| /* |
| * Copyright 2017 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. |
| */ |
| |
| #import <Foundation/Foundation.h> |
| |
| #import "WebRTC/RTCCameraVideoCapturer.h" |
| #import "WebRTC/RTCLogging.h" |
| #import "WebRTC/RTCVideoFrameBuffer.h" |
| |
| #if TARGET_OS_IPHONE |
| #import "WebRTC/UIDevice+RTCDevice.h" |
| #endif |
| |
| #import "AVCaptureSession+DevicePosition.h" |
| #import "RTCDispatcher+Private.h" |
| |
| const int64_t kNanosecondsPerSecond = 1000000000; |
| |
| @interface RTCCameraVideoCapturer ()<AVCaptureVideoDataOutputSampleBufferDelegate> |
| @property(nonatomic, readonly) dispatch_queue_t frameQueue; |
| @end |
| |
| @implementation RTCCameraVideoCapturer { |
| AVCaptureVideoDataOutput *_videoDataOutput; |
| AVCaptureSession *_captureSession; |
| AVCaptureDevice *_currentDevice; |
| FourCharCode _preferredOutputPixelFormat; |
| FourCharCode _outputPixelFormat; |
| BOOL _hasRetriedOnFatalError; |
| BOOL _isRunning; |
| // Will the session be running once all asynchronous operations have been completed? |
| BOOL _willBeRunning; |
| #if TARGET_OS_IPHONE |
| UIDeviceOrientation _orientation; |
| #endif |
| } |
| |
| @synthesize frameQueue = _frameQueue; |
| @synthesize captureSession = _captureSession; |
| |
| - (instancetype)initWithDelegate:(__weak id<RTCVideoCapturerDelegate>)delegate { |
| if (self = [super initWithDelegate:delegate]) { |
| // Create the capture session and all relevant inputs and outputs. We need |
| // to do this in init because the application may want the capture session |
| // before we start the capturer for e.g. AVCapturePreviewLayer. All objects |
| // created here are retained until dealloc and never recreated. |
| if (![self setupCaptureSession]) { |
| return nil; |
| } |
| NSNotificationCenter *center = [NSNotificationCenter defaultCenter]; |
| #if TARGET_OS_IPHONE |
| _orientation = UIDeviceOrientationPortrait; |
| [center addObserver:self |
| selector:@selector(deviceOrientationDidChange:) |
| name:UIDeviceOrientationDidChangeNotification |
| object:nil]; |
| [center addObserver:self |
| selector:@selector(handleCaptureSessionInterruption:) |
| name:AVCaptureSessionWasInterruptedNotification |
| object:_captureSession]; |
| [center addObserver:self |
| selector:@selector(handleCaptureSessionInterruptionEnded:) |
| name:AVCaptureSessionInterruptionEndedNotification |
| object:_captureSession]; |
| [center addObserver:self |
| selector:@selector(handleApplicationDidBecomeActive:) |
| name:UIApplicationDidBecomeActiveNotification |
| object:[UIApplication sharedApplication]]; |
| #endif |
| [center addObserver:self |
| selector:@selector(handleCaptureSessionRuntimeError:) |
| name:AVCaptureSessionRuntimeErrorNotification |
| object:_captureSession]; |
| [center addObserver:self |
| selector:@selector(handleCaptureSessionDidStartRunning:) |
| name:AVCaptureSessionDidStartRunningNotification |
| object:_captureSession]; |
| [center addObserver:self |
| selector:@selector(handleCaptureSessionDidStopRunning:) |
| name:AVCaptureSessionDidStopRunningNotification |
| object:_captureSession]; |
| } |
| return self; |
| } |
| |
| - (void)dealloc { |
| NSAssert( |
| !_willBeRunning, |
| @"Session was still running in RTCCameraVideoCapturer dealloc. Forgot to call stopCapture?"); |
| [[NSNotificationCenter defaultCenter] removeObserver:self]; |
| } |
| |
| + (NSArray<AVCaptureDevice *> *)captureDevices { |
| return [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; |
| } |
| |
| + (NSArray<AVCaptureDeviceFormat *> *)supportedFormatsForDevice:(AVCaptureDevice *)device { |
| // Support opening the device in any format. We make sure it's converted to a format we |
| // can handle, if needed, in the method `-setupVideoDataOutput`. |
| return device.formats; |
| } |
| |
| - (FourCharCode)preferredOutputPixelFormat { |
| return _preferredOutputPixelFormat; |
| } |
| |
| - (void)startCaptureWithDevice:(AVCaptureDevice *)device |
| format:(AVCaptureDeviceFormat *)format |
| fps:(NSInteger)fps { |
| _willBeRunning = YES; |
