我正在使用AVFoundation's AVCaptureSession来捕获视频，并且正在使用MPMoviePlayerController从服务器播放流式传输的 url（视频）。当我只捕获视频时AVCaptureSession没有问题。但是，当我尝试播放流式传输的 url(with MPMoviePlayerController) 以及一次捕获视频AVCaptureSession时，会出现问题，因为从AVCaptureSession停止捕获。
这就是我所做的：
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication ]delegate];
if([appDelegate isIpad] == YES)
controlsView = [[UIView alloc] initWithFrame:CGRectMake(self.view.bounds.origin.x+200, self.view.bounds.origin.y+250, self.view.bounds.size.width, self.view.bounds.size.height)];
else
controlsView = [[UIView alloc] initWithFrame:self.view.bounds];
controlsView.backgroundColor = [UIColor blackColor];
[self.view addSubview:controlsView];
[self.view sendSubviewToBack:controlsView];
//settingsBtn = [[UIButton alloc]initWithFrame:CGRectMake(10,400, 50, 50)];
settingsBtn = [[UIButton alloc]initWithFrame:CGRectMake(10,400, 50, 50)];
[settingsBtn setImage:[UIImage imageNamed:@"settings.png"] forState:UIControlStateNormal];
[settingsBtn addTarget:self action:@selector(settingsAction) forControlEvents:UIControlEventTouchUpInside];
[controlsView addSubview:settingsBtn];
callButton = [[UIButton alloc]initWithFrame:CGRectMake(260,400, 50, 50)];
if(isCallButtonClicked ==NO)
[callButton setImage:[UIImage imageNamed:@"call.png"] forState:UIControlStateNormal];
else
[callButton setImage:[UIImage imageNamed:@"callEnd.png"] forState:UIControlStateNormal];
[callButton addTarget:self action:@selector(callAction) forControlEvents:UIControlEventTouchUpInside];
[controlsView addSubview:callButton];
statusLabel = [[UILabel alloc]initWithFrame:CGRectMake(120, 20, 150, 40)];
statusLabel.textColor = [UIColor whiteColor];
statusLabel.backgroundColor = [UIColor clearColor];
statusLabel.textAlignment = UITextAlignmentLeft;
statusLabel.font = [UIFont boldSystemFontOfSize:20];
dot1 = [[UIView alloc] initWithFrame:CGRectMake(75, 20, 7, 7)];
dot1.layer.cornerRadius = 5;
dot1.backgroundColor = [UIColor whiteColor];
[statusLabel addSubview:dot1];
dot2 = [[UIView alloc] initWithFrame:CGRectMake(84, 20, 7, 7)];
dot2.layer.cornerRadius = 5;
dot2.backgroundColor = [UIColor whiteColor];
[statusLabel addSubview:dot2];
dot3 = [[UIView alloc] initWithFrame:CGRectMake(93, 20, 7, 7)];
dot3.layer.cornerRadius = 5;
dot3.backgroundColor = [UIColor whiteColor];
[statusLabel addSubview:dot3];
downStreamView = [[UIView alloc]initWithFrame:CGRectMake(controlsView.bounds.origin.x, controlsView.bounds.origin.y, controlsView.bounds.size.width, controlsView.bounds.size.height - 70)];
[[controlsView layer] addSublayer:downStreamView.layer];
downStreamView.layer.backgroundColor = [UIColor greenColor].CGColor;
AVCaptureSession *captureSession = [[AVCaptureSession alloc]init];
NSError *error;
/* getting the device input */
AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:[self frontFacingCamera] error:&error];
if(error)
{
NSLog(@"%@",@"Could not create video input");
}
[captureSession addInput:videoInput];
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:[self audioDevice] error:&error];
[captureSession addInput:audioInput];
audioOutput = [[AVCaptureAudioDataOutput alloc]init];
[captureSession addOutput:audioOutput];
previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:captureSession];
[previewLayer setFrame:CGRectMake(controlsView.bounds.origin.x, controlsView.bounds.origin.y, controlsView.bounds.size.width, controlsView.bounds.size.height - 70)];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[[controlsView layer] addSublayer:previewLayer];
[captureSession startRunning];
}
//make call Action
-(void)makeCallAction
{
if(isCallButtonClicked == NO)
{
statusLabel.text = @"Dialling";
[controlsView addSubview:statusLabel];
if(!isAnimationStarted)
[self animate];
[callButton setImage:[UIImage imageNamed:@"callEnd.png"] forState:UIControlStateNormal];
[UIView animateWithDuration:2.0
