如何获得在Mac OS的视频采集设备（网络摄像机）的列表？ （C ++） [英] How to get a list of video capture devices (web cameras) on Mac OS? (C++)

问题描述

所以，我需要的是简单的 - 目前avaliable视频捕获设备（网络摄像头）的列表。我需要它在简单或C ++控制台应用程序。通过列表我的意思是像这样的控制台输出：

So all I need is simple - a list of currently avaliable video capture devices (web cameras). I need it in simple or C++ console app. By list I mean something like such console output:

1) Asus Web Camera
2) Sony Web Camera

所以它似乎很简单，但我有一个要求 - 利用原生操作系统的API尽可能 - 无需外部库 - 毕竟 - 我们想要的是打印出AA列表 - ！不飞至月球）（和没有用客观-C的，请 - 纯C / C ++）

So It seems simple but I have one requirement - use of native OS apis as much as possible - no external libs - after all - all we want is to print out a a list - not to fly onto the moon!) (and no use of objective-C, please - pure C/C++)

如何做这种事？

也是从这个系列：

• How获得视频捕获设备的列表上的Linux？和<一个href=\"http://stackoverflow.com/questions/4483366/how-to-get-a-list-video-capture-devices-names-web-cameras-on-linux-ubuntu\">special在得到相机名称的详细信息，提供正确，测试的答案


• How获得在Mac OS的视频采集设备的列表？用正确的的，还没有被我的答案，测试


• How获得视频捕获设备的列表上的窗口？用正确的的，测试的答案


• How获得使用Qt（跨平台）列表中的视频采集设备的名字呢？

• How to get a list of video capture devices on linux? and special details on getting cameras NAMES with correct, tested answers
• How to get a list of video capture devices on Mac OS? with correct, not yet tested by my answers
• How to get a list of video capture devices on windows? with correct, tested answers
• How to get a list video capture devices NAMES using Qt (crossplatform)?

推荐答案

您需要使用SGGetChannelDeviceList，这是QuickTime的C API的一部分。每个设备可以具有多个输入。解析它的正确方法是这样的：

You need to use SGGetChannelDeviceList, which is part of the QuickTime C API. Each device can have multiple inputs. The proper way to parse it is like this:

    // first get a video channel from the sequence grabber

   ComponentDescription    theDesc;
   Component               sgCompID;
   ComponentResult         result;
   theDesc.componentType           = SeqGrabComponentType;
   theDesc.componentSubType        = 0L;
   theDesc.componentManufacturer   = 'appl';
   theDesc.componentFlags          = 0L;
   theDesc.componentFlagsMask      = 0L;   
   sgCompID = FindNextComponent (NULL, &theDesc);
   seqGrabber = OpenComponent (sgCompID);
   result = SGInitialize (seqGrabber);
   result = SGNewChannel (seqGrabber, VideoMediaType, &videoChannel);
   SGDeviceList  theDevices;
   SGGetChannelDeviceList(videoChannel, sgDeviceListDontCheckAvailability | sgDeviceListIncludeInputs, &theDevices);

    if (theDevices)
    {
        int theDeviceIndex;
        for (theDeviceIndex = 0; theDeviceIndex != (*theDevices)->count; ++theDeviceIndex)
        {
            SGDeviceName theDeviceEntry = (*theDevices)->entry[theDeviceIndex];
            // name of device is a pstring in theDeviceEntry.name

        SGDeviceInputList theInputs = theDeviceEntry.inputs;
            if (theInputs != NULL)
            {
                int theInputIndex;
                for ( theInputIndex = 0; theInputIndex != (*theInputs)->count; ++theInputIndex)
                {
                    SGDeviceInputName theInput = (*theInputs)->entry[theInputIndex];
                    // name of input is a pstring in theInput.name
                }
            }
        }       
    }

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