SDVideoCamera 前置摄像头颠倒问题
2020-09-14 本文已影响0人
H丶ym
// 处理视频尺寸大小
+ (void)changeVideoSizeWithAsset:(AVAsset *)asset passThroughLayer:(AVMutableVideoCompositionLayerInstruction *)passThroughLayer {
AVAssetTrack *videoAssetTrack = [asset tracksWithMediaType:AVMediaTypeVideo].firstObject;
if(videoAssetTrack ==nil) {
return;
}
CGSizenaturalSize = videoAssetTrack.naturalSize;
STVideoOrientation * t = [STVideoUtils videoDegressWithVideoAsset:asset];
if(t.videoDegress==90) {
naturalSize =CGSizeMake(naturalSize.height, naturalSize.width);
}
if((int)naturalSize.width%2!=0) {
naturalSize =CGSizeMake(naturalSize.width+1.0, naturalSize.height);
}
CGSizevideoSize =STVideoSize;
if(t.videoDegress==90) {
if (t.position == AVCaptureDevicePositionFront){
CGAffineTransformtransform =CGAffineTransformIdentity;
CGFloatheight = videoSize.width* naturalSize.height/ naturalSize.width;
transform =CGAffineTransformScale(transform, videoSize.width/naturalSize.width* -1, height/naturalSize.height);
transform =CGAffineTransformRotate(transform,M_PI_2);
[passThroughLayersetTransform:transformatTime:kCMTimeZero];
}else{
CGFloatheight = videoSize.width* naturalSize.height/ naturalSize.width;
CGAffineTransformtranslateToCenter =CGAffineTransformMakeTranslation(videoSize.width, videoSize.height/2.0- height/2.0);
CGAffineTransformscaleTransform =CGAffineTransformScale(translateToCenter, videoSize.width/naturalSize.width, height/naturalSize.height);
CGAffineTransformmixedTransform =CGAffineTransformRotate(scaleTransform,M_PI_2);
[passThroughLayersetTransform:mixedTransformatTime:kCMTimeZero];
}
}else{
CGFloatheight = videoSize.width* naturalSize.height/ naturalSize.width;
CGAffineTransformtranslateToCenter =CGAffineTransformMakeTranslation(0, videoSize.height/2.0- height/2.0);
CGAffineTransformscaleTransform =CGAffineTransformScale(translateToCenter, videoSize.width/naturalSize.width, height/naturalSize.height);
[passThroughLayersetTransform:scaleTransformatTime:kCMTimeZero];
}
}
// 计算视频角度
+ (STVideoOrientation *)videoDegressWithVideoAsset:(AVAsset *)videoAsset {
NSIntegervideoDegress =0;
AVCaptureDevicePosition device = AVCaptureDevicePositionUnspecified;
STVideoOrientation * t = [[STVideoOrientation alloc] init];
NSArray*assetVideoTracks = [videoAssettracksWithMediaType:AVMediaTypeVideo];
if(assetVideoTracks.count>0) {
AVAssetTrack*videoTrack = assetVideoTracks.firstObject;
CGAffineTransformaffineTransform = videoTrack.preferredTransform;
if(affineTransform.a==0&& affineTransform.b==1.0&& affineTransform.d==0){
videoDegress =90;
if(affineTransform.c==1.0){
device =AVCaptureDevicePositionFront;
}else{
device =AVCaptureDevicePositionBack;
}
}elseif(affineTransform.a==0&& affineTransform.b== -1.0&& affineTransform.d==0){
videoDegress =270;
if(affineTransform.c==1.0){
device =AVCaptureDevicePositionBack;
}else{
device =AVCaptureDevicePositionFront;
}
}elseif(affineTransform.a==1.0&& affineTransform.b==0&& affineTransform.c==0){
videoDegress =0;
if(affineTransform.c==1.0){
device =AVCaptureDevicePositionBack;
}else{
device =AVCaptureDevicePositionFront;
}
}elseif(affineTransform.a== -1.0&& affineTransform.b==0&& affineTransform.c==0){
videoDegress =180;
if(affineTransform.c==1.0){
device =AVCaptureDevicePositionFront;
}else{
device =AVCaptureDevicePositionBack;
}
}
t.position= device;
t.videoDegress= videoDegress;
}
returnt;
}