animations:^{
CGRect frame = CGRectMake(downStreamView.layer.bounds.origin.x, downStreamView.layer.bounds.size.height-100, 100, 100);
previewLayer.frame = frame;
[downStreamView.layer addSublayer:previewLayer];
}
completion:^(BOOL finished){
//Do nothing
}];
isCallButtonClicked = YES;
}
else if(isCallButtonClicked == YES)
{
[statusLabel removeFromSuperview];
[callButton setImage:[UIImage imageNamed:@"call.png"] forState:UIControlStateNormal];
[UIView animateWithDuration:2.0
animations:^{
[previewLayer setFrame:CGRectMake(controlsView.bounds.origin.x, controlsView.bounds.origin.y, controlsView.bounds.size.width, controlsView.bounds.size.height - 70)];
[[controlsView layer] addSublayer:previewLayer];
}
completion:^(BOOL finished){
//Do nothing
}];
isCallButtonClicked = NO;
}
}
//Settings Action
-(void)settingsAction
{
NSString *nibName = nil;
if ([[[UIDevice currentDevice] model] isEqualToString:@"iPhone"] || [[[UIDevice currentDevice] model] isEqualToString:@"iPhone Simulator"]) {
nibName = @"SettingsViewController";
}
else {
nibName = @"SettingsViewController_iPad";
}
SettingsViewController *settingsController = [[SettingsViewController alloc]initWithNibName:nibName bundle:nil];
[self.navigationController presentModalViewController:settingsController animated:YES];
}
-(void)callAction
{
NSURL *theMovieURL = [NSURL URLWithString:@"someURL.m3u8"];
if (theMovieURL)
{
if ([theMovieURL scheme]) // sanity check on the URL
{
/* Play the movie with the specified URL. */
[self playStreamingURL:theMovieURL];
}
}
[self makeCallAction];
}
-(void)playStreamingURL:(NSURL *)aUrlStr
{
MPMovieSourceType movieSourceType = MPMovieSourceTypeUnknown;
/* If we have a streaming url then specify the movie source type. */
if ([[aUrlStr pathExtension] compare:@"m3u8" options:NSCaseInsensitiveSearch] == NSOrderedSame)
{
movieSourceType = MPMovieSourceTypeStreaming;
}
[self createAndPlayMovieForURL:aUrlStr sourceType:movieSourceType];
}
-(void)createAndPlayMovieForURL:(NSURL *)movieURL sourceType:(MPMovieSourceType)sourceType
{
[self createAndConfigurePlayerWithURL:movieURL sourceType:sourceType];
/* making the player to be visible in full screen mode */
//if(!self.moviePlayerController.fullscreen)
// self.moviePlayerController.fullscreen = YES;
/* disabling the controls of the movie player */
self.moviePlayerController.controlStyle = MPMovieControlStyleNone;
/* Play the movie! */
[[self moviePlayerController] play];
}
-(void)createAndConfigurePlayerWithURL:(NSURL *)movieURL sourceType:(MPMovieSourceType)sourceType
{
[controlsView addSubview:downStreamView];
/* Create a new movie player object. */
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
if (player)
{
/* Save the movie object. */
[self setMoviePlayerController:player];
player.contentURL = MPMovieControlStyleNone;
//if(!player.fullscreen)
// player.fullscreen = YES;
/* Register the current object as an observer for the movie
notifications. */
// [self installMovieNotificationObservers];
/* Specify the URL that points to the movie file. */
[player setContentURL:movieURL];
/* If you specify the movie type before playing the movie it can result
in faster load times. */
[player setMovieSourceType:sourceType];
/* Apply the user movie preference settings to the movie player object. */
//[self applyUserSettingsToMoviePlayer];
/* Add a background view as a subview to hide our other view controls
underneath during movie playback. */
//CGRect viewInsetRect = CGRectInset ([self.view bounds],
// kMovieViewOffsetX,
//kMovieViewOffsetY );
/* Inset the movie frame in the parent view frame. */
[[player view] setFrame:downStreamView.bounds];
[player view].backgroundColor = [UIColor redColor];
/* To present a movie in your application, incorporate the view contained
in a movie player’s view property into your application’s view hierarchy.
