148 lines
5.0 KiB
Objective-C
148 lines
5.0 KiB
Objective-C
//
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// SCCaptureDeviceResolver.m
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// Snapchat
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//
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// Created by Lin Jia on 11/8/17.
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//
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//
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#import "SCCaptureDeviceResolver.h"
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#import "SCCameraTweaks.h"
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#import <SCBase/SCAvailability.h>
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#import <SCFoundation/SCAssertWrapper.h>
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@interface SCCaptureDeviceResolver () {
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AVCaptureDeviceDiscoverySession *_discoverySession;
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}
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@end
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@implementation SCCaptureDeviceResolver
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+ (instancetype)sharedInstance
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{
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static SCCaptureDeviceResolver *resolver;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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resolver = [[SCCaptureDeviceResolver alloc] init];
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});
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return resolver;
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}
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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NSMutableArray *deviceTypes = [[NSMutableArray alloc] init];
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[deviceTypes addObject:AVCaptureDeviceTypeBuiltInWideAngleCamera];
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if (SC_AT_LEAST_IOS_10_2) {
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[deviceTypes addObject:AVCaptureDeviceTypeBuiltInDualCamera];
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}
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// TODO: we should KVO _discoverySession.devices.
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_discoverySession =
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[AVCaptureDeviceDiscoverySession discoverySessionWithDeviceTypes:deviceTypes
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mediaType:AVMediaTypeVideo
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position:AVCaptureDevicePositionUnspecified];
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}
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return self;
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}
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- (AVCaptureDevice *)findAVCaptureDevice:(AVCaptureDevicePosition)position
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{
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SCAssert(position == AVCaptureDevicePositionFront || position == AVCaptureDevicePositionBack, @"");
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AVCaptureDevice *captureDevice;
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if (position == AVCaptureDevicePositionFront) {
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captureDevice = [self _pickBestFrontCamera:[_discoverySession.devices copy]];
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} else if (position == AVCaptureDevicePositionBack) {
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captureDevice = [self _pickBestBackCamera:[_discoverySession.devices copy]];
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}
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if (captureDevice) {
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return captureDevice;
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}
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if (SC_AT_LEAST_IOS_10_2 && SCCameraTweaksEnableDualCamera()) {
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captureDevice = [AVCaptureDevice defaultDeviceWithDeviceType:AVCaptureDeviceTypeBuiltInDualCamera
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mediaType:AVMediaTypeVideo
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position:position];
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if (captureDevice) {
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return captureDevice;
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}
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}
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// if code still execute, discoverSession failed, then we keep searching.
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captureDevice = [AVCaptureDevice defaultDeviceWithDeviceType:AVCaptureDeviceTypeBuiltInWideAngleCamera
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mediaType:AVMediaTypeVideo
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position:position];
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if (captureDevice) {
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return captureDevice;
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}
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#if !TARGET_IPHONE_SIMULATOR
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// We do not return nil at the beginning of the function for simulator, because simulators of different IOS
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// versions can check whether or not our camera device API access is correct.
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SCAssertFail(@"No camera is found.");
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#endif
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return nil;
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}
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- (AVCaptureDevice *)_pickBestFrontCamera:(NSArray<AVCaptureDevice *> *)devices
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{
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for (AVCaptureDevice *device in devices) {
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if (device.position == AVCaptureDevicePositionFront) {
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return device;
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}
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}
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return nil;
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}
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- (AVCaptureDevice *)_pickBestBackCamera:(NSArray<AVCaptureDevice *> *)devices
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{
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// Look for dual camera first if needed. If dual camera not found, continue to look for wide angle camera.
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if (SC_AT_LEAST_IOS_10_2 && SCCameraTweaksEnableDualCamera()) {
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for (AVCaptureDevice *device in devices) {
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if (device.position == AVCaptureDevicePositionBack &&
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device.deviceType == AVCaptureDeviceTypeBuiltInDualCamera) {
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return device;
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}
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}
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}
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for (AVCaptureDevice *device in devices) {
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if (device.position == AVCaptureDevicePositionBack &&
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device.deviceType == AVCaptureDeviceTypeBuiltInWideAngleCamera) {
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return device;
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}
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}
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return nil;
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}
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- (AVCaptureDevice *)findDualCamera
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{
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if (SC_AT_LEAST_IOS_10_2) {
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for (AVCaptureDevice *device in [_discoverySession.devices copy]) {
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if (device.position == AVCaptureDevicePositionBack &&
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device.deviceType == AVCaptureDeviceTypeBuiltInDualCamera) {
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return device;
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}
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}
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}
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AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithDeviceType:AVCaptureDeviceTypeBuiltInDualCamera
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mediaType:AVMediaTypeVideo
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position:AVCaptureDevicePositionBack];
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if (captureDevice) {
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return captureDevice;
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}
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#if !TARGET_IPHONE_SIMULATOR
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// We do not return nil at the beginning of the function for simulator, because simulators of different IOS
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// versions can check whether or not our camera device API access is correct.
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SCAssertFail(@"No camera is found.");
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#endif
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return nil;
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}
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@end
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