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package io.antmedia.streamsource;
import static org.bytedeco.ffmpeg.global.avcodec.av_packet_free;
import static org.bytedeco.ffmpeg.global.avcodec.av_packet_ref;
import static org.bytedeco.ffmpeg.global.avcodec.av_packet_unref;
import static org.bytedeco.ffmpeg.global.avformat.av_read_frame;
import static org.bytedeco.ffmpeg.global.avformat.avformat_close_input;
import static org.bytedeco.ffmpeg.global.avformat.avformat_find_stream_info;
import static org.bytedeco.ffmpeg.global.avformat.avformat_open_input;
import static org.bytedeco.ffmpeg.global.avutil.AVMEDIA_TYPE_AUDIO;
import static org.bytedeco.ffmpeg.global.avutil.AVMEDIA_TYPE_VIDEO;
import static org.bytedeco.ffmpeg.global.avutil.av_dict_free;
import static org.bytedeco.ffmpeg.global.avutil.av_dict_set;
import static org.bytedeco.ffmpeg.global.avutil.av_rescale_q;
import java.util.List;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.bytedeco.ffmpeg.avcodec.AVPacket;
import org.bytedeco.ffmpeg.avformat.AVFormatContext;
import org.bytedeco.ffmpeg.avutil.AVDictionary;
import org.bytedeco.ffmpeg.avutil.AVRational;
import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.ffmpeg.global.avutil;
import org.red5.server.api.scope.IScope;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.antmedia.AntMediaApplicationAdapter;
import io.antmedia.AppSettings;
import io.antmedia.IApplicationAdaptorFactory;
import io.antmedia.datastore.db.DataStore;
import io.antmedia.datastore.db.types.Broadcast;
import io.antmedia.datastore.db.types.Endpoint;
import io.antmedia.muxer.MuxAdaptor;
import io.antmedia.muxer.RtmpMuxer;
import io.antmedia.rest.model.Result;
import io.vertx.core.Vertx;
public class StreamFetcher {
protected static Logger logger = LoggerFactory.getLogger(StreamFetcher.class);
private WorkerThread thread;
/**
* Connection setup timeout value
*/
private int timeout;
private boolean exceptionInThread = false;
/**
* Last packet received time
*/
private long lastPacketReceivedTime = 0;
private boolean threadActive = false;
private Result cameraError = new Result(false,"");
private static final int PACKET_RECEIVED_INTERVAL_TIMEOUT = 3000;
private IScope scope;
private AntMediaApplicationAdapter appInstance;
private long[] lastDTS;
private MuxAdaptor muxAdaptor = null;
/**
* If it is true, it restarts fetching everytime it disconnects
* if it is false, it does not restart
*/
private boolean restartStream = true;
/**
* This flag closes the stream in the worker thread. It should be a field of StreamFetcher.
* Because WorkerThread instance can be re-created and we can lost the flag value.
* This case causes stream NOT TO BE STOPPED
*/
private volatile boolean stopRequestReceived = false;
/**
* Buffer time in milliseconds
*/
private int bufferTime = 0;
private static final int COUNT_TO_LOG_BUFFER = 500;
private int bufferLogCounter;
private ConcurrentLinkedQueue availableBufferQueue = new ConcurrentLinkedQueue<>();
private AppSettings appSettings;
private Vertx vertx;
private DataStore dataStore;
public interface IStreamFetcherListener {
void streamFinished(IStreamFetcherListener listener);
}
IStreamFetcherListener streamFetcherListener;
private String streamUrl;
private String streamId;
private String streamType;
public IStreamFetcherListener getStreamFetcherListener() {
return streamFetcherListener;
}
public void setStreamFetcherListener(IStreamFetcherListener streamFetcherListener) {
this.streamFetcherListener = streamFetcherListener;
}
public StreamFetcher(String streamUrl, String streamId, String streamType, IScope scope, Vertx vertx) {
if (streamUrl == null || streamId == null) {
throw new NullPointerException("Stream is not initialized properly. Check "
+ " stream id ("+ streamId +") and stream url ("+ streamUrl + ") values");
}
this.streamUrl = streamUrl;
this.streamType = streamType;
this.streamId = streamId;
this.scope = scope;
this.vertx = vertx;
if (getAppSettings() == null) {
throw new NullPointerException("App Settings is null in StreamFetcher");
}
this.bufferTime = getAppSettings().getStreamFetcherBufferTime();
}
public Result prepareInput(AVFormatContext inputFormatContext) {
setConnectionTimeout(5000);
Result result = new Result(false);
if (inputFormatContext == null) {
logger.info("cannot allocate input context for {}", streamId);
return result;
}
AVDictionary optionsDictionary = new AVDictionary();
String transportType = appSettings.getRtspPullTransportType();
if (streamUrl.startsWith("rtsp://") && !transportType.isEmpty()) {
logger.info("Setting rtsp transport type to {} for stream source: {}", transportType, streamUrl);
av_dict_set(optionsDictionary, "rtsp_transport", transportType, 0);
}
String timeoutStr = String.valueOf(this.timeout);
av_dict_set(optionsDictionary, "stimeout", timeoutStr, 0);
