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POJava SFXR Port - Trouble writing byte[] to WAV file
 

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  1. POJava SFXR Port - Trouble writing byte[] to WAV file
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    <p>I'm using a Java port of the sound effect generator SFXR, which involves lots of arcane music code that I don't understand, being something of a novice when it comes to anything to do with audio. What I do know is that the code can reliably generate and play sounds within Java, using a SourceDataLine object.</p> <p>The data that the SDL object uses is stored in a byte[]. However, simply writing this out to a file doesn't work (presumably because of the lack of a WAV header, or so I thought).</p> <p>However, I downloaded this WAV read/write class: <a href="http://computermusicblog.com/blog/2008/08/29/reading-and-writing-wav-files-in-java/" rel="nofollow">http://computermusicblog.com/blog/2008/08/29/reading-and-writing-wav-files-in-java/</a> which adds in header information when it writes a WAV file. Giving it the byte[] data from SFXR still produces files that can't be played by any music player I have.</p> <p>I figure I must be missing something. Here's the relevant code when it plays the sound data:</p> <pre><code>public void play(int millis) throws Exception { AudioFormat stereoFormat = getStereoAudioFormat(); SourceDataLine stereoSdl = AudioSystem.getSourceDataLine(stereoFormat); if (!stereoSdl.isOpen()) { try { stereoSdl.open(); } catch (LineUnavailableException e) { e.printStackTrace(); } } if (!stereoSdl.isRunning()) { stereoSdl.start(); } double seconds = millis / 1000.0; int bufferSize = (int) (4 * 41000 * seconds); byte[] target = new byte[bufferSize]; writeBytes(target); stereoSdl.write(target, 0, target.length); } </code></pre> <p>That's from the SFXR port. Here's the save() file from the WavIO class (there's a lot of other code in that class of course, I figured this might be worth posting in case someone wants to see exactly how the buffer data is being handled:</p> <pre><code> public boolean save() { try { DataOutputStream outFile = new DataOutputStream(new FileOutputStream(myPath)); // write the wav file per the wav file format outFile.writeBytes("RIFF"); // 00 - RIFF outFile.write(intToByteArray((int)myChunkSize), 0, 4); // 04 - how big is the rest of this file? outFile.writeBytes("WAVE"); // 08 - WAVE outFile.writeBytes("fmt "); // 12 - fmt outFile.write(intToByteArray((int)mySubChunk1Size), 0, 4); // 16 - size of this chunk outFile.write(shortToByteArray((short)myFormat), 0, 2); // 20 - what is the audio format? 1 for PCM = Pulse Code Modulation outFile.write(shortToByteArray((short)myChannels), 0, 2); // 22 - mono or stereo? 1 or 2? (or 5 or ???) outFile.write(intToByteArray((int)mySampleRate), 0, 4); // 24 - samples per second (numbers per second) outFile.write(intToByteArray((int)myByteRate), 0, 4); // 28 - bytes per second outFile.write(shortToByteArray((short)myBlockAlign), 0, 2); // 32 - # of bytes in one sample, for all channels outFile.write(shortToByteArray((short)myBitsPerSample), 0, 2); // 34 - how many bits in a sample(number)? usually 16 or 24 outFile.writeBytes("data"); // 36 - data outFile.write(intToByteArray((int)myDataSize), 0, 4); // 40 - how big is this data chunk outFile.write(myData); // 44 - the actual data itself - just a long string of numbers } catch(Exception e) { System.out.println(e.getMessage()); return false; } return true; } </code></pre> <p>All I know is, I've got a bunch of data, and I want it to end up in a playable audio file of some kind (at this point I'd take ANY format!). What's the best way for me to get this byte buffer into a playable file? Or is this byte[] not what I think it is?</p>
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    1. USMark McLaren
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    1. CODo you have a link to the SFXR port you are talking about?
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      1. USSam Goldberg
 

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