodec
         avutil
+        log
 )

app/src/main/java/androidx/camera/video/internal/encoder/SucklessEncoderImpl.java

@@ -1254,46 +1254,13 @@ public class SucklessEncoderImpl implements Encoder {
                         mVideoTimestampConverter.convertToUptimeUs(bufferInfo.presentationTimeUs);
             }
 
-            // MediaCodec may send out of order buffer
-            if (bufferInfo.presentationTimeUs <= mLastPresentationTimeUs) {
-                Logger.d(mTag, "Drop buffer by out of order buffer from MediaCodec.");
-                return false;
-            }
             mLastPresentationTimeUs = bufferInfo.presentationTimeUs;
 
-            // Ignore buffers are not in start/stop range. One situation is to ignore outdated
-            // frames when using the Surface of MediaCodec#createPersistentInputSurface. After
-            // the persistent Surface stops, it will keep a small number of old frames in its
-            // buffer, and send those old frames in the next startup.
-            if (!mStartStopTimeRangeUs.contains(bufferInfo.presentationTimeUs)) {
-                Logger.d(mTag, "Drop buffer by not in start-stop range.");
-                // If data hasn't reached the expected stop timestamp, set the stop timestamp.
-                if (mPendingCodecStop
-                        && bufferInfo.presentationTimeUs >= mStartStopTimeRangeUs.getUpper()) {
-                    if (mStopTimeoutFuture != null) {
-                        mStopTimeoutFuture.cancel(true);
-                    }
-                    mLastDataStopTimestamp = bufferInfo.presentationTimeUs;
-                    signalCodecStop();
-                    mPendingCodecStop = false;
-                }
-                return false;
-            }
-
             if (updatePauseRangeStateAndCheckIfBufferPaused(bufferInfo)) {
                 Logger.d(mTag, "Drop buffer by pause.");
                 return false;
             }
 
-            // We should check if the adjusted time is valid. see b/189114207.
-            if (getAdjustedTimeUs(bufferInfo) <= mLastSentAdjustedTimeUs) {
-                Logger.d(mTag, "Drop buffer by adjusted time is less than the last sent time.");
-                if (mIsVideoEncoder && isKeyFrame(bufferInfo)) {
-                    mIsKeyFrameRequired = true;
-                }
-                return false;
-            }
-
             if (!mHasFirstData && !mIsKeyFrameRequired && mIsVideoEncoder) {
                 mIsKeyFrameRequired = true;
             }

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

@@ -47,6 +47,7 @@ import sushi.hardcore.droidfs.databinding.ActivityCameraBinding
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.video_recording.AsynchronousSeekableWriter
 import sushi.hardcore.droidfs.video_recording.FFmpegMuxer
 import sushi.hardcore.droidfs.video_recording.SeekableWriter
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
@@ -510,17 +511,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                     .show()
                 return
             }
-            startTimerThen {
+            val writer = AsynchronousSeekableWriter(object : SeekableWriter {
-                var withAudio = true
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
-                        withAudio = false
-                    }
-                }
-                videoRecording = videoRecorder?.prepareRecording(
-                    this,
-                    MuxerOutputOptions(
-                        FFmpegMuxer(object : SeekableWriter {
                 private var offset = 0L
 
                 override fun close() {
@@ -531,16 +522,21 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                     this.offset = offset
                 }
 
-                            override fun write(buffer: ByteArray) {
+                override fun write(buffer: ByteArray, size: Int) {
-                                offset += encryptedVolume.write(fileHandle, offset, buffer, 0, buffer.size.toLong())
+                    offset += encryptedVolume.write(fileHandle, offset, buffer, 0, size.toLong())
                 }
             })
-                    )
+            val pendingRecording = videoRecorder!!.prepareRecording(
-                )?.apply {
+                this,
-                    if (withAudio) {
+                MuxerOutputOptions(FFmpegMuxer(writer))
-                        withAudioEnabled()
+            ).also {
+                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) {
+                    it.withAudioEnabled()
                 }
-                }?.start(executor) {
+            }
+            startTimerThen {
+                writer.start()
+                videoRecording = pendingRecording.start(executor) {
                     val buttons = arrayOf(binding.imageCaptureMode, binding.imageRatio, binding.imageTimer, binding.imageModeSwitch, binding.imageCameraSwitch)
                     when (it) {
                         is VideoRecordEvent.Start -> {

