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12.5 Recording, playing, and accessing video
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One of the major updates included with the iPhone 3GS was a built-in video camera. This allows users to easily record video and save it to their media library. The code for recording video is almost identical to the code to show the camera in chapter 11, but it does have a few required checks. Listing 12.6 shows the code for bringing up the video camera interface.
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Recording, playing, and accessing video
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Listing 12.6
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Displaying the video camera
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Is camera -(void) showVideoCamera { available if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { myImagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; } else { NSLog(@"Camera not supported"); return; } NSArray *media = [UIImagePickerController availableMediaTypesForSourceType: UIImagePickerControllerSourceTypeCamera];
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supported if([media containsObject:kUTTypeMovie]) { media types myImagePicker.mediaTypes = [NSArray arrayWithObjects: kUTTypeMovie,nil]; [self presentModalViewController:myImagePicker animated:YES];
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} else { NSLog(@ Video not supported ); } }
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Shows video camera
The first thing you do is check to see if the device has camera support B. In two cases, this returns false. The first is when the user has an iPod Touch: as of this writing, the iPod Touch doesn t support taking photos. The other case is if the camera is damaged on the iPhone. Next, you check to see what media types the camera supports C. In this case, you look for the media type kUTTypeMovie. If this is found, the camera supports video. You set the media type of the picker to kUTTypeMovie to tell it to display the video camera. By default, it s set to kUTTypeImage, which specifies photos, so it s necessary that you set it. Make sure the Mobile Core Services framework has been added to your project in order to reference the kUTTypeMovie media type. Finally, you display the video camera on the screen D. One great feature that Apple added is the ability to edit the video on the fly. This is easy to integrate in the code. Add this line prior to displaying the video camera:
myImagePicker.allowsEditing = YES;
This great one-liner from Apple adds a ton of functionality. After the user finishes recording the video, the delegate method didFinishPickingMediaWithInfo: for the picker is called. The dictionary passed to this method contains a system path URL to the video file that was just recorded. The following code shows how to use this path to retrieve and play back the video:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSURL * pathURL = [info objectForKey: UIImagePickerControllerMediaURL]; MPMoviePlayerController * player = [[MPMoviePlayerController alloc] initWithContentURL:pathURL]; [player play]; }
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Media: audio and recording
The first thing this method does is retrieve the path URL from the info dictionary. The path URL is the object stored with the key UIImagePickerControllerMediaURL. Next, an MPMoviePlayerController is allocated with the contents of the path URL. This loads the video and prepares it to play. The last thing to do is call the play method, and the video begins.
12.6 Summary
Even novice programmers can now achieve audio recording and playback. With the release of the AV Foundation frameworks, writing fully featured audio applications is a breeze. The MPMediaPickerController provides a method for accessing the user s iPod media library. Using this in conjunction with the MPMusicPlayerController gives you the ability to create applications in which the user has complete control over the audio being played. In addition to discussing how to play music from the user s iPod library, we covered how to play audio from within your own application. This can be anything from simple sounds to recordings made with the AVAudioRecorder. The AVAudioPlayer makes audio playback a simple and painless task. Although we ve only begun to scratch the surface of audio management, you now have the tools necessary to integrate audio into any application. If you want to learn more about the AV Foundation framework, read the document on Apple s developer website titled Getting Started with Audio & Video.
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