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Large revamp to bring it closer to the Android tutorial 2.

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This commit is contained in:
Xavi Artigas 2013-05-06 16:49:03 +02:00
parent 1e071cd730
commit c27858631d
7 changed files with 218 additions and 151 deletions
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7
gst-sdk/tutorials/xcode iOS/Tutorial 2/GStreamerBackend.h
View file

@ -3,12 +3,7 @@
@interface GStreamerBackend : NSObject
@property (nonatomic,assign) id delegate;
-(NSString*) getGStreamerVersion;
-(BOOL) initializePipeline;
-(id) init:(id) uiDelegate;
-(void) play;
-(void) pause;
-(void) stop;

172
gst-sdk/tutorials/xcode iOS/Tutorial 2/GStreamerBackend.m
View file

@ -3,16 +3,33 @@
#include <gst/gst.h>
@interface GStreamerBackend()
-(void)notifyError:(gchar*) message;
-(void)notifyEos;
-(void) _poll_gst_bus;
-(void)setUIMessage:(gchar*) message;
-(void)app_function;
-(void)check_initialization_complete;
@end
@implementation GStreamerBackend {
GstElement *pipeline;
id delegate; /* Class that we use to interact with the user interface */
GstElement *pipeline; /* The running pipeline */
GMainContext *context; /* GLib context used to run the main loop */
GMainLoop *main_loop; /* GLib main loop */
gboolean initialized; /* To avoid informing the UI multiple times about the initialization */
}
@synthesize delegate;
-(id) init:(id) uiDelegate
{
if (self = [super init])
{
self->delegate = uiDelegate;
/* Start the bus monitoring task */
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self app_function];
});
}
return self;
}
-(void) dealloc
{
@ -23,95 +40,120 @@
}
}
-(void)notifyError:(gchar*) message
-(void)setUIMessage:(gchar*) message
{
NSString *string = [NSString stringWithUTF8String:message];
if(delegate && [delegate respondsToSelector:@selector(gstreamerError:from:)])
if(delegate && [delegate respondsToSelector:@selector(gstreamerSetUIMessage:)])
{
[delegate gstreamerError:string from:self];
[delegate gstreamerSetUIMessage:string];
}
}
-(void)notifyEos
/* Retrieve errors from the bus and show them on the UI */
static void error_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
{
if(delegate && [delegate respondsToSelector:@selector(gstreamerEosFrom)])
{
[delegate gstreamerEosFrom:self];
GError *err;
gchar *debug_info;
gchar *message_string;
gst_message_parse_error (msg, &err, &debug_info);
message_string = g_strdup_printf ("Error received from element %s: %s", GST_OBJECT_NAME (msg->src), err->message);
g_clear_error (&err);
g_free (debug_info);
[self setUIMessage:message_string];
g_free (message_string);
gst_element_set_state (self->pipeline, GST_STATE_NULL);
}
/* Notify UI about pipeline state changes */
static void state_changed_cb (GstBus *bus, GstMessage *msg, GStreamerBackend *self)
{
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
/* Only pay attention to messages coming from the pipeline, not its children */
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (self->pipeline)) {
gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
[self setUIMessage:message];
g_free (message);
}
}
-(void) _poll_gst_bus
/* Check if all conditions are met to report GStreamer as initialized.
* These conditions will change depending on the application */
-(void) check_initialization_complete
{
if (!initialized && main_loop) {
GST_DEBUG ("Initialization complete, notifying application.");
if (delegate && [delegate respondsToSelector:@selector(gstreamerInitialized)])
{
[delegate gstreamerInitialized];
}
initialized = TRUE;
}
}
/* Main method for the native code. This is executed on its own thread. */
-(void) app_function
{
GstBus *bus;
GstMessage *msg;
/* Wait until error or EOS */
bus = gst_element_get_bus (self->pipeline);
msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,
(GstMessageType) (GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
gst_object_unref(bus);
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_EOS:
[self stop];
[self notifyEos];
NSLog(@"EOS");
break;
case GST_MESSAGE_ERROR: {
GError *gerr = NULL;
gchar *debug;
gst_message_parse_error(msg, &gerr, &debug);
[self stop];
NSLog(@"Error %s - %s", gerr->message, debug, nil);
[self notifyError:gerr->message];
g_free(debug);
g_error_free(gerr);
}
break;
default:
break;
}
}
-(BOOL) initializePipeline
{
GSource *bus_source;
GError *error = NULL;
GST_DEBUG ("Creating pipeline");
/* Create our own GLib Main Context and make it the default one */
context = g_main_context_new ();
g_main_context_push_thread_default(context);
if (pipeline)
return YES;
/* Build pipeline */
pipeline = gst_parse_launch("audiotestsrc ! audioconvert ! audioresample ! autoaudiosink", &error);
if (error) {
gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
g_clear_error (&error);
[self notifyError:message];
[self setUIMessage:message];
g_free (message);
return NO;
return;
}
/* start the bus polling. This will the bus being continuously polled */
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
while (1) {
[self _poll_gst_bus];
}
});
/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
bus = gst_element_get_bus (pipeline);
bus_source = gst_bus_create_watch (bus);
g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func, NULL, NULL);
g_source_attach (bus_source, context);
g_source_unref (bus_source);
g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, (__bridge void *)self);
g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, (__bridge void *)self);
gst_object_unref (bus);
return YES;
/* Create a GLib Main Loop and set it to run */
GST_DEBUG ("Entering main loop...");
main_loop = g_main_loop_new (context, FALSE);
[self check_initialization_complete];
g_main_loop_run (main_loop);
GST_DEBUG ("Exited main loop");
g_main_loop_unref (main_loop);
main_loop = NULL;
/* Free resources */
g_main_context_pop_thread_default(context);
g_main_context_unref (context);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return;
}
-(void) play
{
if(gst_element_set_state(pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
[self notifyError:"Failed to set pipeline to playing"];
[self setUIMessage:"Failed to set pipeline to playing"];
}
}
-(void) pause
{
if(gst_element_set_state(pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE) {
[self notifyError:"Failed to set pipeline to paused"];
[self setUIMessage:"Failed to set pipeline to paused"];
}
}
@ -121,13 +163,5 @@
gst_element_set_state(pipeline, GST_STATE_NULL);
}
-(NSString*) getGStreamerVersion
{
char *str = gst_version_string();
NSString *version = [NSString stringWithUTF8String:str];
g_free(str);
return version;
}
@end

