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added scan line buffer processing

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This commit is contained in:
Ahmet Inan 2024-04-17 07:30:43 +02:00
parent 64b0732bdb
commit 889418fd2c
1 changed files with 28 additions and 25 deletions
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53
app/src/main/java/xdsopl/robot36/MainActivity.java
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@ -30,18 +30,19 @@ import java.util.List;
public class MainActivity extends AppCompatActivity {
private final int scopeWidth = 1234, scopeHeight = 512;
private final int scopeWidth = 320, scopeHeight = 640;
private Bitmap scopeBitmap;
private int[] scopePixels;
private ImageView scopeView;
private float[] recordBuffer;
private float[] scanLineBuffer;
private AudioRecord audioRecord;
private TextView status;
private Demodulator demodulator;
private int tint;
private int curLine;
private int curColumn;
private int curSample;
private void setStatus(int id) {
status.setText(id);
@ -59,7 +60,13 @@ public class MainActivity extends AppCompatActivity {
}
};
private void slideUpOneLine() {
private void processOneLine(int syncPulseIndex) {
for (int i = 0; i < scopeWidth; ++i) {
int position = (i * syncPulseIndex) / scopeWidth;
int intensity = (int) Math.round(255 * Math.sqrt(scanLineBuffer[position]));
int pixelColor = 0xff000000 | 0x00010101 * intensity;
scopePixels[scopeWidth * curLine + i] = pixelColor;
}
for (int i = 0; i < scopeWidth; ++i)
scopePixels[scopeWidth * (curLine + scopeHeight) + i] = scopePixels[scopeWidth * curLine + i];
curLine = (curLine + 1) % scopeHeight;
@ -68,35 +75,31 @@ public class MainActivity extends AppCompatActivity {
}
private void visualizeSignal(boolean syncPulseDetected) {
int syncPulseOffset = curColumn + demodulator.syncPulseOffset;
if (syncPulseDetected && syncPulseOffset >= 0 && syncPulseOffset < curColumn) {
syncPulseDetected = false;
int nextLine = (curLine + 1) % scopeHeight;
for (int i = 0; i < curColumn - syncPulseOffset; ++i)
scopePixels[scopeWidth * nextLine + i] = scopePixels[scopeWidth * curLine + syncPulseOffset + i];
for (int i = syncPulseOffset; i < scopeWidth; ++i)
scopePixels[scopeWidth * curLine + i] = 0xff00ff00;
curColumn -= syncPulseOffset;
slideUpOneLine();
}
int syncPulseIndex = curSample + demodulator.syncPulseOffset;
for (float v : recordBuffer) {
int intensity = (int) Math.round(255 * Math.sqrt(v));
int pixelColor = 0xff000000 | 0x00010101 * intensity;
scopePixels[scopeWidth * curLine + curColumn] = pixelColor;
boolean syncNow = syncPulseDetected && syncPulseOffset == curColumn;
if (syncNow || ++curColumn >= scopeWidth) {
if (syncNow)
while (curColumn < scopeWidth)
scopePixels[scopeWidth * curLine + curColumn++] = 0xffff0000;
syncPulseDetected = false;
curColumn = 0;
slideUpOneLine();
scanLineBuffer[curSample++] = v;
if (curSample >= scanLineBuffer.length) {
int shift = scanLineBuffer.length / 2;
syncPulseIndex -= shift;
curSample = 0;
for (int i = shift; i < scanLineBuffer.length; ++i)
scanLineBuffer[curSample++] = scanLineBuffer[i];
}
}
if (syncPulseDetected && syncPulseIndex >= 0) {
processOneLine(syncPulseIndex);
int count = curSample - syncPulseIndex;
curSample = 0;
for (int i = 0; i < count; ++i)
scanLineBuffer[curSample++] = scanLineBuffer[syncPulseIndex + i];
}
}
void initTools(int sampleRate) {
demodulator = new Demodulator(sampleRate);
double scanLineMaxSeconds = 0.500;
int scanLineMaxSamples = (int) Math.round(scanLineMaxSeconds * sampleRate);
scanLineBuffer = new float[scanLineMaxSamples];
}
private void initAudioRecord() {