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package com.example.greenwatch; |
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import androidx.appcompat.app.AppCompatActivity; |
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import androidx.core.app.ActivityCompat; |
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import androidx.core.content.ContextCompat; |
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import android.Manifest; |
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import android.content.Context; |
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import android.content.SharedPreferences; |
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import android.content.pm.PackageManager; |
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import android.media.AudioFormat; |
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import android.media.AudioRecord; |
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import android.media.MediaRecorder; |
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import android.os.AsyncTask; |
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import android.os.Bundle; |
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import android.widget.TextView; |
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import java.text.SimpleDateFormat; |
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import java.util.Date; |
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public class Mikrofon extends AppCompatActivity { |
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private AufnahmeTask aufnahmeTask; |
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private TextView textViewMaxAmp; |
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private TextView textViewMaxAmpdb; |
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private TextView textViewZeitstempel; |
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private static final int RECHTEANFORDERUNG_MIKROFON = 1; |
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private boolean detection_mic = false; |
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private String zeit = "0"; |
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private boolean kalibrierung_do; |
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private float threshold = 40; |
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private float sensitivity = 5; |
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private final static String KEY_WERT = "KEY_WERT_" + Mikrofon.class.getSimpleName(); |
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private final static String KEY_KALIBRIERUNG = "KEY_KALIBRIERUNG_" + Mikrofon.class.getSimpleName(); |
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@Override |
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protected void onCreate(Bundle savedInstanceState) { |
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super.onCreate(savedInstanceState); |
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setContentView(R.layout.activity_mikrofon); |
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textViewMaxAmp = (TextView) findViewById(R.id.textViewMaxAmp); |
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textViewMaxAmpdb = (TextView) findViewById(R.id.textViewMaxAmpdb); |
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textViewZeitstempel = (TextView) findViewById(R.id.textViewZeitstempel); |
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//kalibrierung_do = true; |
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} |
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@Override |
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protected void onResume() { |
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super.onResume(); |
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SharedPreferences p = getPreferences(Context.MODE_PRIVATE); |
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threshold = p.getFloat(KEY_WERT, 40); |
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kalibrierung_do = p.getBoolean(KEY_KALIBRIERUNG, true); |
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if (!istZugriffAufMikrofonErlaubt()) { |
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zugriffAufMikrofonAnfordern(); |
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} |
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if (istZugriffAufMikrofonErlaubt()) { |
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aufnahmeTask = new AufnahmeTask(); |
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aufnahmeTask.execute(); |
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} |
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} |
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@Override |
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protected void onPause() { |
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super.onPause(); |
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SharedPreferences p = getPreferences(Context.MODE_PRIVATE); |
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SharedPreferences.Editor editor = p.edit(); |
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editor.putFloat(KEY_WERT, threshold); |
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if(isFinishing()==true){ |
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editor.putBoolean(KEY_KALIBRIERUNG, true); |
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}else { |
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editor.putBoolean(KEY_KALIBRIERUNG, false); |
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} |
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editor.commit(); |
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if(aufnahmeTask!=null) { |
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aufnahmeTask.cancel(true); |
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aufnahmeTask = null; |
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} |
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} |
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private boolean istZugriffAufMikrofonErlaubt() { |
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if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) { |
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return false; |
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} else { |
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return true; |
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} |
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} |
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private void zugriffAufMikrofonAnfordern() { |
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ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, RECHTEANFORDERUNG_MIKROFON); |
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} |
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public static String Zeitpunkt(){ |
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Long tslong = System.currentTimeMillis(); |
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SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss"); |
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Date date = new Date(tslong); |
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String resultdate = sdf.format(date); |
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return resultdate; |
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} |
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class AufnahmeTask extends AsyncTask<Long, Verarbeitungsergebnis, Void> { |
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private AudioRecord recorder; |
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private final int sampleRateInHz = 44100; |
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private final int channelConfig = AudioFormat.CHANNEL_IN_MONO; |
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private final int audioFormat = AudioFormat.ENCODING_PCM_16BIT; |
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private int minPufferGroesseInBytes; |
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private int pufferGroesseInBytes; |
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private RingPuffer ringPuffer = new RingPuffer(10); |
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AufnahmeTask() { |
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minPufferGroesseInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); |
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pufferGroesseInBytes = minPufferGroesseInBytes * 2; |
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recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, pufferGroesseInBytes); |
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int anzahlBytesProAbtastwert; |
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String s; |
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switch (recorder.getAudioFormat()) { |
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case AudioFormat.ENCODING_PCM_8BIT: |
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s = "8 Bit PCM "; |
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anzahlBytesProAbtastwert = 1; |
