Port Pico to new TTS engine API

Requires TTS engine API added in
change I7614ff788e11f897e87052f684f1b4938d539fb7

The compatibility layer in

pico/compat/src/com/android/tts/compat/SynthProxy.java
pico/compat/jni/com_android_tts_compat_SynthProxy.cpp

is based on these files removed from the old TTS engine framework:

frameworks/base/packages/TtsService/src/android/tts/SynthProxy.java
frameworks/base/packages/TtsService/jni/android_tts_SynthProxy.cpp

Bug: 4150618
Change-Id: I7a2cca6b5cfbac6158a87fad69cc796140adb2f3

3 files changed, 1049 insertions, 0 deletions

diff --git a/pico/compat/jni/Android.mk b/pico/compat/jni/Android.mk
new file mode 100755
index 0000000..242047a
--- /dev/null
+++ b/pico/compat/jni/Android.mk
@@ -0,0 +1,30 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE:= libttscompat
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES:= \
+	android_tts_SynthProxy.cpp
+
+LOCAL_C_INCLUDES += \
+	frameworks/base/native/include \
+	$(JNI_H_INCLUDE)
+
+LOCAL_SHARED_LIBRARIES := \
+	libandroid_runtime \
+	libnativehelper \
+	libmedia \
+	libutils \
+	libcutils
+
+ifeq ($(TARGET_SIMULATOR),true)
+ LOCAL_LDLIBS += -ldl
+else
+ LOCAL_SHARED_LIBRARIES += libdl
+endif
+
+LOCAL_ARM_MODE := arm
+
+include $(BUILD_SHARED_LIBRARY)
+
diff --git a/pico/compat/jni/com_android_tts_compat_SynthProxy.cpp b/pico/compat/jni/com_android_tts_compat_SynthProxy.cpp
new file mode 100644
index 0000000..c9c38c4
--- /dev/null
+++ b/pico/compat/jni/com_android_tts_compat_SynthProxy.cpp
@@ -0,0 +1,706 @@
+/*
+ * Copyright (C) 2009-2010 Google Inc.
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define LOG_TAG "SynthProxyJNI"
+
+#include <utils/Log.h>
+#include <nativehelper/jni.h>
+#include <nativehelper/JNIHelp.h>
+#include <android_runtime/AndroidRuntime.h>
+#include <media/AudioTrack.h>
+#include <math.h>
+
+#include <dlfcn.h>
+
+#include "tts.h"
+
+#define DEFAULT_TTS_RATE        16000
+#define DEFAULT_TTS_BUFFERSIZE  2048
+
+// EQ + BOOST parameters
+#define FILTER_LOWSHELF_ATTENUATION -18.0f // in dB
+#define FILTER_TRANSITION_FREQ 1100.0f     // in Hz
+#define FILTER_SHELF_SLOPE 1.0f            // Q
+#define FILTER_GAIN 5.5f // linear gain
+
+// android.media.AudioFormat.ENCODING_ values
+#define AUDIO_FORMAT_ENCODING_DEFAULT 1
+#define AUDIO_FORMAT_ENCODING_PCM_16_BIT 2
+#define AUDIO_FORMAT_ENCODING_PCM_8_BIT 3
+
+using namespace android;
+
+// ----------------------------------------------------------------------------
+// EQ data
+static double m_fa, m_fb, m_fc, m_fd, m_fe;
+static double x0;  // x[n]
+static double x1;  // x[n-1]
+static double x2;  // x[n-2]
+static double out0;// y[n]
+static double out1;// y[n-1]
+static double out2;// y[n-2]
+
+static float fFilterLowshelfAttenuation = FILTER_LOWSHELF_ATTENUATION;
+static float fFilterTransitionFreq = FILTER_TRANSITION_FREQ;
+static float fFilterShelfSlope = FILTER_SHELF_SLOPE;
+static float fFilterGain = FILTER_GAIN;
+static bool  bUseFilter = false;
+
+void initializeEQ() {
+    double amp = float(pow(10.0, fFilterLowshelfAttenuation / 40.0));
+    double w = 2.0 * M_PI * (fFilterTransitionFreq / DEFAULT_TTS_RATE);
+    double sinw = float(sin(w));
+    double cosw = float(cos(w));
+    double beta = float(sqrt(amp)/fFilterShelfSlope);
+
+    // initialize low-shelf parameters
+    double b0 = amp * ((amp+1.0F) - ((amp-1.0F)*cosw) + (beta*sinw));
+    double b1 = 2.0F * amp * ((amp-1.0F) - ((amp+1.0F)*cosw));
+    double b2 = amp * ((amp+1.0F) - ((amp-1.0F)*cosw) - (beta*sinw));
+    double a0 = (amp+1.0F) + ((amp-1.0F)*cosw) + (beta*sinw);
+    double a1 = 2.0F * ((amp-1.0F) + ((amp+1.0F)*cosw));