int ret;
logger.debug("stream url: {} " , streamUrl);
if ((ret = avformat_open_input(inputFormatContext, streamUrl, null, optionsDictionary)) < 0) {
byte[] data = new byte[100];
avutil.av_strerror(ret, data, data.length);
String errorStr=new String(data, 0, data.length);
result.setMessage(errorStr);
logger.error("cannot open stream: {} with error:: {}", streamUrl, result.getMessage());
av_dict_free(optionsDictionary);
optionsDictionary.close();
return result;
}
av_dict_free(optionsDictionary);
optionsDictionary.close();
ret = avformat_find_stream_info(inputFormatContext, (AVDictionary) null);
if (ret < 0) {
result.setMessage("Could not find stream information\n");
logger.error(result.getMessage());
return result;
}
lastDTS = new long[inputFormatContext.nb_streams()];
for (int i = 0; i < lastDTS.length; i++) {
lastDTS[i] = -1;
}
result.setSuccess(true);
return result;
}
public Result prepare(AVFormatContext inputFormatContext) {
Result result = prepareInput(inputFormatContext);
setCameraError(result);
return result;
}
public class WorkerThread extends Thread {
private static final int PACKET_WRITER_PERIOD_IN_MS = 10;
private static final long STREAM_FETCH_RE_TRY_PERIOD_MS = 3000;
private volatile boolean streamPublished = false;
protected AtomicBoolean isJobRunning = new AtomicBoolean(false);
AVFormatContext inputFormatContext = null;
private volatile boolean buffering = false;
private ConcurrentLinkedQueue bufferQueue = new ConcurrentLinkedQueue<>();
private volatile long bufferingFinishTimeMs;
private volatile long firstPacketReadyToSentTimeMs;
private long lastPacketTimeMsInQueue;
@Override
public void run() {
setThreadActive(true);
long firstPacketTime = 0;
long bufferDuration = 0;
long timeOffset = 0;
AVPacket pkt = null;
long packetWriterJobName = -1L;
try {
inputFormatContext = new AVFormatContext(null);
pkt = avcodec.av_packet_alloc();
logger.info("Preparing the StreamFetcher for {}", streamUrl);
Result result = prepare(inputFormatContext);
if (result.isSuccess()) {
boolean audioExist = false;
boolean videoExist = false;
for (int i = 0; i < inputFormatContext.nb_streams(); i++) {
if (inputFormatContext.streams(i).codecpar().codec_type() == AVMEDIA_TYPE_AUDIO) {
audioExist = true;
if(avcodec.avcodec_find_decoder(inputFormatContext.streams(i).codecpar().codec_id()) == null) {
logger.error("avcodec_find_decoder() error: Unsupported audio format or codec not found");
audioExist = false;
}
}
else if (inputFormatContext.streams(i).codecpar().codec_type() == AVMEDIA_TYPE_VIDEO) {
videoExist = true;
if(avcodec.avcodec_find_decoder(inputFormatContext.streams(i).codecpar().codec_id()) == null) {
logger.error("avcodec_find_decoder() error: Unsupported video format or codec not found");
videoExist = false;
}
}
}
muxAdaptor = MuxAdaptor.initializeMuxAdaptor(null,true, scope);
// if there is only audio, firstKeyFrameReceivedChecked should be true in advance
// because there is no video frame
muxAdaptor.setFirstKeyFrameReceivedChecked(!videoExist);
muxAdaptor.setEnableVideo(videoExist);
muxAdaptor.setEnableAudio(audioExist);
muxAdaptor.setBroadcast(getDataStore().get(streamId));
//if stream is rtsp, then it's not AVC
muxAdaptor.setAvc(!streamUrl.toLowerCase().startsWith("rtsp"));
setUpEndPoints(streamId, muxAdaptor);
muxAdaptor.init(scope, streamId, false);
logger.info("{} stream count in stream {} is {}", streamId, streamUrl, inputFormatContext.nb_streams());
if(muxAdaptor.prepareFromInputFormatContext(inputFormatContext)) {
while (av_read_frame(inputFormatContext, pkt) >= 0) {
if(!streamPublished) {
long currentTime = System.currentTimeMillis();
muxAdaptor.setStartTime(currentTime);
getInstance().startPublish(streamId, 0, "Pull");
if (bufferTime > 0) {
packetWriterJobName = vertx.setPeriodic(PACKET_WRITER_PERIOD_IN_MS, l->
vertx.executeBlocking(h-> {
writeBufferedPacket();
h.complete();
}, false, null)
);
}
}
streamPublished = true;
lastPacketReceivedTime = System.currentTimeMillis();
/**
* Check that dts values are monotically increasing for each stream
*/
int packetIndex = pkt.stream_index();
if (lastDTS[packetIndex] >= pkt.dts()) {
logger.info("last dts{} is bigger than incoming dts {}", pkt.dts(), lastDTS[packetIndex]);
pkt.dts(lastDTS[packetIndex] + 1);
}
lastDTS[packetIndex] = pkt.dts();
if (pkt.dts() > pkt.pts()) {
logger.info("dts ({}) is bigger than pts({})", pkt.dts(), pkt.pts());
pkt.pts(pkt.dts());
}
/***************************************************
* Memory of being paranoid or failing while looking for excellence without understanding the whole picture
*
* Increasing pkt.dts plus 1 is a simple hack for fixing dts error if current dts has a value lower
* than the last received dts. Because dts should be monotonically increasing. I made this simple hack and it is working.
