BandwidthManager.java

/*
BandwithManager.java
Copyright (C) 2010  Belledonne Communications, Grenoble, France

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
package org.linphone;

import org.linphone.core.LinphoneCallParams;
import org.linphone.core.LinphoneCore;
import org.linphone.core.Log;
import org.linphone.core.Version;
import org.linphone.core.VideoSize;
import org.linphone.core.video.AndroidCameraRecordManager;

import java.util.List;

public class BandwidthManager {

	public static final int HIGH_RESOLUTION = 0;
	public static final int LOW_RESOLUTION = 1;
	public static final int LOW_BANDWIDTH = 2;

	private static final int[][] bandwidthes = {{256,256}, {128,128}, {80,80}};
	private static BandwidthManager instance;
	
	private int currentProfile = HIGH_RESOLUTION;
	public int getCurrentProfile() {return currentProfile;}

	public static final synchronized BandwidthManager getInstance() {
		if (instance == null) instance = new BandwidthManager();
		return instance;
	}


	private BandwidthManager() {
		// FIXME register a listener on NetworkManager to get notified of network state
		// FIXME register a listener on Preference to get notified of change in video enable value
		
		// FIXME initially get those values
	}

	private boolean userRestriction;
	public boolean isUserRestriction() {return userRestriction;}
	public void setUserRestriction(boolean limit) {
		userRestriction = limit;
		computeNewProfile();
	}
	
	
	private void computeNewProfile() {
		int newProfile = userRestriction ? LOW_RESOLUTION : HIGH_RESOLUTION;
		if (newProfile != currentProfile) {
			currentProfile = newProfile;
			onProfileChanged(currentProfile);
		}
	}

	private void onProfileChanged(int newProfile) {
		LinphoneCore lc = LinphoneManager.getLc();
		lc.setUploadBandwidth(bandwidthes[newProfile][0]);
		lc.setDownloadBandwidth(bandwidthes[newProfile][1]);

		if (lc.isIncall()) {
			CallManager.getInstance().reinvite();
		} else {
			updateWithProfileSettings(lc, null);
		}
	}


	public void updateWithProfileSettings(LinphoneCore lc, LinphoneCallParams callParams) {
		// Setting Linphone Core Preferred Video Size
		boolean bandwidthOKForVideo = isVideoPossible();
		if (bandwidthOKForVideo && Version.isVideoCapable()) {
			AndroidCameraRecordManager acrm = AndroidCameraRecordManager.getInstance();
			boolean isPortrait=acrm.isFrameToBeShownPortrait();
			VideoSize targetVideoSize=maxSupportedVideoSize(isPortrait, getMaximumVideoSize(isPortrait),
					acrm.supportedVideoSizes());
			
			lc.setPreferredVideoSize(targetVideoSize);
			VideoSize actualVideoSize = lc.getPreferredVideoSize();
			if (!targetVideoSize.equals(actualVideoSize)) {
				lc.setPreferredVideoSize(VideoSize.createStandard(VideoSize.QCIF, targetVideoSize.isPortrait()));
			}
		}

		if (callParams != null) { // in call
			// Update video parm if
			if (!bandwidthOKForVideo) { // NO VIDEO
				callParams.setVideoEnabled(false);
				callParams.setAudioBandwidth(40);
			} else {
				callParams.setVideoEnabled(true);
				callParams.setAudioBandwidth(0); // disable limitation
			}
		}
	}


	private VideoSize maxSupportedVideoSize(boolean isPortrait, VideoSize maximumVideoSize,
			List<VideoSize> supportedVideoSizes) {
		Log.d("Searching for maximum video size for ", isPortrait ? "portrait" : "landscape","capture from (",maximumVideoSize);
		VideoSize selected = VideoSize.createStandard(VideoSize.QCIF, isPortrait);
		for (VideoSize s : supportedVideoSizes) {
			int sW = s.width;
			int sH = s.height;
			if (s.isPortrait() != isPortrait) {
				sW=s.height;
				sH=s.width;
			}
			if (sW >maximumVideoSize.width || sH>maximumVideoSize.height) continue;
			if (selected.width <sW && selected.height <sH) {
				selected=new VideoSize(sW, sH);
				Log.d("A better video size has been found: ",selected);
			}
		}
		return selected;
	}

	private VideoSize maximumVideoSize(int profile, boolean cameraIsPortrait) {
		switch (profile) {
		case LOW_RESOLUTION:
			return VideoSize.createStandard(VideoSize.QCIF, cameraIsPortrait);
		case HIGH_RESOLUTION:
			return VideoSize.createStandard(VideoSize.QVGA, cameraIsPortrait);
		default:
			throw new RuntimeException("profile not managed : " + profile);
		}
	}


	public boolean isVideoPossible() {
		return currentProfile != LOW_BANDWIDTH;
	}

	private VideoSize getMaximumVideoSize(boolean isPortrait) {
		return maximumVideoSize(currentProfile, isPortrait);
	}
}