+    double a2 = -((amp+1.0F) + ((amp-1.0F)*cosw) - (beta*sinw));
+
+    m_fa = fFilterGain * b0/a0;
+    m_fb = fFilterGain * b1/a0;
+    m_fc = fFilterGain * b2/a0;
+    m_fd = a1/a0;
+    m_fe = a2/a0;
+}
+
+void initializeFilter() {
+    x0 = 0.0f;
+    x1 = 0.0f;
+    x2 = 0.0f;
+    out0 = 0.0f;
+    out1 = 0.0f;
+    out2 = 0.0f;
+}
+
+void applyFilter(int16_t* buffer, size_t sampleCount) {
+
+    for (size_t i=0 ; i<sampleCount ; i++) {
+
+        x0 = (double) buffer[i];
+
+        out0 = (m_fa*x0) + (m_fb*x1) + (m_fc*x2) + (m_fd*out1) + (m_fe*out2);
+
+        x2 = x1;
+        x1 = x0;
+
+        out2 = out1;
+        out1 = out0;
+
+        if (out0 > 32767.0f) {
+            buffer[i] = 32767;
+        } else if (out0 < -32768.0f) {
+            buffer[i] = -32768;
+        } else {
+            buffer[i] = (int16_t) out0;
+        }
+    }
+}
+
+
+// ----------------------------------------------------------------------------
+
+static jmethodID synthesisRequest_start;
+static jmethodID synthesisRequest_audioAvailable;
+static jmethodID synthesisRequest_done;
+
+static Mutex engineMutex;
+
+
+
+typedef android_tts_engine_t *(*android_tts_entrypoint)();
+
+// ----------------------------------------------------------------------------
+class SynthProxyJniStorage {
+  public:
+    android_tts_engine_t *mEngine;
+    void *mEngineLibHandle;
+    int8_t *mBuffer;
+    size_t mBufferSize;
+
+    SynthProxyJniStorage() {
+        mEngine = NULL;
+        mEngineLibHandle = NULL;
+        mBufferSize = DEFAULT_TTS_BUFFERSIZE;
+        mBuffer = new int8_t[mBufferSize];
+        memset(mBuffer, 0, mBufferSize);
+    }
+
+    ~SynthProxyJniStorage() {
+        if (mEngine) {
+            mEngine->funcs->shutdown(mEngine);
+            mEngine = NULL;
+        }
+        if (mEngineLibHandle) {
+            int res = dlclose(mEngineLibHandle);
+            LOGE_IF( res != 0, "~SynthProxyJniStorage(): dlclose returned %d", res);
+        }
+        delete[] mBuffer;
+    }
+
+};
+
+// ----------------------------------------------------------------------------
+
+struct SynthRequestData {
+    SynthProxyJniStorage *jniStorage;
+    JNIEnv *env;
+    jobject request;
+    bool startCalled;
+};
+
+// ----------------------------------------------------------------------------
+
+/*
+ * Calls into Java
+ */
+
+static bool checkException(JNIEnv *env)
+{
+    jthrowable ex = env->ExceptionOccurred();
+    if (ex == NULL) {
+        return false;
+    }
+    env->ExceptionClear();
+    LOGE_EX(env, ex);
+    env->DeleteLocalRef(ex);
+    return true;
+}
+
+static int callRequestStart(JNIEnv *env, jobject request,
+        uint32_t rate, android_tts_audio_format_t format, int channelCount)
+{
+    int encoding;
+
+    switch (format) {
+    case ANDROID_TTS_AUDIO_FORMAT_DEFAULT:
+        encoding = AUDIO_FORMAT_ENCODING_DEFAULT;
+        break;
+    case ANDROID_TTS_AUDIO_FORMAT_PCM_8_BIT:
+        encoding = AUDIO_FORMAT_ENCODING_PCM_8_BIT;
+        break;
+    case ANDROID_TTS_AUDIO_FORMAT_PCM_16_BIT:
+        encoding = AUDIO_FORMAT_ENCODING_PCM_16_BIT;
+        break;
+    default:
+        LOGE("Can't play, bad format");
+        return ANDROID_TTS_FAILURE;
+    }
+
+    int result = env->CallIntMethod(request, synthesisRequest_start, rate, encoding, channelCount);
+    if (checkException(env)) {
+        return ANDROID_TTS_FAILURE;
+    }
+    return result;
+}
+
+static int callRequestAudioAvailable(JNIEnv *env, jobject request, int8_t *buffer,
+        int offset, int length)
+{
+    // TODO: Not nice to have to copy the buffer. Use ByteBuffer?
