src/third_party/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm

   1 /*
   2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11 #pragma mark **** imports/includes
  12
  13 #import "webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.h"
  14
  15 #include "webrtc/system_wrappers/interface/trace.h"
  16
  17 using namespace webrtc;
  18
  19 #pragma mark **** hidden class interface
  20
  21 @implementation VideoCaptureMacQTKitInfoObjC
  22
  23 // ****************** over-written OS methods ***********************
  24 #pragma mark **** over-written OS methods
  25
  26 /// ***** Objective-C. Similar to C++ constructor, although invoked manually
  27 /// ***** Potentially returns an instance of self
  28 -(id)init{
  29     self = [super init];
  30     if(nil != self){
  31         [self checkOSSupported];
  32         [self initializeVariables];
  33     }
  34     else
  35     {
  36         return nil;
  37     }
  38     return self;
  39 }
  40
  41 /// ***** Objective-C. Similar to C++ destructor
  42 /// ***** Returns nothing
  43 - (void)dealloc {
  44
  45     [_captureDevicesInfo release];
  46
  47     [super dealloc];
  48 }
  49
  50 // ****************** public methods ******************
  51 #pragma mark **** public method implementations
  52
  53 /// ***** Creates a message box with Cocoa framework
  54 /// ***** Returns 0 on success, -1 otherwise.
  55 - (NSNumber*)displayCaptureSettingsDialogBoxWithDevice:(const char*)deviceUniqueIdUTF8
  56                     AndTitle:(const char*)dialogTitleUTF8
  57                     AndParentWindow:(void*) parentWindow
  58                     AtX:(uint32_t)positionX
  59                     AndY:(uint32_t) positionY
  60 {
  61     NSString* strTitle = [NSString stringWithFormat:@"%s", dialogTitleUTF8];
  62     NSString* strButton = @"Alright";
  63     NSAlert* alert = [NSAlert alertWithMessageText:strTitle
  64                       defaultButton:strButton
  65                       alternateButton:nil otherButton:nil
  66                       informativeTextWithFormat:@"Device %s is capturing", deviceUniqueIdUTF8];
  67     [alert setAlertStyle:NSInformationalAlertStyle];
  68     [alert runModal];
  69     return [NSNumber numberWithInt:0];
  70 }
  71
  72 - (NSNumber*)getCaptureDeviceCount{
  73     [self getCaptureDevices];
  74     return [NSNumber numberWithInt:_captureDeviceCountInfo];
  75 }
  76
  77
  78 - (NSNumber*)getDeviceNamesFromIndex:(uint32_t)index
  79     DefaultName:(char*)deviceName
  80     WithLength:(uint32_t)deviceNameLength
  81     AndUniqueID:(char*)deviceUniqueID
  82     WithLength:(uint32_t)deviceUniqueIDLength
  83     AndProductID:(char*)deviceProductID
  84     WithLength:(uint32_t)deviceProductIDLength
  85 {
  86     if(NO == _OSSupportedInfo)
  87     {
  88         return [NSNumber numberWithInt:0];
  89     }
  90
  91     if(index >= (uint32_t)_captureDeviceCountInfo)
  92     {
  93         return [NSNumber numberWithInt:-1];
  94     }
  95
  96     QTCaptureDevice* tempCaptureDevice =
  97         (QTCaptureDevice*)[_captureDevicesInfo objectAtIndex:index];
  98     if(!tempCaptureDevice)
  99     {
 100         return [NSNumber numberWithInt:-1];
 101     }
 102
 103     memset(deviceName, 0, deviceNameLength);
 104     memset(deviceUniqueID, 0, deviceUniqueIDLength);
 105
 106     bool successful = NO;
 107
 108     NSString* tempString = [tempCaptureDevice localizedDisplayName];
 109     successful = [tempString getCString:(char*)deviceName
 110                   maxLength:deviceNameLength encoding:NSUTF8StringEncoding];
 111     if(NO == successful)
 112     {
 113         memset(deviceName, 0, deviceNameLength);
 114         return [NSNumber numberWithInt:-1];
 115     }
 116
 117     tempString = [tempCaptureDevice uniqueID];
 118     successful = [tempString getCString:(char*)deviceUniqueID
 119                   maxLength:deviceUniqueIDLength encoding:NSUTF8StringEncoding];
 120     if(NO == successful)
 121     {
 122         memset(deviceUniqueID, 0, deviceNameLength);
 123         return [NSNumber numberWithInt:-1];
 124     }
 125
 126     return [NSNumber numberWithInt:0];
 127
 128 }
 129
 130 // ****************** "private" category functions below here  ******************
 131 #pragma mark **** "private" method implementations
 132
 133 - (NSNumber*)initializeVariables
 134 {
 135     if(NO == _OSSupportedInfo)
 136     {
 137         return [NSNumber numberWithInt:0];
 138     }
 139
 140     _poolInfo = [[NSAutoreleasePool alloc]init];
 141     _captureDeviceCountInfo = 0;
 142     [self getCaptureDevices];
 143
 144     return [NSNumber numberWithInt:0];
 145 }
 146
 147 // ***** Checks to see if the QTCaptureSession framework is available in the OS
 148 // ***** If it is not, isOSSupprted = NO
 149 // ***** Throughout the rest of the class isOSSupprted is checked and functions
 150 // ***** are/aren't called depending
 151 // ***** The user can use weak linking to the QTKit framework and run on older
 152 // ***** versions of the OS
 153 // ***** I.E. Backwards compaitibility
 154 // ***** Returns nothing. Sets member variable
 155 - (void)checkOSSupported
 156 {
 157     Class osSupportedTest = NSClassFromString(@"QTCaptureSession");
 158     if(nil == osSupportedTest)
 159     {
 160       _OSSupportedInfo = NO;
 161     }
 162     else
 163     {
 164       _OSSupportedInfo = YES;
 165     }
 166 }
 167
 168 /// ***** Retrieves the number of capture devices currently available
 169 /// ***** Stores them in an NSArray instance
 170 /// ***** Returns 0 on success, -1 otherwise.
 171 - (NSNumber*)getCaptureDevices
 172 {
 173     if(NO == _OSSupportedInfo)
 174     {
 175         return [NSNumber numberWithInt:0];
 176     }
 177
 178     if(_captureDevicesInfo)
 179     {
 180         [_captureDevicesInfo release];
 181     }
 182     _captureDevicesInfo = [[NSArray alloc]
 183                             initWithArray:[QTCaptureDevice
 184                                            inputDevicesWithMediaType:QTMediaTypeVideo]];
 185
 186     _captureDeviceCountInfo = _captureDevicesInfo.count;
 187
 188     return [NSNumber numberWithInt:0];
 189 }
 190
 191 @end