AVPlayer And Local Files

Question

I am building a MP3 player for iOS that plays audio files hosted on the web. I want to offer the ability to play the files offline so I have the files downloading using ASIH

Answer 1

Yes,thats possible to download and save the .mp3(or any kind of file)into NSDocument directory and then you can retrive from that and play by using AVAudioPlayer.

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
  }

Retrieve the downloaded Audio and Play:

   NSString *docDir1 = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,   NSUserDomainMask, YES) objectAtIndex:0];

   NSString *myfilepath = [docDir1 stringByAppendingPathComponent:YourAudioNameinNSDOCDir];

   NSLog(@”url:%@”,myfilepath);

   NSURL *AudioURL = [[[NSURLalloc]initFileURLWithPath:myfilepath]autorelease];

Just write your code to play Audio by using AudioURL

I Like to know if u have any clarification in this regard.

Thank you