+    jbyteArray javaBuffer = env->NewByteArray(length);
+    if (javaBuffer == NULL) {
+        LOGE("Failed to allocate byte array");
+        return ANDROID_TTS_FAILURE;
+    }
+
+    env->SetByteArrayRegion(javaBuffer, 0, length, static_cast<jbyte *>(buffer + offset));
+    if (checkException(env)) {
+        env->DeleteLocalRef(javaBuffer);
+        return ANDROID_TTS_FAILURE;
+    }
+    int result = env->CallIntMethod(request, synthesisRequest_audioAvailable,
+            javaBuffer, offset, length);
+    if (checkException(env)) {
+        env->DeleteLocalRef(javaBuffer);
+        return ANDROID_TTS_FAILURE;
+    }
+    env->DeleteLocalRef(javaBuffer);
+    return result;
+}
+
+static int callRequestDone(JNIEnv *env, jobject request)
+{
+    int result = env->CallIntMethod(request, synthesisRequest_done);
+    if (checkException(env)) {
+        return ANDROID_TTS_FAILURE;
+    }
+    return result;
+}
+
+/*
+ * Callback from TTS engine.
+ */
+extern "C" android_tts_callback_status_t
+__ttsSynthDoneCB(void **pUserdata, uint32_t rate,
+               android_tts_audio_format_t format, int channelCount,
+               int8_t **pWav, size_t *pBufferSize,
+               android_tts_synth_status_t status)
+{
+    if (*pUserdata == NULL){
+        LOGE("userdata == NULL");
+        return ANDROID_TTS_CALLBACK_HALT;
+    }
+
+    SynthRequestData *pRequestData = static_cast<SynthRequestData*>(*pUserdata);
+    SynthProxyJniStorage *pJniData = pRequestData->jniStorage;
+    JNIEnv *env = pRequestData->env;
+
+    if (*pWav != NULL && *pBufferSize > 0) {
+        if (bUseFilter) {
+            applyFilter(reinterpret_cast<int16_t*>(*pWav), *pBufferSize/2);
+        }
+
+        if (!pRequestData->startCalled) {
+            // TODO: is encoding one of the AudioFormat.ENCODING_* constants?
+            pRequestData->startCalled = true;
+            if (callRequestStart(env, pRequestData->request, rate, format, channelCount)
+                    != ANDROID_TTS_SUCCESS) {
+                return ANDROID_TTS_CALLBACK_HALT;
+            }
+        }
+
+        if (callRequestAudioAvailable(env, pRequestData->request, *pWav, 0, *pBufferSize)
+                != ANDROID_TTS_SUCCESS) {
+            return ANDROID_TTS_CALLBACK_HALT;
+        }
+
+        memset(*pWav, 0, *pBufferSize);
+    }
+
+    if (pWav == NULL || status == ANDROID_TTS_SYNTH_DONE) {
+        callRequestDone(env, pRequestData->request);
+        env->DeleteGlobalRef(pRequestData->request);
+        delete pRequestData;
+        pRequestData = NULL;
+        return ANDROID_TTS_CALLBACK_HALT;
+    }
+
+    *pBufferSize = pJniData->mBufferSize;
+
+    return ANDROID_TTS_CALLBACK_CONTINUE;
+}
+
+
+// ----------------------------------------------------------------------------
+static int
+com_android_tts_compat_SynthProxy_setLowShelf(JNIEnv *env, jobject thiz, jboolean applyFilter,
+        jfloat filterGain, jfloat attenuationInDb, jfloat freqInHz, jfloat slope)
+{
+    bUseFilter = applyFilter;
+    if (applyFilter) {
+        fFilterLowshelfAttenuation = attenuationInDb;
+        fFilterTransitionFreq = freqInHz;
+        fFilterShelfSlope = slope;
+        fFilterGain = filterGain;
+
+        if (fFilterShelfSlope != 0.0f) {
+            initializeEQ();
+        } else {
+            LOGE("Invalid slope, can't be null");
+            return ANDROID_TTS_FAILURE;
+        }
+    }
+
+    return ANDROID_TTS_SUCCESS;
+}
+
+// ----------------------------------------------------------------------------
+static jint
+com_android_tts_compat_SynthProxy_native_setup(JNIEnv *env, jobject thiz,
+        jstring nativeSoLib, jstring engConfig)
+{
+    int result = 0;
+    bUseFilter = false;
+
+    const char *nativeSoLibNativeString =  env->GetStringUTFChars(nativeSoLib, 0);
+    const char *engConfigString = env->GetStringUTFChars(engConfig, 0);
+
+    void *engine_lib_handle = dlopen(nativeSoLibNativeString,
+            RTLD_NOW | RTLD_LOCAL);
+    if (engine_lib_handle == NULL) {
+        LOGE("com_android_tts_compat_SynthProxy_native_setup(): engine_lib_handle == NULL");
+    } else {
+        android_tts_entrypoint get_TtsEngine =
+            reinterpret_cast<android_tts_entrypoint>(dlsym(engine_lib_handle, "android_getTtsEngine"));
+
+        // Support obsolete/legacy binary modules
+        if (get_TtsEngine == NULL) {
+            get_TtsEngine =
