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tcrelay.cpp
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tcrelay.cpp
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// Copyright © 2021 Michael Thornburgh
// SPDX-License-Identifier: MIT
// TODO:
// * don't relay setPeerInfo
// * happy eyeballs for RTMP (handle multiple addresses from getaddrinfo))
// * use URIs for dest
// - rewrite connect tcUrl
// * RTMPS (at least output)
#include <cassert>
#include <cerrno>
#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <cstring>
extern "C" {
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
}
#include "rtmfp/rtmfp.hpp"
#include "rtmfp/RunLoops.hpp"
#include "rtmfp/FlashCryptoAdapter_OpenSSL.hpp"
#include "rtmfp/PerformerPosixPlatformAdapter.hpp"
#include "rtmfp/TCMessage.hpp"
#include "rtmfp/FlowSyncManager.hpp"
#include "rtmfp/ReorderBuffer.hpp"
#include "rtmfp/RedirectorClient.hpp"
#include "rtmfp/Hex.hpp"
#include "RTMP.hpp"
#include "PosixStreamPlatformAdapter.hpp"
#include "redirectorspec.hpp"
#include "RTWebSocket.hpp"
#include "SimpleWebSocket.hpp"
#include "SimpleWebSocketMessagePlatformAdapter.hpp"
using namespace com::zenomt;
using namespace com::zenomt::rtmfp;
using namespace com::zenomt::rtmp;
using namespace com::zenomt::websock;
// need to keep rtws:: qualifier to avoid collisions with RTMFP SendFlow/RecvFlow.
namespace {
class Connection; class Client;
enum Protocol { PROTO_UNSPEC, PROTO_RTMP, PROTO_RTMP_SIMPLE, PROTO_RTWS, PROTO_RTMFP };
enum {
TC_VIDEO_COMMAND_RANDOM_ACCESS_CHECKPOINT = 3
};
int verbose = 0;
int port = 1935;
bool requireHMAC = true;
bool requireSSEQ = true;
bool interleave = false;
bool sendVideoCheckpoint = false;
bool replayCheckpointFrame = true;
bool collapseAudioGaps = false;
Time videoLifetime = 2.0;
Time audioLifetime = 2.2;
Time finishByMargin = 0.1;
Time previousGopStartByMargin = 0.1;
Time checkpointLifetime = 4.5;
Time reorderWindowPeriod = 1.0;
Time delaycc_delay = INFINITY;
ReceiveOrder mediaReceiveIntent = RO_SEQUENCE;
bool expirePreviousGop = true;
bool interrupted = false;
bool stopping = false;
Protocol inputProtocol = PROTO_UNSPEC;
Protocol outputProtocol = PROTO_UNSPEC;
const char *desthostname = nullptr;
const char *destservname = "1935";
const char *overrideRtmfpUri = nullptr;
const char *backupRtmfpUri = "rtmfp:";
int dscp = 0;
PreferredRunLoop mainRL;
Performer mainPerformer(&mainRL);
PreferredRunLoop workerRL;
Performer workerPerformer(&workerRL);
PreferredRunLoop lookupRL;
Performer lookupPerformer(&lookupRL);
std::set<std::shared_ptr<Client>> clients;
void lookup(const std::function<void(const std::vector<Address> &results)> &onresult)
{
lookupPerformer.perform([onresult] {
int error = 0;
auto results = Address::lookup(desthostname, destservname, &error);
if(error)
printf("address lookup: %s\n", gai_strerror(error));
mainPerformer.perform([onresult, results] { onresult(results); });
});
}
class Connection : public Object {
public:
~Connection()
{
if(verbose > 1) printf("~Connection %p\n", (void *)this);
}
virtual void close()
{
if(m_open)
{
if(verbose and (m_videoMessages or m_audioMessages or m_videoMessagesLate or m_audioMessagesLate))
printf("Connection %p video abn %lu/%lu (%lu late) audio abn %lu/%lu (%lu late)\n", (void *)this, (unsigned long)m_videoMessagesAbandoned, (unsigned long)m_videoMessages, (unsigned long)m_videoMessagesLate, (unsigned long)m_audioMessagesAbandoned, (unsigned long)m_audioMessages, (unsigned long)m_audioMessagesLate);
