ios – Objective-C：如何控制DiracLE中多个音频播放器的音量

概述我正在Objective C中创建一个音乐应用程序.我需要同时播放多个声音,我可以使用DiracLE音频播放器来实现这一点. 但是这个库的音量控制方法 – (void)setVolume：(float)volume;似乎没有工作. 我的DiracAudioPlayer初始化代码： DiracAudioPlayer *player1,*player2;NSURL *url1,*url2;NSEr 我正在Objective C中创建一个音乐应用程序.我需要同时播放多个声音,我可以使用DiracLE音频播放器来实现这一点.

但是这个库的音量控制方法 – (voID)setVolume：(float)volume;似乎没有工作.

我的DiracAudioPlayer初始化代码：

DiracAudioPlayer *player1,*player2;NSURL *url1,*url2;NSError *error = nil;url1 = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"song1" ofType:@"mp3"]];url2 = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"song2" ofType:@"mp3"]];player1 = [[DiracAudioPlayer alloc] initWithContentsOfURL:mainURL channels:1 error:&error];[player1 setDelegate:self];player2 = [[DiracAudioPlayer alloc] initWithContentsOfURL:mainURL channels:1 error:&error];[player2 setDelegate:self];

设置播放器音量的方法：

-(voID)setPlayerVolume{   [player1 setVolume:0.5];   [player2 setVolume:0.2];}

setVolume：即使对于单个播放器也不起作用,也没有抛出异常.

如何解决这个问题？

解决方法 您还可以通过依次初始化2个AVAudioPlayers并使用[self.player setVolume：volumefloat]来控制音量来实现此目的.

...       Nsstring *songA = [[NSBundle mainBundle] pathForResource:@"songA" ofType:@"mp3"];    NSError *soundError = nil;    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:songA] error:&soundError];    if(self.player == nil)        NSLog(@"%@",soundError);    else    {        [self.player setDelegate:self];        [self.player setVolume:0.75];        [self.player play];    }    Nsstring *songB = [[NSBundle mainBundle] pathForResource:@"songB" ofType:@"mp3"];    soundError = nil;    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:songB] error:&soundError];    if(self.player == nil)        NSLog(@"%@",soundError);    else    {        [self.player setDelegate:self];        [self.player setVolume:0.25];        [self.player play];    }...

如果您决定使用DiracAudioPlayer,则可以使用自己的方法使用DiracAudioPlayerBase.mm中的正确卷参数重新初始化AudioUnit：

-(voID)setupInstanceWithUrl:(NSURL*)inUrl numChannels:(int)channels volume:(float)volume{    mDelegate = nil;    mInUrl = [inUrl copy];    mIsPrepared = NO;    mIsProcessing = NO;    mWorkerThread = nil;    mTotalFramesInfile = 0;    mIsRunning = NO;    mVolume = volume;    mLoopCount = mNumberOfLoops = 0;    mHasFinishedplaying = YES;    if (channels < 1) channels = 1;    else if (channels > 2) channels = 2;    mNumChannels = channels;    mPeak = new SInt16[mNumChannels];    mPeakOut = new SInt16[mNumChannels];    for (long v = 0; v < mNumChannels; v++) {        mPeakOut[v] = 0;        mPeak[v] = -1;    }    Osstatus status = noErr;    mTimeFactor = 1./kOversample;    mPitchFactor = kOversample;    // This is boilerplate code to set up CoreAudio on iOS in order to play audio via its default output    // Desired audio component    AudioComponentDescription desc;    desc.componentType = kAudioUnitType_Output;#if TARGET_OS_IPHONE    desc.componentSubType = kAudioUnitSubType_RemoteIO;#else    desc.componentSubType = kAudioUnitSubType_HALOutput;#endif    desc.componentManufacturer = kAudioUnitManufacturer_Apple;    desc.componentFlags = 0;    desc.componentFlagsMask = 0;    // Get ref to component    AudioComponent defaultOutput = AudioComponentFindNext(NulL,&desc);    // Get matching audio unit    status = AudioComponentInstanceNew(defaultOutput,&mAudioUnit);    checkStatus(status);    // this is the format we want    AudioStreamBasicDescription audioFormat;    mSampleRate=audioFormat.mSampleRate         = 44100.00;    audioFormat.mFormatID           = kAudioFormatlinearPCM;    audioFormat.mFormatFlags        = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;    audioFormat.mFramesPerPacket    = 1;    audioFormat.mChannelsPerFrame   = mNumChannels;    audioFormat.mBitsPerChannel     = 16;    audioFormat.mBytesPerPacket     = sizeof(short)*mNumChannels;    audioFormat.mBytesPerFrame      = sizeof(short)*mNumChannels;    status = AudioUnitSetProperty(mAudioUnit,kAudioUnitProperty_StreamFormat,kAudioUnitScope_input,kOutputBus,&audioFormat,sizeof(audioFormat));    checkStatus(status);    // here we set up CoreAudio in order to call our PlaybackCallback    AURenderCallbackStruct callbackStruct;    callbackStruct.inputProc = PlaybackCallback;    callbackStruct.inputProcRefCon = (__brIDge voID*) self;    status = AudioUnitSetProperty(mAudioUnit,kAudioUnitProperty_SetRenderCallback,&callbackStruct,sizeof(callbackStruct));    checkStatus(status);    // Initialize unit    status = AudioUnitinitialize(mAudioUnit);    checkStatus(status);    // here we allocate our audio cache    mAudioBuffer = AllocateAudioBufferSInt16(mNumChannels,kAudioBufferNumFrames);    // AvoID delay when hitting play by making sure the graph is pre-initialized    AudioOutputUnitStart(mAudioUnit);    AudioOutputUnitStop(mAudioUnit);    [self preparetoPlay];}

仔细检查您的卷是否通过记录设置：

NSLog(@"Volume P1: %f",[player1 volume]);NSLog(@"Volume P2: %f",[player2 volume]);

此外,您还可以通过硬件音量按钮使用的相同方法来控制混音的输出音量：(这将启动iOS音量更改的UI)

-(voID)addVolumeObserver {    MPVolumeVIEw *volumeVIEw = [MPVolumeVIEw new];    volumeVIEw.showsRoutebutton = NO;    volumeVIEw.showsVolumeSlIDer = NO;    AppDelegate *appDelegate = (AppDelegate *) [[UIApplication sharedApplication] delegate];    [appDelegate.window.rootVIEwController.vIEw addSubvIEw:volumeVIEw];    __weak __typeof(self)weakSelf = self;    [[volumeVIEw subvIEws] enumerateObjectsUsingBlock:^(ID obj,NSUInteger IDx,BOol *stop) {        if ([obj isKindOfClass:[UiSlider class]]) {            __strong __typeof(weakSelf)strongSelf = weakSelf;            strongSelf->volumeSlIDer = obj;            [obj addTarget:strongSelf action:@selector(handleVolumeChanged:) forControlEvents:UIControlEventValueChanged];            *stop = YES;        }    }];}- (voID)handleVolumeChanged:(ID)sender{    NSLog(@"Volume: %f",volumeSlIDer.value);}- (voID)setVolumeHandlerTo:(float)volume{    volumeSlIDer.value = volume;}

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