+                reinterpret_cast<android_tts_entrypoint>(dlsym(engine_lib_handle, "getTtsEngine"));
+        }
+
+        android_tts_engine_t *engine = (*get_TtsEngine)();
+        if (engine) {
+            Mutex::Autolock l(engineMutex);
+            engine->funcs->init(engine, __ttsSynthDoneCB, engConfigString);
+
+            SynthProxyJniStorage *pSynthData = new SynthProxyJniStorage();
+            pSynthData->mEngine = engine;
+            pSynthData->mEngineLibHandle = engine_lib_handle;
+            result = reinterpret_cast<jint>(pSynthData);
+        }
+    }
+
+    env->ReleaseStringUTFChars(nativeSoLib, nativeSoLibNativeString);
+    env->ReleaseStringUTFChars(engConfig, engConfigString);
+
+    return result;
+}
+
+static SynthProxyJniStorage *getSynthData(jint jniData)
+{
+    if (jniData == 0) {
+        LOGE("Engine not initialized");
+        return NULL;
+    }
+    return reinterpret_cast<SynthProxyJniStorage *>(jniData);
+}
+
+static void
+com_android_tts_compat_SynthProxy_native_finalize(JNIEnv *env, jobject thiz, jint jniData)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return;
+    }
+
+    Mutex::Autolock l(engineMutex);
+
+    delete pSynthData;
+}
+
+static void
+com_android_tts_compat_SynthProxy_shutdown(JNIEnv *env, jobject thiz, jint jniData)
+{
+    com_android_tts_compat_SynthProxy_native_finalize(env, thiz, jniData);
+}
+
+static int
+com_android_tts_compat_SynthProxy_isLanguageAvailable(JNIEnv *env, jobject thiz, jint jniData,
+        jstring language, jstring country, jstring variant)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_LANG_NOT_SUPPORTED;
+    }
+
+    android_tts_engine_t *engine = pSynthData->mEngine;
+    if (!engine) {
+        return ANDROID_TTS_LANG_NOT_SUPPORTED;
+    }
+
+    const char *langNativeString = env->GetStringUTFChars(language, 0);
+    const char *countryNativeString = env->GetStringUTFChars(country, 0);
+    const char *variantNativeString = env->GetStringUTFChars(variant, 0);
+
+    int result = engine->funcs->isLanguageAvailable(engine, langNativeString,
+            countryNativeString, variantNativeString);
+
+    env->ReleaseStringUTFChars(language, langNativeString);
+    env->ReleaseStringUTFChars(country, countryNativeString);
+    env->ReleaseStringUTFChars(variant, variantNativeString);
+
+    return result;
+}
+
+static int
+com_android_tts_compat_SynthProxy_setLanguage(JNIEnv *env, jobject thiz, jint jniData,
+        jstring language, jstring country, jstring variant)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_LANG_NOT_SUPPORTED;
+    }
+
+    Mutex::Autolock l(engineMutex);
+
+    android_tts_engine_t *engine = pSynthData->mEngine;
+    if (!engine) {
+        return ANDROID_TTS_LANG_NOT_SUPPORTED;
+    }
+
+    const char *langNativeString = env->GetStringUTFChars(language, 0);
+    const char *countryNativeString = env->GetStringUTFChars(country, 0);
+    const char *variantNativeString = env->GetStringUTFChars(variant, 0);
+
+    int result = engine->funcs->setLanguage(engine, langNativeString,
+            countryNativeString, variantNativeString);
+
+    env->ReleaseStringUTFChars(language, langNativeString);
+    env->ReleaseStringUTFChars(country, countryNativeString);
+    env->ReleaseStringUTFChars(variant, variantNativeString);
+
+    return result;
+}
+
+
+static int
+com_android_tts_compat_SynthProxy_loadLanguage(JNIEnv *env, jobject thiz, jint jniData,
+        jstring language, jstring country, jstring variant)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_LANG_NOT_SUPPORTED;
+    }
+
+    android_tts_engine_t *engine = pSynthData->mEngine;
+    if (!engine) {
+        return ANDROID_TTS_LANG_NOT_SUPPORTED;
+    }
+
+    const char *langNativeString = env->GetStringUTFChars(language, 0);
+    const char *countryNativeString = env->GetStringUTFChars(country, 0);
+    const char *variantNativeString = env->GetStringUTFChars(variant, 0);
+
+    int result = engine->funcs->loadLanguage(engine, langNativeString,
+            countryNativeString, variantNativeString);
+
+    env->ReleaseStringUTFChars(language, langNativeString);
+    env->ReleaseStringUTFChars(country, countryNativeString);
+    env->ReleaseStringUTFChars(variant, variantNativeString);
+
+    return result;
+}
+
+static int
+com_android_tts_compat_SynthProxy_setProperty(JNIEnv *env, jobject thiz, jint jniData,