}
m_open = false;
}
virtual void shutdown() = 0;
bool isFinished() const { return m_finished; }
std::shared_ptr<WriteReceipt> write(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const void *payload, size_t len)
{
const uint8_t *data = (const uint8_t *)payload;
Time startWithin = INFINITY;
bool isVideoCodingLayer = false;
auto &streamState = m_streamStates[streamID];
if(collapseAudioGaps)
{
uint32_t adjustedTimestamp = timestamp ? timestamp - streamState.m_timestampShift : 0;
if(TCMSG_AUDIO == messageType)
{
uint32_t lastTS = streamState.m_lastAudioTimestamp;
if(adjustedTimestamp and lastTS and Message::timestamp_gt(adjustedTimestamp, lastTS + 1536/48)) // XXX 48kHz AAC only
{
streamState.m_timestampShift = (timestamp - lastTS) - 1024/48; // XXX need real audio frame duration
adjustedTimestamp = timestamp - streamState.m_timestampShift;
if(verbose) printf("Connection %p stream %lu new timestamp shift %lu at %lu\n", (void *)this, (unsigned long)streamID, (unsigned long)(streamState.m_timestampShift), (unsigned long)adjustedTimestamp);
}
}
timestamp = adjustedTimestamp;
}
switch(messageType)
{
case TCMSG_VIDEO:
if(collapseAudioGaps and Message::timestamp_lt(timestamp, streamState.m_lastVideoTimestamp))
timestamp = streamState.m_lastVideoTimestamp + 5;
streamState.m_lastVideoTimestamp = timestamp;
if(isVideoCheckpointCommand(data, len))
{
if(replayCheckpointFrame)
{
if(Message::timestamp_gt(timestamp, streamState.m_lastKeyframeTimestamp) and streamState.m_lastKeyframe.size())
{
write(streamID, TCMSG_VIDEO, timestamp, streamState.m_lastKeyframe.data(), streamState.m_lastKeyframe.size());
if(verbose) printf("Connection %p stream %lu replay keyframe at %lu\n", (void *)this, (unsigned long)streamID, (unsigned long)timestamp);
}
return nullptr;
}
else
startWithin = checkpointLifetime; // forward (or delete if checkpointLifetime < 0)
}
else if(not isVideoSequenceSpecial(data, len))
{
startWithin = videoLifetime;
isVideoCodingLayer = true;
}
break;
case TCMSG_AUDIO:
streamState.m_lastAudioTimestamp = timestamp;
if(not isAudioSequenceSpecial(data, len))
startWithin = audioLifetime;
break;
}
Time finishWithin = startWithin + finishByMargin;
auto rv = basicWrite(streamID, messageType, timestamp, data, len, startWithin, finishWithin);
if(rv and isVideoCodingLayer)
{
if(Message::isVideoKeyframe(data, len))
{
streamState.m_chain.expire(
expirePreviousGop ? mainRL.getCurrentTime() + previousGopStartByMargin : INFINITY,
expirePreviousGop ? mainRL.getCurrentTime() + finishByMargin : INFINITY);
if(replayCheckpointFrame)
{
streamState.m_lastKeyframe = Bytes(data, data + len);
streamState.m_lastKeyframeTimestamp = timestamp;
}
if(sendVideoCheckpoint)
{
uint8_t command[] = { TC_VIDEO_FRAMETYPE_COMMAND | TC_VIDEO_CODEC_NONE, TC_VIDEO_COMMAND_RANDOM_ACCESS_CHECKPOINT };
basicWrite(streamID, TCMSG_VIDEO, timestamp, command, sizeof(command), checkpointLifetime, checkpointLifetime);
}
}
if(startWithin < INFINITY)
streamState.m_chain.append(rv);
}
if(rv and verbose)
rv->onFinished = [messageType, this] (bool abandoned) {
if(abandoned)
{
printf("-");
fflush(stdout);
}
switch(messageType)
{
case TCMSG_VIDEO:
m_videoMessages++;
if(abandoned)
m_videoMessagesAbandoned++;
