ios 播放视频

.h

#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>

@interface ViewController : UIViewController
@property (nonatomic,strong) MPMoviePlayerController *player;
- (IBAction)SelfVideo;
- (IBAction)RecordVideo;
- (IBAction)PlayVideo;

@end

.m

//
//  ViewController.m
//  SysAssetVideourlToTempFile
//
//  Created by jstv.com jstv on 12-6-19.
//  Copyright (c) 2012年 jstv.com. All rights reserved.
//

#import "ViewController.h"
#import <AssetsLibrary/AssetsLibrary.h>
@interface ViewController ()

@end

@implementation ViewController
@synthesize player;
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

+(NSString*) videoAssetURLToTempFile:(NSURL*)url
{
    
    NSString * surl = [url absoluteString];
    NSString * ext = [surl substringFromIndex:[surl rangeOfString:@"ext="].location + 4];
    NSTimeInterval ti = [[NSDate date]timeIntervalSinceReferenceDate];
    NSString * filename = [NSString stringWithFormat: @"%f.%@",ti,ext];
    NSString * tmpfile = [NSTemporaryDirectory() stringByAppendingPathComponent:filename];
    
    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
    {
        
        ALAssetRepresentation * rep = [myasset defaultRepresentation];
        
        NSUInteger size = [rep size];
        const int bufferSize = 8192;
        
        NSLog(@"Writing to %@",tmpfile);
        FILE* f = fopen([tmpfile cStringUsingEncoding:1], "wb+");
        if (f == NULL) {
            NSLog(@"Can not create tmp file.");
            return;
        }
        
        Byte * buffer = (Byte*)malloc(bufferSize);
        int read = 0, offset = 0, written = 0;
        NSError* err;
        if (size != 0) {
            do {
                read = [rep getBytes:buffer
                          fromOffset:offset
                              length:bufferSize 
                               error:&err];
                written = fwrite(buffer, sizeof(char), read, f);
                offset += read;
            } while (read != 0);
            
            
        }
        fclose(f);
        
        
    };
    
    
    ALAssetsLibraryAccessFailureBlock failureblock  = ^(NSError *myerror)
    {
        NSLog(@"Can not get asset - %@",[myerror localizedDescription]);
        
    };
    
    if(url)
    {
        ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
        [assetslibrary assetForURL:url 
                       resultBlock:resultblock
                      failureBlock:failureblock];
    }
    
    return tmpfile;
}
- (IBAction)SelfVideo {  //获取系统视频
    
  }

- (IBAction)RecordVideo {  //调用录制视频接口录制视频并保存
    
}
-(void)finishedPlaying:(NSNotification *)paramNotification
{
    NSNumber *reason = [paramNotification.userInfo valueForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
    if(reason !=nil)
    {
        NSInteger reasonAsInteger = [reason integerValue];
        switch (reasonAsInteger) {
            case MPMovieFinishReasonPlaybackEnded:
            {
                NSLog(@"正常播放完成");
                break;
            }
                case MPMovieFinishReasonPlaybackError:
            {
                NSLog(@"错误引起播放结束");
                break;
            }
            case MPMovieFinishReasonUserExited:
            {
                NSLog(@"用户退出");
            }
                
            default:
                break;
        }
        NSLog(@"finished reason=%ld",(long)reasonAsInteger);
        
    }
}

- (IBAction)PlayVideo {   //播放视频
    NSLog(@"播放");
    NSURL *url = [NSURL URLWithString:@"http://202.102.79.115/webmedia//2012/05/29/mingshigt/mingshigt_20120529_937346_3.mp4"];
    self.player = [[MPMoviePlayerController alloc] initWithContentURL:url];
    if(self.player !=nil)
    {
        [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(finishedPlaying) name:MPMoviePlayerPlaybackDidFinishNotification object:self.player];
        self.player.scalingMode = MPMovieScalingModeAspectFit;
        [self.player play];
        [self.view addSubview:self.player.view];
        [self.player setFullscreen:YES animated:YES];
    }
    
    
}

@end