+        jstring name, jstring value)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    Mutex::Autolock l(engineMutex);
+
+    android_tts_engine_t *engine = pSynthData->mEngine;
+    if (!engine) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    const char *nameChars = env->GetStringUTFChars(name, 0);
+    const char *valueChars = env->GetStringUTFChars(value, 0);
+    size_t valueLength = env->GetStringUTFLength(value);
+
+    int result = engine->funcs->setProperty(engine, nameChars, valueChars, valueLength);
+
+    env->ReleaseStringUTFChars(name, nameChars);
+    env->ReleaseStringUTFChars(name, valueChars);
+
+    return result;
+}
+
+static int
+com_android_tts_compat_SynthProxy_speak(JNIEnv *env, jobject thiz, jint jniData,
+        jstring textJavaString, jobject request)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    initializeFilter();
+
+    Mutex::Autolock l(engineMutex);
+
+    android_tts_engine_t *engine = pSynthData->mEngine;
+    if (!engine) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    SynthRequestData *pRequestData = new SynthRequestData;
+    pRequestData->jniStorage = pSynthData;
+    pRequestData->env = env;
+    pRequestData->request = env->NewGlobalRef(request);
+    pRequestData->startCalled = false;
+
+    const char *textNativeString = env->GetStringUTFChars(textJavaString, 0);
+    memset(pSynthData->mBuffer, 0, pSynthData->mBufferSize);
+
+    int result = engine->funcs->synthesizeText(engine, textNativeString,
+            pSynthData->mBuffer, pSynthData->mBufferSize, static_cast<void *>(pRequestData));
+    env->ReleaseStringUTFChars(textJavaString, textNativeString);
+
+    return result;
+}
+
+static int
+com_android_tts_compat_SynthProxy_stop(JNIEnv *env, jobject thiz, jint jniData)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    android_tts_engine_t *engine = pSynthData->mEngine;
+    if (!engine) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    return engine->funcs->stop(engine);
+}
+
+static int
+com_android_tts_compat_SynthProxy_stopSync(JNIEnv *env, jobject thiz, jint jniData)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return ANDROID_TTS_FAILURE;
+    }
+
+    // perform a regular stop
+    int result = com_android_tts_compat_SynthProxy_stop(env, thiz, jniData);
+    // but wait on the engine having released the engine mutex which protects
+    // the synthesizer resources.
+    engineMutex.lock();
+    engineMutex.unlock();
+
+    return result;
+}
+
+static jobjectArray
+com_android_tts_compat_SynthProxy_getLanguage(JNIEnv *env, jobject thiz, jint jniData)
+{
+    SynthProxyJniStorage* pSynthData = getSynthData(jniData);
+    if (pSynthData == NULL) {
+        return NULL;
+    }
+
+    if (pSynthData->mEngine) {
+        size_t bufSize = 100;
+        char lang[bufSize];
+        char country[bufSize];
+        char variant[bufSize];
+        memset(lang, 0, bufSize);
+        memset(country, 0, bufSize);
+        memset(variant, 0, bufSize);
+        jobjectArray retLocale = (jobjectArray)env->NewObjectArray(3,
+                env->FindClass("java/lang/String"), env->NewStringUTF(""));
+
+        android_tts_engine_t *engine = pSynthData->mEngine;
+        engine->funcs->getLanguage(engine, lang, country, variant);
+        env->SetObjectArrayElement(retLocale, 0, env->NewStringUTF(lang));
+        env->SetObjectArrayElement(retLocale, 1, env->NewStringUTF(country));
+        env->SetObjectArrayElement(retLocale, 2, env->NewStringUTF(variant));
+        return retLocale;
+    } else {
+        return NULL;
+    }
+}
+
+
+// Dalvik VM type signatures
+static JNINativeMethod gMethods[] = {
+    {   "native_stop",
+        "(I)I",
+        (void*)com_android_tts_compat_SynthProxy_stop
+    },
+    {   "native_stopSync",
+        "(I)I",
+        (void*)com_android_tts_compat_SynthProxy_stopSync
+    },
+    {   "native_speak",
+        "(ILjava/lang/String;Landroid/speech/tts/SynthesisRequest;)I",
+        (void*)com_android_tts_compat_SynthProxy_speak
+    },
+    {   "native_isLanguageAvailable",
+        "(ILjava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
+        (void*)com_android_tts_compat_SynthProxy_isLanguageAvailable
+    },
+    {   "native_setLanguage",
+        "(ILjava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
+        (void*)com_android_tts_compat_SynthProxy_setLanguage
+    },
+    {   "native_loadLanguage",
