今天接到领导任务，要做视频验证类SDK，涉及到视频压缩相关内容。刚接到任务懵逼了一秒，果断想起AVFoundation这个Framework，苹果已经封装好了一系列的视频质量相关的方法，果断调用即可。
首先要导入AVFoundation，并在info.plist文件中添加相应的权限。
创建需要用到的属性
@property (nonatomic, strong) AVCaptureSession *captureSession;
@property (nonatomic, strong) AVCaptureDevice *videoDevice;
@property (nonatomic, strong) AVCaptureDevice *audioDevice;
@property (nonatomic, strong) AVCaptureDeviceInput *videoInput;
@property (nonatomic, strong) AVCaptureDeviceInput *audioInput;
@property (nonatomic, strong) AVCaptureMovieFileOutput *movieFileOutput;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *movieLayer;
视频保存路径，根据需要自己修改
- (NSString *)videoPath {
[self creatSandBoxFilePathIfNoExist];
NSString *pathDocuments = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *videoPath = [NSString stringWithFormat:@"%@/Video", pathDocuments];
return [videoPath stringByAppendingPathComponent:@"test001.mp4"];
}
初始化视频设备
- (void)setupCaptureSession {
// 1.获取视频设备
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices) {
if (device.position == AVCaptureDevicePositionBack) {
self.videoDevice = device; break;
}
}
// 2.获取音频设备
self.audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
// 3.创建视频输入
NSError *error = nil;
self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:self.videoDevice error:&error];
if (error) { return; }
// 4.创建音频输入
self.audioInput = [AVCaptureDeviceInput deviceInputWithDevice:self.audioDevice error:&error];
if (error) { return; }
// 5.创建视频输出
self.movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
// 6.建立会话
self.captureSession = [[AVCaptureSession alloc] init]; self.captureSession.sessionPreset = AVCaptureSessionPresetMedium;
if ([self.captureSession canAddInput:self.videoInput]) {
[self.captureSession addInput:self.videoInput];
}
if ([self.captureSession canAddInput:self.audioInput]) {
[self.captureSession addInput:self.audioInput];
}
if ([self.captureSession canAddOutput:self.movieFileOutput]) {
[self.captureSession addOutput:self.movieFileOutput];
}
// 7.预览画面
self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
[self.view.layer addSublayer:self.movieLayer];
}
其中self.captureSession.sessionPreset = AVCaptureSessionPresetMedium;是用来调节视频质量的，苹果定义好了很多不同的尺寸和质量，选择自己需要的就好。
之后调用startRunning即可看见预览的界面。
- (void)startSession {
if(![self.captureSession isRunning]) {
[self.captureSession startRunning];
}
}
- (void)stopSession {
if([self.captureSession isRunning]) {
[self.captureSession stopRunning];
}
}
记得自定义拍摄按钮
- (void)startRecord {
[self.movieFileOutput startRecordingToOutputFileURL:[NSURL fileURLWithPath:[self videoPath]] recordingDelegate:self];
}
- (void)stopRecord {
if ([self.movieFileOutput isRecording]) {
[self.movieFileOutput stopRecording];
}
}
要获取视频路径，需要实现代理方法
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
NSLog(@"vedioOutPut--->%@",outputFileURL);
}
到此，就可以获取视频保存的路径了。当然也可以使用
UISaveVideoAtPathToSavedPhotosAlbum([outputFileURL path], nil, nil, nil);
将视频保存至用户相册中。
