我正在尝试为AVAudioPlayer同时播放几个声音文件。我读了一篇解释如何做到这一点的帖子@ AVAudioPlayer Help: Playing multiple sounds simultaneously, stopping them all at once, and working around Automatic Reference Counting。这似乎是一个奇怪的问题,因为当我尝试一次只播放一个文件时(当self.options.on为ON时),它可以工作,但是当我尝试创建多个实例(else语句)并且不播放它们时播放。我检查了输出文件的URL是否正确,是的,那么它无法正常工作的原因是什么?
谢谢!
- (void)playTapped:(id)sender
{
if (!recorder.recording)
{
if(self.options.on)
{
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
NSArray *pathComponents = [NSArray arrayWithObjects:
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
[NSString stringWithFormat:@"sound%i.m4a",last],
nil];
NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:outputFileURL error:nil];
NSLog(@"%@",player.url);
[player setDelegate:self];
[player play];
}
else
{
// trying to play all sounds at once
for (NSString *str in self.soundsCreated){
NSLog(@"%@",str);
NSArray *pathComponents = [NSArray arrayWithObjects:
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
[NSString stringWithFormat:@"sound%@.m4a",str],
nil];
NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:outputFileURL error:nil];
NSLog(@"%@",audioPlayer.url);
[audioPlayer prepareToPlay];
[audioPlayer setDelegate:self];
[audioPlayer play];
}
}
}
}
注
我尝试使用NSError
检查初始化,但我没有收到任何错误:
NSError *sessionError = nil;
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:outputFileURL error:&sessionError];
if (sessionError)
{
NSLog(@"Error in audioPlayer: %@",[sessionError localizedDescription]);
}
解
这似乎是我的NSMutableArray
的初始化问题。
我改变了它们:
self.soundsCreated = [[NSMutableArray alloc]init];
self.playerArray = [[NSMutableArray alloc]init];
到
self.soundsCreated = [NSMutableArray new];
self.playerArray = [NSMutableArray new];
并修复了它
答案 0 :(得分:0)
我在播放小文件时遇到了同样的问题:
这是我的解决方案(示例)
- (void)dropSoundWhileRefresh
{
NSError *sessionError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient error:&sessionError];
[[AVAudioSession sharedInstance] setActive:YES error:&sessionError];
[[AVAudioSession sharedInstance] setDelegate:self];
NSURL *musicFile = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"waterDrops" ofType:@"mp3"]];
dropSound = [[AVAudioPlayer alloc] initWithContentsOfURL:musicFile error:nil];
[dropSound setDelegate:self];
[dropSound setVolume:0.10];
[dropSound setNumberOfLoops:0];
[dropSound play];
}
答案 1 :(得分:0)
而不是将错误传递为nil尝试此操作并检查初始化是否正常工作。
AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
if (error)
{
DebugLog(@"Error in audioPlayer: %@",[error localizedDescription]);
}