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break; |
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case AudioFormat.ENCODING_PCM_16BIT: |
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s = "16 Bit PCM"; |
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anzahlBytesProAbtastwert = 2; |
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break; |
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case AudioFormat.ENCODING_PCM_FLOAT: |
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s = "Float PCM"; |
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anzahlBytesProAbtastwert = 4; |
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break; |
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default: |
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throw new IllegalArgumentException(); |
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} |
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switch (recorder.getChannelConfiguration()) { |
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case AudioFormat.CHANNEL_IN_MONO: |
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s = "Mono"; |
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break; |
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case AudioFormat.CHANNEL_IN_STEREO: |
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s = "Stereo"; |
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anzahlBytesProAbtastwert *= 2; |
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break; |
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case AudioFormat.CHANNEL_INVALID: |
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s = "ungültig"; |
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break; |
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default: |
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throw new IllegalArgumentException(); |
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} |
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} |
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@Override |
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protected Void doInBackground(Long... params) { |
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recorder.startRecording(); |
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short[] puffer = new short[pufferGroesseInBytes / 2]; |
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long lastTime = System.currentTimeMillis(); |
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float verarbeitungsrate = 0; |
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final int maxZaehlerZeitMessung = 10; |
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int zaehlerZeitMessung = 0; |
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int anzahlVerarbeitet = 0; |
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GleitenderMittelwert gleitenderMittelwert = new GleitenderMittelwert(0.3f); |
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GleitenderMittelwert gleitenderMittelwertdB = new GleitenderMittelwert(0.1f); |
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float db = 0; |
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boolean erlaubt_rise = true; |
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boolean erlaubt_fall = true; |
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for (; ; ) { |
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if (isCancelled()) { |
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break; |
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} else { |
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int n = recorder.read(puffer, 0, puffer.length); |
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Verarbeitungsergebnis ergebnis = verarbeiten(puffer, n); |
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anzahlVerarbeitet += n; |
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//kalibrierung |
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if(kalibrierung_do){ |
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// Warten für 3 Sekunden |
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/*long startTime = System.currentTimeMillis(); // Startzeit |
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while (System.currentTimeMillis() - startTime < 3000) { |
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//Warten |
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}*/ |
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//3s warten auf weitere Ausführung |
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try { |
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Thread.sleep(3000); |
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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//int z = recorder.read(puffer, 0, puffer.length); |
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//Verarbeitungsergebnis kalibrierung = verarbeiten(puffer, z); |
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int anzahlIterationen = 3000; |
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float sum = 0; |
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for(int i = 0; i < anzahlIterationen; i++){ |
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sum += ergebnis.db; |
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} |
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threshold = sum/anzahlIterationen; |
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kalibrierung_do = false; |
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} |
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zaehlerZeitMessung++; |
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if (zaehlerZeitMessung == maxZaehlerZeitMessung) { |
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long time = System.currentTimeMillis(); |
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long deltaTime = time - lastTime; |
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verarbeitungsrate = 1000.0f * anzahlVerarbeitet / deltaTime; |
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verarbeitungsrate = gleitenderMittelwert.mittel(verarbeitungsrate); |
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zaehlerZeitMessung = 0; |
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anzahlVerarbeitet = 0; |
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lastTime = time; |
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} |
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db = (float) ergebnis.db; |
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db = gleitenderMittelwertdB.mittel(db); |
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ergebnis.db = (int) db; |
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ergebnis.verarbeitungsrate = (int) verarbeitungsrate; |
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//Hysterese beim Setzen bzw. Rücksetzen ob detektiert |
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//beim ersten detektieren wird Zeitpunkt gespeichert |
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if(ergebnis.db >= (threshold+sensitivity)){ |
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detection_mic = true; |
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erlaubt_fall = true; |
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while(erlaubt_rise){ |
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erlaubt_rise = false; |
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zeit = Zeitpunkt() + " - " + ergebnis.db + " - " + (threshold+sensitivity); //Überschreiben des Zeitpunkts beim Erkennen der Detektion |
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//nur zum Testen in zeit noch ergebnis.db und threshold ausgegeben -> muss am Ende nur Zeitpunkt() rein, Rest weg |
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} |
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} else if (ergebnis.db <= (threshold)) { |
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detection_mic = false; |
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erlaubt_rise = true; |
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while(erlaubt_fall){ |
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erlaubt_fall = false; |
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zeit = Zeitpunkt(); //erneutes Überschreiben des Zeitpunkts beim Verschwinden der Detektion |
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} |
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} |
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publishProgress(ergebnis); |
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try { |
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Thread.sleep(10); |
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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} |
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} |
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recorder.release(); |
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return null; |
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} |
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private Verarbeitungsergebnis verarbeiten(short[] daten, int n) { |
