iOS開源項目：AudioPlayer

 

AudioPlayer是一個基於AVAudioStreamer的在線音樂播放軟件。

https://github.com/marshluca/AudioPlayer

 

首先將歌曲信息存儲在NSArray中：

    itemArray = [[NSArray arrayWithObjects:
                  [NSDictionary dictionaryWithObjectsAndKeys:@"溫柔", @"song", @"五月天", @"artise", @"http://y1.eoews.com/assets/ringtones/2012/5/18/34049/oiuxsvnbtxks7a0tg6xpdo66exdhi8h0bplp7twp.mp3", @"url", nil],
                  [NSDictionary dictionaryWithObjectsAndKeys:@"今天", @"song", @"劉德華", @"artise", @"http://y1.eoews.com/assets/ringtones/2012/5/18/34045/hi4dwfmrxm2citwjcc5841z3tiqaeeoczhbtfoex.mp3", @"url", nil],
                  [NSDictionary dictionaryWithObjectsAndKeys:@"K歌之王", @"song", @"陳奕迅", @"artise", @"http://y1.eoews.com/assets/ringtones/2012/5/17/34031/axiddhql6nhaegcofs4hgsjrllrcbrf175oyjuv0.mp3", @"url", nil],
                  [NSDictionary dictionaryWithObjectsAndKeys:@"知足", @"song", @"五月天", @"artise", @"http://y1.eoews.com/assets/ringtones/2012/5/17/34016/eeemlurxuizy6nltxf2u1yris3kpvdokwhddmeb0.mp3", @"url", nil],
                  [NSDictionary dictionaryWithObjectsAndKeys:@"桔子香水", @"song", @"任賢齊", @"artise", @"http://y1.eoews.com/assets/ringtones/2012/6/29/36195/mx8an3zgp2k4s5aywkr7wkqtqj0dh1vxcvii287a.mp3", @"url", nil],
                  
                 nil] retain];

然后在播放的時候：

- (void)playAudio:(AudioButton *)button
{    
    NSInteger index = button.tag;
    NSDictionary *item = [itemArray objectAtIndex:index];
    
    if (_audioPlayer == nil) {
        _audioPlayer = [[AudioPlayer alloc] init];
    }
        
    if ([_audioPlayer.button isEqual:button]) {
        [_audioPlayer play];
    } else {
        [_audioPlayer stop];
        
        _audioPlayer.button = button; 
        _audioPlayer.url = [NSURL URLWithString:[item objectForKey:@"url"]];

        [_audioPlayer play];
    }   
}

在[_audioPlayer play]內部，使歌曲的url初始化AudioStreamer，並用NSTimer設置一個每0.1秒調用一次的方法來更新歌曲的播放進度。然后注冊一個播放狀態變化的通知。

- (void)play
{        
    if (!streamer) {
        
        self.streamer = [[AudioStreamer alloc] initWithURL:self.url];
        
        // set up display updater
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:
                                    [self methodSignatureForSelector:@selector(updateProgress)]];    
        [invocation setSelector:@selector(updateProgress)];
        [invocation setTarget:self];
        
        timer = [NSTimer scheduledTimerWithTimeInterval:0.1
                                             invocation:invocation 
                                                repeats:YES];
        
        // register the streamer on notification
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(playbackStateChanged:)
                                                     name:ASStatusChangedNotification
                                                   object:streamer];
    }
    
    if ([streamer isPlaying]) {
        [streamer pause];
    } else {
        [streamer start];
    }
}