How to deal with sound effects?

[ghost]

How can I play a sound effects when the last playback was not finished？ For example, the percussion effect of a rhythm game, an audio can be play many times at the same time.

[dturner]

This is up to you. There are 2 options:

1) Have many instances of a percussion sound (with a set maximum of say 10 concurrent sounds) and trigger each one independently. You would need to play each sound through a mixer.

2) Have a single instance of the percussion sound and restart it each time the user taps the drum.

It really depends on what kind of effect you want to achieve. Option 2 is more common for a single drum since this is actually what happens in the real world. You can bang a drum many times but you still only have one drum.

[ghost]

Thanks for your prompt reply. What I need is the Option 1. Does the same audio's wave data occupy the same memory in multiple instances?

[dturner]

So for option 1 you would need multiple sound objects, each with its own separate memory.

You could use the SoundRecording and Mixer objects from here: https://github.com/google/oboe/tree/master/samples/RhythmGame/src/main/cpp/audio

Each SoundRecording could be initialized using the same sound asset which copies the contents into memory using SoundRecording::loadFromAsset. Each SoundRecording could be added to the Mixer using addTrack.

On each audio callback you would call Mixer::renderAudio. On each tap you would need to switch on the next sound which isn't currently playing by calling SoundRecording::setPlaying(true). The easiest way to do this is probably to just loop through the array of sounds and play the first one where isPlaying returns false (method is trivial to implement).

[ghost]

Thanks a lot.