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Code Issues Actions Packages Projects Releases Wiki Activity

show frequency plot

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This commit is contained in:
Ahmet Inan 2024-04-26 13:20:06 +02:00
parent 1733dd9aad
commit 774bcf9f18
3 changed files with 50 additions and 10 deletions
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37
app/src/main/java/xdsopl/robot36/MainActivity.java
View file

@ -32,6 +32,7 @@ import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@ -39,6 +40,9 @@ public class MainActivity extends AppCompatActivity {
private Bitmap scopeBitmap;
private PixelBuffer scopeBuffer;
private ImageView scopeView;
private Bitmap freqPlotBitmap;
private PixelBuffer freqPlotBuffer;
private ImageView freqPlotView;
private float[] recordBuffer;
private AudioRecord audioRecord;
private Decoder decoder;
@ -65,16 +69,39 @@ public class MainActivity extends AppCompatActivity {
public void onPeriodicNotification(AudioRecord audioRecord) {
audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
if (decoder.process(recordBuffer, recordChannel)) {
processScope();
processFreqPlot();
setStatus(decoder.lastMode.getName());
}
}
};
private void processFreqPlot() {
int width = freqPlotBitmap.getWidth();
int height = freqPlotBitmap.getHeight();
int stride = freqPlotBuffer.width;
int line = stride * freqPlotBuffer.line;
int channels = recordChannel > 0 ? 2 : 1;
Arrays.fill(freqPlotBuffer.pixels, line, line + stride, 0);
for (int i = 0; i < recordBuffer.length / channels; ++i) {
int x = Math.min(Math.max(Math.round((recordBuffer[i] + 3) * stride / 6), 0), stride - 1);
freqPlotBuffer.pixels[line + x] = tint;
}
System.arraycopy(freqPlotBuffer.pixels, line, freqPlotBuffer.pixels, line + stride * (freqPlotBuffer.height / 2), stride);
freqPlotBuffer.line = (freqPlotBuffer.line + 1) % (freqPlotBuffer.height / 2);
int offset = stride * (freqPlotBuffer.line + freqPlotBuffer.height / 2 - height);
freqPlotBitmap.setPixels(freqPlotBuffer.pixels, offset, stride, 0, 0, width, height);
freqPlotView.invalidate();
}
private void processScope() {
int width = scopeBitmap.getWidth();
int height = scopeBitmap.getHeight();
int stride = scopeBuffer.width;
int offset = stride * (scopeBuffer.line + scopeBuffer.height / 2 - height);
scopeBitmap.setPixels(scopeBuffer.pixels, offset, stride, 0, 0, width, height);
scopeView.invalidate();
setStatus(decoder.lastMode.getName());
}
}
};
private void initAudioRecord() {
boolean rateChanged = true;
@ -280,6 +307,10 @@ public class MainActivity extends AppCompatActivity {
scopeView = findViewById(R.id.scope);
scopeBuffer = new PixelBuffer(640, 2 * 1280);
createScope(getResources().getConfiguration());
freqPlotView = findViewById(R.id.freq_plot);
freqPlotBuffer = new PixelBuffer(640, 2 * 640);
freqPlotBitmap = Bitmap.createBitmap(freqPlotBuffer.width, freqPlotBuffer.height / 2, Bitmap.Config.ARGB_8888);
freqPlotView.setImageBitmap(freqPlotBitmap);
List<String> permissions = new ArrayList<>();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.RECORD_AUDIO);

14
app/src/main/res/layout/activity_main.xml
View file

@ -3,9 +3,9 @@
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:keepScreenOn="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:keepScreenOn="true"
tools:context=".MainActivity">
<ImageView
@ -14,9 +14,17 @@
android:layout_height="0dp"
android:contentDescription="@string/scope_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintEnd_toStartOf="@+id/freq_plot"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/freq_plot"
android:layout_width="0dp"
android:layout_height="0dp"
android:contentDescription="@string/freq_plot_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/scope"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

3
app/src/main/res/values/strings.xml
View file

@ -24,7 +24,8 @@
<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>
<string name="scope_description">Decoded SSTV picture</string>
<string name="freq_plot_description">Frequency plot</string>
<string name="night_mode">Night Mode</string>
<string name="enable">Enable</string>
<string name="disable">Disable</string>