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

@@ -0,0 +1,68 @@
+package sushi.hardcore.droidfs.video_recording
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.Constants
+import java.nio.ByteBuffer
+
+class AsynchronousSeekableWriter(private val internalWriter: SeekableWriter): SeekableWriter {
+
+    internal enum class Operation { WRITE, SEEK, CLOSE }
+
+    internal class Task(
+        val operation: Operation,
+        val buffer: ByteArray? = null,
+        val offset: Long? = null,
+    )
+
+    private val channel = Channel<Task>(Channel.UNLIMITED)
+
+    private fun flush(buffer: ByteBuffer) {
+        internalWriter.write(buffer.array(), buffer.position())
+        buffer.position(0)
+    }
+
+    fun start() {
+        CoroutineScope(Dispatchers.IO).launch {
+            val buffer = ByteBuffer.allocate(Constants.IO_BUFF_SIZE)
+            while (true) {
+                val task = channel.receive()
+                when (task.operation) {
+                    Operation.WRITE -> {
+                        if (task.buffer!!.size > buffer.remaining()) {
+                            flush(buffer)
+                        }
+                        buffer.put(task.buffer)
+                    }
+                    Operation.SEEK -> {
+                        if (buffer.position() > 0) {
+                            flush(buffer)
+                        }
+                        internalWriter.seek(task.offset!!)
+                    }
+                    Operation.CLOSE -> {
+                        if (buffer.position() > 0) {
+                            flush(buffer)
+                        }
+                        internalWriter.close()
+                        break
+                    }
+                }
+            }
+        }
+    }
+
+    override fun write(buffer: ByteArray, size: Int) {
+        channel.trySend(Task(Operation.WRITE, buffer)).exceptionOrNull()?.let { throw it }
+    }
+
+    override fun seek(offset: Long) {
+        channel.trySend(Task(Operation.SEEK, offset = offset)).exceptionOrNull()?.let { throw it }
+    }
+
+    override fun close() {
+        channel.trySend(Task(Operation.CLOSE)).exceptionOrNull()?.let { throw it }
+    }
+}

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

@@ -7,7 +7,7 @@ import java.nio.ByteBuffer
 
 class FFmpegMuxer(val writer: SeekableWriter): MediaMuxer {
     external fun allocContext(): Long
-    external fun addVideoTrack(formatContext: Long, bitrate: Int, width: Int, height: Int, orientationHint: Int): Int
+    external fun addVideoTrack(formatContext: Long, bitrate: Int, frameRate: Int, width: Int, height: Int, orientationHint: 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)
@@ -54,6 +54,7 @@ class FFmpegMuxer(val writer: SeekableWriter): MediaMuxer {
             addVideoTrack(
                 formatContext!!,
                 bitrate,
+                mediaFormat.getInteger("frame-rate"),
                 mediaFormat.getInteger("width"),
                 mediaFormat.getInteger("height"),
                 orientation
@@ -82,7 +83,7 @@ class FFmpegMuxer(val writer: SeekableWriter): MediaMuxer {
     }
 
     fun writePacket(buff: ByteArray) {
-        writer.write(buff)
+        writer.write(buff, buff.size)
     }
     fun seek(offset: Long) {
         writer.seek(offset)

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

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

app/src/main/native/libmux.c

@@ -3,9 +3,36 @@
 #include <libavutil/channel_layout.h>
 #include <libavutil/display.h>
 #include <jni.h>
+#include <android/log.h>
 
+const char* LOG_TAG = "LIBMUX";
 const size_t BUFF_SIZE = 4096;
 
