/**
* Creates a stream and corresponding live view image. Don't forget to call {@link
* CanonUtils#release(edsdk.bindings.EdSdkLibrary.EdsBaseRef.ByReference...) release()} on the
* returned array when you are done using it or you will cause a memory leak!
*
* @param camera the camera to query
* @return EdsEvfImageRef.ByReference and EdsStreamRef.ByReference as indexes 0 and 1 respectively
*/
public static EdsBaseRef.ByReference[] getLiveViewImageReference(final EdsCameraRef camera) {
EdsError err = EdsError.EDS_ERR_OK;
final EdsStreamRef.ByReference streamRef = new EdsStreamRef.ByReference();
final EdsEvfImageRef.ByReference imageRef = new EdsEvfImageRef.ByReference();
// Create memory stream.
err =
CanonUtils.toEdsError(
CanonCamera.EDSDK.EdsCreateMemoryStream(new NativeLong(0), streamRef));
if (err != EdsError.EDS_ERR_OK) {
System.err.println(
"Failed to download live view image, memory stream could not be created (error "
+ err.value()
+ ": "
+ err.name()
+ " - "
+ err.description()
+ ")");
CanonUtils.release(imageRef, streamRef);
return null;
}
err =
CanonUtils.toEdsError(
CanonCamera.EDSDK.EdsCreateEvfImageRef(
new EdsStreamRef(streamRef.getPointer().getPointer(0)), imageRef));
if (err != EdsError.EDS_ERR_OK) {
System.err.println(
"Failed to download live view image, image ref could not be created (error "
+ err.value()
+ ": "
+ err.name()
+ " - "
+ err.description()
+ ")");
CanonUtils.release(imageRef, streamRef);
return null;
}
// Now try to follow the guidelines from
// http://tech.groups.yahoo.com/group/CanonSDK/message/1225
// instead of what the edsdk example has to offer!
// Download live view image data.
err = CanonUtils.toEdsError(CanonCamera.EDSDK.EdsDownloadEvfImage(camera, imageRef.getValue()));
if (err != EdsError.EDS_ERR_OK) {
/*
* System.err.println( "Failed to download live view image (error "
* +
* err.value() + ": " + err.name() + " - " +
* err.description() + ")" );
*/
CanonUtils.release(imageRef, streamRef);
return null;
}
return new EdsBaseRef.ByReference[] {imageRef, streamRef};
}
/**
* Downloads an image and saves it somewhere.
*
* @param directoryItem The item you want to download
* @param destination A path in the filesystem where you want to save the file. Can also be null
* or a directory. In case of null the temp directory will be used, in case of a directory the
* file name of the item will be used.
* @param appendFileExtension Adds the extension of the photo onto File to ensure that supplied
* File name extension matches the image being downloaded from the camera. This is especially
* important if the camera is set to RAW+JPEG where the order of the images is not consistent.
* @return Either null, or the location the file was ultimately saved to on success.
*/
public static File download(
final EdsDirectoryItemRef directoryItem,
File destination,
final boolean appendFileExtension) {
EdsError err = EdsError.EDS_ERR_OK;
final EdsStreamRef.ByReference stream = new EdsStreamRef.ByReference();
final EdsDirectoryItemInfo dirItemInfo = new EdsDirectoryItemInfo();
boolean success = false;
// final long timeStart = System.currentTimeMillis();
try {
err =
CanonUtils.toEdsError(
CanonCamera.EDSDK.EdsGetDirectoryItemInfo(directoryItem, dirItemInfo));
if (err == EdsError.EDS_ERR_OK) {
if (destination == null) {
destination = new File(System.getProperty("java.io.tmpdir"));
}
if (destination.isDirectory()) {
destination = new File(destination, Native.toString(dirItemInfo.szFileName));
} else if (appendFileExtension) {
final String sourceFileName = Native.toString(dirItemInfo.szFileName);
final int i = sourceFileName.lastIndexOf(".");
if (i > 0) {
final String extension = sourceFileName.substring(i);
if (!destination.getName().toLowerCase().endsWith(extension)) {
destination = new File(destination.getPath() + extension);
}
}
}
