package org.asteriskjava.iax.audio.javasound;
import org.asteriskjava.iax.protocol.Log;
import org.asteriskjava.iax.protocol.VoiceFrame;
import org.asteriskjava.iax.util.ByteBuffer;
import javax.sound.sampled.AudioFormat;
public class AudioUlaw
extends AbstractAudio {
AudioFormat _ulawFormat;
private int _ss;
private static final boolean ZEROTRAP = true;
private static final short BIAS = 0x84;
private static final int CLIP = 32635;
private static final int exp_lut1[] = {
0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
};
AudioUlaw(Audio8k a8) {
_a8 = a8;
_ss = _a8.getSampSz();
Log.debug("8k buffer size = " + _ss);
_obuff = new byte[_ss];
_ibuff = new byte[_ss];
}
/**
* Converts a linear signed 16bit sample to a uLaw byte.
* Ported to Java by fb.
* <br>Originally by:<br>
* Craig Reese: IDA/Supercomputing Research Center <br>
* Joe Campbell: Department of Defense <br>
* 29 September 1989 <br>
*/
public static byte linear2ulaw(int sample) {
int sign, exponent, mantissa, ulawbyte;
if (sample > 32767) {
sample = 32767;
} else if (sample < -32768) {
sample = -32768;
/* Get the sample into sign-magnitude. */
}
sign = (sample >> 8) & 0x80; /* set aside the sign */
if (sign != 0) {
sample = -sample; /* get magnitude */
}
if (sample > CLIP) {
sample = CLIP; /* clip the magnitude */
/* Convert from 16 bit linear to ulaw. */
}
sample = sample + BIAS;
exponent = exp_lut1[(sample >> 7) & 0xFF];
mantissa = (sample >> (exponent + 3)) & 0x0F;
ulawbyte = ~(sign | (exponent << 4) | mantissa);
if (ZEROTRAP) {
if (ulawbyte == 0) {
ulawbyte = 0x02; /* optional CCITT trap */
}
}
return ((byte) ulawbyte);
}
/* u-law to linear conversion table */
private static short[] u2l = {
-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, 0,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
public static short ulaw2linear(byte ulawbyte) {
return u2l[ulawbyte & 0xFF];
}
protected AudioFormat getAudioFormat() {
if (_ulawFormat == null) {
try {
_ulawFormat = new AudioFormat(
AudioFormat.Encoding.ULAW,
8000.0F, // sampleRate
8, // sampleSizeInBits
1, // channels
1, // frameSize
8000.0F, // frameRate
false); // bigEndian
} catch (Exception x) {
Log.warn(x.getMessage());
}
}
return _ulawFormat;
}
/**
* changedProps
*/
@Override
public void changedProps() {
}
/**
* getSampSz
*
* @return int
*/
@Override
public int getSampSz() {
return 160;
}
@Override
public void convertToLin(byte[] in, byte[] out) {
convert(in, out);
}
@Override
public void convertFromLin(byte[] in, byte[] out) {
ByteBuffer bb = ByteBuffer.wrap(in);
for (int i = 0; i < out.length; i++) {
short s = bb.getShort();
out[i] = linear2ulaw(s);
}
}
/**
* convert
*
* @param in byte[]
* @param out byte[]
*/
public static void convert(byte[] in, byte[] out) {
ByteBuffer bb = ByteBuffer.wrap(out);
for (int i = 0; i < in.length; i++) {
short s = ulaw2linear(in[i]);
bb.putShort(s);
}
}
/**
* getFormatBit
*
* @return int
*/
@Override
public int getFormatBit() {
return VoiceFrame.ULAW_BIT;
}
}