/*
* 21.04.2004 Original verion. davagin@udm.ru.
* ----------------------------------------------------------------------- This
* program is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version. This program 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, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
* ----------------------------------------------------------------------
*/
package call.jeq;
import java.io.IOException;
import java.io.InputStream;
/**
* The EqualizerInputStream class Author: Dmitry Vaguine Date: 02.05.2004 Time:
* 12:00:29
*/
public class EqualizerInputStream extends InputStream {
private InputStream stream;
private IIR iir;
private final static int BUFFER_SIZE = 65536;
private byte[] inbuf = new byte[BUFFER_SIZE];
private int[] workbuf = new int[BUFFER_SIZE];
private byte[] outbuf = new byte[BUFFER_SIZE];
private int inpos = 0;
private int inlen = 0;
private int outpos = 0;
private int outlen = 0;
private boolean signed;
private int samplesize;
private boolean bigendian;
/**
* Constructs new EqualizerInputStream object
*
* @param stream
* is an input stream for pcm data
* @param samplerate
* is a sample rate of input data
* @param channels
* is the number of channels
* @param signed
* indicates that the data is signed
* @param samplesize
* is the sample bit size of data
* @param bigendian
* indicates that the dat is in "big endian" encoding
* @param bands
* is the number of bands
*/
public EqualizerInputStream(InputStream stream, float samplerate, int channels, boolean signed,
int samplesize, boolean bigendian, int bands) {
this.stream = stream;
this.iir = new IIR(bands, samplerate, channels);
this.signed = signed;
this.samplesize = samplesize;
this.bigendian = bigendian;
if (!isParamsSupported(samplerate, channels, samplesize, bands))
throw new IllegalArgumentException("Unsupported sample bit size");
}
/**
* Returns Controls of equalizer
*
* @return Controls of equalizer
*/
public IIRControls getControls() {
return iir.getControls();
}
/**
* This is special method for checking of supported parameters of equalizer
*
* @param bands
* is the number of bands
* @param samplerate
* is the sample rate of data
* @param channels
* is the number of channels
* @param samplesize
* is the size of sample in bits
* @return true if parameters are supported
*/
public static boolean isParamsSupported(float samplerate, int channels, int samplesize, int bands) {
switch (samplesize) {
case 8:
case 16:
case 24:
break;
default:
return false;
}
return IIR.isParamsSupported(bands, samplerate, channels);
}
private boolean fillInBuffer() throws IOException {
if (inpos != 0 && inlen > 0)
System.arraycopy(inbuf, inpos, inbuf, 0, inlen);
inpos = 0;
int num;
boolean eof = false;
while (inlen != inbuf.length) {
num = stream.read(inbuf, inlen, inbuf.length - inlen);
if (num < 0) {
eof = true;
break;
}
inlen += num;
}
return eof;
}
private void fillOutBuffer() {
if (outpos != 0 && outlen > 0)
System.arraycopy(outbuf, outpos, outbuf, 0, outlen);
outpos = 0;
int len = outbuf.length - outlen;
len = inlen < len ? inlen : len;
len = convertToInt(len);
if (len > 0) {
iir.iir(workbuf, len);
len = convertToByte(outbuf, outlen, len);
outlen += len;
}
}
private int convertToInt(int length) {
int l = length;
int temp;
byte a1[];
switch (samplesize) {
case 8: {
if (length > 0) {
System.arraycopy(inbuf, 0, workbuf, 0, length);
inpos += length;
inlen -= length;
}
break;
}
case 16: {
l = length >> 1;
if (l > 0) {
if (bigendian)
for (int i = 0; i < l; i++) {
temp = (((a1 = inbuf)[inpos++] & 0xff) << 8) | (a1[inpos++] & 0xff);
workbuf[i] = signed && temp > 32767 ? temp - 65536 : temp;
}
else
for (int i = 0; i < l; i++) {
temp = ((a1 = inbuf)[inpos++] & 0xff) | ((a1[inpos++] & 0xff) << 8);