Be sure to size the frame correctly. */
[downStreamView.layer addSublayer: [player view].layer];
}
}
-(void)installMovieNotificationObservers
{
MPMoviePlayerController *player = [self moviePlayerController];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(loadStateDidChange:)
name:MPMoviePlayerLoadStateDidChangeNotification
object:player];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePlayBackDidFinish:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:player];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(mediaIsPreparedToPlayDidChange:)
name:MPMediaPlaybackIsPreparedToPlayDidChangeNotification
object:player];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePlayBackStateDidChange:)
name:MPMoviePlayerPlaybackStateDidChangeNotification
object:player];
}
/* Notification called when the movie finished playing. */
- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
NSNumber *reason = [[notification userInfo] objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
switch ([reason integerValue])
{
/* The end of the movie was reached. */
case MPMovieFinishReasonPlaybackEnded:
/*
Add your code here to handle MPMovieFinishReasonPlaybackEnded.
*/
break;
/* An error was encountered during playback. */
case MPMovieFinishReasonPlaybackError:
NSLog(@"An error was encountered during playback");
[self performSelectorOnMainThread:@selector(displayError:) withObject:[[notification userInfo] objectForKey:@"error"] waitUntilDone:NO];
[self removeMovieViewFromViewHierarchy];
break;
/* The user stopped playback. */
case MPMovieFinishReasonUserExited:
[self removeMovieViewFromViewHierarchy];
break;
default:
break;
}
}
/* Remove the movie view from the view hierarchy. */
-(void)removeMovieViewFromViewHierarchy
{
MPMoviePlayerController *player = [self moviePlayerController];
[player.view removeFromSuperview];
}
- (void)animate {
isAnimationStarted = YES;
//First Animation
[UIView animateWithDuration:0.5 animations:^{
dot1.alpha = 1;
dot2.alpha = 0.5;
dot3.alpha = 0.5;
} completion:^(BOOL finished) {
//2nd Animation
[UIView animateWithDuration:0.5 animations:^{
dot1.alpha = 0.5;
dot2.alpha = 1;
dot3.alpha = 0.5;
} completion:^(BOOL finished) {
//3rd Animation
[UIView animateWithDuration:0.5 animations:^{
dot1.alpha = 0.5;
dot2.alpha = 0.5;
dot3.alpha = 1;
} completion:^(BOOL finished) {
[self performSelector:@selector(animate)];
}];
}];
}];
}
// Find a camera with the specificed AVCaptureDevicePosition, returning nil if one is not found
- (AVCaptureDevice *) cameraWithPosition:(AVCaptureDevicePosition) position
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *device in devices) {
if ([device position] == position) {
return device;
}
}
return nil;
}
// Find a front facing camera, returning nil if one is not found
- (AVCaptureDevice *) frontFacingCamera
{
return [self cameraWithPosition:AVCaptureDevicePositionFront];
}
// Find a back facing camera, returning nil if one is not found
- (AVCaptureDevice *) backFacingCamera
{
return [self cameraWithPosition:AVCaptureDevicePositionBack];
}
- (AVCaptureDevice *) audioDevice
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
if ([devices count] > 0) {
return [devices objectAtIndex:0];
}
return nil;
}
-(void)audioData:(id)info
{
NSArray *connections = audioOutput.connections;
AVCaptureConnection *connection = [connections objectAtIndex:0];
NSArray *audioChannels = connection.audioChannels;
AVCaptureAudioChannel *audioChannel = [audioChannels objectAtIndex:0];
//[label setText:[NSString stringWithFormat:@"%f", audioChannel.averagePowerLevel]];
}
伙计请帮我解决这个问题:(
问候