Question

我正在使用目标C制作一个8步鼓音序器。我正在将缓冲，小鼓和帽子样本加载到缓冲区中，但是当模拟器运行并按下开关来切换底鼓时，我得到一个可怕的EXC_BAD_ACCESS错误，程序退出。

在输入断点后，调试窗口显示缓冲区中没有任何内容。但据我所知，它们已装在这里：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // laod the audio files into memory buffers
    _kickBuffer  = [PAEBuffer bufferNamed:@"TMD 09 KICK.aif"];
    _snareBuffer = [PAEBuffer bufferNamed:@"TMD 09 SN 1.aif"];
    _hihatBuffer = [PAEBuffer bufferNamed:@"TMD 09 CHH.aif"];

    // initialise the host
    _host = [PAEAudioHost audioHostWithNumOutputs:2];

    // create some channel strips to play the audio

    const int numVoices = 16;
    NSMutableArray* channelStrips = [[NSMutableArray alloc] initWithCapacity:numVoices];

    for (int i = 0; i < numVoices; ++i)
    {
        PAEChannelStrip* channelStrip = [PAEChannelStrip channelStripWithNumChannels:2];
        [channelStrips addObject:channelStrip];
    }

此功能中出现错误

-(void)playBuffer:(PAEBuffer*)buffer
{
    PAEBufferPlayer* player = [PAEBufferPlayer bufferPlayerWithBuffer:buffer];
    player.loop = NO;
    PAEChannelStrip* channelStrip = _channelStrips[_nextVoice];
    channelStrip.input = player;

    // we allocated voices in a round robin fashion, reallocating the oldest voices first
    _nextVoice++;

    if (_nextVoice >= _channelStrips.count)
        _nextVoice = 0;
}

我是这个语言的新手，很抱歉如果我没有把一切都弄清楚的话。任何帮助都很受欢迎，谢谢。

（编辑）添加了setStep函数

// the step has changed
-(void)setStep:(int)step
{
    if (step < 0 || step >= NUMSTEPS)
        return;

    _step = step;

    // decide which buffers to play on this step

    if (_kickSteps[step])
        [self playBuffer:_kickBuffer];

    if (_snareSteps[step])
        [self playBuffer:_snareBuffer];

    if (_hihatSteps[step])
        [self playBuffer:_hihatBuffer];
}

Answer 1

音频样本位于项目的build文件夹中，但不在Xcode的“支持文件夹”中。问题解决了。

iOS鼓音序器 - 缓冲区问题（访问不良）

1 个答案: