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syndilights/frameserver/Server.cpp

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C++
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#include "Server.h"
Server::Server(int _port )
{
port = _port;
displaycounter = 0;
packetcounter = 0;
consoleinit = false;
mode = FRAME;
//test();
}
Server::~Server()
{
Glib::Mutex::Lock lock(mutex_);
int size = buffers.size();
for(int i = 0; i < size; i++)
delete buffers[i];
}
void Server::launch_threads()
{
threads.push_back( Glib::Thread::create( sigc::mem_fun(this, &Server::listen), false ) );
threads.push_back( Glib::Thread::create( sigc::mem_fun(this, &Server::mix), false ) );
threads.push_back( Glib::Thread::create( sigc::mem_fun(this, &Server::console), false) );
threads.push_back( Glib::Thread::create( sigc::mem_fun(this, &Server::expire), false) );
}
/* this listens for UDP connections on a port and waits until there is data,
processes it and repeats */
/* TODO
error and format checking
clean exit conditions
ability for one client to take over the display
*/
void Server::listen()
{
try
{
boost::asio::io_service io_service;
// next line is NOT thread-safe because we're accessing "port" without lock
// however, it is done only once before any other threads are started and
// should be safe
udp::socket socket(io_service, udp::endpoint(udp::v4(), port));
//cout << "listening" << endl;
frame_t frame;
while (1)
{
// creating the buffer each time is faster than zeroing it out
boost::array<unsigned char, BUFLEN> recv_buf;
udp::endpoint remote_endpoint;
boost::system::error_code error;
socket.receive_from(boost::asio::buffer(recv_buf),
remote_endpoint, 0, error);
// bufnum is used further down
/* the buffer is locked for a long long time, however, we need
to make sure that none of the buffers expires while we're about
to write to it */
{
Glib::Mutex::Lock lock(mutex_);
int size = buffers.size();
time(&currenttime);
int bufnum = 0;
bool known = false;
for(bufnum = 0; bufnum < size; bufnum++)
{
// have we encountered this source before?
if(endpoints[bufnum] == remote_endpoint)
{
known = true;
break;
}
}
if( !known && size < NUMBUFS )
{
// create a new buffer make a note of the endpoint
std::stringstream endpointstring;
endpointstring << remote_endpoint;
//cout << "adding new buffer for " << remote_endpoint << endl;
buffers.push_back( new Buffer( endpointstring.str() ) );
endpoints.push_back( remote_endpoint );
times.push_back( currenttime );
}
// discard packet, we're not accepting any more sources!
else if( !known && size >= NUMBUFS )
{
//cout << "no more buffers left! " << bufnum << endl;
continue;
}
packetcounter++;
// copy frame information into the buffer
frame.z = recv_buf[0];
for(int i = 0; i < HEIGHT; i++)
{
for(int j = 0; j < WIDTH; j++)
{
for(int a = 0; a < CHANNELS; a++)
{
frame.windows[i][j][a] = recv_buf[HEADEROFFSET+ i*(CHANNELS*WIDTH+1) + j*CHANNELS + a];
//cout << int( recv_buf[HEADEROFFSET+ i*(CHANNELS*WIDTH+1) + j*CHANNELS + a] ) << endl;
}
}
}
for(int w = 0; w < SEGWIDTH; w++ )
{
for(int n = 0;n < SEGNUM; n++)
{
for(int a = 0; a < SEGCHANNELS; a++)
{
frame.segments[w][n][a] = recv_buf[HEADEROFFSET+WINDOWOFFSET+ w*(SEGCHANNELS*SEGNUM+1) + n*SEGCHANNELS + a];
}
}
}
// be extra certain that we're not writing into wild memory
if( bufnum < buffers.size() )
{
buffers[ bufnum ]->set(frame);
// this is accurate enough for the purpose of expiring unused buffers
times[bufnum] = currenttime;
}
} // lock is released here because the block ends
if (error && error != boost::asio::error::message_size)
throw boost::system::system_error(error);
std::string message = "received";
boost::system::error_code ignored_error;
// we can provide feedback to clients
//socket.send_to(boost::asio::buffer(message),
// remote_endpoint, 0, ignored_error);
}
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
/* the framemixer, this periodically (40 times a second) reads all input
buffers and then produces output, ready to be displayed.
In the final version, this is where interesting things will happen.