break;
case TCMSG_AUDIO:
m_audioMessages++;
if(abandoned)
m_audioMessagesAbandoned++;
break;
default:
break;
}
};
return rv;
}
std::function<void(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len)> onmessage;
Task onerror;
Task onShutdownCompleteCallback;
protected:
virtual std::shared_ptr<WriteReceipt> basicWrite(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin) = 0;
void callOnError()
{
onmessage = nullptr;
Task cb;
swap(cb, onerror);
if(cb)
cb();
}
void callOnShutdownComplete()
{
callOnError();
Task cb;
m_finished = true;
swap(cb, onShutdownCompleteCallback);
if(cb)
cb();
}
bool isVideoSequenceSpecial(const uint8_t *payload, size_t len) const
{
if(isVideoCheckpointCommand(payload, len))
return false;
return Message::isVideoSequenceSpecial(payload, len);
}
bool isVideoCheckpointCommand(const uint8_t *payload, size_t len) const
{
if(len < 2)
return false;
if(TC_VIDEO_FRAMETYPE_COMMAND != (payload[0] & TC_VIDEO_FRAMETYPE_MASK))
return false;
if(Message::isVideoEnhanced(payload, len) or (TC_VIDEO_CODEC_AVC == Message::getVideoCodec(payload, len)))
{
if(len < 6)
return false;
return TC_VIDEO_COMMAND_RANDOM_ACCESS_CHECKPOINT == payload[5];
}
else
return TC_VIDEO_COMMAND_RANDOM_ACCESS_CHECKPOINT == payload[1];
}
bool isAudioSequenceSpecial(const uint8_t *payload, size_t len) const
{
if(0 == len)
return true;
if(len < 2)
return false;
return (TC_AUDIO_CODEC_AAC == (payload[0] & TC_AUDIO_CODEC_MASK)) and (TC_AUDIO_AACPACKET_AUDIO_SPECIFIC_CONFIG == payload[1]);
}
struct StreamState {
WriteReceiptChain m_chain;
Bytes m_lastKeyframe;
uint32_t m_lastKeyframeTimestamp { 0 };
uint32_t m_lastVideoTimestamp { 0 };
uint32_t m_lastAudioTimestamp { 0 };
uint32_t m_timestampShift { 0 };
};
std::map<uint32_t, StreamState> m_streamStates;
bool m_open = { true };
bool m_finished = { false };
size_t m_videoMessages { 0 };
size_t m_videoMessagesAbandoned { 0 };
size_t m_videoMessagesLate { 0 };
size_t m_audioMessages { 0 };
size_t m_audioMessagesAbandoned { 0 };
size_t m_audioMessagesLate { 0 };
};
class RTMPConnection : public Connection {
public:
static std::shared_ptr<RTMPConnection> newRTMPConnection(bool isServer) {
auto conn = share_ref(new RTMPConnection(isServer), false);
conn->m_rtmp->onmessage = [conn] (uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len) {
if((TCMSG_USER_CONTROL == messageType) and (len >= 2) and (((TC_USERCONTROL_FLOW_SYNC >> 8) & 0xff) == payload[0]) and ((TC_USERCONTROL_FLOW_SYNC & 0xff) == payload[1]))
{
if(verbose)
printf("ignoring TC_USERCONTROL_FLOW_SYNC from RTMP\n");
return;
}
if(conn->onmessage)
conn->onmessage(streamID, messageType, timestamp, payload, len);
};
conn->m_rtmp->onerror = [conn] { conn->callOnError(); };
conn->m_adapter->onShutdownCompleteCallback = [conn] { conn->callOnShutdownComplete(); };
return conn;
}
RTMPConnection(bool isServer) : m_connectionOpen(false)
{
m_adapter = share_ref(new PosixStreamPlatformAdapter(&mainRL), false);
m_rtmp = share_ref(new RTMP(m_adapter), false);
m_rtmp->init(isServer);
m_rtmp->minOutstandingThresh = 16 * 1024; // default 64KB probably too big
m_rtmp->maxAdditionalDelay = (delaycc_delay < INFINITY) ? delaycc_delay : 120.0;
if(PROTO_RTMP_SIMPLE == (isServer ? inputProtocol : outputProtocol))
{
m_rtmp->setSimpleMode(true);
m_rtmp->setChunkSize(1<<24); // maximum message size
