1 files changed, 183 insertions, 0 deletions
diff --git a/pico/compat/src/com/android/tts/compat/SynthProxy.java b/pico/compat/src/com/android/tts/compat/SynthProxy.java
new file mode 100755
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--- /dev/null
+++ b/pico/compat/src/com/android/tts/compat/SynthProxy.java
@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.android.tts.compat;
+
+import android.speech.tts.SynthesisRequest;
+import android.util.Log;
+
+/**
+ * The SpeechSynthesis class provides a high-level api to create and play
+ * synthesized speech. This class is used internally to talk to a native
+ * TTS library that implements the interface defined in
+ * frameworks/base/include/tts/TtsEngine.h
+ *
+ */
+public class SynthProxy {
+
+    static {
+        System.loadLibrary("ttscompat");
+    }
+
+    private final static String TAG = "SynthProxy";
+
+    // Default parameters of a filter to be applied when using the Pico engine.
+    // Such a huge filter gain is justified by how much energy in the low frequencies is "wasted" at
+    // the output of the synthesis. The low shelving filter removes it, leaving room for
+    // amplification.
+    private final static float PICO_FILTER_GAIN = 5.0f; // linear gain
+    private final static float PICO_FILTER_LOWSHELF_ATTENUATION = -18.0f; // in dB
+    private final static float PICO_FILTER_TRANSITION_FREQ = 1100.0f;     // in Hz
+    private final static float PICO_FILTER_SHELF_SLOPE = 1.0f;            // Q
+
+    private int mJniData = 0;
+
+    /**
+     * Constructor; pass the location of the native TTS .so to use.
+     */
+    public SynthProxy(String nativeSoLib, String engineConfig) {
+        boolean applyFilter = shouldApplyAudioFilter(nativeSoLib);
+        Log.v(TAG, "About to load "+ nativeSoLib + ", applyFilter=" + applyFilter);
+        mJniData = native_setup(nativeSoLib, engineConfig);
+        if (mJniData == 0) {
+            throw new RuntimeException("Failed to load " + nativeSoLib);
+        }
+        native_setLowShelf(applyFilter, PICO_FILTER_GAIN, PICO_FILTER_LOWSHELF_ATTENUATION,
+                PICO_FILTER_TRANSITION_FREQ, PICO_FILTER_SHELF_SLOPE);
+    }
+
+    // HACK: Apply audio filter if the engine is pico
+    private boolean shouldApplyAudioFilter(String nativeSoLib) {
+        return nativeSoLib.toLowerCase().contains("pico");
+    }
+
+    /**
+     * Stops and clears the AudioTrack.
+     */
+    public int stop() {
+        return native_stop(mJniData);
+    }
+
+    /**
+     * Synchronous stop of the synthesizer. This method returns when the synth
+     * has completed the stop procedure and doesn't use any of the resources it
+     * was using while synthesizing.
+     *
+     * @return {@link android.speech.tts.TextToSpeech#SUCCESS} or
+     *         {@link android.speech.tts.TextToSpeech#ERROR}
+     */
+    public int stopSync() {
+        return native_stopSync(mJniData);
+    }
+
+    public int speak(SynthesisRequest request) {
+        return native_speak(mJniData, request.getText(), request);
+    }
+
+    /**
+     * Queries for language support.
+     * Return codes are defined in android.speech.tts.TextToSpeech
+     */
+    public int isLanguageAvailable(String language, String country, String variant) {
+        return native_isLanguageAvailable(mJniData, language, country, variant);
+    }
+
+    /**
+     * Updates the engine configuration.
+     */
+    public int setConfig(String engineConfig) {
+        return native_setProperty(mJniData, "engineConfig", engineConfig);
+    }
+
+    /**
+     * Sets the language.
+     */
+    public int setLanguage(String language, String country, String variant) {
+        return native_setLanguage(mJniData, language, country, variant);
+    }
+
+    /**
+     * Loads the language: it's not set, but prepared for use later.
+     */
+    public int loadLanguage(String language, String country, String variant) {
+        return native_loadLanguage(mJniData, language, country, variant);
+    }
+
+    /**
+     * Sets the speech rate.
+     */
+    public final int setSpeechRate(int speechRate) {
+        return native_setProperty(mJniData, "rate", String.valueOf(speechRate));
+    }
+
+    /**
+     * Sets the pitch of the synthesized voice.
+     */
+    public final int setPitch(int pitch) {
+        return native_setProperty(mJniData, "pitch", String.valueOf(pitch));
+    }
+
+    /**
+     * Returns the currently set language, country and variant information.
+     */
+    public String[] getLanguage() {
+        return native_getLanguage(mJniData);
+    }
+
+    /**
+     * Shuts down the native synthesizer.
+     */
+    public void shutdown()  {
+        native_shutdown(mJniData);
+    }
+
+    @Override
+    protected void finalize() {
+        if (mJniData != 0) {
+            Log.w(TAG, "SynthProxy finalized without being shutdown");
+            native_finalize(mJniData);
+            mJniData = 0;
+        }
+    }
+
+    private native final int native_setup(String nativeSoLib, String engineConfig);
+
+    private native final int native_setLowShelf(boolean applyFilter, float filterGain,
+            float attenuationInDb, float freqInHz, float slope);
+
+    private native final void native_finalize(int jniData);
+
+    private native final int native_stop(int jniData);
+
+    private native final int native_stopSync(int jniData);
+
+    private native final int native_speak(int jniData, String text, SynthesisRequest request);
+
+    private native final int  native_isLanguageAvailable(int jniData, String language,
+            String country, String variant);
+
+    private native final int native_setLanguage(int jniData, String language, String country,
+            String variant);
+
+    private native final int native_loadLanguage(int jniData, String language, String country,
+            String variant);
+
+    private native final int native_setProperty(int jniData, String name, String value);
+
+    private native final String[] native_getLanguage(int jniData);
+
+    private native final void native_shutdown(int jniData);
+
+}