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NekoX/TMessagesProj/jni/voip/tgcalls/platform/darwin/VideoCameraCapturerMac.mm

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#include "VideoCameraCapturerMac.h"
#import <AVFoundation/AVFoundation.h>
#import "TGRTCCVPixelBuffer.h"
#include "rtc_base/logging.h"
#import "base/RTCLogging.h"
#import "base/RTCVideoFrameBuffer.h"
#import "components/video_frame_buffer/RTCCVPixelBuffer.h"
#import "sdk/objc/native/src/objc_video_track_source.h"
#import "sdk/objc/native/src/objc_frame_buffer.h"
#import "api/video_track_source_proxy.h"
#import "helpers/AVCaptureSession+DevicePosition.h"
#import "helpers/RTCDispatcher+Private.h"
#import "base/RTCVideoFrame.h"
#include "common_video/libyuv/include/webrtc_libyuv.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "third_party/libyuv/include/libyuv.h"
static const int64_t kNanosecondsPerSecond = 1000000000;
static webrtc::ObjCVideoTrackSource *getObjCVideoSource(const rtc::scoped_refptr<webrtc::VideoTrackSourceInterface> nativeSource) {
webrtc::VideoTrackSourceProxy *proxy_source =
static_cast<webrtc::VideoTrackSourceProxy *>(nativeSource.get());
return static_cast<webrtc::ObjCVideoTrackSource *>(proxy_source->internal());
}
@interface RTCCVPixelBuffer (CustomCropping)
@end
@implementation RTCCVPixelBuffer (CustomCropping)
- (BOOL)custom_cropAndScaleTo:(CVPixelBufferRef)outputPixelBuffer
withTempBuffer:(nullable uint8_t*)tmpBuffer {
const OSType srcPixelFormat = CVPixelBufferGetPixelFormatType(self.pixelBuffer);
const OSType dstPixelFormat = CVPixelBufferGetPixelFormatType(outputPixelBuffer);
switch (srcPixelFormat) {
case kCVPixelFormatType_420YpCbCr8BiPlanarFullRange:
case kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange: {
size_t dstWidth = CVPixelBufferGetWidth(outputPixelBuffer);
size_t dstHeight = CVPixelBufferGetHeight(outputPixelBuffer);
if (dstWidth > 0 && dstHeight > 0) {
RTC_DCHECK(dstPixelFormat == kCVPixelFormatType_420YpCbCr8BiPlanarFullRange ||
dstPixelFormat == kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange);
if ([self requiresScalingToWidth:(int)dstWidth height:(int)dstHeight]) {
RTC_DCHECK(tmpBuffer);
}
[self custom_cropAndScaleNV12To:outputPixelBuffer withTempBuffer:tmpBuffer];
}
break;
}
case kCVPixelFormatType_32BGRA:
case kCVPixelFormatType_32ARGB: {
RTC_DCHECK(srcPixelFormat == dstPixelFormat);
[self custom_cropAndScaleARGBTo:outputPixelBuffer];
break;
}
default: { RTC_NOTREACHED() << "Unsupported pixel format."; }
}
return YES;
}
- (void)custom_cropAndScaleNV12To:(CVPixelBufferRef)outputPixelBuffer withTempBuffer:(uint8_t*)tmpBuffer {
// Prepare output pointers.
CVReturn cvRet = CVPixelBufferLockBaseAddress(outputPixelBuffer, 0);
if (cvRet != kCVReturnSuccess) {
RTC_LOG(LS_ERROR) << "Failed to lock base address: " << cvRet;
}
const int dstWidth = (int)CVPixelBufferGetWidth(outputPixelBuffer);
const int dstHeight = (int)CVPixelBufferGetHeight(outputPixelBuffer);
uint8_t* dstY =
reinterpret_cast<uint8_t*>(CVPixelBufferGetBaseAddressOfPlane(outputPixelBuffer, 0));
const int dstYStride = (int)CVPixelBufferGetBytesPerRowOfPlane(outputPixelBuffer, 0);
uint8_t* dstUV =
reinterpret_cast<uint8_t*>(CVPixelBufferGetBaseAddressOfPlane(outputPixelBuffer, 1));
const int dstUVStride = (int)CVPixelBufferGetBytesPerRowOfPlane(outputPixelBuffer, 1);
// Prepare source pointers.
