javasoundrenderer.java

FMJ（freedom media for java)是java视频开发的新选择

		{
			
			
			//logger.fine("Available: " + sourceLine.available());
			//logger.fine("length: " + length);
			//logger.fine("sourceLine.getBufferSize(): " + sourceLine.getBufferSize());
			
			final int n = sourceLine.write(data, offset, length);		// TODO: this can block for a very long time if it doesn't
			if (n >= length)
				break;
			else if (n == 0)
			{
				// TODO: we could choose to handle a write failure this way, 
				// assuming that it is considered legal to call stop while process is being called.
				// however, that seems like a bad idea in general.
//				if (!sourceLine.isRunning())
//				{	
//					buffer.setLength(offset);
//					buffer.setOffset(length);
//					return INPUT_BUFFER_NOT_CONSUMED;	// our write was interrupted.
//				}
				
				logger.warning("sourceLine.write returned 0, offset=" + offset + "; length=" + length + "; available=" + sourceLine.available() + "; frame size in bytes" + sourceLine.getFormat().getFrameSize() + "; sourceLine.isActive() = " + sourceLine.isActive() + "; " + sourceLine.isOpen() + "; sourceLine.isRunning()=" + sourceLine.isRunning() );
				return BUFFER_PROCESSED_FAILED;	// sourceLine.write docs indicate that this will only happen if there is an error.
				
				
			}
			else
			{	offset += n;
				length -= n;
			}
			
		}
		
		if (bufferNotConsumed)
		{
			// return INPUT_BUFFER_NOT_CONSUMED if not all bytes were written
			
			buffer.setLength(newBufferLength);
			buffer.setOffset(newBufferOffset);
			return INPUT_BUFFER_NOT_CONSUMED;
		}
		
		if (buffer.isEOM())
		{
			// TODO: the proper way to do this is to implement Drainable, and let the processor call our drain method.
			sourceLine.drain();	// we need to ensure that the media finishes playing, otherwise the EOM event will
			// be posted before the media finishes playing.
		}
		
		
		return BUFFER_PROCESSED_OK;
	}
	
	/* ----------------------------- */
	
	public int hashCode() {
		return super.hashCode() ^ 0xAD;	// TODO: this hash code change is useless.
		// TODO: for putting entries into the plugin manager, PlugInManager.addPlugIn appears to 
		// create a hash only based on the full class name, and only the last 22 chars of it.
		// that is, ClassNameInfo.makeHashValue("com.sun.media.renderer.audio.JavaSoundRenderer")
		// and      ClassNameInfo.makeHashValue("net.sf.fmj.media.renderer.audio.JavaSoundRenderer")
		// both return the same value, as does
		//          ClassNameInfo.makeHashValue("udio.JavaSoundRenderer")
		
		// therefore, this trick of creating a different hash code for this class, does nothing to avoid the
		// warnings, when JMF is ahead in the classpath:
		
//		Problem adding net.sf.fmj.media.renderer.audio.JavaSoundRenderer to plugin table.
//		 Already hash value of 1262232571547748861 in plugin table for class name of com.sun.media.renderer.audio.JavaSoundRenderer

		
	}
	
	/* -------------------- private methods ----------------------- */

	/**
	 * Convert javax.sound.sampled.AudioFormat to javax.media.format.AudioFormat.
	 */
	public static AudioFormat convertFormat(javax.sound.sampled.AudioFormat format) {
		
		Encoding encoding = format.getEncoding();
		int channels = format.getChannels();
		float frameRate = format.getFrameRate();
		int frameSize = format.getFrameSize() < 0 ? format.getFrameSize() : (format.getFrameSize() * 8);
		float sampleRate = format.getSampleRate();
		int sampleSize = format.getSampleSizeInBits();
		
		int endian = format.isBigEndian() ? AudioFormat.BIG_ENDIAN : AudioFormat.LITTLE_ENDIAN;
		
		int signed = AudioFormat.NOT_SPECIFIED;
		String encodingString = AudioFormat.LINEAR;

		if (encoding == Encoding.PCM_SIGNED) {
			signed = AudioFormat.SIGNED;
			encodingString = AudioFormat.LINEAR;
		}
		else if (encoding == Encoding.PCM_UNSIGNED) {
			signed = AudioFormat.UNSIGNED;
			encodingString = AudioFormat.LINEAR;
		}
		else if (encoding == Encoding.ALAW) {
			encodingString = AudioFormat.ALAW;
		}
		else if (encoding == Encoding.ULAW) {
			encodingString = AudioFormat.ULAW;
		}
		else {
			encodingString = encoding.toString();
		
		}
		
		AudioFormat jmfFormat = new AudioFormat(
				encodingString,
				(double) sampleRate,
				sampleSize,
				channels,
				endian,
				signed,
				frameSize,
				frameRate,
				AudioFormat.byteArray
			);
		
		return jmfFormat;
	}

	
	/**
	 * 
	 * @return null if doesn't match any mpeg encoding
	 */
	private static Encoding toMpegEncoding(String encodingStr)
	{
		// TODO: perhaps we should use reflection to avoid class not found problems if javazoom is not in the classpath.

