iPhone：获取音频文件的持续时间 [英] iPhone: get duration of an audio file

问题描述

获得音频文件持续时间的最简单方法是什么？

What is the easiest way to get a duration of an audio file?

我可以创建一个AVAudioPlayer对象，用URL初始化，但这种方式太长了。有更简单的方法吗？

I could create an object of AVAudioPlayer, initialize it with URL and than get the duration, but this way is too long. Is there an easier way?

谢谢。

推荐答案

请使用音频文件服务功能。有一个属性，应该给你的估计持续时间。代码：

You can use the Audio File Services functions. There's one property to get that should give you the estimated duration. Code:

    NSURL *afUrl = [NSURL fileURLWithPath:soundPath];
    AudioFileID fileID;
    OSStatus result = AudioFileOpenURL((CFURLRef)afUrl, kAudioFileReadPermission, 0, &fileID);
    UInt64 outDataSize = 0;
    UInt32 thePropSize = sizeof(UInt64);
    result = AudioFileGetProperty(fileID, kAudioFilePropertyEstimatedDuration, &thePropSize, &outDataSize);
    AudioFileClose(fileID);

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