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OMXPlayerSync.cpp
325 lines (285 loc) · 7.55 KB
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OMXPlayerSync.cpp
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#include "OMXPlayerSync.h"
OMXPlayerSync::OMXPlayerSync( SyncType _syncType, int _numNodes, int _port )
{
jitter = 0;
syncType = _syncType;
syncTimeState = ONTRACK;
numNodes = _numNodes;
port = _port;
reply = strdup ( "0" ); // Can be anything at start
updateTicker = 2 * UPDATE_THRESHOLD; // want to force an update on the first try
}
OMXPlayerSync::OMXPlayerSync( SyncType _syncType, int _port, const string &_serverAddress )
{
jitter = 0;
syncType = _syncType;
syncTimeState = ONTRACK;
port = _port;
serverAddress = _serverAddress;
question = strdup ( "1" ); // Can be anything
updateTicker = 2 * UPDATE_THRESHOLD; // want to force an update on the first try
}
OMXPlayerSync::~OMXPlayerSync()
{
closeConnection ();
}
void OMXPlayerSync::update ()
{
if ( updateTicker >= UPDATE_THRESHOLD )
{
syncWithServer ();
if ( syncType == SYNC_CLIENT )
{
updateJitter ();
updateSpeed ();
}
updateTicker = 0;
displayVerbose ();
}
else
{
updateTicker++;
}
}
void OMXPlayerSync::updateJitter ()
{
if ( clientTime > serverTime + JITTER_TOLERANCE )
{
syncTimeState = AHEAD;
jitter -= JITTER_DELTA;
}
else if ( clientTime < serverTime - JITTER_TOLERANCE )
{
syncTimeState = BEHIND;
jitter += JITTER_DELTA;
}
else
{
syncTimeState = ONTRACK;
jitter = 0;
}
}
void OMXPlayerSync::setPort ( int _port )
{
port = _port;
}
void OMXPlayerSync::updateSpeed ()
{
if ( syncTimeState != ONTRACK )
{
SetSpeed(playspeeds[playspeed_current] + jitter);
}
}
float OMXPlayerSync::getJitter ()
{
return jitter;
}
int OMXPlayerSync::syncWithServer ()
{
int i;
if ( syncType == SYNC_SERVER )
{
serverTime = stamp;
//First receive the tcp messages
for ( i = 0; i < numNodes && i < MAX_NUM_CLIENT_SOCKETS; i++)
{
bytesreceived = recv(clientSocket [ i ], buff, BUFFLEN, 0);
if (-1 == bytesreceived) {
perror("0:recv");
return 1;
}
}
sprintf ( reply, "%f", serverTime );
//then rapidly send a message back
for ( i = 0; i < numNodes && i < MAX_NUM_CLIENT_SOCKETS; i++)
{
if (-1 == send(clientSocket [ i ], reply, (size_t) strlen(reply) + 1, 0))
{
perror("0:send parent");
return 1;
}
}
}
else
{
clientTime = stamp;
if (-1 == send(sockfd, question, (size_t) strlen(question) + 1, 0)) {
perror("1:send");
return 1;
}
bytesreceived = recv(sockfd, buff, BUFFLEN, 0);
if (-1 == bytesreceived) {
perror("1:recv");
return 1;
}
serverTime = atof ( buff );
}
return 0;
}
int OMXPlayerSync::setUpConnection ()
{
int i;
if ( syncType == SYNC_SERVER )
{
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (-1 == sockfd) {
perror("0:socket");
return 1;
}
if (-1 == setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &forceRebind, sizeof(int))) {
perror("0:setsockopt");
return 1;
}
memset((void *) &server, 0, sizeof(struct sockaddr_in));
server.sin_family = AF_INET;
server.sin_port = htons( port );
server.sin_addr.s_addr = INADDR_ANY;
if (-1 == bind(sockfd, (const struct sockaddr *) &server,
sizeof(struct sockaddr_in))) {
perror("0:bind");
return 1;
}
if (-1 == listen(sockfd, 0)) {
perror("0:listen");
return 1;
}
// Set up the client sockets
for ( i = 0; i < numNodes && i < MAX_NUM_CLIENT_SOCKETS; i++)
{
clientSocket [ i ] = accept(sockfd, (struct sockaddr *) &client, &clientaddrlen);
if (-1 == clientSocket [ i ]) {
perror("0:accept");
return 1;
}
}
return 0;
}
else
{
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (-1 == sockfd) {
perror("1:socket");
return 1;
}
if (0 != getaddrinfo(serverAddress.c_str (), NULL, NULL, &serverinfo)) {
perror("getaddrinfo");
return 1;
}
/*Copy size of sockaddr_in b/c res->ai_addr to big for this example*/
memcpy(&server, serverinfo->ai_addr, sizeof(struct sockaddr_in));
server.sin_family = AF_INET;
server.sin_port = htons( port );
freeaddrinfo(serverinfo);
#ifdef LOOP_UNTIL_CONNECT
while ( true )
{
if (-1 != connect(sockfd, (const struct sockaddr *) &server,
sizeof(struct sockaddr_in))) {
break;
}
usleep ( CONNECT_SLEEP_PERIOD );
}
#else
if (-1 == connect(sockfd, (const struct sockaddr *) &server,
sizeof(struct sockaddr_in))) {
perror("1:connect");
return 1;
}
#endif // LOOP_UNTIL_CONNECT
return 0;
}
}
int OMXPlayerSync::closeConnection ()
{
int i;
if ( syncType == SYNC_SERVER )
{
// Close here to speed up previous stage
for ( i = 0; i < numNodes && i < MAX_NUM_CLIENT_SOCKETS; i++)
{
if (-1 == close(clientSocket [ i ])) {
perror("0:close(clientSocket)");
return 1;
}
}
if (-1 == close(sockfd)) {
perror("0:close(sockfd)");
return 1;
}
return 0;
}
else
{
close(sockfd);
return 0;
}
}
/* Forks a process to run in background and *
* 1) Listen for server broadcasting its play time *
* 2) Listen for clients indicating that they are ready to run *
*/
void OMXPlayerSync::start ()
{
// Pause movie, unpause later via tcp communication
pauseMovie ();
setUpConnection ();
syncWithServer ();
unpauseMovie ();
displayVerbose ();
}
/*
* Initally we pause the movie then resume when all nodes are ready. *
* Note, we never call this function more than once, hence why we *
* don't need to include the jitter yet. *
*/
void OMXPlayerSync::pauseMovie ()
{
playspeed_current = playspeed_slow_min;
SetSpeed(playspeeds[playspeed_current]);
}
/*
* Server waits until all nodes are ready then broadcasts a start *
* signal. This is meant to only be used once. *
*/
void OMXPlayerSync::unpauseMovie ()
{
playspeed_current = playspeed_normal;
SetSpeed(playspeeds[playspeed_current] + jitter);
}
void OMXPlayerSync::display ()
{
if ( m_is_sync_verbose )
{
if ( syncType == SYNC_SERVER )
{
printf ( "Sync Type: SYNC_SERVER\n" );
printf ( "Jitter: %f\n", jitter );
printf ( "Num Nodes: %d\n", numNodes );
printf ( "Port: %d\n", port );
cout << "Server Time: " << serverTime << "\n";
}
else
{
printf ( "Sync Type: SYNC_CLIENT\n" );
printf ( "Jitter: %f\n", jitter );
printf ( "Port: %d\n", port );
cout << "Server Address: " << serverAddress << "\n";
cout << "Server Time: " << serverTime << "\n";
}
}
}
void OMXPlayerSync::displayVerbose ()
{
if ( m_is_sync_verbose )
{
cout.precision (15);
if ( syncType == SYNC_SERVER )
{
cout << "[" << updateTicker << "] Server Time: " << serverTime << "\n";
}
else
{
cout << "[" << updateTicker << "] Server Time: " << serverTime << " local time: " << clientTime << " Jitter:" << jitter << "\n";
}
}
}