+        "(ILjava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
+        (void*)com_android_tts_compat_SynthProxy_loadLanguage
+    },
+    {   "native_setProperty",
+        "(ILjava/lang/String;Ljava/lang/String;)I",
+        (void*)com_android_tts_compat_SynthProxy_setProperty
+    },
+    {   "native_getLanguage",
+        "(I)[Ljava/lang/String;",
+        (void*)com_android_tts_compat_SynthProxy_getLanguage
+    },
+    {   "native_shutdown",
+        "(I)V",
+        (void*)com_android_tts_compat_SynthProxy_shutdown
+    },
+    {   "native_setup",
+        "(Ljava/lang/String;Ljava/lang/String;)I",
+        (void*)com_android_tts_compat_SynthProxy_native_setup
+    },
+    {   "native_setLowShelf",
+        "(ZFFFF)I",
+        (void*)com_android_tts_compat_SynthProxy_setLowShelf
+    },
+    {   "native_finalize",
+        "(I)V",
+        (void*)com_android_tts_compat_SynthProxy_native_finalize
+    }
+};
+
+jint JNI_OnLoad(JavaVM* vm, void* reserved)
+{
+    JNIEnv* env = NULL;
+
+    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
+        LOGE("ERROR: GetEnv failed\n");
+        return -1;
+    }
+    assert(env != NULL);
+
+    jclass classSynthesisRequest = env->FindClass(
+            "android/speech/tts/SynthesisRequest");
+    if (classSynthesisRequest == NULL) {
+        return -1;
+    }
+
+    synthesisRequest_start = env->GetMethodID(classSynthesisRequest,
+            "start", "(III)I");
+    if (synthesisRequest_start == NULL) {
+        return -1;
+    }
+
+    synthesisRequest_audioAvailable = env->GetMethodID(classSynthesisRequest,
+            "audioAvailable", "([BII)I");
+    if (synthesisRequest_audioAvailable == NULL) {
+        return -1;
+    }
+
+    synthesisRequest_done = env->GetMethodID(classSynthesisRequest,
+            "done", "()I");
+    if (synthesisRequest_done == NULL) {
+        return -1;
+    }
+
+    if (jniRegisterNativeMethods(
+            env, "com/android/tts/compat/SynthProxy", gMethods, NELEM(gMethods)) < 0) {
+        return -1;
+    }
+
+    /* success -- return valid version number */
+    return JNI_VERSION_1_4;
+}
diff --git a/pico/compat/jni/tts.h b/pico/compat/jni/tts.h
new file mode 100644
index 0000000..fb15108
--- /dev/null
+++ b/pico/compat/jni/tts.h
@@ -0,0 +1,313 @@
+/*
+ * Copyright (C) 2009 Google Inc.
+ *
+ * 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.
+ */
+#ifndef ANDROID_TTS_H
+#define ANDROID_TTS_H 
+
+// This header defines the interface used by the Android platform
+// to access Text-To-Speech functionality in shared libraries that implement
+// speech synthesis and the management of resources associated with the
+// synthesis.
+
+// The shared library must contain a function named "android_getTtsEngine"
+// that returns an 'android_tts_engine_t' instance.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ANDROID_TTS_ENGINE_PROPERTY_CONFIG "engineConfig"
+#define ANDROID_TTS_ENGINE_PROPERTY_PITCH  "pitch"
+#define ANDROID_TTS_ENGINE_PROPERTY_RATE   "rate"
+#define ANDROID_TTS_ENGINE_PROPERTY_VOLUME "volume"
+
+typedef enum {
+    ANDROID_TTS_SUCCESS                 = 0,
+    ANDROID_TTS_FAILURE                 = -1,
+    ANDROID_TTS_FEATURE_UNSUPPORTED     = -2,
+    ANDROID_TTS_VALUE_INVALID           = -3,
+    ANDROID_TTS_PROPERTY_UNSUPPORTED    = -4,
+    ANDROID_TTS_PROPERTY_SIZE_TOO_SMALL = -5,
+    ANDROID_TTS_MISSING_RESOURCES       = -6
+} android_tts_result_t;
+
+typedef enum {
+    ANDROID_TTS_LANG_COUNTRY_VAR_AVAILABLE = 2,
+    ANDROID_TTS_LANG_COUNTRY_AVAILABLE    = 1,
+    ANDROID_TTS_LANG_AVAILABLE            = 0,
+    ANDROID_TTS_LANG_MISSING_DATA         = -1,
+    ANDROID_TTS_LANG_NOT_SUPPORTED        = -2
+} android_tts_support_result_t;
+
+typedef enum {
+    ANDROID_TTS_SYNTH_DONE              = 0,
+    ANDROID_TTS_SYNTH_PENDING           = 1
+} android_tts_synth_status_t;
+
+typedef enum {
+    ANDROID_TTS_CALLBACK_HALT           = 0,
+    ANDROID_TTS_CALLBACK_CONTINUE       = 1
+} android_tts_callback_status_t;
+
+// Supported audio formats
+typedef enum {
+    ANDROID_TTS_AUDIO_FORMAT_INVALID    = -1,
+    ANDROID_TTS_AUDIO_FORMAT_DEFAULT    = 0,
+    ANDROID_TTS_AUDIO_FORMAT_PCM_16_BIT = 1,
+    ANDROID_TTS_AUDIO_FORMAT_PCM_8_BIT  = 2,
+} android_tts_audio_format_t;
+
+
+/* An android_tts_engine_t object can be anything, but must have,
+ * as its first field, a pointer to a table of functions.
