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我是一位新編程和Objective-C（〜6周），現在我第一次使用AVFoundation。我的目標是適合我的水平，但對於熟悉框架的人來說不應該太難。我無法將AVFoundation視頻保存到本地URL
我的目標是創建一個'Snapchat'風格的自定義相機界面，當您點擊按鈕時捕捉靜止圖像，並在您按住時錄製視頻。
我已經能夠拼湊和粉碎通過大部分的代碼（視頻預覽，拍攝靜止圖像，編程按鈕等），但我不能成功地保存在本地視頻（將在本週晚些時候將其添加到在Parse之上構建的項目）。
ViewController.h （參考）
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface ViewController : UIViewController
@property UIButton *button;
@property UIButton *saveButton;
@property UIImageView *previewView;
#define VIDEO_FILE @"test.mov"
@end
ViewController.m
我已經構造我的代碼是我在初始化第一組方法的會議的方式，然後將圖像和視頻捕獲分解成各自的部分。輸入設備是AVMediaTypeVideo，它分別輸出到AVCaptureStillImageOutput和AVCaptureMovieFileOutput。
#import "ViewController.h"
@interface ViewController() <AVCaptureFileOutputRecordingDelegate>
@end
@implementation ViewController
AVCaptureSession *session;
AVCaptureStillImageOutput *imageOutput;
AVCaptureMovieFileOutput *movieOutput;
AVCaptureConnection *videoConnection;
- (void)viewDidLoad {
[super viewDidLoad];
[self testDevices];
self.view.backgroundColor = [UIColor blackColor];
//Image preview
self.previewView = [[UIImageView alloc]initWithFrame:self.view.frame];
self.previewView.backgroundColor = [UIColor whiteColor];
self.previewView.contentMode = UIViewContentModeScaleAspectFill;
self.previewView.hidden = YES;
[self.view addSubview:self.previewView];
//Buttons
self.button = [self createButtonWithTitle:@"REC" chooseColor:[UIColor redColor]];
UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPressGesture:)];
[self.button addGestureRecognizer:longPressRecognizer];
[self.button addTarget:self action:@selector(captureImage) forControlEvents:UIControlEventTouchUpInside];
self.saveButton = [self createSaveButton];
[self.saveButton addTarget:self action:@selector(saveActions) forControlEvents:UIControlEventTouchUpInside];
}
- (void)viewWillAppear:(BOOL)animated {
//Tests
[self initializeAVItems];
NSLog(@"%@", videoConnection);
NSLog(@"%@", imageOutput.connections);
NSLog(@"%@", imageOutput.description.debugDescription);
}
#pragma mark - AV initialization
- (void)initializeAVItems {
//Start session, input
session = [[AVCaptureSession alloc]init];
[session setSessionPreset:AVCaptureSessionPresetPhoto];
AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error;
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];
if ([session canAddInput:deviceInput]) {
[session addInput:deviceInput];
} else {
NSLog(@"%@", error);
}
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
//Layer preview
CALayer *viewLayer = [[self view] layer];
[viewLayer setMasksToBounds:YES];
CGRect frame = self.view.frame;
[previewLayer setFrame:frame];
[viewLayer insertSublayer:previewLayer atIndex:0];
//Image Output
imageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *imageOutputSettings = [[NSDictionary alloc]initWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
imageOutput.outputSettings = imageOutputSettings;
//Video Output
movieOutput = [[AVCaptureMovieFileOutput alloc] init];
[session addOutput:movieOutput];
[session addOutput:imageOutput];
[session startRunning];
}
- (void)testDevices {
NSArray *devices = [AVCaptureDevice devices];
for (AVCaptureDevice *device in devices) {
NSLog(@"Device name: %@", [device localizedName]);
if ([device hasMediaType:AVMediaTypeVideo]) {
if ([device position] == AVCaptureDevicePositionBack) {
NSLog(@"Device position : back");
}
else {
NSLog(@"Device position : front");
}
}
}
}
#pragma mark - Image capture
