audio - How to generate complex sound on Android? -


i need generate complex sound few frequences (superposition) on android in real-time. how can using android sdk (preferred) or ndk?

it seems using tonegenerator not flexible enough. recording audiotrack generated sound data , playing seems right direction, need in real-time , recording , playing seems not real-time.

an example book "pro android media" shawn van every:

import android.app.activity; import android.media.audioformat; import android.media.audiomanager; import android.media.audiotrack; import android.os.asynctask; import android.os.bundle; import android.util.log; import android.view.view; import android.view.view.onclicklistener; import android.widget.button;  public class audiosynthesis extends activity implements onclicklistener {     button startsound;     button endsound;  audiosynthesistask audiosynth; boolean keepgoing = false; float synth_frequency = 440; // 440 hz, middle  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);     startsound = (button) this.findviewbyid(r.id.startsound);     startsound.setonclicklistener(this);     endsound = (button) this.findviewbyid(r.id.endsound);     endsound.setonclicklistener(this);     endsound.setenabled(false); }  @override public void onpause() {     super.onpause();     keepgoing = false;     endsound.setenabled(false);     startsound.setenabled(true); }  public void onclick(view v) {     if (v == startsound) {         keepgoing = true;         audiosynth = new audiosynthesistask();         audiosynth.execute();         endsound.setenabled(true);         startsound.setenabled(false);     } else if (v == endsound) {         keepgoing = false;         endsound.setenabled(false);         startsound.setenabled(true);     } }  private class audiosynthesistask extends asynctask<void, void, void> {     @override     protected void doinbackground(void... params) {         final int sample_rate= 11025;         int minsize = audiotrack.getminbuffersize(sample_rate,                 audioformat.channel_configuration_mono,                 audioformat.encoding_pcm_16bit);         audiotrack audiotrack = new audiotrack(audiomanager.stream_music,             sample_rate,             audioformat.channel_configuration_mono,             audioformat.encoding_pcm_16bit,             minsize,             audiotrack.mode_stream);     audiotrack.play();     short[] buffer = new short[minsize];     float angular_frequency =        (float)(2*math.pi) * synth_frequency / sample_rate;     float angle = 0;     while (keepgoing) {          (int = 0; < buffer.length; i++)          {              buffer[i] = (short)(short.max_value * ((float) math.sin(angle)));              angle += angular_frequency;          }          audiotrack.write(buffer, 0, buffer.length);     }     return null; } } }

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