+int to_android_log_level(int level) {
+    switch (level) {
+        case AV_LOG_PANIC:
+        case AV_LOG_FATAL: return ANDROID_LOG_FATAL;
+        case AV_LOG_ERROR: return ANDROID_LOG_ERROR;
+        case AV_LOG_WARNING: return ANDROID_LOG_WARN;
+        case AV_LOG_INFO: return ANDROID_LOG_INFO;
+        default: return ANDROID_LOG_UNKNOWN;
+    }
+}
+
+void log_callback(void *ptr, int level, const char *fmt, va_list vl)
+{
+    char line[1024];
+    static int print_prefix = 1;
+    av_log_format_line(ptr, level, fmt, vl, line, sizeof(line), &print_prefix);
+    __android_log_print(to_android_log_level(level), LOG_TAG, "%s", line);
+}
+
+void log_err(int result, const char* name) {
+    if (result < 0) {
+        __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, "%s: %d", name, result);
+    }
+}
+
 struct Muxer {
     JavaVM* jvm;
     jobject thiz;
@@ -32,6 +59,8 @@ int64_t seek(void* opaque, int64_t offset, int whence) {
 }
 
 jlong Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_allocContext(JNIEnv *env, jobject thiz) {
+    av_log_set_callback(log_callback);
+    av_log_set_level(AV_LOG_INFO);
     const AVOutputFormat *format = av_guess_format("mp4", NULL, NULL);
     struct Muxer* muxer = malloc(sizeof(struct Muxer));
     (*env)->GetJavaVM(env, &muxer->jvm);
@@ -50,17 +79,14 @@ JNIEXPORT jint JNICALL
 Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_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);
     av_channel_layout_default(&codec_context->ch_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;
+    codec_context->time_base = (AVRational) {1, sample_rate};
-    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);
+    AVStream* stream = avformat_new_stream((AVFormatContext *) format_context, NULL);
     avcodec_parameters_from_context(stream->codecpar, codec_context);
     avcodec_free_context(&codec_context);
     return stream->index;
@@ -69,7 +95,9 @@ Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_addAudioTrack(JNIEnv *e
 JNIEXPORT jint JNICALL
 Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_addVideoTrack(JNIEnv *env, jobject thiz,
                                                                        jlong format_context,
-                                                                       jint bitrate, jint width,
+                                                                       jint bitrate,
+                                                                       jint frame_rate,
+                                                                       jint width,
                                                                        jint height,
                                                                        jint orientation_hint) {
     AVStream* stream = avformat_new_stream((AVFormatContext *) format_context, NULL);
@@ -78,6 +106,8 @@ Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_addVideoTrack(JNIEnv *e
     stream->codecpar->bit_rate = bitrate;
     stream->codecpar->width = width;
     stream->codecpar->height = height;
+    stream->codecpar->format = AV_PIX_FMT_YUVJ420P;
+    stream->time_base = (AVRational) {1, frame_rate};
     uint8_t* matrix = av_stream_new_side_data(stream, AV_PKT_DATA_DISPLAYMATRIX, sizeof(int32_t) * 9);
     av_display_rotation_set((int32_t *) matrix, orientation_hint);
     return stream->index;
@@ -85,7 +115,10 @@ Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_addVideoTrack(JNIEnv *e
 
 JNIEXPORT jint JNICALL
 Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_writeHeaders(JNIEnv *env, jobject thiz, jlong format_context) {
-    return avformat_write_header((AVFormatContext *) format_context, NULL);
+    av_dump_format((AVFormatContext *) format_context, 0, NULL, 1);
+    int result = avformat_write_header((AVFormatContext *) format_context, NULL);
+    log_err(result, "avformat_write_header");
+    return result;
 }
 
 JNIEXPORT void JNICALL
@@ -100,20 +133,21 @@ Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_writePacket(JNIEnv *env
     r.num = 1;
     r.den = 1000000;
     packet->pts = av_rescale_q(pts, r, ((AVFormatContext*)format_context)->streams[stream_index]->time_base);
+    packet->dts = packet->pts;
     uint8_t* buff = malloc(size);
     (*env)->GetByteArrayRegion(env, buffer, 0, size, (signed char*)buff);
     packet->data = buff;
     if (is_key_frame) {
         packet->flags = AV_PKT_FLAG_KEY;
     }
-    av_write_frame((AVFormatContext *)format_context, packet);
+    log_err(av_write_frame((AVFormatContext *)format_context, packet), "av_write_frame");
     free(buff);
     av_packet_free(&packet);
 }
 
 JNIEXPORT void JNICALL
 Java_sushi_hardcore_droidfs_video_1recording_FFmpegMuxer_writeTrailer(JNIEnv *env, jobject thiz, jlong format_context) {
-    av_write_trailer((AVFormatContext *) format_context);
+    log_err(av_write_trailer((AVFormatContext *) format_context), "av_write_trailer");
 }
 
 JNIEXPORT void JNICALL