| [RTCDispatcher |
| dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| RTCLogInfo("startCaptureWithDevice %@ @ %ld fps", format, (long)fps); |
| |
| #if TARGET_OS_IPHONE |
| [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; |
| #endif |
| |
| _currentDevice = device; |
| |
| NSError *error = nil; |
| if (![_currentDevice lockForConfiguration:&error]) { |
| RTCLogError( |
| @"Failed to lock device %@. Error: %@", _currentDevice, error.userInfo); |
| return; |
| } |
| [self reconfigureCaptureSessionInput]; |
| [self updateOrientation]; |
| [self updateDeviceCaptureFormat:format fps:fps]; |
| [self updateVideoDataOutputPixelFormat:format]; |
| [_captureSession startRunning]; |
| [_currentDevice unlockForConfiguration]; |
| _isRunning = YES; |
| }]; |
| } |
| |
| - (void)stopCapture { |
| _willBeRunning = NO; |
| [RTCDispatcher |
| dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| RTCLogInfo("Stop"); |
| _currentDevice = nil; |
| for (AVCaptureDeviceInput *oldInput in [_captureSession.inputs copy]) { |
| [_captureSession removeInput:oldInput]; |
| } |
| [_captureSession stopRunning]; |
| |
| #if TARGET_OS_IPHONE |
| [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications]; |
| #endif |
| _isRunning = NO; |
| }]; |
| } |
| |
| #pragma mark iOS notifications |
| |
| #if TARGET_OS_IPHONE |
| - (void)deviceOrientationDidChange:(NSNotification *)notification { |
| [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| [self updateOrientation]; |
| }]; |
| } |
| #endif |
| |
| #pragma mark AVCaptureVideoDataOutputSampleBufferDelegate |
| |
| - (void)captureOutput:(AVCaptureOutput *)captureOutput |
| didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer |
| fromConnection:(AVCaptureConnection *)connection { |
| NSParameterAssert(captureOutput == _videoDataOutput); |
| |
| if (CMSampleBufferGetNumSamples(sampleBuffer) != 1 || !CMSampleBufferIsValid(sampleBuffer) || |
| !CMSampleBufferDataIsReady(sampleBuffer)) { |
| return; |
| } |
| |
| CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); |
| if (pixelBuffer == nil) { |
| return; |
| } |
| |
| #if TARGET_OS_IPHONE |
| // Default to portrait orientation on iPhone. |
| RTCVideoRotation rotation = RTCVideoRotation_90; |
| BOOL usingFrontCamera = NO; |
| // Check the image's EXIF for the camera the image came from as the image could have been |
| // delayed as we set alwaysDiscardsLateVideoFrames to NO. |
| AVCaptureDevicePosition cameraPosition = |
| [AVCaptureSession devicePositionForSampleBuffer:sampleBuffer]; |
| if (cameraPosition != AVCaptureDevicePositionUnspecified) { |
| usingFrontCamera = AVCaptureDevicePositionFront == cameraPosition; |
| } else { |
| AVCaptureDeviceInput *deviceInput = |
| (AVCaptureDeviceInput *)((AVCaptureInputPort *)connection.inputPorts.firstObject).input; |
| usingFrontCamera = AVCaptureDevicePositionFront == deviceInput.device.position; |
| } |
| switch (_orientation) { |
| case UIDeviceOrientationPortrait: |
| rotation = RTCVideoRotation_90; |
| break; |
| case UIDeviceOrientationPortraitUpsideDown: |
| rotation = RTCVideoRotation_270; |
| break; |
| case UIDeviceOrientationLandscapeLeft: |
| rotation = usingFrontCamera ? RTCVideoRotation_180 : RTCVideoRotation_0; |
| break; |
| case UIDeviceOrientationLandscapeRight: |
| rotation = usingFrontCamera ? RTCVideoRotation_0 : RTCVideoRotation_180; |
| break; |
| case UIDeviceOrientationFaceUp: |
| case UIDeviceOrientationFaceDown: |
| case UIDeviceOrientationUnknown: |
| // Ignore. |
| break; |
| } |
| #else |
| // No rotation on Mac. |
| RTCVideoRotation rotation = RTCVideoRotation_0; |
| #endif |
| |
| RTCCVPixelBuffer *rtcPixelBuffer = [[RTCCVPixelBuffer alloc] initWithPixelBuffer:pixelBuffer]; |
| int64_t timeStampNs = CMTimeGetSeconds(CMSampleBufferGetPresentationTimeStamp(sampleBuffer)) * |
| kNanosecondsPerSecond; |
| RTCVideoFrame *videoFrame = [[RTCVideoFrame alloc] initWithBuffer:rtcPixelBuffer |
| rotation:rotation |
| timeStampNs:timeStampNs]; |
| [self.delegate capturer:self didCaptureVideoFrame:videoFrame]; |