4
gst-sdk/tutorials/xcode iOS/Tutorial 2/GStreamerBackendDelegate.h
View file

@ -3,7 +3,7 @@
@protocol GStreamerBackendDelegate <NSObject>
@optional
-(void) gstreamerError:(NSString *)message from:(id)sender;
-(void) gstreamerEosFrom:(id)sender;
-(void) gstreamerInitialized;
-(void) gstreamerSetUIMessage:(NSString *)message;
@end

7
gst-sdk/tutorials/xcode iOS/Tutorial 2/ViewController.h
View file

@ -2,13 +2,16 @@
#import "GStreamerBackendDelegate.h"
@interface ViewController : UIViewController <GStreamerBackendDelegate> {
IBOutlet UILabel *message_label;
IBOutlet UIButton *play_button;
IBOutlet UIButton *pause_button;
}
-(IBAction) play:(id)sender;
-(IBAction) pause:(id)sender;
/* From GStreamerBackendDelegate */
-(void) gstreamerError:(NSString *)message from:(id)sender;
-(void) gstreamerEosFrom:(id)sender;
-(void) gstreamerInitialized;
-(void) gstreamerSetUIMessage:(NSString *)message;
@end

32
gst-sdk/tutorials/xcode iOS/Tutorial 2/ViewController.m
View file

@ -13,14 +13,11 @@
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
gst_backend = [[GStreamerBackend alloc] init];
if (![gst_backend initializePipeline]) {
}
gst_backend.delegate = self;
play_button.enabled = FALSE;
pause_button.enabled = FALSE;
gst_backend = [[GStreamerBackend alloc] init:self];
}
- (void)didReceiveMemoryWarning
@ -39,28 +36,19 @@
[gst_backend pause];
}
-(void) gstreamerError:(NSString *)message from:(id)sender
-(void) gstreamerInitialized
{
NSLog(@"Error %@", message, nil);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"GStreamer error"
message:message
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
dispatch_async(dispatch_get_main_queue(), ^{
/* make sure it runs from the main thread */
[alert show];
play_button.enabled = TRUE;
pause_button.enabled = TRUE;
message_label.text = @"Ready";
});
}
-(void) gstreamerEosFrom:(id)sender
-(void) gstreamerSetUIMessage:(NSString *)message
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"EOS" message:@"End of stream" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
dispatch_async(dispatch_get_main_queue(), ^{
/* make sure it runs from the main thread */
[alert show];
message_label.text = message;
});
}

64
gst-sdk/tutorials/xcode iOS/Tutorial 2/en.lproj/MainStoryboard_iPad.storyboard
View file