m_rtmp->minOutstandingThresh = m_rtmp->outstandingThresh = SIZE_MAX;
}
}
bool setFd(int fd)
{
int tos = dscp << 2;
setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos));
if(not m_adapter->setSocketFd(fd))
{
::close(fd);
return false;
}
m_connectionOpen = true;
return true;
}
void openConnection()
{
auto myself = share_ref(this);
lookup([this, myself] (const std::vector<Address> &results) {
if(m_open)
{
if(results.empty())
goto error;
auto addr = results.front();
if(verbose) printf("connecting to %s\n", addr.toPresentation().c_str());
int fd = socket(addr.getFamily(), SOCK_STREAM, IPPROTO_TCP);
if(fd < 0)
{
::perror("socket");
goto error;
}
{
int flags = fcntl(fd, F_GETFL);
flags |= O_NONBLOCK;
fcntl(fd, F_SETFL, flags); // just so connect() won't block
}
if((connect(fd, addr.getSockaddr(), addr.getSockaddrLen()) < 0) and (EINPROGRESS != errno))
{
::perror("connect");
::close(fd);
goto error;
}
if(not setFd(fd))
goto error;
}
return;
error:
callOnError();
(void) myself;
});
m_connectionOpen = true;
}
void close() override
{
Connection::close();
m_rtmp->close();
}
void shutdown() override
{
retain();
close();
m_adapter->close();
release();
}
protected:
std::shared_ptr<WriteReceipt> basicWrite(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin) override
{
if(not m_connectionOpen)
openConnection(); // lazy open outgoing connections so we know client is talking RTMP
Priority pri = PRI_ROUTINE;
switch(messageType)
{
case TCMSG_COMMAND:
case TCMSG_COMMAND_EX:
pri = PRI_IMMEDIATE;
break;
case TCMSG_AUDIO:
case TCMSG_DATA:
case TCMSG_DATA_EX:
pri = interleave ? PRI_PRIORITY : PRI_IMMEDIATE;
break;
case TCMSG_VIDEO:
pri = PRI_PRIORITY;
break;
}
return m_rtmp->write(pri, streamID, messageType, timestamp, payload, len, startWithin, finishWithin);
}
std::shared_ptr<PosixStreamPlatformAdapter> m_adapter;
std::shared_ptr<RTMP> m_rtmp;
bool m_connectionOpen;
};
class RTMFPConnection : public Connection {
public:
void close() override
{
Connection::close();
if(m_controlSend)
m_controlSend->close();
if(m_controlRecv)
m_controlRecv->close(); // needed for AIR compatibility; this is not good, clean close should be on all RecvFlows closing.
m_netStreams.clear(); // closes all NetStream SendFlows
checkFinishedLater();
}
void shutdown() override
{
auto recvFlows = m_recvFlows;
for(auto it = recvFlows.begin(); it != recvFlows.end(); it++)
(*it)->close();
m_recvFlows.clear();
close();
}
bool acceptControl(const std::shared_ptr<RecvFlow> &controlRecv)
{
assert(not m_controlRecv);
uint32_t streamID = 0;
if((not TCMetadata::parse(controlRecv->getMetadata(), &streamID, nullptr)) or (0 != streamID))
return false;
if(not m_controlSend)
{
m_controlSend = controlRecv->openReturnFlow(TCMetadata::encode(0, RO_SEQUENCE), PRI_IMMEDIATE);
if(not m_controlSend)
return false;
wireControlSend();
}
controlRecv->onComplete = [this] (bool error) { callOnError(); };
if(verbose)
controlRecv->onFarAddressDidChange = [this, controlRecv] { printf("RTMFPConnection %p address changed %s\n", (void *)this, controlRecv->getFarAddress().toPresentation().c_str()); };
controlRecv->accept();
m_controlRecv = controlRecv;
setOnMessage(controlRecv, 0, nullptr);
controlRecv->setSessionCongestionDelay(delaycc_delay);
controlRecv->setSessionTrafficClass(dscp << 2);
return true;
}
protected:
struct NetStream {
~NetStream()
{
if(m_video) m_video->close();