		final Encoding[] mpegEncodings = new Encoding[] {
				MpegEncoding.MPEG1L1,
				MpegEncoding.MPEG1L2,
				MpegEncoding.MPEG1L3,
				MpegEncoding.MPEG2DOT5L1,
				MpegEncoding.MPEG2DOT5L2,
				MpegEncoding.MPEG2DOT5L3,
				MpegEncoding.MPEG2L1,
				MpegEncoding.MPEG2L2,
				MpegEncoding.MPEG2L3,
				
		};
		          
		for (int i = 0; i < mpegEncodings.length; ++i)
		{
			if (encodingStr.equals(mpegEncodings[i].toString()))
				return mpegEncodings[i];
		}
		return null;
		
		
	}
	
	/**
	 * 
	 * @return null if doesn't match any vorbis encoding
	 */
	private static Encoding toVorbisEncoding(String encodingStr)
	{
		// TODO: perhaps we should use reflection to avoid class not found problems if javazoom is not in the classpath.

		final Encoding[] vorbisEncodings = new Encoding[] {
				VorbisEncoding.VORBISENC
				
		};
		          
		for (int i = 0; i < vorbisEncodings.length; ++i)
		{
			if (encodingStr.equals(vorbisEncodings[i].toString()))
				return vorbisEncodings[i];
		}
		return null;
		
		
	}
	
	
	public static javax.sound.sampled.AudioFormat convertFormat(AudioFormat format) {
		
		String encodingString = format.getEncoding();
		int channels = format.getChannels();
		double frameRate = format.getFrameRate();
		int frameSize = format.getFrameSizeInBits() / 8;
		double sampleRate = format.getSampleRate();
		int sampleSize = format.getSampleSizeInBits();
		boolean endian = (format.getEndian() == AudioFormat.BIG_ENDIAN);
		int signed = format.getSigned();

		Encoding encoding;
		if (AudioFormat.LINEAR.equals(encodingString)) {
			switch(signed) {
			case AudioFormat.SIGNED:
				encoding = Encoding.PCM_SIGNED;
				break;
			case AudioFormat.UNSIGNED:
				encoding = Encoding.PCM_UNSIGNED;
				break;
			default:
				encoding = Encoding.PCM_SIGNED;	// TODO: return null
			}
		}
		else if (AudioFormat.ALAW.equals(encodingString)) {
			encoding = Encoding.ALAW;
		}
		else if (AudioFormat.ULAW.equals(encodingString)) {
			encoding = Encoding.ULAW;
		}
		else if (toMpegEncoding(encodingString) != null) {
			
			encoding = toMpegEncoding(encodingString);
	
		}
		else if (toVorbisEncoding(encodingString) != null) {
			
			encoding = toVorbisEncoding(encodingString);
	
		}
		else {
			encoding = new CustomEncoding(encodingString);
		}

		final javax.sound.sampled.AudioFormat sampledFormat;
		
		
		if (encoding == Encoding.PCM_SIGNED) {
			sampledFormat = new javax.sound.sampled.AudioFormat(
					(float)sampleRate,
					sampleSize,
					channels,
					true,
					endian
				);

		}
		else if (encoding == Encoding.PCM_UNSIGNED) {
			sampledFormat = new javax.sound.sampled.AudioFormat(
					(float)sampleRate,
					sampleSize,
					channels,
					false,
					endian
				);
		}
		else if (encoding instanceof MpegEncoding) {
			// TODO: perhaps we should use reflection to avoid class not found problems if javazoom is not in the classpath.
			return new MpegAudioFormat(
					encoding,	
					(float) sampleRate,
					sampleSize,
					channels,
					//signed,
					frameSize,
					(float) frameRate,
					endian,
					new HashMap()
				);
		}
		else if (encoding instanceof VorbisEncoding) {
			// TODO: perhaps we should use reflection to avoid class not found problems if javazoom is not in the classpath.
			return new VorbisAudioFormat(
					encoding,	
					(float) sampleRate,
					sampleSize,
					channels,
					//signed,
					frameSize,
					(float) frameRate,
					endian,
					new HashMap()
				);
		}
		else {
			sampledFormat = new javax.sound.sampled.AudioFormat(
				encoding,
				(float)sampleRate,
				sampleSize,
				channels,
				frameSize,
				(float)frameRate,
				endian
			);
		}		
		
		return sampledFormat;
	}
	
	private static List getMixers() {
		Vector mixers = new Vector();
		Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
		for (int i=0; i<mixerInfos.length; i++) {
			Mixer mixer = AudioSystem.getMixer(mixerInfos[i]);
			mixers.add(mixer);
		}
		return mixers;
	}

	private static void getMixer(String name) {
		Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
		for (int i=0; i<mixerInfos.length; i++) {
			//mixerInfos[i];
		}
	}
	/*
	private void logControls(SourceDataLine line) {
		sourceLine.getControl(BooleanControl.Type.MUTE);
		sourceLine.getControl(FloatControl.Type.VOLUME);
		sourceLine.getControl(FloatControl.Type.BALANCE);
		sourceLine.getControl(FloatControl.Type.PAN);
		
		Control[] audioControls = line.getControls();
	}
	*/
	
	private void logControls(Control[] controls) {
		for (int i=0; i<controls.length; i++) {
			Control control = controls[i];
			logger.info("control: " + control);
			Type controlType = control.getType();
			if (controlType instanceof CompoundControl.Type) {
				logControls(((CompoundControl)control).getMemberControls());
			}
		}
	}
}