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POMultiple synchronized MediaPlayers
 

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    <p>I am developing a musical application that plays several sounds all together, like a sort of multitrack program. A timer triggers when it's the moment for all the sounds to play. Sounds have to be played exactly on the beat and perfectly synchronized and mixed.</p> <p>The easiest solution i found is to have one MediaPlayer for each sound, initialize all of them at the very beginning, with MediaPlayer.create() inside my app's OnCreate(). To make it more reliable and quick I made TWO mediaplayers for each sound. Then I have a timer that calls simple loop, similar to this:</p> <pre><code>for (int w=0; w&lt;SOUNDS; w++) if (must_play(w)) { if (mp[w].isPlaying()) { if (mp2[w].isPlaying()) mp[w].seekTo(0); else mp2[w].start(); } else mp[w].start(); } </code></pre> <p>I used .seekTo(0) because I found it slightly faster than making .stop() and .start(). But the sounds are not always perfectly synchronized. A 1/10 of second of delay between the .start() of two mediaplayers is very annoying if those two sounds are two drums that are supposed to play perfectly in line. Is there a way to force all mediaplayers that are instructed to .start() to effectly play all at once? Please note that the sounds may be very short, like drum sounds: the problem is not to keep the multiple media players synchronized over time, but to make them start exactly all together, without delay.</p> <p>The question is rather tricky because in my opinion involves two problems:</p> <ul> <li>Prioritization, above other processes that may slow down the timer or the app itself.</li> <li>How to create a single command/object/method (or whatever) that runs all the sounds atomically.</li> </ul> <p>Thank you.</p>
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    1. COI do not think that multiple instances of a mediaplayer will stay synchronized over time, as they all use their own internal timing mechanisms. For these kind of applications you need a (custom) mediaplayer that is able to play multiple tracks using the same timing mechanism...
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    2. COPlease note that I'm talking about very short audio files, like drum sounds, the problem is not the synchronization over time, but make them start exactly at the same time. I add this clarification in the main post.
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