Objective c AVAudioPlayer如何播放快速或慢速文件

我只需要缓慢或快速地听这个文件。任何帮助都将不胜感激

AVAudioplayer无法做到这一点，AVPlayer可以做到

       // play audio file as NSURL *url;
    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO]
                                                        forKey:AVURLAssetPreferPreciseDurationAndTimingKey];

    AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:options];
    NSString *tracksKey = @"tracks";
    [urlAsset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:
     ^{

         // Completion handler block.
         dispatch_async(dispatch_get_main_queue(),
                        ^{
                            NSError *error = nil;
                            AVKeyValueStatus status = [urlAsset statusOfValueForKey:tracksKey error:&error];

                            if (status == AVKeyValueStatusLoaded) {
                                self.avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
                                [avPlayer play];

                                avPlayer.rate = 0.5;
                            }
                            else {
                                // You should deal with the error appropriately.
                                NSLog(@"The asset's tracks were not loaded:\n%@", [error localizedDescription]);

                            }

                        });
     }];

---

AVAudioplayer不能这么做，AVPlayer可以

       // play audio file as NSURL *url;
    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO]
                                                        forKey:AVURLAssetPreferPreciseDurationAndTimingKey];

    AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:options];
    NSString *tracksKey = @"tracks";
    [urlAsset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:
     ^{

         // Completion handler block.
         dispatch_async(dispatch_get_main_queue(),
                        ^{
                            NSError *error = nil;
                            AVKeyValueStatus status = [urlAsset statusOfValueForKey:tracksKey error:&error];

                            if (status == AVKeyValueStatusLoaded) {
                                self.avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
                                [avPlayer play];

                                avPlayer.rate = 0.5;
                            }
                            else {
                                // You should deal with the error appropriately.
                                NSLog(@"The asset's tracks were not loaded:\n%@", [error localizedDescription]);

                            }

                        });
     }];

---

谢谢，但我已经解决了它如下：

安装cocos2d

[[SimpleAudioEngine sharedEngine]播放效果：（NSString*）俯仰（浮动32）平移（浮动32）增益（浮动32）]

---

它很简单，也很有效

谢谢，但我已经解决了以下问题：

安装cocos2d

[[SimpleAudioEngine sharedEngine]播放效果：（NSString*）俯仰（浮动32）平移（浮动32）增益（浮动32）]

---

它很简单，也很有效

在Swift 3.0中，它将是这样的-

    audioP = try! AVAudioPlayer(contentsOf: URL(fileURLWithPath: selectedPath), fileTypeHint: "caf")
    audioP.enableRate = true
    audioP.prepareToPlay()
    audioP.rate = 1.5
    audioP.play()

---

希望这有帮助：）

在Swift 3.0中，它将是这样的-

    audioP = try! AVAudioPlayer(contentsOf: URL(fileURLWithPath: selectedPath), fileTypeHint: "caf")
    audioP.enableRate = true
    audioP.prepareToPlay()
    audioP.rate = 1.5
    audioP.play()

---

希望这有帮助：）

AVPlayer

不能这样做。调整速度时是否希望音频音高保持不变？请检查此

AVPlayer

无法执行此操作。你想在调整速度时音频音高保持不变吗？检查此选项，这会给你带来糟糕的音质。这将给你可怕的音质。