Unify the macOS and iOS capturer implementations

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

-/*
- *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#pragma mark **** imports/includes
-
-#import "webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.h"
-
-#include "webrtc/system_wrappers/include/trace.h"
-
-using namespace webrtc;
-
-#pragma mark **** hidden class interface
-
-@implementation VideoCaptureMacQTKitInfoObjC
-
-// ****************** over-written OS methods ***********************
-#pragma mark **** over-written OS methods
-
-/// ***** Objective-C. Similar to C++ constructor, although invoked manually
-/// ***** Potentially returns an instance of self
--(id)init{
-    self = [super init];
-    if(nil != self){
-        [self checkOSSupported];
-        [self initializeVariables];
-    }
-    else
-    {
-        return nil;
-    }
-    return self;
-}
-
-/// ***** Objective-C. Similar to C++ destructor
-/// ***** Returns nothing
-- (void)dealloc {
-
-    [_captureDevicesInfo release];
-
-    [super dealloc];
-}
-
-// ****************** public methods ******************
-#pragma mark **** public method implementations
-
-/// ***** Creates a message box with Cocoa framework
-/// ***** Returns 0 on success, -1 otherwise.
-- (NSNumber*)displayCaptureSettingsDialogBoxWithDevice:(const char*)deviceUniqueIdUTF8
-                    AndTitle:(const char*)dialogTitleUTF8
-                    AndParentWindow:(void*) parentWindow
-                    AtX:(uint32_t)positionX
-                    AndY:(uint32_t) positionY
-{
-    NSString* strTitle = [NSString stringWithFormat:@"%s", dialogTitleUTF8];
-    NSString* strButton = @"Alright";
-    NSAlert* alert = [NSAlert alertWithMessageText:strTitle
-                      defaultButton:strButton
-                      alternateButton:nil otherButton:nil
-                      informativeTextWithFormat:@"Device %s is capturing", deviceUniqueIdUTF8];
-    [alert setAlertStyle:NSInformationalAlertStyle];
-    [alert runModal];
-    return [NSNumber numberWithInt:0];
-}
-
-- (NSNumber*)getCaptureDeviceCount{
-    [self getCaptureDevices];
-    return [NSNumber numberWithInt:_captureDeviceCountInfo];
-}
-
-
-- (NSNumber*)getDeviceNamesFromIndex:(uint32_t)index
-    DefaultName:(char*)deviceName
-    WithLength:(uint32_t)deviceNameLength
-    AndUniqueID:(char*)deviceUniqueID
-    WithLength:(uint32_t)deviceUniqueIDLength
-    AndProductID:(char*)deviceProductID
-    WithLength:(uint32_t)deviceProductIDLength
-{
-    if(NO == _OSSupportedInfo)
-    {
-        return [NSNumber numberWithInt:0];
-    }
-
-    if(index >= (uint32_t)_captureDeviceCountInfo)
-    {
-        return [NSNumber numberWithInt:-1];
-    }
-
-    QTCaptureDevice* tempCaptureDevice =
-        (QTCaptureDevice*)[_captureDevicesInfo objectAtIndex:index];
-    if(!tempCaptureDevice)
-    {
-        return [NSNumber numberWithInt:-1];
-    }
-
-    memset(deviceName, 0, deviceNameLength);
-    memset(deviceUniqueID, 0, deviceUniqueIDLength);
-
-    bool successful = NO;
-
-    NSString* tempString = [tempCaptureDevice localizedDisplayName];
-    successful = [tempString getCString:(char*)deviceName
-                  maxLength:deviceNameLength encoding:NSUTF8StringEncoding];
-    if(NO == successful)
-    {
-        memset(deviceName, 0, deviceNameLength);
-        return [NSNumber numberWithInt:-1];
-    }
-
-    tempString = [tempCaptureDevice uniqueID];
-    successful = [tempString getCString:(char*)deviceUniqueID
-                  maxLength:deviceUniqueIDLength encoding:NSUTF8StringEncoding];
-    if(NO == successful)
-    {
-        memset(deviceUniqueID, 0, deviceNameLength);
-        return [NSNumber numberWithInt:-1];
-    }
-
-    return [NSNumber numberWithInt:0];
-
-}
-
-// ****************** "private" category functions below here  ******************
-#pragma mark **** "private" method implementations
-
-- (NSNumber*)initializeVariables
-{
-    if(NO == _OSSupportedInfo)
-    {
-        return [NSNumber numberWithInt:0];
-    }
-
-    _poolInfo = [[NSAutoreleasePool alloc]init];
-    _captureDeviceCountInfo = 0;
-    [self getCaptureDevices];
-
-    return [NSNumber numberWithInt:0];
-}
-
-// ***** Checks to see if the QTCaptureSession framework is available in the OS
-// ***** If it is not, isOSSupprted = NO
-// ***** Throughout the rest of the class isOSSupprted is checked and functions
-// ***** are/aren't called depending
-// ***** The user can use weak linking to the QTKit framework and run on older
-// ***** versions of the OS
-// ***** I.E. Backwards compaitibility
-// ***** Returns nothing. Sets member variable
-- (void)checkOSSupported
-{
-    Class osSupportedTest = NSClassFromString(@"QTCaptureSession");
-    if(nil == osSupportedTest)
-    {
-      _OSSupportedInfo = NO;
-    }
-    else
-    {
-      _OSSupportedInfo = YES;
-    }
-}
-
-/// ***** Retrieves the number of capture devices currently available
-/// ***** Stores them in an NSArray instance
-/// ***** Returns 0 on success, -1 otherwise.
-- (NSNumber*)getCaptureDevices
-{
-    if(NO == _OSSupportedInfo)
-    {
-        return [NSNumber numberWithInt:0];
-    }
-
-    if(_captureDevicesInfo)
-    {
-        [_captureDevicesInfo release];
-    }
-    _captureDevicesInfo = [[NSArray alloc]
-                            initWithArray:[QTCaptureDevice
-                                           inputDevicesWithMediaType:QTMediaTypeVideo]];
-
-    _captureDeviceCountInfo = _captureDevicesInfo.count;
-
-    return [NSNumber numberWithInt:0];
-}
-
-@end