Question regardig JMF

[René Beltman]

Hello everyone,

With the JMF I am trying to locally save an image provided by a webcam.

For this I need the BufferToImage class. This class requires a Buffer
object, but how do I configure this buffer object or how can I get an
already configured buffer?

The following code is not creating an image:
import javax.media.*;
import javax.media.format.*;
import javax.media.protocol.*;
import javax.media.util.BufferToImage;

public class Webcam {
public static void main(String [] args) throws Throwable {

// get the webcam
CaptureDeviceInfo info = CaptureDeviceManager.getDevice("vfw:Microsoft WDM
Image Capture (Win32):0");

DataSource src = Manager.createDataSource(info.getLocator());

src.connect();
src.start();

if (src instanceof PullBufferDataSource) {

PullBufferDataSource dataSource = (PullBufferDataSource) src;

PullBufferStream [] dataStreams = dataSource.getStreams();

System.out.println("PullBufferStream:");
for (int i = 0; i < dataStreams.length; i++) {
System.out.println(i + ": " + dataStreams);
}

} else if (src instanceof PullDataSource) {

PullDataSource dataSource = (PullDataSource) src;

PullSourceStream [] dataStreams = dataSource.getStreams();

System.out.println("PullDataSource:");
for (int i = 0; i < dataStreams.length; i++) {
System.out.println(i + ": " + dataStreams);
}

} else if (src instanceof PushBufferDataSource) {

PushBufferDataSource dataSource = (PushBufferDataSource) src;

PushBufferStream [] dataStreams = dataSource.getStreams();

System.out.println("PushBufferDataSource:");
for (int i = 0; i < dataStreams.length; i++) {
System.out.println(i + ": " + dataStreams);
}

System.out.println("preparing a capture...");

PushBufferStream dataStream = dataStreams[0];

System.out.println("created a dataStream, now creating a buffer...");

Buffer buffer = new Buffer();

System.out.println("created a buffer, now configuring...");

buffer.setDuration(1000000);

System.out.println("buffer configured. Now starting to read...");

dataStream.read(buffer);

System.out.println("reading finished, now detecting a format...");

Format [] formats = info.getFormats();

VideoFormat format = null;
for (int i = 0; i < formats.length && format == null; i++) {
format = formats instanceof VideoFormat ? (VideoFormat) formats :
null;
}

System.out.println("format " + format + " detected, now starting to
create an BufferToImage instance");

BufferToImage bti = new BufferToImage(format);

System.out.println("Instance ready, now creating an image");

java.awt.Image image = bti.createImage(buffer);

if (image != null) {
System.out.println("Image created");
} else {
System.out.println("The image could not been created");
}

} else if (src instanceof PushDataSource) {

PushDataSource dataSource = (PushDataSource) src;

PushSourceStream [] dataStreams = dataSource.getStreams();

System.out.println("PushDataSource:");
for (int i = 0; i < dataStreams.length; i++) {
System.out.println(i + ": " + dataStreams);
}

} else {
System.out.println(src.getClass().getName());
}
}
}

Does someone know wat I am doing wrong and how can I correct it? Thanks in
advantage.

Greetings,

René Beltman.

 

[JScoobyCed]

Hello everyone,

With the JMF I am trying to locally save an image provided by a webcam.

For this I need the BufferToImage class. This class requires a Buffer
object, but how do I configure this buffer object or how can I get an
already configured buffer?
[...]
Buffer buffer = new Buffer();

System.out.println("created a buffer, now configuring...");

buffer.setDuration(1000000);

System.out.println("buffer configured. Now starting to read...");

dataStream.read(buffer);

System.out.println("reading finished, now detecting a format...");

Format [] formats = info.getFormats();

VideoFormat format = null;
for (int i = 0; i < formats.length && format == null; i++) {
format = formats instanceof VideoFormat ? (VideoFormat) formats :
null;
}

System.out.println("format " + format + " detected, now starting to
create an BufferToImage instance");

BufferToImage bti = new BufferToImage(format);

Why are you trying to create a format out of the box. The Buffer object
can give it to you. I am not sure it will solve your issue, but I think
it worths trying:

<code>
VideoFormat format = (VideoFormat) buffer.getFormat();
BufferToImage bti = new BufferToImage(format);
Image image = bti.createImage(buffer);
</code>