IOS AVAudioPlayer的最大音量级别？

Question

我使用AVAudioPlayer播放.caf文件.我的问题是:它不够响亮我的目的.由于iPhone的振铃声响亮得多,我想知道如何归档这个音量.我已经尝试过操作.caf文件,但没有取得真正的成功.有任何想法吗？

我到目前为止使用的代码:

    AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: url error: nil];
self.appSoundPlayer = newPlayer;
[newPlayer release];
[appSoundPlayer prepareToPlay];
[appSoundPlayer setVolume: 0.8];
[appSoundPlayer setDelegate: self];
    [appSoundPlayer play];

编辑:

[appSoundPlayer setVolume: 1.0];

Thx Martin

Answer 1

您始终可以将音量设置为实际最大值,例如:

[appSoundPlayer setVolume: 1.0];

除此之外,您可能需要编辑文件本身.

Answer 2

马丁,您确保系统容量达到最大值吗？如果没有,您希望使用MPMusicPlayerController将系统音量调高到最大值,而不仅仅是avaudioplayer最大值.您可以将其调高为声音片段的长度,然后将其设置回用户设置的原始音量.

// Import headers. Link to "MediaPlayer Framework"
#import <MediaPlayer/MediaPlayer.h>

//set up audio session
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:NULL];

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);

NSURL *soundUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"HsTR_soundEFX_2-1" ofType:@"mp3"]];
audioAlert= [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];
audioAlert.delegate = self;
[audioAlert prepareToPlay];//audioAlert is an AVAudioPLayer declared in header

//and whereever you want to play the sound, call the lines below
float currentVolume=[MPMusicPlayerController applicationMusicPlayer].volume; //grab current User volume
[[MPMusicPlayerController applicationMusicPlayer] setVolume:1.0];//set system vol to max
[audioAlert play];
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(setVolumeBackToNormal)userInfo:nil repeats:NO];

//and the setVolumeBackToNormal function calls this line below
[[MPMusicPlayerController applicationMusicPlayer]setVolume:currentVolume];//returns volume to original setting