问题描述
我收到错误–9405，couldntGetRequiredComponent，
I am getting an error –9405, couldntGetRequiredComponent, with
SGNewChannel(m_Grabber, VideoMediaType, &m_Channel)
在Mac系统10.9.1上为
.该代码在较旧的系统上有效.还有其他人遇到这个问题吗?
on Mac system 10.9.1. This code works on older systems. Is anyone else having this issue?
编辑-初始化代码:
// standard SG initialization
err = OpenADefaultComponent(SeqGrabComponentType, 0, &m_Grabber);
err = SGInitialize(m_Grabber);
err = SGSetDataRef(m_Grabber, 0, 0, seqGrabDontMakeMovie);
推荐答案
花了一些时间进行逆向工程后，SGNewChannel在OS X 10.8和10.9上都做了什么，我发现可能是10.9上新行为的原因.
After spending some time reverse engineering what SGNewChannel does on both OS X 10.8 and 10.9 I have found what might be the cause of the new behavior on 10.9.
SGNewChannel函数尝试使用一些与此大致等效的代码(减去日志)来打开视频数字化仪组件:
The SGNewChannel function tries to open a video digitizer component with some code roughly equivalent to this (minus the logs):
ComponentDescription componentDescription = {'vdig', 0, 0, 0, 0};
Component component = FindNextComponent(NULL, &componentDescription);
while (component)
{
Handle componentName = NewHandle(255);
Handle componentInfo = NewHandle(255);
GetComponentInfo(component, NULL, componentName, componentInfo, NULL);
ComponentInstance ci;
OSErr err = OpenAComponent(component, &ci);
printf("*** %5d (%p) %p %s -- %s\n", err, ci, component, P2CStr((StringPtr)*componentName), P2CStr((StringPtr)*componentInfo));
DisposeHandle(componentName);
DisposeHandle(componentInfo);
component = FindNextComponent(component, &componentDescription);
}
如果在10.9上运行此命令，则会得到以下结果:
If you run this on 10.9, you will get this result:
DVFreeThread - CFMachPortCreateWithPort hack = 0x18caf0, fPowerNotifyPort= 0x18ce90
*** -9408 (0x0) 0x10207 DV Video -- This component is the FireWire Video Digitizer
*** 704 (0x0) 0x10216 IIDC FireWire Video -- This is the Apple IIDC FireWire Video Digitizer.
*** 704 (0x0) 0x10323 USB Video Class Video -- This is the Apple USB Video Class Video Digitizer.
对OpenAComponent的三个调用均失败(一次错误-9408，两次错误704).
The three calls to OpenAComponent fail (once with error -9408 and twice with error 704).
如果在10.8上运行此命令，则会得到以下结果:
If you run this on 10.8, you will get this result:
DVFreeThread - CFMachPortCreateWithPort hack = 0x5751a0, fPowerNotifyPort= 0x576cd0
*** -9408 (0x0) 0x10208 DV Video -- This component is the FireWire Video Digitizer
*** 704 (0x0) 0x10217 IIDC FireWire Video -- This is the Apple IIDC FireWire Video Digitizer.
*** 0 (0x830000) 0x10324 USB Video Class Video -- This is the Apple USB Video Class Video Digitizer.
注意最后一次呼叫成功！
Notice that the last calls succeeds!
Apple USB视频类视频数字化仪组件位于/System/Library/QuickTime/QuickTimeUSBVDCDigitizer.component.因此，我通过在APWVDOUSBVDCDigitizerEntry上的lldb中设置符号断点(该组件的入口点)来查看该组件在10.8和10.9上有什么不同.
The Apple USB Video Class Video Digitizer component is located at /System/Library/QuickTime/QuickTimeUSBVDCDigitizer.component. So I looked at what’s different on 10.8 and 10.9 in this component by setting a symbolic breakpoint in lldb on APWVDOUSBVDCDigitizerEntry which is the entry point of this component.
事实证明，这可能是与沙盒相关的问题.在10.9上，device-camera的sandbox_check调用在10.8上不存在.因此，我建议您尝试添加访问摄像机的权利，看看是否可以解决问题.
It turns out it may be a sandbox related issue. On 10.9, there is a call to sandbox_check for device-camera that doesn’t exist on 10.8. So I suggest that you try to add an entitlement to access the camera and see if that solves the problem.
这篇关于在Mac 10.9.1上SGNewChannel错误-9405的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！