workbuf[i] = signed && temp > 32767 ? temp - 65536 : temp;
}
inlen -= inpos;
}
break;
}
case 24: {
l = length / 3;
if (l > 0) {
if (bigendian)
for (int i = 0; i < l; i++) {
temp = ((a1 = inbuf)[inpos++] & 0xff) | ((a1[inpos++] & 0xff) << 8)
| ((a1[inpos++] & 0xff) << 16);
workbuf[i] = signed && temp > 8388607 ? temp - 16777216 : temp;
}
else
for (int i = 0; i < l; i++) {
temp = (((a1 = inbuf)[inpos++] & 0xff) << 16) | ((a1[inpos++] & 0xff) << 8)
| (a1[inpos++] & 0xff);
workbuf[i] = signed && temp > 8388607 ? temp - 16777216 : temp;
}
inlen -= inpos;
}
break;
}
}
return l;
}
private int wrap8Bit(int data) {
if (data > 127)
data = 127;
else if (data < -128)
data = -128;
if (data < 0)
data += 256;
return data;
}
private int wrap16Bit(int data) {
if (data > 32767)
data = 32767;
else if (data < -32768)
data = -32768;
if (data < 0)
data += 65536;
return data;
}
private int wrap24Bit(int data) {
if (data > 8388607)
data = 8388607;
else if (data < -8388608)
data = -8388608;
if (data < 0)
data += 16777216;
return data;
}
private int convertToByte(byte[] b, int off, int length) {
int p = off;
int d;
switch (samplesize) {
case 8: {
for (int i = 0; i < length; i++)
b[p++] = (byte) (wrap8Bit(workbuf[i]) & 0xff);
break;
}
case 16: {
if (bigendian) {
for (int i = 0; i < length; i++) {
d = wrap16Bit(workbuf[i]);
b[p++] = (byte) ((d & 0xff00) >> 8);
b[p++] = (byte) (d & 0xff);
}
} else {
for (int i = 0; i < length; i++) {
d = wrap16Bit(workbuf[i]);
b[p++] = (byte) (d & 0xff);
b[p++] = (byte) ((d & 0xff00) >> 8);
}
}
break;
}
case 24: {
if (bigendian) {
for (int i = 0; i < length; i++) {
d = wrap24Bit(workbuf[i]);
b[p++] = (byte) (d & 0xff);
b[p++] = (byte) ((d & 0xff00) >> 8);
b[p++] = (byte) ((d & 0xff0000) >> 16);
}
} else {
for (int i = 0; i < length; i++) {
d = wrap24Bit(workbuf[i]);
b[p++] = (byte) ((d & 0xff0000) >> 16);
b[p++] = (byte) ((d & 0xff00) >> 8);
b[p++] = (byte) (d & 0xff);
}
}
break;
}
}
return p - off;
}
/**
* Returns the number of bytes that can be read (or skipped over) from this
* input stream without blocking by the next caller of a method for this
* input stream. The next caller might be the same thread or another thread.
*
* @return the number of bytes that can be read from this input stream
* without blocking.
* @throws IOException
* if an I/O error occurs.
*/
public int available() throws IOException {
return outlen;
}
/**
* Closes this input stream and releases any system resources associated
* with the stream.
*
* @throws IOException
* if an I/O error occurs.
*/
public void close() throws IOException {
stream.close();
}
/**
* <p>
* The <code>mark</code> method of <code>EqualizerInputStream</code> does
* nothing.
*
* @param readlimit
* the maximum limit of bytes that can be read before the mark
* position becomes invalid.
*/
public synchronized void mark(int readlimit) {}
/**
* Tests if this input stream supports the <code>mark</code> and
* <code>reset</code> methods. Whether or not <code>mark</code> and
* <code>reset</code> are supported is an invariant property of a particular
* input stream instance. The <code>markSupported</code> method of
* <code>EqualizerInputStream</code> returns <code>false</code>.
*
* @return false
*/
public boolean markSupported() {
return false;
}
/**
* Reads the next byte of data from the input stream. The value byte is
* returned as an <code>int</code> in the range <code>0</code> to
* <code>255</code>. If no byte is available because the end of the stream
* has been reached, the value <code>-1</code> is returned. This method
* blocks until input data is available, the end of the stream is detected,
* or an exception is thrown.
*
* @return the next byte of data, or <code>-1</code> if the end of the
* stream is reached.
* @throws IOException
* if an I/O error occurs.
