| /* |
| * Copyright (c) 1999, 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.sound.sampled; |
| |
| import java.io.InputStream; |
| import java.io.PushbackInputStream; |
| import java.io.IOException; |
| |
| |
| /** |
| * An audio input stream is an input stream with a specified audio format and |
| * length. The length is expressed in sample frames, not bytes. |
| * Several methods are provided for reading a certain number of bytes from |
| * the stream, or an unspecified number of bytes. |
| * The audio input stream keeps track of the last byte that was read. |
| * You can skip over an arbitrary number of bytes to get to a later position |
| * for reading. An audio input stream may support marks. When you set a mark, |
| * the current position is remembered so that you can return to it later. |
| * <p> |
| * The <code>AudioSystem</code> class includes many methods that manipulate |
| * <code>AudioInputStream</code> objects. |
| * For example, the methods let you: |
| * <ul> |
| * <li> obtain an |
| * audio input stream from an external audio file, stream, or URL |
| * <li> write an external file from an audio input stream |
| * <li> convert an audio input stream to a different audio format |
| * </ul> |
| * |
| * @author David Rivas |
| * @author Kara Kytle |
| * @author Florian Bomers |
| * |
| * @see AudioSystem |
| * @see Clip#open(AudioInputStream) Clip.open(AudioInputStream) |
| * @since 1.3 |
| */ |
| public class AudioInputStream extends InputStream { |
| |
| /** |
| * The <code>InputStream</code> from which this <code>AudioInputStream</code> |
| * object was constructed. |
| */ |
| private InputStream stream; |
| |
| /** |
| * The format of the audio data contained in the stream. |
| */ |
| protected AudioFormat format; |
| |
| /** |
| * This stream's length, in sample frames. |
| */ |
| protected long frameLength; |
| |
| /** |
| * The size of each frame, in bytes. |
| */ |
| protected int frameSize; |
| |
| /** |
| * The current position in this stream, in sample frames (zero-based). |
| */ |
| protected long framePos; |
| |
| /** |
| * The position where a mark was set. |
| */ |
| private long markpos; |
| |
| /** |
| * When the underlying stream could only return |
| * a non-integral number of frames, store |
| * the remainder in a temporary buffer |
| */ |
| private byte[] pushBackBuffer = null; |
| |
| /** |
| * number of valid bytes in the pushBackBuffer |
| */ |
| private int pushBackLen = 0; |
| |
| /** |
| * MarkBuffer at mark position |
| */ |
| private byte[] markPushBackBuffer = null; |
| |
| /** |
| * number of valid bytes in the markPushBackBuffer |
| */ |
| private int markPushBackLen = 0; |
| |
| |
| /** |
| * Constructs an audio input stream that has the requested format and length in sample frames, |
| * using audio data from the specified input stream. |
| * @param stream the stream on which this <code>AudioInputStream</code> |
| * object is based |
| * @param format the format of this stream's audio data |
| * @param length the length in sample frames of the data in this stream |
| */ |
| public AudioInputStream(InputStream stream, AudioFormat format, long length) { |
| |
| super(); |
| |
| this.format = format; |
| this.frameLength = length; |
| this.frameSize = format.getFrameSize(); |
| |
| // any frameSize that is not well-defined will |
| // cause that this stream will be read in bytes |
| if( this.frameSize == AudioSystem.NOT_SPECIFIED || frameSize <= 0) { |
| this.frameSize = 1; |
| } |
| |
| this.stream = stream; |
| framePos = 0; |
| markpos = 0; |
| } |
| |
| |
| /** |
| * Constructs an audio input stream that reads its data from the target |
| * data line indicated. The format of the stream is the same as that of |
| * the target data line, and the length is AudioSystem#NOT_SPECIFIED. |
| * @param line the target data line from which this stream obtains its data. |
| * @see AudioSystem#NOT_SPECIFIED |
| */ |
| public AudioInputStream(TargetDataLine line) { |
| |
| TargetDataLineInputStream tstream = new TargetDataLineInputStream(line); |
| format = line.getFormat(); |
| frameLength = AudioSystem.NOT_SPECIFIED; |
| frameSize = format.getFrameSize(); |
| |
| if( frameSize == AudioSystem.NOT_SPECIFIED || frameSize <= 0) { |
| frameSize = 1; |
| } |
| this.stream = tstream; |
| framePos = 0; |
| markpos = 0; |
| } |
| |
| |
| /** |
| * Obtains the audio format of the sound data in this audio input stream. |
| * @return an audio format object describing this stream's format |
| */ |
| public AudioFormat getFormat() { |
| return format; |
| } |
| |
| |
| /** |
| * Obtains the length of the stream, expressed in sample frames rather than bytes. |
| * @return the length in sample frames |
| */ |
| public long getFrameLength() { |
| return frameLength; |
| } |
| |
| |
| /** |