* After that I thought the same may happen for the pts value as well and I have added below fix.
* Actually not a fix, it is a bug. Because pts values does not have to be monotonically increasing
* and if stream has B-Frames then pts value can be lower than the last PTS value. So below
* code snippet make the stream does not play smoothly. It took about 10 hours to find it this error.
*
* I have written this simple memory for me
* and for the guys who is developing or reviewing this code.
* Even if it is time consuming or not reasonable, these kind of tryouts sometimes makes me excited.
* I think I may expect to find something great by trying something crazy :)
*
* @mekya - June 12, 2018
*
* ---------------------------------------------------
*
* if (lastPTS[packetIndex] >= pkt.pts()) {
* pkt.pts(lastPTS[packetIndex] + 1);
* }
* lastPTS[packetIndex] = pkt.pts();
*
******************************************************/
if (bufferTime > 0)
{
/*
* If there is a bufferTime in the server.
* Generally we don't use this feature most of the time
*/
AVPacket packet = getAVPacket();
av_packet_ref(packet, pkt);
bufferQueue.add(packet);
AVPacket pktHead = bufferQueue.peek();
/**
* BufferQueue may be polled in writer thread.
* It's a very rare case to happen so that check if it's null
*/
if (pktHead != null) {
lastPacketTimeMsInQueue = av_rescale_q(pkt.pts(), inputFormatContext.streams(pkt.stream_index()).time_base(), MuxAdaptor.TIME_BASE_FOR_MS);
firstPacketTime = av_rescale_q(pktHead.pts(), inputFormatContext.streams(pktHead.stream_index()).time_base(), MuxAdaptor.TIME_BASE_FOR_MS);
bufferDuration = (lastPacketTimeMsInQueue - firstPacketTime);
if ( bufferDuration > bufferTime) {
if (buffering) {
//have the buffering finish time ms
bufferingFinishTimeMs = System.currentTimeMillis();
//have the first packet sent time
firstPacketReadyToSentTimeMs = firstPacketTime;
}
buffering = false;
}
logBufferStatus();
}
}
else {
if(AntMediaApplicationAdapter.VOD.equals(streamType)) {
if(firstPacketTime == 0) {
int streamIndex = pkt.stream_index();
firstPacketTime = System.currentTimeMillis();
long firstPacketDtsInMs = av_rescale_q(pkt.dts(), inputFormatContext.streams(streamIndex).time_base(), MuxAdaptor.TIME_BASE_FOR_MS);
timeOffset = 0 - firstPacketDtsInMs;
}
long latestTime = System.currentTimeMillis();
int streamIndex = pkt.stream_index();
AVRational timeBase = inputFormatContext.streams(streamIndex).time_base();
long pktTime = av_rescale_q(pkt.dts(), timeBase, MuxAdaptor.TIME_BASE_FOR_MS);
long durationInMs = latestTime - firstPacketTime;
long dtsInMS= timeOffset + pktTime;
while(dtsInMS > durationInMs) {
durationInMs = System.currentTimeMillis() - firstPacketTime;
Thread.sleep(1);
}
}
muxAdaptor.writePacket(inputFormatContext.streams(pkt.stream_index()), pkt);
}
av_packet_unref(pkt);
if (stopRequestReceived) {
logger.warn("Stop request received, breaking the loop for {} ", streamId);
break;
}
}
logger.info("Leaving the stream fetcher loop for stream: {}", streamId);
}
else {
logger.error("MuxAdaptor.Prepare for {} returned false", streamId);
}
setCameraError(result);
}
else {
logger.error("Prepare for opening the {} has failed", streamUrl);
}
}
catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
catch (OutOfMemoryError | Exception e) {
logger.error(ExceptionUtils.getStackTrace(e));
exceptionInThread = true;
}
if (packetWriterJobName != -1) {
logger.info("Removing packet writer job {}", packetWriterJobName);
vertx.cancelTimer(packetWriterJobName);
}
writeAllBufferedPackets();
if (muxAdaptor != null) {
logger.info("Writing trailer in Muxadaptor {}", streamId);
muxAdaptor.writeTrailer();