*/
public int read() throws IOException {
if (outlen == 0) {
boolean eof = fillInBuffer();
fillOutBuffer();
if (outlen == 0 && eof)
return -1;
if (outlen == 0 && !eof)
throw new IOException("Impossible state");
}
int b = outbuf[outpos++];
outlen--;
return b;
}
/**
* Reads up to <code>len</code> bytes of data from the input stream into an
* array of bytes. An attempt is made to read as many as <code>len</code>
* bytes, but a smaller number may be read. The number of bytes actually
* read is returned as an integer.
* <p/>
* <p>
* This method blocks until input data is available, end of file is
* detected, or an exception is thrown.
* <p/>
* <p>
* If <code>b</code> is <code>null</code>, a
* <code>NullPointerException</code> is thrown.
* <p/>
* <p>
* If <code>off</code> is negative, or <code>len</code> is negative, or
* <code>off+len</code> is greater than the length of the array
* <code>b</code>, then an <code>IndexOutOfBoundsException</code> is thrown.
* <p/>
* <p>
* If <code>len</code> is zero, then no bytes are read and <code>0</code> is
* returned; otherwise, there is an attempt to read at least one byte. If no
* byte is available because the stream is at end of file, the value
* <code>-1</code> is returned; otherwise, at least one byte is read and
* stored into <code>b</code>.
* <p/>
* <p>
* The first byte read is stored into element <code>b[off]</code>, the next
* one into <code>b[off+1]</code>, and so on. The number of bytes read is,
* at most, equal to <code>len</code>. Let <i>k</i> be the number of bytes
* actually read; these bytes will be stored in elements <code>b[off]</code>
* through <code>b[off+</code><i>k</i><code>-1]</code>, leaving elements
* <code>b[off+</code><i>k</i><code>]</code> through
* <code>b[off+len-1]</code> unaffected.
* <p/>
* <p>
* In every case, elements <code>b[0]</code> through <code>b[off]</code> and
* elements <code>b[off+len]</code> through <code>b[b.length-1]</code> are
* unaffected.
* <p/>
* <p>
* If the first byte cannot be read for any reason other than end of file,
* then an <code>IOException</code> is thrown. In particular, an
* <code>IOException</code> is thrown if the input stream has been closed.
*
* @param b
* the buffer into which the data is read.
* @param off
* the start offset in array <code>b</code> at which the data is
* written.
* @param len
* the maximum number of bytes to read.
* @return the total number of bytes read into the buffer, or
* <code>-1</code> if there is no more data because the end of the
* stream has been reached.
* @throws IOException
* if an I/O error occurs.
* @throws NullPointerException
* if <code>b</code> is <code>null</code>.
*/
public int read(byte[] b, int off, int len) throws IOException {
if (outlen < len) {
boolean eof = fillInBuffer();
fillOutBuffer();
if (outlen == 0 && eof)
return -1;
if (outlen == 0 && !eof)
throw new IOException("Impossible state");
}
len = outlen < len ? outlen : len;
if (len > 0) {
System.arraycopy(outbuf, outpos, b, off, len);
outpos += len;
outlen -= len;
}
return len;
}
/**
* <p>
* The method <code>reset</code> for class <code>EqualizerInputStream</code>
* does nothing except throw an <code>IOException</code>.
*
* @throws IOException
* as an indication that the mark feature doesn't supported by
* EqualizerInputStream.
*/
public void reset() throws IOException {
throw new IOException("mark/reset not supported");
}
/**
* Skips over and discards <code>n</code> bytes of data from this input
* stream. The <code>skip</code> method may, for a variety of reasons, end
* up skipping over some smaller number of bytes, possibly <code>0</code>.
* This may result from any of a number of conditions; reaching end of file
* before <code>n</code> bytes have been skipped is only one possibility.
* The actual number of bytes skipped is returned. If <code>n</code> is
* negative, no bytes are skipped.
*
* @param n
* the number of bytes to be skipped.
* @return the actual number of bytes skipped.
* @throws IOException
* if an I/O error occurs.
*/
public long skip(long n) throws IOException {
int l;
if (n <= outlen) {
outpos += n;
outlen -= n;
return n;
}
n -= outlen;
l = outlen;
outlen = 0;
outpos = 0;
if (n <= inlen) {
inpos += n;
inlen -= n;
return l + n;
}
n -= inlen;
l += inlen;
inlen = 0;
inpos = 0;
return stream.skip(n) + l;
}
}