| } |
| |
| - (void)captureOutput:(AVCaptureOutput *)captureOutput |
| didDropSampleBuffer:(CMSampleBufferRef)sampleBuffer |
| fromConnection:(AVCaptureConnection *)connection { |
| RTCLogError(@"Dropped sample buffer."); |
| } |
| |
| #pragma mark - AVCaptureSession notifications |
| |
| - (void)handleCaptureSessionInterruption:(NSNotification *)notification { |
| NSString *reasonString = nil; |
| #if defined(__IPHONE_9_0) && defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && \ |
| __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_9_0 |
| if ([UIDevice isIOS9OrLater]) { |
| NSNumber *reason = notification.userInfo[AVCaptureSessionInterruptionReasonKey]; |
| if (reason) { |
| switch (reason.intValue) { |
| case AVCaptureSessionInterruptionReasonVideoDeviceNotAvailableInBackground: |
| reasonString = @"VideoDeviceNotAvailableInBackground"; |
| break; |
| case AVCaptureSessionInterruptionReasonAudioDeviceInUseByAnotherClient: |
| reasonString = @"AudioDeviceInUseByAnotherClient"; |
| break; |
| case AVCaptureSessionInterruptionReasonVideoDeviceInUseByAnotherClient: |
| reasonString = @"VideoDeviceInUseByAnotherClient"; |
| break; |
| case AVCaptureSessionInterruptionReasonVideoDeviceNotAvailableWithMultipleForegroundApps: |
| reasonString = @"VideoDeviceNotAvailableWithMultipleForegroundApps"; |
| break; |
| } |
| } |
| } |
| #endif |
| RTCLog(@"Capture session interrupted: %@", reasonString); |
| } |
| |
| - (void)handleCaptureSessionInterruptionEnded:(NSNotification *)notification { |
| RTCLog(@"Capture session interruption ended."); |
| } |
| |
| - (void)handleCaptureSessionRuntimeError:(NSNotification *)notification { |
| NSError *error = [notification.userInfo objectForKey:AVCaptureSessionErrorKey]; |
| RTCLogError(@"Capture session runtime error: %@", error); |
| |
| [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| #if TARGET_OS_IPHONE |
| if (error.code == AVErrorMediaServicesWereReset) { |
| [self handleNonFatalError]; |
| } else { |
| [self handleFatalError]; |
| } |
| #else |
| [self handleFatalError]; |
| #endif |
| }]; |
| } |
| |
| - (void)handleCaptureSessionDidStartRunning:(NSNotification *)notification { |
| RTCLog(@"Capture session started."); |
| |
| [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| // If we successfully restarted after an unknown error, |
| // allow future retries on fatal errors. |
| _hasRetriedOnFatalError = NO; |
| }]; |
| } |
| |
| - (void)handleCaptureSessionDidStopRunning:(NSNotification *)notification { |
| RTCLog(@"Capture session stopped."); |
| } |
| |
| - (void)handleFatalError { |
| [RTCDispatcher |
| dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| if (!_hasRetriedOnFatalError) { |
| RTCLogWarning(@"Attempting to recover from fatal capture error."); |
| [self handleNonFatalError]; |
| _hasRetriedOnFatalError = YES; |
| } else { |
| RTCLogError(@"Previous fatal error recovery failed."); |
| } |
| }]; |
| } |
| |
| - (void)handleNonFatalError { |
| [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| RTCLog(@"Restarting capture session after error."); |
| if (_isRunning) { |
| [_captureSession startRunning]; |
| } |
| }]; |
| } |
| |
| #if TARGET_OS_IPHONE |
| |
| #pragma mark - UIApplication notifications |
| |
| - (void)handleApplicationDidBecomeActive:(NSNotification *)notification { |
| [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession |
| block:^{ |
| if (_isRunning && !_captureSession.isRunning) { |
| RTCLog(@"Restarting capture session on active."); |
| [_captureSession startRunning]; |
| } |
| }]; |
| } |
| |
| #endif // TARGET_OS_IPHONE |
| |
| #pragma mark - Private |
| |
| - (dispatch_queue_t)frameQueue { |
| if (!_frameQueue) { |
| _frameQueue = |
| dispatch_queue_create("org.webrtc.avfoundationvideocapturer.video", DISPATCH_QUEUE_SERIAL); |
| dispatch_set_target_queue(_frameQueue, |
| dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)); |
| } |
| return _frameQueue; |
| } |
| |
| - (BOOL)setupCaptureSession { |
