FileDocCategorySizeDatePackage
NativeEncoder.javaAPI DocJMF 2.1.1e14077Mon May 12 12:21:02 BST 2003com.ibm.media.codec.audio.mpegenc

NativeEncoder

public class NativeEncoder extends AudioCodec
Native Mpeg Encoder Java wrapper
author
Shay Ben-David bendavid@il.ibm.com

Fields Summary
public static final String
a_copyright_notice
Licensed Materials - Property of IBM

"Restricted Materials of IBM"

5746-SM2

(c) Copyright IBM Corporation 1997,1999 All Rights Reserved

US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corporation.
Control[]
controls
static final int
MAX_MPEG_STREAM_FRAME_SIZE
static final int
MAX_PCM_FRAME_SIZE
static final int
ENCD_MAX_FRAMES
static final int
MAX_INPUT_SIZE
static final int
MAX_OUTPUT_SIZE
static final int
MPEG_NOERROR
static final int
MPEG_ERROR
static final int
MPEG_FALSE
static final int
MPEG_TRUE
static final int
MPEG_STEREO
static final int
MPEG_JOINT_STEREO
static final int
MPEG_DUAL_CHANNEL
static final int
MPEG_SINGLE_CHANNEL
static final int[]
layer1BitRate_mono
static final int[]
layer1BitRate_stereo
static final int[]
layer2BitRate_mono
static final int[]
layer2BitRate_stereo
private int[]
pdata
private int[]
psetup
private int
layer
private int
encodingType
private int
bitrate
private int
samplingFrequency
private int
endianess
private int
copyright
private int
original
private int
errorProtect
private int
nChannels
private int[]
in_bytes
private int[]
out_bytes
boolean
isStarted
byte[]
history
int
historyLength
Constructors Summary
public NativeEncoder()



    ////////////////////////////////////////////////////////////////////////////
    // Methods

      
        int[] SamplingFrequencies={32000, 44100,48000};

       	supportedInputFormats = new AudioFormat[3];

        for (int i=0;i<3;i++) {
            supportedInputFormats[i]=new AudioFormat(AudioFormat.LINEAR,
                                                SamplingFrequencies[i],
						16,
                                                Format.NOT_SPECIFIED,
						AudioFormat.LITTLE_ENDIAN,
						AudioFormat.SIGNED,
                                                Format.NOT_SPECIFIED,
                                                Format.NOT_SPECIFIED,
                                                byte[].class
                                );
        }

        defaultOutputFormats  = new AudioFormat[] { new AudioFormat(AudioFormat.MPEG) };
        PLUGIN_NAME="MPEG Audio Encoder";
Methods Summary
booleanSetEncodingType(int new_encodingType)

        encodingType=new_encodingType;
        reset();
        return true;
public voidclose()

        nativeClose (pdata, psetup);
public java.lang.Object[]getControls()

        if (controls==null) {
             controls=new Control[1];
             controls[0]=new MpegAudioControlAdapter(this, layer, samplingFrequency,
	                 nChannels, bitrate, 0,0,0,0);
	}


        return (Object[])controls;
protected javax.media.Format[]getMatchingOutputFormats(javax.media.Format in)


        AudioFormat af =(AudioFormat) in;

        supportedOutputFormats = new AudioFormat[] {
            new AudioFormat(AudioFormat.MPEG,
	                    af.getSampleRate(),
                            Format.NOT_SPECIFIED,
                            af.getChannels(),
                            Format.NOT_SPECIFIED,
                            Format.NOT_SPECIFIED,
                            Format.NOT_SPECIFIED,
                            Format.NOT_SPECIFIED,
                            byte[].class
			   )
        };
        return supportedOutputFormats;
booleanisControlValid()

        if ( (original != MPEG_FALSE ) &&
	     (original != MPEG_TRUE  )
	   )
            return false;

        if ( (errorProtect != MPEG_FALSE ) &&
	     (errorProtect != MPEG_TRUE  )
           )
            return false;

        if ( (copyright != MPEG_FALSE ) &&
	     (copyright != MPEG_TRUE  )
	   )
            return false;

        if ( (endianess != MPEG_FALSE ) &&
	     (endianess != MPEG_TRUE  )
	   )
            return false;

        if ( (samplingFrequency != 32000 ) &&
	     (samplingFrequency != 44100 ) &&
	     (samplingFrequency != 48000 )
           )
            return false;

        if ( (layer != 1 ) &&
	     (layer != 2 )
           )
            return false;

        if ( (nChannels != 1 ) &&
	     (nChannels != 2 )
           )
            return false;

        // no support for mpeg dual channel
        if ( (encodingType == MPEG_DUAL_CHANNEL ) )
            return false;


        if ( (encodingType == MPEG_SINGLE_CHANNEL ) &&
	     (nChannels != 1 )
           )
            return false;

        if ( ( (encodingType == MPEG_STEREO       ) ||
               (encodingType == MPEG_JOINT_STEREO ) ) &&
	     (nChannels != 2 )
           )
            return false;

        if (layer == 1) {
            if (nChannels == 1) {
                for (int i=0;i<layer1BitRate_mono.length;i++) {
                    if (bitrate==layer1BitRate_mono[i]) {
                        return true;
                    }
                }
                return false;
            }

            {
                for (int i=0;i<layer1BitRate_stereo.length;i++) {
                    if (bitrate==layer1BitRate_stereo[i]) {
                        return true;
                    }
                }
                return false;
            }
        }
        // layer 2
        if (nChannels == 1) {
            for (int i=0;i<layer2BitRate_mono.length;i++) {
                if (bitrate==layer2BitRate_mono[i]) {
                    return true;
                }
            }
            return false;
        }