if (destination.getParentFile() != null) {
destination.getParentFile().mkdirs();
}
/*
* System.out.println( "Downloading image " +
* Native.toString( dirItemInfo.szFileName ) +
* " to " + destination.getCanonicalPath() );
*/
// TODO: see if using an EdsCreateMemoryStream would be faster and whether the image could
// be read directly without saving to file first - see:
// http://stackoverflow.com/questions/1083446/canon-edsdk-memorystream-image
err =
CanonUtils.toEdsError(
CanonCamera.EDSDK.EdsCreateFileStream(
Native.toByteArray(destination.getCanonicalPath()),
EdsFileCreateDisposition.kEdsFileCreateDisposition_CreateAlways.value(),
EdsAccess.kEdsAccess_ReadWrite.value(),
stream));
}
if (err == EdsError.EDS_ERR_OK) {
err =
CanonUtils.toEdsError(
CanonCamera.EDSDK.EdsDownload(directoryItem, dirItemInfo.size, stream.getValue()));
}
if (err == EdsError.EDS_ERR_OK) {
/*
* System.out.println( "Image downloaded in " +
* ( System.currentTimeMillis() - timeStart ) +
* " ms" );
*/
err = CanonUtils.toEdsError(CanonCamera.EDSDK.EdsDownloadComplete(directoryItem));
success = true;
}
if (stream != null) {
CanonCamera.EDSDK.EdsRelease(stream.getValue());
}
} catch (final Exception e) {
e.printStackTrace();
}
return success ? destination : null;
}
/**
* Download a live view image from the camera and convert it directly into a bufferd image.
*
* @param camera
* @return
*/
public static BufferedImage getLiveViewImage(final EdsCameraRef camera) {
EdsError err = EdsError.EDS_ERR_OK;
final EdsBaseRef.ByReference[] references = CanonUtils.getLiveViewImageReference(camera);
if (references != null) {
final EdsStreamRef.ByReference streamRef = (EdsStreamRef.ByReference) references[1];
final EdsEvfImageRef.ByReference imageRef = (EdsEvfImageRef.ByReference) references[0];
// // Get the incidental data of the image.
// NativeLongByReference zoom = new NativeLongByReference( new NativeLong( 0 ) );
// Pointer data = zoom.getPointer();
// err = getPropertyData( image.getValue(), EdSdkLibrary.kEdsPropID_Evf_ZoomPosition, 0,
// NativeLong.SIZE, data );
// if( err != EdsError.EDS_ERR_OK ){
// System.err.println( "Failed to download live view image, zoom value wasn't read (error "+
// err.value() + ": "+ err.name() + " - " + err.description() + ")" );
// return null;
// }
//
// // Get the focus and zoom border position
// EdsPoint point = new EdsPoint();
// data = point.getPointer();
// err = getPropertyData( image.getValue(), EdSdkLibrary.kEdsPropID_Evf_ZoomPosition, 0 ,
// sizeof( point ), data );
// if( err != EdsError.EDS_ERR_OK ){
// System.err.println( "Failed to download live view image, focus point wasn't read (error
// "+ err.value() + ": "+ err.name() + " - " + err.description() + ")" );
// return null;
// }
final NativeLongByReference length = new NativeLongByReference();
err = CanonUtils.toEdsError(CanonCamera.EDSDK.EdsGetLength(streamRef.getValue(), length));
if (err != EdsError.EDS_ERR_OK) {
System.err.println(
"Failed to download live view image, failed to read stream length (error "
+ err.value()
+ ": "
+ err.name()
+ " - "
+ err.description()
+ ")");
CanonUtils.release(imageRef, streamRef);
return null;
}
final PointerByReference ref = new PointerByReference();
err = CanonUtils.toEdsError(CanonCamera.EDSDK.EdsGetPointer(streamRef.getValue(), ref));
if (err != EdsError.EDS_ERR_OK) {
System.err.println(
"Failed to download live view image, failed to get reference to image in memory (error "
+ err.value()
+ ": "
+ err.name()
+ " - "
+ err.description()
+ ")");
CanonUtils.release(imageRef, streamRef);
return null;
}
final byte[] data = ref.getValue().getByteArray(0, length.getValue().intValue());
try {
final BufferedImage img = ImageIO.read(new ByteArrayInputStream(data));
return img;
} catch (final IOException e) {
e.printStackTrace();
} finally {
CanonUtils.release(imageRef, streamRef);
}
}
return null;
}