CVPixelBufferLockBaseAddress(self.pixelBuffer, kCVPixelBufferLock_ReadOnly);
const uint8_t* srcY = static_cast<uint8_t*>(CVPixelBufferGetBaseAddressOfPlane(self.pixelBuffer, 0));
const int srcYStride = (int)CVPixelBufferGetBytesPerRowOfPlane(self.pixelBuffer, 0);
const uint8_t* srcUV = static_cast<uint8_t*>(CVPixelBufferGetBaseAddressOfPlane(self.pixelBuffer, 1));
const int srcUVStride = (int)CVPixelBufferGetBytesPerRowOfPlane(self.pixelBuffer, 1);
// Crop just by modifying pointers.
srcY += srcYStride * self.cropY + self.cropX;
srcUV += srcUVStride * (self.cropY / 2) + self.cropX;
webrtc::NV12Scale(tmpBuffer,
srcY,
srcYStride,
srcUV,
srcUVStride,
self.cropWidth,
self.cropHeight,
dstY,
dstYStride,
dstUV,
dstUVStride,
dstWidth,
dstHeight);
CVPixelBufferUnlockBaseAddress(self.pixelBuffer, kCVPixelBufferLock_ReadOnly);
CVPixelBufferUnlockBaseAddress(outputPixelBuffer, 0);
}
- (void)custom_cropAndScaleARGBTo:(CVPixelBufferRef)outputPixelBuffer {
// Prepare output pointers.
CVReturn cvRet = CVPixelBufferLockBaseAddress(outputPixelBuffer, 0);
if (cvRet != kCVReturnSuccess) {
RTC_LOG(LS_ERROR) << "Failed to lock base address: " << cvRet;
}
const int dstWidth = (int)CVPixelBufferGetWidth(outputPixelBuffer);
const int dstHeight = (int)CVPixelBufferGetHeight(outputPixelBuffer);
uint8_t* dst = reinterpret_cast<uint8_t*>(CVPixelBufferGetBaseAddress(outputPixelBuffer));
const int dstStride = (int)CVPixelBufferGetBytesPerRow(outputPixelBuffer);
// Prepare source pointers.
CVPixelBufferLockBaseAddress(self.pixelBuffer, kCVPixelBufferLock_ReadOnly);
const uint8_t* src = static_cast<uint8_t*>(CVPixelBufferGetBaseAddress(self.pixelBuffer));
const int srcStride = (int)CVPixelBufferGetBytesPerRow(self.pixelBuffer);
// Crop just by modifying pointers. Need to ensure that src pointer points to a byte corresponding
// to the start of a new pixel (byte with B for BGRA) so that libyuv scales correctly.
const int bytesPerPixel = 4;
src += srcStride * self.cropY + (self.cropX * bytesPerPixel);
// kCVPixelFormatType_32BGRA corresponds to libyuv::FOURCC_ARGB
libyuv::ARGBScale(src,
srcStride,
self.cropWidth,
self.cropHeight,
dst,
dstStride,
dstWidth,
dstHeight,
libyuv::kFilterBox);
CVPixelBufferUnlockBaseAddress(self.pixelBuffer, kCVPixelBufferLock_ReadOnly);
CVPixelBufferUnlockBaseAddress(outputPixelBuffer, 0);
}
@end
@interface VideoCameraCapturer () <AVCaptureVideoDataOutputSampleBufferDelegate> {
rtc::scoped_refptr<webrtc::VideoTrackSourceInterface> _source;
dispatch_queue_t _frameQueue;
AVCaptureDevice *_currentDevice;
// Live on RTCDispatcherTypeCaptureSession.
