实例化方法：
+ (WKMovieRecorder *)sharedRecorder
{
static WKMovieRecorder *recorder;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
recorder = [[WKMovieRecorder alloc] initWithMaxDuration:CGFLOAT_MAX];
});
return recorder;
}
- (instancetype)initWithMaxDuration:(NSTimeInterval)duration
{
if(self = [self init]){
_maxDuration = duration;
_duration = 0.f;
}
return self;
}
- (instancetype)init
{
self = [super init];
if (self) {
_maxDuration = CGFLOAT_MAX;
_duration = 0.f;
_sessionQueue = dispatch_queue_create("wukong.movieRecorder.queue", DISPATCH_QUEUE_SERIAL );
_videoDataOutputQueue = dispatch_queue_create( "wukong.movieRecorder.video", DISPATCH_QUEUE_SERIAL );
dispatch_set_target_queue( _videoDataOutputQueue, dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_HIGH, 0 ) );
}
return self;
}
2.初始化设置
初始化设置分别为session创建、权限检查以及session配置
1）.session创建
self.session = [[AVCaptureSession alloc] init];
self.result = CaptureAVSetupResultSuccess;
2）.权限检查
//权限检查
switch ([AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo]) {
case AVAuthorizationStatusNotDetermined: {
[AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
if (granted) {
self.result = CaptureAVSetupResultSuccess;
}
}];
break;
}
case AVAuthorizationStatusAuthorized: {
break;
}
default:{
self.result = CaptureAVSetupResultCameraNotAuthorized;
}
}
if ( self.result != CaptureAVSetupResultSuccess) {
if (self.authorizationResultBlock) {
self.authorizationResultBlock(NO);
}
return;
}
3）.session配置
session配置是需要注意的是AVCaptureSession的配置不能在主线程, 需要自行创建串行线程。
3.1.1 获取输入设备与输入流
AVCaptureDevice *captureDevice = [[self class] deviceWithMediaType:AVMediaTypeVideo preferringPosition:AVCaptureDevicePositionBack];
_captureDevice = captureDevice;
NSError *error = nil;
_videoDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:captureDevice error:&error];
if (!_videoDeviceInput) {
NSLog(@"未找到设备");
}
3.1.2 录制帧数设置
帧数设置的主要目的是适配iPhone4，毕竟是应该淘汰的机器了
int frameRate;
if ( [NSProcessInfo processInfo].processorCount == 1 )
{
if ([self.session canSetSessionPreset:AVCaptureSessionPresetLow]) {
[self.session setSessionPreset:AVCaptureSessionPresetLow];
}
frameRate = 10;
}else{
if ([self.session canSetSessionPreset:AVCaptureSessionPreset640x480]) {
[self.session setSessionPreset:AVCaptureSessionPreset640x480];
}
frameRate = 30;
}
CMTime frameDuration = CMTimeMake( 1, frameRate );
if ( [_captureDevice lockForConfiguration:&error] ) {
_captureDevice.activeVideoMaxFrameDuration = frameDuration;
_captureDevice.activeVideoMinFrameDuration = frameDuration;
[_captureDevice unlockForConfiguration];
}
else {
NSLog( @"videoDevice lockForConfiguration returned error %@", error );
}