+ *
+ * See the full definition of struct android_tts_engine_t_funcs_t
+ * below for details.
+ */
+typedef struct android_tts_engine_funcs_t  android_tts_engine_funcs_t;
+
+typedef struct {
+    android_tts_engine_funcs_t *funcs;
+} android_tts_engine_t;
+
+/* This function must be located in the TTS Engine shared library
+ * and must return the address of an android_tts_engine_t library.
+ */
+extern android_tts_engine_t *android_getTtsEngine();
+
+/* Including the old version for legacy support (Froyo compatibility).
+ * This should return the same thing as android_getTtsEngine.
+ */
+extern "C" android_tts_engine_t *getTtsEngine();
+
+// A callback type used to notify the framework of new synthetized
+// audio samples, status will be SYNTH_DONE for the last sample of
+// the last request, of SYNTH_PENDING otherwise.
+//
+// This is passed by the framework to the engine through the
+// 'engine_init' function (see below).
+//
+// The callback for synthesis completed takes:
+// @param [inout] void *&       - The userdata pointer set in the original
+//                                 synth call
+// @param [in]    uint32_t      - Track sampling rate in Hz
+// @param [in]    uint32_t      - The audio format
+// @param [in]    int           - The number of channels
+// @param [inout] int8_t *&     - A buffer of audio data only valid during the
+//                                execution of the callback
+// @param [inout] size_t  &     - The size of the buffer
+// @param [in] tts_synth_status - indicate whether the synthesis is done, or
+//                                 if more data is to be synthesized.
+// @return TTS_CALLBACK_HALT to indicate the synthesis must stop,
+//         TTS_CALLBACK_CONTINUE to indicate the synthesis must continue if
+//            there is more data to produce.
+typedef android_tts_callback_status_t (*android_tts_synth_cb_t)
+            (void **pUserData,
+             uint32_t trackSamplingHz,
+             android_tts_audio_format_t audioFormat,
+             int channelCount,
+             int8_t **pAudioBuffer,
+             size_t *pBufferSize,
+             android_tts_synth_status_t status);
+
+
+// The table of function pointers that the android_tts_engine_t must point to.
+// Note that each of these functions will take a handle to the engine itself
+// as their first parameter.
+//
+
+struct android_tts_engine_funcs_t {
+    // reserved fields, ignored by the framework
+    // they must be placed here to ensure binary compatibility
+    // of legacy binary plugins.
+    void *reserved[2];
+
+    // Initialize the TTS engine and returns whether initialization succeeded.
+    // @param synthDoneCBPtr synthesis callback function pointer
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*init)
+            (void *engine,
+             android_tts_synth_cb_t synthDonePtr,
+             const char *engineConfig);
+
+    // Shut down the TTS engine and releases all associated resources.
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*shutdown)
+            (void *engine);
+
+    // Interrupt synthesis and flushes any synthesized data that hasn't been
+    // output yet. This will block until callbacks underway are completed.
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*stop)
+            (void *engine);
+
+    // Returns the level of support for the language, country and variant.
+    // @return TTS_LANG_COUNTRY_VAR_AVAILABLE if the language, country and variant are supported,
+    //            and the corresponding resources are correctly installed
+    //         TTS_LANG_COUNTRY_AVAILABLE if the language and country are supported and the
+    //             corresponding resources are correctly installed, but there is no match for
+    //             the specified variant
+    //         TTS_LANG_AVAILABLE if the language is supported and the
+    //             corresponding resources are correctly installed, but there is no match for
+    //             the specified country and variant
+    //         TTS_LANG_MISSING_DATA if the required resources to provide any level of support
+    //             for the language are not correctly installed
+    //         TTS_LANG_NOT_SUPPORTED if the language is not supported by the TTS engine.
+    android_tts_support_result_t (*isLanguageAvailable)
+            (void *engine,
+             const char *lang,
+             const char *country,
+             const char *variant);
+
+    // Load the resources associated with the specified language. The loaded
+    // language will only be used once a call to setLanguage() with the same
+    // language value is issued. Language and country values are coded according to the ISO three
+    // letter codes for languages and countries, as can be retrieved from a java.util.Locale
+    // instance. The variant value is encoded as the variant string retrieved from a
+    // java.util.Locale instance built with that variant data.
