/*
* @(#)NativeDecoder.java 1.8 02/08/21
*
* Copyright (c) 1996-2002 Sun Microsystems, Inc. All rights reserved.
*/
package com.ibm.media.codec.audio.mpega;
import java.io.*;
import java.util.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.format.*;
import com.sun.media.*;
/** GSM to PCM java decoder
* @author Shay Ben-David bendavid@haifa.vnet.ibm.com
**/
public class NativeDecoder extends com.ibm.media.codec.audio.AudioCodec {
////////////////////////////////////////////////////////////////////////////
// Variables
/** <FONT COLOR="#FF0000">
* Licensed Materials - Property of IBM <br><br>
* "Restricted Materials of IBM" <br><br>
* 5746-SM2 <br><br>
* (c) Copyright IBM Corporation 1997,1998 All Rights Reserved <br><br>
* US Government Users Restricted Rights - Use, duplication or
* disclosure restricted by GSA ADP Schedule Contract with
* IBM Corporation.</FONT>
*
**/
public static final String a_copyright_notice="(c) Copyright IBM Corporation 1997,1998.";
/* native functions prototype */
private static native int mpeg_initialization (long[] pdata, int mpeg_quality);
private static native int mpeg_audio_decode (long pdata,
byte[] in_buf_byte, int in_buf_offset, int in_buf_len,
byte[] out_buf_byte, int out_buf_offset, int out_buf_len,
int one_frame_flag, int[] num_samples_done,
int[]in_bytes_read, int[] samp_freq, int[] stereo);
private static native int mpeg_terminate (long pdata);
/* define MPEG constants */
// maximum frame size is at layer 2, bitrate 384, sampling freq 32 KHz
static final int MAX_MPEG_STREAM_FRAME_SIZE = 1728;
static final int MAX_PCM_FRAME_SIZE = 2304; // stereo in Layer II
static final int INTERNAL_BUFFER_LEN = 50 * MAX_MPEG_STREAM_FRAME_SIZE; // 50 is arbitray, > 1 second
/* define decoding mode: one/many frames per call */
static final int DECODE_ONE_FRAME_ONLY = 0;
static final int DECODE_MANY_FRAMES = 1;
/* controling the audio quality (valid only for 44.1 KHz sampling rate */
static final int MPEG_CD_QUALITY = 0;
static final int MPEG_HIGH_QUALITY = 1;
static final int MPEG_MEDIUM_QUALITY = 2;
/* Return codes and error codes (do not change these values) */
static final int MPEG_NOERROR = 0;
static final int MPEG_ERROR = 1;
/* variables */
private int mpegAudioQuality = MPEG_CD_QUALITY; // default: CD
private int one_frame_flag = DECODE_MANY_FRAMES; // default: all the frames
// pointer to the MPEG decoder inner data structure
private long[] pdata = new long[1];
private int[] samp_freq = new int[1];
private int[] stereo = new int[1];
private int[] in_bytes_read = new int[1];
private int[] num_samples_done = new int[1];
private byte[] internalBuffer = new byte[INTERNAL_BUFFER_LEN+20]; // +10 is enough, to prevent over-read inside the dll
private int internalBufferDataLen = 0;
////////////////////////////////////////////////////////////////////////////
// Methods
public NativeDecoder() {
supportedInputFormats = new AudioFormat[] { new AudioFormat(AudioFormat.MPEG) };
defaultOutputFormats = new AudioFormat[] { new AudioFormat(AudioFormat.LINEAR) };
PLUGIN_NAME="MPEG Decoder";
}
protected Format[] getMatchingOutputFormats(Format in) {
AudioFormat af =(AudioFormat) in;
supportedOutputFormats = new AudioFormat[] {
new AudioFormat(
AudioFormat.LINEAR,
af.getSampleRate(),
16,
af.getChannels(),
AudioFormat.LITTLE_ENDIAN, //isBigEndian(),
AudioFormat.SIGNED //isSigned());
) };
return supportedOutputFormats;
}
public void open() throws ResourceUnavailableException{
try {
JMFSecurityManager.loadLibrary("jmutil");
JMFSecurityManager.loadLibrary("jmmpega");
internalBufferDataLen = 0;
mpeg_initialization(pdata,mpegAudioQuality);
return;
} catch (Throwable t) {
System.out.println("Unable to load "+PLUGIN_NAME+"\n"+t);
}
throw new ResourceUnavailableException("Unable to load "+PLUGIN_NAME);
}
public void reset() {
close();
try {
open();
} catch (Exception e) {
}
}
public void close() {
mpeg_terminate (pdata[0]);
}
public int process(Buffer inputBuffer, Buffer outputBuffer) {
if (!checkInputBuffer(inputBuffer) ) {
return BUFFER_PROCESSED_FAILED;
}
if (isEOM(inputBuffer) ) {
propagateEOM(outputBuffer);
return BUFFER_PROCESSED_OK;
}
int inpLength=inputBuffer.getLength();
int outLength=44100*40; /* default output is 1 second of 44.1Khz stereo */ // *40 is arbitray
int rc, returnResult = 0;
byte[] inpData = (byte[]) inputBuffer.getData();
byte[] outData = validateByteArraySize(outputBuffer, outLength);
/* fill input data */
if (INTERNAL_BUFFER_LEN - internalBufferDataLen > inpLength) {
System.arraycopy(inpData, inputBuffer.getOffset(),
internalBuffer, internalBufferDataLen, inpLength);
internalBufferDataLen += inpLength;
} else {
returnResult |= INPUT_BUFFER_NOT_CONSUMED;
}
/* decode */
rc = mpeg_audio_decode (pdata[0],
internalBuffer, 0, internalBufferDataLen ,
outData, 0, outData.length,
one_frame_flag, num_samples_done,
in_bytes_read, samp_freq, stereo);
if (rc != MPEG_NOERROR) {
// System.out.println("MPEG Audio decoder error");
return (returnResult | BUFFER_PROCESSED_FAILED);
}
/* if read too much, due to incomplete frame, do not crash */
if (in_bytes_read[0] > internalBufferDataLen) {
//if (in_bytes_read[0]-10 > internalBufferDataLen) { // few bytes can be over-read in the dll in end-of-stream...
// System.out.println("PROBLEM in Mpeg Audio Decoder: too many bytes have been decoded");
//}
in_bytes_read[0] = internalBufferDataLen;
}
/* meanwhile, always shift data to buf start (not so efficient...) */
System.arraycopy(internalBuffer, in_bytes_read[0],
internalBuffer, 0,
internalBufferDataLen - in_bytes_read[0]);
/* update */
internalBufferDataLen -= in_bytes_read[0];
outLength = num_samples_done[0] << 1; // number of bytes
if (outLength > 0) {
updateOutput(outputBuffer, outputFormat, outLength, 0);
} else {
returnResult |= OUTPUT_BUFFER_NOT_FILLED;
}
return (returnResult | BUFFER_PROCESSED_OK);
}
}
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