AdvancedMultimediaManager.java

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.codename1.impl.blackberry.codescan;

/*
 * Copyright 2007 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
import javax.microedition.amms.control.camera.ExposureControl;
import javax.microedition.amms.control.camera.FocusControl;
import javax.microedition.amms.control.camera.ZoomControl;
import javax.microedition.amms.control.camera.FlashControl;
import javax.microedition.media.Controllable;
import javax.microedition.media.MediaException;
import javax.microedition.media.Control;

/**
 * <p>Implementation suitable for JSR-234 phones which takes advantage of
 * advanced camera capability.</p>
 *
 * @author Sean Owen
 */
public final class AdvancedMultimediaManager extends MultimediaManager {

    private static final int NO_ZOOM = 100;
    private static final int MAX_ZOOM = 200;
    private static final long FOCUS_TIME_MS = 750L;
    private static final String DESIRED_METERING = "center-weighted";
    private static final int DESIRED_FLASH = FlashControl.AUTO;

    public void setFocus(Controllable player) {

        FocusControl focusControl =
                (FocusControl) getControl(player, "javax.microedition.amms.control.camera.FocusControl");
        if (focusControl != null) {
            try {
                if (focusControl.isMacroSupported() && !focusControl.getMacro()) {
                    focusControl.setMacro(true);
                }
                if (focusControl.isAutoFocusSupported()) {
                    focusControl.setFocus(FocusControl.AUTO);
                    try {
                        Thread.sleep(FOCUS_TIME_MS); // let it focus...
                    } catch (InterruptedException ie) {
                        // continue
                    }
                    focusControl.setFocus(FocusControl.AUTO_LOCK);
                }
            } catch (MediaException me) {
                // continue
            }
        }
    }

    public void setZoom(Controllable player) {

        ZoomControl zoomControl = (ZoomControl) getControl(player, "javax.microedition.amms.control.camera.ZoomControl");
        if (zoomControl != null) {
            // We zoom in if possible to encourage the viewer to take a snapshot from a greater distance.
            // This is a crude way of dealing with the fact that many phone cameras will not focus at a
            // very close range.
            int maxZoom = zoomControl.getMaxOpticalZoom();
            if (maxZoom > NO_ZOOM) {
                zoomControl.setOpticalZoom(maxZoom > MAX_ZOOM ? MAX_ZOOM : maxZoom);
            } else {
                int maxDigitalZoom = zoomControl.getMaxDigitalZoom();
                if (maxDigitalZoom > NO_ZOOM) {
                    zoomControl.setDigitalZoom(maxDigitalZoom > MAX_ZOOM ? MAX_ZOOM : maxDigitalZoom);
                }
            }
        }
    }

    public void setExposure(Controllable player) {

        ExposureControl exposureControl =
                (ExposureControl) getControl(player, "javax.microedition.amms.control.camera.ExposureControl");
        if (exposureControl != null) {

            int[] supportedISOs = exposureControl.getSupportedISOs();
            if (supportedISOs != null && supportedISOs.length > 0) {
                int maxISO = Integer.MIN_VALUE;
                for (int i = 0; i < supportedISOs.length; i++) {
                    if (supportedISOs[i] > maxISO) {
                        maxISO = supportedISOs[i];
                    }
                }
                try {
                    exposureControl.setISO(maxISO);
                } catch (MediaException me) {
                    // continue
                }
            }

            String[] supportedMeterings = exposureControl.getSupportedLightMeterings();
            if (supportedMeterings != null) {
                for (int i = 0; i < supportedMeterings.length; i++) {
                    if (DESIRED_METERING.equals(supportedMeterings[i])) {
                        exposureControl.setLightMetering(DESIRED_METERING);
                        break;
                    }
                }
            }

        }
    }

    public void setFlash(Controllable player) {
        FlashControl flashControl =
                (FlashControl) getControl(player, "javax.microedition.amms.control.camera.FlashControl");
        if (flashControl != null) {
            int[] supportedFlash = flashControl.getSupportedModes();
            if (supportedFlash != null && supportedFlash.length > 0) {
                for (int i = 0; i < supportedFlash.length; i++) {
                    if (supportedFlash[i] == DESIRED_FLASH) {
                        try {
                            flashControl.setMode(DESIRED_FLASH);
                        } catch (IllegalArgumentException iae) {
                            // continue
                        }
                        break;
                    }
                }
            }
        }
    }

    private static Control getControl(Controllable player, String fullName) {
        Control control = player.getControl(fullName);
        if (control == null) {
            String shortName = fullName.substring(fullName.lastIndexOf('.') + 1);
            control = player.getControl(shortName);
        }
        return control;
    }
}