avvideowall/AVVideoWall+TerminalIO.m
/* |
File: AVVideoWall+TerminalIO.m |
Abstract: An AVVideoWall category, responsible for setting up terminal I/O for the command line application |
Version: 1.1 |
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*/ |
#import "AVVideoWall+TerminalIO.h" |
#include <termios.h> |
@implementation AVVideoWall (TerminalIO) |
struct termios termsettings_orig; |
struct termios termsettings_cbreak; |
static void restoreTermIOState(void) |
{ |
tcsetattr(0, TCSANOW, &termsettings_orig); |
} |
static void signalHandler(int sig) |
{ |
restoreTermIOState(); |
} |
- (BOOL)run |
{ |
__block BOOL quit = NO; |
dispatch_queue_t keyboardInputQueue = dispatch_queue_create("keyboard input queue", DISPATCH_QUEUE_SERIAL); |
// Start running the capture session |
[_session startRunning]; |
dispatch_async(keyboardInputQueue, ^(void) { |
atexit(restoreTermIOState); |
signal(SIGHUP, signalHandler); |
signal(SIGINT, signalHandler); |
// stash current termios state, switch to cbreak mode |
tcgetattr(0, &termsettings_orig); |
termsettings_cbreak = termsettings_orig; |
termsettings_cbreak.c_lflag &= ~(ICANON | ECHO); // non-canonical mode, disable echo |
termsettings_cbreak.c_cc[VTIME] = 0; // tenths of seconds between bytes |
termsettings_cbreak.c_cc[VMIN] = 1; // num of chars received before returning |
tcsetattr(0, TCSANOW, &termsettings_cbreak); |
while ( !quit ) { |
int curChar = getchar(); |
switch (curChar) { |
case ' ': |
// If the layers are flying around |
if ( _spinningLayers ) { |
dispatch_async(dispatch_get_main_queue(), ^(void) { |
_spinningLayers = NO; |
// Reset the layers |
[self sendLayersHome]; |
}); |
} |
// If the layers are at their initial positions |
else { |
dispatch_async(dispatch_get_main_queue(), ^(void) { |
_spinningLayers = YES; |
// Spin the layers |
[self spinLayers]; |
}); |
} |
break; |
case 'q': |
case 'Q': |
quit = YES; |
break; |
default: |
break; |
} |
} |
}); |
while ( !quit ) { |
NSDate* halfASecondFromNow = [[NSDate alloc] initWithTimeIntervalSinceNow:.5]; |
[[NSRunLoop currentRunLoop] runUntilDate:halfASecondFromNow]; |
[halfASecondFromNow release]; |
halfASecondFromNow = nil; |
} |
NSLog(@"Quitting"); |
// Stop running the capture session |
[_session stopRunning]; |
dispatch_release(keyboardInputQueue); |
return YES; |
} |
@end |
Copyright © 2011 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2011-08-25