| * Reads the next byte of data from the audio input stream. The audio input |
| * stream's frame size must be one byte, or an <code>IOException</code> |
| * will be thrown. |
| * |
| * @return the next byte of data, or -1 if the end of the stream is reached |
| * @throws IOException if an input or output error occurs |
| * @see #read(byte[], int, int) |
| * @see #read(byte[]) |
| * @see #available |
| * <p> |
| */ |
| public int read() throws IOException { |
| if( frameSize != 1 ) { |
| throw new IOException("cannot read a single byte if frame size > 1"); |
| } |
| |
| byte[] data = new byte[1]; |
| int temp = read(data); |
| if (temp <= 0) { |
| // we have a weird situation if read(byte[]) returns 0! |
| return -1; |
| } |
| return data[0] & 0xFF; |
| } |
| |
| |
| /** |
| * Reads some number of bytes from the audio input stream and stores them into |
| * the buffer array <code>b</code>. The number of bytes actually read is |
| * returned as an integer. This method blocks until input data is |
| * available, the end of the stream is detected, or an exception is thrown. |
| * <p>This method will always read an integral number of frames. |
| * If the length of the array is not an integral number |
| * of frames, a maximum of <code>b.length - (b.length % frameSize) |
| * </code> bytes will be read. |
| * |
| * @param b the buffer into which the data is read |
| * @return the total number of bytes read into the buffer, or -1 if there |
| * is no more data because the end of the stream has been reached |
| * @throws IOException if an input or output error occurs |
| * @see #read(byte[], int, int) |
| * @see #read() |
| * @see #available |
| */ |
| public int read(byte[] b) throws IOException { |
| return read(b,0,b.length); |
| } |
| |
| |
| /** |
| * Reads up to a specified maximum number of bytes of data from the audio |
| * stream, putting them into the given byte array. |
| * <p>This method will always read an integral number of frames. |
| * If <code>len</code> does not specify an integral number |
| * of frames, a maximum of <code>len - (len % frameSize) |
| * </code> bytes will be read. |
| * |
| * @param b the buffer into which the data is read |
| * @param off the offset, from the beginning of array <code>b</code>, at which |
| * the data will be written |
| * @param len the maximum number of bytes to read |
| * @return the total number of bytes read into the buffer, or -1 if there |
| * is no more data because the end of the stream has been reached |
| * @throws IOException if an input or output error occurs |
| * @see #read(byte[]) |
| * @see #read() |
| * @see #skip |
| * @see #available |
| */ |
| public int read(byte[] b, int off, int len) throws IOException { |
| |
| // make sure we don't read fractions of a frame. |
| if( (len%frameSize) != 0 ) { |
| len -= (len%frameSize); |
| if (len == 0) { |
| return 0; |
| } |
| } |
| |
| if( frameLength != AudioSystem.NOT_SPECIFIED ) { |
| if( framePos >= frameLength ) { |
| return -1; |
| } else { |
| |
| // don't try to read beyond our own set length in frames |
| if( (len/frameSize) > (frameLength-framePos) ) { |
| len = (int) (frameLength-framePos) * frameSize; |
| } |
| } |
| } |
| |
| int bytesRead = 0; |
| int thisOff = off; |
| |
| // if we've bytes left from last call to read(), |
| // use them first |
| if (pushBackLen > 0 && len >= pushBackLen) { |
| System.arraycopy(pushBackBuffer, 0, |
| b, off, pushBackLen); |
| thisOff += pushBackLen; |
| len -= pushBackLen; |
| bytesRead += pushBackLen; |
| pushBackLen = 0; |
| } |
| |
| int thisBytesRead = stream.read(b, thisOff, len); |
| if (thisBytesRead == -1) { |
| return -1; |
| } |
| if (thisBytesRead > 0) { |
| bytesRead += thisBytesRead; |
| } |
| if (bytesRead > 0) { |
| pushBackLen = bytesRead % frameSize; |
| if (pushBackLen > 0) { |
| // copy everything we got from the beginning of the frame |
| // to our pushback buffer |
| if (pushBackBuffer == null) { |
| pushBackBuffer = new byte[frameSize]; |
| } |
| System.arraycopy(b, off + bytesRead - pushBackLen, |
| pushBackBuffer, 0, pushBackLen); |
| bytesRead -= pushBackLen; |
| } |
| // make sure to update our framePos |
| framePos += bytesRead/frameSize; |
| } |
| return bytesRead; |
| } |
| |
| |
| /** |
| * Skips over and discards a specified number of bytes from this |
| * audio input stream. |
| * @param n the requested number of bytes to be skipped |
| * @return the actual number of bytes skipped |
| * @throws IOException if an input or output error occurs |
| * @see #read |
| * @see #available |
| */ |
| public long skip(long n) throws IOException { |
| |
| // make sure not to skip fractional frames |
| if( (n%frameSize) != 0 ) { |
| n -= (n%frameSize); |
| } |
| |
| if( frameLength != AudioSystem.NOT_SPECIFIED ) { |
| // don't skip more than our set length in frames. |
| if( (n/frameSize) > (frameLength-framePos) ) { |