@ -12,17 +12,26 @@
<rect key="frame" x="0.0" y="20" width="768" height="1004"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="nMR-rP-TAZ" userLabel="Buttons">
<view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="nMR-rP-TAZ" userLabel="Content">
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="elU-wp-Qp2">
<label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Initializing..." textAlignment="center" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" preferredMaxLayoutWidth="688" translatesAutoresizingMaskIntoConstraints="NO" id="UBA-ZM-cSe" userLabel="Message">
<fontDescription key="fontDescription" type="system" pointSize="24"/>
<color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
<nil key="highlightedColor"/>
</label>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="elU-wp-Qp2" userLabel="Play">
<constraints>
<constraint firstAttribute="width" constant="180" type="user" id="uTI-bm-bpQ"/>
<constraint firstAttribute="height" constant="100" type="user" id="4hh-98-fyR"/>
<constraint firstAttribute="width" constant="400" type="user" id="uTI-bm-bpQ"/>
</constraints>
<fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
<fontDescription key="fontDescription" type="boldSystem" pointSize="32"/>
<state key="normal" title="Play">
<color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
<color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="disabled">
<color key="titleColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="highlighted">
<color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
</state>
@ -30,15 +39,19 @@
<action selector="play:" destination="2" eventType="touchUpInside" id="Rji-r8-PDd"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="w2M-v5-UAa">
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="w2M-v5-UAa" userLabel="Pause">
<constraints>
<constraint firstAttribute="width" constant="180" type="user" id="S8q-2J-07k"/>
<constraint firstAttribute="height" constant="100" type="user" id="L6h-G1-RwS"/>
<constraint firstAttribute="width" constant="400" type="user" id="S8q-2J-07k"/>
</constraints>
<fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
<fontDescription key="fontDescription" type="boldSystem" pointSize="32"/>
<state key="normal" title="Pause">
<color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
<color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="disabled">
<color key="titleColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="highlighted">
<color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
</state>
@ -47,28 +60,53 @@
</connections>
</button>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
<color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="elU-wp-Qp2" firstAttribute="top" secondItem="UBA-ZM-cSe" secondAttribute="bottom" constant="8" symbolic="YES" type="user" id="18h-11-jhy"/>
<constraint firstItem="w2M-v5-UAa" firstAttribute="top" secondItem="elU-wp-Qp2" secondAttribute="bottom" constant="8" symbolic="YES" type="user" id="6GJ-37-EcB"/>
<constraint firstAttribute="centerX" secondItem="w2M-v5-UAa" secondAttribute="centerX" type="user" id="7jU-ts-TJx"/>
<constraint firstAttribute="trailing" secondItem="UBA-ZM-cSe" secondAttribute="trailing" constant="20" symbolic="YES" type="user" id="EkQ-sA-oVc"/>
