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added simple scope for experimentation

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This commit is contained in:
Ahmet Inan 2024-04-12 23:30:01 +02:00
parent 7d3b46a396
commit e690c6aecf
5 changed files with 49 additions and 3 deletions
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31
app/src/main/java/xdsopl/robot36/MainActivity.java
View file

@ -7,11 +7,13 @@ Copyright 2024 Ahmet Inan <xdsopl@gmail.com>
package xdsopl.robot36;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.Manifest;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.activity.EdgeToEdge;
@ -28,9 +30,15 @@ import java.util.List;
public class MainActivity extends AppCompatActivity {
private final int scopeWidth = 256, scopeHeight = 256;
private Bitmap scopeBitmap;
private int[] scopePixels;
private ImageView scopeView;
private float[] recordBuffer;
private AudioRecord audioRecord;
private TextView status;
private int tint;
private int curLine;
private void setStatus(int id) {
status.setText(id);
@ -44,9 +52,25 @@ public class MainActivity extends AppCompatActivity {
@Override
public void onPeriodicNotification(AudioRecord audioRecord) {
audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
processSamples();
}
};
private void processSamples() {
for (float v : recordBuffer) {
int x = Math.min((int) (scopeWidth * v * v), scopeWidth);
for (int i = 0; i < x; ++i)
scopePixels[scopeWidth * curLine + i] = tint;
for (int i = x; i < scopeWidth; ++i)
scopePixels[scopeWidth * curLine + i] = 0;
for (int i = 0; i < scopeWidth; ++i)
scopePixels[scopeWidth * (curLine + scopeHeight) + i] = scopePixels[scopeWidth * curLine + i];
curLine = (curLine + 1) % scopeHeight;
}
scopeBitmap.setPixels(scopePixels, scopeWidth * curLine, scopeWidth, 0, 0, scopeWidth, scopeHeight);
scopeView.invalidate();
}
private void initAudioRecord() {
int audioSource = MediaRecorder.AudioSource.UNPROCESSED;
int channelConfig = AudioFormat.CHANNEL_IN_MONO;
@ -113,7 +137,12 @@ public class MainActivity extends AppCompatActivity {
v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
return insets;
});
status = (TextView) findViewById(R.id.status);
tint = getColor(R.color.tint);
status = findViewById(R.id.status);
scopeView = findViewById(R.id.scope);
scopeBitmap = Bitmap.createBitmap(scopeWidth, scopeHeight, Bitmap.Config.ARGB_8888);
scopeView.setImageBitmap(scopeBitmap);
scopePixels = new int[2 * scopeWidth * scopeHeight];
List<String> permissions = new ArrayList<>();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.RECORD_AUDIO);

13
app/src/main/res/layout/activity_main.xml
View file

@ -8,6 +8,16 @@
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageView
android:id="@+id/scope"
android:layout_width="0dp"
android:layout_height="0dp"
android:contentDescription="@string/scope_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/status"
android:layout_width="wrap_content"
@ -15,7 +25,6 @@
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

6
app/src/main/res/values-night/colors.xml Normal file
View file

@ -0,0 +1,6 @@
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="black">#FF000000</color>
<color name="white">#FFFFFFFF</color>
<color name="tint">#FFFFFFFF</color>
</resources>

1
app/src/main/res/values/colors.xml
View file

@ -2,4 +2,5 @@
<resources>
<color name="black">#FF000000</color>
<color name="white">#FFFFFFFF</color>
<color name="tint">#FF000000</color>
</resources>

1
app/src/main/res/values/strings.xml
View file

@ -5,4 +5,5 @@
<string name="audio_setup_failed">audio setup failed</string>
<string name="audio_permission_denied">audio permission denied</string>
<string name="audio_recording_error">audio recording error</string>
<string name="scope_description">visualization of audio signal</string>
</resources>