appInstance.muxAdaptorRemoved(muxAdaptor);
muxAdaptor = null;
}
if (pkt != null) {
av_packet_free(pkt);
pkt.close();
}
if (inputFormatContext != null) {
try {
avformat_close_input(inputFormatContext);
}
catch (Exception e) {
logger.info(e.getMessage());
}
inputFormatContext = null;
}
if(streamPublished) {
getInstance().closeBroadcast(streamId);
streamPublished=false;
}
setThreadActive(false);
if(streamFetcherListener != null) {
stopRequestReceived = true;
restartStream = false;
streamFetcherListener.streamFinished(streamFetcherListener);
}
if(!stopRequestReceived && restartStream) {
logger.info("Stream fetcher will try to fetch source {} after {} ms", streamUrl, STREAM_FETCH_RE_TRY_PERIOD_MS);
vertx.setTimer(STREAM_FETCH_RE_TRY_PERIOD_MS, l -> {
thread = new WorkerThread();
thread.start();
});
}
logger.debug("Leaving thread for {}", streamUrl);
stopRequestReceived = false;
}
private void setUpEndPoints(String publishedName, MuxAdaptor muxAdaptor) {
Broadcast broadcast = getDataStore().get(publishedName);
if (broadcast != null) {
List endPointList = broadcast.getEndPointList();
if (endPointList != null && !endPointList.isEmpty())
{
for (Endpoint endpoint : endPointList) {
muxAdaptor.addMuxer(new RtmpMuxer(endpoint.getRtmpUrl(), vertx));
}
}
}
}
private void writeAllBufferedPackets()
{
synchronized (this) {
//different threads may write writeBufferedPacket and this method at the same time
logger.info("write all buffered packets for stream: {}", streamId);
while (!bufferQueue.isEmpty()) {
AVPacket pkt = bufferQueue.poll();
muxAdaptor.writePacket(inputFormatContext.streams(pkt.stream_index()), pkt);
av_packet_unref(pkt);
}
AVPacket pkt;
while ((pkt = bufferQueue.poll()) != null) {
pkt.close();
}
while ((pkt = availableBufferQueue.poll()) != null) {
pkt.close();
}
}
}
//TODO: Code dumplication with MuxAdaptor.writeBufferedPacket. It should be refactored.
public void writeBufferedPacket()
{
synchronized (this) {
if (isJobRunning.compareAndSet(false, true))
{
if (!buffering) {
while(!bufferQueue.isEmpty()) {
AVPacket tempPacket = bufferQueue.peek();
long pktTime = av_rescale_q(tempPacket.pts(), inputFormatContext.streams(tempPacket.stream_index()).time_base(), MuxAdaptor.TIME_BASE_FOR_MS);
long now = System.currentTimeMillis();
long pktTimeDifferenceMs = pktTime - firstPacketReadyToSentTimeMs;
long passedTime = now - bufferingFinishTimeMs;
if (pktTimeDifferenceMs < passedTime) {
muxAdaptor.writePacket(inputFormatContext.streams(tempPacket.stream_index()), tempPacket);
av_packet_unref(tempPacket);
bufferQueue.remove(); //remove the packet from the queue
availableBufferQueue.offer(tempPacket);
}
else {
//break the loop and don't block the thread because it's not correct time to send the packet
break;
}
}
//update buffering. If bufferQueue is empty, it should start buffering
buffering = bufferQueue.isEmpty();
}
logBufferStatus();
isJobRunning.compareAndSet(true, false);
}
}
}
public void logBufferStatus() {
bufferLogCounter++; //we use this parameter in execute method as well
if (bufferLogCounter % COUNT_TO_LOG_BUFFER == 0) {
logger.info("WriteBufferedPacket -> Buffering status {}, buffer duration {}ms buffer time {}ms stream: {}", buffering, getBufferedDurationMs(), bufferTime, streamId);
bufferLogCounter = 0;
}
}
public long getBufferedDurationMs() {
AVPacket pktHead = bufferQueue.peek();
if (pktHead != null) {
long firstPacketInQueueTime = av_rescale_q(pktHead.pts(), inputFormatContext.streams(pktHead.stream_index()).time_base(), MuxAdaptor.TIME_BASE_FOR_MS);
return lastPacketTimeMsInQueue - firstPacketInQueueTime;
}
return 0;
}
}
public void startStream() {
new Thread() {
@Override