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String status; |
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short maxAmp = -1; |
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int db = 0; |
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if (n == AudioRecord.ERROR_INVALID_OPERATION) { |
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status = "ERROR_INVALID_OPERATION"; |
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} else if (n == AudioRecord.ERROR_BAD_VALUE) { |
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status = "ERROR_BAD_VALUE"; |
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} else { |
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status = "OK"; |
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short max = 0; |
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for (int i = 0; i < n; i++) { |
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if (daten[i] > max) { |
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max = daten[i]; |
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} |
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} |
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ringPuffer.hinzufuegen(max); |
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maxAmp = ringPuffer.maximum(); |
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} |
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//Umwandlung Amplitudenwert in dB |
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db = (int) (20*Math.log10(maxAmp)); |
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return new Verarbeitungsergebnis(status, maxAmp,0, db); |
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} |
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///////////////////////////////////////////// |
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@Override |
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protected void onProgressUpdate(Verarbeitungsergebnis... progress) { |
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super.onProgressUpdate(progress); |
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System.out.println(detection_mic); |
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System.out.println(zeit); |
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textViewZeitstempel.setText(zeit); |
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textViewMaxAmpdb.setText("" + progress[0].db); |
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textViewMaxAmp.setText("" + progress[0].maxAmp); |
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} |
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} |
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///////////////////////////////////////////// |
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class Verarbeitungsergebnis { |
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String status; |
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short maxAmp; |
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int db; |
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int verarbeitungsrate; |
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Verarbeitungsergebnis(String status, short maxAmp, int verarbeitungsrate, int db) { |
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this.status = status; |
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this.maxAmp = maxAmp; |
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this.db = db; |
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this.verarbeitungsrate = verarbeitungsrate; |
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} |
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} |
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class RingPuffer { |
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private short[] puffer; |
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private final int laenge; |
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private int anzahlEnthaltenerDaten; |
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private int position; |
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public RingPuffer(int n) { |
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laenge = n; |
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anzahlEnthaltenerDaten = 0; |
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position = 0; |
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puffer = new short[laenge]; |
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} |
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public void hinzufuegen(short wert) { |
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puffer[position] = wert; |
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position++; |
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if (position >= laenge) { |
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position = 0; |
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} |
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if (anzahlEnthaltenerDaten < laenge) { |
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anzahlEnthaltenerDaten++; |
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} |
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} |
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public void hinzufuegen(short[] daten) { |
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for (short d : daten) { |
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puffer[position] = d; |
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position++; |
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if (position >= laenge) { |
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position = 0; |
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} |
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} |
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if (anzahlEnthaltenerDaten < laenge) { |
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anzahlEnthaltenerDaten += daten.length; |
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if (anzahlEnthaltenerDaten >= laenge) { |
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anzahlEnthaltenerDaten = laenge; |
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} |
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} |
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} |
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public short maximum() { |
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short max = 0; |
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for (int i = 0; i < anzahlEnthaltenerDaten; i++) { |
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if (puffer[i] > max) { |
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max = puffer[i]; |
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} |
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} |
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return max; |
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} |
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public float mittelwert() { |
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float summe = 0; |
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for (int i = 0; i < anzahlEnthaltenerDaten; i++) { |
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summe += puffer[i]; |
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} |
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return summe / anzahlEnthaltenerDaten; |
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} |
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} |
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class GleitenderMittelwert { |
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private final float wichtungNeuerWert; |
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private final float wichtungAlterWert; |
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private float mittelwert = 0; |
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private boolean istMittelwertGesetzt = false; |
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GleitenderMittelwert(float wichtungNeuerWert) { |
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this.wichtungNeuerWert = wichtungNeuerWert; |
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this.wichtungAlterWert = 1 - this.wichtungNeuerWert; |
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} |
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float mittel(float wert) { |
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if (istMittelwertGesetzt) { |
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mittelwert = wert * wichtungNeuerWert + mittelwert * wichtungAlterWert; |
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} else { |
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mittelwert = wert; |
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istMittelwertGesetzt = true; |
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} |
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return mittelwert; |
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} |
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} |
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} |