| n = (frameLength-framePos) * frameSize; |
| } |
| } |
| long temp = stream.skip(n); |
| |
| // if no error, update our position. |
| if( temp%frameSize != 0 ) { |
| |
| // Throw an IOException if we've skipped a fractional number of frames |
| throw new IOException("Could not skip an integer number of frames."); |
| } |
| if( temp >= 0 ) { |
| framePos += temp/frameSize; |
| } |
| return temp; |
| |
| } |
| |
| |
| /** |
| * Returns the maximum number of bytes that can be read (or skipped over) from this |
| * audio input stream without blocking. This limit applies only to the next invocation of |
| * a <code>read</code> or <code>skip</code> method for this audio input stream; the limit |
| * can vary each time these methods are invoked. |
| * Depending on the underlying stream,an IOException may be thrown if this |
| * stream is closed. |
| * @return the number of bytes that can be read from this audio input stream without blocking |
| * @throws IOException if an input or output error occurs |
| * @see #read(byte[], int, int) |
| * @see #read(byte[]) |
| * @see #read() |
| * @see #skip |
| */ |
| public int available() throws IOException { |
| |
| int temp = stream.available(); |
| |
| // don't return greater than our set length in frames |
| if( (frameLength != AudioSystem.NOT_SPECIFIED) && ( (temp/frameSize) > (frameLength-framePos)) ) { |
| return (int) (frameLength-framePos) * frameSize; |
| } else { |
| return temp; |
| } |
| } |
| |
| |
| /** |
| * Closes this audio input stream and releases any system resources associated |
| * with the stream. |
| * @throws IOException if an input or output error occurs |
| */ |
| public void close() throws IOException { |
| stream.close(); |
| } |
| |
| |
| /** |
| * Marks the current position in this audio input stream. |
| * @param readlimit the maximum number of bytes that can be read before |
| * the mark position becomes invalid. |
| * @see #reset |
| * @see #markSupported |
| */ |
| |
| public void mark(int readlimit) { |
| |
| stream.mark(readlimit); |
| if (markSupported()) { |
| markpos = framePos; |
| // remember the pushback buffer |
| markPushBackLen = pushBackLen; |
| if (markPushBackLen > 0) { |
| if (markPushBackBuffer == null) { |
| markPushBackBuffer = new byte[frameSize]; |
| } |
| System.arraycopy(pushBackBuffer, 0, markPushBackBuffer, 0, markPushBackLen); |
| } |
| } |
| } |
| |
| |
| /** |
| * Repositions this audio input stream to the position it had at the time its |
| * <code>mark</code> method was last invoked. |
| * @throws IOException if an input or output error occurs. |
| * @see #mark |
| * @see #markSupported |
| */ |
| public void reset() throws IOException { |
| |
| stream.reset(); |
| framePos = markpos; |
| // re-create the pushback buffer |
| pushBackLen = markPushBackLen; |
| if (pushBackLen > 0) { |
| if (pushBackBuffer == null) { |
| pushBackBuffer = new byte[frameSize - 1]; |
| } |
| System.arraycopy(markPushBackBuffer, 0, pushBackBuffer, 0, pushBackLen); |
| } |
| } |
| |
| |
| /** |
| * Tests whether this audio input stream supports the <code>mark</code> and |
| * <code>reset</code> methods. |
| * @return <code>true</code> if this stream supports the <code>mark</code> |
| * and <code>reset</code> methods; <code>false</code> otherwise |
| * @see #mark |
| * @see #reset |
| */ |
| public boolean markSupported() { |
| |
| return stream.markSupported(); |
| } |
| |
| |
| /** |
| * Private inner class that makes a TargetDataLine look like an InputStream. |
| */ |
| private class TargetDataLineInputStream extends InputStream { |
| |
| /** |
| * The TargetDataLine on which this TargetDataLineInputStream is based. |
| */ |
| TargetDataLine line; |
| |
| |
| TargetDataLineInputStream(TargetDataLine line) { |
| super(); |
| this.line = line; |
| } |
| |
| |
| public int available() throws IOException { |
| return line.available(); |
| } |
| |
| //$$fb 2001-07-16: added this method to correctly close the underlying TargetDataLine. |
| // fixes bug 4479984 |
| public void close() throws IOException { |
| // the line needs to be flushed and stopped to avoid a dead lock... |
| // Probably related to bugs 4417527, 4334868, 4383457 |
| if (line.isActive()) { |
| line.flush(); |
| line.stop(); |
| } |
| line.close(); |
| } |
| |
| public int read() throws IOException { |
| |
| byte[] b = new byte[1]; |
| |
| int value = read(b, 0, 1); |
| |
| if (value == -1) { |
| return -1; |
| } |
| |
| value = (int)b[0]; |
| |
| if (line.getFormat().getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)) { |
| value += 128; |
| } |
| |
| return value; |
| } |
| |
| |
| public int read(byte[] b, int off, int len) throws IOException { |
| try { |
| return line.read(b, off, len); |
| } catch (IllegalArgumentException e) { |
| throw new IOException(e.getMessage()); |
| } |
| } |
| } |
| } |