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POWhat is the best way to get an audio file duration in Android?
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  1. POWhat is the best way to get an audio file duration in Android?
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    copied!<p>I'm using a <a href="http://developer.android.com/intl/zh-CN/reference/android/media/SoundPool.html" rel="nofollow noreferrer">SoundPool</a> to play audio clips in my app. All is fine but I need to know when the clip playback has finished.</p> <p>At the moment I track it in my app by obtaining the duration of each clip using a <a href="http://developer.android.com/intl/zh-CN/reference/android/media/MediaPlayer.html" rel="nofollow noreferrer">MediaPlayer</a> instance. That works fine but it looks wasteful to load each file twice, just to get the duration. I could roughly calculate the duration myself knowing the length of the file (available from the <a href="http://developer.android.com/intl/zh-CN/reference/android/content/res/AssetFileDescriptor.html" rel="nofollow noreferrer">AssetFileDescriptor</a>) but I'd still need to know the sample rate and the number of channels.</p> <p>I see two potential solutions to that problem:</p> <ol> <li>Figuring out when a clip has finished playing (doesn't seem to be possible with SoundClip).</li> <li>Having a class which could load just the header of an audio file and give me the sample rate/number of channels (and, ideally, the sample count to get the exact duration).</li> </ol> <p>Any suggestions?</p> <p>Thanks, Max</p> <p>The code I'm using at the moment (works fine but is rather heavy for the purpose):</p> <pre><code>String[] fileNames = ... MediaPlayer mp = new MediaPlayer(); for (String fileName : fileNames) { AssetFileDescriptor d = context.getAssets().openFd(fileName); mp.reset(); mp.setDataSource(d.getFileDescriptor(), d.getStartOffset(), d.getLength()); mp.prepare(); int duration = mp.getDuration(); // ... } </code></pre> <p>On a side note, this question has already been <a href="https://stackoverflow.com/questions/3357484/is-there-a-way-to-determine-the-duration-of-an-audio-file">asked</a> but got no answers.</p>
 

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