AVPlayer和本地文件
AVPlayer和本地文件
提问于 2012-03-06 11:20:12
我正在为iOS构建一个播放web上托管的音频文件的MP3播放器。我想提供离线播放文件的能力，所以我有文件下载使用ASIHTTP，但我似乎找不到在应用程序文档目录中的mp3初始化AVPlayer的信息。以前有人这么做过吗？这有可能吗？
*我在下面发布了一个答案，展示了如何对本地和http文件使用iOS AvPlayer。希望这能有所帮助！
回答 6
Stack Overflow用户
回答已采纳
发布于 2012-03-08 20:42:17
我决定回答我自己的问题，因为我觉得关于如何使用苹果提供的用于本地和流(通过http)文件的AVPlayer的文档很少。为了帮助理解该解决方案，我将一个sample project on GitHub in Objective-C和Swift放在一起。下面的代码是Objective-C，但您可以下载我的Swift示例来查看。它非常相似！
我发现，除了为Asset > PlayerItem > AVPlayer链实例化NSURL之外，这两种设置文件的方法几乎是相同的。
下面是核心方法的概述
.h文件(部分代码)
-(IBAction) BtnGoClick:(id)sender;
-(IBAction) BtnGoLocalClick:(id)sender;
-(IBAction) BtnPlay:(id)sender;
-(IBAction) BtnPause:(id)sender;
-(void) setupAVPlayerForURL: (NSURL*) url;.m文件(部分代码)
-(IBAction) BtnGoClick:(id)sender {
NSURL *url = [[NSURL alloc] initWithString:@""];
[self setupAVPlayerForURL:url];
}
-(IBAction) BtnGoLocalClick:(id)sender {
// - - - Pull media from documents folder
//NSString* saveFileName = @"MyAudio.mp3";
//NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//NSString *documentsDirectory = [paths objectAtIndex:0];
//NSString *path = [documentsDirectory stringByAppendingPathComponent:saveFileName];
// - - -
// - - - Pull media from resources folder
NSString *path = [[NSBundle mainBundle] pathForResource:@"MyAudio" ofType:@"mp3"];
// - - -
NSURL *url = [[NSURL alloc] initFileURLWithPath: path];
[self setupAVPlayerForURL:url];
}
-(void) setupAVPlayerForURL: (NSURL*) url {
AVAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil];
AVPlayerItem *anItem = [AVPlayerItem playerItemWithAsset:asset];
player = [AVPlayer playerWithPlayerItem:anItem];
[player addObserver:self forKeyPath:@"status" options:0 context:nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (object == player && [keyPath isEqualToString:@"status"]) {
if (player.status == AVPlayerStatusFailed) {
NSLog(@"AVPlayer Failed");
} else if (player.status == AVPlayerStatusReadyToPlay) {
NSLog(@"AVPlayer Ready to Play");
} else if (player.status == AVPlayerItemStatusUnknown) {
NSLog(@"AVPlayer Unknown");
}
}
}
-(IBAction) BtnPlay:(id)sender {
[player play];
}
-(IBAction) BtnPause:(id)sender {
[player pause];
}请查看Objective-C source code，了解有关这方面的工作示例。希望这能有所帮助！
Stack Overflow用户
发布于 2016-05-20 00:02:04
我通过将file://前缀到我的本地URL来让AVPlayer与本地url一起工作
NSURL * localURL = [NSURL URLWithString:[@"file://" stringByAppendingString:YOUR_LOCAL_URL]];
AVPlayer * player = [[AVPlayer alloc] initWithURL:localURL];Stack Overflow用户
发布于 2012-03-06 12:34:48
是的，可以下载.mp3(或任何类型的文件)并保存到NSDocument目录中，然后您可以使用AVAudioPlayer从该目录中检索并播放。
NSString *downloadURL=**your url to download .mp3 file**
NSURL *url = [NSURLURLWithString:downloadURL];
NSURLConnectionalloc *downloadFileConnection = [[[NSURLConnectionalloc] initWithRequest: [NSURLRequestrequestWithURL:url] delegate:self] autorelease];//initialize NSURLConnection
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *fileDocPath = [NSStringstringWithFormat:@"%@/",docDir];//document directory path
[fileDocPathretain];
NSFileManager *filemanager=[ NSFileManager defaultManager ];
NSError *error;
if([filemanager fileExistsAtPath:fileDocPath])
{
//just check existence of files in document directory
}
NSURLConnection is used to download the content.NSURLConnection Delegate methods are used to support downloading.
(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSFileManager *filemanager=[NSFileManagerdefaultManager];
if(![filemanager fileExistsAtPath:filePath])
{
[[NSFileManagerdefaultManager] createFileAtPath:fileDocPath contents:nil attributes:nil];
}
NSFileHandle *handle = [NSFileHandlefileHandleForWritingAtPath:filePath];
[handle seekToEndOfFile];
[handle writeData:data];
[handle closeFile];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *alertView=[[UIAlertViewalloc]initWithTitle:@”"message:
[NSStringstringWithFormat:@"Connection failed!\n Error - %@ ", [error localizedDescription]] delegate:nilcancelButtonTitle:@”Ok”otherButtonTitles:nil];
[alertView show];
[alertView release];
[downloadFileConnectioncancel];//cancel downloding
}找回下载的音频并播放：
NSString *docDir1 = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *myfilepath = [docDir1 stringByAppendingPathComponent:YourAudioNameinNSDOCDir];
NSLog(@”url:%@”,myfilepath);
NSURL *AudioURL = [[[NSURLalloc]initFileURLWithPath:myfilepath]autorelease];只需编写代码即可使用AudioURL播放音频
我想知道你在这方面是否有任何澄清。
谢谢
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原文链接：
https://stackoverflow.com/questions/9577471
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