<constraint firstAttribute="centerX" secondItem="elU-wp-Qp2" secondAttribute="centerX" type="user" id="EuX-Nw-e9K"/>
<constraint firstAttribute="bottom" secondItem="w2M-v5-UAa" secondAttribute="bottom" constant="20" symbolic="YES" type="default" id="Rdi-ax-p63"/>
<constraint firstItem="w2M-v5-UAa" firstAttribute="top" secondItem="elU-wp-Qp2" secondAttribute="bottom" constant="8" symbolic="YES" type="default" id="ZJv-bm-2N8"/>
<constraint firstItem="elU-wp-Qp2" firstAttribute="top" secondItem="nMR-rP-TAZ" secondAttribute="top" constant="20" symbolic="YES" type="default" id="etT-xj-mf4"/>
<constraint firstAttribute="bottom" secondItem="w2M-v5-UAa" secondAttribute="bottom" constant="20" symbolic="YES" type="default" id="LCr-Rv-UZs"/>
<constraint firstItem="UBA-ZM-cSe" firstAttribute="top" secondItem="nMR-rP-TAZ" secondAttribute="top" constant="20" symbolic="YES" type="user" id="nNG-sn-bRM"/>
<constraint firstItem="UBA-ZM-cSe" firstAttribute="leading" secondItem="nMR-rP-TAZ" secondAttribute="leading" constant="20" symbolic="YES" type="user" id="pJE-Vl-N8j"/>
</constraints>
</view>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="nMR-rP-TAZ" firstAttribute="leading" secondItem="5" secondAttribute="leading" constant="20" symbolic="YES" type="user" id="E7n-88-e9Y"/>
<constraint firstAttribute="centerY" secondItem="nMR-rP-TAZ" secondAttribute="centerY" type="user" id="VKP-3B-S4N"/>
<constraint firstAttribute="centerX" secondItem="nMR-rP-TAZ" secondAttribute="centerX" type="user" id="cFL-r5-ip5"/>
<constraint firstAttribute="centerX" secondItem="nMR-rP-TAZ" secondAttribute="centerX" type="user" id="SAT-T4-FL2"/>
<constraint firstAttribute="centerY" secondItem="nMR-rP-TAZ" secondAttribute="centerY" type="user" id="SfA-hs-2KS"/>
<constraint firstItem="nMR-rP-TAZ" firstAttribute="top" secondItem="5" secondAttribute="top" priority="1" constant="20" symbolic="YES" type="user" id="XdK-Aa-fKA"/>
</constraints>
</view>
<connections>
<outlet property="message_label" destination="UBA-ZM-cSe" id="o2e-1J-nKs"/>
<outlet property="pause_button" destination="w2M-v5-UAa" id="PKY-tN-Lod"/>
<outlet property="play_button" destination="elU-wp-Qp2" id="C54-Xz-aIt"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="3" sceneMemberID="firstResponder"/>
</objects>
</scene>
</scenes>
<classes>
<class className="NSLayoutConstraint" superclassName="NSObject">
<source key="sourceIdentifier" type="project" relativePath="./Classes/NSLayoutConstraint.h"/>
</class>
<class className="ViewController" superclassName="UIViewController">
<source key="sourceIdentifier" type="project" relativePath="./Classes/ViewController.h"/>
<relationships>
<relationship kind="action" name="pause:"/>
<relationship kind="action" name="play:"/>
<relationship kind="outlet" name="label" candidateClass="UILabel"/>
<relationship kind="outlet" name="message_label" candidateClass="UILabel"/>
<relationship kind="outlet" name="pause_button" candidateClass="UIButton"/>
<relationship kind="outlet" name="play_button" candidateClass="UIButton"/>
</relationships>
</class>
</classes>
<simulatedMetricsContainer key="defaultSimulatedMetrics">
<simulatedStatusBarMetrics key="statusBar" statusBarStyle="blackTranslucent"/>
<simulatedOrientationMetrics key="orientation"/>

83
gst-sdk/tutorials/xcode iOS/Tutorial 2/en.lproj/MainStoryboard_iPhone.storyboard
View file

