iOS Webrtc – 捕获本地video流时崩溃
我正在尝试使用Google的回购中的webrtc库。 我按照步骤创建了一个单独的项目，其中包含类似于APPRTC的说明和代码，我能够使其正常运行。 我能够在两台设备之间进行会议。 但是当我尝试与较旧的项目集成时，Webrtc崩溃了。 以下是重现崩溃的步骤。
- 初始化对等连接工厂
- 尝试在主线程中创建本地video流
- 应用程序崩溃
当我尝试在下面的代码片段中创建VideoSource时，我遇到了崩溃。 任何提示或建议表示赞赏。
- (RTCVideoTrack *)createLocalVideoTrack { RTCVideoTrack *localVideoTrack = nil; if (_peerConnection && self.localMediaStream) { [_peerConnection removeStream:self.localMediaStream]; self.localMediaStream=nil; self.localVideoTrack=nil; self.localAudioTrack=nil; } NSString *cameraID = nil; AVCaptureDevicePosition devicePosition; if (self.captureDevice == kWebrtcMediaCaptureDeviceFrontCam) { devicePosition = AVCaptureDevicePositionFront; } else{ devicePosition = AVCaptureDevicePositionBack; } for (AVCaptureDevice *captureDevice in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) { if (captureDevice.position == devicePosition) { //[self configureCameraForHighestFrameRate:captureDevice]; cameraID = [captureDevice localizedName]; break; } } NSAssert(cameraID, @"Unable to get the front camera id"); RTCVideoCapturer *capturer = [RTCVideoCapturer capturerWithDeviceName:cameraID]; RTCMediaConstraints *mediaConstraints = [self defaultMediaStreamConstraints]; RTCVideoSource *videoSource = [_factory videoSourceWithCapturer:capturer constraints:mediaConstraints]; localVideoTrack = [_factory videoTrackWithID:@"ARDAMSv0" source:videoSource]; return localVideoTrack; } And the crash log * thread #1: tid = 0x33125c, 0x320b9b2c libsystem_kernel.dylib`__psynch_cvwait + 24, queue = 'com.apple.main-thread' frame #0: 0x320b9b2c libsystem_kernel.dylib`__psynch_cvwait + 24 frame #1: 0x32137388 libsystem_pthread.dylib`_pthread_cond_wait + 520 frame #2: 0x3213826c libsystem_pthread.dylib`pthread_cond_wait + 40 frame #3: 0x00515230 `rtc::Event::Wait(int) + 160 * frame #4: 0x003e4912 `webrtc::MethodCall2<webrtc::PeerConnectionFactoryInterface, rtc::scoped_refptr, cricket::VideoCapturer*, webrtc::MediaConstraintsInterface const*>::Marshal(rtc::Thread*) + 46 frame #5: 0x003e419c `webrtc::PeerConnectionFactoryProxy::CreateVideoSource(cricket::VideoCapturer*, webrtc::MediaConstraintsInterface const*) + 68 frame #6: 0x00414470 `-[RTCPeerConnectionFactory videoSourceWithCapturer:constraints:] + 192 frame #7: 0x0001fc4e `-[WebrtcManager createLocalVideoTrack](self=0x01896620, _cmd=0x0083e058) + 1662 at WebrtcManager.m:360 frame #8: 0x0001ca96 `__40-[WebrtcManager initializeWebrtcManager]_block_invoke(.block_descriptor=) + 46 at WebrtcManager.m:46 frame #9: 0x01420172 libdispatch.dylib`_dispatch_call_block_and_release + 10 frame #10: 0x0142015e libdispatch.dylib`_dispatch_client_callout + 22 frame #11: 0x01423e44 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 1512 frame #12: 0x234ad608 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8 frame #13: 0x234abd08 CoreFoundation`__CFRunLoopRun + 1512 frame #14: 0x233f8200 CoreFoundation`CFRunLoopRunSpecific + 476 frame #15: 0x233f8012 CoreFoundation`CFRunLoopRunInMode + 106 frame #16: 0x2ac91200 GraphicsServices`GSEventRunModal + 136 frame #17: 0x26b9ca58 UIKit`UIApplicationMain + 1440 frame #18: 0x00279f60 `main(argc=1, argv=0x00e37a78) + 132 at main.m:17
我的错！ 我试图在工作线程中创建PeerConnectionFactory和LocalVideoTrack！ 当我将它们移动到主线程时问题解决了。 我已经在Apprtc-Swift中上传了apprtc版本， 并对 本教程进行了描述
我遇到了同样的问题但是通过为摄像头和麦克风权限提示添加两个Info-plist值来解决它：
Privacy - Microphone Usage Description
Privacy - Camera Usage Description
该值是您要在权限提示中显示的字符串