public void run() {
try {
int i = 0;
while (threadActive) {
Thread.sleep(100);
if (i % 50 == 0) {
logger.info("waiting for thread to be finished for stream {}", streamUrl);
i = 0;
}
i++;
}
Thread.sleep(2000);
} catch (InterruptedException e) {
logger.error(e.getMessage());
Thread.currentThread().interrupt();
}
exceptionInThread = false;
thread = new WorkerThread();
thread.start();
logger.info("StartStream called, new thread is started for {}", streamId);
}
}.start();
}
public DataStore getDataStore() {
if (dataStore == null) {
dataStore = getInstance().getDataStore();
}
return dataStore;
}
public void setDataStore(DataStore dataStore) {
this.dataStore = dataStore;
}
public AVPacket getAVPacket() {
if (!availableBufferQueue.isEmpty()) {
return availableBufferQueue.poll();
}
return new AVPacket();
}
/**
* If thread is alive and receiving packet with in the {@link PACKET_RECEIVED_INTERVAL_TIMEOUT} time
* mean it is running
* @return true if it is running and false it is not
*/
public boolean isStreamAlive() {
return ((System.currentTimeMillis() - lastPacketReceivedTime) < PACKET_RECEIVED_INTERVAL_TIMEOUT);
}
public boolean isStopped() {
return thread.isInterrupted();
}
public void stopStream()
{
logger.warn("stop stream called for {}", streamUrl);
stopRequestReceived = true;
}
public boolean isStopRequestReceived() {
return stopRequestReceived;
}
public WorkerThread getThread() {
return thread;
}
public void setThread(WorkerThread thread) {
this.thread = thread;
}
public void restart() {
stopStream();
new Thread() {
@Override
public void run() {
try {
while (threadActive) {
Thread.sleep(100);
}
Thread.sleep(2000);
} catch (InterruptedException e) {
logger.error(e.getMessage());
Thread.currentThread().interrupt();
}
startStream();
}
}.start();
}
/**
* Set timeout when establishing connection
* @param timeoutMs in ms
*/
public void setConnectionTimeout(int timeoutMs) {
this.timeout = timeoutMs * 1000;
}
public boolean isExceptionInThread() {
return exceptionInThread;
}
public void setThreadActive(boolean threadActive) {
this.threadActive = threadActive;
}
public boolean isThreadActive() {
return threadActive;
}
public Result getCameraError() {
return cameraError;
}
public void setCameraError(Result cameraError) {
this.cameraError = cameraError;
}
public IScope getScope() {
return scope;
}
public void setScope(IScope scope) {
this.scope = scope;
}
public AntMediaApplicationAdapter getInstance() {
if (appInstance == null) {
appInstance = ((IApplicationAdaptorFactory) scope.getContext().getApplicationContext().getBean(AntMediaApplicationAdapter.BEAN_NAME)).getAppAdaptor();
}
return appInstance;
}
public MuxAdaptor getMuxAdaptor() {
return muxAdaptor;
}
public void setMuxAdaptor(MuxAdaptor muxAdaptor) {
this.muxAdaptor = muxAdaptor;
}
public boolean isRestartStream() {
return restartStream;
}
public void setRestartStream(boolean restartStream) {
this.restartStream = restartStream;
}
public int getBufferTime() {
return bufferTime;
}
public void setBufferTime(int bufferTime) {
this.bufferTime = bufferTime;
}
private AppSettings getAppSettings() {
if (appSettings == null) {
appSettings = (AppSettings) scope.getContext().getApplicationContext().getBean(AppSettings.BEAN_NAME);
}
return appSettings;
}
/**
* This is for test purposes
* @param stopRequest
*/
public void debugSetStopRequestReceived(boolean stopRequest) {
stopRequestReceived = stopRequest;
}
public String getStreamId() {
return streamId;
}
public String getStreamUrl() {
return streamUrl;
}
public void setStreamId(String streamId) {
this.streamId = streamId;
}
public void setStreamUrl(String streamUrl) {
this.streamUrl = streamUrl;
}
}
