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IcyInputStream.java
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IcyInputStream.java
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/*
** AACDecoder - Freeware Advanced Audio (AAC) Decoder for Android
** Copyright (C) 2012 Spolecne s.r.o., http://www.spoledge.com
**
** This file is a part of AACDecoder.
**
** AACDecoder is free software; you can redistribute it and/or modify
** it under the terms of the GNU Lesser General Public License as published
** by the Free Software Foundation; either version 3 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 Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.spoledge.aacdecoder;
import android.util.Log;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* This is an InputStream which allows to fetch Icecast/Shoutcast metadata from.
*/
public class IcyInputStream extends FilterInputStream {
private static final String LOG = "IcyInputStream";
////////////////////////////////////////////////////////////////////////////
// Attributes
////////////////////////////////////////////////////////////////////////////
/**
* The period of metadata frame in bytes.
*/
protected int period;
/**
* The actual number of remaining bytes before the metadata.
*/
protected int remaining;
/**
* This is a temporary buffer used for fetching metadata bytes.
*/
protected byte[] mbuffer;
/**
* The callback - may be null.
*/
protected PlayerCallback playerCallback;
/**
* The character encoding of the metadata.
*/
protected String characterEncoding;
////////////////////////////////////////////////////////////////////////////
// Constructors
////////////////////////////////////////////////////////////////////////////
/**
* Creates a new input stream.
* @param in the underlying input stream
* @param period the period of metadata frame is repeating (in bytes)
*/
public IcyInputStream( InputStream in, int period ) {
this( in, period, null );
}
/**
* Creates a new input stream.
* @param in the underlying input stream
* @param period the period of metadata frame is repeating (in bytes)
* @param playerCallback the callback - may be null
*/
public IcyInputStream( InputStream in, int period, PlayerCallback playerCallback ) {
this( in, period, playerCallback, null );
}
/**
* Creates a new input stream.
* @param in the underlying input stream
* @param period the period of metadata frame is repeating (in bytes)
* @param playerCallback the callback - may be null
* @param characterEncoding the encoding used for metadata strings - may be null = default is UTF-8
*/
public IcyInputStream( InputStream in, int period, PlayerCallback playerCallback, String characterEncoding ) {
super( in );
this.period = period;
this.playerCallback = playerCallback;
this.characterEncoding = characterEncoding != null ? characterEncoding : "UTF-8";
remaining = period;
mbuffer = new byte[128];
}
////////////////////////////////////////////////////////////////////////////
// InputStream
////////////////////////////////////////////////////////////////////////////
@Override
public int read() throws IOException {
int ret = super.read();
if (--remaining == 0) fetchMetadata();
return ret;
}
@Override
public int read( byte[] buffer, int offset, int len ) throws IOException {
int ret = in.read( buffer, offset, remaining < len ? remaining : len );
if (remaining == ret) fetchMetadata();
else remaining -= ret;
return ret;
}
////////////////////////////////////////////////////////////////////////////
// Public
////////////////////////////////////////////////////////////////////////////
public String getCharacterEncoding() {
return characterEncoding;
}
/**
* Sets the character encoding used for the metadata strings.
* By default it is set to UTF-8.
*/
public void setCharacterEncoding( String characterEncoding ) {
this.characterEncoding = characterEncoding;
}
////////////////////////////////////////////////////////////////////////////
// Protected
////////////////////////////////////////////////////////////////////////////
/**
* This method reads the metadata string.
* Actually it calls the method parseMetadata().
*/
protected void fetchMetadata() throws IOException {
remaining = period;
int size = in.read();
// either no metadata or eof:
if (size < 1) return;
// size *= 16:
size <<= 4;
if (mbuffer.length < size) {
mbuffer = null;
mbuffer = new byte[ size ];
Log.d( LOG, "Enlarged metadata buffer to " + size + " bytes");
}
size = readFully( mbuffer, 0, size );
// find the string end:
for (int i=0; i < size; i++) {
if (mbuffer[i] == 0) {
size = i;
break;
}
}
String s;
try {
s = new String( mbuffer, 0, size, characterEncoding );
}
catch (Exception e) {
Log.e( LOG, "Cannot convert bytes to String" );
return;
}
Log.d( LOG, "Metadata string: " + s );
parseMetadata( s );
}
/**
* Parses the metadata and sends them to PlayerCallback.
* @param s the metadata string like: StreamTitle='...';StreamUrl='...';
*/
protected void parseMetadata( String s ) {
String[] kvs = s.split( ";" );
for (String kv : kvs) {
int n = kv.indexOf( '=' );
if (n < 1) continue;
boolean isString = n + 1 < kv.length()
&& kv.charAt( kv.length() - 1) == '\''
&& kv.charAt( n + 1 ) == '\'';
String key = kv.substring( 0, n );
String val = isString ?
kv.substring( n+2, kv.length()-1) :
n + 1 < kv.length() ?
kv.substring( n+1 ) : "";
// yes - we should detect this earlier, but it will not be null in most cases:
if (playerCallback != null) playerCallback.playerMetadata( key, val );
}
}
/**
* Tries to read all bytes into the target buffer.
* @param size the requested size
* @return the number of really bytes read; if less than requested, then eof detected
*/
protected final int readFully( byte[] buffer, int offset, int size ) throws IOException {
int n;
int oo = offset;
while (size > 0 && (n = in.read( buffer, offset, size )) != -1) {
offset += n;
size -= n;
}
return offset - oo;
}
}