if(m_audio) m_audio->close();
if(m_data) m_data->close();
}
SendFlow * openFlowForType(const std::shared_ptr<RecvFlow> &control, uint32_t streamID, uint8_t messageType)
{
Priority pri = PRI_IMMEDIATE;
ReceiveOrder rxIntent = RO_SEQUENCE;
std::shared_ptr<SendFlow> *flowRef = &m_data;
if(TCMSG_VIDEO == messageType)
{
flowRef = &m_video;
if(not interleave)
pri = PRI_PRIORITY; // lower than audio/data but still time-critical
rxIntent = mediaReceiveIntent;
}
else if(TCMSG_AUDIO == messageType)
{
flowRef = &m_audio;
rxIntent = mediaReceiveIntent;
}
if(not *flowRef)
{
*flowRef = control->openReturnFlow(TCMetadata::encode(streamID, rxIntent), pri);
if(interleave)
m_video = m_audio = m_data = *flowRef;
}
return flowRef->get();
}
std::shared_ptr<WriteReceipt> write(const std::shared_ptr<RecvFlow> &control, uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin)
{
if(not control)
return nullptr; // connection must be open before we can write to NetStream flows
auto flow = openFlowForType(control, streamID, messageType);
if(not flow)
return nullptr;
return flow->write(TCMessage::message(messageType, timestamp, payload, len), startWithin, finishWithin);
}
std::shared_ptr<SendFlow> m_video;
std::shared_ptr<SendFlow> m_audio;
std::shared_ptr<SendFlow> m_data;
};
std::shared_ptr<WriteReceipt> basicWrite(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin) override
{
if(0 == streamID)
return m_controlSend->write(TCMessage::message(messageType, timestamp, payload, len), startWithin, finishWithin);
auto &stream = m_netStreams[streamID];
return stream.write(m_controlRecv, streamID, messageType, timestamp, payload, len, startWithin, finishWithin);
}
void wireControlSend()
{
m_controlSend->onException = [this] (uintmax_t reason) { callOnError(); };
m_controlSend->onRecvFlow = [this] (std::shared_ptr<RecvFlow> flow) { acceptOther(flow); };
}
void deliverMessage(uint32_t streamID, const uint8_t *bytes, size_t len)
{
uint8_t messageType = 0;
uint32_t timestamp = 0;
size_t rv = TCMessage::parseHeader(bytes, bytes + len, &messageType, ×tamp);
if(rv and onmessage)
onmessage(streamID, messageType, timestamp, bytes + rv, len - rv);
}
bool shouldAlwaysDeliver(const uint8_t *bytes, size_t len)
{
uint8_t messageType = 0;
size_t rv = TCMessage::parseHeader(bytes, bytes + len, &messageType, nullptr);
if(not rv)
return false;
switch(messageType)
{
case TCMSG_VIDEO: return isVideoSequenceSpecial(bytes + rv, len - rv);
case TCMSG_AUDIO: return isAudioSequenceSpecial(bytes + rv, len - rv);
default: return true;
}
}
void onLateMessage(const uint8_t *bytes, size_t len)
{
uint8_t messageType = 0;
if(not TCMessage::parseHeader(bytes, bytes + len, &messageType, nullptr))
return;
switch(messageType)
{
case TCMSG_VIDEO: m_videoMessagesLate++; break;
case TCMSG_AUDIO: m_audioMessagesLate++; break;
default: break;
}
}
void setOnMessage(const std::shared_ptr<RecvFlow> &flow, uint32_t streamID, const std::shared_ptr<ReorderBuffer> &reorderBuffer)
{
if(reorderBuffer)
{
reorderBuffer->onMessage = [this, streamID] (const uint8_t *bytes, size_t len, uintmax_t sequenceNumber, size_t fragmentCount, bool isLate) {
if((not isLate) or shouldAlwaysDeliver(bytes, len))
deliverMessage(streamID, bytes, len);
else
onLateMessage(bytes, len);
if(isLate and (verbose > 1))
printf("message %lu late, %s\n", (unsigned long)sequenceNumber, shouldAlwaysDeliver(bytes, len) ? "relayed anyway" : "dropped");
