txtcam.m

#import <Foundation/Foundation.h>
#import <Cocoa/Cocoa.h>
#import <QTKit/QTKit.h>

#include <stdio.h>
#include <sys/ioctl.h>
#include <math.h>
#include <signal.h>

@interface myThread:NSThread {
}
@end

@implementation myThread:NSThread

- (void)captureOutput:(QTCaptureOutput *)captureOutput didOutputVideoFrame:(CVImageBufferRef)videoFrame withSampleBuffer:(QTSampleBuffer *)sampleBuffer fromConnection:(QTCaptureConnection *)connection {
  @synchronized (self) {
    CIImage* image = [CIImage imageWithCVImageBuffer:videoFrame];
    CGSize size = image.extent.size;
    NSBitmapImageRep *rep = [[NSBitmapImageRep alloc] initWithCIImage: image];

    int x;
    int y;
    float bg;
    float fg;
    float tmp;
    float mod;
    char* chr;

    printf("\033[0;0H"); // Move cursor to top right
    for (y=0; y<size.height; y += 1) {
      for (x=0; x<size.width; x++) {
        CGFloat b = [[rep colorAtX:x y:y] brightnessComponent];

        bg = (b * 23 + 232);
        fg = fmin(255, bg+1);
        mod = fmodf(bg, 1.0);

        if (mod < 0.2) {
          chr = " ";
        } else if (mod < 0.4) {
          chr = "░";
        } else if (mod < 0.6) {
          chr = "▒";
        } else if (mod < 0.8) {
          tmp = bg; bg = fg; fg = tmp;
          chr = "▒";
        } else {
          tmp = bg; bg = fg; fg = tmp;
          chr = "░";
        }

        printf("\033[48;5;%im\033[38;5;%im%s", (int)bg, (int)fg, chr);
      }
      if (y<size.height-1) printf("\n");
    }
  }

}

- (void)main {
  struct winsize max;
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

  NSArray *a = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
  QTCaptureDevice *cam = [a objectAtIndex:0];
  NSError *err;
  if ([cam open:&err] != YES) {
    NSLog(@"Error opening camera: %@", err);
  }
  QTCaptureDeviceInput *in = [[QTCaptureDeviceInput alloc] initWithDevice:cam];
  QTCaptureSession *session = [[QTCaptureSession alloc] init];
  if ([session addInput:in error:&err] != YES) {
    NSLog(@"Error adding input to capture session: %@", err);
  }
  // Grab decompressed output
  QTCaptureVideoPreviewOutput *previewOutput;
  previewOutput = [[QTCaptureVideoPreviewOutput alloc] init];
  [previewOutput setPixelBufferAttributes: [NSDictionary dictionaryWithObjectsAndKeys:
    [NSNumber numberWithInt:64], (id)kCVPixelBufferWidthKey,
    [NSNumber numberWithInt:48/2], (id)kCVPixelBufferHeightKey,
    nil]];

  [previewOutput setDelegate:self];
  int success = [session addOutput:previewOutput error:&err];
  if (!success) {
    NSLog(@"Error adding preview output to capture session: %@", err);
    exit(1);
  }

  printf("\033[2J"); // clear screen
  printf( "\x1B[?25l"); // disable cursor
  [session startRunning];

  while(1) {
    sleep(1);

    // Update preview size based on size of terminal
    ioctl(0, TIOCGWINSZ , &max);
    [previewOutput setPixelBufferAttributes: [NSDictionary dictionaryWithObjectsAndKeys:
      [NSNumber numberWithInt:max.ws_col], (id)kCVPixelBufferWidthKey,
      [NSNumber numberWithInt:max.ws_row], (id)kCVPixelBufferHeightKey,
      nil]];

    sleep(1);
  }
  [pool release];
}

@end

void intHandler() {
  printf("\033[0;0H"); // Move cursor to top right
  printf("\033[2J"); // clear screen
  printf("\x1B[?25h"); // re-enable cursor
  exit(1);
}


int main( int argc, const char* argv[])
{
  signal(SIGINT, intHandler);
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  [NSApplication sharedApplication];
  [[[myThread alloc] init] start];
  [NSApp run];
  [pool release];
  return 0;
}