Salut,
Je développe une petite application qui doit lire la webcam de mon ordinateur pour prendre des photos et les enregistrer dans le disque. J’ai pris un code sur le net, j’ai installé toutes les librairies nécessaires mais je n’arrive toujours pas à ma fin.
Voici le code que j’ai utilisé, sachant que j’utilise l’API JMF pour lire à partir de ma webcam :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
 
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
 
import javax.media.Buffer;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.VideoFormat;
import javax.media.util.BufferToImage;
import javax.swing.JButton;
import javax.swing.JComponent;
 
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
 
public class WebcamCapture extends Panel implements ActionListener {
 
    public static Player player = null;
    public CaptureDeviceInfo di = null;
    public MediaLocator ml = null;
    public JButton capture = null;
    public Buffer buf = null;
    public Image img = null;
    public VideoFormat vf = null;
    public BufferToImage btoi = null;
    public ImagePanel imgpanel = null;
 
    public WebcamCapture() {
        setLayout(new BorderLayout());
        setSize(320, 550);
 
        imgpanel = new ImagePanel();
        capture = new JButton("Capture");
        capture.addActionListener(this);
 
        String str1 = "vfw:Logitech USB Video Camera:0";
        String str2 = "vfw:Microsoft WDM Image Capture (Win32):0";
        di = CaptureDeviceManager.getDevice(str2);
        ml = new MediaLocator("vfw://0");
 
        try {
            player = Manager.createRealizedPlayer(ml);
            player.start();
            Component comp;
 
            if ((comp = player.getVisualComponent()) != null) {
                add(comp, BorderLayout.NORTH);
            }
            add(capture, BorderLayout.CENTER);
            add(imgpanel, BorderLayout.SOUTH);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    public static void main(String[] args) {
        Frame f = new Frame("Webcam Capture");
        WebcamCapture cf = new WebcamCapture();
 
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                playerclose();
                System.exit(0);
            }});
 
        f.add("Center", cf);
        f.pack();
        f.setSize(new Dimension(320, 550));
        f.setVisible(true);
    }
 
    public static void playerclose() {
        player.close();
        player.deallocate();
    }
 
    public void actionPerformed(ActionEvent e) {
        JComponent c = (JComponent) e.getSource();
 
        if (c == capture) {
            // Grab a frame
            FrameGrabbingControl fgc = 
 
		(FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl");
            buf = fgc.grabFrame();
            // Convert it to an image
            btoi = new BufferToImage((VideoFormat) buf.getFormat());
            img = btoi.createImage(buf);
            // show the image
            imgpanel.setImage(img);
            // save image
            saveJPG(img, "c:\\test.jpg");
        }
    }
 
    class ImagePanel extends Panel {
 
        public Image myimg = null;
 
        public ImagePanel() {
            setLayout(null);
            setSize(320, 240);
        }
 
        public void setImage(Image img) {
            this.myimg = img;
            repaint();
        }
 
        public void paint(Graphics g) {
            if (myimg != null) {
                g.drawImage(myimg, 0, 0, this);
            }
        }
    }
 
    public static void saveJPG(Image img, String s) {
        BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null),
 
	 BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = bi.createGraphics();
        g2.drawImage(img, null, null);
 
        FileOutputStream out = null;
        try {
            out = new FileOutputStream(s);
        } catch (java.io.FileNotFoundException io) {
            io.printStackTrace();
            System.out.println("File Not Found");
        }
 
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
        param.setQuality(1.0f, false);
        encoder.setJPEGEncodeParam(param);
 
        try {
            encoder.encode(bi);
            out.close();
        } catch (java.io.IOException io) {
            io.printStackTrace();
            System.out.println("IOException");
        }
    }
}
Et voici le message d’erreur qui m’est balancé :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
3
4
5
6
7
8
9
 
java.io.IOException: Could not connect to capture device
java.io.IOException: Could not connect to capture device
javax.media.NoPlayerException: Error instantiating class: com.sun.media.protocol.vfw.DataSource : java.io.IOException: Could not connect to capture device
	at javax.media.Manager.createPlayerForContent(Manager.java:1362)
	at javax.media.Manager.createPlayer(Manager.java:417)
	at javax.media.Manager.createRealizedPlayer(Manager.java:553)
	at webcam.WebcamCapture.<init>(WebcamCapture.java:68)
	at webcam.WebcamCapture.main(WebcamCapture.java:84)
Votre aide me sera vraiment la bienvenue et utile…
Merci d'avance