};
flow->onCumulativeAckDidMerge = [flow, reorderBuffer] {
reorderBuffer->deliverThrough(flow->getCumulativeAckSequenceNumber());
};
}
flow->onMessage = [this, streamID, flow, reorderBuffer] (const uint8_t *bytes, size_t len, uintmax_t sequenceNumber, size_t fragmentCount) {
uint32_t syncID = 0;
size_t count = 0;
if(FlowSyncManager::parse(bytes, len, syncID, count))
{
m_syncManager.sync(syncID, count, flow);
len = 0; // allow accounting for sequence numbers in reorderBuffer; deliverMessage will drop empty messages
}
if(reorderBuffer)
{
reorderBuffer->insert(bytes, len, sequenceNumber, fragmentCount);
reorderBuffer->deliverThrough(flow->getCumulativeAckSequenceNumber());
}
else
deliverMessage(streamID, bytes, len);
};
}
void acceptOther(const std::shared_ptr<RecvFlow> flow)
{
if(not m_controlRecv)
{
if(not acceptControl(flow))
callOnError();
return;
}
uint32_t streamID = 0;
ReceiveOrder rxOrder = RO_SEQUENCE;
if(not TCMetadata::parse(flow->getMetadata(), &streamID, &rxOrder))
return;
flow->setReceiveOrder(rxOrder);
flow->setBufferCapacity((1<<24) - 1024); // 16MB, big enough for largest TCMessage
std::shared_ptr<ReorderBuffer> reorderBuffer;
if(RO_NETWORK == rxOrder)
reorderBuffer = share_ref(new RunLoopReorderBuffer(&mainRL, reorderWindowPeriod), false);
flow->onComplete = [this, flow, reorderBuffer] (bool error) {
if(reorderBuffer)
reorderBuffer->flush();
m_recvFlows.erase(flow);
checkFinishedLater();
};
setOnMessage(flow, streamID, reorderBuffer);
flow->accept();
m_recvFlows.insert(flow);
}
virtual void checkFinished()
{
if(m_recvFlows.empty() and (not m_open) and (not isFinished()))
callOnShutdownComplete();
}
void checkFinishedLater()
{
auto myself = share_ref(this);
mainRL.doLater([this, myself] { checkFinished(); });
}
FlowSyncManager m_syncManager;
std::shared_ptr<SendFlow> m_controlSend;
std::shared_ptr<RecvFlow> m_controlRecv;
std::set<std::shared_ptr<RecvFlow>> m_recvFlows;
std::map<uint32_t, NetStream> m_netStreams;
};
class RTMFPOutgoingConnection : public RTMFPConnection {
public:
RTMFPOutgoingConnection() : m_platform(&mainRL, &mainPerformer, &workerPerformer)
{
m_platform.onShutdownCompleteCallback = [this] { m_rtmfpShutdownComplete = true; checkFinishedLater(); };
m_crypto.init(false, nullptr);
m_crypto.setHMACSendAlways(requireHMAC);
m_crypto.setHMACRecvRequired(requireHMAC);
m_crypto.setSSeqSendAlways(requireSSEQ);
m_crypto.setSSeqRecvRequired(requireSSEQ);
m_rtmfp = share_ref(new RTMFP(&m_platform, &m_crypto), false);
m_platform.setRtmfp(m_rtmfp.get());
m_rtmfp->setDefaultSessionKeepalivePeriod(10);
m_rtmfp->setDefaultSessionRetransmitLimit(20);
m_rtmfp->setDefaultSessionIdleLimit(120);
}
void shutdown() override
{
RTMFPConnection::shutdown();
m_rtmfp->shutdown(true);
}
protected:
void checkFinished() override
{
if(m_recvFlows.empty() and not m_open)
m_rtmfp->shutdown(false);
if(m_rtmfpShutdownComplete)
RTMFPConnection::checkFinished();
}
std::string findConnectUri(uint32_t streamID, uint8_t messageType, const uint8_t *payload, size_t len)
{
if(overrideRtmfpUri)
return overrideRtmfpUri;
if(len and (0 == streamID) and ((TCMSG_COMMAND == messageType) or (TCMSG_COMMAND_EX == messageType)))
{
const uint8_t *cursor = payload;
const uint8_t *limit = cursor + len;
if((TCMSG_COMMAND_EX == messageType) and (0 != *cursor++)) // COMMAND_EX has a format id, and only format id=0 is defined
