Android基于PocketSphinx的离线命令词识别DEMO

package edu.cmu.pocketsphinx.demo; import java.util.concurrent.LinkedBlockingQueue; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.Bundle; import android.util.Log; import edu.cmu.pocketsphinx.Config; import edu.cmu.pocketsphinx.Decoder; import edu.cmu.pocketsphinx.Hypothesis; import edu.cmu.pocketsphinx.pocketsphinx; /** * Speech recognition task, which runs in a worker thread. * * This class implements speech recognition for this demo application. It takes * the form of a long-running task which accepts requests to start and stop * listening, and emits recognition results to a listener. * * @author David Huggins-Daines <dhuggins@cs.cmu.edu> */ public class RecognizerTask implements Runnable { /** * Audio recording task. * * This class implements a task which pulls blocks of audio from the system * audio input and places them on a queue. * * @author David Huggins-Daines <dhuggins@cs.cmu.edu> */ class AudioTask implements Runnable { /** * Queue on which audio blocks are placed. */ LinkedBlockingQueue<short[]> q; AudioRecord rec; int block_size; boolean done; static final int DEFAULT_BLOCK_SIZE = 512; AudioTask() { this.init(new LinkedBlockingQueue<short[]>(), DEFAULT_BLOCK_SIZE); } AudioTask(LinkedBlockingQueue<short[]> q) { this.init(q, DEFAULT_BLOCK_SIZE); } AudioTask(LinkedBlockingQueue<short[]> q, int block_size) { this.init(q, block_size); } void init(LinkedBlockingQueue<short[]> q, int block_size) { this.done = false; this.q = q; this.block_size = block_size; this.rec = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, 8000, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, 8192); } public int getBlockSize() { return block_size; } public void setBlockSize(int block_size) { this.block_size = block_size; } public LinkedBlockingQueue<short[]> getQueue() { return q; } public void stop() { this.done = true; } public void run() { this.rec.startRecording(); while (!this.done) { int nshorts = this.readBlock(); if (nshorts <= 0) break; } this.rec.stop(); this.rec.release(); } int readBlock() { short[] buf = new short[this.block_size]; int nshorts = this.rec.read(buf, 0, buf.length); if (nshorts > 0) { Log.d(getClass().getName(), "Posting " + nshorts + " samples to queue"); this.q.add(buf); } return nshorts; } } /** * PocketSphinx native decoder object. */ Decoder ps; /** * Audio recording task. */ AudioTask audio; /** * Thread associated with recording task. */ Thread audio_thread; /** * Queue of audio buffers. */ LinkedBlockingQueue<short[]> audioq; /** * Listener for recognition results. */ RecognitionListener rl; /** * Whether to report partial results. */ boolean use_partials; /** * State of the main loop. */ enum State { IDLE, LISTENING }; /** * Events for main loop. */ enum Event { NONE, START, STOP, SHUTDOWN }; /** * Current event. */ Event mailbox; public RecognitionListener getRecognitionListener() { return rl; } public void setRecognitionListener(RecognitionListener rl) { this.rl = rl; } public void setUsePartials(boolean use_partials) { this.use_partials = use_partials; } public boolean getUsePartials() { return this.use_partials; } public RecognizerTask() { pocketsphinx .setLogfile("/sdcard/Android/data/zuoshu/pocketsphinx.log"); Config c = new Config(); /* * In 2.2 and above we can use getExternalFilesDir() or whatever it's * called */ c.setString("-hmm", "/sdcard/Android/data/test/hmm/tdt_sc_8k"); c.setString("-dict", "/sdcard/Android/data/test/lm/test.dic"); c.setString("-lm", "/sdcard/Android/data/test/lm/test.lm"); c.setFloat("-samprate", 8000.0); c.setInt("-maxhmmpf", 2000); c.setInt("-maxwpf", 10); c.setInt("-pl_window", 2); c.setBoolean("-backtrace", true); c.setBoolean("-bestpath", false); this.ps = new Decoder(c); this.audio = null; this.audioq = new LinkedBlockingQueue<short[]>(); this.use_partials = false; this.mailbox = Event.NONE; } public void run() { /* Main loop for this thread. */ boolean done = false; /* State of the main loop. */ State state = State.IDLE; /* Previous partial hypothesis. */ String partial_hyp = null; while (!done) { /* Read the mail. */ Event todo = Event.NONE; synchronized (this.mailbox) { todo = this.mailbox; /* If we're idle then wait for something to happen. */ if (state == State.IDLE && todo == Event.NONE) { try { Log.d(getClass().getName(), "waiting"); this.mailbox.wait(); todo = this.mailbox; Log.d(getClass().getName(), "got" + todo); } catch (InterruptedException e) { /* Quit main loop. */ Log.e(getClass().getName(), "Interrupted waiting for mailbox, shutting down"); todo = Event.SHUTDOWN; } } /* Reset the mailbox before releasing, to avoid race condition. */ this.mailbox = Event.NONE; } /* Do whatever the mail says to do. */ switch (todo) { case NONE: if (state == State.IDLE) Log.e(getClass().getName(), "Received NONE in mailbox when IDLE, threading error?"); break; case START: if (state == State.IDLE) { Log.d(getClass().getName(), "START"); this.audio = new AudioTask(this.audioq, 1024); this.audio_thread = new Thread(this.audio); this.ps.startUtt(); this.audio_thread.start(); state = State.LISTENING; } else Log.e(getClass().getName(), "Received START in mailbox when LISTENING"); break; case STOP: if (state == State.IDLE) Log.e(getClass().getName(), "Received STOP in mailbox when IDLE"); else { Log.d(getClass().getName(), "STOP"); assert this.audio != null; this.audio.stop(); try { this.audio_thread.join(); } catch (InterruptedException e) { Log.e(getClass().getName(), "Interrupted waiting for audio thread, shutting down"); done = true; } /* Drain the audio queue. */ short[] buf; while ((buf = this.audioq.poll()) != null) { Log.d(getClass().getName(), "Reading " + buf.length + " samples from queue"); this.ps.processRaw(buf, buf.length, false, false); } this.ps.endUtt(); this.audio = null; this.audio_thread = null; Hypothesis hyp = this.ps.getHyp(); if (this.rl != null) { if (hyp == null) { Log.d(getClass().getName(), "Recognition failure"); this.rl.onError(-1); } else { Bundle b = new Bundle(); Log.e(getClass().getName(), "zs log Final hypothesis: " + hyp.getHypstr()); Log.e(getClass().getName(), ps.getUttid()); b.putString("hyp", hyp.getHypstr()); this.rl.onResults(b); } } state = State.IDLE; } break; case SHUTDOWN: Log.d(getClass().getName(), "SHUTDOWN"); if (this.audio != null) { this.audio.stop(); assert this.audio_thread != null; try { this.audio_thread.join(); } catch (InterruptedException e) { /* We don't care! */ } } this.ps.endUtt(); this.audio = null; this.audio_thread = null; state = State.IDLE; done = true; break; } /* * Do whatever's appropriate for the current state. Actually this * just means processing audio if possible. */ if (state == State.LISTENING) { assert this.audio != null; try { short[] buf = this.audioq.take(); Log.d(getClass().getName(), "Reading " + buf.length + " samples from queue"); this.ps.processRaw(buf, buf.length, false, false); Hypothesis hyp = this.ps.getHyp(); if (hyp != null) { String hypstr = hyp.getHypstr(); if (hypstr != partial_hyp) { Log.d(ge