        {
            for (int i=0;i<layer2BitRate_stereo.length;i++) {
                if (bitrate==layer2BitRate_stereo[i]) {
                    return true;
                }
            }
            return false;
        }
private static native intnativeClose(int[] pdata, int[] pestup)

private static native intnativeEncode(int[] pdata, int[] psetup, byte[] in_buf, int in_buf_offset, int in_buf_len, byte[] out_buf, int out_buf_offset, int out_buf_len, int[] in_bytes, int[] out_bytes)
private static native intnativeGetBytesToRead(int[] pdata, int[] psetup)
private static native intnativeHandleEOM(int[] pdata, int[] pestup, byte[] out_buf, int out_buf_offset, int[] out_bytes)
private static native intnativeInit(int[] pdata, int[] psetup, int layer, int encodingType, int bitrate, int samplingFrequency, int endianess, int copyright, int original, int errorProtect)
private static native intnativeOpen(int[] pdata, int[] psetup)
public voidopen()
        try {
	    JMFSecurityManager.loadLibrary("jmutil");
	    JMFSecurityManager.loadLibrary("jmmpegenc");
            nativeOpen(pdata, psetup);
            reset();
            openControlPanel();

            return;

	} catch (Throwable t) {
            String errMsg= "Unable to load "+PLUGIN_NAME+"\n"+t;
            t.printStackTrace();
            System.err.println(errMsg);
            throw new ResourceUnavailableException(errMsg);

	}
    
private voidopenControlPanel()
        java.awt.Frame controlFrame=new java.awt.Frame(getName()+"  Control");
        controlFrame.setLayout(new com.sun.media.controls.VFlowLayout(1));
        controlFrame.add(new Label(getName()+"  Control",Label.CENTER) );
        controlFrame.add(new Label( " "));

        Control[] c=(Control[]) getControls();
        for (int i=0;i<c.length;i++) {
            controlFrame.add(c[i].getControlComponent() );
        }
        controlFrame.pack();
        controlFrame.show();
    
public intprocess(javax.media.Buffer inputBuffer, javax.media.Buffer outputBuffer)
     isStarted=true;

     int inpLength=inputBuffer.getLength();
     int outLength;
     int rc, returnResult = 0;
     boolean fullFrame=true;

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

     int inOffset=inputBuffer.getOffset();
     int outOffset=outputBuffer.getOffset();

     int neededinput=nativeGetBytesToRead(pdata,psetup);

     int inpBytes =  neededinput -  historyLength;

     if (inpBytes>inpLength) {
         inpBytes=inpLength;
         fullFrame=false;
     }

     System.arraycopy(inpData,inOffset,history,historyLength, inpBytes);

     historyLength += inpBytes;
     inOffset  += inpBytes;
     inpLength -= inpBytes;
     inputBuffer.setOffset(inOffset  );
     inputBuffer.setLength(inpLength );

     if (!fullFrame) {
         if (inputBuffer.isEOM() ) {
             nativeHandleEOM (pdata, psetup,outData,outOffset,out_bytes);
             outLength=out_bytes[0];
             updateOutput(outputBuffer, outputFormat, outLength, 0);
             return BUFFER_PROCESSED_OK;
         }

         return OUTPUT_BUFFER_NOT_FILLED;

     }

     rc = nativeEncode (pdata, psetup,
                        history,0,neededinput,
                        outData, outOffset, outData.length,
                        in_bytes, out_bytes);

     historyLength=0;

     if (rc != MPEG_NOERROR) {
         System.out.println("MPEG Audio process error "+rc);
         return (BUFFER_PROCESSED_FAILED);
     }

     outLength=out_bytes[0];
     int readInput=in_bytes[0];

     updateOutput(outputBuffer, outputFormat, outLength, 0);

     return ( INPUT_BUFFER_NOT_CONSUMED | BUFFER_PROCESSED_OK);

public voidreset()

        int rc = nativeInit  ( pdata, psetup,
                     layer, encodingType, bitrate, samplingFrequency,
                     endianess, copyright, original, errorProtect
        );

        if (rc!=MPEG_NOERROR) {
            throw new RuntimeException("MPEG encoder setting failed. rc="+rc);
        }

        historyLength=0;
        isStarted=false;

    
booleansetBitrate(int new_bitrate)
        bitrate=new_bitrate;
        reset();
        return true;
    
booleansetCopyright(int new_copyRight)
        copyright=new_copyRight;
        reset();
        return true;
    
booleansetErrorProtect(int new_errorProtect)
        errorProtect=new_errorProtect;
        reset();
        return true;
    
public javax.media.FormatsetInputFormat(javax.media.Format format)
         AudioFormat af=(AudioFormat)super.setInputFormat(format);
         if (af==null) {
             return null;
         }
         nChannels=af.getChannels();
         samplingFrequency=(int)af.getSampleRate();
         endianess= (af.getEndian() == AudioFormat.BIG_ENDIAN) ? MPEG_TRUE : MPEG_FALSE;
         bitrate=128 * nChannels;
         layer=2;
         encodingType= (nChannels==1) ? MPEG_SINGLE_CHANNEL : MPEG_STEREO;
         copyright=MPEG_FALSE;
         original=MPEG_FALSE;
         errorProtect=MPEG_FALSE;

         return (Format)af;
    
booleansetLayer(int new_layer)
        layer=new_layer;
        reset();
        return true;
    
booleansetOriginal(int new_original)
        original=new_original;
        reset();
        return true;