| NSAssert(_captureSession == nil, @"Setup capture session called twice."); |
| _captureSession = [[AVCaptureSession alloc] init]; |
| #if defined(WEBRTC_IOS) |
| _captureSession.sessionPreset = AVCaptureSessionPresetInputPriority; |
| _captureSession.usesApplicationAudioSession = NO; |
| #endif |
| [self setupVideoDataOutput]; |
| // Add the output. |
| if (![_captureSession canAddOutput:_videoDataOutput]) { |
| RTCLogError(@"Video data output unsupported."); |
| return NO; |
| } |
| [_captureSession addOutput:_videoDataOutput]; |
| |
| return YES; |
| } |
| |
| - (void)setupVideoDataOutput { |
| NSAssert(_videoDataOutput == nil, @"Setup video data output called twice."); |
| AVCaptureVideoDataOutput *videoDataOutput = [[AVCaptureVideoDataOutput alloc] init]; |
| |
| // `videoDataOutput.availableVideoCVPixelFormatTypes` returns the pixel formats supported by the |
| // device with the most efficient output format first. Find the first format that we support. |
| NSSet<NSNumber *> *supportedPixelFormats = [RTCCVPixelBuffer supportedPixelFormats]; |
| NSMutableOrderedSet *availablePixelFormats = |
| [NSMutableOrderedSet orderedSetWithArray:videoDataOutput.availableVideoCVPixelFormatTypes]; |
| [availablePixelFormats intersectSet:supportedPixelFormats]; |
| NSNumber *pixelFormat = availablePixelFormats.firstObject; |
| NSAssert(pixelFormat, @"Output device has no supported formats."); |
| |
| _preferredOutputPixelFormat = [pixelFormat unsignedIntValue]; |
| _outputPixelFormat = _preferredOutputPixelFormat; |
| videoDataOutput.videoSettings = @{(NSString *)kCVPixelBufferPixelFormatTypeKey : pixelFormat}; |
| videoDataOutput.alwaysDiscardsLateVideoFrames = NO; |
| [videoDataOutput setSampleBufferDelegate:self queue:self.frameQueue]; |
| _videoDataOutput = videoDataOutput; |
| } |
| |
| - (void)updateVideoDataOutputPixelFormat:(AVCaptureDeviceFormat *)format { |
| FourCharCode mediaSubType = CMFormatDescriptionGetMediaSubType(format.formatDescription); |
| if (![[RTCCVPixelBuffer supportedPixelFormats] containsObject:@(mediaSubType)]) { |
| mediaSubType = _preferredOutputPixelFormat; |
| } |
| |
| if (mediaSubType != _outputPixelFormat) { |
| _outputPixelFormat = mediaSubType; |
| _videoDataOutput.videoSettings = |
| @{ (NSString *)kCVPixelBufferPixelFormatTypeKey : @(mediaSubType) }; |
| } |
| } |
| |
| #pragma mark - Private, called inside capture queue |
| |
| - (void)updateDeviceCaptureFormat:(AVCaptureDeviceFormat *)format fps:(NSInteger)fps { |
| NSAssert([RTCDispatcher isOnQueueForType:RTCDispatcherTypeCaptureSession], |
| @"updateDeviceCaptureFormat must be called on the capture queue."); |
| @try { |
| _currentDevice.activeFormat = format; |
| _currentDevice.activeVideoMinFrameDuration = CMTimeMake(1, fps); |
| } @catch (NSException *exception) { |
| RTCLogError(@"Failed to set active format!\n User info:%@", exception.userInfo); |
| return; |
| } |
| } |
| |
| - (void)reconfigureCaptureSessionInput { |
| NSAssert([RTCDispatcher isOnQueueForType:RTCDispatcherTypeCaptureSession], |
| @"reconfigureCaptureSessionInput must be called on the capture queue."); |
| NSError *error = nil; |
| AVCaptureDeviceInput *input = |
| [AVCaptureDeviceInput deviceInputWithDevice:_currentDevice error:&error]; |
| if (!input) { |
| RTCLogError(@"Failed to create front camera input: %@", error.localizedDescription); |
| return; |
| } |
| [_captureSession beginConfiguration]; |
| for (AVCaptureDeviceInput *oldInput in [_captureSession.inputs copy]) { |
| [_captureSession removeInput:oldInput]; |
| } |
| if ([_captureSession canAddInput:input]) { |
| [_captureSession addInput:input]; |
| } else { |
| RTCLogError(@"Cannot add camera as an input to the session."); |
| } |
| [_captureSession commitConfiguration]; |
| } |
| |
| - (void)updateOrientation { |
| NSAssert([RTCDispatcher isOnQueueForType:RTCDispatcherTypeCaptureSession], |
| @"updateOrientation must be called on the capture queue."); |
| #if TARGET_OS_IPHONE |
| _orientation = [UIDevice currentDevice].orientation; |
| #endif |
| } |
| |
| @end |
