changeset 31:d8ff8c5ad52a

Add host program, working like a minimal version of vamp-simple-host

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/host/host.java	Thu Nov 22 14:31:23 2012 +0000
@@ -0,0 +1,201 @@
+
+import java.util.ArrayList;
+import java.util.TreeMap;
+import java.util.Map;
+import java.util.List;
+import java.lang.RuntimeException;
+
+import org.vamp_plugins.PluginLoader;
+import org.vamp_plugins.Plugin;
+import org.vamp_plugins.ParameterDescriptor;
+import org.vamp_plugins.OutputDescriptor;
+import org.vamp_plugins.Feature;
+import org.vamp_plugins.RealTime;
+
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.UnsupportedAudioFileException;
+
+import java.io.File;
+import java.io.IOException;
+
+public class host
+{
+    private static void printFeatures(RealTime frameTime, Integer output,
+				      Map<Integer, ArrayList<Feature>> features)
+    {
+	if (!features.containsKey(output)) return;
+
+	for (Feature f : features.get(output)) {
+	    if (f.hasTimestamp) {
+		System.out.print(f.timestamp);
+	    } else {
+		System.out.print(frameTime);
+	    }
+	    if (f.hasDuration) {
+		System.out.print("," + f.duration);
+	    }
+	    System.out.print(":");
+	    for (float v : f.values) {
+		System.out.print(" " + v);
+	    }
+	    System.out.print(" " + f.label);
+	    System.out.println("");
+	}
+    }
+
+    private static void usage() {
+	System.err.println("Usage: host pluginlibrary:plugin:output file.wav");
+    }
+
+    private static int readBlock(AudioFormat format, AudioInputStream stream,
+				 float[][] buffers)
+	throws java.io.IOException
+    {
+	// 16-bit LE signed PCM only
+	int channels = format.getChannels();
+	byte[] raw = new byte[buffers[0].length * channels * 2];
+	int read = stream.read(raw);
+	if (read < 0) return read;
+	int frames = read / (channels * 2);
+	for (int i = 0; i < frames; ++i) {
+	    for (int c = 0; c < channels; ++c) {
+		int ix = i * channels + c;
+		int ival = (raw[ix*2] & 0xff) | (raw[ix*2 + 1] << 8);
+		float fval = ival / 32768.0f;
+		buffers[c][i] = fval;
+	    }
+	}
+	return frames;
+    }
+
+    public static void main(String[] args)
+    {
+	if (args.length < 2) {
+	    usage();
+	    return;
+	}
+
+	PluginLoader loader = PluginLoader.getInstance();
+
+	String key = args[0];
+	String filename = args[1];
+
+	String[] keyparts = key.split(":");
+	if (keyparts.length < 3) {
+	    usage();
+	    return;
+	}
+	
+	String pluginKey = keyparts[0] + ":" + keyparts[1];
+	String outputKey = keyparts[2];
+
+	try {
+	    File f = new File(filename);
+	    AudioInputStream stream = AudioSystem.getAudioInputStream(f);
+	    AudioFormat format = stream.getFormat();
+
+	    if (format.getSampleSizeInBits() != 16 ||
+		format.getEncoding() != AudioFormat.Encoding.PCM_SIGNED ||
+		format.isBigEndian()) {
+		System.err.println("Sorry, only 16-bit signed little-endian PCM files supported");
+		return;
+	    }
+
+	    float rate = format.getFrameRate();
+	    int channels = format.getChannels();
+	    int bytesPerFrame = format.getFrameSize();
+	    int blockSize = 1024; // frames
+
+	    Plugin p = loader.loadPlugin
+		(pluginKey, rate, PluginLoader.AdapterFlags.ADAPT_ALL);
+
+	    OutputDescriptor[] outputs = p.getOutputDescriptors();
+	    int outputNumber = -1;
+	    for (int i = 0; i < outputs.length; ++i) {
+		if (outputs[i].identifier.equals(outputKey)) outputNumber = i;
+	    }
+	    if (outputNumber < 0) {
+		System.err.println("Plugin lacks output id: " + outputKey);
+		System.err.print("Outputs are:");
+		for (int i = 0; i < outputs.length; ++i) {
+		    System.err.print(" " + outputs[i].identifier);
+		}
+		System.err.println("");
+		return;
+	    }
+	    
+	    boolean b = p.initialise(channels, blockSize, blockSize);
+	    if (!b) {
+		System.err.println("Plugin initialise failed");
+		return;
+	    }
+	    
+	    float[][] buffers = new float[channels][blockSize];
+
+	    boolean done = false;
+	    boolean incomplete = false;
+	    int block = 0;
+
+	    while (!done) {
+
+		for (int c = 0; c < channels; ++c) {
+		    for (int i = 0; i < blockSize; ++i) {
+			buffers[c][i] = 0.0f;
+		    }
+		}
+
+		int read = readBlock(format, stream, buffers);
+
+		if (read < 0) {
+		    done = true;
+		} else {
+
+		    if (incomplete) {
+			// An incomplete block is only OK if it's the
+			// last one -- so if the previous block was
+			// incomplete, we have trouble
+			System.err.println("Audio file read incomplete! Short buffer detected at " + block * blockSize);
+			return;
+		    }
+		    
+		    incomplete = (read < buffers[0].length);
+
+		    RealTime timestamp = RealTime.frame2RealTime
+			(block * blockSize, (int)(rate + 0.5));
+
+		    TreeMap<Integer, ArrayList<Feature>>
+			features = p.process(buffers, timestamp);
+
+		    printFeatures(timestamp, outputNumber, features);
+
+		    timestamp.dispose();
+		}
+		
+		++block;
+	    }
+
+	    TreeMap<Integer, ArrayList<Feature>>
+		features = p.getRemainingFeatures();
+
+	    RealTime timestamp = RealTime.frame2RealTime
+		(block * blockSize, (int)(rate + 0.5));
+	    printFeatures(timestamp, outputNumber, features);
+	    timestamp.dispose();
+
+	    p.dispose();
+
+	} catch (java.io.IOException e) {
+	    System.err.println("Failed to read audio file: " + e.getMessage());
+
+	} catch (javax.sound.sampled.UnsupportedAudioFileException e) {
+	    System.err.println("Unsupported audio file format: " + e.getMessage());
+
+	} catch (PluginLoader.LoadFailedException e) {
+	    System.err.println("Plugin load failed (unknown plugin?): key is " +
+			       key);
+	}
+    }
+}
+