BOOL _hasRetriedOnFatalError;
BOOL _isRunning;
// Live on RTCDispatcherTypeCaptureSession and main thread.
std::atomic<bool> _willBeRunning;
AVCaptureVideoDataOutput *_videoDataOutput;
AVCaptureSession *_captureSession;
AVCaptureConnection *_videoConnection;
AVCaptureDevice *_videoDevice;
AVCaptureDeviceInput *_videoInputDevice;
FourCharCode _preferredOutputPixelFormat;
FourCharCode _outputPixelFormat;
RTCVideoRotation _rotation;
// Live on mainThread.
void (^_isActiveUpdated)(bool);
bool _isActiveValue;
bool _inForegroundValue;
// Live on frameQueue and main thread.
std::atomic<bool> _isPaused;
std::atomic<int> _skippedFrame;
// Live on frameQueue;
float _aspectRatio;
std::vector<uint8_t> _croppingBuffer;
std::shared_ptr<rtc::VideoSinkInterface<webrtc::VideoFrame>> _uncroppedSink;
int _warmupFrameCount;
}
@end
@implementation VideoCameraCapturer
- (instancetype)initWithSource:(rtc::scoped_refptr<webrtc::VideoTrackSourceInterface>)source isActiveUpdated:(void (^)(bool))isActiveUpdated {
self = [super init];
if (self != nil) {
_source = source;
_isActiveUpdated = [isActiveUpdated copy];
_isActiveValue = true;
_inForegroundValue = true;
_isPaused = false;
_skippedFrame = 0;
_rotation = RTCVideoRotation_0;
_warmupFrameCount = 100;
if (![self setupCaptureSession:[[AVCaptureSession alloc] init]]) {
return nil;
}
}
return self;
}
- (void)dealloc {
NSAssert(!_willBeRunning, @"Session was still running in RTCCameraVideoCapturer dealloc. Forgot to call stopCapture?");
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
+ (NSArray<AVCaptureDevice *> *)captureDevices {
AVCaptureDevice * defaultDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSMutableArray<AVCaptureDevice *> * devices = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] mutableCopy];
[devices insertObject:defaultDevice atIndex:0];
return devices;
}
- (BOOL)deviceIsCaptureCompitable:(AVCaptureDevice *)device {
if (![device isConnected] || [device isSuspended]) {
return NO;
}
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
return [_captureSession canAddInput:input];
}
+ (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 {
[self startCaptureWithDevice:device format:format fps:fps completionHandler:nil];
}
- (void)stopCapture {
_isActiveUpdated = nil;
[self stopCaptureWithCompletionHandler:nil];
}
- (void)setIsEnabled:(bool)isEnabled {
BOOL updated = _isPaused != !isEnabled;
_isPaused = !isEnabled;
_skippedFrame = 0;
if (updated) {
if (_isPaused) {
[RTCDispatcher
dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
[self->_captureSession stopRunning];
self->_isRunning = NO;
}];
} else {
[RTCDispatcher
dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
[self->_captureSession startRunning];
self->_isRunning = YES;
}];
}
}
[self updateIsActiveValue];
}
- (void)setUncroppedSink:(std::shared_ptr<rtc::VideoSinkInterface<webrtc::VideoFrame>>)sink {
dispatch_async(self.frameQueue, ^{
_uncroppedSink = sink;
});
}
- (void)setPreferredCaptureAspectRatio:(float)aspectRatio {
dispatch_async(self.frameQueue, ^{
_aspectRatio = MAX(0.7, aspectRatio);
});
}
- (void)updateIsActiveValue {
bool isActive = _inForegroundValue && !_isPaused;
if (isActive != _isActiveValue) {
_isActiveValue = isActive;
if (_isActiveUpdated) {
_isActiveUpdated(_isActiveValue);
}
}
}
- (void)startCaptureWithDevice:(AVCaptureDevice *)device
format:(AVCaptureDeviceFormat *)format
fps:(NSInteger)fps
completionHandler:(nullable void (^)(NSError *))completionHandler {
_willBeRunning = true;
[RTCDispatcher
dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