@ -1,89 +1,98 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="2.0" toolsVersion="3084" systemVersion="11G63" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="pxQ-Ha-9Mf">
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="2.0" toolsVersion="3084" systemVersion="11G63" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="kYn-Hr-MJq">
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="2083"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="Vig-3P-QBd">
<scene sceneID="3nc-d3-XH9">
<objects>
<viewController id="pxQ-Ha-9Mf" customClass="ViewController" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="OMs-0e-qTd">
<viewController id="kYn-Hr-MJq" customClass="ViewController" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="JOS-rK-Hts">
<rect key="frame" x="0.0" y="20" width="320" height="548"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="GxN-0E-u6U" userLabel="Buttons">
<view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="pac-D3-jCF" userLabel="Content">
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="vb0-jC-MBX">
<label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" text="Initializing..." textAlignment="center" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" preferredMaxLayoutWidth="240" translatesAutoresizingMaskIntoConstraints="NO" id="8wd-E5-Owx" userLabel="Message">
<fontDescription key="fontDescription" type="system" pointSize="16"/>
<color key="textColor" cocoaTouchSystemColor="darkTextColor"/>
<nil key="highlightedColor"/>
</label>
<button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="uVI-yQ-geg" userLabel="Play">
<constraints>
<constraint firstAttribute="width" constant="180" type="user" id="JWj-Ts-QpO"/>
<constraint firstAttribute="height" constant="100" type="user" id="D1U-D7-pGb"/>
<constraint firstAttribute="width" constant="200" type="user" id="H9m-EA-1Y9"/>
</constraints>
<fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
<fontDescription key="fontDescription" type="boldSystem" pointSize="24"/>
<state key="normal" title="Play">
<color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
<color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="disabled">
<color key="titleColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="highlighted">
<color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
</state>
<connections>
<action selector="play:" destination="pxQ-Ha-9Mf" eventType="touchUpInside" id="720-pe-ZQg"/>
<action selector="play:" destination="kYn-Hr-MJq" eventType="touchUpInside" id="lem-QX-Nov"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eNS-GM-32O">
<button opaque="NO" contentMode="scaleToFill" enabled="NO" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="w5n-dd-01i" userLabel="Pause">
<constraints>
<constraint firstAttribute="width" constant="180" type="user" id="qyb-TL-L8J"/>
<constraint firstAttribute="height" constant="100" type="user" id="heT-S6-HPW"/>
<constraint firstAttribute="width" constant="200" type="user" id="zY8-bB-SYS"/>
</constraints>
<fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
<fontDescription key="fontDescription" type="boldSystem" pointSize="24"/>
<state key="normal" title="Pause">
<color key="titleColor" red="0.19607843459999999" green="0.30980393290000002" blue="0.52156865600000002" alpha="1" colorSpace="calibratedRGB"/>
<color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="disabled">
<color key="titleColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
</state>
<state key="highlighted">
<color key="titleColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
</state>
<connections>
<action selector="pause:" destination="pxQ-Ha-9Mf" eventType="touchUpInside" id="prA-YD-hYl"/>
<action selector="pause:" destination="kYn-Hr-MJq" eventType="touchUpInside" id="eZ6-M4-XBq"/>
</connections>
</button>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
<color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="vb0-jC-MBX" firstAttribute="top" secondItem="GxN-0E-u6U" secondAttribute="top" constant="20" symbolic="YES" type="default" id="06u-Jm-lfM"/>
<constraint firstAttribute="centerX" secondItem="eNS-GM-32O" secondAttribute="centerX" type="user" id="Sep-Aj-htp"/>