*/
void Server::mix()
{
int size = 0;
int counter = 0;
int pixel = 0;
while(1)
{
frame_t temp_frame;
float temp_alpha;
// we lock the buffers for a long time, but we need to make sure
// that none of the buffers is allowed to expire while we're working on it!
{
Glib::Mutex::Lock lock(mutex_);
displaycounter++;
size = buffers.size();
// zero out the frame
for(int i = 0; i < HEIGHT; i++)
{
for(int j = 0; j < WIDTH; j++)
{
for(int a = 0; a < CHANNELS; a++)
{
frame.windows[i][j][a] = 0;
}
}
}
for(int w = 0; w < SEGWIDTH; w++ )
{
for(int n = 0;n < SEGNUM; n++)
{
for(int a = 0; a < SEGCHANNELS; a++)
{
frame.segments[w][n][a] = 0;
}
}
} // zero out frame
// implement alpha blending
for(int x = 0; x < size; x++)
{
temp_frame = buffers[x]->get();
for(int i = 0; i < HEIGHT; i++)
{
for(int j = 0; j < WIDTH; j++)
{
temp_alpha = (float)temp_frame.windows[i][j][CHANNELS-1]/255;
for(int a = 0; a < CHANNELS; a++)
{
// this works for the colors and for the alpha channel
pixel = (1-temp_alpha)*frame.windows[i][j][a] + temp_alpha*temp_frame.windows[i][j][a];
//make sure we don't do anything silly
if( pixel >= 255 )
frame.windows[i][j][a] = 255;
else if( pixel <= 0 )
frame.windows[i][j][a] = 0;
else
frame.windows[i][j][a] = pixel;
}
}
}
for(int w = 0; w < SEGWIDTH; w++ )
{
for(int n = 0;n < SEGNUM; n++)
{
temp_alpha = (float)temp_frame.segments[w][n][SEGCHANNELS-1]/255;
for(int a = 0; a < SEGCHANNELS; a++)
{
// this works for the colors and for the alpha channel
pixel = (1-temp_alpha)*frame.segments[w][n][a] + temp_alpha*temp_frame.segments[w][n][a];
// make sure we don't make silly mistakes
if( pixel >= 255 )
frame.segments[w][n][a] = 255;
else if( pixel <= 0 )
frame.segments[w][n][a] = 0;
else
frame.segments[w][n][a] = pixel;
}
}
}
}
// temp frame has validity in the loop only so it can be safely used without locking the whole object
// we do this in case output() takes a long time to return. If it read frame directly, we'd end up
// waiting for a long time
temp_frame = frame;
} // release lock and send off to hardware
output(temp_frame);
}
}
// output to hardware using OLA
void Server::output(frame_t _frame)
{
// pretend we're doing something
usleep( 25000 );
}
void Server::console()
{
initscr();
keypad(stdscr,TRUE);
cbreak();
noecho();
start_color();
init_pair(1,COLOR_RED,COLOR_BLACK);
init_pair(2,COLOR_GREEN,COLOR_BLACK);
init_pair(3,COLOR_BLUE,COLOR_BLACK);
{
Glib::Mutex::Lock lock(mutex_);
consoleinit = true;
threads.push_back( Glib::Thread::create( sigc::mem_fun(this, &Server::input), false) );
}
while(1)
{
{
// we'll be accessing some data to provide statistics, lock the Server
Glib::Mutex::Lock lock(mutex_);
mvprintw(0,0,"Clients %d | F2 Frame | F3 Values | F4 Clients | F5 Stats | input: %d ", buffers.size(),console_input );
switch(mode)
{
case FRAME:
console_printframe(frame);
break;
case FRAME_VALUES:
console_printframe_values(frame);
break;
case CLIENTS:
console_printclients();
break;
default:
console_printframe(frame);
}
refresh(); /* Print it on to the real screen */
}
usleep( 20000 );
}
endwin(); /* End curses mode */
}
void Server::input()
{
int c;
while(consoleinit)
{
// getch will wait for input, so loop will not lock up cpu
c = getch();
// now we need to lock data structure because we're going to use shared objects
{
switch(c)
{
case KEY_F(2):
mode = FRAME;
clear();
break;
case KEY_F(3):
mode = FRAME_VALUES;
clear();
break;
case KEY_F(4):
mode = CLIENTS;