+    // @param lang pointer to the ISO three letter code for the language
+    // @param country pointer to the ISO three letter code for the country
+    // @param variant pointer to the variant code
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*loadLanguage)
+            (void *engine,
+             const char *lang,
+             const char *country,
+             const char *variant);
+
+    // Load the resources associated with the specified language, country and Locale variant.
+    // The loaded language will only be used once a call to setLanguageFromLocale() with the same
+    // language value is issued. Language and country values are coded according to the ISO three
+    // letter codes for languages and countries, as can be retrieved from a java.util.Locale
+    // instance. The variant value is encoded as the variant string retrieved from a
+    // java.util.Locale instance built with that variant data.
+    // @param lang pointer to the ISO three letter code for the language
+    // @param country pointer to the ISO three letter code for the country
+    // @param variant pointer to the variant code
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*setLanguage)
+            (void *engine,
+             const char *lang,
+             const char *country,
+             const char *variant);
+
+    // Retrieve the currently set language, country and variant, or empty strings if none of
+    // parameters have been set. Language and country are represented by their 3-letter ISO code
+    // @param[out]   pointer to the retrieved 3-letter code language value
+    // @param[out]   pointer to the retrieved 3-letter code country value
+    // @param[out]   pointer to the retrieved variant value
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*getLanguage)
+            (void *engine,
+             char *language,
+             char *country,
+             char *variant);
+
+    // Notifies the engine what audio parameters should be used for the synthesis.
+    // This is meant to be used as a hint, the engine implementation will set the output values
+    // to those of the synthesis format, based on a given hint.
+    // @param[inout] encoding in: the desired audio sample format
+    //                         out: the format used by the TTS engine
+    // @param[inout] rate in: the desired audio sample rate
+    //                         out: the sample rate used by the TTS engine
+    // @param[inout] channels in: the desired number of audio channels
+    //                         out: the number of channels used by the TTS engine
+    // @return TTS_SUCCESS, or TTS_FAILURE
+    android_tts_result_t (*setAudioFormat)
+            (void *engine,
+             android_tts_audio_format_t* pEncoding,
+             uint32_t* pRate,
+             int* pChannels);
+
+    // Set a property for the the TTS engine
+    // "size" is the maximum size of "value" for properties "property"
+    // @param property pointer to the property name
+    // @param value    pointer to the property value
+    // @param size     maximum size required to store this type of property
+    // @return         TTS_PROPERTY_UNSUPPORTED, or TTS_SUCCESS, or TTS_FAILURE,
+    //                  or TTS_VALUE_INVALID
+    android_tts_result_t (*setProperty)
+            (void *engine,
+             const char *property,
+             const char *value,
+             const size_t size);
+
+    // Retrieve a property from the TTS engine
+    // @param        property pointer to the property name
+    // @param[out]   value    pointer to the retrieved language value
+    // @param[inout] iosize   in: stores the size available to store the
+    //                          property value.
+    //                        out: stores the size required to hold the language
+    //                          value if getLanguage() returned
+    //                          TTS_PROPERTY_SIZE_TOO_SMALL, unchanged otherwise
+    // @return TTS_PROPERTY_UNSUPPORTED, or TTS_SUCCESS,
+    //         or TTS_PROPERTY_SIZE_TOO_SMALL
+    android_tts_result_t (*getProperty)
+            (void *engine,
+             const char *property,
+             char *value,
+             size_t *iosize);
+
+    // Synthesize the text.
+    // As the synthesis is performed, the engine invokes the callback to notify
+    // the TTS framework that it has filled the given buffer, and indicates how
+    // many bytes it wrote. The callback is called repeatedly until the engine
+    // has generated all the audio data corresponding to the text.
+    // Note about the format of the input: the text parameter may use the
+    // following elements
+    // and their respective attributes as defined in the SSML 1.0 specification:
+    //    * lang
+    //    * say-as:
+    //          o interpret-as
+    //    * phoneme
+    //    * voice:
+    //          o gender,
+    //          o age,
+    //          o variant,
+    //          o name
+    //    * emphasis
+    //    * break:
+    //          o strength,
+    //          o time
+    //    * prosody:
+    //          o pitch,
+    //          o contour,
+    //          o range,
+    //          o rate,
+    //          o duration,
+    //          o volume
+    //    * mark
+    // Differences between this text format and SSML are:
+    //    * full SSML documents are not supported
+    //    * namespaces are not supported
+    // Text is coded in UTF-8.
+    // @param text      the UTF-8 text to synthesize
+    // @param userdata  pointer to be returned when the call is invoked
+    // @param buffer    the location where the synthesized data must be written
+    // @param bufferSize the number of bytes that can be written in buffer
+    // @return          TTS_SUCCESS or TTS_FAILURE
+    android_tts_result_t (*synthesizeText)
+            (void *engine,
+             const char *text,
+             int8_t *buffer,
+             size_t bufferSize,
+             void *userdata);
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ANDROID_TTS_H */