RTCLogInfo("startCaptureWithDevice %@ @ %ld fps", format, (long)fps);
self->_currentDevice = device;
NSError *error = nil;
if (![self->_currentDevice lockForConfiguration:&error]) {
RTCLogError(@"Failed to lock device %@. Error: %@",
self->_currentDevice,
error.userInfo);
if (completionHandler) {
completionHandler(error);
}
self->_willBeRunning = false;
return;
}
[self reconfigureCaptureSessionInput];
[self updateDeviceCaptureFormat:format fps:fps];
[self updateVideoDataOutputPixelFormat:format];
[self->_captureSession startRunning];
[self->_currentDevice unlockForConfiguration];
self->_isRunning = YES;
if (completionHandler) {
completionHandler(nil);
}
}];
}
- (void)stopCaptureWithCompletionHandler:(nullable void (^)(void))completionHandler {
_willBeRunning = false;
[RTCDispatcher
dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
RTCLogInfo("Stop");
self->_currentDevice = nil;
for (AVCaptureDeviceInput *oldInput in [self->_captureSession.inputs copy]) {
[self->_captureSession removeInput:oldInput];
}
[self->_captureSession stopRunning];
self->_isRunning = NO;
if (completionHandler) {
completionHandler();
}
}];
}
#pragma mark AVCaptureVideoDataOutputSampleBufferDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection {
NSParameterAssert(captureOutput == _videoDataOutput);
int minWarmupFrameCount = 12;
_warmupFrameCount++;
if (_warmupFrameCount < minWarmupFrameCount) {
return;
}
if (CMSampleBufferGetNumSamples(sampleBuffer) != 1 || !CMSampleBufferIsValid(sampleBuffer) ||
!CMSampleBufferDataIsReady(sampleBuffer)) {
return;
}
CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
if (pixelBuffer == nil) {
return;
}
TGRTCCVPixelBuffer *rtcPixelBuffer = [[TGRTCCVPixelBuffer alloc] initWithPixelBuffer:pixelBuffer];
rtcPixelBuffer.shouldBeMirrored = YES;
if (_aspectRatio > 0.001) {
const auto originalWidth = rtcPixelBuffer.width;
const auto originalHeight = rtcPixelBuffer.height;
auto width = (originalWidth > _aspectRatio * originalHeight)
? int(std::round(_aspectRatio * originalHeight))
: originalWidth;
auto height = (originalWidth > _aspectRatio * originalHeight)
? originalHeight
: int(std::round(originalHeight / _aspectRatio));
if ((width < originalWidth || height < originalHeight) && width && height) {
width &= ~int(1);
height &= ~int(1);
const auto left = (originalWidth - width) / 2;
const auto top = (originalHeight - height) / 2;
rtcPixelBuffer = [[TGRTCCVPixelBuffer alloc] initWithPixelBuffer:pixelBuffer adaptedWidth:width adaptedHeight:height cropWidth:width cropHeight:height cropX:left cropY:top];
rtcPixelBuffer.shouldBeMirrored = YES;
CVPixelBufferRef outputPixelBufferRef = NULL;
OSType pixelFormat = CVPixelBufferGetPixelFormatType(rtcPixelBuffer.pixelBuffer);
CVPixelBufferCreate(NULL, width, height, pixelFormat, NULL, &outputPixelBufferRef);
if (outputPixelBufferRef) {
int bufferSize = [rtcPixelBuffer bufferSizeForCroppingAndScalingToWidth:width height:width];
if (_croppingBuffer.size() < bufferSize) {
_croppingBuffer.resize(bufferSize);
}
if ([rtcPixelBuffer cropAndScaleTo:outputPixelBufferRef withTempBuffer:_croppingBuffer.data()]) {
rtcPixelBuffer = [[TGRTCCVPixelBuffer alloc] initWithPixelBuffer:outputPixelBufferRef];
rtcPixelBuffer.shouldBeMirrored = YES;
}
CVPixelBufferRelease(outputPixelBufferRef);
}
}
}
if (!_isPaused && _uncroppedSink) {
int64_t timeStampNs = CMTimeGetSeconds(CMSampleBufferGetPresentationTimeStamp(sampleBuffer)) *
kNanosecondsPerSecond;
RTCVideoFrame *frame = [[RTCVideoFrame alloc] initWithBuffer:rtcPixelBuffer
rotation:_rotation
timeStampNs:timeStampNs];
