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added simple peak meter

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This commit is contained in:
Ahmet Inan 2024-04-26 17:01:54 +02:00
parent 9b32ac8924
commit 63b3098998
4 changed files with 54 additions and 2 deletions
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31
app/src/main/java/xdsopl/robot36/MainActivity.java
View file

@ -43,6 +43,9 @@ public class MainActivity extends AppCompatActivity {
private Bitmap freqPlotBitmap;
private PixelBuffer freqPlotBuffer;
private ImageView freqPlotView;
private Bitmap peakMeterBitmap;
private PixelBuffer peakMeterBuffer;
private ImageView peakMeterView;
private float[] recordBuffer;
private AudioRecord audioRecord;
private Decoder decoder;
@ -51,6 +54,7 @@ public class MainActivity extends AppCompatActivity {
private int recordChannel;
private int audioSource;
private int tint;
private int thin;
private void setStatus(int id) {
setTitle(id);
@ -68,6 +72,7 @@ public class MainActivity extends AppCompatActivity {
@Override
public void onPeriodicNotification(AudioRecord audioRecord) {
audioRecord.read(recordBuffer, 0, recordBuffer.length, AudioRecord.READ_BLOCKING);
processPeakMeter();
boolean newLines = decoder.process(recordBuffer, recordChannel);
processFreqPlot();
if (newLines) {
@ -77,6 +82,18 @@ public class MainActivity extends AppCompatActivity {
}
};
private void processPeakMeter() {
float max = 0;
for (float v : recordBuffer)
max = Math.max(max, Math.abs(v));
int pixels = peakMeterBuffer.height;
int peak = Math.min(Math.max(Math.round(max * pixels), 0), pixels);
Arrays.fill(peakMeterBuffer.pixels, 0, pixels - peak, thin);
Arrays.fill(peakMeterBuffer.pixels, pixels - peak, pixels, tint);
peakMeterBitmap.setPixels(peakMeterBuffer.pixels, 0, peakMeterBuffer.width, 0, 0, peakMeterBuffer.width, peakMeterBuffer.height);
peakMeterView.invalidate();
}
private void processFreqPlot() {
int width = freqPlotBitmap.getWidth();
int height = freqPlotBitmap.getHeight();
@ -302,10 +319,13 @@ public class MainActivity extends AppCompatActivity {
setContentView(config.orientation == Configuration.ORIENTATION_LANDSCAPE ? R.layout.activity_main_land : R.layout.activity_main);
handleInsets();
tint = getColor(R.color.tint);
thin = getColor(R.color.thin);
scopeBuffer = new PixelBuffer(640, 2 * 1280);
createScope(config);
freqPlotBuffer = new PixelBuffer(640, 2 * 640);
createFreqPlot(config);
peakMeterBuffer = new PixelBuffer(1, 16);
createPeakMeter();
List<String> permissions = new ArrayList<>();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
permissions.add(Manifest.permission.RECORD_AUDIO);
@ -427,6 +447,7 @@ public class MainActivity extends AppCompatActivity {
int offset = stride * (scopeBuffer.line + scopeBuffer.height / 2 - height);
scopeBitmap.setPixels(scopeBuffer.pixels, offset, stride, 0, 0, width, height);
scopeView = findViewById(R.id.scope);
scopeView.setScaleType(ImageView.ScaleType.FIT_CENTER);
scopeView.setImageBitmap(scopeBitmap);
}
@ -440,9 +461,18 @@ public class MainActivity extends AppCompatActivity {
int offset = stride * (freqPlotBuffer.line + freqPlotBuffer.height / 2 - height);
freqPlotBitmap.setPixels(freqPlotBuffer.pixels, offset, stride, 0, 0, width, height);
freqPlotView = findViewById(R.id.freq_plot);
freqPlotView.setScaleType(ImageView.ScaleType.FIT_CENTER);
freqPlotView.setImageBitmap(freqPlotBitmap);
}
private void createPeakMeter() {
peakMeterBitmap = Bitmap.createBitmap(peakMeterBuffer.width, peakMeterBuffer.height, Bitmap.Config.ARGB_8888);
peakMeterBitmap.setPixels(peakMeterBuffer.pixels, 0, peakMeterBuffer.width, 0, 0, peakMeterBuffer.width, peakMeterBuffer.height);
peakMeterView = findViewById(R.id.peak_meter);
peakMeterView.setScaleType(ImageView.ScaleType.FIT_XY);
peakMeterView.setImageBitmap(peakMeterBitmap);
}
@Override
public void onConfigurationChanged(@NonNull Configuration config) {
super.onConfigurationChanged(config);
@ -450,6 +480,7 @@ public class MainActivity extends AppCompatActivity {
handleInsets();
createScope(config);
createFreqPlot(config);
createPeakMeter();
}
private void showTextPage(String title, String message) {

12
app/src/main/res/layout/activity_main.xml
View file

@ -24,7 +24,17 @@
android:layout_height="wrap_content"
android:contentDescription="@string/freq_plot_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintEnd_toStartOf="@+id/peak_meter"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/scope" />
<ImageView
android:id="@+id/peak_meter"
android:layout_width="16dp"
android:layout_height="0dp"
android:contentDescription="@string/peak_meter_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/freq_plot"
app:layout_constraintTop_toBottomOf="@+id/scope" />
</androidx.constraintlayout.widget.ConstraintLayout>

12
app/src/main/res/layout/activity_main_land.xml
View file

@ -24,7 +24,17 @@
android:layout_height="0dp"
android:contentDescription="@string/freq_plot_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintEnd_toStartOf="@+id/peak_meter"
app:layout_constraintStart_toEndOf="@+id/scope"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/peak_meter"
android:layout_width="16dp"
android:layout_height="0dp"
android:contentDescription="@string/peak_meter_description"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/freq_plot"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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

@ -26,6 +26,7 @@
<string name="audio_recording_error">Audio recording error</string>
<string name="scope_description">Decoded SSTV picture</string>
<string name="freq_plot_description">Frequency plot</string>
<string name="peak_meter_description">Peak audio signal level</string>
<string name="night_mode">Night Mode</string>
<string name="enable">Enable</string>
<string name="disable">Disable</string>