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AudioSoundPlayer object for the Piano Tutorial on the SSaurel's Channel
package com.ssaurel.piano;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.util.SparseArray;
import java.io.InputStream;
/**
* Created by ssaurel on 15/03/2018.
*/
public class AudioSoundPlayer {
private SparseArray<PlayThread> threadMap = null;
private Context context;
private static final SparseArray<String> SOUND_MAP = new SparseArray<>();
public static final int MAX_VOLUME = 100, CURRENT_VOLUME = 90;
static {
// white keys sounds
SOUND_MAP.put(1, "note_do");
SOUND_MAP.put(2, "note_re");
SOUND_MAP.put(3, "note_mi");
SOUND_MAP.put(4, "note_fa");
SOUND_MAP.put(5, "note_sol");
SOUND_MAP.put(6, "note_la");
SOUND_MAP.put(7, "note_si");
SOUND_MAP.put(8, "second_do");
SOUND_MAP.put(9, "second_re");
SOUND_MAP.put(10, "second_mi");
SOUND_MAP.put(11, "second_fa");
SOUND_MAP.put(12, "second_sol");
SOUND_MAP.put(13, "second_la");
SOUND_MAP.put(14, "second_si");
// black keys sounds
SOUND_MAP.put(15, "do_dies");
SOUND_MAP.put(16, "re_dies");
SOUND_MAP.put(17, "fa_dies");
SOUND_MAP.put(18, "sol_dies");
SOUND_MAP.put(19, "la_dies");
SOUND_MAP.put(20, "second_dies_do");
SOUND_MAP.put(21, "second_dies_re");
SOUND_MAP.put(22, "second_dies_fa");
SOUND_MAP.put(23, "second_dies_sol");
SOUND_MAP.put(24, "second_dies_la");
}
public AudioSoundPlayer(Context context) {
this.context = context;
threadMap = new SparseArray<>();
}
public void playNote(int note) {
if (!isNotePlaying(note)) {
PlayThread thread = new PlayThread(note);
thread.start();
threadMap.put(note, thread);
}
}
public void stopNote(int note) {
PlayThread thread = threadMap.get(note);
if (thread != null) {
threadMap.remove(note);
}
}
public boolean isNotePlaying(int note) {
return threadMap.get(note) != null;
}
private class PlayThread extends Thread {
int note;
AudioTrack audioTrack;
public PlayThread(int note) {
this.note = note;
}
@Override
public void run() {
try {
String path = SOUND_MAP.get(note) + ".wav";
AssetManager assetManager = context.getAssets();
AssetFileDescriptor ad = assetManager.openFd(path);
long fileSize = ad.getLength();
int bufferSize = 4096;
byte[] buffer = new byte[bufferSize];
audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, bufferSize, AudioTrack.MODE_STREAM);
float logVolume = (float) (1 - (Math.log(MAX_VOLUME - CURRENT_VOLUME) / Math.log(MAX_VOLUME)));
audioTrack.setStereoVolume(logVolume, logVolume);
audioTrack.play();
InputStream audioStream = null;
int headerOffset = 0x2C; long bytesWritten = 0; int bytesRead = 0;
audioStream = assetManager.open(path);
audioStream.read(buffer, 0, headerOffset);
while (bytesWritten < fileSize - headerOffset) {
bytesRead = audioStream.read(buffer, 0, bufferSize);
bytesWritten += audioTrack.write(buffer, 0, bytesRead);
}
audioTrack.stop();
audioTrack.release();
} catch (Exception e) {
} finally {
if (audioTrack != null) {
audioTrack.release();
}
}
}
}
}
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