const int64_t timestamp_us = frame.timeStampNs / rtc::kNumNanosecsPerMicrosec;
rtc::scoped_refptr<webrtc::VideoFrameBuffer> buffer;
buffer = new rtc::RefCountedObject<webrtc::ObjCFrameBuffer>(frame.buffer);
webrtc::VideoRotation rotation = static_cast<webrtc::VideoRotation>(frame.rotation);
_uncroppedSink->OnFrame(webrtc::VideoFrame::Builder()
.set_video_frame_buffer(buffer)
.set_rotation(rotation)
.set_timestamp_us(timestamp_us)
.build());
}
int64_t timeStampNs = CMTimeGetSeconds(CMSampleBufferGetPresentationTimeStamp(sampleBuffer)) *
kNanosecondsPerSecond;
RTCVideoFrame *videoFrame = [[RTCVideoFrame alloc] initWithBuffer:rtcPixelBuffer
rotation:_rotation
timeStampNs:timeStampNs];
if (!_isPaused) {
getObjCVideoSource(_source)->OnCapturedFrame(videoFrame);
}
_skippedFrame = MIN(_skippedFrame + 1, 16);
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didDropSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection {
NSString *droppedReason =
(__bridge NSString *)CMGetAttachment(sampleBuffer, kCMSampleBufferAttachmentKey_DroppedFrameReason, nil);
RTCLogError(@"Dropped sample buffer. Reason: %@", droppedReason);
}
#pragma mark - AVCaptureSession notifications
- (void)handleCaptureSessionInterruption:(NSNotification *)notification {
}
- (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:^{
[self handleFatalError];
}];
}
- (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.
self->_hasRetriedOnFatalError = NO;
}];
_inForegroundValue = true;
[self updateIsActiveValue];
}
- (void)handleCaptureSessionDidStopRunning:(NSNotification *)notification {
RTCLog(@"Capture session stopped.");
_inForegroundValue = false;
[self updateIsActiveValue];
}
- (void)handleFatalError {
[RTCDispatcher
dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
if (!self->_hasRetriedOnFatalError) {
RTCLogWarning(@"Attempting to recover from fatal capture error.");
[self handleNonFatalError];
self->_warmupFrameCount = 0;
self->_hasRetriedOnFatalError = YES;
} else {
RTCLogError(@"Previous fatal error recovery failed.");
}
}];
}
- (void)handleNonFatalError {
[RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
RTCLog(@"Restarting capture session after error.");
if (self->_isRunning) {
self->_warmupFrameCount = 0;
[self->_captureSession startRunning];
}
}];
}
#pragma mark - UIApplication notifications
- (void)handleApplicationDidBecomeActive:(NSNotification *)notification {
[RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
block:^{
if (self->_isRunning && !self->_captureSession.isRunning) {
RTCLog(@"Restarting capture session on active.");
self->_warmupFrameCount = 0;
[self->_captureSession startRunning];
}
}];
}
#pragma mark - Private
- (dispatch_queue_t)frameQueue {
if (!_frameQueue) {
_frameQueue =
dispatch_queue_create("org.webrtc.cameravideocapturer.video", DISPATCH_QUEUE_SERIAL);
dispatch_set_target_queue(_frameQueue,
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0));
}
return _frameQueue;
}
- (BOOL)setupCaptureSession:(AVCaptureSession *)captureSession {
NSAssert(_captureSession == nil, @"Setup capture session called twice.");
_captureSession = captureSession;
[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) };
}
AVCaptureConnection *connection = [_videoDataOutput connectionWithMediaType:AVMediaTypeVideo];
if ([connection isVideoMirroringSupported]) {
[connection setVideoMirrored:YES];
}
}
#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, (int32_t)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];
}
@end
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