examples/tutorials/xcode iOS/Tutorial 3/ViewController.m

   1 #import "ViewController.h"
   2 #import "GStreamerBackend.h"
   3 #import <UIKit/UIKit.h>
   4
   5 @interface ViewController () {
   6     GStreamerBackend *gst_backend;
   7     int media_width;
   8     int media_height;
   9 }
  10
  11 @end
  12
  13 @implementation ViewController
  14
  15 /*
  16  * Methods from UIViewController
  17  */
  18
  19 - (void)viewDidLoad
  20 {
  21     [super viewDidLoad];
  22
  23     play_button.enabled = FALSE;
  24     pause_button.enabled = FALSE;
  25
  26     /* Make these constant for now, later tutorials will change them */
  27     media_width = 320;
  28     media_height = 240;
  29
  30     gst_backend = [[GStreamerBackend alloc] init:self videoView:video_view];
  31 }
  32
  33 - (void)didReceiveMemoryWarning
  34 {
  35     [super didReceiveMemoryWarning];
  36     // Dispose of any resources that can be recreated.
  37 }
  38
  39 /* Called when the Play button is pressed */
  40 -(IBAction) play:(id)sender
  41 {
  42     [gst_backend play];
  43 }
  44
  45 /* Called when the Pause button is pressed */
  46 -(IBAction) pause:(id)sender
  47 {
  48     [gst_backend pause];
  49 }
  50
  51 - (void)viewDidLayoutSubviews
  52 {
  53     CGFloat view_width = video_container_view.bounds.size.width;
  54     CGFloat view_height = video_container_view.bounds.size.height;
  55
  56     CGFloat correct_height = view_width * media_height / media_width;
  57     CGFloat correct_width = view_height * media_width / media_height;
  58
  59     if (correct_height < view_height) {
  60         video_height_constraint.constant = correct_height;
  61         video_width_constraint.constant = view_width;
  62     } else {
  63         video_width_constraint.constant = correct_width;
  64         video_height_constraint.constant = view_height;
  65     }
  66 }
  67
  68 /*
  69  * Methods from GstreamerBackendDelegate
  70  */
  71
  72 -(void) gstreamerInitialized
  73 {
  74     dispatch_async(dispatch_get_main_queue(), ^{
  75         play_button.enabled = TRUE;
  76         pause_button.enabled = TRUE;
  77         message_label.text = @"Ready";
  78     });
  79 }
  80
  81 -(void) gstreamerSetUIMessage:(NSString *)message
  82 {
  83     dispatch_async(dispatch_get_main_queue(), ^{
  84         message_label.text = message;
  85     });
  86 }
  87
  88 @end