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git-svn-id: https://zxing.googlecode.com/svn/trunk@891 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2009-03-12 21:10:53 +00:00
parent de31f7a387
commit 64686b9fb1
1 changed files with 28 additions and 20 deletions
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48
javame/src/com/google/zxing/client/j2me/SnapshotThread.java
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@ -38,6 +38,7 @@ final class SnapshotThread implements Runnable {
private final Object waitLock; private final Object waitLock;
private volatile boolean done; private volatile boolean done;
private final MultimediaManager multimediaManager; private final MultimediaManager multimediaManager;
private String bestEncoding;
SnapshotThread(ZXingMIDlet zXingMIDlet) { SnapshotThread(ZXingMIDlet zXingMIDlet) {
this.zXingMIDlet = zXingMIDlet; this.zXingMIDlet = zXingMIDlet;
@ -92,30 +93,12 @@ final class SnapshotThread implements Runnable {
private byte[] takeSnapshot() throws MediaException { private byte[] takeSnapshot() throws MediaException {
// Check this property, present on some Nokias? String bestEncoding = guessBestEncoding();
String supportsVideoCapture = System.getProperty("supports.video.capture");
if ("false".equals(supportsVideoCapture)) {
throw new MediaException("supports.video.capture is false");
}
String bestEncoding = null;
String videoSnapshotEncodings = System.getProperty("video.snapshot.encodings");
if (videoSnapshotEncodings != null) {
// We know explicitly what the camera supports; see if PNG is among them since
// Image.createImage() should always support it
int pngEncodingStart = videoSnapshotEncodings.indexOf("encoding=png");
if (pngEncodingStart >= 0) {
int space = videoSnapshotEncodings.indexOf(' ', pngEncodingStart);
bestEncoding = space >= 0 ?
videoSnapshotEncodings.substring(pngEncodingStart, space) :
videoSnapshotEncodings.substring(pngEncodingStart);
}
}
VideoControl videoControl = zXingMIDlet.getVideoControl(); VideoControl videoControl = zXingMIDlet.getVideoControl();
byte[] snapshot = null; byte[] snapshot = null;
try { try {
snapshot = videoControl.getSnapshot(bestEncoding); snapshot = videoControl.getSnapshot("".equals(bestEncoding) ? null : bestEncoding);
} catch (MediaException me) { } catch (MediaException me) {
} }
if (snapshot == null) { if (snapshot == null) {
@ -129,4 +112,29 @@ final class SnapshotThread implements Runnable {
return snapshot; return snapshot;
} }
private synchronized String guessBestEncoding() throws MediaException {
if (bestEncoding == null) {
// Check this property, present on some Nokias?
String supportsVideoCapture = System.getProperty("supports.video.capture");
if ("false".equals(supportsVideoCapture)) {
throw new MediaException("supports.video.capture is false");
}
bestEncoding = "";
String videoSnapshotEncodings = System.getProperty("video.snapshot.encodings");
if (videoSnapshotEncodings != null) {
// We know explicitly what the camera supports; see if PNG is among them since
// Image.createImage() should always support it
int pngEncodingStart = videoSnapshotEncodings.indexOf("encoding=png");
if (pngEncodingStart >= 0) {
int space = videoSnapshotEncodings.indexOf(' ', pngEncodingStart);
bestEncoding = space >= 0 ?
videoSnapshotEncodings.substring(pngEncodingStart, space) :
videoSnapshotEncodings.substring(pngEncodingStart);
}
}
}
return bestEncoding;
}
} }