rawhelper.java

java和flash混合编程

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 * Copyright (c) 2001, David N. Main, All rights reserved.
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 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the 
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 * 1. Redistributions of source code must retain the above 
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 * disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above 
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 * provided with the distribution.
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 * 3. The name of the author may not be used to endorse or 
 * promote products derived from this software without specific 
 * prior written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
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 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
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package com.anotherbigidea.flash.sound;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;

import com.anotherbigidea.flash.SWFConstants;
import com.anotherbigidea.flash.interfaces.SWFTagTypes;
import com.anotherbigidea.flash.structs.Color;
import com.anotherbigidea.flash.writers.SWFWriter;
import com.anotherbigidea.flash.writers.TagWriter;

/**
 * Raw Audio Utilities
 */
public class RawHelper
{
    /**
     * Read an audio input file that is supported by the Java Sound API
     * @param soundBlocks used to return the sound blocks (byte[]) - can be null
     */
    public static SoundStreamHead streamingBlocks( InputStream audioFile, 
                                                   int framesPerSecond, 
                                                   ArrayList soundBlocks ) 
        throws IOException, UnsupportedAudioFileException
    {                                        
        AudioInputStream audioIn = AudioSystem.getAudioInputStream( audioFile );
        //audioIn = AudioSystem.getAudioInputStream( format, audioIn );
        
        AudioFormat format = audioIn.getFormat();
        int frameSize = format.getFrameSize();
        boolean isStereo = format.getChannels() == 2;
        boolean is16Bit  = format.getSampleSizeInBits() > 8;
        int sampleRate   = (int)format.getSampleRate();
        
        //System.out.println( format );
        
        int rate = SWFConstants.SOUND_FREQ_5_5KHZ;
        
        if     ( sampleRate >= 44000 ) sampleRate = 44000;
        else if( sampleRate >= 22000 ) sampleRate = 22000;
        else if( sampleRate >= 11000 ) sampleRate = 11000;
        else sampleRate = 5500;

        if     ( sampleRate == 44000 ) rate = SWFConstants.SOUND_FREQ_44KHZ;
        else if( sampleRate == 22000 ) rate = SWFConstants.SOUND_FREQ_22KHZ;
        else if( sampleRate == 11000 ) rate = SWFConstants.SOUND_FREQ_11KHZ;        
        
        int samplesPerFrame = sampleRate / framesPerSecond;
        int blockSize       = samplesPerFrame * (is16Bit ? 2 : 1 ) * (isStereo ? 2 : 1 );
               
        SoundStreamHead soundHead = new SoundStreamHead( rate, is16Bit, isStereo,
                                                         SWFConstants.SOUND_FORMAT_RAW,
                                                         rate, is16Bit, isStereo, 
                                                         samplesPerFrame );
        
        if( soundBlocks == null ) return soundHead;
        
        ByteArrayOutputStream bout = new ByteArrayOutputStream( blockSize + 1000 );
        
        while( true  )
        {        
            bout.reset();
            
            byte[] b = new byte[ frameSize ];
            int num  = 0;
            int read = 0;

            while( num < blockSize )
            {
                read = 0;
                
                while( (read = audioIn.read( b, read, frameSize-read )) < frameSize && read != -1 );
                
                if( read == -1 ) break;
                
                bout.write( b );
                num += read;
            }
            
            //pad the block with zeroes
            while( num < blockSize )
            {
                bout.write(0x80);
                num++;
            }
                
            soundBlocks.add( bout.toByteArray() );
            
            if( read == -1 ) break;
        }
        
        return soundHead;
    }
    
    public static SoundDefinition getSoundDefinition( InputStream audioFile, int framesPerSecond) 
        throws IOException, UnsupportedAudioFileException
    {
        AudioInputStream audioIn = AudioSystem.getAudioInputStream( new BufferedInputStream( audioFile ));
        //audioIn = AudioSystem.getAudioInputStream( format, audioIn );
        
        AudioFormat format = audioIn.getFormat();
        int frameSize = format.getFrameSize();
        boolean isStereo = format.getChannels() == 2;
        boolean is16bit  = format.getSampleSizeInBits() > 8;
        int sampleRate   = (int)format.getSampleRate();
        
        //System.out.println( format );
        
        int rate = SWFConstants.SOUND_FREQ_5_5KHZ;
        
        if     ( sampleRate >= 44000 ) sampleRate = 44000;
        else if( sampleRate >= 22000 ) sampleRate = 22000;
        else if( sampleRate >= 11000 ) sampleRate = 11000;
        else sampleRate = 5500;

        if     ( sampleRate == 44000 ) rate = SWFConstants.SOUND_FREQ_44KHZ;
        else if( sampleRate == 22000 ) rate = SWFConstants.SOUND_FREQ_22KHZ;
        else if( sampleRate == 11000 ) rate = SWFConstants.SOUND_FREQ_11KHZ;        
                
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ADPCMHelper.FramedInputStream in = new ADPCMHelper.FramedInputStream( audioIn, frameSize );
        int b = 0;
        int count = 0;
        
        while( (b = in.read()) >= 0 )
        {        
            count++;
            bout.write( b );            
        }
                
        int sampleCount = count;
        if( is16bit  ) sampleCount /= 2;
        if( isStereo ) sampleCount /= 2;
                
        byte[] soundData = bout.toByteArray();
        return new SoundDefinition( SWFConstants.SOUND_FORMAT_RAW, rate, is16bit, isStereo, sampleCount, soundData );
    }    
    
    /**
     * Makes a streaming SWF from a Java Sound compatible audio file.
     * args[0] = audio in filename
     * args[1] = SWF out filename
     */
    public static void main( String[] args ) throws Exception
    {
        InputStream audioFile     = new BufferedInputStream( new FileInputStream( args[0] ));
        SWFWriter       swfwriter = new SWFWriter( args[1] );
        
        SWFTagTypes tags = new TagWriter( swfwriter );
        
        tags.header( 5, -1, 200, 200, 12, -1 );
        tags.tagSetBackgroundColor( new Color(255,255,255));
        
        ArrayList blocks = new ArrayList();
                          
        SoundStreamHead header = streamingBlocks( audioFile, 12, blocks );
        audioFile.close();
        
        header.write( tags );
        
        for( Iterator it = blocks.iterator(); it.hasNext(); )
        {
            byte[] data = (byte[])it.next();
            
            tags.tagSoundStreamBlock( data );
            tags.tagShowFrame();
        }

        tags.tagEnd();
    }
}