- (void)captureImage {
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in imageOutput.connections) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
if (videoConnection) {
break;
}
}
NSLog(@"Requesting capture from: %@", imageOutput);
[imageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *image = [UIImage imageWithData:imageData];
self.previewView.image = image;
self.previewView.hidden = NO;
}
}];
[self saveButtonFlyIn:self.saveButton];
}
#pragma mark - Video capture
- (void)captureVideo {
NSLog(@"%@", movieOutput.connections);
[[NSFileManager defaultManager] removeItemAtURL:[self outputURL] error:nil];
videoConnection = [self connectionWithMediaType:AVMediaTypeVideo fromConnections:movieOutput.connections];
/* This is where the code is breaking */
[movieOutput startRecordingToOutputFileURL:[self outputURL] recordingDelegate:self];
- (AVCaptureConnection *)connectionWithMediaType:(NSString *)mediaType fromConnections:(NSArray *)connections {
for (AVCaptureConnection *connection in connections) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:mediaType]) {
return connection;
}
}
}
return nil;
}
#pragma mark - AVCaptureFileOutputRecordingDelegate
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
if (!error) {
//Do something
} else {
NSLog(@"Error: %@", [error localizedDescription]);
}
}
#pragma mark - Recoding Destination URL
- (NSURL *)outputURL {
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:VIDEO_FILE];
return [NSURL fileURLWithPath:filePath];
}
#pragma mark - Buttons
- (void)handleLongPressGesture:(UILongPressGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateBegan) {
NSLog(@"Press");
self.button.backgroundColor = [UIColor greenColor];
[self captureVideo];
}
if (recognizer.state == UIGestureRecognizerStateEnded) {
NSLog(@"Unpress");
self.button.backgroundColor = [UIColor redColor];
}
}
- (UIButton *)createButtonWithTitle:(NSString *)title chooseColor:(UIColor *)color {
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(self.view.frame.size.width - 100, self.view.frame.size.height - 100, 85, 85)];
button.layer.cornerRadius = button.bounds.size.width/2;
button.backgroundColor = color;
button.tintColor = [UIColor whiteColor];
[self.view addSubview:button];
return button;
}
- (UIButton *)createSaveButton {
UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width, 15, 85, 85)];
button.layer.cornerRadius = button.bounds.size.width/2;
button.backgroundColor = [UIColor greenColor];
button.tintColor = [UIColor whiteColor];
button.userInteractionEnabled = YES;
[button setTitle:@"save" forState:UIControlStateNormal];
[self.view addSubview:button];
return button;
}
- (void)saveButtonFlyIn:(UIButton *)button {
CGRect movement = button.frame;
movement.origin.x = self.view.frame.size.width - 100;
[UIView animateWithDuration:0.2 animations:^{
button.frame = movement;
}];
}
- (void)saveButtonFlyOut:(UIButton *)button {
CGRect movement = button.frame;
movement.origin.x = self.view.frame.size.width;
[UIView animateWithDuration:0.2 animations:^{
button.frame = movement;
}];
}
#pragma mark - Save actions
- (void)saveActions {
[self saveButtonFlyOut:self.saveButton];
self.previewView.image = nil;
self.previewView.hidden = YES;
}
@end
該行的代碼遊：
[movieOutput startRecordingToOutputFileURL:[self outputURL] recordingDelegate:self];
關閉我的頭頂，我想，這可能是一兩件事情：
- 是數據即使在那裏（記錄它，但無法驗證）？
- 我是否正確初始化目標網址？
- 數據是否與目標兼容？那是一件事嗎？
想知道如何檢查，測試或調試它，您會喜歡您的觀點/全新的眼睛/想法。
乾杯， Ĵ
完美，謝謝！這解決了這個問題。感謝您幫助我更好地瞭解AVFoundation。 –