MediaInfo.java

/*
 * Copyright 2007 Sun Microsystems, Inc.
 *
 * This file is part of jVoiceBridge.
 *
 * jVoiceBridge is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation and distributed hereunder
 * to you.
 *
 * jVoiceBridge 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, see <http://www.gnu.org/licenses/>.
 *
 * Sun designates this particular file as subject to the "Classpath"
 * exception as provided by Sun in the License file that accompanied this
 * code.
 */

package com.sun.voip;

import java.io.IOException;

import java.util.ArrayList;

public class MediaInfo {

    private byte payload;
    private int encoding;
    private int sampleRate;
    private int channels;

    private boolean isTelephoneEventPayload;

    private int samplesPerPacket;

    private static ArrayList supportedMedia = new ArrayList();

    static {
	supportedMedia.add(new MediaInfo(
            (byte)0, RtpPacket.PCMU_ENCODING, 8000, 1, true));

        //supportedMedia.add(new MediaInfo(
        //    (byte)101, RtpPacket.PCM_ENCODING, 8000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)102, RtpPacket.PCM_ENCODING, 8000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)103, RtpPacket.PCM_ENCODING, 16000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)104, RtpPacket.PCM_ENCODING, 16000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)105, RtpPacket.PCM_ENCODING, 32000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)106, RtpPacket.PCM_ENCODING, 32000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)107, RtpPacket.PCM_ENCODING, 44100, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)108, RtpPacket.PCM_ENCODING, 44100, 2, false));

if (false) {
        supportedMedia.add(new MediaInfo(
            (byte)109, RtpPacket.PCM_ENCODING, 48000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)110, RtpPacket.PCM_ENCODING, 48000, 2, false));
}

        supportedMedia.add(new MediaInfo(
            (byte)111, RtpPacket.PCM_ENCODING, 48000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)112, RtpPacket.PCMU_ENCODING, 16000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)113, RtpPacket.PCMU_ENCODING, 16000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)114, RtpPacket.PCMU_ENCODING, 32000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)115, RtpPacket.PCMU_ENCODING, 32000, 2, false));

if (false) {
        supportedMedia.add(new MediaInfo(
            (byte)116, RtpPacket.PCMU_ENCODING, 44100, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)117, RtpPacket.PCMU_ENCODING, 44100, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)118, RtpPacket.PCMU_ENCODING, 48000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)119, RtpPacket.PCMU_ENCODING, 48000, 2, false));
}

        supportedMedia.add(new MediaInfo(
            (byte)120, RtpPacket.SPEEX_ENCODING, 8000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)121, RtpPacket.SPEEX_ENCODING, 8000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)122, RtpPacket.SPEEX_ENCODING, 16000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)123, RtpPacket.SPEEX_ENCODING, 16000, 2, false));

        supportedMedia.add(new MediaInfo(
            (byte)124, RtpPacket.SPEEX_ENCODING, 32000, 1, false));

        supportedMedia.add(new MediaInfo(
            (byte)125, RtpPacket.SPEEX_ENCODING, 32000, 2, false));
    }

    public MediaInfo(byte payload , int encoding, int sampleRate, int channels, boolean isTelephoneEventPayload)
    {
		this.payload = payload;
		this.encoding = encoding;
		this.sampleRate = sampleRate;
		this.channels = channels;
		this.isTelephoneEventPayload = isTelephoneEventPayload;

		samplesPerPacket = sampleRate * channels / (1000 / RtpPacket.PACKET_PERIOD);
    }

    public static MediaInfo findMediaInfo(int encoding, int sampleRate,
	int channels) throws IOException {

	for (int i = 0; i < supportedMedia.size(); i++) {
	    MediaInfo mediaInfo = (MediaInfo) supportedMedia.get(i);

	    if (mediaInfo.getEncoding() == encoding &&
		    mediaInfo.getSampleRate() == sampleRate &&
		    mediaInfo.getChannels() == channels) {

		return mediaInfo;
	    }
	}

	throw new IOException("Unsupported media " + encoding
	    + "/" + sampleRate + "/" + channels);
    }

    public static MediaInfo findMediaInfo(byte payload) throws IOException {
	for (int i = 0; i < supportedMedia.size(); i++) {
	    MediaInfo mediaInfo = (MediaInfo) supportedMedia.get(i);

	    if (mediaInfo.getPayload() == payload) {
		return mediaInfo;
	    }
	}

	throw new IOException("Unsupported payload " + payload);
    }

    public byte getPayload() {
	return payload;
    }

    public int getEncoding() {
	return encoding;
    }

    public String getEncodingString() {
	if (encoding == RtpPacket.PCMU_ENCODING) {
	    return "PCMU";
	}

	if (encoding == RtpPacket.PCM_ENCODING) {
	    return "PCM";
	}

	return "SPEEX";
    }

    public int getSampleRate() {
	return sampleRate;
    }

    public int getChannels() {
	return channels;
    }

    public int getSamplesPerPacket() {
	return samplesPerPacket;
    }

    public boolean isTelephoneEventPayload() {
	return isTelephoneEventPayload;
    }

    public String toString() {
	String s = "PCMU";

	if (encoding == RtpPacket.PCM_ENCODING) {
	    s = "PCM";
	} else if (encoding == RtpPacket.SPEEX_ENCODING) {
	    s = "SPEEX";
	}

	return payload + ":" + s + "/" + sampleRate + "/" + channels;
    }

}