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added Scottie decoder

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This commit is contained in:
Ahmet Inan 2024-04-20 09:18:14 +02:00
parent 705a49d214
commit dc07b809ae
1 changed files with 20 additions and 3 deletions
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23
app/src/main/java/xdsopl/robot36/Scottie.java
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@ -8,6 +8,11 @@ package xdsopl.robot36;
public class Scottie implements Mode { public class Scottie implements Mode {
private final int scanLineSamples; private final int scanLineSamples;
private final int channelSamples;
private final int greenBeginSamples;
private final int blueBeginSamples;
private final int redBeginSamples;
private final int redEndSamples;
private final String name; private final String name;
Scottie(String name, double channelSeconds, int sampleRate) { Scottie(String name, double channelSeconds, int sampleRate) {
@ -16,6 +21,15 @@ public class Scottie implements Mode {
double separatorSeconds = 0.0015; double separatorSeconds = 0.0015;
double scanLineSeconds = syncPulseSeconds + 3 * (channelSeconds + separatorSeconds); double scanLineSeconds = syncPulseSeconds + 3 * (channelSeconds + separatorSeconds);
scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate); scanLineSamples = (int) Math.round(scanLineSeconds * sampleRate);
channelSamples = (int) Math.round(channelSeconds * sampleRate);
double blueBeginSeconds = -(syncPulseSeconds / 2 + channelSeconds);
blueBeginSamples = (int) Math.round(blueBeginSeconds * sampleRate);
double greenBeginSeconds = blueBeginSeconds - (separatorSeconds + channelSeconds);
greenBeginSamples = (int) Math.round(greenBeginSeconds * sampleRate);
double redBeginSeconds = syncPulseSeconds / 2 + separatorSeconds;
redBeginSamples = (int) Math.round(redBeginSeconds * sampleRate);
double redEndSeconds = redBeginSeconds + channelSeconds;
redEndSamples = (int) Math.round(redEndSeconds * sampleRate);
} }
@Override @Override
@ -30,11 +44,14 @@ public class Scottie implements Mode {
@Override @Override
public int decodeScanLine(int[] evenBuffer, int[] oddBuffer, float[] scanLineBuffer, int prevPulseIndex, int scanLineSamples) { public int decodeScanLine(int[] evenBuffer, int[] oddBuffer, float[] scanLineBuffer, int prevPulseIndex, int scanLineSamples) {
if (prevPulseIndex < 0 || prevPulseIndex + scanLineSamples >= scanLineBuffer.length) if (prevPulseIndex + greenBeginSamples < 0 || prevPulseIndex + redEndSamples > scanLineBuffer.length)
return 0; return 0;
for (int i = 0; i < evenBuffer.length; ++i) { for (int i = 0; i < evenBuffer.length; ++i) {
int position = (i * scanLineSamples) / evenBuffer.length + prevPulseIndex; int position = (i * channelSamples) / evenBuffer.length + prevPulseIndex;
evenBuffer[i] = ColorConverter.GRAY(scanLineBuffer[position]); int redPos = position + redBeginSamples;
int greenPos = position + greenBeginSamples;
int bluePos = position + blueBeginSamples;
evenBuffer[i] = ColorConverter.RGB(scanLineBuffer[redPos], scanLineBuffer[greenPos], scanLineBuffer[bluePos]);
} }
return 1; return 1;
} }