<constraint firstAttribute="centerX" secondItem="vb0-jC-MBX" secondAttribute="centerX" type="user" id="gmk-PR-KdB"/>
<constraint firstItem="eNS-GM-32O" firstAttribute="top" secondItem="vb0-jC-MBX" secondAttribute="bottom" constant="8" symbolic="YES" type="default" id="lun-xW-CAi"/>
<constraint firstAttribute="bottom" secondItem="eNS-GM-32O" secondAttribute="bottom" constant="20" symbolic="YES" type="default" id="xWq-oD-d5F"/>
<constraint firstAttribute="centerX" secondItem="uVI-yQ-geg" secondAttribute="centerX" type="user" id="2Wc-AU-tx5"/>
<constraint firstItem="8wd-E5-Owx" firstAttribute="leading" secondItem="pac-D3-jCF" secondAttribute="leading" constant="20" symbolic="YES" type="user" id="3rd-sw-9RW"/>
<constraint firstAttribute="centerX" secondItem="w5n-dd-01i" secondAttribute="centerX" type="user" id="3se-ej-QVc"/>
<constraint firstAttribute="trailing" secondItem="8wd-E5-Owx" secondAttribute="trailing" constant="20" symbolic="YES" type="user" id="FyO-Cv-ZON"/>
<constraint firstItem="uVI-yQ-geg" firstAttribute="top" secondItem="8wd-E5-Owx" secondAttribute="bottom" constant="8" symbolic="YES" type="user" id="Lte-nX-y3p"/>
<constraint firstItem="w5n-dd-01i" firstAttribute="top" secondItem="uVI-yQ-geg" secondAttribute="bottom" constant="8" symbolic="YES" type="user" id="Tqh-LF-05e"/>
<constraint firstItem="8wd-E5-Owx" firstAttribute="top" secondItem="pac-D3-jCF" secondAttribute="top" constant="20" symbolic="YES" type="user" id="dXW-gd-gnP"/>
<constraint firstAttribute="bottom" secondItem="w5n-dd-01i" secondAttribute="bottom" constant="20" symbolic="YES" type="default" id="dbq-X8-9Im"/>
</constraints>
</view>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="GxN-0E-u6U" firstAttribute="leading" secondItem="OMs-0e-qTd" secondAttribute="leading" constant="20" symbolic="YES" type="user" id="H5s-xz-Nfc"/>
<constraint firstAttribute="centerX" secondItem="GxN-0E-u6U" secondAttribute="centerX" type="user" id="dKd-jH-42g"/>
<constraint firstAttribute="centerY" secondItem="GxN-0E-u6U" secondAttribute="centerY" type="user" id="x24-bd-at0"/>
<constraint firstItem="pac-D3-jCF" firstAttribute="top" secondItem="JOS-rK-Hts" secondAttribute="top" priority="1" constant="20" symbolic="YES" type="user" id="77r-Ci-q9w"/>
<constraint firstItem="pac-D3-jCF" firstAttribute="top" secondItem="JOS-rK-Hts" secondAttribute="top" priority="1" constant="20" symbolic="YES" type="user" id="MGJ-u0-MAG"/>
<constraint firstAttribute="centerX" secondItem="pac-D3-jCF" secondAttribute="centerX" type="user" id="Y2t-0q-fAJ"/>
<constraint firstItem="pac-D3-jCF" firstAttribute="leading" secondItem="JOS-rK-Hts" secondAttribute="leading" constant="20" symbolic="YES" type="user" id="dPX-1l-W4G"/>
<constraint firstAttribute="centerY" secondItem="pac-D3-jCF" secondAttribute="centerY" type="user" id="pxX-Qj-nAV"/>
</constraints>
</view>
<simulatedStatusBarMetrics key="simulatedStatusBarMetrics"/>
<connections>
<outlet property="message_label" destination="8wd-E5-Owx" id="7Xw-cg-3hH"/>
<outlet property="pause_button" destination="w5n-dd-01i" id="lHm-u3-mcA"/>
<outlet property="play_button" destination="uVI-yQ-geg" id="vI5-ma-lhA"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="3Wk-O5-Z1z" sceneMemberID="firstResponder"/>
<placeholder placeholderIdentifier="IBFirstResponder" id="25z-hu-OZW" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="423" y="158"/>
</scene>
</scenes>
<classes>
<class className="NSLayoutConstraint" superclassName="NSObject">
<source key="sourceIdentifier" type="project" relativePath="./Classes/NSLayoutConstraint.h"/>
</class>
<class className="ViewController" superclassName="UIViewController">
<source key="sourceIdentifier" type="project" relativePath="./Classes/ViewController.h"/>
<relationships>
<relationship kind="action" name="pause:"/>
<relationship kind="action" name="play:"/>
<relationship kind="outlet" name="label" candidateClass="UILabel"/>
</relationships>
</class>
</classes>
<simulatedMetricsContainer key="defaultSimulatedMetrics">
<simulatedStatusBarMetrics key="statusBar"/>
<simulatedOrientationMetrics key="orientation"/>