goto notfound;
std::vector<std::shared_ptr<AMF0>> args;
if( (not AMF0::decode(cursor, limit, args))
or (args.size() < 3)
or (not args[0]->isString())
or (not args[2]->isObject())
or (0 != strcmp(args[0]->stringValue(), "connect"))
)
goto notfound;
auto tcUrl = args[2]->getValueAtKey("tcUrl");
if(tcUrl and tcUrl->isString())
return tcUrl->stringValue();
}
notfound:
return backupRtmfpUri;
}
void openConnection(const std::string &uri)
{
m_controlSend = m_rtmfp->openFlow(m_crypto.makeEPD(nullptr, uri.c_str(), nullptr), TCMetadata::encode(0, RO_SEQUENCE), PRI_IMMEDIATE);
wireControlSend();
m_platform.addUdpInterface(0, AF_INET);
m_platform.addUdpInterface(0, AF_INET6);
auto myself = share_ref(this);
lookup([this, myself] (const std::vector<Address> &results) {
if(m_open)
{
for(auto it = results.begin(); it != results.end(); it++)
m_controlSend->addCandidateAddress(*it);
}
});
}
std::shared_ptr<WriteReceipt> basicWrite(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin) override
{
if(not m_controlSend)
openConnection(findConnectUri(streamID, messageType, payload, len));
return RTMFPConnection::basicWrite(streamID, messageType, timestamp, payload, len, startWithin, finishWithin);
}
FlashCryptoAdapter_OpenSSL m_crypto;
PerformerPosixPlatformAdapter m_platform;
std::shared_ptr<RTMFP> m_rtmfp;
bool m_rtmfpShutdownComplete { false };
};
class RTWebSocketConnection : public Connection {
public:
RTWebSocketConnection()
{}
bool setFd(int fd)
{
if(m_platformStream)
return false;
m_platformStream = share_ref(new PosixStreamPlatformAdapter(&mainRL), false);
m_wsMessageAdapter = share_ref(new rtws::SimpleWebSocketMessagePlatformAdapter(m_platformStream), false);
int tos = dscp << 2;
setsockopt(fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos));
setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos));
if(not m_platformStream->setSocketFd(fd))
{
::close(fd);
return false;
}
auto myself = share_ref(this);
m_platformStream->onShutdownCompleteCallback = [this, myself] { callOnShutdownComplete(); };
m_websock = share_ref(new SimpleWebSocket_OpenSSL(m_platformStream), false);
m_wsMessageAdapter->init(m_websock);
m_rtws = share_ref(new rtws::RTWebSocket(m_wsMessageAdapter), false);
m_wsMessageAdapter->onOpen = [this, myself] {
if(verbose) printf("RTWebSocketConnection %p WebSocket message adapter: onOpen\n", (void *)this);
m_rtws->init();
};
m_rtws->onRecvFlow = [this] (std::shared_ptr<rtws::RecvFlow> flow) { acceptControl(flow); };
m_rtws->onError = [this, myself] { callOnError(); };
m_rtws->minOutstandingThresh = 1024 * 16; // default 64KB probably too big
m_rtws->maxAdditionalDelay = (delaycc_delay < INFINITY) ? delaycc_delay : 120.0;
return true;
}
void acceptControl(std::shared_ptr<rtws::RecvFlow> flow)
{
uint32_t streamID = 0;
if(m_controlRecv or (not TCMetadata::parse(flow->getMetadata(), &streamID, nullptr)) or (0 != streamID))
return;
m_controlRecv = flow;
flow->onComplete = [this] { callOnError(); };
flow->accept();
setOnMessage(flow, streamID);
m_controlSend = flow->openReturnFlow(TCMetadata::encode(0, RO_SEQUENCE), PRI_IMMEDIATE);
m_controlSend->onException = [this] (uintmax_t reason, const std::string &description) { callOnError(); };
m_controlSend->onRecvFlow = [this] (std::shared_ptr<rtws::RecvFlow> flow) { acceptOther(flow); };