clear();
break;
case '0':
default:
{
Glib::Mutex::Lock lock(mutex_);
console_input = c;
}
}
}
}
}
/* the console functions should only be used in the console thread, they don't
* implement their own locking and they need ncurses to be initialised */
void Server::console_printframe(frame_t _frame)
{
int x1,y1,x2,y2;
// output the current screen contents
for(int i = 0; i < HEIGHT; i++)
{
for(int j = 0; j < WIDTH; j++)
{
mvprintw(i+2,j,"%c", brtoc(_frame.windows[i][j][0]) );
}
}
for(int w = 0; w < SEGWIDTH; w++)
{
for(int n = 0; n < SEGNUM; n++)
{
// the segments of a display are numbered from bottom to top
// in a clockwise manner (6'o clock = 0)
switch(n)
{
case 0:
x1 = 2;
x2 = 3;
y1 = 7;
y2 = 7;
break;
case 1:
x1 = 0;
x2 = 0;
y1 = 5;
y2 = 6;
break;
case 2:
x1 = 2;
x2 = 3;
y1 = 4;
y2 = 4;
break;
case 3:
x1 = 0;
x2 = 0;
y1 = 2;
y2 = 3;
break;
case 4:
x1 = 2;
x2 = 3;
y1 = 1;
y2 = 1;
break;
case 5:
x1 = 4;
x2 = 4;
y1 = 2;
y2 = 3;
break;
case 6:
x1 = 4;
x2 = 4;
y1 = 5;
y2 = 6;
break;
case 7:
x1 = 5;
x2 = 5;
y1 = 7;
y2 = 7;
break;
} // switch
for(int a = 0; a < SEGCHANNELS-1; a++)
{
attron(COLOR_PAIR(a+1));
mvprintw( HEIGHT+2+a*8+y1,
w*7+x1,
"%c",brtoc(_frame.segments[w][n][a]));
mvprintw( HEIGHT+2+a*8+y2,
w*7+x2,
"%c",brtoc(_frame.segments[w][n][a]));
attroff(COLOR_PAIR(a+1));
}
}
}
}
void Server::console_printframe_values(frame_t _frame)
{
// output the current screen contents
for(int i = 0; i < HEIGHT; i++)
{
for(int j = 0; j < WIDTH; j++)
{
mvprintw(i*2+2,j*4," %d ", brtoi(_frame.windows[i][j][0]) );
}
}
}
// print the list of clients connected to the server
void Server::console_printclients()
{
int rows, cols, offset=0;
getmaxyx(stdscr,rows,cols);
clrtobot();
for(int i = 0; i < buffers.size(); i++)
{
// rows-2 because there is a header
if(i > 0 && i%(rows-2)==0)
offset += 27;
if( offset + 27 < cols )
mvprintw(i%(rows-2)+2,offset,"(%3d) %s\n", i,buffers[i]->get_id().c_str() );
}
}
void Server::console_printstats()
{
}
int Server::get_size()
{
Glib::Mutex::Lock lock(mutex_);
return buffers.size();
}
/* this expires buffers if they haven't been updated in a long time,
* therefore allowing a new source to be added */
void Server::expire()
{
while(1)
{
{
Glib::Mutex::Lock lock(mutex_);
time(&currenttime);
for(int i = 0; i < buffers.size(); i++)
{
if( difftime( currenttime, times[i] ) > BUFTIMEOUT )
{
//cout << "buffer " << i << " will now expire\n";
delete buffers[i];
buffers.erase(buffers.begin()+i);
times.erase(times.begin()+i);
endpoints.erase(endpoints.begin()+i);
// element i has been erased, i-- is required
i--;
}
}
}
usleep( 1000000 );
}
}
int Server::brtoi(unsigned char br)
{
return (int)br;
}
// converts a given brightness value (0-255) to a character
// relatively efficiently
char Server::brtoc(unsigned char br)
{
static char chars[11] = " ._-~:+*#@";
if(br > 124)
{
if( br > 202 )
{
if( br > 228 )
return chars[9];
else
return chars[8];
}
else
{
if( br > 176 )
return chars[7];
else
return chars[6];
}
}
else
{
if( br > 72 )
{
if( br > 124 )
return chars[5];
if( br > 98 )
return chars[4];
else
return chars[3];
}
else
{
if( br > 46 )
return chars[2];
if( br > 20 )
return chars[1];
else
return chars[0];
}
}
}
// implementation dependent behaviour of unsigned char?!
void Server::test()
{
char i = 0;
unsigned char j = 0;
while(1)
{
cout << int(i) << endl;
cout << int(j) << endl;
i--;
j = i;
usleep(20000);
}
}
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