com.ibm.media.codec.audio.AudioPacketizer Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of fmj Show documentation
Freedom for Media in Java
The newest version!
package com.ibm.media.codec.audio;

import javax.media.*;

/**
 * Implements an G723 Packetizer.
 */
public abstract class AudioPacketizer extends AudioCodec
{
    // //////////////////////////////////////////////////////////////////////////
    // Variables

    protected byte[] history;

    protected int packetSize;

    protected int historyLength;

    protected int sample_count;

    // protected long currentSeq = (long)
    // (System.currentTimeMillis() * Math.random() );

    // current timestamp on RTP format packets.
    // protected long timestamp = (long)
    // (System.currentTimeMillis() * Math.random() );

    // //////////////////////////////////////////////////////////////////////////
    // Methods
    public synchronized int process(Buffer inputBuffer, Buffer outputBuffer)
    {
        int inpLength = inputBuffer.getLength();
        int outLength = packetSize;

        byte[] inpData = (byte[]) inputBuffer.getData();
        byte[] outData = validateByteArraySize(outputBuffer, outLength);

        if (inpLength + historyLength >= packetSize)
        {
            int copyFromHistory = Math.min(historyLength, packetSize);

            System.arraycopy(history, 0, outData, 0, copyFromHistory);

            int remainingBytes = packetSize - copyFromHistory;
            System.arraycopy(inpData, inputBuffer.getOffset(), outData,
                    historyLength, remainingBytes);

            historyLength -= copyFromHistory;
            inputBuffer.setOffset(inputBuffer.getOffset() + remainingBytes);
            inputBuffer.setLength(inpLength - remainingBytes);

            // EP: packetizers will not convert time to RTP
            // units. This will be done in the RTP session manager and thus
            // processor will use the media times as is.
            // outputBuffer.setSequenceNumber(currentSeq++);
            // outputBuffer.setTimeStamp(timestamp);
            // timestamp+=sample_count;

            updateOutput(outputBuffer, outputFormat, outLength, 0);

            return INPUT_BUFFER_NOT_CONSUMED;
        }

        if (inputBuffer.isEOM())
        { // last packet

            System.arraycopy(history, 0, outData, 0, historyLength);
            System.arraycopy(inpData, inputBuffer.getOffset(), outData,
                    historyLength, inpLength);

            // EP: packetizers will not convert time to RTP
            // units. This will be done in the RTP session manager and thus
            // processor will use the media times as is.
            // outputBuffer.setSequenceNumber(currentSeq++);
            // outputBuffer.setTimeStamp(timestamp);
            // timestamp+=sample_count;

            updateOutput(outputBuffer, outputFormat, inpLength + historyLength,
                    0);

            historyLength = 0;

            return BUFFER_PROCESSED_OK;
        }

        // save remainder for next time
        System.arraycopy(inpData, inputBuffer.getOffset(), history,
                historyLength, inpLength);
        historyLength += inpLength;
        return OUTPUT_BUFFER_NOT_FILLED;
    }

    @Override
    public void reset()
    {
        historyLength = 0;
    }
}