if(verbose) printf("RTWebSocketConnection %p accept control flow\n", (void *)this);
}
void close() override
{
Connection::close();
if(m_controlSend)
m_controlSend->close();
m_netStreams.clear();
if(m_rtws)
m_rtws->close();
if(m_platformStream)
m_platformStream->close();
}
void shutdown() override
{
close();
}
protected:
struct NetStream {
~NetStream()
{
if(m_video) m_video->close();
if(m_audio) m_audio->close();
if(m_data) m_data->close();
}
rtws::SendFlow * openFlowForType(const std::shared_ptr<rtws::RecvFlow> &control, uint32_t streamID, uint8_t messageType)
{
Priority pri = PRI_IMMEDIATE;
std::shared_ptr<rtws::SendFlow> *flowRef = &m_data;
if(TCMSG_VIDEO == messageType)
{
flowRef = &m_video;
if(not interleave)
pri = PRI_PRIORITY;
}
else if(TCMSG_AUDIO == messageType)
flowRef = &m_audio;
if(not *flowRef)
{
*flowRef = control->openReturnFlow(TCMetadata::encode(streamID, RO_SEQUENCE), pri);
if(interleave)
m_video = m_audio = m_data = *flowRef;
}
return flowRef->get();
}
std::shared_ptr<WriteReceipt> write(const std::shared_ptr<rtws::RecvFlow> &control, uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin)
{
auto flow = openFlowForType(control, streamID, messageType);
if(not flow)
return nullptr;
return flow->write(TCMessage::message(messageType, timestamp, payload, len), startWithin, finishWithin);
}
std::shared_ptr<rtws::SendFlow> m_video;
std::shared_ptr<rtws::SendFlow> m_audio;
std::shared_ptr<rtws::SendFlow> m_data;
};
std::shared_ptr<WriteReceipt> basicWrite(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len, Time startWithin, Time finishWithin) override
{
if(0 == streamID)
return m_controlSend->write(TCMessage::message(messageType, timestamp, payload, len), startWithin, finishWithin);
auto &stream = m_netStreams[streamID];
return stream.write(m_controlRecv, streamID, messageType, timestamp, payload, len, startWithin, finishWithin);
}
void setOnMessage(std::shared_ptr<rtws::RecvFlow> flow, uint32_t streamID)
{
flow->onMessage = [this, streamID] (const uint8_t *bytes, size_t len, uintmax_t messageNumber) {
uint32_t syncID = 0;
size_t count = 0;
if(FlowSyncManager::parse(bytes, len, syncID, count))
return; // TODO make a FlowSyncManager for RTWS. don't relay flow sync messages.
uint8_t messageType = 0;
uint32_t timestamp = 0;
size_t rv = TCMessage::parseHeader(bytes, bytes + len, &messageType, ×tamp);
if(rv and onmessage)
onmessage(streamID, messageType, timestamp, bytes + rv, len - rv);
};
}
void acceptOther(std::shared_ptr<rtws::RecvFlow> flow)
{
if(not m_open)
return;
uint32_t streamID = 0;
if(not TCMetadata::parse(flow->getMetadata(), &streamID, nullptr))
return;
flow->setBufferCapacity((1<<24) - 1);
flow->onComplete = [this, flow] {
m_recvFlows.erase(flow);
};
setOnMessage(flow, streamID);
flow->accept();
m_recvFlows.insert(flow);
}
std::shared_ptr<rtws::SendFlow> m_controlSend;
std::shared_ptr<rtws::RecvFlow> m_controlRecv;
std::set<std::shared_ptr<rtws::RecvFlow>> m_recvFlows;
std::map<uint32_t, NetStream> m_netStreams;
std::shared_ptr<rtws::RTWebSocket> m_rtws;
std::shared_ptr<SimpleWebSocket> m_websock;
std::shared_ptr<rtws::SimpleWebSocketMessagePlatformAdapter> m_wsMessageAdapter;
std::shared_ptr<PosixStreamPlatformAdapter> m_platformStream;
};
class Client : public Object {
public:
~Client()
{
if(verbose > 1) printf("~Client %p\n", (void *)this);
}